Extract .nu-env tests and more granularity (#3078 )

The autoenv logic mutates environment variables in the running session as it operates and decides what to do for trusted directories containing `.nu-env` files. Few of the ways to interact with it were all in a single test function. We separate out all the ways that were done in the single test function to document it better. This will greatly help once we start refactoring our way out from setting environment variables this way to just setting them to `Scope`. This is part of an on-going effort to keep variables (`PATH` and `ENV`) in our `Scope` and rely on it for everything related to variables. We expect to move away from setting (`std::*`) envrironment variables in the current running process. This is non-trivial since we need to handle cases from vars coming in from the outside world, prioritize, and also compare to the ones we have both stored in memory and in configuration files. Also to send out our in-memory (in `Scope`) variables properly to external programs once we no longer rely on `std::env` vars from the running process.
Bump to 0.27.1 (#3073 )
2021-02-18 20:24:27 -05:00 · 2021-02-18 18:54:48 +13:00 · 2021-02-18 15:56:14 +13:00 · 2021-02-17 09:02:13 +13:00 · 2021-02-17 04:47:47 +13:00 · 2021-02-16 19:20:05 +13:00
593 changed files with 17643 additions and 12771 deletions
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@ -12,9 +12,9 @@ A clear and concise description of what the bug is.

 **To Reproduce**
 Steps to reproduce the behavior:
-1. 
-2. 
-3. 
+1.
+2.
+3.

 **Expected behavior**
 A clear and concise description of what you expected to happen.
@ -23,8 +23,25 @@ A clear and concise description of what you expected to happen.
 If applicable, add screenshots to help explain your problem.

 **Configuration (please complete the following information):**
- - OS (e.g. Windows):
- - Nu version (you can use the `version` command to find out): 
- - Optional features (if any):

-Add any other context about the problem here.
+Run `version | pivot` and paste the output to show OS, features, etc.
+
+```
+> version | pivot
+╭───┬────────────────────┬───────────────────────────────────────────────────────────────────────╮
+│ # │ Column0            │ Column1                                                               │
+├───┼────────────────────┼───────────────────────────────────────────────────────────────────────┤
+│ 0 │ version            │ 0.24.1                                                                │
+│ 1 │ build_os           │ macos-x86_64                                                          │
+│ 2 │ rust_version       │ rustc 1.48.0                                                          │
+│ 3 │ cargo_version      │ cargo 1.48.0                                                          │
+│ 4 │ pkg_version        │ 0.24.1                                                                │
+│ 5 │ build_time         │ 2020-12-18 09:54:09                                                   │
+│ 6 │ build_rust_channel │ release                                                               │
+│ 7 │ features           │ ctrlc, default, directories, dirs, git, ichwh, ptree, rich-benchmark, │
+│   │                    │ rustyline, term, uuid, which, zip                                     │
+╰───┴────────────────────┴───────────────────────────────────────────────────────────────────────╯
+```
+
+
+**Add any other context about the problem here.**
--- a/.gitpod.Dockerfile
+++ b/.gitpod.Dockerfile
@ -1,5 +1,9 @@
 FROM gitpod/workspace-full

+# Gitpod will not rebuild Nushell's dev image unless *some* change is made to this Dockerfile.
+# To force a rebuild, simply increase this counter:
+ENV TRIGGER_REBUILD 1
+
 USER gitpod

 RUN sudo apt-get update && \
@ -11,4 +15,4 @@ RUN sudo apt-get update && \
        rust-lldb \
    && sudo rm -rf /var/lib/apt/lists/*

-ENV RUST_LLDB=/usr/bin/lldb-8
+ENV RUST_LLDB=/usr/bin/lldb-11
--- a/.gitpod.yml
+++ b/.gitpod.yml
@ -4,7 +4,7 @@ tasks:
  - name: Clippy
    init: cargo clippy --all --features=stable -- -D clippy::result_unwrap_used -D clippy::option_unwrap_used
  - name: Testing
-    init: cargo test --all --features=stable,test-bins
+    init: cargo test --all --features=stable
  - name: Build
    init: cargo build --features=stable
  - name: Nu
--- a/Cargo.lock
+++ b/Cargo.lock
--- a/Cargo.toml
+++ b/Cargo.toml
@ -10,7 +10,7 @@ license = "MIT"
 name = "nu"
 readme = "README.md"
 repository = "https://github.com/nushell/nushell"
-version = "0.23.0"
+version = "0.27.1"

 [workspace]
 members = ["crates/*/"]
@ -18,82 +18,110 @@ members = ["crates/*/"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

 [dependencies]
-nu-cli = {version = "0.23.0", path = "./crates/nu-cli"}
-nu-data = {version = "0.23.0", path = "./crates/nu-data"}
-nu-errors = {version = "0.23.0", path = "./crates/nu-errors"}
-nu-parser = {version = "0.23.0", path = "./crates/nu-parser"}
-nu-plugin = {version = "0.23.0", path = "./crates/nu-plugin"}
-nu-protocol = {version = "0.23.0", path = "./crates/nu-protocol"}
-nu-source = {version = "0.23.0", path = "./crates/nu-source"}
-nu-value-ext = {version = "0.23.0", path = "./crates/nu-value-ext"}
+nu-cli = { version = "0.27.1", path = "./crates/nu-cli", default-features = false }
+nu-command = { version = "0.27.1", path = "./crates/nu-command" }
+nu-data = { version = "0.27.1", path = "./crates/nu-data" }
+nu-engine = { version = "0.27.1", path = "./crates/nu-engine" }
+nu-errors = { version = "0.27.1", path = "./crates/nu-errors" }
+nu-parser = { version = "0.27.1", path = "./crates/nu-parser" }
+nu-plugin = { version = "0.27.1", path = "./crates/nu-plugin" }
+nu-protocol = { version = "0.27.1", path = "./crates/nu-protocol" }
+nu-source = { version = "0.27.1", path = "./crates/nu-source" }
+nu-value-ext = { version = "0.27.1", path = "./crates/nu-value-ext" }

-nu_plugin_binaryview = {version = "0.23.0", path = "./crates/nu_plugin_binaryview", optional = true}
-nu_plugin_chart = {version = "0.23.0", path = "./crates/nu_plugin_chart", optional = true}
-nu_plugin_fetch = {version = "0.23.0", path = "./crates/nu_plugin_fetch", optional = true}
-nu_plugin_from_bson = {version = "0.23.0", path = "./crates/nu_plugin_from_bson", optional = true}
-nu_plugin_from_sqlite = {version = "0.23.0", path = "./crates/nu_plugin_from_sqlite", optional = true}
-nu_plugin_inc = {version = "0.23.0", path = "./crates/nu_plugin_inc", optional = true}
-nu_plugin_match = {version = "0.23.0", path = "./crates/nu_plugin_match", optional = true}
-nu_plugin_post = {version = "0.23.0", path = "./crates/nu_plugin_post", optional = true}
-nu_plugin_ps = {version = "0.23.0", path = "./crates/nu_plugin_ps", optional = true}
-nu_plugin_s3 = {version = "0.23.0", path = "./crates/nu_plugin_s3", optional = true}
-nu_plugin_start = {version = "0.23.0", path = "./crates/nu_plugin_start", optional = true}
-nu_plugin_sys = {version = "0.23.0", path = "./crates/nu_plugin_sys", optional = true}
-nu_plugin_textview = {version = "0.23.0", path = "./crates/nu_plugin_textview", optional = true}
-nu_plugin_to_bson = {version = "0.23.0", path = "./crates/nu_plugin_to_bson", optional = true}
-nu_plugin_to_sqlite = {version = "0.23.0", path = "./crates/nu_plugin_to_sqlite", optional = true}
-nu_plugin_tree = {version = "0.23.0", path = "./crates/nu_plugin_tree", optional = true}
-nu_plugin_xpath = {version = "0.23.0", path = "./crates/nu_plugin_xpath", optional = true}
-nu_plugin_selector = {version = "0.23.0", path = "./crates/nu_plugin_selector", optional = true}
+nu_plugin_binaryview = { version = "0.27.1", path = "./crates/nu_plugin_binaryview", optional = true }
+nu_plugin_chart = { version = "0.27.1", path = "./crates/nu_plugin_chart", optional = true }
+nu_plugin_fetch = { version = "0.27.1", path = "./crates/nu_plugin_fetch", optional = true }
+nu_plugin_from_bson = { version = "0.27.1", path = "./crates/nu_plugin_from_bson", optional = true }
+nu_plugin_from_sqlite = { version = "0.27.1", path = "./crates/nu_plugin_from_sqlite", optional = true }
+nu_plugin_inc = { version = "0.27.1", path = "./crates/nu_plugin_inc", optional = true }
+nu_plugin_match = { version = "0.27.1", path = "./crates/nu_plugin_match", optional = true }
+nu_plugin_post = { version = "0.27.1", path = "./crates/nu_plugin_post", optional = true }
+nu_plugin_ps = { version = "0.27.1", path = "./crates/nu_plugin_ps", optional = true }
+nu_plugin_s3 = { version = "0.27.1", path = "./crates/nu_plugin_s3", optional = true }
+nu_plugin_selector = { version = "0.27.1", path = "./crates/nu_plugin_selector", optional = true }
+nu_plugin_start = { version = "0.27.1", path = "./crates/nu_plugin_start", optional = true }
+nu_plugin_sys = { version = "0.27.1", path = "./crates/nu_plugin_sys", optional = true }
+nu_plugin_textview = { version = "0.27.1", path = "./crates/nu_plugin_textview", optional = true }
+nu_plugin_to_bson = { version = "0.27.1", path = "./crates/nu_plugin_to_bson", optional = true }
+nu_plugin_to_sqlite = { version = "0.27.1", path = "./crates/nu_plugin_to_sqlite", optional = true }
+nu_plugin_tree = { version = "0.27.1", path = "./crates/nu_plugin_tree", optional = true }
+nu_plugin_xpath = { version = "0.27.1", path = "./crates/nu_plugin_xpath", optional = true }

 # Required to bootstrap the main binary
 clap = "2.33.3"
-ctrlc = {version = "3.1.6", optional = true}
-futures = {version = "0.3.5", features = ["compat", "io-compat"]}
-log = "0.4.11"
+ctrlc = { version = "3.1.7", optional = true }
+futures = { version = "0.3.12", features = ["compat", "io-compat"] }
+itertools = "0.10.0"
+log = "0.4.14"
 pretty_env_logger = "0.4.0"
-itertools = "0.9.0"

 [dev-dependencies]
+nu-test-support = { version = "0.27.1", path = "./crates/nu-test-support" }
 dunce = "1.0.1"
-nu-test-support = {version = "0.23.0", path = "./crates/nu-test-support"}
+serial_test = "0.5.1"
+

 [build-dependencies]

 [features]
-ctrlc-support = ["nu-cli/ctrlc"]
-directories-support = ["nu-cli/directories", "nu-cli/dirs", "nu-data/directories", "nu-data/dirs"]
-git-support = ["nu-cli/git2"]
-ptree-support = ["nu-cli/ptree"]
-rich-benchmark = ["nu-cli/rich-benchmark"]
-rustyline-support = ["nu-cli/rustyline-support"]
-term-support = ["nu-cli/term"]
-uuid-support = ["nu-cli/uuid_crate"]
-which-support = ["nu-cli/ichwh", "nu-cli/which"]
+ctrlc-support = ["nu-cli/ctrlc", "nu-command/ctrlc"]
+directories-support = [
+    "nu-cli/directories",
+    "nu-cli/dirs",
+    "nu-command/directories",
+    "nu-command/dirs",
+    "nu-data/directories",
+    "nu-data/dirs",
+    "nu-engine/dirs",
+]
+ptree-support = ["nu-cli/ptree", "nu-command/ptree"]
+rustyline-support = ["nu-cli/rustyline-support", "nu-command/rustyline-support"]
+term-support = ["nu-cli/term", "nu-command/term"]
+uuid-support = ["nu-cli/uuid_crate", "nu-command/uuid_crate"]
+which-support = [
+    "nu-cli/ichwh",
+    "nu-cli/which",
+    "nu-command/ichwh",
+    "nu-command/which",
+]

 default = [
-  "sys",
-  "ps",
-  "textview",
-  "inc",
-  "git-support",
-  "directories-support",
-  "ctrlc-support",
-  "which-support",
-  "ptree-support",
-  "term-support",
-  "uuid-support",
-  "rustyline-support",
-  "match",
-  "post",
-  "fetch",
-  "rich-benchmark",
-  "zip-support"
+    "nu-cli/shadow-rs",
+    "sys",
+    "ps",
+    "textview",
+    "inc",
+    "directories-support",
+    "ctrlc-support",
+    "which-support",
+    "ptree-support",
+    "term-support",
+    "uuid-support",
+    "rustyline-support",
+    "match",
+    "post",
+    "fetch",
+    "zip-support",
 ]
-extra = ["default", "binaryview", "tree", "clipboard-cli", "trash-support", "start", "bson", "sqlite", "s3", "chart", "xpath", "selector"]
-stable = ["default"]

-wasi = ["inc", "match", "directories-support", "ptree-support", "match", "tree", "rustyline-support"]
+stable = ["default"]
+extra = [
+    "default",
+    "binaryview",
+    "tree",
+    "clipboard-cli",
+    "trash-support",
+    "start",
+    "bson",
+    "sqlite",
+    "s3",
+    "chart",
+    "xpath",
+    "selector",
+]
+
+wasi = ["inc", "match", "ptree-support", "match", "tree", "rustyline-support"]

 trace = ["nu-parser/trace"]

@ -105,26 +133,26 @@ post = ["nu_plugin_post"]
 ps = ["nu_plugin_ps"]
 sys = ["nu_plugin_sys"]
 textview = ["nu_plugin_textview"]
-zip-support = ["nu-cli/zip"]
+zip-support = ["nu-cli/zip", "nu-command/zip"]

 # Extra
 binaryview = ["nu_plugin_binaryview"]
 bson = ["nu_plugin_from_bson", "nu_plugin_to_bson"]
 chart = ["nu_plugin_chart"]
-clipboard-cli = ["nu-cli/clipboard-cli"]
+clipboard-cli = ["nu-cli/clipboard-cli", "nu-command/clipboard-cli"]
 s3 = ["nu_plugin_s3"]
+selector = ["nu_plugin_selector"]
 sqlite = ["nu_plugin_from_sqlite", "nu_plugin_to_sqlite"]
 start = ["nu_plugin_start"]
-trash-support = ["nu-cli/trash-support"]
+trash-support = ["nu-cli/trash-support", "nu-command/trash-support"]
 tree = ["nu_plugin_tree"]
 xpath = ["nu_plugin_xpath"]
-selector = ["nu_plugin_selector"]

 [profile.release]
 #strip = "symbols" #Couldn't get working +nightly
-opt-level = 'z' #Optimize for size
-lto = true #Link Time Optimization
 codegen-units = 1 #Reduce parallel codegen units
+lto = true #Link Time Optimization
+opt-level = 'z' #Optimize for size

 # Core plugins that ship with `cargo install nu` by default
 # Currently, Cargo limits us to installing only one binary
--- a/README.md
+++ b/README.md
@ -11,7 +11,7 @@

 A new type of shell.

-![Example of nushell](images/nushell-autocomplete.gif "Example of nushell")
+![Example of nushell](images/nushell-autocomplete5.gif "Example of nushell")

 ## Status

@ -44,19 +44,19 @@ Try it in Gitpod.

 ### Local

-Up-to-date installation instructions can be found in the [installation chapter of the book](https://www.nushell.sh/book/installation.html).  **Windows users**: please note that Nu works on Windows 10 and does not currently have Windows 7/8.1 support.
+Up-to-date installation instructions can be found in the [installation chapter of the book](https://www.nushell.sh/book/installation.html). **Windows users**: please note that Nu works on Windows 10 and does not currently have Windows 7/8.1 support.

 To build Nu, you will need to use the **latest stable (1.47 or later)** version of the compiler.

 Required dependencies:

-* pkg-config and libssl (only needed on Linux)
-  * On Debian/Ubuntu: `apt install pkg-config libssl-dev`
+-   pkg-config and libssl (only needed on Linux)
+    -   On Debian/Ubuntu: `apt install pkg-config libssl-dev`

 Optional dependencies:

-* To use Nu with all possible optional features enabled, you'll also need the following:
-  * On Linux (on Debian/Ubuntu): `apt install libxcb-composite0-dev libx11-dev`
+-   To use Nu with all possible optional features enabled, you'll also need the following:
+    -   On Linux (on Debian/Ubuntu): `apt install libxcb-composite0-dev libx11-dev`

 To install Nu via cargo (make sure you have installed [rustup](https://rustup.rs/) and the latest stable compiler via `rustup install stable`):

@ -64,7 +64,7 @@ To install Nu via cargo (make sure you have installed [rustup](https://rustup.rs
 cargo install nu
 ```

-You can also build Nu yourself with all the bells and whistles (be sure to have installed the [dependencies](https://www.nushell.sh/book/en/installation.html#dependencies) for your platform), once you have checked out this repo with git:
+You can also build Nu yourself with all the bells and whistles (be sure to have installed the [dependencies](https://www.nushell.sh/book/installation.html#dependencies) for your platform), once you have checked out this repo with git:

 ```bash
 cargo build --workspace --features=extra
@ -139,9 +139,9 @@ Just as the Unix philosophy, Nu allows commands to output from stdout and read f
 Additionally, commands can output structured data (you can think of this as a third kind of stream).
 Commands that work in the pipeline fit into one of three categories:

-* Commands that produce a stream (eg, `ls`)
-* Commands that filter a stream (eg, `where type == "Dir"`)
-* Commands that consume the output of the pipeline (eg, `autoview`)
+-   Commands that produce a stream (eg, `ls`)
+-   Commands that filter a stream (eg, `where type == "Dir"`)
+-   Commands that consume the output of the pipeline (eg, `autoview`)

 Commands are separated by the pipe symbol (`|`) to denote a pipeline flowing left to right.

@ -234,7 +234,7 @@ Here we use the variable `$it` to refer to the value being piped to the external

 ### Configuration

-Nu has early support for configuring the shell. You can refer to the book for a list of [all supported variables](https://www.nushell.sh/book/en/configuration.html).
+Nu has early support for configuring the shell. You can refer to the book for a list of [all supported variables](https://www.nushell.sh/book/configuration.html).

 To set one of these variables, you can use `config set`. For example:

@ -270,40 +270,40 @@ If the plugin is a sink, it is given the full vector of final data and is given

 Nu adheres closely to a set of goals that make up its design philosophy. As features are added, they are checked against these goals.

-* First and foremost, Nu is cross-platform. Commands and techniques should carry between platforms and offer first-class consistent support for Windows, macOS, and Linux.
+-   First and foremost, Nu is cross-platform. Commands and techniques should carry between platforms and offer first-class consistent support for Windows, macOS, and Linux.

-* Nu ensures direct compatibility with existing platform-specific executables that make up people's workflows.
+-   Nu ensures direct compatibility with existing platform-specific executables that make up people's workflows.

-* Nu's workflow and tools should have the usability in day-to-day experience of using a shell in 2019 (and beyond).
+-   Nu's workflow and tools should have the usability in day-to-day experience of using a shell in 2019 (and beyond).

-* Nu views data as both structured and unstructured. It is a structured shell like PowerShell.
+-   Nu views data as both structured and unstructured. It is a structured shell like PowerShell.

-* Finally, Nu views data functionally. Rather than using mutation, pipelines act as a means to load, change, and save data without mutable state.
+-   Finally, Nu views data functionally. Rather than using mutation, pipelines act as a means to load, change, and save data without mutable state.

 ## Commands

-You can find a list of Nu commands, complete with documentation, in [quick command references](https://www.nushell.sh/documentation.html#quick-command-references).
+You can find a list of Nu commands, complete with documentation, in [quick command references](https://www.nushell.sh/book/command_reference.html).

 ## Progress

-Nu is in heavy development, and will naturally change as it matures and people use it.  The chart below isn't meant to be exhaustive, but rather helps give an idea for some of the areas of development and their relative completion:
+Nu is in heavy development, and will naturally change as it matures and people use it. The chart below isn't meant to be exhaustive, but rather helps give an idea for some of the areas of development and their relative completion:

-| Features | Not started | Prototype | MVP | Preview | Mature | Notes
-| -------- |:-----------:|:---------:|:---:|:-------:|:------:| -----
-| Aliases  |             |     X     |     |         |        | Initial implementation but lacks necessary features
-| Notebook |             |     X     |     |         |        | Initial jupyter support, but it loses state and lacks features
-| File ops |             |           |  X  |         |        | cp, mv, rm, mkdir have some support, but lacking others
-| Environment |          |     X     |     |         |        | Temporary environment, but no session-wide env variables
-| Shells   |             |     X     |     |         |        | Basic value and file shells, but no opt-in/opt-out for commands
-| Protocol |             |           |  X  |         |        | Streaming protocol is serviceable
-| Plugins  |             |     X     |     |         |        | Plugins work on one row at a time, lack batching and expression eval
-| Errors   |             |           |  X  |         |        | Error reporting works, but could use usability polish
-| Documentation |        |     X     |     |         |        | Book and related are barebones and lack task-based lessons
-| Paging   |             |     X     |     |         |        | Textview has paging, but we'd like paging for tables
-| Functions|      X      |           |     |         |        | No functions, yet, only aliases
-| Variables|      X      |           |     |         |        | Nu doesn't yet support variables
-| Completions |          |     X     |     |         |        | Completions are currently barebones, at best
-| Type-checking |        |     X     |     |         |        | Commands check basic types, but input/output isn't checked
+| Features      | Not started | Prototype | MVP | Preview | Mature | Notes                                                                |
+| ------------- | :---------: | :-------: | :-: | :-----: | :----: | -------------------------------------------------------------------- |
+| Aliases       |             |     X     |     |         |        | Initial implementation but lacks necessary features                  |
+| Notebook      |             |     X     |     |         |        | Initial jupyter support, but it loses state and lacks features       |
+| File ops      |             |           |  X  |         |        | cp, mv, rm, mkdir have some support, but lacking others              |
+| Environment   |             |     X     |     |         |        | Temporary environment, but no session-wide env variables             |
+| Shells        |             |     X     |     |         |        | Basic value and file shells, but no opt-in/opt-out for commands      |
+| Protocol      |             |           |  X  |         |        | Streaming protocol is serviceable                                    |
+| Plugins       |             |     X     |     |         |        | Plugins work on one row at a time, lack batching and expression eval |
+| Errors        |             |           |  X  |         |        | Error reporting works, but could use usability polish                |
+| Documentation |             |     X     |     |         |        | Book and related are barebones and lack task-based lessons           |
+| Paging        |             |     X     |     |         |        | Textview has paging, but we'd like paging for tables                 |
+| Functions     |             |     X     |     |         |        | No functions, yet, only aliases                                      |
+| Variables     |             |     X     |     |         |        | Nu doesn't yet support variables                                     |
+| Completions   |             |     X     |     |         |        | Completions are currently barebones, at best                         |
+| Type-checking |             |     X     |     |         |        | Commands check basic types, but input/output isn't checked           |

 ## Current Roadmap

@ -313,6 +313,12 @@ We've added a `Roadmap Board` to help collaboratively capture the direction we'r

 See [Contributing](CONTRIBUTING.md) for details.

+Thanks to all the people who already contributed!
+
+<a href="https://github.com/nushell/nushell/graphs/contributors">
+  <img src="https://contributors-img.web.app/image?repo=nushell/nushell" />
+</a>
+
 ## License

 The project is made available under the MIT license. See the `LICENSE` file for more information.
--- a/crates/nu-cli/Cargo.toml
+++ b/crates/nu-cli/Cargo.toml
@ -1,108 +1,111 @@
 [package]
 authors = ["The Nu Project Contributors"]
+build = "build.rs"
 description = "CLI for nushell"
 edition = "2018"
 license = "MIT"
 name = "nu-cli"
-version = "0.23.0"
+version = "0.27.1"

 [lib]
 doctest = false

 [dependencies]
-nu-data = {version = "0.23.0", path = "../nu-data"}
-nu-errors = {version = "0.23.0", path = "../nu-errors"}
-nu-json = {version = "0.23.0", path = "../nu-json"}
-nu-parser = {version = "0.23.0", path = "../nu-parser"}
-nu-plugin = {version = "0.23.0", path = "../nu-plugin"}
-nu-protocol = {version = "0.23.0", path = "../nu-protocol"}
-nu-source = {version = "0.23.0", path = "../nu-source"}
-nu-table = {version = "0.23.0", path = "../nu-table"}
-nu-test-support = {version = "0.23.0", path = "../nu-test-support"}
-nu-value-ext = {version = "0.23.0", path = "../nu-value-ext"}
+nu-command = { version = "0.27.1", path = "../nu-command" }
+nu-data = { version = "0.27.1", path = "../nu-data" }
+nu-engine = { version = "0.27.1", path = "../nu-engine" }
+nu-errors = { version = "0.27.1", path = "../nu-errors" }
+nu-json = { version = "0.27.1", path = "../nu-json" }
+nu-parser = { version = "0.27.1", path = "../nu-parser" }
+nu-plugin = { version = "0.27.1", path = "../nu-plugin" }
+nu-protocol = { version = "0.27.1", path = "../nu-protocol" }
+nu-source = { version = "0.27.1", path = "../nu-source" }
+nu-stream = { version = "0.27.1", path = "../nu-stream" }
+nu-table = { version = "0.27.1", path = "../nu-table" }
+nu-test-support = { version = "0.27.1", path = "../nu-test-support" }
+nu-value-ext = { version = "0.27.1", path = "../nu-value-ext" }

+Inflector = "0.11"
 ansi_term = "0.12.1"
-async-recursion = "0.3.1"
-async-trait = "0.1.40"
-base64 = "0.12.3"
-bigdecimal = {version = "0.2.0", features = ["serde"]}
+arboard = { version = "1.1.0", optional = true }
+async-recursion = "0.3.2"
+async-trait = "0.1.42"
+base64 = "0.13.0"
+bigdecimal = { version = "0.2.0", features = ["serde"] }
 byte-unit = "4.0.9"
-bytes = "0.5.6"
-calamine = "0.16.1"
-chrono = {version = "0.4.15", features = ["serde"]}
+bytes = "1.0.1"
+calamine = "0.17.0"
+chrono = { version = "0.4.19", features = ["serde"] }
+chrono-tz = "0.5.3"
 clap = "2.33.3"
-codespan-reporting = "0.9.5"
-csv = "1.1.3"
-ctrlc = {version = "3.1.6", optional = true}
+codespan-reporting = "0.11.0"
+csv = "1.1.5"
+ctrlc = { version = "3.1.7", optional = true }
 derive-new = "0.5.8"
-directories = {version = "3.0.1", optional = true}
-dirs = {version = "3.0.1", optional = true}
+directories-next = { version = "2.0.0", optional = true }
+dirs-next = { version = "2.0.0", optional = true }
 dtparse = "1.2.0"
 dunce = "1.0.1"
 eml-parser = "0.1.0"
+encoding_rs = "0.8.28"
 filesize = "0.2.0"
 fs_extra = "1.2.0"
-futures = {version = "0.3.5", features = ["compat", "io-compat"]}
-futures-util = "0.3.5"
+futures = { version = "0.3.12", features = ["compat", "io-compat"] }
+futures-util = "0.3.12"
 futures_codec = "0.4.1"
 getset = "0.1.1"
-git2 = {version = "0.13.11", default_features = false, optional = true}
 glob = "0.3.0"
-heim = {version = "0.1.0-beta.3", optional = true}
 htmlescape = "0.3.1"
-ical = "0.6.0"
-ichwh = {version = "0.3.4", optional = true}
-indexmap = {version = "1.6.0", features = ["serde-1"]}
-itertools = "0.9.0"
-log = "0.4.11"
+ical = "0.7.0"
+ichwh = { version = "0.3.4", optional = true }
+indexmap = { version = "1.6.1", features = ["serde-1"] }
+itertools = "0.10.0"
+lazy_static = "1.*"
+log = "0.4.14"
 meval = "0.2.0"
-num-bigint = {version = "0.3.0", features = ["serde"]}
-num-format = {version = "0.4.0", features = ["with-num-bigint"]}
-num-traits = "0.2.12"
-parking_lot = "0.11.0"
+num-bigint = { version = "0.3.1", features = ["serde"] }
+num-format = { version = "0.4.0", features = ["with-num-bigint"] }
+num-traits = "0.2.14"
+parking_lot = "0.11.1"
 pin-utils = "0.1.0"
-pretty-hex = "0.2.0"
-ptree = {version = "0.3.0", optional = true}
+pretty-hex = "0.2.1"
+ptree = { version = "0.3.1", optional = true }
 query_interface = "0.3.5"
-quick-xml = "0.18.1"
-rand = "0.7.3"
-regex = "1.3.9"
-roxmltree = "0.13.0"
-rust-embed = "5.6.0"
-rustyline = {version = "6.3.0", optional = true}
-serde = {version = "1.0.115", features = ["derive"]}
+quick-xml = "0.21.0"
+rand = "0.8.3"
+rayon = "1.5.0"
+regex = "1.4.3"
+roxmltree = "0.14.0"
+rust-embed = "5.9.0"
+rustyline = { version = "6.3.0", optional = true }
+serde = { version = "1.0.123", features = ["derive"] }
 serde_bytes = "0.11.5"
 serde_ini = "0.2.0"
-serde_json = "1.0.57"
+serde_json = "1.0.61"
 serde_urlencoded = "0.7.0"
-serde_yaml = "0.8.13"
-sha2 = "0.9.1"
-shellexpand = "2.0.0"
+serde_yaml = "0.8.16"
+sha2 = "0.9.3"
+shellexpand = "2.1.0"
 strip-ansi-escapes = "0.1.0"
 sxd-document = "0.3.2"
 sxd-xpath = "0.4.2"
-tempfile = "3.1.0"
-term = {version = "0.6.1", optional = true}
+tempfile = "3.2.0"
+term = { version = "0.7.0", optional = true }
 term_size = "0.3.2"
-termcolor = "1.1.0"
-toml = "0.5.6"
-unicode-segmentation = "1.6.0"
-uom = {version = "0.28.0", features = ["f64", "try-from"]}
-uuid_crate = {package = "uuid", version = "0.8.1", features = ["v4"], optional = true}
-which = {version = "4.0.2", optional = true}
-zip = {version = "0.5.7", optional = true}
-lazy_static = "1.*"
-
-Inflector = "0.11"
-clipboard = {version = "0.5.0", optional = true}
-encoding_rs = "0.8.24"
-rayon = "1.4.0"
-trash = {version = "1.2.0", optional = true}
+termcolor = "1.1.2"
+titlecase = "1.1.0"
+toml = "0.5.8"
+trash = { version = "1.3.0", optional = true }
+unicode-segmentation = "1.7.1"
 url = "2.1.1"
+uuid_crate = { package = "uuid", version = "0.8.2", features = ["v4"], optional = true }
+which = { version = "4.0.2", optional = true }
+zip = { version = "0.5.9", optional = true }
+shadow-rs = { version = "0.5", default-features = false, optional = true }

 [target.'cfg(unix)'.dependencies]
 umask = "1.0.0"
-users = "0.10.0"
+users = "0.11.0"

 # TODO this will be possible with new dependency resolver
 #   (currently on nightly behind -Zfeatures=itarget):
@ -113,18 +116,20 @@ users = "0.10.0"
 [dependencies.rusqlite]
 features = ["bundled", "blob"]
 optional = true
-version = "0.24.0"
+version = "0.24.2"

 [build-dependencies]
-git2 = {version = "0.13.11", optional = true}
+shadow-rs = "0.5"

 [dev-dependencies]
-quickcheck = "0.9.2"
-quickcheck_macros = "0.9.1"
+quickcheck = "1.0.3"
+quickcheck_macros = "1.0.0"

 [features]
-clipboard-cli = ["clipboard"]
-rich-benchmark = ["heim"]
-rustyline-support = ["rustyline"]
+default = ["shadow-rs"]
+clipboard-cli = ["arboard"]
+rustyline-support = ["rustyline", "nu-engine/rustyline-support"]
 stable = []
 trash-support = ["trash"]
+dirs = ["dirs-next"]
+directories = ["directories-next"]
--- a/crates/nu-cli/build.rs
+++ b/crates/nu-cli/build.rs
@ -1,36 +1,3 @@
-use std::path::Path;
-use std::{env, fs, io};
-
-fn main() -> Result<(), io::Error> {
-    let out_dir = env::var_os("OUT_DIR").expect(
-    "\
-        OUT_DIR environment variable not found. \
-        OUT_DIR is guaranteed to exist in a build script by cargo - see \
-        https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts\
-    ");
-
-    let latest_commit_hash = latest_commit_hash(env::current_dir()?).unwrap_or_default();
-
-    let commit_hash_path = Path::new(&out_dir).join("git_commit_hash");
-    fs::write(commit_hash_path, latest_commit_hash)?;
-
-    Ok(())
-}
-
-#[allow(unused_variables)]
-fn latest_commit_hash<P: AsRef<Path>>(dir: P) -> Result<String, Box<dyn std::error::Error>> {
-    #[cfg(feature = "git2")]
-    {
-        use git2::Repository;
-        let dir = dir.as_ref();
-        Ok(Repository::discover(dir)?
-            .head()?
-            .peel_to_commit()?
-            .id()
-            .to_string())
-    }
-    #[cfg(not(feature = "git2"))]
-    {
-        Ok(String::new())
-    }
+fn main() -> shadow_rs::SdResult<()> {
+    shadow_rs::new()
 }
--- a/crates/nu-cli/src/cli.rs
+++ b/crates/nu-cli/src/cli.rs
--- a/crates/nu-cli/src/command_registry.rs
+++ b/crates/nu-cli/src/command_registry.rs
@ -1,64 +0,0 @@
-use crate::commands::Command;
-use indexmap::IndexMap;
-use nu_errors::ShellError;
-use nu_parser::SignatureRegistry;
-use nu_protocol::Signature;
-use parking_lot::Mutex;
-use std::sync::Arc;
-
-#[derive(Debug, Clone, Default)]
-pub struct CommandRegistry {
-    registry: Arc<Mutex<IndexMap<String, Command>>>,
-}
-
-impl SignatureRegistry for CommandRegistry {
-    fn has(&self, name: &str) -> bool {
-        let registry = self.registry.lock();
-        registry.contains_key(name)
-    }
-    fn get(&self, name: &str) -> Option<Signature> {
-        let registry = self.registry.lock();
-        registry.get(name).map(|command| command.signature())
-    }
-    fn clone_box(&self) -> Box<dyn SignatureRegistry> {
-        Box::new(self.clone())
-    }
-}
-
-impl CommandRegistry {
-    pub fn new() -> CommandRegistry {
-        CommandRegistry {
-            registry: Arc::new(Mutex::new(IndexMap::default())),
-        }
-    }
-}
-
-impl CommandRegistry {
-    pub fn get_command(&self, name: &str) -> Option<Command> {
-        let registry = self.registry.lock();
-
-        registry.get(name).cloned()
-    }
-
-    pub fn expect_command(&self, name: &str) -> Result<Command, ShellError> {
-        self.get_command(name).ok_or_else(|| {
-            ShellError::untagged_runtime_error(format!("Could not load command: {}", name))
-        })
-    }
-
-    pub fn has(&self, name: &str) -> bool {
-        let registry = self.registry.lock();
-
-        registry.contains_key(name)
-    }
-
-    pub fn insert(&mut self, name: impl Into<String>, command: Command) {
-        let mut registry = self.registry.lock();
-        registry.insert(name.into(), command);
-    }
-
-    pub fn names(&self) -> Vec<String> {
-        let registry = self.registry.lock();
-        registry.keys().cloned().collect()
-    }
-}
--- a/crates/nu-cli/src/commands/alias.rs
+++ b/crates/nu-cli/src/commands/alias.rs
@ -1,221 +0,0 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
-use crate::prelude::*;
-
-use crate::types::deduction::{VarDeclaration, VarSyntaxShapeDeductor};
-use deduction_to_signature::DeductionToSignature;
-use log::trace;
-use nu_data::config;
-use nu_errors::ShellError;
-use nu_protocol::{
-    hir::Block, CommandAction, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value,
-};
-use nu_source::Tagged;
-
-pub struct Alias;
-
-#[derive(Deserialize)]
-pub struct AliasArgs {
-    pub name: Tagged<String>,
-    pub args: Vec<Value>,
-    pub block: Block,
-    pub infer: Option<bool>,
-    pub save: Option<bool>,
-}
-
-#[async_trait]
-impl WholeStreamCommand for Alias {
-    fn name(&self) -> &str {
-        "alias"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("alias")
-            .required("name", SyntaxShape::String, "the name of the alias")
-            .required("args", SyntaxShape::Table, "the arguments to the alias")
-            .required(
-                "block",
-                SyntaxShape::Block,
-                "the block to run as the body of the alias",
-            )
-            .switch("infer", "infer argument types (experimental)", Some('i'))
-            .switch("save", "save the alias to your config", Some('s'))
-    }
-
-    fn usage(&self) -> &str {
-        "Define a shortcut for another command."
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        alias(args, registry).await
-    }
-
-    fn examples(&self) -> Vec<Example> {
-        vec![
-            Example {
-                description: "An alias without parameters",
-                example: "alias say-hi [] { echo 'Hello!' }",
-                result: None,
-            },
-            Example {
-                description: "An alias with a single parameter",
-                example: "alias l [x] { ls $x }",
-                result: None,
-            },
-        ]
-    }
-}
-
-pub async fn alias(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-    let mut raw_input = args.raw_input.clone();
-    let (
-        AliasArgs {
-            name,
-            args: list,
-            block,
-            infer,
-            save,
-        },
-        _ctx,
-    ) = args.process(&registry).await?;
-
-    if let Some(true) = save {
-        let mut result = nu_data::config::read(name.clone().tag, &None)?;
-
-        // process the alias to remove the --save flag
-        let left_brace = raw_input.find('{').unwrap_or(0);
-        let right_brace = raw_input.rfind('}').unwrap_or_else(|| raw_input.len());
-        let left = raw_input[..left_brace]
-            .replace("--save", "") // TODO using regex (or reconstruct string from AST?)
-            .replace("-si", "-i")
-            .replace("-s ", "")
-            .replace("-is", "-i");
-        let right = raw_input[right_brace..]
-            .replace("--save", "")
-            .replace("-si", "-i")
-            .replace("-s ", "")
-            .replace("-is", "-i");
-        raw_input = format!("{}{}{}", left, &raw_input[left_brace..right_brace], right);
-
-        // create a value from raw_input alias
-        let alias: Value = raw_input.trim().to_string().into();
-        let alias_start = raw_input.find('[').unwrap_or(0); // used to check if the same alias already exists
-
-        // add to startup if alias doesn't exist and replace if it does
-        match result.get_mut("startup") {
-            Some(startup) => {
-                if let UntaggedValue::Table(ref mut commands) = startup.value {
-                    if let Some(command) = commands.iter_mut().find(|command| {
-                        let cmd_str = command.as_string().unwrap_or_default();
-                        cmd_str.starts_with(&raw_input[..alias_start])
-                    }) {
-                        *command = alias;
-                    } else {
-                        commands.push(alias);
-                    }
-                }
-            }
-            None => {
-                let table = UntaggedValue::table(&[alias]);
-                result.insert("startup".to_string(), table.into_value(Tag::default()));
-            }
-        }
-        config::write(&result, &None)?;
-    }
-
-    let mut processed_args: Vec<VarDeclaration> = vec![];
-    for (_, item) in list.iter().enumerate() {
-        match item.as_string() {
-            Ok(var_name) => {
-                let dollar_var_name = format!("${}", var_name);
-                processed_args.push(VarDeclaration {
-                    name: dollar_var_name,
-                    // type_decl: None,
-                    span: item.tag.span,
-                });
-            }
-            Err(_) => {
-                return Err(ShellError::labeled_error(
-                    "Expected a string",
-                    "expected a string",
-                    item.tag(),
-                ));
-            }
-        }
-    }
-    trace!("Found vars: {:?}", processed_args);
-
-    let inferred_shapes = {
-        if let Some(true) = infer {
-            VarSyntaxShapeDeductor::infer_vars(&processed_args, &block, &registry)?
-        } else {
-            processed_args.into_iter().map(|arg| (arg, None)).collect()
-        }
-    };
-    let signature = DeductionToSignature::get(&name.item, &inferred_shapes);
-    trace!("Inferred signature: {:?}", signature);
-
-    Ok(OutputStream::one(ReturnSuccess::action(
-        CommandAction::AddAlias(Box::new(signature), block),
-    )))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::Alias;
-    use super::ShellError;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(Alias {})?)
-    }
-}
-
-mod deduction_to_signature {
-    //For now this logic is relativly simple.
-    //For each var, one mandatory positional is added.
-    //As soon as more support for optional positional arguments is arrived,
-    //this logic might be a little bit more tricky.
-    use crate::types::deduction::{Deduction, VarDeclaration};
-    use nu_protocol::{PositionalType, Signature, SyntaxShape};
-
-    pub struct DeductionToSignature {}
-    impl DeductionToSignature {
-        pub fn get(
-            cmd_name: &str,
-            deductions: &[(VarDeclaration, Option<Deduction>)],
-        ) -> Signature {
-            let mut signature = Signature::build(cmd_name);
-            for (decl, deduction) in deductions {
-                match deduction {
-                    None => signature.positional.push((
-                        PositionalType::optional(&decl.name, SyntaxShape::Any),
-                        decl.name.clone(),
-                    )),
-                    Some(deduction) => match deduction {
-                        Deduction::VarShapeDeduction(normal_var_deduction) => {
-                            signature.positional.push((
-                                PositionalType::optional(
-                                    &decl.name,
-                                    normal_var_deduction[0].deduction,
-                                ),
-                                decl.name.clone(),
-                            ))
-                        }
-                    },
-                }
-            }
-            signature
-        }
-    }
-}
--- a/crates/nu-cli/src/commands/classified/block.rs
+++ b/crates/nu-cli/src/commands/classified/block.rs
@ -1,88 +0,0 @@
-use crate::commands::classified::expr::run_expression_block;
-use crate::commands::classified::internal::run_internal_command;
-use crate::evaluation_context::EvaluationContext;
-use crate::prelude::*;
-use crate::stream::InputStream;
-use futures::stream::TryStreamExt;
-use nu_errors::ShellError;
-use nu_protocol::hir::{Block, ClassifiedCommand, Commands};
-use nu_protocol::{ReturnSuccess, Scope, UntaggedValue, Value};
-use std::sync::atomic::Ordering;
-
-pub(crate) async fn run_block(
-    block: &Block,
-    ctx: &mut EvaluationContext,
-    mut input: InputStream,
-    scope: Arc<Scope>,
-) -> Result<InputStream, ShellError> {
-    let mut output: Result<InputStream, ShellError> = Ok(InputStream::empty());
-    for pipeline in &block.block {
-        match output {
-            Ok(inp) if inp.is_empty() => {}
-            Ok(inp) => {
-                let mut output_stream = inp.to_output_stream();
-
-                loop {
-                    match output_stream.try_next().await {
-                        Ok(Some(ReturnSuccess::Value(Value {
-                            value: UntaggedValue::Error(e),
-                            ..
-                        }))) => return Err(e),
-                        Ok(Some(_item)) => {
-                            if let Some(err) = ctx.get_errors().get(0) {
-                                ctx.clear_errors();
-                                return Err(err.clone());
-                            }
-                            if ctx.ctrl_c.load(Ordering::SeqCst) {
-                                break;
-                            }
-                        }
-                        Ok(None) => {
-                            if let Some(err) = ctx.get_errors().get(0) {
-                                ctx.clear_errors();
-                                return Err(err.clone());
-                            }
-                            break;
-                        }
-                        Err(e) => return Err(e),
-                    }
-                }
-            }
-            Err(e) => {
-                return Err(e);
-            }
-        }
-        output = run_pipeline(pipeline, ctx, input, scope.clone()).await;
-
-        input = InputStream::empty();
-    }
-
-    output
-}
-
-async fn run_pipeline(
-    commands: &Commands,
-    ctx: &mut EvaluationContext,
-    mut input: InputStream,
-    scope: Arc<Scope>,
-) -> Result<InputStream, ShellError> {
-    for item in commands.list.clone() {
-        input = match item {
-            ClassifiedCommand::Dynamic(_) => {
-                return Err(ShellError::unimplemented("Dynamic commands"))
-            }
-
-            ClassifiedCommand::Expr(expr) => {
-                run_expression_block(*expr, ctx, scope.clone()).await?
-            }
-
-            ClassifiedCommand::Error(err) => return Err(err.into()),
-
-            ClassifiedCommand::Internal(left) => {
-                run_internal_command(left, ctx, input, scope.clone()).await?
-            }
-        };
-    }
-
-    Ok(input)
-}
--- a/crates/nu-cli/src/commands/classified/mod.rs
+++ b/crates/nu-cli/src/commands/classified/mod.rs
@ -1,10 +0,0 @@
-pub(crate) mod block;
-mod dynamic;
-pub(crate) mod expr;
-pub(crate) mod external;
-pub(crate) mod internal;
-pub(crate) mod maybe_text_codec;
-pub(crate) mod plugin;
-
-#[allow(unused_imports)]
-pub(crate) use dynamic::Command as DynamicCommand;
--- a/crates/nu-cli/src/commands/command.rs
+++ b/crates/nu-cli/src/commands/command.rs
@ -1,340 +0,0 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::help::get_help;
-use crate::deserializer::ConfigDeserializer;
-use crate::evaluate::evaluate_args::evaluate_args;
-use crate::prelude::*;
-use derive_new::new;
-use getset::Getters;
-use nu_errors::ShellError;
-use nu_protocol::hir;
-use nu_protocol::{CallInfo, EvaluatedArgs, ReturnSuccess, Scope, Signature, UntaggedValue, Value};
-use parking_lot::Mutex;
-use serde::{Deserialize, Serialize};
-use std::ops::Deref;
-use std::sync::atomic::AtomicBool;
-
-#[derive(Deserialize, Serialize, Debug, Clone)]
-pub struct UnevaluatedCallInfo {
-    pub args: hir::Call,
-    pub name_tag: Tag,
-    pub scope: Arc<Scope>,
-}
-
-impl UnevaluatedCallInfo {
-    pub async fn evaluate(self, registry: &CommandRegistry) -> Result<CallInfo, ShellError> {
-        let args = evaluate_args(&self.args, registry, self.scope.clone()).await?;
-
-        Ok(CallInfo {
-            args,
-            name_tag: self.name_tag,
-        })
-    }
-
-    pub fn switch_present(&self, switch: &str) -> bool {
-        self.args.switch_preset(switch)
-    }
-}
-
-#[derive(Getters)]
-#[get = "pub(crate)"]
-pub struct CommandArgs {
-    pub host: Arc<parking_lot::Mutex<Box<dyn Host>>>,
-    pub ctrl_c: Arc<AtomicBool>,
-    pub current_errors: Arc<Mutex<Vec<ShellError>>>,
-    pub shell_manager: ShellManager,
-    pub call_info: UnevaluatedCallInfo,
-    pub input: InputStream,
-    pub raw_input: String,
-}
-
-#[derive(Getters, Clone)]
-#[get = "pub(crate)"]
-pub struct RawCommandArgs {
-    pub host: Arc<parking_lot::Mutex<Box<dyn Host>>>,
-    pub ctrl_c: Arc<AtomicBool>,
-    pub current_errors: Arc<Mutex<Vec<ShellError>>>,
-    pub shell_manager: ShellManager,
-    pub call_info: UnevaluatedCallInfo,
-}
-
-impl RawCommandArgs {
-    pub fn with_input(self, input: impl Into<InputStream>) -> CommandArgs {
-        CommandArgs {
-            host: self.host,
-            ctrl_c: self.ctrl_c,
-            current_errors: self.current_errors,
-            shell_manager: self.shell_manager,
-            call_info: self.call_info,
-            input: input.into(),
-            raw_input: String::default(),
-        }
-    }
-}
-
-impl std::fmt::Debug for CommandArgs {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        self.call_info.fmt(f)
-    }
-}
-
-impl CommandArgs {
-    pub async fn evaluate_once(
-        self,
-        registry: &CommandRegistry,
-    ) -> Result<EvaluatedWholeStreamCommandArgs, ShellError> {
-        let host = self.host.clone();
-        let ctrl_c = self.ctrl_c.clone();
-        let shell_manager = self.shell_manager.clone();
-        let input = self.input;
-        let call_info = self.call_info.evaluate(registry).await?;
-
-        Ok(EvaluatedWholeStreamCommandArgs::new(
-            host,
-            ctrl_c,
-            shell_manager,
-            call_info,
-            input,
-        ))
-    }
-
-    pub async fn evaluate_once_with_scope(
-        self,
-        registry: &CommandRegistry,
-        scope: Arc<Scope>,
-    ) -> Result<EvaluatedWholeStreamCommandArgs, ShellError> {
-        let host = self.host.clone();
-        let ctrl_c = self.ctrl_c.clone();
-        let shell_manager = self.shell_manager.clone();
-        let input = self.input;
-        let call_info = UnevaluatedCallInfo {
-            name_tag: self.call_info.name_tag,
-            args: self.call_info.args,
-            scope: scope.clone(),
-        };
-        let call_info = call_info.evaluate(registry).await?;
-
-        Ok(EvaluatedWholeStreamCommandArgs::new(
-            host,
-            ctrl_c,
-            shell_manager,
-            call_info,
-            input,
-        ))
-    }
-
-    pub async fn process<'de, T: Deserialize<'de>>(
-        self,
-        registry: &CommandRegistry,
-    ) -> Result<(T, InputStream), ShellError> {
-        let args = self.evaluate_once(registry).await?;
-        let call_info = args.call_info.clone();
-
-        let mut deserializer = ConfigDeserializer::from_call_info(call_info);
-
-        Ok((T::deserialize(&mut deserializer)?, args.input))
-    }
-}
-
-pub struct RunnableContext {
-    pub input: InputStream,
-    pub shell_manager: ShellManager,
-    pub host: Arc<parking_lot::Mutex<Box<dyn Host>>>,
-    pub ctrl_c: Arc<AtomicBool>,
-    pub current_errors: Arc<Mutex<Vec<ShellError>>>,
-    pub registry: CommandRegistry,
-    pub name: Tag,
-    pub raw_input: String,
-}
-
-impl RunnableContext {
-    pub fn get_command(&self, name: &str) -> Option<Command> {
-        self.registry.get_command(name)
-    }
-}
-
-pub struct EvaluatedWholeStreamCommandArgs {
-    pub args: EvaluatedCommandArgs,
-    pub input: InputStream,
-}
-
-impl Deref for EvaluatedWholeStreamCommandArgs {
-    type Target = EvaluatedCommandArgs;
-    fn deref(&self) -> &Self::Target {
-        &self.args
-    }
-}
-
-impl EvaluatedWholeStreamCommandArgs {
-    pub fn new(
-        host: Arc<parking_lot::Mutex<dyn Host>>,
-        ctrl_c: Arc<AtomicBool>,
-        shell_manager: ShellManager,
-        call_info: CallInfo,
-        input: impl Into<InputStream>,
-    ) -> EvaluatedWholeStreamCommandArgs {
-        EvaluatedWholeStreamCommandArgs {
-            args: EvaluatedCommandArgs {
-                host,
-                ctrl_c,
-                shell_manager,
-                call_info,
-            },
-            input: input.into(),
-        }
-    }
-
-    pub fn name_tag(&self) -> Tag {
-        self.args.call_info.name_tag.clone()
-    }
-
-    pub fn parts(self) -> (InputStream, EvaluatedArgs) {
-        let EvaluatedWholeStreamCommandArgs { args, input } = self;
-
-        (input, args.call_info.args)
-    }
-
-    pub fn split(self) -> (InputStream, EvaluatedCommandArgs) {
-        let EvaluatedWholeStreamCommandArgs { args, input } = self;
-
-        (input, args)
-    }
-}
-
-#[derive(Getters, new)]
-#[get = "pub(crate)"]
-pub struct EvaluatedCommandArgs {
-    pub host: Arc<parking_lot::Mutex<dyn Host>>,
-    pub ctrl_c: Arc<AtomicBool>,
-    pub shell_manager: ShellManager,
-    pub call_info: CallInfo,
-}
-
-impl EvaluatedCommandArgs {
-    pub fn nth(&self, pos: usize) -> Option<&Value> {
-        self.call_info.args.nth(pos)
-    }
-
-    /// Get the nth positional argument, error if not possible
-    pub fn expect_nth(&self, pos: usize) -> Result<&Value, ShellError> {
-        self.call_info
-            .args
-            .nth(pos)
-            .ok_or_else(|| ShellError::unimplemented("Better error: expect_nth"))
-    }
-
-    pub fn get(&self, name: &str) -> Option<&Value> {
-        self.call_info.args.get(name)
-    }
-
-    pub fn has(&self, name: &str) -> bool {
-        self.call_info.args.has(name)
-    }
-}
-
-pub struct Example {
-    pub example: &'static str,
-    pub description: &'static str,
-    pub result: Option<Vec<Value>>,
-}
-
-#[async_trait]
-pub trait WholeStreamCommand: Send + Sync {
-    fn name(&self) -> &str;
-
-    fn signature(&self) -> Signature {
-        Signature::new(self.name()).desc(self.usage()).filter()
-    }
-
-    fn usage(&self) -> &str;
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError>;
-
-    fn is_binary(&self) -> bool {
-        false
-    }
-
-    // Commands that are not meant to be run by users
-    fn is_internal(&self) -> bool {
-        false
-    }
-
-    fn examples(&self) -> Vec<Example> {
-        Vec::new()
-    }
-}
-
-#[derive(Clone)]
-pub struct Command(Arc<dyn WholeStreamCommand>);
-
-impl PrettyDebugWithSource for Command {
-    fn pretty_debug(&self, source: &str) -> DebugDocBuilder {
-        b::typed(
-            "whole stream command",
-            b::description(self.name())
-                + b::space()
-                + b::equals()
-                + b::space()
-                + self.signature().pretty_debug(source),
-        )
-    }
-}
-
-impl std::fmt::Debug for Command {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "Command({})", self.name())
-    }
-}
-
-impl Command {
-    pub fn name(&self) -> &str {
-        self.0.name()
-    }
-
-    pub fn signature(&self) -> Signature {
-        self.0.signature()
-    }
-
-    pub fn usage(&self) -> &str {
-        self.0.usage()
-    }
-
-    pub fn examples(&self) -> Vec<Example> {
-        self.0.examples()
-    }
-
-    pub async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        if args.call_info.switch_present("help") {
-            let cl = self.0.clone();
-            let registry = registry.clone();
-            Ok(OutputStream::one(Ok(ReturnSuccess::Value(
-                UntaggedValue::string(get_help(&*cl, &registry)).into_value(Tag::unknown()),
-            ))))
-        } else {
-            self.0.run(args, registry).await
-        }
-    }
-
-    pub fn is_binary(&self) -> bool {
-        self.0.is_binary()
-    }
-
-    pub fn is_internal(&self) -> bool {
-        self.0.is_internal()
-    }
-
-    pub fn stream_command(&self) -> &dyn WholeStreamCommand {
-        &*self.0
-    }
-}
-
-pub fn whole_stream_command(command: impl WholeStreamCommand + 'static) -> Command {
-    Command(Arc::new(command))
-}
--- a/crates/nu-cli/src/commands/date/format.rs
+++ b/crates/nu-cli/src/commands/date/format.rs
@ -1,76 +0,0 @@
-use crate::prelude::*;
-use chrono::{DateTime, Local};
-use nu_errors::ShellError;
-
-use crate::commands::date::utils::{date_to_value, date_to_value_raw};
-use crate::commands::WholeStreamCommand;
-use nu_protocol::{Signature, SyntaxShape, UntaggedValue};
-use nu_source::Tagged;
-
-pub struct Date;
-
-#[derive(Deserialize)]
-pub struct FormatArgs {
-    format: Tagged<String>,
-    raw: Option<bool>,
-}
-
-#[async_trait]
-impl WholeStreamCommand for Date {
-    fn name(&self) -> &str {
-        "date format"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("date format")
-            .required("format", SyntaxShape::String, "strftime format")
-            .switch("raw", "print date without tables", Some('r'))
-    }
-
-    fn usage(&self) -> &str {
-        "format the current date using the given format string."
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        format(args, registry).await
-    }
-}
-
-pub async fn format(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-    let tag = args.call_info.name_tag.clone();
-    let (FormatArgs { format, raw }, _) = args.process(&registry).await?;
-
-    let dt_fmt = format.to_string();
-
-    let value = {
-        let local: DateTime<Local> = Local::now();
-        if let Some(true) = raw {
-            UntaggedValue::string(date_to_value_raw(local, dt_fmt)).into_untagged_value()
-        } else {
-            date_to_value(local, tag, dt_fmt)
-        }
-    };
-
-    Ok(OutputStream::one(value))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::Date;
-    use super::ShellError;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(Date {})?)
-    }
-}
--- a/crates/nu-cli/src/commands/date/mod.rs
+++ b/crates/nu-cli/src/commands/date/mod.rs
@ -1,11 +0,0 @@
-pub mod command;
-pub mod format;
-pub mod now;
-pub mod utc;
-
-mod utils;
-
-pub use command::Command as Date;
-pub use format::Date as DateFormat;
-pub use now::Date as DateNow;
-pub use utc::Date as DateUTC;
--- a/crates/nu-cli/src/commands/date/now.rs
+++ b/crates/nu-cli/src/commands/date/now.rs
@ -1,63 +0,0 @@
-use crate::prelude::*;
-use chrono::{DateTime, Local};
-use nu_errors::ShellError;
-
-use crate::commands::date::utils::date_to_value;
-use crate::commands::WholeStreamCommand;
-use nu_protocol::Signature;
-
-pub struct Date;
-
-#[async_trait]
-impl WholeStreamCommand for Date {
-    fn name(&self) -> &str {
-        "date now"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("date now")
-    }
-
-    fn usage(&self) -> &str {
-        "return the current date."
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        now(args, registry).await
-    }
-}
-
-pub async fn now(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-    let args = args.evaluate_once(&registry).await?;
-    let tag = args.call_info.name_tag.clone();
-
-    let no_fmt = "".to_string();
-
-    let value = {
-        let local: DateTime<Local> = Local::now();
-        date_to_value(local, tag, no_fmt)
-    };
-
-    Ok(OutputStream::one(value))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::Date;
-    use super::ShellError;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(Date {})?)
-    }
-}
--- a/crates/nu-cli/src/commands/date/utils.rs
+++ b/crates/nu-cli/src/commands/date/utils.rs
@ -1,64 +0,0 @@
-use crate::prelude::*;
-use chrono::DateTime;
-use nu_protocol::{Dictionary, Value};
-
-use chrono::{Datelike, TimeZone, Timelike};
-use core::fmt::Display;
-use indexmap::IndexMap;
-use nu_protocol::UntaggedValue;
-
-pub fn date_to_value_raw<T: TimeZone>(dt: DateTime<T>, dt_format: String) -> String
-where
-    T::Offset: Display,
-{
-    let result = dt.format(&dt_format);
-    format!("{}", result)
-}
-
-pub fn date_to_value<T: TimeZone>(dt: DateTime<T>, tag: Tag, dt_format: String) -> Value
-where
-    T::Offset: Display,
-{
-    let mut indexmap = IndexMap::new();
-
-    if dt_format.is_empty() {
-        indexmap.insert(
-            "year".to_string(),
-            UntaggedValue::int(dt.year()).into_value(&tag),
-        );
-        indexmap.insert(
-            "month".to_string(),
-            UntaggedValue::int(dt.month()).into_value(&tag),
-        );
-        indexmap.insert(
-            "day".to_string(),
-            UntaggedValue::int(dt.day()).into_value(&tag),
-        );
-        indexmap.insert(
-            "hour".to_string(),
-            UntaggedValue::int(dt.hour()).into_value(&tag),
-        );
-        indexmap.insert(
-            "minute".to_string(),
-            UntaggedValue::int(dt.minute()).into_value(&tag),
-        );
-        indexmap.insert(
-            "second".to_string(),
-            UntaggedValue::int(dt.second()).into_value(&tag),
-        );
-
-        let tz = dt.offset();
-        indexmap.insert(
-            "timezone".to_string(),
-            UntaggedValue::string(format!("{}", tz)).into_value(&tag),
-        );
-    } else {
-        let result = dt.format(&dt_format);
-        indexmap.insert(
-            "formatted".to_string(),
-            UntaggedValue::string(format!("{}", result)).into_value(&tag),
-        );
-    }
-
-    UntaggedValue::Row(Dictionary::from(indexmap)).into_value(&tag)
-}
--- a/crates/nu-cli/src/commands/format/format_filesize.rs
+++ b/crates/nu-cli/src/commands/format/format_filesize.rs
@ -1,194 +0,0 @@
-use crate::prelude::*;
-use nu_errors::ShellError;
-
-use crate::commands::WholeStreamCommand;
-use nu_protocol::{
-    ColumnPath, Primitive::Filesize, ReturnSuccess, Signature, SyntaxShape, UntaggedValue,
-    UntaggedValue::Primitive, Value,
-};
-use nu_source::Tagged;
-use nu_value_ext::get_data_by_column_path;
-
-use num_format::{Locale, ToFormattedString};
-
-pub struct FileSize;
-
-#[derive(Deserialize)]
-pub struct Arguments {
-    field: ColumnPath,
-    format: Tagged<String>,
-}
-
-#[async_trait]
-impl WholeStreamCommand for FileSize {
-    fn name(&self) -> &str {
-        "format filesize"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("format filesize")
-            .required(
-                "field",
-                SyntaxShape::ColumnPath,
-                "the name of the column to update",
-            )
-            .required(
-                "format value",
-                SyntaxShape::String,
-                "the format into which convert the filesizes",
-            )
-    }
-
-    fn usage(&self) -> &str {
-        "Converts a column of filesizes to some specified format"
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        filesize(args, registry).await
-    }
-
-    fn examples(&self) -> Vec<Example> {
-        vec![
-            Example {
-                description: "Convert the size row to KB",
-                example: "ls | format filesize size KB",
-                result: None,
-            },
-            Example {
-                description: "Convert the apparent row to B",
-                example: "du | format filesize apparent B",
-                result: None,
-            },
-        ]
-    }
-}
-
-async fn process_row(
-    input: Value,
-    format: Tagged<String>,
-    field: Arc<ColumnPath>,
-) -> Result<OutputStream, ShellError> {
-    Ok({
-        let replace_for = get_data_by_column_path(&input, &field, move |_, _, error| error);
-        match replace_for {
-            Ok(s) => match convert_bytes_to_string_using_format(s, format) {
-                Ok(b) => OutputStream::one(ReturnSuccess::value(
-                    input.replace_data_at_column_path(&field, b).expect("Given that the existance check was already done, this souldn't trigger never"),
-                )),
-                Err(e) => OutputStream::one(Err(e)),
-            },
-            Err(e) => OutputStream::one(Err(e)),
-        }
-    })
-}
-
-async fn filesize(
-    raw_args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-    let (Arguments { field, format }, input) = raw_args.process(&registry).await?;
-    let field = Arc::new(field);
-
-    Ok(input
-        .then(move |input| {
-            let format = format.clone();
-            let field = field.clone();
-
-            async {
-                match process_row(input, format, field).await {
-                    Ok(s) => s,
-                    Err(e) => OutputStream::one(Err(e)),
-                }
-            }
-        })
-        .flatten()
-        .to_output_stream())
-}
-
-fn convert_bytes_to_string_using_format(
-    bytes: Value,
-    format: Tagged<String>,
-) -> Result<Value, ShellError> {
-    match bytes.value {
-        Primitive(Filesize(b)) => {
-            let byte = byte_unit::Byte::from_bytes(b as u128);
-            let value = match format.item().to_lowercase().as_str() {
-                "b" => Ok(UntaggedValue::string(b.to_formatted_string(&Locale::en))),
-                "kb" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::KB).to_string(),
-                )),
-                "kib" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::KiB).to_string(),
-                )),
-                "mb" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::MB).to_string(),
-                )),
-                "mib" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::MiB).to_string(),
-                )),
-                "gb" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::GB).to_string(),
-                )),
-                "gib" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::GiB).to_string(),
-                )),
-                "tb" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::TB).to_string(),
-                )),
-                "tib" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::TiB).to_string(),
-                )),
-                "pb" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::PB).to_string(),
-                )),
-                "pib" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::PiB).to_string(),
-                )),
-                "eb" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::EB).to_string(),
-                )),
-                "eib" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::EiB).to_string(),
-                )),
-                "zb" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::ZB).to_string(),
-                )),
-                "zib" => Ok(UntaggedValue::string(
-                    byte.get_adjusted_unit(byte_unit::ByteUnit::ZiB).to_string(),
-                )),
-                _ => Err(ShellError::labeled_error(
-                    format!("Invalid format code: {:}", format.item()),
-                    "invalid format",
-                    format.tag(),
-                )),
-            };
-            match value {
-                Ok(b) => Ok(Value { value: b, ..bytes }),
-                Err(e) => Err(e),
-            }
-        }
-        _ => Err(ShellError::labeled_error(
-            "the data in this row is not of the type filesize",
-            "invalid row type",
-            bytes.tag(),
-        )),
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::FileSize;
-    use super::ShellError;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(FileSize {})?)
-    }
-}
--- a/crates/nu-cli/src/commands/if_.rs
+++ b/crates/nu-cli/src/commands/if_.rs
@ -1,185 +0,0 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::classified::block::run_block;
-use crate::commands::WholeStreamCommand;
-use crate::evaluate::evaluate_baseline_expr;
-use crate::prelude::*;
-use nu_errors::ShellError;
-use nu_protocol::{
-    hir::Block, hir::ClassifiedCommand, Scope, Signature, SyntaxShape, UntaggedValue,
-};
-
-pub struct If;
-
-#[derive(Deserialize)]
-pub struct IfArgs {
-    condition: Block,
-    then_case: Block,
-    else_case: Block,
-}
-
-#[async_trait]
-impl WholeStreamCommand for If {
-    fn name(&self) -> &str {
-        "if"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("if")
-            .required(
-                "condition",
-                SyntaxShape::Math,
-                "the condition that must match",
-            )
-            .required(
-                "then_case",
-                SyntaxShape::Block,
-                "block to run if condition is true",
-            )
-            .required(
-                "else_case",
-                SyntaxShape::Block,
-                "block to run if condition is false",
-            )
-    }
-
-    fn usage(&self) -> &str {
-        "Run blocks if a condition is true or false."
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        if_command(args, registry).await
-    }
-
-    fn examples(&self) -> Vec<Example> {
-        vec![
-            Example {
-                description: "Run a block if a condition is true",
-                example: "echo 10 | if $it > 5 { echo 'greater than 5' } { echo 'less than or equal to 5' }",
-                result: Some(vec![UntaggedValue::string("greater than 5").into()]),
-            },
-            Example {
-                description: "Run a block if a condition is false",
-                example: "echo 1 | if $it > 5 { echo 'greater than 5' } { echo 'less than or equal to 5' }",
-                result: Some(vec![UntaggedValue::string("less than or equal to 5").into()]),
-            },
-        ]
-    }
-}
-async fn if_command(
-    raw_args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = Arc::new(registry.clone());
-    let scope = raw_args.call_info.scope.clone();
-    let tag = raw_args.call_info.name_tag.clone();
-    let context = Arc::new(EvaluationContext::from_raw(&raw_args, &registry));
-
-    let (
-        IfArgs {
-            condition,
-            then_case,
-            else_case,
-        },
-        input,
-    ) = raw_args.process(&registry).await?;
-    let condition = {
-        if condition.block.len() != 1 {
-            return Err(ShellError::labeled_error(
-                "Expected a condition",
-                "expected a condition",
-                tag,
-            ));
-        }
-        match condition.block[0].list.get(0) {
-            Some(item) => match item {
-                ClassifiedCommand::Expr(expr) => expr.clone(),
-                _ => {
-                    return Err(ShellError::labeled_error(
-                        "Expected a condition",
-                        "expected a condition",
-                        tag,
-                    ));
-                }
-            },
-            None => {
-                return Err(ShellError::labeled_error(
-                    "Expected a condition",
-                    "expected a condition",
-                    tag,
-                ));
-            }
-        }
-    };
-
-    Ok(input
-        .then(move |input| {
-            let condition = condition.clone();
-            let then_case = then_case.clone();
-            let else_case = else_case.clone();
-            let registry = registry.clone();
-            let scope = Scope::append_var(scope.clone(), "$it", input);
-            let mut context = context.clone();
-
-            async move {
-                //FIXME: should we use the scope that's brought in as well?
-                let condition = evaluate_baseline_expr(&condition, &*registry, scope.clone()).await;
-
-                match condition {
-                    Ok(condition) => match condition.as_bool() {
-                        Ok(b) => {
-                            if b {
-                                match run_block(
-                                    &then_case,
-                                    Arc::make_mut(&mut context),
-                                    InputStream::empty(),
-                                    scope,
-                                )
-                                .await
-                                {
-                                    Ok(stream) => stream.to_output_stream(),
-                                    Err(e) => futures::stream::iter(vec![Err(e)].into_iter())
-                                        .to_output_stream(),
-                                }
-                            } else {
-                                match run_block(
-                                    &else_case,
-                                    Arc::make_mut(&mut context),
-                                    InputStream::empty(),
-                                    scope,
-                                )
-                                .await
-                                {
-                                    Ok(stream) => stream.to_output_stream(),
-                                    Err(e) => futures::stream::iter(vec![Err(e)].into_iter())
-                                        .to_output_stream(),
-                                }
-                            }
-                        }
-                        Err(e) => {
-                            futures::stream::iter(vec![Err(e)].into_iter()).to_output_stream()
-                        }
-                    },
-                    Err(e) => futures::stream::iter(vec![Err(e)].into_iter()).to_output_stream(),
-                }
-            }
-        })
-        .flatten()
-        .to_output_stream())
-}
-
-#[cfg(test)]
-mod tests {
-    use super::If;
-    use super::ShellError;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(If {})?)
-    }
-}
--- a/crates/nu-cli/src/commands/run_alias.rs
+++ b/crates/nu-cli/src/commands/run_alias.rs
@ -1,78 +0,0 @@
-use crate::commands::classified::block::run_block;
-use crate::commands::WholeStreamCommand;
-use crate::prelude::*;
-
-use derive_new::new;
-use nu_errors::ShellError;
-use nu_protocol::{hir::Block, PositionalType, Scope, Signature, UntaggedValue};
-
-#[derive(new, Clone)]
-pub struct AliasCommand {
-    sig: Signature,
-    block: Block,
-}
-
-#[async_trait]
-impl WholeStreamCommand for AliasCommand {
-    fn name(&self) -> &str {
-        &self.sig.name
-    }
-
-    fn signature(&self) -> Signature {
-        self.sig.clone()
-    }
-
-    fn usage(&self) -> &str {
-        ""
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        let call_info = args.call_info.clone();
-        let registry = registry.clone();
-        let mut block = self.block.clone();
-        block.set_redirect(call_info.args.external_redirection);
-
-        // let alias_command = self.clone();
-        let mut context = EvaluationContext::from_args(&args, &registry);
-        let input = args.input;
-
-        let scope = call_info.scope.clone();
-        let evaluated = call_info.evaluate(&registry).await?;
-
-        let mut vars = IndexMap::new();
-        let mut num_positionals = 0;
-        if let Some(positional) = &evaluated.args.positional {
-            num_positionals = positional.len();
-            for (idx, arg) in positional.iter().enumerate() {
-                let pos_type = &self.sig.positional[idx].0;
-                match pos_type {
-                    PositionalType::Mandatory(name, _) | PositionalType::Optional(name, _) => {
-                        vars.insert(name.clone(), arg.clone());
-                    }
-                }
-            }
-        }
-        //Fill out every missing argument with empty value
-        if self.sig.positional.len() > num_positionals {
-            for idx in num_positionals..self.sig.positional.len() {
-                let pos_type = &self.sig.positional[idx].0;
-                match pos_type {
-                    PositionalType::Mandatory(name, _) | PositionalType::Optional(name, _) => {
-                        vars.insert(name.clone(), UntaggedValue::nothing().into_untagged_value());
-                    }
-                }
-            }
-        }
-
-        let scope = Scope::append_vars(scope, vars);
-
-        // FIXME: we need to patch up the spans to point at the top-level error
-        Ok(run_block(&block, &mut context, input, scope)
-            .await?
-            .to_output_stream())
-    }
-}
--- a/crates/nu-cli/src/commands/str_/collect.rs
+++ b/crates/nu-cli/src/commands/str_/collect.rs
@ -1,78 +0,0 @@
-use crate::commands::WholeStreamCommand;
-use crate::prelude::*;
-use nu_errors::ShellError;
-use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
-use nu_source::Tagged;
-
-pub struct SubCommand;
-
-#[derive(Deserialize)]
-pub struct SubCommandArgs {
-    separator: Option<Tagged<String>>,
-}
-
-#[async_trait]
-impl WholeStreamCommand for SubCommand {
-    fn name(&self) -> &str {
-        "str collect"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("str collect").desc(self.usage()).optional(
-            "separator",
-            SyntaxShape::String,
-            "the separator to put between the different values",
-        )
-    }
-
-    fn usage(&self) -> &str {
-        "collects a list of strings into a string"
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        collect(args, registry).await
-    }
-
-    fn examples(&self) -> Vec<Example> {
-        vec![Example {
-            description: "Collect a list of string",
-            example: "echo ['a' 'b' 'c'] | str collect",
-            result: Some(vec![Value::from("abc")]),
-        }]
-    }
-}
-
-pub async fn collect(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let tag = args.call_info.name_tag.clone();
-    let (SubCommandArgs { separator }, input) = args.process(registry).await?;
-    let separator = separator.map(|tagged| tagged.item).unwrap_or_default();
-
-    let strings: Vec<Result<String, ShellError>> =
-        input.map(|value| value.as_string()).collect().await;
-    let strings: Vec<String> = strings.into_iter().collect::<Result<_, _>>()?;
-    let output = strings.join(&separator);
-
-    Ok(OutputStream::one(ReturnSuccess::value(
-        UntaggedValue::string(output).into_value(tag),
-    )))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::ShellError;
-    use super::SubCommand;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(SubCommand {})?)
-    }
-}
--- a/crates/nu-cli/src/commands/str_/length.rs
+++ b/crates/nu-cli/src/commands/str_/length.rs
@ -1,66 +0,0 @@
-use crate::commands::WholeStreamCommand;
-use crate::prelude::*;
-use nu_errors::ShellError;
-use nu_protocol::{ReturnSuccess, Signature, UntaggedValue};
-
-pub struct SubCommand;
-
-#[async_trait]
-impl WholeStreamCommand for SubCommand {
-    fn name(&self) -> &str {
-        "str length"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("str length")
-    }
-
-    fn usage(&self) -> &str {
-        "outputs the lengths of the strings in the pipeline"
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        _registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        Ok(args
-            .input
-            .map(move |x| match x.as_string() {
-                Ok(s) => ReturnSuccess::value(UntaggedValue::int(s.len()).into_untagged_value()),
-                Err(err) => Err(err),
-            })
-            .to_output_stream())
-    }
-
-    fn examples(&self) -> Vec<Example> {
-        vec![
-            Example {
-                description: "Return the lengths of multiple strings",
-                example: "echo 'hello' | str length",
-                result: Some(vec![UntaggedValue::int(5).into_untagged_value()]),
-            },
-            Example {
-                description: "Return the lengths of multiple strings",
-                example: "echo 'hi' 'there' | str length",
-                result: Some(vec![
-                    UntaggedValue::int(2).into_untagged_value(),
-                    UntaggedValue::int(5).into_untagged_value(),
-                ]),
-            },
-        ]
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::ShellError;
-    use super::SubCommand;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(SubCommand {})?)
-    }
-}
--- a/crates/nu-cli/src/commands/str_/reverse.rs
+++ b/crates/nu-cli/src/commands/str_/reverse.rs
@ -1,59 +0,0 @@
-use crate::commands::WholeStreamCommand;
-use crate::prelude::*;
-use nu_errors::ShellError;
-use nu_protocol::{ReturnSuccess, Signature, UntaggedValue};
-
-pub struct SubCommand;
-
-#[async_trait]
-impl WholeStreamCommand for SubCommand {
-    fn name(&self) -> &str {
-        "str reverse"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("str reverse")
-    }
-
-    fn usage(&self) -> &str {
-        "outputs the reversals of the strings in the pipeline"
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        _registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        Ok(args
-            .input
-            .map(move |x| match x.as_string() {
-                Ok(s) => ReturnSuccess::value(
-                    UntaggedValue::string(s.chars().rev().collect::<String>())
-                        .into_untagged_value(),
-                ),
-                Err(err) => Err(err),
-            })
-            .to_output_stream())
-    }
-
-    fn examples(&self) -> Vec<Example> {
-        vec![Example {
-            description: "Return the reversals of multiple strings",
-            example: "echo 'Nushell' | str reverse",
-            result: Some(vec![UntaggedValue::string("llehsuN").into_untagged_value()]),
-        }]
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::ShellError;
-    use super::SubCommand;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(SubCommand {})?)
-    }
-}
--- a/crates/nu-cli/src/commands/str_/set.rs
+++ b/crates/nu-cli/src/commands/str_/set.rs
@ -1,124 +0,0 @@
-use crate::commands::WholeStreamCommand;
-use crate::prelude::*;
-use nu_errors::ShellError;
-use nu_protocol::{ColumnPath, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
-use nu_source::{Tag, Tagged};
-use nu_value_ext::ValueExt;
-
-#[derive(Deserialize)]
-struct Arguments {
-    replace: Tagged<String>,
-    rest: Vec<ColumnPath>,
-}
-
-pub struct SubCommand;
-
-#[async_trait]
-impl WholeStreamCommand for SubCommand {
-    fn name(&self) -> &str {
-        "str set"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("str set")
-            .required("set", SyntaxShape::String, "the new string to set")
-            .rest(
-                SyntaxShape::ColumnPath,
-                "optionally set text by column paths",
-            )
-    }
-
-    fn usage(&self) -> &str {
-        "sets text"
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        operate(args, registry).await
-    }
-
-    fn examples(&self) -> Vec<Example> {
-        vec![
-            Example {
-                description: "Set contents with preferred string",
-                example: "echo 'good day' | str set 'good bye'",
-                result: Some(vec![Value::from("good bye")]),
-            },
-            Example {
-                description: "Set the contents on preferred column paths",
-                example: "open Cargo.toml | str set '255' package.version",
-                result: None,
-            },
-        ]
-    }
-}
-
-#[derive(Clone)]
-struct Replace(String);
-
-async fn operate(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-
-    let (Arguments { replace, rest }, input) = args.process(&registry).await?;
-    let options = Replace(replace.item);
-
-    let column_paths: Vec<_> = rest;
-
-    Ok(input
-        .map(move |v| {
-            if column_paths.is_empty() {
-                ReturnSuccess::value(action(&v, &options, v.tag())?)
-            } else {
-                let mut ret = v;
-
-                for path in &column_paths {
-                    let options = options.clone();
-
-                    ret = ret.swap_data_by_column_path(
-                        path,
-                        Box::new(move |old| action(old, &options, old.tag())),
-                    )?;
-                }
-
-                ReturnSuccess::value(ret)
-            }
-        })
-        .to_output_stream())
-}
-
-fn action(_input: &Value, options: &Replace, tag: impl Into<Tag>) -> Result<Value, ShellError> {
-    let replacement = &options.0;
-    Ok(UntaggedValue::string(replacement.as_str()).into_value(tag))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::ShellError;
-    use super::{action, Replace, SubCommand};
-    use nu_source::Tag;
-    use nu_test_support::value::string;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(SubCommand {})?)
-    }
-
-    #[test]
-    fn sets() {
-        let word = string("andres");
-        let expected = string("robalino");
-
-        let set_options = Replace(String::from("robalino"));
-
-        let actual = action(&word, &set_options, Tag::unknown()).unwrap();
-        assert_eq!(actual, expected);
-    }
-}
--- a/crates/nu-cli/src/commands/to_md.rs
+++ b/crates/nu-cli/src/commands/to_md.rs
@ -1,220 +0,0 @@
-use crate::commands::WholeStreamCommand;
-use crate::prelude::*;
-use futures::StreamExt;
-use nu_data::value::format_leaf;
-use nu_errors::ShellError;
-use nu_protocol::{ReturnSuccess, Signature, UntaggedValue, Value};
-
-pub struct ToMarkdown;
-
-#[derive(Deserialize)]
-pub struct ToMarkdownArgs {
-    pretty: bool,
-}
-
-#[async_trait]
-impl WholeStreamCommand for ToMarkdown {
-    fn name(&self) -> &str {
-        "to md"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("to md").switch(
-            "pretty",
-            "Formats the Markdown table to vertically align items",
-            Some('p'),
-        )
-    }
-
-    fn usage(&self) -> &str {
-        "Convert table into simple Markdown"
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        to_md(args, registry).await
-    }
-
-    fn examples(&self) -> Vec<Example> {
-        vec![
-            Example {
-                description: "Outputs an unformatted md string representing the contents of ls",
-                example: "ls | to md",
-                result: None,
-            },
-            Example {
-                description: "Outputs a formatted md string representing the contents of ls",
-                example: "ls | to md -p",
-                result: None,
-            },
-        ]
-    }
-}
-
-async fn to_md(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-    let name_tag = args.call_info.name_tag.clone();
-    let (ToMarkdownArgs { pretty }, input) = args.process(&registry).await?;
-    let input: Vec<Value> = input.collect().await;
-    let headers = nu_protocol::merge_descriptors(&input);
-
-    let mut escaped_headers: Vec<String> = Vec::new();
-    let mut column_widths: Vec<usize> = Vec::new();
-
-    if !headers.is_empty() && (headers.len() > 1 || headers[0] != "") {
-        for header in &headers {
-            let escaped_header_string = htmlescape::encode_minimal(&header);
-            column_widths.push(escaped_header_string.len());
-            escaped_headers.push(escaped_header_string);
-        }
-    } else {
-        column_widths = vec![0; headers.len()]
-    }
-
-    let mut escaped_rows: Vec<Vec<String>> = Vec::new();
-
-    for row in &input {
-        let mut escaped_row: Vec<String> = Vec::new();
-
-        match row.value.clone() {
-            UntaggedValue::Row(row) => {
-                for i in 0..headers.len() {
-                    let data = row.get_data(&headers[i]);
-                    let value_string = format_leaf(data.borrow()).plain_string(100_000);
-                    let new_column_width = value_string.len();
-
-                    escaped_row.push(value_string);
-
-                    if column_widths[i] < new_column_width {
-                        column_widths[i] = new_column_width;
-                    }
-                }
-            }
-            p => {
-                let value_string =
-                    htmlescape::encode_minimal(&format_leaf(&p).plain_string(100_000));
-                escaped_row.push(value_string);
-            }
-        }
-
-        escaped_rows.push(escaped_row);
-    }
-
-    let output_string = if (column_widths.is_empty() || column_widths.iter().all(|x| *x == 0))
-        && escaped_rows.is_empty()
-    {
-        String::from("")
-    } else {
-        get_output_string(&escaped_headers, &escaped_rows, &column_widths, pretty)
-            .trim()
-            .to_string()
-    };
-
-    Ok(OutputStream::one(ReturnSuccess::value(
-        UntaggedValue::string(output_string).into_value(name_tag),
-    )))
-}
-
-fn get_output_string(
-    headers: &[String],
-    rows: &[Vec<String>],
-    column_widths: &[usize],
-    pretty: bool,
-) -> String {
-    let mut output_string = String::new();
-
-    if !headers.is_empty() {
-        output_string.push('|');
-
-        for i in 0..headers.len() {
-            if pretty {
-                output_string.push(' ');
-                output_string.push_str(&get_padded_string(
-                    headers[i].clone(),
-                    column_widths[i],
-                    ' ',
-                ));
-                output_string.push(' ');
-            } else {
-                output_string.push_str(headers[i].as_str());
-            }
-
-            output_string.push('|');
-        }
-
-        output_string.push_str("\n|");
-
-        #[allow(clippy::needless_range_loop)]
-        for i in 0..headers.len() {
-            if pretty {
-                output_string.push(' ');
-                output_string.push_str(&get_padded_string(
-                    String::from("-"),
-                    column_widths[i],
-                    '-',
-                ));
-                output_string.push(' ');
-            } else {
-                output_string.push('-');
-            }
-
-            output_string.push('|');
-        }
-
-        output_string.push('\n');
-    }
-
-    for row in rows {
-        if !headers.is_empty() {
-            output_string.push('|');
-        }
-
-        for i in 0..row.len() {
-            if pretty {
-                output_string.push(' ');
-                output_string.push_str(&get_padded_string(row[i].clone(), column_widths[i], ' '));
-                output_string.push(' ');
-            } else {
-                output_string.push_str(row[i].as_str());
-            }
-
-            if !headers.is_empty() {
-                output_string.push('|');
-            }
-        }
-
-        output_string.push('\n');
-    }
-
-    output_string
-}
-
-fn get_padded_string(text: String, desired_length: usize, padding_character: char) -> String {
-    let repeat_length = if text.len() > desired_length {
-        0
-    } else {
-        desired_length - text.len()
-    };
-
-    format!(
-        "{}{}",
-        text,
-        padding_character.to_string().repeat(repeat_length)
-    )
-}
-
-#[cfg(test)]
-mod tests {
-    use super::ShellError;
-    use super::ToMarkdown;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(ToMarkdown {})?)
-    }
-}
--- a/crates/nu-cli/src/commands/version.rs
+++ b/crates/nu-cli/src/commands/version.rs
@ -1,96 +0,0 @@
-use crate::commands::WholeStreamCommand;
-use crate::prelude::*;
-use indexmap::IndexMap;
-use nu_data::TaggedListBuilder;
-use nu_errors::ShellError;
-use nu_protocol::{Dictionary, Signature, UntaggedValue};
-
-const GIT_COMMIT_HASH: &str = include_str!(concat!(env!("OUT_DIR"), "/git_commit_hash"));
-
-pub struct Version;
-
-#[async_trait]
-impl WholeStreamCommand for Version {
-    fn name(&self) -> &str {
-        "version"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("version")
-    }
-
-    fn usage(&self) -> &str {
-        "Display Nu version"
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        version(args, registry)
-    }
-
-    fn examples(&self) -> Vec<Example> {
-        vec![Example {
-            description: "Display Nu version",
-            example: "version",
-            result: None,
-        }]
-    }
-}
-
-pub fn version(args: CommandArgs, _registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
-    let tag = args.call_info.args.span;
-
-    let mut indexmap = IndexMap::with_capacity(4);
-
-    indexmap.insert(
-        "version".to_string(),
-        UntaggedValue::string(clap::crate_version!()).into_value(&tag),
-    );
-
-    let commit_hash = Some(GIT_COMMIT_HASH.trim()).filter(|x| !x.is_empty());
-    if let Some(commit_hash) = commit_hash {
-        indexmap.insert(
-            "commit_hash".to_string(),
-            UntaggedValue::string(commit_hash).into_value(&tag),
-        );
-    }
-
-    indexmap.insert("features".to_string(), features_enabled(&tag).into_value());
-
-    let value = UntaggedValue::Row(Dictionary::from(indexmap)).into_value(&tag);
-    Ok(OutputStream::one(value))
-}
-
-fn features_enabled(tag: impl Into<Tag>) -> TaggedListBuilder {
-    let mut names = TaggedListBuilder::new(tag);
-
-    names.push_untagged(UntaggedValue::string("default"));
-
-    #[cfg(feature = "clipboard-cli")]
-    {
-        names.push_untagged(UntaggedValue::string("clipboard"));
-    }
-
-    #[cfg(feature = "trash-support")]
-    {
-        names.push_untagged(UntaggedValue::string("trash"));
-    }
-
-    names
-}
-
-#[cfg(test)]
-mod tests {
-    use super::ShellError;
-    use super::Version;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(Version {})?)
-    }
-}
--- a/crates/nu-cli/src/commands/which_.rs
+++ b/crates/nu-cli/src/commands/which_.rs
@ -1,134 +0,0 @@
-use crate::commands::WholeStreamCommand;
-use crate::prelude::*;
-use indexmap::map::IndexMap;
-use nu_errors::ShellError;
-use nu_protocol::{Primitive, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
-use nu_source::Tagged;
-
-pub struct Which;
-
-#[async_trait]
-impl WholeStreamCommand for Which {
-    fn name(&self) -> &str {
-        "which"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("which")
-            .required("application", SyntaxShape::String, "application")
-            .switch("all", "list all executables", Some('a'))
-    }
-
-    fn usage(&self) -> &str {
-        "Finds a program file."
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        which(args, registry).await
-    }
-}
-
-/// Shortcuts for creating an entry to the output table
-fn entry(arg: impl Into<String>, path: Value, builtin: bool, tag: Tag) -> Value {
-    let mut map = IndexMap::new();
-    map.insert(
-        "arg".to_string(),
-        UntaggedValue::Primitive(Primitive::String(arg.into())).into_value(tag.clone()),
-    );
-    map.insert("path".to_string(), path);
-    map.insert(
-        "builtin".to_string(),
-        UntaggedValue::boolean(builtin).into_value(tag.clone()),
-    );
-
-    UntaggedValue::row(map).into_value(tag)
-}
-
-macro_rules! entry_builtin {
-    ($arg:expr, $tag:expr) => {
-        entry(
-            $arg.clone(),
-            UntaggedValue::Primitive(Primitive::String("nushell built-in command".to_string()))
-                .into_value($tag.clone()),
-            true,
-            $tag,
-        )
-    };
-}
-
-#[allow(unused)]
-macro_rules! entry_path {
-    ($arg:expr, $path:expr, $tag:expr) => {
-        entry(
-            $arg.clone(),
-            UntaggedValue::Primitive(Primitive::Path($path)).into_value($tag.clone()),
-            false,
-            $tag,
-        )
-    };
-}
-
-#[derive(Deserialize, Debug)]
-struct WhichArgs {
-    application: Tagged<String>,
-    all: bool,
-}
-
-async fn which(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-
-    let mut output = vec![];
-
-    let (WhichArgs { application, all }, _) = args.process(&registry).await?;
-    let external = application.starts_with('^');
-    let item = if external {
-        application.item[1..].to_string()
-    } else {
-        application.item.clone()
-    };
-    if !external {
-        let builtin = registry.has(&item);
-        if builtin {
-            output.push(ReturnSuccess::value(entry_builtin!(
-                item,
-                application.tag.clone()
-            )));
-        }
-    }
-
-    #[cfg(feature = "ichwh")]
-    {
-        if let Ok(paths) = ichwh::which_all(&item).await {
-            for path in paths {
-                output.push(ReturnSuccess::value(entry_path!(
-                    item,
-                    path.into(),
-                    application.tag.clone()
-                )));
-            }
-        }
-    }
-
-    if all {
-        Ok(futures::stream::iter(output.into_iter()).to_output_stream())
-    } else {
-        Ok(futures::stream::iter(output.into_iter().take(1)).to_output_stream())
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::ShellError;
-    use super::Which;
-
-    #[test]
-    fn examples_work_as_expected() -> Result<(), ShellError> {
-        use crate::examples::test as test_examples;
-
-        Ok(test_examples(Which {})?)
-    }
-}
--- a/crates/nu-cli/src/completion/command.rs
+++ b/crates/nu-cli/src/completion/command.rs
@ -5,7 +5,7 @@ use indexmap::set::IndexSet;

 use super::matchers::Matcher;
 use crate::completion::{Completer, CompletionContext, Suggestion};
-use crate::evaluation_context::EvaluationContext;
+use nu_engine::EvaluationContext;

 pub struct CommandCompleter;

@ -17,7 +17,7 @@ impl Completer for CommandCompleter {
        matcher: &dyn Matcher,
    ) -> Vec<Suggestion> {
        let context: &EvaluationContext = ctx.as_ref();
-        let mut commands: IndexSet<String> = IndexSet::from_iter(context.registry.names());
+        let mut commands: IndexSet<String> = IndexSet::from_iter(context.scope.get_command_names());

        // Command suggestions can come from three possible sets:
        //   1. internal command names,
@ -38,7 +38,7 @@ impl Completer for CommandCompleter {
            })
            .collect();

-        if partial != "" {
+        if !partial.is_empty() {
            let path_completer = crate::completion::path::PathCompleter;
            let path_results = path_completer.path_suggestions(partial, matcher);
            let iter = path_results.into_iter().filter_map(|path_suggestion| {
--- a/crates/nu-cli/src/completion/engine.rs
+++ b/crates/nu-cli/src/completion/engine.rs
@ -138,7 +138,7 @@ impl<'s> Flatten<'s> {
        result
    }

-    fn pipeline(&self, pipeline: &Commands) -> Vec<CompletionLocation> {
+    fn pipeline(&self, pipeline: &Pipeline) -> Vec<CompletionLocation> {
        let mut result = Vec::new();

        for command in &pipeline.list {
@ -158,7 +158,11 @@ impl<'s> Flatten<'s> {

    /// Flattens the block into a Vec of completion locations
    pub fn completion_locations(&self, block: &Block) -> Vec<CompletionLocation> {
-        block.block.iter().flat_map(|v| self.pipeline(v)).collect()
+        block
+            .block
+            .iter()
+            .flat_map(|g| g.pipelines.iter().flat_map(|v| self.pipeline(v)))
+            .collect()
    }

    pub fn new(line: &'s str) -> Flatten<'s> {
@ -252,7 +256,7 @@ pub fn completion_location(line: &str, block: &Block, pos: usize) -> Vec<Complet
 mod tests {
    use super::*;

-    use nu_parser::SignatureRegistry;
+    use nu_parser::{classify_block, lex, parse_block, ParserScope};
    use nu_protocol::{Signature, SyntaxShape};

    #[derive(Clone, Debug)]
@ -264,35 +268,52 @@ mod tests {
        }
    }

-    impl SignatureRegistry for VecRegistry {
-        fn has(&self, name: &str) -> bool {
+    impl ParserScope for VecRegistry {
+        fn has_signature(&self, name: &str) -> bool {
            self.0.iter().any(|v| v.name == name)
        }

-        fn get(&self, name: &str) -> Option<nu_protocol::Signature> {
+        fn get_signature(&self, name: &str) -> Option<nu_protocol::Signature> {
            self.0.iter().find(|v| v.name == name).map(Clone::clone)
        }

-        fn clone_box(&self) -> Box<dyn SignatureRegistry> {
-            Box::new(self.clone())
+        fn get_alias(&self, _name: &str) -> Option<Vec<Spanned<String>>> {
+            None
        }
+
+        fn add_alias(&self, _name: &str, _replacement: Vec<Spanned<String>>) {
+            todo!()
+        }
+
+        fn add_definition(&self, _block: Block) {}
+
+        fn get_definitions(&self) -> Vec<Block> {
+            vec![]
+        }
+
+        fn enter_scope(&self) {}
+
+        fn exit_scope(&self) {}
    }

    mod completion_location {
        use super::*;

-        use nu_parser::{classify_block, lite_parse, SignatureRegistry};
+        use nu_parser::ParserScope;

        fn completion_location(
            line: &str,
-            registry: &dyn SignatureRegistry,
+            scope: &dyn ParserScope,
            pos: usize,
        ) -> Vec<LocationType> {
-            let (lite_block, _) = lite_parse(line, 0);
+            let (tokens, _) = lex(line, 0);
+            let (lite_block, _) = parse_block(tokens);

-            let block = classify_block(&lite_block, registry);
+            scope.enter_scope();
+            let (block, _) = classify_block(&lite_block, scope);
+            scope.exit_scope();

-            super::completion_location(line, &block.block, pos)
+            super::completion_location(line, &block, pos)
                .into_iter()
                .map(|v| v.item)
                .collect()
--- a/crates/nu-cli/src/completion/flag.rs
+++ b/crates/nu-cli/src/completion/flag.rs
@ -1,6 +1,6 @@
 use super::matchers::Matcher;
 use crate::completion::{Completer, CompletionContext, Suggestion};
-use crate::evaluation_context::EvaluationContext;
+use nu_engine::EvaluationContext;

 pub struct FlagCompleter {
    pub(crate) cmd: String,
@ -15,7 +15,7 @@ impl Completer for FlagCompleter {
    ) -> Vec<Suggestion> {
        let context: &EvaluationContext = ctx.as_ref();

-        if let Some(cmd) = context.registry.get_command(&self.cmd) {
+        if let Some(cmd) = context.scope.get_command(&self.cmd) {
            let sig = cmd.signature();
            let mut suggestions = Vec::new();
            for (name, (named_type, _desc)) in sig.named.iter() {
--- a/crates/nu-cli/src/completion/mod.rs
+++ b/crates/nu-cli/src/completion/mod.rs
@ -4,8 +4,8 @@ pub(crate) mod flag;
 pub(crate) mod matchers;
 pub(crate) mod path;

-use crate::evaluation_context::EvaluationContext;
 use matchers::Matcher;
+use nu_engine::EvaluationContext;

 #[derive(Debug, Eq, PartialEq)]
 pub struct Suggestion {
--- a/crates/nu-cli/src/completion/path.rs
+++ b/crates/nu-cli/src/completion/path.rs
@ -22,14 +22,14 @@ impl PathCompleter {
            None => ("", expanded),
        };

-        let base_dir = if base_dir_name == "" {
+        let base_dir = if base_dir_name.is_empty() {
            PathBuf::from(".")
        } else {
            #[cfg(feature = "directories")]
            {
                let home_prefix = format!("~{}", SEP);
                if base_dir_name.starts_with(&home_prefix) {
-                    let mut home_dir = dirs::home_dir().unwrap_or_else(|| PathBuf::from("~"));
+                    let mut home_dir = dirs_next::home_dir().unwrap_or_else(|| PathBuf::from("~"));
                    home_dir.push(&base_dir_name[2..]);
                    home_dir
                } else {
--- a/crates/nu-cli/src/env.rs
+++ b/crates/nu-cli/src/env.rs
@ -1,6 +1,3 @@
 pub(crate) mod directory_specific_environment;
 pub(crate) mod environment;
 pub(crate) mod environment_syncer;
-pub(crate) mod host;
-
-pub(crate) use self::host::Host;
--- a/crates/nu-cli/src/env/directory_specific_environment.rs
+++ b/crates/nu-cli/src/env/directory_specific_environment.rs
@ -1,6 +1,5 @@
-use crate::commands;
-use commands::autoenv;
 use indexmap::{IndexMap, IndexSet};
+use nu_command::commands::autoenv;
 use nu_errors::ShellError;
 use serde::Deserialize;
 use std::env::*;
@ -52,7 +51,7 @@ impl DirectorySpecificEnvironment {
        }
    }

-    fn toml_if_trusted(&mut self, nu_env_file: &PathBuf) -> Result<NuEnvDoc, ShellError> {
+    fn toml_if_trusted(&mut self, nu_env_file: &Path) -> Result<NuEnvDoc, ShellError> {
        let content = std::fs::read(&nu_env_file)?;

        if autoenv::file_is_trusted(&nu_env_file, &content)? {
@ -162,7 +161,7 @@ impl DirectorySpecificEnvironment {
    pub fn maybe_add_key(
        &mut self,
        seen_vars: &mut IndexSet<EnvKey>,
-        dir: &PathBuf,
+        dir: &Path,
        key: &str,
        val: &str,
    ) {
@ -170,7 +169,7 @@ impl DirectorySpecificEnvironment {
        if !seen_vars.contains(key) {
            seen_vars.insert(key.to_string());
            self.added_vars
-                .entry(dir.clone())
+                .entry(PathBuf::from(dir))
                .or_insert(IndexMap::new())
                .insert(key.to_string(), var_os(key));

--- a/crates/nu-cli/src/env/environment.rs
+++ b/crates/nu-cli/src/env/environment.rs
@ -1,38 +1,9 @@
 use crate::env::directory_specific_environment::*;
 use indexmap::{indexmap, IndexSet};
 use nu_data::config::Conf;
+use nu_engine::Env;
 use nu_errors::ShellError;
 use nu_protocol::{UntaggedValue, Value};
-use std::env::*;
-use std::ffi::OsString;
-
-use std::fmt::Debug;
-
-pub trait Env: Debug + Send {
-    fn env(&self) -> Option<Value>;
-    fn path(&self) -> Option<Value>;
-
-    fn add_env(&mut self, key: &str, value: &str);
-    fn add_path(&mut self, new_path: OsString);
-}
-
-impl Env for Box<dyn Env> {
-    fn env(&self) -> Option<Value> {
-        (**self).env()
-    }
-
-    fn path(&self) -> Option<Value> {
-        (**self).path()
-    }
-
-    fn add_env(&mut self, key: &str, value: &str) {
-        (**self).add_env(key, value);
-    }
-
-    fn add_path(&mut self, new_path: OsString) {
-        (**self).add_path(new_path);
-    }
-}

 #[derive(Debug, Default)]
 pub struct Environment {
@ -128,7 +99,7 @@ impl Env for Environment {
            {
                let mut new_paths = current_paths.clone();

-                let new_path_candidates = split_paths(&paths).map(|path| {
+                let new_path_candidates = std::env::split_paths(&paths).map(|path| {
                    UntaggedValue::string(path.to_string_lossy()).into_value(tag.clone())
                });

--- a/crates/nu-cli/src/env/environment_syncer.rs
+++ b/crates/nu-cli/src/env/environment_syncer.rs
@ -1,9 +1,10 @@
-use crate::env::environment::{Env, Environment};
-use crate::evaluation_context::EvaluationContext;
+use crate::env::environment::Environment;
 use nu_data::config::{Conf, NuConfig};
+use nu_engine::Env;
+use nu_engine::EvaluationContext;
 use nu_errors::ShellError;
 use parking_lot::Mutex;
-use std::sync::Arc;
+use std::sync::{atomic::Ordering, Arc};

 pub struct EnvironmentSyncer {
    pub env: Arc<Mutex<Box<Environment>>>,
@ -63,8 +64,12 @@ impl EnvironmentSyncer {

    pub fn autoenv(&self, ctx: &mut EvaluationContext) -> Result<(), ShellError> {
        let mut environment = self.env.lock();
-        let auto = environment.autoenv(ctx.user_recently_used_autoenv_untrust);
-        ctx.user_recently_used_autoenv_untrust = false;
+        let recently_used = ctx
+            .user_recently_used_autoenv_untrust
+            .load(Ordering::SeqCst);
+        let auto = environment.autoenv(recently_used);
+        ctx.user_recently_used_autoenv_untrust
+            .store(false, Ordering::SeqCst);
        auto
    }

@ -90,9 +95,11 @@ impl EnvironmentSyncer {
                        ctx.with_host(|host| {
                            host.env_set(
                                std::ffi::OsString::from(var.0),
-                                std::ffi::OsString::from(string),
+                                std::ffi::OsString::from(&string),
                            )
                        });
+
+                        ctx.scope.add_env_var_to_base(var.0, string);
                    }
                }
            }
@ -123,8 +130,14 @@ impl EnvironmentSyncer {

                if let Ok(paths_ready) = prepared {
                    ctx.with_host(|host| {
-                        host.env_set(std::ffi::OsString::from("PATH"), paths_ready);
+                        host.env_set(
+                            std::ffi::OsString::from("PATH"),
+                            std::ffi::OsString::from(&paths_ready),
+                        );
                    });
+
+                    ctx.scope
+                        .add_env_var_to_base("PATH", paths_ready.to_string_lossy().to_string());
                }
            }
        }
@ -148,10 +161,10 @@ impl EnvironmentSyncer {
 #[cfg(test)]
 mod tests {
    use super::EnvironmentSyncer;
-    use crate::env::environment::Env;
-    use crate::evaluation_context::EvaluationContext;
    use indexmap::IndexMap;
    use nu_data::config::tests::FakeConfig;
+    use nu_engine::basic_evaluation_context;
+    use nu_engine::Env;
    use nu_errors::ShellError;
    use nu_test_support::fs::Stub::FileWithContent;
    use nu_test_support::playground::Playground;
@ -166,8 +179,8 @@ mod tests {
    #[test]
    fn syncs_env_if_new_env_entry_is_added_to_an_existing_configuration() -> Result<(), ShellError>
    {
-        let mut ctx = EvaluationContext::basic()?;
-        ctx.host = Arc::new(Mutex::new(Box::new(crate::env::host::FakeHost::new())));
+        let mut ctx = basic_evaluation_context()?;
+        ctx.host = Arc::new(Mutex::new(Box::new(nu_engine::FakeHost::new())));

        let mut expected = IndexMap::new();
        expected.insert(
@ -198,7 +211,7 @@ mod tests {
            let new_file = dirs.test().join("updated_configuration.toml");

            let fake_config = FakeConfig::new(&file);
-            let mut actual = EnvironmentSyncer::with_config(Box::new(fake_config.clone()));
+            let mut actual = EnvironmentSyncer::with_config(Box::new(fake_config));

            // Here, the environment variables from the current session
            // are cleared since we will load and set them from the
@ -269,8 +282,8 @@ mod tests {
    #[test]
    fn syncs_env_if_new_env_entry_in_session_is_not_in_configuration_file() -> Result<(), ShellError>
    {
-        let mut ctx = EvaluationContext::basic()?;
-        ctx.host = Arc::new(Mutex::new(Box::new(crate::env::host::FakeHost::new())));
+        let mut ctx = basic_evaluation_context()?;
+        ctx.host = Arc::new(Mutex::new(Box::new(nu_engine::FakeHost::new())));

        let mut expected = IndexMap::new();
        expected.insert(
@ -368,8 +381,8 @@ mod tests {

    #[test]
    fn nu_envs_have_higher_priority_and_does_not_get_overwritten() -> Result<(), ShellError> {
-        let mut ctx = EvaluationContext::basic()?;
-        ctx.host = Arc::new(Mutex::new(Box::new(crate::env::host::FakeHost::new())));
+        let mut ctx = basic_evaluation_context()?;
+        ctx.host = Arc::new(Mutex::new(Box::new(nu_engine::FakeHost::new())));

        let mut expected = IndexMap::new();
        expected.insert(
@ -444,8 +457,8 @@ mod tests {
    #[test]
    fn syncs_path_if_new_path_entry_in_session_is_not_in_configuration_file(
    ) -> Result<(), ShellError> {
-        let mut ctx = EvaluationContext::basic()?;
-        ctx.host = Arc::new(Mutex::new(Box::new(crate::env::host::FakeHost::new())));
+        let mut ctx = basic_evaluation_context()?;
+        ctx.host = Arc::new(Mutex::new(Box::new(nu_engine::FakeHost::new())));

        let expected = std::env::join_paths(vec![
            PathBuf::from("/Users/andresrobalino/.volta/bin"),
@ -531,8 +544,8 @@ mod tests {
    #[test]
    fn nu_paths_have_higher_priority_and_new_paths_get_appended_to_the_end(
    ) -> Result<(), ShellError> {
-        let mut ctx = EvaluationContext::basic()?;
-        ctx.host = Arc::new(Mutex::new(Box::new(crate::env::host::FakeHost::new())));
+        let mut ctx = basic_evaluation_context()?;
+        ctx.host = Arc::new(Mutex::new(Box::new(nu_engine::FakeHost::new())));

        let expected = std::env::join_paths(vec![
            PathBuf::from("/Users/andresrobalino/.volta/bin"),
--- a/crates/nu-cli/src/evaluation_context.rs
+++ b/crates/nu-cli/src/evaluation_context.rs
@ -1,195 +0,0 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::{command::CommandArgs, Command, UnevaluatedCallInfo};
-use crate::env::host::Host;
-use crate::shell::shell_manager::ShellManager;
-use crate::stream::{InputStream, OutputStream};
-use indexmap::IndexMap;
-use nu_errors::ShellError;
-use nu_protocol::{hir, Scope};
-use nu_source::{Tag, Text};
-use parking_lot::Mutex;
-use std::error::Error;
-use std::sync::atomic::AtomicBool;
-use std::sync::Arc;
-
-#[derive(Clone)]
-pub struct EvaluationContext {
-    pub registry: CommandRegistry,
-    pub host: Arc<parking_lot::Mutex<Box<dyn Host>>>,
-    pub current_errors: Arc<Mutex<Vec<ShellError>>>,
-    pub ctrl_c: Arc<AtomicBool>,
-    pub raw_input: String,
-    pub user_recently_used_autoenv_untrust: bool,
-    pub(crate) shell_manager: ShellManager,
-
-    /// Windows-specific: keep track of previous cwd on each drive
-    pub windows_drives_previous_cwd: Arc<Mutex<std::collections::HashMap<String, String>>>,
-}
-
-impl EvaluationContext {
-    pub(crate) fn registry(&self) -> &CommandRegistry {
-        &self.registry
-    }
-
-    pub(crate) fn from_raw(
-        raw_args: &CommandArgs,
-        registry: &CommandRegistry,
-    ) -> EvaluationContext {
-        EvaluationContext {
-            registry: registry.clone(),
-            host: raw_args.host.clone(),
-            current_errors: raw_args.current_errors.clone(),
-            ctrl_c: raw_args.ctrl_c.clone(),
-            shell_manager: raw_args.shell_manager.clone(),
-            user_recently_used_autoenv_untrust: false,
-            windows_drives_previous_cwd: Arc::new(Mutex::new(std::collections::HashMap::new())),
-            raw_input: String::default(),
-        }
-    }
-
-    pub(crate) fn from_args(args: &CommandArgs, registry: &CommandRegistry) -> EvaluationContext {
-        EvaluationContext {
-            registry: registry.clone(),
-            host: args.host.clone(),
-            current_errors: args.current_errors.clone(),
-            ctrl_c: args.ctrl_c.clone(),
-            shell_manager: args.shell_manager.clone(),
-            user_recently_used_autoenv_untrust: false,
-            windows_drives_previous_cwd: Arc::new(Mutex::new(std::collections::HashMap::new())),
-            raw_input: String::default(),
-        }
-    }
-
-    pub fn basic() -> Result<EvaluationContext, Box<dyn Error>> {
-        let registry = CommandRegistry::new();
-
-        Ok(EvaluationContext {
-            registry,
-            host: Arc::new(parking_lot::Mutex::new(Box::new(
-                crate::env::host::BasicHost,
-            ))),
-            current_errors: Arc::new(Mutex::new(vec![])),
-            ctrl_c: Arc::new(AtomicBool::new(false)),
-            user_recently_used_autoenv_untrust: false,
-            shell_manager: ShellManager::basic()?,
-            windows_drives_previous_cwd: Arc::new(Mutex::new(std::collections::HashMap::new())),
-            raw_input: String::default(),
-        })
-    }
-
-    pub(crate) fn error(&mut self, error: ShellError) {
-        self.with_errors(|errors| errors.push(error))
-    }
-
-    pub(crate) fn clear_errors(&mut self) {
-        self.current_errors.lock().clear()
-    }
-
-    pub(crate) fn get_errors(&self) -> Vec<ShellError> {
-        self.current_errors.lock().clone()
-    }
-
-    pub(crate) fn add_error(&self, err: ShellError) {
-        self.current_errors.lock().push(err);
-    }
-
-    pub(crate) fn maybe_print_errors(&mut self, source: Text) -> bool {
-        let errors = self.current_errors.clone();
-        let mut errors = errors.lock();
-
-        if errors.len() > 0 {
-            let error = errors[0].clone();
-            *errors = vec![];
-
-            crate::cli::print_err(error, &source);
-            true
-        } else {
-            false
-        }
-    }
-
-    pub(crate) fn configure<T>(
-        &mut self,
-        config: &dyn nu_data::config::Conf,
-        block: impl FnOnce(&dyn nu_data::config::Conf, &mut Self) -> T,
-    ) {
-        block(config, &mut *self);
-    }
-
-    pub(crate) fn with_host<T>(&mut self, block: impl FnOnce(&mut dyn Host) -> T) -> T {
-        let mut host = self.host.lock();
-
-        block(&mut *host)
-    }
-
-    pub(crate) fn with_errors<T>(&mut self, block: impl FnOnce(&mut Vec<ShellError>) -> T) -> T {
-        let mut errors = self.current_errors.lock();
-
-        block(&mut *errors)
-    }
-
-    pub fn add_commands(&mut self, commands: Vec<Command>) {
-        for command in commands {
-            self.registry.insert(command.name().to_string(), command);
-        }
-    }
-
-    #[allow(unused)]
-    pub(crate) fn get_command(&self, name: &str) -> Option<Command> {
-        self.registry.get_command(name)
-    }
-
-    pub(crate) fn is_command_registered(&self, name: &str) -> bool {
-        self.registry.has(name)
-    }
-
-    pub(crate) fn expect_command(&self, name: &str) -> Result<Command, ShellError> {
-        self.registry.expect_command(name)
-    }
-
-    pub(crate) async fn run_command(
-        &mut self,
-        command: Command,
-        name_tag: Tag,
-        args: hir::Call,
-        scope: Arc<Scope>,
-        input: InputStream,
-    ) -> Result<OutputStream, ShellError> {
-        let command_args = self.command_args(args, input, name_tag, scope);
-        command.run(command_args, self.registry()).await
-    }
-
-    fn call_info(&self, args: hir::Call, name_tag: Tag, scope: Arc<Scope>) -> UnevaluatedCallInfo {
-        UnevaluatedCallInfo {
-            args,
-            name_tag,
-            scope,
-        }
-    }
-
-    fn command_args(
-        &self,
-        args: hir::Call,
-        input: InputStream,
-        name_tag: Tag,
-        scope: Arc<Scope>,
-    ) -> CommandArgs {
-        CommandArgs {
-            host: self.host.clone(),
-            ctrl_c: self.ctrl_c.clone(),
-            current_errors: self.current_errors.clone(),
-            shell_manager: self.shell_manager.clone(),
-            call_info: self.call_info(args, name_tag, scope),
-            input,
-            raw_input: self.raw_input.clone(),
-        }
-    }
-
-    pub fn get_env(&self) -> IndexMap<String, String> {
-        let mut output = IndexMap::new();
-        for (var, value) in self.host.lock().vars() {
-            output.insert(var, value);
-        }
-        output
-    }
-}
--- a/crates/nu-cli/src/examples.rs
+++ b/crates/nu-cli/src/examples.rs
@ -1,492 +0,0 @@
-use nu_errors::ShellError;
-use nu_protocol::hir::ClassifiedBlock;
-use nu_protocol::{
-    Primitive, ReturnSuccess, Scope, ShellTypeName, Signature, SyntaxShape, UntaggedValue, Value,
-};
-use nu_source::{AnchorLocation, TaggedItem};
-
-use crate::prelude::*;
-
-use num_bigint::BigInt;
-
-use crate::command_registry::CommandRegistry;
-use crate::commands::classified::block::run_block;
-use crate::commands::command::CommandArgs;
-use crate::commands::{
-    whole_stream_command, BuildString, Command, Each, Echo, First, Get, Keep, Last, Nth,
-    StrCollect, WholeStreamCommand, Wrap,
-};
-use crate::evaluation_context::EvaluationContext;
-use crate::stream::{InputStream, OutputStream};
-
-use async_trait::async_trait;
-use futures::executor::block_on;
-use serde::Deserialize;
-
-pub fn test_examples(cmd: Command) -> Result<(), ShellError> {
-    let examples = cmd.examples();
-
-    let mut base_context = EvaluationContext::basic()?;
-
-    base_context.add_commands(vec![
-        // Mocks
-        whole_stream_command(MockLs {}),
-        // Minimal restricted commands to aid in testing
-        whole_stream_command(Echo {}),
-        whole_stream_command(BuildString {}),
-        whole_stream_command(First {}),
-        whole_stream_command(Get {}),
-        whole_stream_command(Keep {}),
-        whole_stream_command(Each {}),
-        whole_stream_command(Last {}),
-        whole_stream_command(Nth {}),
-        whole_stream_command(StrCollect),
-        whole_stream_command(Wrap),
-        cmd,
-    ]);
-
-    for sample_pipeline in examples {
-        let mut ctx = base_context.clone();
-
-        let block = parse_line(sample_pipeline.example, &mut ctx)?;
-
-        if let Some(expected) = &sample_pipeline.result {
-            let result = block_on(evaluate_block(block, &mut ctx))?;
-
-            ctx.with_errors(|reasons| reasons.iter().cloned().take(1).next())
-                .map_or(Ok(()), Err)?;
-
-            if expected.len() != result.len() {
-                let rows_returned =
-                    format!("expected: {}\nactual: {}", expected.len(), result.len());
-                let failed_call = format!("command: {}\n", sample_pipeline.example);
-
-                panic!(
-                    "example command produced unexpected number of results.\n {} {}",
-                    failed_call, rows_returned
-                );
-            }
-
-            for (e, a) in expected.iter().zip(result.iter()) {
-                if !values_equal(e, a) {
-                    let row_errored = format!("expected: {:#?}\nactual: {:#?}", e, a);
-                    let failed_call = format!("command: {}\n", sample_pipeline.example);
-
-                    panic!(
-                        "example command produced unexpected result.\n {} {}",
-                        failed_call, row_errored
-                    );
-                }
-            }
-        }
-    }
-
-    Ok(())
-}
-
-pub fn test(cmd: impl WholeStreamCommand + 'static) -> Result<(), ShellError> {
-    let examples = cmd.examples();
-
-    let mut base_context = EvaluationContext::basic()?;
-
-    base_context.add_commands(vec![
-        whole_stream_command(Echo {}),
-        whole_stream_command(BuildString {}),
-        whole_stream_command(Get {}),
-        whole_stream_command(Keep {}),
-        whole_stream_command(Each {}),
-        whole_stream_command(cmd),
-        whole_stream_command(StrCollect),
-        whole_stream_command(Wrap),
-    ]);
-
-    for sample_pipeline in examples {
-        let mut ctx = base_context.clone();
-
-        let block = parse_line(sample_pipeline.example, &mut ctx)?;
-
-        if let Some(expected) = &sample_pipeline.result {
-            let result = block_on(evaluate_block(block, &mut ctx))?;
-
-            ctx.with_errors(|reasons| reasons.iter().cloned().take(1).next())
-                .map_or(Ok(()), Err)?;
-
-            if expected.len() != result.len() {
-                let rows_returned =
-                    format!("expected: {}\nactual: {}", expected.len(), result.len());
-                let failed_call = format!("command: {}\n", sample_pipeline.example);
-
-                panic!(
-                    "example command produced unexpected number of results.\n {} {}",
-                    failed_call, rows_returned
-                );
-            }
-
-            for (e, a) in expected.iter().zip(result.iter()) {
-                if !values_equal(e, a) {
-                    let row_errored = format!("expected: {:#?}\nactual: {:#?}", e, a);
-                    let failed_call = format!("command: {}\n", sample_pipeline.example);
-
-                    panic!(
-                        "example command produced unexpected result.\n {} {}",
-                        failed_call, row_errored
-                    );
-                }
-            }
-        }
-    }
-
-    Ok(())
-}
-
-pub fn test_anchors(cmd: Command) -> Result<(), ShellError> {
-    let examples = cmd.examples();
-
-    let mut base_context = EvaluationContext::basic()?;
-
-    base_context.add_commands(vec![
-        // Minimal restricted commands to aid in testing
-        whole_stream_command(MockCommand {}),
-        whole_stream_command(MockEcho {}),
-        whole_stream_command(MockLs {}),
-        whole_stream_command(BuildString {}),
-        whole_stream_command(First {}),
-        whole_stream_command(Get {}),
-        whole_stream_command(Keep {}),
-        whole_stream_command(Each {}),
-        whole_stream_command(Last {}),
-        whole_stream_command(Nth {}),
-        whole_stream_command(StrCollect),
-        whole_stream_command(Wrap),
-        cmd,
-    ]);
-
-    for sample_pipeline in examples {
-        let pipeline_with_anchor = format!("mock --open --path | {}", sample_pipeline.example);
-
-        let mut ctx = base_context.clone();
-
-        let block = parse_line(&pipeline_with_anchor, &mut ctx)?;
-        let result = block_on(evaluate_block(block, &mut ctx))?;
-
-        ctx.with_errors(|reasons| reasons.iter().cloned().take(1).next())
-            .map_or(Ok(()), Err)?;
-
-        for actual in result.iter() {
-            if !is_anchor_carried(actual, mock_path()) {
-                let failed_call = format!("command: {}\n", pipeline_with_anchor);
-
-                panic!(
-                    "example command didn't carry anchor tag correctly.\n {} {:#?} {:#?}",
-                    failed_call,
-                    actual,
-                    mock_path()
-                );
-            }
-        }
-    }
-
-    Ok(())
-}
-
-/// Parse and run a nushell pipeline
-fn parse_line(line: &str, ctx: &mut EvaluationContext) -> Result<ClassifiedBlock, ShellError> {
-    let line = if let Some(line) = line.strip_suffix('\n') {
-        line
-    } else {
-        line
-    };
-
-    let (lite_result, err) = nu_parser::lite_parse(&line, 0);
-    if let Some(err) = err {
-        return Err(err.into());
-    }
-
-    // TODO ensure the command whose examples we're testing is actually in the pipeline
-    let classified_block = nu_parser::classify_block(&lite_result, ctx.registry());
-    Ok(classified_block)
-}
-
-async fn evaluate_block(
-    block: ClassifiedBlock,
-    ctx: &mut EvaluationContext,
-) -> Result<Vec<Value>, ShellError> {
-    let input_stream = InputStream::empty();
-    let env = ctx.get_env();
-
-    let scope = Scope::from_env(env);
-
-    Ok(run_block(&block.block, ctx, input_stream, scope)
-        .await?
-        .drain_vec()
-        .await)
-}
-
-// TODO probably something already available to do this
-// TODO perhaps better panic messages when things don't compare
-
-// Deep value comparisons that ignore tags
-fn values_equal(expected: &Value, actual: &Value) -> bool {
-    use nu_protocol::UntaggedValue::*;
-
-    match (&expected.value, &actual.value) {
-        (Primitive(e), Primitive(a)) => e == a,
-        (Row(e), Row(a)) => {
-            if e.entries.len() != a.entries.len() {
-                return false;
-            }
-
-            e.entries
-                .iter()
-                .zip(a.entries.iter())
-                .all(|((ek, ev), (ak, av))| ek == ak && values_equal(ev, av))
-        }
-        (Table(e), Table(a)) => e.iter().zip(a.iter()).all(|(e, a)| values_equal(e, a)),
-        (e, a) => unimplemented!("{} {}", e.type_name(), a.type_name()),
-    }
-}
-
-fn is_anchor_carried(actual: &Value, anchor: AnchorLocation) -> bool {
-    actual.tag.anchor() == Some(anchor)
-}
-
-#[derive(Deserialize)]
-struct Arguments {
-    path: Option<bool>,
-    open: bool,
-}
-
-struct MockCommand;
-
-#[async_trait]
-impl WholeStreamCommand for MockCommand {
-    fn name(&self) -> &str {
-        "mock"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("mock")
-            .switch("open", "fake opening sources", Some('o'))
-            .switch("path", "file open", Some('p'))
-    }
-
-    fn usage(&self) -> &str {
-        "Generates tables and metadata that mimics behavior of real commands in controlled ways."
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        let name_tag = args.call_info.name_tag.clone();
-
-        let (
-            Arguments {
-                path: mocked_path,
-                open: open_mock,
-            },
-            _input,
-        ) = args.process(&registry).await?;
-
-        let out = UntaggedValue::string("Yehuda Katz in Ecuador");
-
-        if open_mock {
-            if let Some(true) = mocked_path {
-                return Ok(OutputStream::one(Ok(ReturnSuccess::Value(Value {
-                    value: out,
-                    tag: Tag {
-                        anchor: Some(mock_path()),
-                        span: name_tag.span,
-                    },
-                }))));
-            }
-        }
-
-        Ok(OutputStream::one(Ok(ReturnSuccess::Value(
-            out.into_value(name_tag),
-        ))))
-    }
-}
-
-struct MockEcho;
-
-#[derive(Deserialize)]
-struct MockEchoArgs {
-    pub rest: Vec<Value>,
-}
-
-#[async_trait]
-impl WholeStreamCommand for MockEcho {
-    fn name(&self) -> &str {
-        "echo"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("echo").rest(SyntaxShape::Any, "the values to echo")
-    }
-
-    fn usage(&self) -> &str {
-        "Mock echo."
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        let name_tag = args.call_info.name_tag.clone();
-        let (MockEchoArgs { rest }, input) = args.process(&registry).await?;
-
-        let mut base_value = UntaggedValue::string("Yehuda Katz in Ecuador").into_value(name_tag);
-        let input: Vec<Value> = input.collect().await;
-
-        if let Some(first) = input.get(0) {
-            base_value = first.clone()
-        }
-
-        let stream = rest.into_iter().map(move |i| {
-            let base_value = base_value.clone();
-            match i.as_string() {
-                Ok(s) => OutputStream::one(Ok(ReturnSuccess::Value(Value {
-                    value: UntaggedValue::Primitive(Primitive::String(s)),
-                    tag: base_value.tag,
-                }))),
-                _ => match i {
-                    Value {
-                        value: UntaggedValue::Table(table),
-                        ..
-                    } => {
-                        if table.len() == 1 && table[0].is_table() {
-                            let mut values: Vec<Value> =
-                                table[0].table_entries().map(Clone::clone).collect();
-
-                            for v in values.iter_mut() {
-                                v.tag = base_value.tag();
-                            }
-
-                            let subtable =
-                                vec![UntaggedValue::Table(values).into_value(base_value.tag())];
-
-                            futures::stream::iter(subtable.into_iter().map(ReturnSuccess::value))
-                                .to_output_stream()
-                        } else {
-                            futures::stream::iter(
-                                table
-                                    .into_iter()
-                                    .map(move |mut v| {
-                                        v.tag = base_value.tag();
-                                        v
-                                    })
-                                    .map(ReturnSuccess::value),
-                            )
-                            .to_output_stream()
-                        }
-                    }
-                    _ => OutputStream::one(Ok(ReturnSuccess::Value(Value {
-                        value: i.value.clone(),
-                        tag: base_value.tag,
-                    }))),
-                },
-            }
-        });
-
-        Ok(futures::stream::iter(stream).flatten().to_output_stream())
-    }
-}
-
-struct MockLs;
-
-#[async_trait]
-impl WholeStreamCommand for MockLs {
-    fn name(&self) -> &str {
-        "ls"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build("ls")
-    }
-
-    fn usage(&self) -> &str {
-        "Mock ls."
-    }
-
-    async fn run(
-        &self,
-        args: CommandArgs,
-        _: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        let name_tag = args.call_info.name_tag.clone();
-
-        let mut base_value =
-            UntaggedValue::string("Andrés N. Robalino in Portland").into_value(name_tag);
-        let input: Vec<Value> = args.input.collect().await;
-
-        if let Some(first) = input.get(0) {
-            base_value = first.clone()
-        }
-
-        Ok(futures::stream::iter(
-            file_listing()
-                .iter()
-                .map(|row| Value {
-                    value: row.value.clone(),
-                    tag: base_value.tag.clone(),
-                })
-                .collect::<Vec<_>>()
-                .into_iter()
-                .map(ReturnSuccess::value),
-        )
-        .to_output_stream())
-    }
-}
-
-fn int(s: impl Into<BigInt>) -> Value {
-    UntaggedValue::int(s).into_untagged_value()
-}
-
-fn string(input: impl Into<String>) -> Value {
-    UntaggedValue::string(input.into()).into_untagged_value()
-}
-
-fn date(input: impl Into<String>) -> Value {
-    let key = input.into().tagged_unknown();
-    crate::value::Date::naive_from_str(key.borrow_tagged())
-        .expect("date from string failed")
-        .into_untagged_value()
-}
-
-fn file_listing() -> Vec<Value> {
-    vec![
-        row! {
-               "name".to_string() => string("Andrés.txt"),
-               "type".to_string() =>       string("File"),
-           "chickens".to_string() =>              int(10),
-           "modified".to_string() =>   date("2019-07-23")
-        },
-        row! {
-               "name".to_string() =>   string("Jonathan"),
-               "type".to_string() =>        string("Dir"),
-           "chickens".to_string() =>               int(5),
-           "modified".to_string() =>   date("2019-07-23")
-        },
-        row! {
-               "name".to_string() =>  string("Andrés.txt"),
-               "type".to_string() =>        string("File"),
-           "chickens".to_string() =>               int(20),
-           "modified".to_string() =>    date("2019-09-24")
-        },
-        row! {
-               "name".to_string() =>      string("Yehuda"),
-               "type".to_string() =>         string("Dir"),
-           "chickens".to_string() =>                int(4),
-           "modified".to_string() =>    date("2019-09-24")
-        },
-    ]
-}
-
-fn mock_path() -> AnchorLocation {
-    let path = String::from("path/to/las_best_arepas_in_the_world.txt");
-
-    AnchorLocation::File(path)
-}
--- a/crates/nu-cli/src/git.rs
+++ b/crates/nu-cli/src/git.rs
@ -1,26 +0,0 @@
-pub fn current_branch() -> Option<String> {
-    #[cfg(feature = "git2")]
-    {
-        use git2::{Repository, RepositoryOpenFlags};
-        use std::ffi::OsString;
-
-        let v: Vec<OsString> = vec![];
-        match Repository::open_ext(".", RepositoryOpenFlags::empty(), v) {
-            Ok(repo) => {
-                let r = repo.head();
-                match r {
-                    Ok(r) => match r.shorthand() {
-                        Some(s) => Some(s.to_string()),
-                        None => None,
-                    },
-                    _ => None,
-                }
-            }
-            _ => None,
-        }
-    }
-    #[cfg(not(feature = "git2"))]
-    {
-        None
-    }
-}
--- a/crates/nu-cli/src/keybinding.rs
+++ b/crates/nu-cli/src/keybinding.rs
@ -405,14 +405,10 @@ pub struct Keybinding {

 type Keybindings = Vec<Keybinding>;

-pub(crate) fn keybinding_path() -> Result<std::path::PathBuf, nu_errors::ShellError> {
-    nu_data::config::default_path_for(&Some(std::path::PathBuf::from("keybindings.yml")))
-}
-
 pub(crate) fn load_keybindings(
    rl: &mut rustyline::Editor<crate::shell::Helper>,
 ) -> Result<(), nu_errors::ShellError> {
-    let filename = keybinding_path()?;
+    let filename = nu_data::keybinding::keybinding_path()?;
    let contents = std::fs::read_to_string(filename);

    // Silently fail if there is no file there
--- a/crates/nu-cli/src/lib.rs
+++ b/crates/nu-cli/src/lib.rs
@ -14,52 +14,28 @@ extern crate quickcheck;
 extern crate quickcheck_macros;

 mod cli;
-mod command_registry;
-mod commands;
 #[cfg(feature = "rustyline-support")]
 mod completion;
-mod deserializer;
-mod documentation;
 mod env;
-mod evaluate;
-mod evaluation_context;
 mod format;
-mod futures;
-#[cfg(feature = "rustyline-support")]
-mod git;
 #[cfg(feature = "rustyline-support")]
 mod keybinding;
-mod path;
-mod plugin;
+mod line_editor;
 mod shell;
-mod stream;
 pub mod types;
-pub mod utils;
-
-#[cfg(test)]
-mod examples;

 #[cfg(feature = "rustyline-support")]
 pub use crate::cli::cli;

-pub use crate::cli::{
-    create_default_context, parse_and_eval, process_line, register_plugins,
-    run_pipeline_standalone, run_vec_of_pipelines, LineResult,
-};
-pub use crate::command_registry::CommandRegistry;
-pub use crate::commands::command::{
-    whole_stream_command, CommandArgs, EvaluatedWholeStreamCommandArgs, Example, WholeStreamCommand,
-};
-pub use crate::commands::help::get_help;
+pub use crate::cli::{parse_and_eval, register_plugins, run_script_file};
+
 pub use crate::env::environment_syncer::EnvironmentSyncer;
-pub use crate::env::host::BasicHost;
-pub use crate::evaluation_context::EvaluationContext;
-pub use crate::prelude::ToOutputStream;
-pub use crate::stream::{InputStream, InterruptibleStream, OutputStream};
+pub use nu_command::commands::default_context::create_default_context;
 pub use nu_data::config;
 pub use nu_data::dict::TaggedListBuilder;
 pub use nu_data::primitive;
 pub use nu_data::value;
+pub use nu_stream::{InputStream, InterruptibleStream, OutputStream};
 pub use nu_value_ext::ValueExt;
 pub use num_traits::cast::ToPrimitive;

--- a/crates/nu-cli/src/line_editor.rs
+++ b/crates/nu-cli/src/line_editor.rs
@ -0,0 +1,234 @@
+use nu_engine::EvaluationContext;
+use std::error::Error;
+
+#[allow(unused_imports)]
+use crate::prelude::*;
+
+#[allow(unused_imports)]
+use nu_command::script::LineResult;
+
+#[cfg(feature = "rustyline-support")]
+use crate::shell::Helper;
+
+#[cfg(feature = "rustyline-support")]
+use rustyline::{
+    self,
+    config::Configurer,
+    config::{ColorMode, CompletionType, Config},
+    error::ReadlineError,
+    At, Cmd, Editor, KeyPress, Movement, Word,
+};
+
+#[cfg(feature = "rustyline-support")]
+pub fn convert_rustyline_result_to_string(input: Result<String, ReadlineError>) -> LineResult {
+    match input {
+        Ok(s) if s == "history -c" || s == "history --clear" => LineResult::ClearHistory,
+        Ok(s) => LineResult::Success(s),
+        Err(ReadlineError::Interrupted) => LineResult::CtrlC,
+        Err(ReadlineError::Eof) => LineResult::CtrlD,
+        Err(err) => {
+            outln!("Error: {:?}", err);
+            LineResult::Break
+        }
+    }
+}
+
+#[cfg(feature = "rustyline-support")]
+pub fn default_rustyline_editor_configuration() -> Editor<Helper> {
+    #[cfg(windows)]
+    const DEFAULT_COMPLETION_MODE: CompletionType = CompletionType::Circular;
+    #[cfg(not(windows))]
+    const DEFAULT_COMPLETION_MODE: CompletionType = CompletionType::List;
+
+    let config = Config::builder().color_mode(ColorMode::Forced).build();
+    let mut rl: Editor<_> = Editor::with_config(config);
+
+    // add key bindings to move over a whole word with Ctrl+ArrowLeft and Ctrl+ArrowRight
+    rl.bind_sequence(
+        KeyPress::ControlLeft,
+        Cmd::Move(Movement::BackwardWord(1, Word::Vi)),
+    );
+    rl.bind_sequence(
+        KeyPress::ControlRight,
+        Cmd::Move(Movement::ForwardWord(1, At::AfterEnd, Word::Vi)),
+    );
+
+    // workaround for multiline-paste hang in rustyline (see https://github.com/kkawakam/rustyline/issues/202)
+    rl.bind_sequence(KeyPress::BracketedPasteStart, rustyline::Cmd::Noop);
+
+    // Let's set the defaults up front and then override them later if the user indicates
+    // defaults taken from here https://github.com/kkawakam/rustyline/blob/2fe886c9576c1ea13ca0e5808053ad491a6fe049/src/config.rs#L150-L167
+    rl.set_max_history_size(100);
+    rl.set_history_ignore_dups(true);
+    rl.set_history_ignore_space(false);
+    rl.set_completion_type(DEFAULT_COMPLETION_MODE);
+    rl.set_completion_prompt_limit(100);
+    rl.set_keyseq_timeout(-1);
+    rl.set_edit_mode(rustyline::config::EditMode::Emacs);
+    rl.set_auto_add_history(false);
+    rl.set_bell_style(rustyline::config::BellStyle::default());
+    rl.set_color_mode(rustyline::ColorMode::Enabled);
+    rl.set_tab_stop(8);
+
+    if let Err(e) = crate::keybinding::load_keybindings(&mut rl) {
+        println!("Error loading keybindings: {:?}", e);
+    }
+
+    rl
+}
+
+#[cfg(feature = "rustyline-support")]
+pub fn configure_rustyline_editor(
+    rl: &mut Editor<Helper>,
+    config: &dyn nu_data::config::Conf,
+) -> Result<(), ShellError> {
+    #[cfg(windows)]
+    const DEFAULT_COMPLETION_MODE: CompletionType = CompletionType::Circular;
+    #[cfg(not(windows))]
+    const DEFAULT_COMPLETION_MODE: CompletionType = CompletionType::List;
+
+    if let Some(line_editor_vars) = config.var("line_editor") {
+        for (idx, value) in line_editor_vars.row_entries() {
+            match idx.as_ref() {
+                "max_history_size" => {
+                    if let Ok(max_history_size) = value.as_u64() {
+                        rl.set_max_history_size(max_history_size as usize);
+                    }
+                }
+                "history_duplicates" => {
+                    // history_duplicates = match value.as_string() {
+                    //     Ok(s) if s.to_lowercase() == "alwaysadd" => {
+                    //         rustyline::config::HistoryDuplicates::AlwaysAdd
+                    //     }
+                    //     Ok(s) if s.to_lowercase() == "ignoreconsecutive" => {
+                    //         rustyline::config::HistoryDuplicates::IgnoreConsecutive
+                    //     }
+                    //     _ => rustyline::config::HistoryDuplicates::AlwaysAdd,
+                    // };
+                    if let Ok(history_duplicates) = value.as_bool() {
+                        rl.set_history_ignore_dups(history_duplicates);
+                    }
+                }
+                "history_ignore_space" => {
+                    if let Ok(history_ignore_space) = value.as_bool() {
+                        rl.set_history_ignore_space(history_ignore_space);
+                    }
+                }
+                "completion_type" => {
+                    let completion_type = match value.as_string() {
+                        Ok(s) if s.to_lowercase() == "circular" => {
+                            rustyline::config::CompletionType::Circular
+                        }
+                        Ok(s) if s.to_lowercase() == "list" => {
+                            rustyline::config::CompletionType::List
+                        }
+                        #[cfg(all(unix, feature = "with-fuzzy"))]
+                        Ok(s) if s.to_lowercase() == "fuzzy" => {
+                            rustyline::config::CompletionType::Fuzzy
+                        }
+                        _ => DEFAULT_COMPLETION_MODE,
+                    };
+                    rl.set_completion_type(completion_type);
+                }
+                "completion_prompt_limit" => {
+                    if let Ok(completion_prompt_limit) = value.as_u64() {
+                        rl.set_completion_prompt_limit(completion_prompt_limit as usize);
+                    }
+                }
+                "keyseq_timeout_ms" => {
+                    if let Ok(keyseq_timeout_ms) = value.as_u64() {
+                        rl.set_keyseq_timeout(keyseq_timeout_ms as i32);
+                    }
+                }
+                "edit_mode" => {
+                    let edit_mode = match value.as_string() {
+                        Ok(s) if s.to_lowercase() == "vi" => rustyline::config::EditMode::Vi,
+                        Ok(s) if s.to_lowercase() == "emacs" => rustyline::config::EditMode::Emacs,
+                        _ => rustyline::config::EditMode::Emacs,
+                    };
+                    rl.set_edit_mode(edit_mode);
+                    // Note: When edit_mode is Emacs, the keyseq_timeout_ms is set to -1
+                    // no matter what you may have configured. This is so that key chords
+                    // can be applied without having to do them in a given timeout. So,
+                    // it essentially turns off the keyseq timeout.
+                }
+                "auto_add_history" => {
+                    if let Ok(auto_add_history) = value.as_bool() {
+                        rl.set_auto_add_history(auto_add_history);
+                    }
+                }
+                "bell_style" => {
+                    let bell_style = match value.as_string() {
+                        Ok(s) if s.to_lowercase() == "audible" => {
+                            rustyline::config::BellStyle::Audible
+                        }
+                        Ok(s) if s.to_lowercase() == "none" => rustyline::config::BellStyle::None,
+                        Ok(s) if s.to_lowercase() == "visible" => {
+                            rustyline::config::BellStyle::Visible
+                        }
+                        _ => rustyline::config::BellStyle::default(),
+                    };
+                    rl.set_bell_style(bell_style);
+                }
+                "color_mode" => {
+                    let color_mode = match value.as_string() {
+                        Ok(s) if s.to_lowercase() == "enabled" => rustyline::ColorMode::Enabled,
+                        Ok(s) if s.to_lowercase() == "forced" => rustyline::ColorMode::Forced,
+                        Ok(s) if s.to_lowercase() == "disabled" => rustyline::ColorMode::Disabled,
+                        _ => rustyline::ColorMode::Enabled,
+                    };
+                    rl.set_color_mode(color_mode);
+                }
+                "tab_stop" => {
+                    if let Ok(tab_stop) = value.as_u64() {
+                        rl.set_tab_stop(tab_stop as usize);
+                    }
+                }
+                _ => (),
+            }
+        }
+    }
+
+    Ok(())
+}
+
+#[cfg(feature = "rustyline-support")]
+pub fn nu_line_editor_helper(
+    context: &mut EvaluationContext,
+    config: &dyn nu_data::config::Conf,
+) -> crate::shell::Helper {
+    let hinter = rustyline_hinter(config);
+    crate::shell::Helper::new(context.clone(), hinter)
+}
+
+#[cfg(feature = "rustyline-support")]
+pub fn rustyline_hinter(
+    config: &dyn nu_data::config::Conf,
+) -> Option<rustyline::hint::HistoryHinter> {
+    if let Some(line_editor_vars) = config.var("line_editor") {
+        for (idx, value) in line_editor_vars.row_entries() {
+            if idx == "show_hints" && value.expect_string() == "false" {
+                return None;
+            }
+        }
+    }
+
+    Some(rustyline::hint::HistoryHinter {})
+}
+
+pub fn configure_ctrl_c(_context: &mut EvaluationContext) -> Result<(), Box<dyn Error>> {
+    #[cfg(feature = "ctrlc")]
+    {
+        let cc = _context.ctrl_c.clone();
+
+        ctrlc::set_handler(move || {
+            cc.store(true, Ordering::SeqCst);
+        })?;
+
+        if _context.ctrl_c.load(Ordering::SeqCst) {
+            _context.ctrl_c.store(false, Ordering::SeqCst);
+        }
+    }
+
+    Ok(())
+}
--- a/crates/nu-cli/src/prelude.rs
+++ b/crates/nu-cli/src/prelude.rs
@ -21,28 +21,6 @@ macro_rules! stream {
    }}
 }

-#[macro_export]
-macro_rules! trace_stream {
-    (target: $target:tt, $desc:tt = $expr:expr) => {{
-        if log::log_enabled!(target: $target, log::Level::Trace) {
-            use futures::stream::StreamExt;
-
-            let objects = $expr.inspect(move |o| {
-                trace!(
-                    target: $target,
-                    "{} = {}",
-                    $desc,
-                    nu_source::PrettyDebug::plain_string(o, 70)
-                );
-            });
-
-            $crate::stream::InputStream::from_stream(objects.boxed())
-        } else {
-            $expr
-        }
-    }};
-}
-
 #[macro_export]
 macro_rules! trace_out_stream {
    (target: $target:tt, $desc:tt = $expr:expr) => {{
@ -61,49 +39,26 @@ macro_rules! trace_out_stream {
                );
            });

-            $crate::stream::OutputStream::new(objects)
+            nu_stream::OutputStream::new(objects)
        } else {
            $expr
        }
    }};
 }

-pub(crate) use nu_protocol::{errln, out, outln, row};
-use nu_source::HasFallibleSpan;
-
-pub(crate) use crate::command_registry::CommandRegistry;
-pub(crate) use crate::commands::command::{CommandArgs, RawCommandArgs, RunnableContext};
-pub(crate) use crate::commands::Example;
-pub(crate) use crate::evaluation_context::EvaluationContext;
-pub(crate) use nu_data::config;
-pub(crate) use nu_data::value;
-// pub(crate) use crate::env::host::handle_unexpected;
-pub(crate) use crate::env::Host;
-pub(crate) use crate::shell::filesystem_shell::FilesystemShell;
-pub(crate) use crate::shell::help_shell::HelpShell;
-pub(crate) use crate::shell::shell_manager::ShellManager;
-pub(crate) use crate::shell::value_shell::ValueShell;
-pub(crate) use crate::stream::{InputStream, InterruptibleStream, OutputStream};
-pub(crate) use bigdecimal::BigDecimal;
-pub(crate) use futures::stream::BoxStream;
 pub(crate) use futures::{Stream, StreamExt};
-pub(crate) use nu_source::{
-    b, AnchorLocation, DebugDocBuilder, PrettyDebug, PrettyDebugWithSource, Span, SpannedItem, Tag,
-    TaggedItem, Text,
-};
+pub(crate) use nu_engine::Host;
+#[allow(unused_imports)]
+pub(crate) use nu_errors::ShellError;
+#[allow(unused_imports)]
+pub(crate) use nu_protocol::outln;
+pub(crate) use nu_stream::OutputStream;
+#[allow(unused_imports)]
 pub(crate) use nu_value_ext::ValueExt;
-pub(crate) use num_bigint::BigInt;
-pub(crate) use num_traits::cast::ToPrimitive;
-pub(crate) use serde::Deserialize;
-pub(crate) use std::collections::VecDeque;
-pub(crate) use std::future::Future;
-pub(crate) use std::sync::atomic::AtomicBool;
-pub(crate) use std::sync::Arc;
-
-pub(crate) use async_trait::async_trait;
-pub(crate) use indexmap::IndexMap;
-pub(crate) use itertools::Itertools;
+#[allow(unused_imports)]
+pub(crate) use std::sync::atomic::Ordering;

+#[allow(clippy::clippy::wrong_self_convention)]
 pub trait FromInputStream {
    fn from_input_stream(self) -> OutputStream;
 }
@ -119,26 +74,7 @@ where
    }
 }

-pub trait ToInputStream {
-    fn to_input_stream(self) -> InputStream;
-}
-
-impl<T, U> ToInputStream for T
-where
-    T: Stream<Item = U> + Send + 'static,
-    U: Into<Result<nu_protocol::Value, nu_errors::ShellError>>,
-{
-    fn to_input_stream(self) -> InputStream {
-        InputStream::from_stream(self.map(|item| match item.into() {
-            Ok(result) => result,
-            Err(err) => match HasFallibleSpan::maybe_span(&err) {
-                Some(span) => nu_protocol::UntaggedValue::Error(err).into_value(span),
-                None => nu_protocol::UntaggedValue::Error(err).into_untagged_value(),
-            },
-        }))
-    }
-}
-
+#[allow(clippy::clippy::wrong_self_convention)]
 pub trait ToOutputStream {
    fn to_output_stream(self) -> OutputStream;
 }
@ -154,16 +90,3 @@ where
        }
    }
 }
-
-pub trait Interruptible<V> {
-    fn interruptible(self, ctrl_c: Arc<AtomicBool>) -> InterruptibleStream<V>;
-}
-
-impl<S, V> Interruptible<V> for S
-where
-    S: Stream<Item = V> + Send + 'static,
-{
-    fn interruptible(self, ctrl_c: Arc<AtomicBool>) -> InterruptibleStream<V> {
-        InterruptibleStream::new(self, ctrl_c)
-    }
-}
--- a/crates/nu-cli/src/shell.rs
+++ b/crates/nu-cli/src/shell.rs
@ -2,15 +2,8 @@

 #[cfg(feature = "rustyline-support")]
 pub(crate) mod completer;
-pub(crate) mod filesystem_shell;
-pub(crate) mod help_shell;
 #[cfg(feature = "rustyline-support")]
 pub(crate) mod helper;
-pub(crate) mod painter;
-pub(crate) mod palette;
-pub(crate) mod shell;
-pub(crate) mod shell_manager;
-pub(crate) mod value_shell;

 #[cfg(feature = "rustyline-support")]
 pub(crate) use helper::Helper;
--- a/crates/nu-cli/src/shell/completer.rs
+++ b/crates/nu-cli/src/shell/completer.rs
@ -4,7 +4,8 @@ use crate::completion::matchers;
 use crate::completion::matchers::Matcher;
 use crate::completion::path::{PathCompleter, PathSuggestion};
 use crate::completion::{self, Completer, Suggestion};
-use crate::evaluation_context::EvaluationContext;
+use nu_engine::EvaluationContext;
+use nu_parser::ParserScope;
 use nu_source::Tag;

 use std::borrow::Cow;
@ -23,10 +24,12 @@ impl NuCompleter {
        use completion::engine::LocationType;

        let nu_context: &EvaluationContext = context.as_ref();
-        let (lite_block, _) = nu_parser::lite_parse(line, 0);

-        let classified_block = nu_parser::classify_block(&lite_block, &nu_context.registry);
-        let locations = completion::engine::completion_location(line, &classified_block.block, pos);
+        nu_context.scope.enter_scope();
+        let (block, _) = nu_parser::parse(line, 0, &nu_context.scope);
+        nu_context.scope.exit_scope();
+
+        let locations = completion::engine::completion_location(line, &block, pos);

        let matcher = nu_data::config::config(Tag::unknown())
            .ok()
--- a/crates/nu-cli/src/shell/helper.rs
+++ b/crates/nu-cli/src/shell/helper.rs
@ -1,13 +1,8 @@
-use std::borrow::Cow::{self, Owned};
-
-use nu_parser::SignatureRegistry;
-use nu_source::{Tag, Tagged};
-
 use crate::completion;
-use crate::evaluation_context::EvaluationContext;
 use crate::shell::completer::NuCompleter;
-use crate::shell::painter::Painter;
-use crate::shell::palette::DefaultPalette;
+use nu_engine::{DefaultPalette, EvaluationContext, Painter};
+use nu_source::{Tag, Tagged};
+use std::borrow::Cow::{self, Owned};

 pub struct Helper {
    completer: NuCompleter,
@ -87,11 +82,7 @@ impl rustyline::highlight::Highlighter for Helper {
    }

    fn highlight<'l>(&self, line: &'l str, _pos: usize) -> Cow<'l, str> {
-        Painter::paint_string(
-            line,
-            &self.context.registry().clone_box(),
-            &DefaultPalette {},
-        )
+        Painter::paint_string(line, &self.context.scope, &DefaultPalette {})
    }

    fn highlight_char(&self, _line: &str, _pos: usize) -> bool {
@ -121,7 +112,14 @@ impl rustyline::validate::Validator for NuValidator {
    ) -> rustyline::Result<rustyline::validate::ValidationResult> {
        let src = ctx.input();

-        let (_, err) = nu_parser::lite_parse(src, 0);
+        let (tokens, err) = nu_parser::lex(src, 0);
+        if let Some(err) = err {
+            if let nu_errors::ParseErrorReason::Eof { .. } = err.reason() {
+                return Ok(rustyline::validate::ValidationResult::Incomplete);
+            }
+        }
+
+        let (_, err) = nu_parser::parse_block(tokens);

        if let Some(err) = err {
            if let nu_errors::ParseErrorReason::Eof { .. } = err.reason() {
@ -146,3 +144,51 @@ fn vec_tag<T>(input: Vec<Tagged<T>>) -> Option<Tag> {
 }

 impl rustyline::Helper for Helper {}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use nu_engine::basic_evaluation_context;
+    use rustyline::completion::Completer;
+    use rustyline::line_buffer::LineBuffer;
+
+    #[ignore]
+    #[test]
+    fn closing_quote_should_replaced() {
+        let text = "cd \"folder with spaces\\subdirectory\\\"";
+        let replacement = "\"folder with spaces\\subdirectory\\subsubdirectory\\\"";
+
+        let mut buffer = LineBuffer::with_capacity(256);
+        buffer.insert_str(0, text);
+        buffer.set_pos(text.len() - 1);
+
+        let helper = Helper::new(basic_evaluation_context().unwrap(), None);
+
+        helper.update(&mut buffer, "cd ".len(), &replacement);
+
+        assert_eq!(
+            buffer.as_str(),
+            "cd \"folder with spaces\\subdirectory\\subsubdirectory\\\""
+        );
+    }
+
+    #[ignore]
+    #[test]
+    fn replacement_with_cursor_in_text() {
+        let text = "cd \"folder with spaces\\subdirectory\\\"";
+        let replacement = "\"folder with spaces\\subdirectory\\subsubdirectory\\\"";
+
+        let mut buffer = LineBuffer::with_capacity(256);
+        buffer.insert_str(0, text);
+        buffer.set_pos(text.len() - 30);
+
+        let helper = Helper::new(basic_evaluation_context().unwrap(), None);
+
+        helper.update(&mut buffer, "cd ".len(), &replacement);
+
+        assert_eq!(
+            buffer.as_str(),
+            "cd \"folder with spaces\\subdirectory\\subsubdirectory\\\""
+        );
+    }
+}
--- a/crates/nu-cli/src/types/deduction.rs
+++ b/crates/nu-cli/src/types/deduction.rs
@ -1,12 +1,14 @@
-use crate::CommandRegistry;
-
+#![allow(dead_code)]
+use itertools::{merge_join_by, EitherOrBoth, Itertools};
 use lazy_static::lazy_static;
+use log::trace;
+use nu_engine::Scope;
 use nu_errors::ShellError;
-use nu_parser::SignatureRegistry;
+use nu_parser::ParserScope;
 use nu_protocol::{
    hir::{
-        Binary, Block, ClassifiedCommand, Commands, Expression, Literal, NamedArguments,
-        NamedValue, Operator, SpannedExpression,
+        Binary, Block, ClassifiedCommand, Expression, Literal, NamedArguments, NamedValue,
+        Operator, Pipeline, SpannedExpression,
    },
    NamedType, PositionalType, Signature, SyntaxShape,
 };
@ -14,9 +16,6 @@ use nu_source::Span;
 use serde::{Deserialize, Serialize};
 use std::{collections::HashMap, hash::Hash};

-use itertools::{merge_join_by, EitherOrBoth, Itertools};
-use log::trace;
-
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct VarDeclaration {
    pub name: String,
@ -212,7 +211,7 @@ fn get_result_shape_of(
    l_shape: SyntaxShape,
    op_expr: &SpannedExpression,
    r_shape: SyntaxShape,
-) -> Result<SyntaxShape, ShellError> {
+) -> SyntaxShape {
    let op = match op_expr.expr {
        Expression::Literal(Literal::Operator(op)) => op,
        _ => unreachable!("Passing anything but the op expr is invalid"),
@ -221,7 +220,7 @@ fn get_result_shape_of(
    //There is some code for that in the evaluator already.
    //One might reuse it.
    //For now we ignore this issue
-    Ok(match op {
+    match op {
        Operator::Equal
        | Operator::NotEqual
        | Operator::LessThan
@ -258,7 +257,8 @@ fn get_result_shape_of(
            }
        }
        Operator::Modulo => SyntaxShape::Number,
-    })
+        Operator::Pow => SyntaxShape::Number,
+    }
 }

 fn get_shape_of_expr(expr: &SpannedExpression) -> Option<SyntaxShape> {
@ -290,13 +290,13 @@ fn get_shape_of_expr(expr: &SpannedExpression) -> Option<SyntaxShape> {
        Expression::ExternalWord => Some(SyntaxShape::String),
        Expression::Synthetic(_) => Some(SyntaxShape::String),

-        Expression::Binary(_) => Some(SyntaxShape::Math),
+        Expression::Binary(_) => Some(SyntaxShape::RowCondition),
        Expression::Range(_) => Some(SyntaxShape::Range),
        Expression::List(_) => Some(SyntaxShape::Table),
        Expression::Boolean(_) => Some(SyntaxShape::String),

        Expression::Path(_) => Some(SyntaxShape::ColumnPath),
-        Expression::FilePath(_) => Some(SyntaxShape::Path),
+        Expression::FilePath(_) => Some(SyntaxShape::FilePath),
        Expression::Block(_) => Some(SyntaxShape::Block),
        Expression::ExternalCommand(_) => Some(SyntaxShape::String),
        Expression::Table(_, _) => Some(SyntaxShape::Table),
@ -318,14 +318,14 @@ fn spanned_to_binary(bin_spanned: &SpannedExpression) -> &Binary {
 ///Returns result shape of this math expr otherwise
 fn get_result_shape_of_math_expr(
    bin: &Binary,
-    (pipeline_idx, pipeline): (usize, &Commands),
-    registry: &CommandRegistry,
+    (pipeline_idx, pipeline): (usize, &Pipeline),
+    scope: &Scope,
 ) -> Result<Option<SyntaxShape>, ShellError> {
    let mut shapes: Vec<Option<SyntaxShape>> = vec![];
    for expr in &[&bin.left, &bin.right] {
        let shape = match &expr.expr {
            Expression::Binary(deep_binary) => {
-                get_result_shape_of_math_expr(&deep_binary, (pipeline_idx, pipeline), registry)?
+                get_result_shape_of_math_expr(&deep_binary, (pipeline_idx, pipeline), scope)?
            }
            _ => get_shape_of_expr(expr),
        };
@ -334,7 +334,7 @@ fn get_result_shape_of_math_expr(
    //match lhs, rhs
    match (shapes[0], shapes[1]) {
        (None, None) | (None, _) | (_, None) => Ok(None),
-        (Some(left), Some(right)) => get_result_shape_of(left, &bin.op, right).map(Some),
+        (Some(left), Some(right)) => Ok(Some(get_result_shape_of(left, &bin.op, right))),
    }
 }

@ -356,7 +356,7 @@ impl VarSyntaxShapeDeductor {
    pub fn infer_vars(
        vars_to_find: &[VarDeclaration],
        block: &Block,
-        registry: &CommandRegistry,
+        scope: &Scope,
    ) -> Result<Vec<(VarDeclaration, Option<Deduction>)>, ShellError> {
        trace!("Deducing shapes for vars: {:?}", vars_to_find);

@ -367,7 +367,7 @@ impl VarSyntaxShapeDeductor {
            dependencies: Vec::new(),
            dependencies_on_result_type: Vec::new(),
        };
-        deducer.infer_shape(block, registry)?;
+        deducer.infer_shape(block, scope)?;

        deducer.solve_dependencies();
        trace!("Found shapes for vars: {:?}", deducer.inferences);
@ -386,24 +386,22 @@ impl VarSyntaxShapeDeductor {
            .collect())
    }

-    fn infer_shape(&mut self, block: &Block, registry: &CommandRegistry) -> Result<(), ShellError> {
+    fn infer_shape(&mut self, block: &Block, scope: &Scope) -> Result<(), ShellError> {
        trace!("Infering vars in shape");
-        for pipeline in &block.block {
-            self.infer_pipeline(pipeline, registry)?;
+        for group in &block.block {
+            for pipeline in &group.pipelines {
+                self.infer_pipeline(pipeline, scope)?;
+            }
        }
        Ok(())
    }

-    pub fn infer_pipeline(
-        &mut self,
-        pipeline: &Commands,
-        registry: &CommandRegistry,
-    ) -> Result<(), ShellError> {
+    pub fn infer_pipeline(&mut self, pipeline: &Pipeline, scope: &Scope) -> Result<(), ShellError> {
        trace!("Infering vars in pipeline");
        for (cmd_pipeline_idx, classified) in pipeline.list.iter().enumerate() {
            match &classified {
                ClassifiedCommand::Internal(internal) => {
-                    if let Some(signature) = registry.get(&internal.name) {
+                    if let Some(signature) = scope.get_signature(&internal.name) {
                        //When the signature is given vars directly used as named or positional
                        //arguments can be deduced
                        //e.G. cp $var1 $var2
@ -426,7 +424,7 @@ impl VarSyntaxShapeDeductor {
                            self.infer_shapes_in_expr(
                                (cmd_pipeline_idx, pipeline),
                                pos_expr,
-                                registry,
+                                scope,
                            )?;
                        }
                    }
@ -437,7 +435,7 @@ impl VarSyntaxShapeDeductor {
                                self.infer_shapes_in_expr(
                                    (cmd_pipeline_idx, pipeline),
                                    named_expr,
-                                    registry,
+                                    scope,
                                )?;
                            }
                        }
@ -448,11 +446,7 @@ impl VarSyntaxShapeDeductor {
                        "Infering shapes in ClassifiedCommand::Expr: {:?}",
                        spanned_expr
                    );
-                    self.infer_shapes_in_expr(
-                        (cmd_pipeline_idx, pipeline),
-                        spanned_expr,
-                        registry,
-                    )?;
+                    self.infer_shapes_in_expr((cmd_pipeline_idx, pipeline), spanned_expr, scope)?;
                }
                ClassifiedCommand::Dynamic(_) | ClassifiedCommand::Error(_) => unimplemented!(),
            }
@ -534,25 +528,25 @@ impl VarSyntaxShapeDeductor {

    fn infer_shapes_in_expr(
        &mut self,
-        (pipeline_idx, pipeline): (usize, &Commands),
+        (pipeline_idx, pipeline): (usize, &Pipeline),
        spanned_expr: &SpannedExpression,
-        registry: &CommandRegistry,
+        scope: &Scope,
    ) -> Result<(), ShellError> {
        match &spanned_expr.expr {
            Expression::Binary(_) => {
                trace!("Infering vars in bin expr");
-                self.infer_shapes_in_binary_expr((pipeline_idx, pipeline), spanned_expr, registry)?;
+                self.infer_shapes_in_binary_expr((pipeline_idx, pipeline), spanned_expr, scope)?;
            }
            Expression::Block(b) => {
                trace!("Infering vars in block");
-                self.infer_shape(&b, registry)?;
+                self.infer_shape(&b, scope)?;
            }
            Expression::Path(path) => {
                trace!("Infering vars in path");
                match &path.head.expr {
                    //PathMember can't be var yet (?)
                    //TODO Iterate over path parts and find var when implemented
-                    Expression::Invocation(b) => self.infer_shape(&b, registry)?,
+                    Expression::Invocation(b) => self.infer_shape(&b, scope)?,
                    Expression::Variable(var_name, span) => {
                        self.checked_insert(
                            &VarUsage::new(var_name, span),
@ -593,12 +587,12 @@ impl VarSyntaxShapeDeductor {
            Expression::List(inner_exprs) => {
                trace!("Infering vars in list");
                for expr in inner_exprs {
-                    self.infer_shapes_in_expr((pipeline_idx, pipeline), expr, registry)?;
+                    self.infer_shapes_in_expr((pipeline_idx, pipeline), expr, scope)?;
                }
            }
            Expression::Invocation(invoc) => {
                trace!("Infering vars in invocation: {:?}", invoc);
-                self.infer_shape(invoc, registry)?;
+                self.infer_shape(invoc, scope)?;
            }
            Expression::Table(header, _rows) => {
                self.infer_shapes_in_table_header(header)?;
@ -660,11 +654,11 @@ impl VarSyntaxShapeDeductor {
        (var, expr): (&VarUsage, &SpannedExpression),
        //source_bin is binary having var on one and expr on other side
        source_bin: &SpannedExpression,
-        (pipeline_idx, pipeline): (usize, &Commands),
-        registry: &CommandRegistry,
+        (pipeline_idx, pipeline): (usize, &Pipeline),
+        scope: &Scope,
    ) -> Result<Option<SyntaxShape>, ShellError> {
-        get_result_shape_of_math_expr(spanned_to_binary(expr), (pipeline_idx, pipeline), registry)
-            .map(|shape| {
+        get_result_shape_of_math_expr(spanned_to_binary(expr), (pipeline_idx, pipeline), scope).map(
+            |shape| {
                if shape == None {
                    self.dependencies_on_result_type.push((
                        var.clone(),
@ -673,7 +667,8 @@ impl VarSyntaxShapeDeductor {
                    ));
                }
                shape
-            })
+            },
+        )
    }

    fn get_shape_of_binary_arg_or_insert_dependency(
@ -682,8 +677,8 @@ impl VarSyntaxShapeDeductor {
        (var, expr): (&VarUsage, &SpannedExpression),
        //source_bin is binary having var on one and expr on other side
        source_bin: &SpannedExpression,
-        (pipeline_idx, pipeline): (usize, &Commands),
-        registry: &CommandRegistry,
+        (pipeline_idx, pipeline): (usize, &Pipeline),
+        scope: &Scope,
    ) -> Result<Option<SyntaxShape>, ShellError> {
        trace!("Getting shape of binary arg {:?} for var {:?}", expr, var);
        if let Some(shape) = self.get_shape_of_expr_or_insert_dependency(
@ -695,12 +690,13 @@ impl VarSyntaxShapeDeductor {
            match shape {
                //If the shape of expr is math, we return the result shape of this math expr if
                //possible
-                SyntaxShape::Math => self.get_result_shape_of_math_expr_or_insert_dependency(
-                    (var, expr),
-                    source_bin,
-                    (pipeline_idx, pipeline),
-                    registry,
-                ),
+                SyntaxShape::RowCondition => self
+                    .get_result_shape_of_math_expr_or_insert_dependency(
+                        (var, expr),
+                        source_bin,
+                        (pipeline_idx, pipeline),
+                        scope,
+                    ),
                _ => Ok(Some(shape)),
            }
        } else {
@ -714,8 +710,7 @@ impl VarSyntaxShapeDeductor {
        var: &VarUsage,
        bin_spanned: &SpannedExpression,
        list: &[SpannedExpression],
-        (_pipeline_idx, _pipeline): (usize, &Commands),
-        _registry: &CommandRegistry,
+        (_pipeline_idx, _pipeline): (usize, &Pipeline),
    ) -> Option<Vec<SyntaxShape>> {
        let shapes_in_list = list
            .iter()
@ -740,8 +735,8 @@ impl VarSyntaxShapeDeductor {
        var_side: BinarySide,
        //Binary having expr on one side and var on other
        bin_spanned: &SpannedExpression,
-        (pipeline_idx, pipeline): (usize, &Commands),
-        registry: &CommandRegistry,
+        (pipeline_idx, pipeline): (usize, &Pipeline),
+        scope: &Scope,
    ) -> Result<(), ShellError> {
        trace!("Infering shapes between var {:?} and expr {:?}", var, expr);
        let bin = spanned_to_binary(bin_spanned);
@ -765,60 +760,58 @@ impl VarSyntaxShapeDeductor {
                        )],
                    )?;
                }
-                Operator::In | Operator::NotIn => {
-                    match var_side {
-                        BinarySide::Left => match &expr.expr {
-                            Expression::List(list) => {
-                                if !list.is_empty() {
-                                    let shapes_in_list = self
-                                        .get_shapes_in_list_or_insert_dependency(
+                Operator::In | Operator::NotIn => match var_side {
+                    BinarySide::Left => match &expr.expr {
+                        Expression::List(list) => {
+                            if !list.is_empty() {
+                                let shapes_in_list = self.get_shapes_in_list_or_insert_dependency(
+                                    var,
+                                    bin_spanned,
+                                    &list,
+                                    (pipeline_idx, pipeline),
+                                );
+                                match shapes_in_list {
+                                    None => {}
+                                    Some(shapes_in_list) => {
+                                        self.checked_insert(
                                            var,
-                                            bin_spanned,
-                                            &list,
-                                            (pipeline_idx, pipeline),
-                                            registry,
-                                        );
-                                    match shapes_in_list {
-                                        None => {}
-                                        Some(shapes_in_list) => {
-                                            self.checked_insert(
-                                                var,
-                                                VarShapeDeduction::from_usage_with_alternatives(
-                                                    &var.span,
-                                                    &shapes_in_list,
-                                                ),
-                                            )?;
-                                        }
+                                            VarShapeDeduction::from_usage_with_alternatives(
+                                                &var.span,
+                                                &shapes_in_list,
+                                            ),
+                                        )?;
                                    }
                                }
                            }
-                            Expression::Table(_, _)
-                            | Expression::Literal(_)
-                            | Expression::ExternalWord
-                            | Expression::Synthetic(_)
-                            | Expression::Variable(_, _)
-                            | Expression::Binary(_)
-                            | Expression::Range(_)
-                            | Expression::Block(_)
-                            | Expression::Path(_)
-                            | Expression::FilePath(_)
-                            | Expression::ExternalCommand(_)
-                            | Expression::Command
-                            | Expression::Invocation(_)
-                            | Expression::Boolean(_)
-                            | Expression::Garbage => {unreachable!("Parser should have rejected code. In only applicable with rhs of type List")}
-                        },
-                        BinarySide::Right => {
-                            self.checked_insert(
-                                var,
-                                VarShapeDeduction::from_usage_with_alternatives(
-                                    &var.span,
-                                    &[SyntaxShape::Table],
-                                ),
-                            )?;
                        }
+                        Expression::Table(_, _)
+                        | Expression::Literal(_)
+                        | Expression::ExternalWord
+                        | Expression::Synthetic(_)
+                        | Expression::Variable(_, _)
+                        | Expression::Binary(_)
+                        | Expression::Range(_)
+                        | Expression::Block(_)
+                        | Expression::Path(_)
+                        | Expression::FilePath(_)
+                        | Expression::ExternalCommand(_)
+                        | Expression::Command
+                        | Expression::Invocation(_)
+                        | Expression::Boolean(_)
+                        | Expression::Garbage => {
+                            unreachable!("Parser should have rejected code. In only applicable with rhs of type List")
+                        }
+                    },
+                    BinarySide::Right => {
+                        self.checked_insert(
+                            var,
+                            VarShapeDeduction::from_usage_with_alternatives(
+                                &var.span,
+                                &[SyntaxShape::Table],
+                            ),
+                        )?;
                    }
-                }
+                },
                Operator::Modulo => {
                    self.checked_insert(
                        var,
@ -840,7 +833,7 @@ impl VarSyntaxShapeDeductor {
                        (var, expr),
                        bin_spanned,
                        (pipeline_idx, pipeline),
-                        registry,
+                        scope,
                    )? {
                        match shape {
                            SyntaxShape::Int | SyntaxShape::Number => {
@ -868,12 +861,12 @@ impl VarSyntaxShapeDeductor {
                        }
                    }
                }
-                Operator::Multiply | Operator::Divide => {
+                Operator::Multiply | Operator::Divide | Operator::Pow => {
                    if let Some(shape) = self.get_shape_of_binary_arg_or_insert_dependency(
                        (var, expr),
                        bin_spanned,
                        (pipeline_idx, pipeline),
-                        registry,
+                        scope,
                    )? {
                        self.checked_insert(
                            var,
@ -893,9 +886,9 @@ impl VarSyntaxShapeDeductor {

    fn infer_shapes_in_binary_expr(
        &mut self,
-        (pipeline_idx, pipeline): (usize, &Commands),
+        (pipeline_idx, pipeline): (usize, &Pipeline),
        bin_spanned: &SpannedExpression,
-        registry: &CommandRegistry,
+        scope: &Scope,
    ) -> Result<(), ShellError> {
        let bin = spanned_to_binary(bin_spanned);
        if let Expression::Variable(left_var_name, l_span) = &bin.left.expr {
@ -904,7 +897,7 @@ impl VarSyntaxShapeDeductor {
                BinarySide::Left,
                bin_spanned,
                (pipeline_idx, pipeline),
-                registry,
+                scope,
            )?;
        }

@ -914,13 +907,13 @@ impl VarSyntaxShapeDeductor {
                BinarySide::Right,
                bin_spanned,
                (pipeline_idx, pipeline),
-                registry,
+                scope,
            )?;
        }
        //Descend deeper into bin tree
-        self.infer_shapes_in_expr((pipeline_idx, pipeline), &bin.right, registry)?;
+        self.infer_shapes_in_expr((pipeline_idx, pipeline), &bin.right, scope)?;
        //Descend deeper into bin tree
-        self.infer_shapes_in_expr((pipeline_idx, pipeline), &bin.left, registry)?;
+        self.infer_shapes_in_expr((pipeline_idx, pipeline), &bin.left, scope)?;

        Ok(())
    }
--- a/crates/nu-cli/tests/commands/alias.rs
+++ b/crates/nu-cli/tests/commands/alias.rs
@ -1,299 +0,0 @@
-#[cfg(test)]
-mod tests {
-    use nu_test_support::nu;
-    use nu_test_support::playground::Playground;
-
-    #[test]
-    fn alias_without_args() {
-        let actual = nu!(
-            cwd: ".",
-            r#"
-            alias -i e [] {^echo hi nushell | to json}
-            e
-        "#
-        );
-        #[cfg(not(windows))]
-        assert_eq!(actual.out, "\"hi nushell\\n\"");
-        #[cfg(windows)]
-        assert_eq!(actual.out, "\"hi nushell\\r\\n\"");
-    }
-
-    #[test]
-    fn alias_args_work() {
-        Playground::setup("append_test_2", |dirs, _| {
-            let actual = nu!(
-                cwd: dirs.root(),
-                r#"
-                 alias -i double_echo [b] {echo $b | to json}
-                 double_echo 1kb
-             "#
-            );
-
-            assert_eq!(actual.out, "1024");
-        })
-    }
-
-    #[test]
-    fn alias_args_double_echo() {
-        Playground::setup("append_test_1", |dirs, _| {
-            let actual = nu!(
-                cwd: dirs.root(),
-                r#"
-                alias -i double_echo [a b] {echo $a $b}
-                double_echo 1 2 | to json
-            "#
-            );
-
-            assert_eq!(actual.out, "[1,2]");
-        })
-    }
-
-    #[test]
-    #[cfg(not(windows))]
-    fn alias_parses_path_tilde() {
-        let actual = nu!(
-        cwd: "tests/fixtures/formats",
-        r#"
-        alias -i new-cd [dir] { cd $dir }
-        new-cd ~
-        pwd
-        "#
-        );
-
-        //If this fails for you, check for any special unicode characters in your ~ path
-        assert!(actual.out.chars().filter(|c| *c == '/').count() == 2);
-        #[cfg(target_os = "linux")]
-        assert!(actual.out.contains("home"));
-        #[cfg(target_os = "macos")]
-        assert!(actual.out.contains("Users"));
-    }
-
-    #[test]
-    fn alias_missing_args_work() {
-        Playground::setup("append_test_1", |dirs, _| {
-            let actual = nu!(
-                cwd: dirs.root(),
-                r#"
-                alias double_echo [a b] {^echo $a $b}
-                double_echo bob
-            "#
-            );
-
-            assert_eq!(actual.out, "bob");
-        })
-    }
-
-    #[test]
-    #[ignore]
-    fn alias_with_in_str_var_right() {
-        //Failing
-        let actual = nu!(
-            cwd: ".",
-            r#"
-        alias -i lw [newbie] {echo 1 2 3 | where "hello_world" in $newbie | to json}
-        lw [hello_world_test_repo]
-        "#
-        );
-        assert_eq!(actual.out, "[1,2,3]");
-    }
-
-    #[test]
-    fn alias_with_in_str_var_right_mismatch() {
-        let actual = nu!(
-            cwd: ".",
-            r#"
-        alias -i lw [rust_newbie] { echo 1 2 3 | where "hello_world" in $rust_newbie | to json }
-        lw [ big_brain_programmer ]
-        "#
-        );
-        assert_eq!(actual.out, "");
-    }
-
-    #[test]
-    fn alias_with_in_err() {
-        //in operator only applicable for strings atm
-        let actual = nu!(
-            cwd: ".",
-            r#"
-        alias -i lw [p] {echo 1 2 3 | where $p in [1 3 2] | to json}
-        lw /root/sys
-        "#
-        );
-        assert!(actual.err.contains("Type"));
-    }
-
-    #[test]
-    #[ignore]
-    fn alias_with_contains() {
-        //Failing
-        let actual = nu!(
-            cwd: ".",
-            r#"
-        alias -i lw [p] {echo 1 2 3 | where $p in [1 hi 3] | to json}
-        lw 1
-        "#
-        );
-        assert_eq!(actual.out, "[1,2,3]");
-    }
-
-    #[test]
-    #[ignore]
-    fn alias_with_contains_and_var_is_right_side() {
-        //Failing
-        let actual = nu!(
-            cwd: ".",
-            r#"
-        alias -i lw [p] {echo 1 2 3 | where 1 in $p | to json}
-        lw [1 2 hi]
-        "#
-        );
-        assert_eq!(actual.out, "[1,2,3]");
-    }
-
-    #[test]
-    fn error_alias_wrong_shape_shallow() {
-        let actual = nu!(
-            cwd: ".",
-            r#"
-        alias -i round-to [num digits] { echo $num | str from -d $digits }
-        round-to 3.45 a
-        "#
-        );
-
-        assert!(actual.err.contains("Type"));
-    }
-
-    #[test]
-    fn error_alias_wrong_shape_deep_invocation() {
-        let actual = nu!(
-        cwd: ".",
-        r#"
-        alias -i round-to [nums digits] { echo $nums | each {= $(str from -d $digits)}}
-        round-to 3.45 a
-        "#
-        );
-
-        assert!(actual.err.contains("Type"));
-    }
-
-    #[test]
-    fn error_alias_wrong_shape_deep_binary() {
-        let actual = nu!(
-        cwd: ".",
-        r#"
-        alias -i round-plus-one [nums digits] { echo $nums | each {= $(str from -d $digits | str to-decimal) + 1}}
-        round-plus-one 3.45 a
-        "#
-        );
-
-        assert!(actual.err.contains("Type"));
-    }
-
-    #[test]
-    fn error_alias_wrong_shape_deeper_binary() {
-        let actual = nu!(
-        cwd: ".",
-        r#"
-        alias -i round-one-more [num digits] { echo $num | str from -d $(= $digits + 1) }
-        round-one-more 3.45 a
-        "#
-        );
-
-        assert!(actual.err.contains("Type"));
-    }
-
-    #[test]
-    fn error_alias_syntax_shape_clash() {
-        let actual = nu!(
-            cwd: ".",
-            r#"
-        alias -i clash [a] { echo 1.1 2 3 | each { str from -d $a } | range $a }
-        "#
-        );
-
-        assert!(actual.err.contains("Contrary types for variable $a"));
-    }
-
-    #[test]
-    #[ignore]
-    fn alias_with_math_var() {
-        //Failing
-        let actual = nu!(
-            cwd: ".",
-            r#"
-         alias -i echo_math [math] { echo {= 1 + $math}}
-         echo_math 1 + 1 | to json
-         "#
-        );
-
-        assert_eq!(actual.out, "3");
-    }
-    #[test]
-    #[ignore]
-    fn alias_with_math_var2() {
-        //Failing
-        let actual = nu!(
-            cwd: ".",
-            r#"
-         alias -i round-plus-one [nums digits math] { echo $nums | each {= $(str from -d $digits | str to-decimal) + $math}}
-         round-plus-one 3.45 2 1 + 1 | to json
-         "#
-        );
-        assert_eq!(actual.out, "5.45");
-    }
-
-    #[test]
-    fn alias_with_true_and_false() {
-        //https://github.com/nushell/nushell/issues/2416
-        let actual = nu!(
-            cwd: ".",
-            r#"
-        alias -i is_empty [a] {if $(echo $a | empty?) == $true { echo $true } { echo $false }}
-        is_empty ""
-        "#
-        );
-        assert!(actual.out.contains("true"));
-    }
-
-    #[test]
-    fn alias_sent_env() {
-        //https://github.com/nushell/nushell/issues/1835
-        let actual = nu!(
-            cwd: ".",
-            r#"
-            alias -i set-env [name value] { echo $nu.env | insert $name $value | get SHELL | to json }
-            set-env SHELL /bin/nu
-        "#
-        );
-        assert_eq!(actual.out, "\"/bin/nu\"");
-    }
-
-    #[test]
-    #[ignore]
-    fn alias_with_math_arg() {
-        //Failing
-        let actual = nu!(
-            cwd: ".",
-            r#"
-             alias -i lswh [math] { echo 1 2 3 | where $math | to json }
-             lswh $it > 2
-         "#
-        );
-        assert_eq!(actual.out, "3");
-    }
-
-    #[test]
-    #[cfg(not(windows))]
-    fn alias_ls() {
-        //https://github.com/nushell/nushell/issues/1632
-        let actual = nu!(
-            cwd: ".",
-            r#"
-            touch /tmp/nushell_alias_test
-            alias -i l [x] { ls $x }
-            l /tmp | to json
-        "#
-        );
-        assert!(actual.out.contains("nushell_alias_test"));
-    }
-}
--- a/crates/nu-cli/tests/commands/echo.rs
+++ b/crates/nu-cli/tests/commands/echo.rs
@ -1,13 +0,0 @@
-use nu_test_support::{nu, pipeline};
-
-#[test]
-fn echo_range_is_lazy() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats", pipeline(
-        r#"
-        echo 1..10000000000 | first 3 | to json
-        "#
-    ));
-
-    assert_eq!(actual.out, "[1,2,3]");
-}
--- a/crates/nu-cli/tests/commands/select.rs
+++ b/crates/nu-cli/tests/commands/select.rs
@ -1,124 +0,0 @@
-use nu_test_support::fs::Stub::FileWithContentToBeTrimmed;
-use nu_test_support::playground::Playground;
-use nu_test_support::{nu, pipeline};
-
-#[test]
-fn regular_columns() {
-    Playground::setup("select_test_1", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.csv",
-            r#"
-                first_name,last_name,rusty_at,type
-                Andrés,Robalino,10/11/2013,A
-                Jonathan,Turner,10/12/2013,B
-                Yehuda,Katz,10/11/2013,A
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), pipeline(
-            r#"
-                open los_tres_caballeros.csv
-                | select rusty_at last_name
-                | nth 0
-                | get last_name
-            "#
-        ));
-
-        assert_eq!(actual.out, "Robalino");
-    })
-}
-
-#[test]
-fn complex_nested_columns() {
-    Playground::setup("select_test_2", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.json",
-            r#"
-                {
-                    "nu": {
-                        "committers": [
-                            {"name": "Andrés N. Robalino"},
-                            {"name": "Jonathan Turner"},
-                            {"name": "Yehuda Katz"}
-                        ],
-                        "releases": [
-                            {"version": "0.2"}
-                            {"version": "0.8"},
-                            {"version": "0.9999999"}
-                        ],
-                        "0xATYKARNU": [
-                            ["Th", "e", " "],
-                            ["BIG", " ", "UnO"],
-                            ["punto", "cero"]
-                        ]
-                    }
-                }
-            "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), pipeline(
-            r#"
-                open los_tres_caballeros.json
-                | select nu."0xATYKARNU" nu.committers.name nu.releases.version
-                | where "nu.releases.version" > "0.8"
-                | get "nu.releases.version"
-            "#
-        ));
-
-        assert_eq!(actual.out, "0.9999999");
-    })
-}
-
-#[test]
-fn allows_if_given_unknown_column_name_is_missing() {
-    Playground::setup("select_test_3", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "los_tres_caballeros.csv",
-            r#"
-                    first_name,last_name,rusty_at,type
-                    Andrés,Robalino,10/11/2013,A
-                    Jonathan,Turner,10/12/2013,B
-                    Yehuda,Katz,10/11/2013,A
-                "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), pipeline(
-            r#"
-                open los_tres_caballeros.csv
-                | select rrusty_at first_name
-                | count
-            "#
-        ));
-
-        assert_eq!(actual.out, "3");
-    })
-}
-
-#[test]
-fn column_names_with_spaces() {
-    Playground::setup("select_test_4", |dirs, sandbox| {
-        sandbox.with_files(vec![FileWithContentToBeTrimmed(
-            "test_data.csv",
-            r#"
-                    first name,last name
-                    Jonathan,Turner
-                    Jonathan,Arns
-                "#,
-        )]);
-
-        let actual = nu!(
-            cwd: dirs.test(), pipeline(
-            r#"
-                open test_data.csv
-                | select "last name"
-                | to json
-            "#
-        ));
-
-        let expected_output = r#"[{"last name":"Turner"},{"last name":"Arns"}]"#;
-        assert_eq!(actual.out, expected_output);
-    })
-}
--- a/crates/nu-command/Cargo.toml
+++ b/crates/nu-command/Cargo.toml
@ -0,0 +1,132 @@
+[package]
+authors = ["The Nu Project Contributors"]
+build = "build.rs"
+description = "CLI for nushell"
+edition = "2018"
+license = "MIT"
+name = "nu-command"
+version = "0.27.1"
+
+[lib]
+doctest = false
+
+[dependencies]
+nu-data = { version = "0.27.1", path = "../nu-data" }
+nu-engine = { version = "0.27.1", path = "../nu-engine" }
+nu-errors = { version = "0.27.1", path = "../nu-errors" }
+nu-json = { version = "0.27.1", path = "../nu-json" }
+nu-parser = { version = "0.27.1", path = "../nu-parser" }
+nu-plugin = { version = "0.27.1", path = "../nu-plugin" }
+nu-protocol = { version = "0.27.1", path = "../nu-protocol" }
+nu-source = { version = "0.27.1", path = "../nu-source" }
+nu-stream = { version = "0.27.1", path = "../nu-stream" }
+nu-table = { version = "0.27.1", path = "../nu-table" }
+nu-test-support = { version = "0.27.1", path = "../nu-test-support" }
+nu-value-ext = { version = "0.27.1", path = "../nu-value-ext" }
+
+Inflector = "0.11"
+ansi_term = "0.12.1"
+arboard = { version = "1.1.0", optional = true }
+async-recursion = "0.3.2"
+async-trait = "0.1.42"
+base64 = "0.13.0"
+bigdecimal = { version = "0.2.0", features = ["serde"] }
+byte-unit = "4.0.9"
+bytes = "1.0.1"
+calamine = "0.17.0"
+chrono = { version = "0.4.19", features = ["serde"] }
+chrono-tz = "0.5.3"
+clap = "2.33.3"
+codespan-reporting = "0.11.0"
+csv = "1.1.3"
+ctrlc = { version = "3.1.7", optional = true }
+derive-new = "0.5.8"
+directories-next = { version = "2.0.0", optional = true }
+dirs-next = { version = "2.0.0", optional = true }
+dtparse = "1.2.0"
+dunce = "1.0.1"
+eml-parser = "0.1.0"
+encoding_rs = "0.8.28"
+filesize = "0.2.0"
+fs_extra = "1.2.0"
+futures = { version = "0.3.12", features = ["compat", "io-compat"] }
+futures-util = "0.3.12"
+futures_codec = "0.4.1"
+getset = "0.1.1"
+glob = "0.3.0"
+htmlescape = "0.3.1"
+ical = "0.7.0"
+ichwh = { version = "0.3.4", optional = true }
+indexmap = { version = "1.6.1", features = ["serde-1"] }
+itertools = "0.10.0"
+lazy_static = "1.*"
+log = "0.4.14"
+meval = "0.2.0"
+num-bigint = { version = "0.3.1", features = ["serde"] }
+num-format = { version = "0.4.0", features = ["with-num-bigint"] }
+num-traits = "0.2.14"
+parking_lot = "0.11.1"
+pin-utils = "0.1.0"
+pretty-hex = "0.2.1"
+ptree = { version = "0.3.1", optional = true }
+query_interface = "0.3.5"
+quick-xml = "0.21.0"
+rand = "0.7.3"
+rayon = "1.5.0"
+regex = "1.4.3"
+roxmltree = "0.14.0"
+rust-embed = "5.9.0"
+rustyline = { version = "7.1.0", optional = true }
+serde = { version = "1.0.123", features = ["derive"] }
+serde_bytes = "0.11.5"
+serde_ini = "0.2.0"
+serde_json = "1.0.61"
+serde_urlencoded = "0.7.0"
+serde_yaml = "0.8.16"
+sha2 = "0.9.3"
+shellexpand = "2.1.0"
+strip-ansi-escapes = "0.1.0"
+sxd-document = "0.3.2"
+sxd-xpath = "0.4.2"
+tempfile = "3.2.0"
+term = { version = "0.7.0", optional = true }
+term_size = "0.3.2"
+termcolor = "1.1.2"
+titlecase = "1.1.0"
+toml = "0.5.8"
+trash = { version = "1.3.0", optional = true }
+unicode-segmentation = "1.7.1"
+url = "2.2.0"
+uuid_crate = { package = "uuid", version = "0.8.2", features = ["v4"], optional = true }
+which = { version = "4.0.2", optional = true }
+zip = { version = "0.5.9", optional = true }
+
+[target.'cfg(unix)'.dependencies]
+umask = "1.0.0"
+users = "0.11.0"
+
+# TODO this will be possible with new dependency resolver
+#   (currently on nightly behind -Zfeatures=itarget):
+#   https://github.com/rust-lang/cargo/issues/7914
+#[target.'cfg(not(windows))'.dependencies]
+#num-format = {version = "0.4", features = ["with-system-locale"]}
+
+[dependencies.rusqlite]
+features = ["bundled", "blob"]
+optional = true
+version = "0.24.2"
+
+[build-dependencies]
+shadow-rs = "0.5"
+
+[dev-dependencies]
+quickcheck = "1.0.3"
+quickcheck_macros = "1.0.0"
+
+[features]
+clipboard-cli = ["arboard"]
+rustyline-support = ["rustyline"]
+stable = []
+trash-support = ["trash"]
+directories = ["directories-next"]
+dirs = ["dirs-next"]
--- a/crates/nu-command/assets/228_themes.zip
+++ b/crates/nu-command/assets/228_themes.zip
--- a/crates/nu-command/build.rs
+++ b/crates/nu-command/build.rs
@ -0,0 +1,3 @@
+fn main() -> shadow_rs::SdResult<()> {
+    shadow_rs::new()
+}
--- a/crates/nu-command/src/commands.rs
+++ b/crates/nu-command/src/commands.rs
@ -4,11 +4,10 @@ pub(crate) mod macros;
 mod from_delimited_data;
 mod to_delimited_data;

-pub(crate) mod alias;
 pub(crate) mod ansi;
 pub(crate) mod append;
 pub(crate) mod args;
-pub(crate) mod autoenv;
+pub mod autoenv;
 pub(crate) mod autoenv_trust;
 pub(crate) mod autoenv_untrust;
 pub(crate) mod autoview;
@ -21,7 +20,7 @@ pub(crate) mod chart;
 pub(crate) mod classified;
 #[cfg(feature = "clipboard-cli")]
 pub(crate) mod clip;
-pub(crate) mod command;
+pub mod command;
 pub(crate) mod compact;
 pub(crate) mod config;
 pub(crate) mod constants;
@ -29,7 +28,9 @@ pub(crate) mod count;
 pub(crate) mod cp;
 pub(crate) mod date;
 pub(crate) mod debug;
+pub(crate) mod def;
 pub(crate) mod default;
+pub mod default_context;
 pub(crate) mod describe;
 pub(crate) mod do_;
 pub(crate) mod drop;
@ -62,6 +63,7 @@ pub(crate) mod from_yaml;
 pub(crate) mod get;
 pub(crate) mod group_by;
 pub(crate) mod group_by_date;
+pub(crate) mod hash_;
 pub(crate) mod headers;
 pub(crate) mod help;
 pub(crate) mod histogram;
@ -71,6 +73,8 @@ pub(crate) mod insert;
 pub(crate) mod into_int;
 pub(crate) mod keep;
 pub(crate) mod last;
+pub(crate) mod let_;
+pub(crate) mod let_env;
 pub(crate) mod lines;
 pub(crate) mod ls;
 pub(crate) mod math;
@ -94,7 +98,6 @@ pub(crate) mod reject;
 pub(crate) mod rename;
 pub(crate) mod reverse;
 pub(crate) mod rm;
-pub(crate) mod run_alias;
 pub(crate) mod run_external;
 pub(crate) mod save;
 pub(crate) mod select;
@ -106,11 +109,13 @@ pub(crate) mod size;
 pub(crate) mod skip;
 pub(crate) mod sleep;
 pub(crate) mod sort_by;
+pub(crate) mod source;
 pub(crate) mod split;
 pub(crate) mod split_by;
 pub(crate) mod str_;
 pub(crate) mod table;
 pub(crate) mod tags;
+pub(crate) mod termsize;
 pub(crate) mod to;
 pub(crate) mod to_csv;
 pub(crate) mod to_html;
@ -132,11 +137,7 @@ pub(crate) mod wrap;

 pub(crate) use autoview::Autoview;
 pub(crate) use cd::Cd;
-pub(crate) use command::{
-    whole_stream_command, Command, Example, UnevaluatedCallInfo, WholeStreamCommand,
-};

-pub(crate) use alias::Alias;
 pub(crate) use ansi::Ansi;
 pub(crate) use append::Command as Append;
 pub(crate) use autoenv::Autoenv;
@ -153,8 +154,9 @@ pub(crate) use config::{
 };
 pub(crate) use count::Count;
 pub(crate) use cp::Cpy;
-pub(crate) use date::{Date, DateFormat, DateNow, DateUTC};
+pub(crate) use date::{Date, DateFormat, DateListTimeZone, DateNow, DateToTable, DateToTimeZone};
 pub(crate) use debug::Debug;
+pub(crate) use def::Def;
 pub(crate) use default::Default;
 pub(crate) use describe::Describe;
 pub(crate) use do_::Do;
@ -196,9 +198,10 @@ pub(crate) use from_xlsx::FromXLSX;
 pub(crate) use from_xml::FromXML;
 pub(crate) use from_yaml::FromYAML;
 pub(crate) use from_yaml::FromYML;
-pub(crate) use get::Get;
+pub(crate) use get::Command as Get;
 pub(crate) use group_by::Command as GroupBy;
 pub(crate) use group_by_date::GroupByDate;
+pub(crate) use hash_::{Hash, HashBase64};
 pub(crate) use headers::Headers;
 pub(crate) use help::Help;
 pub(crate) use histogram::Histogram;
@ -207,11 +210,13 @@ pub(crate) use insert::Command as Insert;
 pub(crate) use into_int::IntoInt;
 pub(crate) use keep::{Keep, KeepUntil, KeepWhile};
 pub(crate) use last::Last;
+pub(crate) use let_::Let;
+pub(crate) use let_env::LetEnv;
 pub(crate) use lines::Lines;
 pub(crate) use ls::Ls;
 pub(crate) use math::{
-    Math, MathAverage, MathCeil, MathEval, MathFloor, MathMaximum, MathMedian, MathMinimum,
-    MathMode, MathProduct, MathRound, MathStddev, MathSummation, MathVariance,
+    Math, MathAbs, MathAverage, MathCeil, MathEval, MathFloor, MathMaximum, MathMedian,
+    MathMinimum, MathMode, MathProduct, MathRound, MathStddev, MathSummation, MathVariance,
 };
 pub(crate) use merge::Merge;
 pub(crate) use mkdir::Mkdir;
@ -230,7 +235,9 @@ pub(crate) use prev::Previous;
 pub(crate) use pwd::Pwd;
 #[cfg(feature = "uuid_crate")]
 pub(crate) use random::RandomUUID;
-pub(crate) use random::{Random, RandomBool, RandomDecimal, RandomDice, RandomInteger};
+pub(crate) use random::{
+    Random, RandomBool, RandomChars, RandomDecimal, RandomDice, RandomInteger,
+};
 pub(crate) use range::Range;
 pub(crate) use reduce::Reduce;
 pub(crate) use reject::Reject;
@ -239,7 +246,7 @@ pub(crate) use reverse::Reverse;
 pub(crate) use rm::Remove;
 pub(crate) use run_external::RunExternalCommand;
 pub(crate) use save::Save;
-pub(crate) use select::Select;
+pub(crate) use select::Command as Select;
 pub(crate) use seq::Seq;
 pub(crate) use seq_dates::SeqDates;
 pub(crate) use shells::Shells;
@ -248,21 +255,23 @@ pub(crate) use size::Size;
 pub(crate) use skip::{Skip, SkipUntil, SkipWhile};
 pub(crate) use sleep::Sleep;
 pub(crate) use sort_by::SortBy;
+pub(crate) use source::Source;
 pub(crate) use split::{Split, SplitChars, SplitColumn, SplitRow};
 pub(crate) use split_by::SplitBy;
 pub(crate) use str_::{
    Str, StrCamelCase, StrCapitalize, StrCollect, StrContains, StrDowncase, StrEndsWith,
    StrFindReplace, StrFrom, StrIndexOf, StrKebabCase, StrLPad, StrLength, StrPascalCase, StrRPad,
-    StrReverse, StrScreamingSnakeCase, StrSet, StrSnakeCase, StrStartsWith, StrSubstring,
-    StrToDatetime, StrToDecimal, StrToInteger, StrTrim, StrTrimLeft, StrTrimRight, StrUpcase,
+    StrReverse, StrScreamingSnakeCase, StrSnakeCase, StrStartsWith, StrSubstring, StrToDatetime,
+    StrToDecimal, StrToInteger, StrTrim, StrTrimLeft, StrTrimRight, StrUpcase,
 };
 pub(crate) use table::Table;
 pub(crate) use tags::Tags;
+pub(crate) use termsize::TermSize;
 pub(crate) use to::To;
 pub(crate) use to_csv::ToCSV;
 pub(crate) use to_html::ToHTML;
 pub(crate) use to_json::ToJSON;
-pub(crate) use to_md::ToMarkdown;
+pub(crate) use to_md::Command as ToMarkdown;
 pub(crate) use to_toml::ToTOML;
 pub(crate) use to_tsv::ToTSV;
 pub(crate) use to_url::ToURL;
@ -280,8 +289,8 @@ pub(crate) use wrap::Wrap;
 #[cfg(test)]
 mod tests {
    use super::*;
-    use crate::commands::whole_stream_command;
    use crate::examples::{test_anchors, test_examples};
+    use nu_engine::{whole_stream_command, Command};
    use nu_errors::ShellError;

    fn full_tests() -> Vec<Command> {
@ -292,6 +301,37 @@ mod tests {
            whole_stream_command(Move),
            whole_stream_command(Update),
            whole_stream_command(Empty),
+            // whole_stream_command(Select),
+            // whole_stream_command(Get),
+            // Str Command Suite
+            whole_stream_command(Str),
+            whole_stream_command(StrToDecimal),
+            whole_stream_command(StrToInteger),
+            whole_stream_command(StrDowncase),
+            whole_stream_command(StrUpcase),
+            whole_stream_command(StrCapitalize),
+            whole_stream_command(StrFindReplace),
+            whole_stream_command(StrFrom),
+            whole_stream_command(StrSubstring),
+            whole_stream_command(StrToDatetime),
+            whole_stream_command(StrContains),
+            whole_stream_command(StrIndexOf),
+            whole_stream_command(StrTrim),
+            whole_stream_command(StrTrimLeft),
+            whole_stream_command(StrTrimRight),
+            whole_stream_command(StrStartsWith),
+            whole_stream_command(StrEndsWith),
+            //whole_stream_command(StrCollect),
+            whole_stream_command(StrLength),
+            whole_stream_command(StrLPad),
+            whole_stream_command(StrReverse),
+            whole_stream_command(StrRPad),
+            whole_stream_command(StrCamelCase),
+            whole_stream_command(StrPascalCase),
+            whole_stream_command(StrKebabCase),
+            whole_stream_command(StrSnakeCase),
+            whole_stream_command(StrScreamingSnakeCase),
+            whole_stream_command(ToMarkdown),
        ]
    }

--- a/crates/nu-command/src/commands/ansi.rs
+++ b/crates/nu-command/src/commands/ansi.rs
@ -1,6 +1,6 @@
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
 use ansi_term::Color;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
 use nu_source::Tagged;
@ -9,7 +9,7 @@ pub struct Ansi;

 #[derive(Deserialize)]
 struct AnsiArgs {
-    color: Value,
+    code: Value,
    escape: Option<Tagged<String>>,
    osc: Option<Tagged<String>>,
 }
@ -23,18 +23,18 @@ impl WholeStreamCommand for Ansi {
    fn signature(&self) -> Signature {
        Signature::build("ansi")
            .optional(
-                "color",
+                "code",
                SyntaxShape::Any,
-                "the name of the color to use or 'reset' to reset the color",
+                "the name of the code to use like 'green' or 'reset' to reset the color",
            )
            .named(
-                "escape", // \x1b
+                "escape", // \x1b[
                SyntaxShape::Any,
                "escape sequence without the escape character(s)",
                Some('e'),
            )
            .named(
-                "osc",
+                "osc", // \x1b]
                SyntaxShape::Any,
                "operating system command (ocs) escape sequence without the escape character(s)",
                Some('o'),
@ -118,12 +118,8 @@ Format: #
        ]
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        let (AnsiArgs { color, escape, osc }, _) = args.process(&registry).await?;
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        let (AnsiArgs { code, escape, osc }, _) = args.process().await?;

        if let Some(e) = escape {
            let esc_vec: Vec<char> = e.item.chars().collect();
@ -149,6 +145,7 @@ Format: #
                    o.tag(),
                ));
            }
+
            //Operating system command aka osc  ESC ] <- note the right brace, not left brace for osc
            // OCS's need to end with a bell '\x07' char
            let output = format!("\x1b]{};", o.item);
@ -157,25 +154,24 @@ Format: #
            )));
        }

-        let color_string = color.as_string()?;
-        let ansi_code = str_to_ansi_color(color_string);
+        let code_string = code.as_string()?;
+        let ansi_code = str_to_ansi(code_string);

        if let Some(output) = ansi_code {
            Ok(OutputStream::one(ReturnSuccess::value(
-                UntaggedValue::string(output).into_value(color.tag()),
+                UntaggedValue::string(output).into_value(code.tag()),
            )))
        } else {
            Err(ShellError::labeled_error(
-                "Unknown color",
-                "unknown color",
-                color.tag(),
+                "Unknown ansi code",
+                "unknown ansi code",
+                code.tag(),
            ))
        }
-        // }
    }
 }

-pub fn str_to_ansi_color(s: String) -> Option<String> {
+pub fn str_to_ansi(s: String) -> Option<String> {
    match s.as_str() {
        "g" | "green" => Some(Color::Green.prefix().to_string()),
        "gb" | "green_bold" => Some(Color::Green.bold().prefix().to_string()),
@ -226,6 +222,57 @@ pub fn str_to_ansi_color(s: String) -> Option<String> {
        "wd" | "white_dimmed" => Some(Color::White.dimmed().prefix().to_string()),
        "wr" | "white_reverse" => Some(Color::White.reverse().prefix().to_string()),
        "reset" => Some("\x1b[0m".to_owned()),
+
+        // Reference for ansi codes https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797
+        // Another good reference http://ascii-table.com/ansi-escape-sequences.php
+
+        // For setting title like `echo [$(char title) $(pwd) $(char bel)] | str collect`
+        "title" => Some("\x1b]2;".to_string()), // ESC]2; xterm sets window title using OSC syntax escapes
+        "bel" => Some('\x07'.to_string()),      // Terminal Bell
+        "backspace" => Some('\x08'.to_string()), // Backspace
+
+        // Ansi Erase Sequences
+        "clear_screen" => Some("\x1b[J".to_string()), // clears the screen
+        "clear_screen_from_cursor_to_end" => Some("\x1b[0J".to_string()), // clears from cursor until end of screen
+        "clear_screen_from_cursor_to_beginning" => Some("\x1b[1J".to_string()), // clears from cursor to beginning of screen
+        "cls" | "clear_entire_screen" => Some("\x1b[2J".to_string()), // clears the entire screen
+        "erase_line" => Some("\x1b[K".to_string()),                   // clears the current line
+        "erase_line_from_cursor_to_end" => Some("\x1b[0K".to_string()), // clears from cursor to end of line
+        "erase_line_from_cursor_to_beginning" => Some("\x1b[1K".to_string()), // clears from cursor to start of line
+        "erase_entire_line" => Some("\x1b[2K".to_string()),                   // clears entire line
+
+        // Turn on/off cursor
+        "cursor_off" => Some("\x1b[?25l".to_string()),
+        "cursor_on" => Some("\x1b[?25h".to_string()),
+
+        // Turn on/off blinking
+        "cursor_blink_off" => Some("\x1b[?12l".to_string()),
+        "cursor_blink_on" => Some("\x1b[?12h".to_string()),
+
+        // Cursor position in ESC [ <r>;<c>R where r = row and c = column
+        "cursor_position" => Some("\x1b[6n".to_string()),
+
+        // Report Terminal Identity
+        "identity" => Some("\x1b[0c".to_string()),
+
+        // Ansi escape only - CSI command
+        "csi" | "escape" | "escape_left" => Some("\x1b[".to_string()),
+        // OSC escape (Operating system command)
+        "osc" | "escape_right" => Some("\x1b]".to_string()),
+
+        // Ansi RGB - Needs to be 32;2;r;g;b or 48;2;r;g;b
+        // assuming the rgb will be passed via command and no here
+        "rgb_fg" => Some("\x1b[32;2;".to_string()),
+        "rgb_bg" => Some("\x1b[48;2;".to_string()),
+
+        // Ansi color index - Needs 38;5;idx or 48;5;idx where idx = 0 to 255
+        "idx_fg" | "color_idx_fg" => Some("\x1b[38;5;".to_string()),
+        "idx_bg" | "color_idx_bg" => Some("\x1b[48;5;".to_string()),
+
+        // Returns terminal size like "[<r>;<c>R" where r is rows and c is columns
+        // This should work assuming your terminal is not greater than 999x999
+        "size" => Some("\x1b[s\x1b[999;999H\x1b[6n\x1b[u".to_string()),
+
        _ => None,
    }
 }
@ -239,6 +286,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Ansi {})?)
+        test_examples(Ansi {})
    }
 }
--- a/crates/nu-command/src/commands/append.rs
+++ b/crates/nu-command/src/commands/append.rs
@ -1,6 +1,5 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};

@ -29,12 +28,8 @@ impl WholeStreamCommand for Command {
        "Append a row to the table"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        let (Arguments { mut value }, input) = args.process(registry).await?;
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        let (Arguments { mut value }, input) = args.process().await?;

        let input: Vec<Value> = input.collect().await;

--- a/crates/nu-command/src/commands/args.rs
+++ b/crates/nu-command/src/commands/args.rs
--- a/crates/nu-command/src/commands/autoenv.rs
+++ b/crates/nu-command/src/commands/autoenv.rs
@ -1,12 +1,12 @@
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, UntaggedValue};
 use serde::Deserialize;
 use serde::Serialize;
 use sha2::{Digest, Sha256};
 use std::io::Read;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 pub struct Autoenv;

 #[derive(Deserialize, Serialize, Debug, Default)]
@ -20,11 +20,12 @@ impl Trusted {
        }
    }
 }
-pub fn file_is_trusted(nu_env_file: &PathBuf, content: &[u8]) -> Result<bool, ShellError> {
+pub fn file_is_trusted(nu_env_file: &Path, content: &[u8]) -> Result<bool, ShellError> {
    let contentdigest = Sha256::digest(&content).as_slice().to_vec();
    let nufile = std::fs::canonicalize(nu_env_file)?;

    let trusted = read_trusted()?;
+
    Ok(trusted.files.get(&nufile.to_string_lossy().to_string()) == Some(&contentdigest))
 }

@ -61,15 +62,9 @@ The file can contain several optional sections:
    fn signature(&self) -> Signature {
        Signature::build("autoenv")
    }
-    async fn run(
-        &self,
-        _args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        let registry = registry.clone();
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        Ok(OutputStream::one(ReturnSuccess::value(
-            UntaggedValue::string(crate::commands::help::get_help(&Autoenv, &registry))
-                .into_value(Tag::unknown()),
+            UntaggedValue::string(get_help(&Autoenv, &args.scope)).into_value(Tag::unknown()),
        )))
    }

@ -77,15 +72,15 @@ The file can contain several optional sections:
        vec![Example {
            description: "Example .nu-env file",
            example: r#"cat .nu-env
-    [env]
-    mykey = "myvalue"
+        [env]
+        mykey = "myvalue"

-    [scriptvars]
-    myscript = "echo myval"
+        [scriptvars]
+        myscript = "echo myval"

-    [scripts]
-    entryscripts = ["touch hello.txt", "touch hello2.txt"]
-    exitscripts = ["touch bye.txt"]"#,
+        [scripts]
+        entryscripts = ["touch hello.txt", "touch hello2.txt"]
+        exitscripts = ["touch bye.txt"]"#,
            result: None,
        }]
    }
--- a/crates/nu-command/src/commands/autoenv_trust.rs
+++ b/crates/nu-command/src/commands/autoenv_trust.rs
@ -1,6 +1,6 @@
 use super::autoenv::read_trusted;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::SyntaxShape;
 use nu_protocol::{Primitive, ReturnSuccess, Signature, UntaggedValue, Value};
@ -22,14 +22,11 @@ impl WholeStreamCommand for AutoenvTrust {
        "Trust a .nu-env file in the current or given directory"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        let tag = args.call_info.name_tag.clone();
+        let ctx = EvaluationContext::from_args(&args);

-        let file_to_trust = match args.call_info.evaluate(registry).await?.args.nth(0) {
+        let file_to_trust = match args.call_info.evaluate(&ctx).await?.args.nth(0) {
            Some(Value {
                value: UntaggedValue::Primitive(Primitive::String(ref path)),
                tag: _,
--- a/crates/nu-command/src/commands/autoenv_untrust.rs
+++ b/crates/nu-command/src/commands/autoenv_untrust.rs
@ -1,6 +1,6 @@
 use super::autoenv::Trusted;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::SyntaxShape;
 use nu_protocol::{Primitive, ReturnSuccess, Signature, UntaggedValue, Value};
@ -26,13 +26,10 @@ impl WholeStreamCommand for AutoenvUnTrust {
        "Untrust a .nu-env file in the current or given directory"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        let tag = args.call_info.name_tag.clone();
-        let file_to_untrust = match args.call_info.evaluate(registry).await?.args.nth(0) {
+        let ctx = EvaluationContext::from_args(&args);
+        let file_to_untrust = match args.call_info.evaluate(&ctx).await?.args.nth(0) {
            Some(Value {
                value: UntaggedValue::Primitive(Primitive::String(ref path)),
                tag: _,
--- a/crates/nu-command/src/commands/autoview/command.rs
+++ b/crates/nu-command/src/commands/autoview/command.rs
@ -1,11 +1,11 @@
 use crate::commands::autoview::options::{ConfigExtensions, NuConfig as AutoViewConfiguration};
-use crate::commands::{UnevaluatedCallInfo, WholeStreamCommand};
 use crate::prelude::*;
 use crate::primitive::get_color_config;
 use nu_data::value::format_leaf;
+use nu_engine::{UnevaluatedCallInfo, WholeStreamCommand};
 use nu_errors::ShellError;
 use nu_protocol::hir::{self, Expression, ExternalRedirection, Literal, SpannedExpression};
-use nu_protocol::{Primitive, Scope, Signature, UntaggedValue, Value};
+use nu_protocol::{Primitive, Signature, UntaggedValue, Value};
 use nu_table::TextStyle;
 use parking_lot::Mutex;
 use std::sync::atomic::AtomicBool;
@ -26,20 +26,15 @@ impl WholeStreamCommand for Command {
        "View the contents of the pipeline as a table or list."
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        autoview(RunnableContext {
            input: args.input,
-            registry: registry.clone(),
+            scope: args.scope.clone(),
            shell_manager: args.shell_manager,
            host: args.host,
            ctrl_c: args.ctrl_c,
            current_errors: args.current_errors,
            name: args.call_info.name_tag,
-            raw_input: args.raw_input,
        })
        .await
    }
@ -65,7 +60,7 @@ pub struct RunnableContextWithoutInput {
    pub host: Arc<parking_lot::Mutex<Box<dyn Host>>>,
    pub current_errors: Arc<Mutex<Vec<ShellError>>>,
    pub ctrl_c: Arc<AtomicBool>,
-    pub registry: CommandRegistry,
+    pub scope: Scope,
    pub name: Tag,
 }

@ -76,7 +71,7 @@ impl RunnableContextWithoutInput {
            host: context.host,
            ctrl_c: context.ctrl_c,
            current_errors: context.current_errors,
-            registry: context.registry,
+            scope: context.scope,
            name: context.name,
        };
        (context.input, new_context)
@ -109,7 +104,7 @@ pub async fn autoview(context: RunnableContext) -> Result<OutputStream, ShellErr

                if let Some(table) = table {
                    let command_args = create_default_command_args(&context).with_input(stream);
-                    let result = table.run(command_args, &context.registry).await?;
+                    let result = table.run(command_args).await?;
                    result.collect::<Vec<_>>().await;
                }
            }
@ -126,7 +121,7 @@ pub async fn autoview(context: RunnableContext) -> Result<OutputStream, ShellErr
                            );
                            let command_args =
                                create_default_command_args(&context).with_input(stream);
-                            let result = text.run(command_args, &context.registry).await?;
+                            let result = text.run(command_args).await?;
                            result.collect::<Vec<_>>().await;
                        } else {
                            out!("{}", s);
@ -139,30 +134,7 @@ pub async fn autoview(context: RunnableContext) -> Result<OutputStream, ShellErr
                        out!("{}", s);
                    }
                    Value {
-                        value: UntaggedValue::Primitive(Primitive::Line(ref s)),
-                        tag: Tag { anchor, span },
-                    } if anchor.is_some() => {
-                        if let Some(text) = text {
-                            let mut stream = VecDeque::new();
-                            stream.push_back(
-                                UntaggedValue::string(s).into_value(Tag { anchor, span }),
-                            );
-                            let command_args =
-                                create_default_command_args(&context).with_input(stream);
-                            let result = text.run(command_args, &context.registry).await?;
-                            result.collect::<Vec<_>>().await;
-                        } else {
-                            out!("{}\n", s);
-                        }
-                    }
-                    Value {
-                        value: UntaggedValue::Primitive(Primitive::Line(s)),
-                        ..
-                    } => {
-                        out!("{}\n", s);
-                    }
-                    Value {
-                        value: UntaggedValue::Primitive(Primitive::Path(s)),
+                        value: UntaggedValue::Primitive(Primitive::FilePath(s)),
                        ..
                    } => {
                        out!("{}", s.display());
@ -201,6 +173,13 @@ pub async fn autoview(context: RunnableContext) -> Result<OutputStream, ShellErr
                        let output = format_leaf(&x).plain_string(100_000);
                        out!("{}", output);
                    }
+                    Value {
+                        value: UntaggedValue::Primitive(Primitive::Filesize(_)),
+                        ..
+                    } => {
+                        let output = format_leaf(&x).plain_string(100_000);
+                        out!("{}", output);
+                    }
                    Value {
                        value: UntaggedValue::Primitive(Primitive::Date(d)),
                        ..
@ -224,7 +203,7 @@ pub async fn autoview(context: RunnableContext) -> Result<OutputStream, ShellErr
                            stream.push_back(x);
                            let command_args =
                                create_default_command_args(&context).with_input(stream);
-                            let result = binary.run(command_args, &context.registry).await?;
+                            let result = binary.run(command_args).await?;
                            result.collect::<Vec<_>>().await;
                        } else {
                            use pretty_hex::*;
@ -276,7 +255,12 @@ pub async fn autoview(context: RunnableContext) -> Result<OutputStream, ShellErr

                        nu_table::draw_table(&table, term_width, &color_hm);
                    }
-
+                    Value {
+                        value: UntaggedValue::Primitive(Primitive::Nothing),
+                        ..
+                    } => {
+                        // Do nothing
+                    }
                    Value {
                        value: ref item, ..
                    } => {
@ -285,7 +269,7 @@ pub async fn autoview(context: RunnableContext) -> Result<OutputStream, ShellErr
                            stream.push_back(x);
                            let command_args =
                                create_default_command_args(&context).with_input(stream);
-                            let result = table.run(command_args, &context.registry).await?;
+                            let result = table.run(command_args).await?;
                            result.collect::<Vec<_>>().await;
                        } else {
                            out!("{:?}", item);
@ -318,8 +302,8 @@ fn create_default_command_args(context: &RunnableContextWithoutInput) -> RawComm
                external_redirection: ExternalRedirection::Stdout,
            },
            name_tag: context.name.clone(),
-            scope: Scope::create(),
        },
+        scope: Scope::new(),
    }
 }

@ -332,6 +316,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Command {})?)
+        test_examples(Command {})
    }
 }
--- a/crates/nu-command/src/commands/autoview/mod.rs
+++ b/crates/nu-command/src/commands/autoview/mod.rs
--- a/crates/nu-command/src/commands/autoview/options.rs
+++ b/crates/nu-command/src/commands/autoview/options.rs
--- a/crates/nu-command/src/commands/benchmark.rs
+++ b/crates/nu-command/src/commands/benchmark.rs
@ -1,12 +1,12 @@
-use crate::commands::classified::block::run_block;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
-#[cfg(feature = "rich-benchmark")]
-use heim::cpu::time;
+// #[cfg(feature = "rich-benchmark")]
+// use heim::cpu::time;
+use nu_engine::run_block;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{
-    hir::{Block, ClassifiedCommand, Commands, InternalCommand},
-    Dictionary, Scope, Signature, SyntaxShape, UntaggedValue, Value,
+    hir::{Block, CapturedBlock, ClassifiedCommand, Group, InternalCommand, Pipeline},
+    Dictionary, Signature, SyntaxShape, UntaggedValue, Value,
 };
 use rand::{
    distributions::Alphanumeric,
@ -19,8 +19,8 @@ pub struct Benchmark;

 #[derive(Deserialize, Debug)]
 struct BenchmarkArgs {
-    block: Block,
-    passthrough: Option<Block>,
+    block: CapturedBlock,
+    passthrough: Option<CapturedBlock>,
 }

 #[async_trait]
@ -48,12 +48,8 @@ impl WholeStreamCommand for Benchmark {
        "Runs a block and returns the time it took to execute it"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        benchmark(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        benchmark(args).await
    }

    fn examples(&self) -> Vec<Example> {
@ -72,78 +68,73 @@ impl WholeStreamCommand for Benchmark {
    }
 }

-async fn benchmark(
-    raw_args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-
+async fn benchmark(raw_args: CommandArgs) -> Result<OutputStream, ShellError> {
    let tag = raw_args.call_info.args.span;
-    let mut context = EvaluationContext::from_raw(&raw_args, &registry);
-    let scope = raw_args.call_info.scope.clone();
-    let (BenchmarkArgs { block, passthrough }, input) = raw_args.process(&registry).await?;
+    let mut context = EvaluationContext::from_args(&raw_args);
+    let scope = raw_args.scope.clone();
+    let (BenchmarkArgs { block, passthrough }, input) = raw_args.process().await?;

-    let env = scope.env();
+    let env = scope.get_env_vars();
    let name = generate_free_name(&env);
-    let mut env = IndexMap::new();
-    env.insert(name, generate_random_env_value());
-    let scope = Scope::append_env(scope, env);
+
+    scope.add_env_var(name, generate_random_env_value());

    let start_time = Instant::now();

-    #[cfg(feature = "rich-benchmark")]
-    let start = time().await;
+    // #[cfg(feature = "rich-benchmark")]
+    // let start = time().await;

-    let result = run_block(&block, &mut context, input, scope.clone()).await;
+    context.scope.enter_scope();
+    let result = run_block(&block.block, &context, input).await;
+    context.scope.exit_scope();
    let output = result?.into_vec().await;

-    #[cfg(feature = "rich-benchmark")]
-    let end = time().await;
+    // #[cfg(feature = "rich-benchmark")]
+    // let end = time().await;

    let end_time = Instant::now();
    context.clear_errors();

    // return basic runtime
-    #[cfg(not(feature = "rich-benchmark"))]
+    //#[cfg(not(feature = "rich-benchmark"))]
    {
        let mut indexmap = IndexMap::with_capacity(1);

        let real_time = into_big_int(end_time - start_time);
        indexmap.insert("real time".to_string(), real_time);
-        benchmark_output(indexmap, output, passthrough, &tag, &mut context, scope).await
+        benchmark_output(indexmap, output, passthrough, &tag, &mut context).await
    }
    // return advanced stats
-    #[cfg(feature = "rich-benchmark")]
-    if let (Ok(start), Ok(end)) = (start, end) {
-        let mut indexmap = IndexMap::with_capacity(4);
+    // #[cfg(feature = "rich-benchmark")]
+    // if let (Ok(start), Ok(end)) = (start, end) {
+    //     let mut indexmap = IndexMap::with_capacity(4);

-        let real_time = into_big_int(end_time - start_time);
-        indexmap.insert("real time".to_string(), real_time);
+    //     let real_time = into_big_int(end_time - start_time);
+    //     indexmap.insert("real time".to_string(), real_time);

-        let user_time = into_big_int(end.user() - start.user());
-        indexmap.insert("user time".to_string(), user_time);
+    //     let user_time = into_big_int(end.user() - start.user());
+    //     indexmap.insert("user time".to_string(), user_time);

-        let system_time = into_big_int(end.system() - start.system());
-        indexmap.insert("system time".to_string(), system_time);
+    //     let system_time = into_big_int(end.system() - start.system());
+    //     indexmap.insert("system time".to_string(), system_time);

-        let idle_time = into_big_int(end.idle() - start.idle());
-        indexmap.insert("idle time".to_string(), idle_time);
+    //     let idle_time = into_big_int(end.idle() - start.idle());
+    //     indexmap.insert("idle time".to_string(), idle_time);

-        benchmark_output(indexmap, output, passthrough, &tag, &mut context, scope).await
-    } else {
-        Err(ShellError::untagged_runtime_error(
-            "Could not retreive CPU time",
-        ))
-    }
+    //     benchmark_output(indexmap, output, passthrough, &tag, &mut context).await
+    // } else {
+    //     Err(ShellError::untagged_runtime_error(
+    //         "Could not retrieve CPU time",
+    //     ))
+    // }
 }

 async fn benchmark_output<T, Output>(
    indexmap: IndexMap<String, BigInt>,
    block_output: Output,
-    passthrough: Option<Block>,
+    passthrough: Option<CapturedBlock>,
    tag: T,
    context: &mut EvaluationContext,
-    scope: Arc<Scope>,
 ) -> Result<OutputStream, ShellError>
 where
    T: Into<Tag> + Copy,
@ -161,9 +152,12 @@ where
        let benchmark_output = InputStream::one(value);

        // add autoview for an empty block
-        let time_block = add_implicit_autoview(time_block);
+        let time_block = add_implicit_autoview(time_block.block);

-        let _ = run_block(&time_block, context, benchmark_output, scope).await?;
+        context.scope.enter_scope();
+        let result = run_block(&time_block, context, benchmark_output).await;
+        context.scope.exit_scope();
+        result?;
        context.clear_errors();

        Ok(block_output.into())
@ -175,15 +169,19 @@ where

 fn add_implicit_autoview(mut block: Block) -> Block {
    if block.block.is_empty() {
-        block.push({
-            let mut commands = Commands::new(block.span);
-            commands.push(ClassifiedCommand::Internal(InternalCommand::new(
-                "autoview".to_string(),
-                block.span,
-                block.span,
-            )));
-            commands
-        });
+        let group = Group::new(
+            vec![{
+                let mut commands = Pipeline::new(block.span);
+                commands.push(ClassifiedCommand::Internal(InternalCommand::new(
+                    "autoview".to_string(),
+                    block.span,
+                    block.span,
+                )));
+                commands
+            }],
+            block.span,
+        );
+        block.push(group);
    }
    block
 }
--- a/crates/nu-command/src/commands/build_string.rs
+++ b/crates/nu-command/src/commands/build_string.rs
@ -1,8 +1,8 @@
 use crate::prelude::*;
 use nu_errors::ShellError;

-use crate::commands::WholeStreamCommand;
 use nu_data::value::format_leaf;
+use nu_engine::WholeStreamCommand;
 use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};

 #[derive(Deserialize)]
@ -27,13 +27,9 @@ impl WholeStreamCommand for BuildString {
        "Builds a string from the arguments"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        let tag = args.call_info.name_tag.clone();
-        let (BuildStringArgs { rest }, _) = args.process(&registry).await?;
+        let (BuildStringArgs { rest }, _) = args.process().await?;

        let mut output_string = String::new();

--- a/crates/nu-command/src/commands/cal.rs
+++ b/crates/nu-command/src/commands/cal.rs
@ -1,7 +1,7 @@
-use crate::commands::{command::EvaluatedWholeStreamCommandArgs, WholeStreamCommand};
 use crate::prelude::*;
 use chrono::{Datelike, Local, NaiveDate};
 use indexmap::IndexMap;
+use nu_engine::{EvaluatedWholeStreamCommandArgs, WholeStreamCommand};
 use nu_errors::ShellError;
 use nu_protocol::{Dictionary, Signature, SyntaxShape, UntaggedValue, Value};

@ -41,12 +41,8 @@ impl WholeStreamCommand for Cal {
        "Display a calendar."
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        cal(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        cal(args).await
    }

    fn examples(&self) -> Vec<Example> {
@ -70,12 +66,8 @@ impl WholeStreamCommand for Cal {
    }
 }

-pub async fn cal(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-    let args = args.evaluate_once(&registry).await?;
+pub async fn cal(args: CommandArgs) -> Result<OutputStream, ShellError> {
+    let args = args.evaluate_once().await?;
    let mut calendar_vec_deque = VecDeque::new();
    let tag = args.call_info.name_tag.clone();

@ -345,6 +337,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Cal {})?)
+        test_examples(Cal {})
    }
 }
--- a/crates/nu-command/src/commands/cd.rs
+++ b/crates/nu-command/src/commands/cd.rs
@ -1,16 +1,9 @@
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;

-use std::path::PathBuf;
-
+use nu_engine::shell::CdArgs;
 use nu_errors::ShellError;
 use nu_protocol::{Signature, SyntaxShape};
-use nu_source::Tagged;
-
-#[derive(Deserialize)]
-pub struct CdArgs {
-    pub(crate) path: Option<Tagged<PathBuf>>,
-}

 pub struct Cd;

@ -23,7 +16,7 @@ impl WholeStreamCommand for Cd {
    fn signature(&self) -> Signature {
        Signature::build("cd").optional(
            "directory",
-            SyntaxShape::Path,
+            SyntaxShape::FilePath,
            "the directory to change to",
        )
    }
@ -32,14 +25,10 @@ impl WholeStreamCommand for Cd {
        "Change to a new path."
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        let name = args.call_info.name_tag.clone();
        let shell_manager = args.shell_manager.clone();
-        let (args, _): (CdArgs, _) = args.process(&registry).await?;
+        let (args, _): (CdArgs, _) = args.process().await?;
        shell_manager.cd(args, name)
    }

@ -78,6 +67,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Cd {})?)
+        test_examples(Cd {})
    }
 }
--- a/crates/nu-command/src/commands/char_.rs
+++ b/crates/nu-command/src/commands/char_.rs
@ -1,5 +1,5 @@
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
 use nu_source::Tagged;
@ -19,7 +19,7 @@ impl WholeStreamCommand for Char {
    }

    fn signature(&self) -> Signature {
-        Signature::build("ansi")
+        Signature::build("char")
            .required(
                "character",
                SyntaxShape::Any,
@ -56,12 +56,8 @@ impl WholeStreamCommand for Char {
        ]
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        let (CharArgs { name, unicode }, _) = args.process(&registry).await?;
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        let (CharArgs { name, unicode }, _) = args.process().await?;

        if unicode {
            let decoded_char = string_to_unicode_char(&name.item);
@ -134,24 +130,6 @@ fn str_to_character(s: &str) -> Option<String> {
        "snowy" | "snow" => Some("❄️".to_string()),
        "thunderstorm" | "thunder" => Some("🌩️".to_string()),

-        // Reference for ansi codes https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797
-        // Another good reference http://ascii-table.com/ansi-escape-sequences.php
-
-        // For setting title like `echo [$(char title) $(pwd) $(char bel)] | str collect`
-        "title" => Some("\x1b]2;".to_string()), // ESC]2; xterm sets window title
-        "bel" => Some('\x07'.to_string()),      // Terminal Bell
-        "backspace" => Some('\x08'.to_string()), // Backspace
-
-        // Ansi Erase Sequences
-        "clear_screen" => Some("\x1b[J".to_string()), // clears the screen
-        "clear_screen_from_cursor_to_end" => Some("\x1b[0J".to_string()), // clears from cursor until end of screen
-        "clear_screen_from_cursor_to_beginning" => Some("\x1b[1J".to_string()), // clears from cursor to beginning of screen
-        "cls" | "clear_entire_screen" => Some("\x1b[2J".to_string()), // clears the entire screen
-        "erase_line" => Some("\x1b[K".to_string()),                   // clears the current line
-        "erase_line_from_cursor_to_end" => Some("\x1b[0K".to_string()), // clears from cursor to end of line
-        "erase_line_from_cursor_to_beginning" => Some("\x1b[1K".to_string()), // clears from cursor to start of line
-        "erase_entire_line" => Some("\x1b[2K".to_string()),                   // clears entire line
-
        _ => None,
    }
 }
@ -165,6 +143,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Char {})?)
+        test_examples(Char {})
    }
 }
--- a/crates/nu-command/src/commands/chart.rs
+++ b/crates/nu-command/src/commands/chart.rs
@ -1,5 +1,5 @@
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, UntaggedValue};

@ -20,21 +20,15 @@ impl WholeStreamCommand for Chart {
        "Displays charts."
    }

-    async fn run(
-        &self,
-        _args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        if registry.get_command("chart bar").is_none() {
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        if args.scope.get_command("chart bar").is_none() {
            return Err(ShellError::untagged_runtime_error(
                "nu_plugin_chart not installed.",
            ));
        }

-        let registry = registry.clone();
        Ok(OutputStream::one(Ok(ReturnSuccess::Value(
-            UntaggedValue::string(crate::commands::help::get_help(&Chart, &registry))
-                .into_value(Tag::unknown()),
+            UntaggedValue::string(get_help(&Chart, &args.scope)).into_value(Tag::unknown()),
        ))))
    }
 }
@ -48,6 +42,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Chart {})?)
+        test_examples(Chart {})
    }
 }
--- a/crates/nu-command/src/commands/classified/dynamic.rs
+++ b/crates/nu-command/src/commands/classified/dynamic.rs
--- a/crates/nu-command/src/commands/classified/external.rs
+++ b/crates/nu-command/src/commands/classified/external.rs
@ -1,7 +1,7 @@
-use crate::commands::classified::maybe_text_codec::{MaybeTextCodec, StringOrBinary};
-use crate::evaluate::evaluate_baseline_expr;
 use crate::futures::ThreadedReceiver;
 use crate::prelude::*;
+use nu_engine::evaluate_baseline_expr;
+use nu_engine::{MaybeTextCodec, StringOrBinary};

 use std::borrow::Cow;
 use std::io::Write;
@ -16,14 +16,14 @@ use log::trace;
 use nu_errors::ShellError;
 use nu_protocol::hir::Expression;
 use nu_protocol::hir::{ExternalCommand, ExternalRedirection};
-use nu_protocol::{Primitive, Scope, ShellTypeName, UntaggedValue, Value};
+use nu_protocol::{Primitive, ShellTypeName, UntaggedValue, Value};
 use nu_source::Tag;
+use nu_stream::trace_stream;

 pub(crate) async fn run_external_command(
    command: ExternalCommand,
    context: &mut EvaluationContext,
    input: InputStream,
-    scope: Arc<Scope>,
    external_redirection: ExternalRedirection,
 ) -> Result<InputStream, ShellError> {
    trace!(target: "nu::run::external", "-> {}", command.name);
@ -36,14 +36,13 @@ pub(crate) async fn run_external_command(
        ));
    }

-    run_with_stdin(command, context, input, scope, external_redirection).await
+    run_with_stdin(command, context, input, external_redirection).await
 }

 async fn run_with_stdin(
    command: ExternalCommand,
    context: &mut EvaluationContext,
    input: InputStream,
-    scope: Arc<Scope>,
    external_redirection: ExternalRedirection,
 ) -> Result<InputStream, ShellError> {
    let path = context.shell_manager.path();
@ -53,7 +52,7 @@ async fn run_with_stdin(
    let mut command_args = vec![];
    for arg in command.args.iter() {
        let is_literal = matches!(arg.expr, Expression::Literal(_));
-        let value = evaluate_baseline_expr(arg, &context.registry, scope.clone()).await?;
+        let value = evaluate_baseline_expr(arg, context).await?;

        // Skip any arguments that don't really exist, treating them as optional
        // FIXME: we may want to preserve the gap in the future, though it's hard to say
@ -97,7 +96,7 @@ async fn run_with_stdin(

            #[cfg(feature = "dirs")]
            {
-                home_dir = dirs::home_dir;
+                home_dir = dirs_next::home_dir;
            }
            #[cfg(not(feature = "dirs"))]
            {
@ -132,7 +131,7 @@ async fn run_with_stdin(
        &process_args[..],
        input,
        external_redirection,
-        scope,
+        &context.scope,
    )
 }

@ -142,7 +141,7 @@ fn spawn(
    args: &[String],
    input: InputStream,
    external_redirection: ExternalRedirection,
-    scope: Arc<Scope>,
+    scope: &Scope,
 ) -> Result<InputStream, ShellError> {
    let command = command.clone();

@ -173,7 +172,7 @@ fn spawn(
    trace!(target: "nu::run::external", "cwd = {:?}", &path);

    process.env_clear();
-    process.envs(scope.env());
+    process.envs(scope.get_env_vars());

    // We want stdout regardless of what
    // we are doing ($it case or pipe stdin)
@ -223,8 +222,7 @@ fn spawn(
                for value in block_on_stream(input) {
                    match &value.value {
                        UntaggedValue::Primitive(Primitive::Nothing) => continue,
-                        UntaggedValue::Primitive(Primitive::String(s))
-                        | UntaggedValue::Primitive(Primitive::Line(s)) => {
+                        UntaggedValue::Primitive(Primitive::String(s)) => {
                            if stdin_write.write(s.as_bytes()).is_err() {
                                // Other side has closed, so exit
                                return Ok(());
@ -466,7 +464,7 @@ pub fn did_find_command(#[allow(unused)] name: &str) -> bool {
            let cmd_builtins = [
                "assoc", "break", "color", "copy", "date", "del", "dir", "dpath", "echo", "erase",
                "for", "ftype", "md", "mkdir", "mklink", "move", "path", "ren", "rename", "rd",
-                "rmdir", "set", "start", "time", "title", "type", "ver", "verify", "vol",
+                "rmdir", "start", "time", "title", "type", "ver", "verify", "vol",
            ];

            cmd_builtins.contains(&name)
@ -535,17 +533,16 @@ mod tests {
        add_double_quotes, argument_is_quoted, escape_double_quotes, expand_tilde, remove_quotes,
    };
    #[cfg(feature = "which")]
-    use super::{run_external_command, EvaluationContext, InputStream};
+    use super::{run_external_command, InputStream};

    #[cfg(feature = "which")]
    use futures::executor::block_on;
    #[cfg(feature = "which")]
+    use nu_engine::basic_evaluation_context;
+    #[cfg(feature = "which")]
    use nu_errors::ShellError;
    #[cfg(feature = "which")]
-    use nu_protocol::Scope;
-    #[cfg(feature = "which")]
    use nu_test_support::commands::ExternalBuilder;
-
    // async fn read(mut stream: OutputStream) -> Option<Value> {
    //     match stream.try_next().await {
    //         Ok(val) => {
@ -566,17 +563,13 @@ mod tests {

        let input = InputStream::empty();
        let mut ctx =
-            EvaluationContext::basic().expect("There was a problem creating a basic context.");
+            basic_evaluation_context().expect("There was a problem creating a basic context.");

-        assert!(run_external_command(
-            cmd,
-            &mut ctx,
-            input,
-            Scope::create(),
-            ExternalRedirection::Stdout
-        )
-        .await
-        .is_err());
+        assert!(
+            run_external_command(cmd, &mut ctx, input, ExternalRedirection::Stdout)
+                .await
+                .is_err()
+        );

        Ok(())
    }
@ -584,7 +577,7 @@ mod tests {
    // async fn failure_run() -> Result<(), ShellError> {
    //     let cmd = ExternalBuilder::for_name("fail").build();

-    //     let mut ctx = EvaluationContext::basic().expect("There was a problem creating a basic context.");
+    //     let mut ctx = crate::cli::basic_evaluation_context().expect("There was a problem creating a basic context.");
    //     let stream = run_external_command(cmd, &mut ctx, None, false)
    //         .await?
    //         .expect("There was a problem running the external command.");
--- a/crates/nu-command/src/commands/classified/mod.rs
+++ b/crates/nu-command/src/commands/classified/mod.rs
@ -0,0 +1,5 @@
+mod dynamic;
+pub(crate) mod external;
+
+#[allow(unused_imports)]
+pub(crate) use dynamic::Command as DynamicCommand;
--- a/crates/nu-command/src/commands/clear.rs
+++ b/crates/nu-command/src/commands/clear.rs
@ -1,5 +1,5 @@
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::Signature;
 use std::process::Command;
@ -20,7 +20,7 @@ impl WholeStreamCommand for Clear {
        "Clears the terminal"
    }

-    async fn run(&self, _: CommandArgs, _: &CommandRegistry) -> Result<OutputStream, ShellError> {
+    async fn run(&self, _: CommandArgs) -> Result<OutputStream, ShellError> {
        if cfg!(windows) {
            Command::new("cmd")
                .args(&["/C", "cls"])
--- a/crates/nu-command/src/commands/clip.rs
+++ b/crates/nu-command/src/commands/clip.rs
@ -1,11 +1,10 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
 use futures::stream::StreamExt;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{Signature, Value};

-use clipboard::{ClipboardContext, ClipboardProvider};
+use arboard::Clipboard;

 pub struct Clip;

@ -23,12 +22,8 @@ impl WholeStreamCommand for Clip {
        "Copy the contents of the pipeline to the copy/paste buffer"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        clip(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        clip(args).await
    }

    fn examples(&self) -> Vec<Example> {
@ -47,16 +42,12 @@ impl WholeStreamCommand for Clip {
    }
 }

-pub async fn clip(
-    args: CommandArgs,
-    _registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
+pub async fn clip(args: CommandArgs) -> Result<OutputStream, ShellError> {
    let input = args.input;
    let name = args.call_info.name_tag.clone();
    let values: Vec<Value> = input.collect().await;

-    if let Ok(clip_context) = ClipboardProvider::new() {
-        let mut clip_context: ClipboardContext = clip_context;
+    if let Ok(mut clip_context) = Clipboard::new() {
        let mut new_copy_data = String::new();

        if !values.is_empty() {
@ -81,7 +72,7 @@ pub async fn clip(
            }
        }

-        match clip_context.set_contents(new_copy_data) {
+        match clip_context.set_text(new_copy_data) {
            Ok(_) => {}
            Err(_) => {
                return Err(ShellError::labeled_error(
@ -110,6 +101,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Clip {})?)
+        test_examples(Clip {})
    }
 }
--- a/crates/nu-command/src/commands/command.rs
+++ b/crates/nu-command/src/commands/command.rs
@ -0,0 +1,21 @@
+use crate::prelude::*;
+use nu_engine::Command;
+use nu_errors::ShellError;
+use parking_lot::Mutex;
+use std::sync::atomic::AtomicBool;
+
+pub struct RunnableContext {
+    pub input: InputStream,
+    pub shell_manager: ShellManager,
+    pub host: Arc<parking_lot::Mutex<Box<dyn Host>>>,
+    pub ctrl_c: Arc<AtomicBool>,
+    pub current_errors: Arc<Mutex<Vec<ShellError>>>,
+    pub scope: Scope,
+    pub name: Tag,
+}
+
+impl RunnableContext {
+    pub fn get_command(&self, name: &str) -> Option<Command> {
+        self.scope.get_command(name)
+    }
+}
--- a/crates/nu-command/src/commands/compact.rs
+++ b/crates/nu-command/src/commands/compact.rs
@ -1,8 +1,7 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
 use futures::future;
 use futures::stream::StreamExt;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
 use nu_source::Tagged;
@ -28,12 +27,8 @@ impl WholeStreamCommand for Compact {
        "Creates a table with non-empty rows"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        compact(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        compact(args).await
    }

    fn examples(&self) -> Vec<Example> {
@ -45,12 +40,8 @@ impl WholeStreamCommand for Compact {
    }
 }

-pub async fn compact(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-    let (CompactArgs { rest: columns }, input) = args.process(&registry).await?;
+pub async fn compact(args: CommandArgs) -> Result<OutputStream, ShellError> {
+    let (CompactArgs { rest: columns }, input) = args.process().await?;
    Ok(input
        .filter_map(move |item| {
            future::ready(if columns.is_empty() {
@ -90,6 +81,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Compact {})?)
+        test_examples(Compact {})
    }
 }
--- a/crates/nu-command/src/commands/config/clear.rs
+++ b/crates/nu-command/src/commands/config/clear.rs
@ -1,6 +1,5 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, UntaggedValue};

@ -20,12 +19,8 @@ impl WholeStreamCommand for SubCommand {
        "clear the config"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        clear(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        clear(args).await
    }

    fn examples(&self) -> Vec<Example> {
@ -37,10 +32,7 @@ impl WholeStreamCommand for SubCommand {
    }
 }

-pub async fn clear(
-    args: CommandArgs,
-    _registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
+pub async fn clear(args: CommandArgs) -> Result<OutputStream, ShellError> {
    let name_span = args.call_info.name_tag.clone();

    // NOTE: None because we are not loading a new config file, we just want to read from the
--- a/crates/nu-command/src/commands/config/command.rs
+++ b/crates/nu-command/src/commands/config/command.rs
@ -1,8 +1,9 @@
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
-use crate::{CommandArgs, CommandRegistry, OutputStream};
+use nu_engine::CommandArgs;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, UntaggedValue};
+use nu_stream::OutputStream;

 pub struct Command;

@ -20,11 +21,7 @@ impl WholeStreamCommand for Command {
        "Configuration management."
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        _registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        let name_span = args.call_info.name_tag.clone();
        let name = args.call_info.name_tag;
        let result = nu_data::config::read(name_span, &None)?;
--- a/crates/nu-command/src/commands/config/get.rs
+++ b/crates/nu-command/src/commands/config/get.rs
@ -1,6 +1,5 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ColumnPath, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};

@ -29,12 +28,8 @@ impl WholeStreamCommand for SubCommand {
        "Gets a value from the config"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        get(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        get(args).await
    }

    fn examples(&self) -> Vec<Example> {
@ -46,12 +41,9 @@ impl WholeStreamCommand for SubCommand {
    }
 }

-pub async fn get(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
+pub async fn get(args: CommandArgs) -> Result<OutputStream, ShellError> {
    let name_tag = args.call_info.name_tag.clone();
-    let (GetArgs { path }, _) = args.process(&registry).await?;
+    let (GetArgs { path }, _) = args.process().await?;

    // NOTE: None because we are not loading a new config file, we just want to read from the
    // existing config
--- a/crates/nu-command/src/commands/config/load.rs
+++ b/crates/nu-command/src/commands/config/load.rs
@ -1,6 +1,5 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue};
 use nu_source::Tagged;
@ -22,7 +21,7 @@ impl WholeStreamCommand for SubCommand {
    fn signature(&self) -> Signature {
        Signature::build("config load").required(
            "load",
-            SyntaxShape::Path,
+            SyntaxShape::FilePath,
            "Path to load the config from",
        )
    }
@ -31,22 +30,15 @@ impl WholeStreamCommand for SubCommand {
        "Loads the config from the path given"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        set(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        set(args).await
    }
 }

-pub async fn set(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
+pub async fn set(args: CommandArgs) -> Result<OutputStream, ShellError> {
    let name = args.call_info.name_tag.clone();
    let name_span = args.call_info.name_tag.clone();
-    let (LoadArgs { load }, _) = args.process(&registry).await?;
+    let (LoadArgs { load }, _) = args.process().await?;

    let configuration = load.item().clone();

--- a/crates/nu-command/src/commands/config/mod.rs
+++ b/crates/nu-command/src/commands/config/mod.rs
--- a/crates/nu-command/src/commands/config/path.rs
+++ b/crates/nu-command/src/commands/config/path.rs
@ -1,6 +1,5 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{Primitive, ReturnSuccess, Signature, UntaggedValue};

@ -20,12 +19,8 @@ impl WholeStreamCommand for SubCommand {
        "return the path to the config file"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        path(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        path(args).await
    }

    fn examples(&self) -> Vec<Example> {
@ -37,13 +32,10 @@ impl WholeStreamCommand for SubCommand {
    }
 }

-pub async fn path(
-    args: CommandArgs,
-    _registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
+pub async fn path(args: CommandArgs) -> Result<OutputStream, ShellError> {
    let path = config::default_path()?;

    Ok(OutputStream::one(ReturnSuccess::value(
-        UntaggedValue::Primitive(Primitive::Path(path)).into_value(args.call_info.name_tag),
+        UntaggedValue::Primitive(Primitive::FilePath(path)).into_value(args.call_info.name_tag),
    )))
 }
--- a/crates/nu-command/src/commands/config/remove.rs
+++ b/crates/nu-command/src/commands/config/remove.rs
@ -1,6 +1,5 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue};
 use nu_source::Tagged;
@ -30,12 +29,8 @@ impl WholeStreamCommand for SubCommand {
        "Removes a value from the config"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        remove(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        remove(args).await
    }

    fn examples(&self) -> Vec<Example> {
@ -47,12 +42,9 @@ impl WholeStreamCommand for SubCommand {
    }
 }

-pub async fn remove(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
+pub async fn remove(args: CommandArgs) -> Result<OutputStream, ShellError> {
    let name_span = args.call_info.name_tag.clone();
-    let (RemoveArgs { remove }, _) = args.process(&registry).await?;
+    let (RemoveArgs { remove }, _) = args.process().await?;

    let mut result = nu_data::config::read(name_span, &None)?;

--- a/crates/nu-command/src/commands/config/set.rs
+++ b/crates/nu-command/src/commands/config/set.rs
@ -1,6 +1,5 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ColumnPath, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};

@ -28,12 +27,8 @@ impl WholeStreamCommand for SubCommand {
        "Sets a value in the config"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        set(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        set(args).await
    }

    fn examples(&self) -> Vec<Example> {
@ -62,12 +57,9 @@ impl WholeStreamCommand for SubCommand {
    }
 }

-pub async fn set(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
+pub async fn set(args: CommandArgs) -> Result<OutputStream, ShellError> {
    let name_tag = args.call_info.name_tag.clone();
-    let (SetArgs { path, mut value }, _) = args.process(&registry).await?;
+    let (SetArgs { path, mut value }, _) = args.process().await?;

    // NOTE: None because we are not loading a new config file, we just want to read from the
    // existing config
--- a/crates/nu-command/src/commands/config/set_into.rs
+++ b/crates/nu-command/src/commands/config/set_into.rs
@ -1,6 +1,5 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
 use nu_source::Tagged;
@ -30,12 +29,8 @@ impl WholeStreamCommand for SubCommand {
        "Sets a value in the config"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        set_into(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        set_into(args).await
    }

    fn examples(&self) -> Vec<Example> {
@ -47,14 +42,11 @@ impl WholeStreamCommand for SubCommand {
    }
 }

-pub async fn set_into(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
+pub async fn set_into(args: CommandArgs) -> Result<OutputStream, ShellError> {
    let name_span = args.call_info.name_tag.clone();
    let name = args.call_info.name_tag.clone();

-    let (SetIntoArgs { set_into: v }, input) = args.process(&registry).await?;
+    let (SetIntoArgs { set_into: v }, input) = args.process().await?;

    // NOTE: None because we are not loading a new config file, we just want to read from the
    // existing config
--- a/crates/nu-command/src/commands/constants.rs
+++ b/crates/nu-command/src/commands/constants.rs
--- a/crates/nu-command/src/commands/count.rs
+++ b/crates/nu-command/src/commands/count.rs
@ -1,7 +1,6 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
 use futures::stream::StreamExt;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{Signature, UntaggedValue, Value};

@ -30,13 +29,9 @@ impl WholeStreamCommand for Count {
        "Show the total number of rows or items."
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        let tag = args.call_info.name_tag.clone();
-        let (CountArgs { column }, input) = args.process(&registry).await?;
+        let (CountArgs { column }, input) = args.process().await?;
        let rows: Vec<Value> = input.collect().await;

        let count = if column {
@ -86,6 +81,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Count {})?)
+        test_examples(Count {})
    }
 }
--- a/crates/nu-command/src/commands/cp.rs
+++ b/crates/nu-command/src/commands/cp.rs
@ -1,20 +1,10 @@
-use crate::command_registry::CommandRegistry;
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{Signature, SyntaxShape};
-use nu_source::Tagged;
-use std::path::PathBuf;

 pub struct Cpy;

-#[derive(Deserialize)]
-pub struct CopyArgs {
-    pub src: Tagged<PathBuf>,
-    pub dst: Tagged<PathBuf>,
-    pub recursive: Tagged<bool>,
-}
-
 #[async_trait]
 impl WholeStreamCommand for Cpy {
    fn name(&self) -> &str {
@ -23,8 +13,8 @@ impl WholeStreamCommand for Cpy {

    fn signature(&self) -> Signature {
        Signature::build("cp")
-            .required("src", SyntaxShape::Pattern, "the place to copy from")
-            .required("dst", SyntaxShape::Path, "the place to copy to")
+            .required("src", SyntaxShape::GlobPattern, "the place to copy from")
+            .required("dst", SyntaxShape::FilePath, "the place to copy to")
            .switch(
                "recursive",
                "copy recursively through subdirectories",
@ -36,14 +26,10 @@ impl WholeStreamCommand for Cpy {
        "Copy files."
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        let shell_manager = args.shell_manager.clone();
        let name = args.call_info.name_tag.clone();
-        let (args, _) = args.process(&registry).await?;
+        let (args, _) = args.process().await?;
        shell_manager.cp(args, name)
    }

@ -72,6 +58,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Cpy {})?)
+        test_examples(Cpy {})
    }
 }
--- a/crates/nu-command/src/commands/date/command.rs
+++ b/crates/nu-command/src/commands/date/command.rs
@ -1,5 +1,5 @@
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, UntaggedValue};

@ -19,16 +19,9 @@ impl WholeStreamCommand for Command {
        "Apply date function"
    }

-    async fn run(
-        &self,
-        _args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        let registry = registry.clone();
-
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
        Ok(OutputStream::one(ReturnSuccess::value(
-            UntaggedValue::string(crate::commands::help::get_help(&Command, &registry))
-                .into_value(Tag::unknown()),
+            UntaggedValue::string(get_help(&Command, &args.scope)).into_value(Tag::unknown()),
        )))
    }
 }
@ -42,6 +35,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Command {})?)
+        test_examples(Command {})
    }
 }
--- a/crates/nu-command/src/commands/date/format.rs
+++ b/crates/nu-command/src/commands/date/format.rs
@ -0,0 +1,109 @@
+use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
+use nu_errors::ShellError;
+use nu_protocol::{
+    Dictionary, Primitive, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value,
+};
+use nu_source::Tagged;
+use std::fmt::{self, write};
+
+pub struct Date;
+
+#[derive(Deserialize)]
+pub struct FormatArgs {
+    format: Tagged<String>,
+    table: bool,
+}
+
+#[async_trait]
+impl WholeStreamCommand for Date {
+    fn name(&self) -> &str {
+        "date format"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("date format")
+            .required("format", SyntaxShape::String, "strftime format")
+            .switch("table", "print date in a table", Some('t'))
+    }
+
+    fn usage(&self) -> &str {
+        "Format a given date using the given format string."
+    }
+
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        format(args).await
+    }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![
+            Example {
+                description: "Format the current date",
+                example: "date now | date format '%Y.%m.%d_%H %M %S,%z'",
+                result: None,
+            },
+            Example {
+                description: "Format the current date and print in a table",
+                example: "date now | date format -t '%Y-%m-%d_%H:%M:%S %z'",
+                result: None,
+            },
+        ]
+    }
+}
+
+pub async fn format(args: CommandArgs) -> Result<OutputStream, ShellError> {
+    let tag = args.call_info.name_tag.clone();
+    let (FormatArgs { format, table }, input) = args.process().await?;
+
+    Ok(input
+        .map(move |value| match value {
+            Value {
+                value: UntaggedValue::Primitive(Primitive::Date(dt)),
+                ..
+            } => {
+                let mut output = String::new();
+                if let Err(fmt::Error) =
+                    write(&mut output, format_args!("{}", dt.format(&format.item)))
+                {
+                    Err(ShellError::labeled_error(
+                        "The date format is invalid",
+                        "invalid strftime format",
+                        &format.tag,
+                    ))
+                } else {
+                    let value = if table {
+                        let mut indexmap = IndexMap::new();
+                        indexmap.insert(
+                            "formatted".to_string(),
+                            UntaggedValue::string(&output).into_value(&tag),
+                        );
+
+                        UntaggedValue::Row(Dictionary::from(indexmap)).into_value(&tag)
+                    } else {
+                        UntaggedValue::string(&output).into_value(&tag)
+                    };
+
+                    ReturnSuccess::value(value)
+                }
+            }
+            _ => Err(ShellError::labeled_error(
+                "Expected a date from pipeline",
+                "requires date input",
+                &tag,
+            )),
+        })
+        .to_output_stream())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Date;
+    use super::ShellError;
+
+    #[test]
+    fn examples_work_as_expected() -> Result<(), ShellError> {
+        use crate::examples::test as test_examples;
+
+        test_examples(Date {})
+    }
+}
--- a/crates/nu-command/src/commands/date/list_timezone.rs
+++ b/crates/nu-command/src/commands/date/list_timezone.rs
@ -0,0 +1,75 @@
+use crate::prelude::*;
+use chrono_tz::TZ_VARIANTS;
+use indexmap::IndexMap;
+use nu_engine::WholeStreamCommand;
+use nu_errors::ShellError;
+use nu_protocol::{Dictionary, ReturnSuccess, Signature, UntaggedValue};
+
+pub struct Date;
+
+#[async_trait]
+impl WholeStreamCommand for Date {
+    fn name(&self) -> &str {
+        "date list-timezone"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("date list-timezone")
+    }
+
+    fn usage(&self) -> &str {
+        "List supported time zones."
+    }
+
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        list_timezone(args).await
+    }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![
+            Example {
+                description: "List all supported time zones",
+                example: "date list-timezone",
+                result: None,
+            },
+            Example {
+                description: "List all supported European time zones",
+                example: "date list-timezone | where timezone =~ Europe",
+                result: None,
+            },
+        ]
+    }
+}
+
+async fn list_timezone(args: CommandArgs) -> Result<OutputStream, ShellError> {
+    let args = args.evaluate_once().await?;
+    let tag = args.call_info.name_tag.clone();
+
+    let list = TZ_VARIANTS.iter().map(move |tz| {
+        let mut entries = IndexMap::new();
+
+        entries.insert(
+            "timezone".to_string(),
+            UntaggedValue::string(tz.name()).into_value(&tag),
+        );
+
+        Ok(ReturnSuccess::Value(
+            UntaggedValue::Row(Dictionary { entries }).into_value(&tag),
+        ))
+    });
+
+    Ok(futures::stream::iter(list).to_output_stream())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Date;
+    use super::ShellError;
+
+    #[test]
+    fn examples_work_as_expected() -> Result<(), ShellError> {
+        use crate::examples::test as test_examples;
+
+        test_examples(Date {})
+    }
+}
--- a/crates/nu-command/src/commands/date/mod.rs
+++ b/crates/nu-command/src/commands/date/mod.rs
@ -0,0 +1,15 @@
+pub mod command;
+pub mod format;
+pub mod list_timezone;
+pub mod now;
+pub mod to_table;
+pub mod to_timezone;
+
+mod parser;
+
+pub use command::Command as Date;
+pub use format::Date as DateFormat;
+pub use list_timezone::Date as DateListTimeZone;
+pub use now::Date as DateNow;
+pub use to_table::Date as DateToTable;
+pub use to_timezone::Date as DateToTimeZone;
--- a/crates/nu-command/src/commands/date/now.rs
+++ b/crates/nu-command/src/commands/date/now.rs
@ -0,0 +1,50 @@
+use crate::prelude::*;
+use chrono::{DateTime, Local};
+use nu_engine::WholeStreamCommand;
+use nu_errors::ShellError;
+use nu_protocol::{Signature, UntaggedValue};
+
+pub struct Date;
+
+#[async_trait]
+impl WholeStreamCommand for Date {
+    fn name(&self) -> &str {
+        "date now"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("date now")
+    }
+
+    fn usage(&self) -> &str {
+        "Get the current date."
+    }
+
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        now(args).await
+    }
+}
+
+pub async fn now(args: CommandArgs) -> Result<OutputStream, ShellError> {
+    let args = args.evaluate_once().await?;
+    let tag = args.call_info.name_tag.clone();
+
+    let now: DateTime<Local> = Local::now();
+
+    let value = UntaggedValue::date(now.with_timezone(now.offset())).into_value(&tag);
+
+    Ok(OutputStream::one(value))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Date;
+    use super::ShellError;
+
+    #[test]
+    fn examples_work_as_expected() -> Result<(), ShellError> {
+        use crate::examples::test as test_examples;
+
+        test_examples(Date {})
+    }
+}
--- a/crates/nu-command/src/commands/date/parser.rs
+++ b/crates/nu-command/src/commands/date/parser.rs
@ -0,0 +1,107 @@
+// Modified from chrono::format::scan
+
+use chrono::{DateTime, FixedOffset, Local, Offset, TimeZone};
+use chrono_tz::Tz;
+use titlecase::titlecase;
+
+#[derive(Debug, Clone, PartialEq, Eq, Copy)]
+pub enum ParseErrorKind {
+    /// Given field is out of permitted range.
+    OutOfRange,
+
+    /// The input string has some invalid character sequence for given formatting items.
+    Invalid,
+
+    /// The input string has been prematurely ended.
+    TooShort,
+}
+
+pub fn datetime_in_timezone(
+    dt: &DateTime<FixedOffset>,
+    s: &str,
+) -> Result<DateTime<FixedOffset>, ParseErrorKind> {
+    match timezone_offset_internal(s, true, true) {
+        Ok(offset) => match FixedOffset::east_opt(offset) {
+            Some(offset) => Ok(dt.with_timezone(&offset)),
+            None => Err(ParseErrorKind::OutOfRange),
+        },
+        Err(ParseErrorKind::Invalid) => {
+            if s.to_lowercase() == "local" {
+                Ok(dt.with_timezone(Local::now().offset()))
+            } else {
+                let tz: Tz = parse_timezone_internal(s)?;
+                let offset = tz.offset_from_utc_datetime(&dt.naive_utc()).fix();
+                Ok(dt.with_timezone(&offset))
+            }
+        }
+        Err(e) => Err(e),
+    }
+}
+
+fn parse_timezone_internal(s: &str) -> Result<Tz, ParseErrorKind> {
+    if let Ok(tz) = s.parse() {
+        Ok(tz)
+    } else if let Ok(tz) = titlecase(s).parse() {
+        Ok(tz)
+    } else if let Ok(tz) = s.to_uppercase().parse() {
+        Ok(tz)
+    } else {
+        Err(ParseErrorKind::Invalid)
+    }
+}
+
+fn timezone_offset_internal(
+    mut s: &str,
+    consume_colon: bool,
+    allow_missing_minutes: bool,
+) -> Result<i32, ParseErrorKind> {
+    fn digits(s: &str) -> Result<(u8, u8), ParseErrorKind> {
+        let b = s.as_bytes();
+        if b.len() < 2 {
+            Err(ParseErrorKind::TooShort)
+        } else {
+            Ok((b[0], b[1]))
+        }
+    }
+    let negative = match s.as_bytes().first() {
+        Some(&b'+') => false,
+        Some(&b'-') => true,
+        Some(_) => return Err(ParseErrorKind::Invalid),
+        None => return Err(ParseErrorKind::TooShort),
+    };
+    s = &s[1..];
+
+    // hours (00--99)
+    let hours = match digits(s)? {
+        (h1 @ b'0'..=b'9', h2 @ b'0'..=b'9') => i32::from((h1 - b'0') * 10 + (h2 - b'0')),
+        _ => return Err(ParseErrorKind::Invalid),
+    };
+    s = &s[2..];
+
+    // colons (and possibly other separators)
+    if consume_colon {
+        s = s.trim_start_matches(|c: char| c == ':' || c.is_whitespace());
+    }
+
+    // minutes (00--59)
+    // if the next two items are digits then we have to add minutes
+    let minutes = if let Ok(ds) = digits(s) {
+        match ds {
+            (m1 @ b'0'..=b'5', m2 @ b'0'..=b'9') => i32::from((m1 - b'0') * 10 + (m2 - b'0')),
+            (b'6'..=b'9', b'0'..=b'9') => return Err(ParseErrorKind::OutOfRange),
+            _ => return Err(ParseErrorKind::Invalid),
+        }
+    } else if allow_missing_minutes {
+        0
+    } else {
+        return Err(ParseErrorKind::TooShort);
+    };
+    match s.len() {
+        len if len >= 2 => &s[2..],
+        len if len == 0 => s,
+        _ => return Err(ParseErrorKind::TooShort),
+    };
+
+    let seconds = hours * 3600 + minutes * 60;
+    Ok(if negative { -seconds } else { seconds })
+}
--- a/crates/nu-command/src/commands/date/to_table.rs
+++ b/crates/nu-command/src/commands/date/to_table.rs
@ -0,0 +1,105 @@
+use crate::prelude::*;
+use chrono::{Datelike, Timelike};
+use indexmap::IndexMap;
+use nu_engine::WholeStreamCommand;
+use nu_errors::ShellError;
+use nu_protocol::{Dictionary, Primitive, ReturnSuccess, Signature, UntaggedValue, Value};
+
+pub struct Date;
+
+#[async_trait]
+impl WholeStreamCommand for Date {
+    fn name(&self) -> &str {
+        "date to-table"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("date to-table")
+    }
+
+    fn usage(&self) -> &str {
+        "Print the date in a structured table."
+    }
+
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        to_table(args).await
+    }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![Example {
+            description: "Print the current date in a table",
+            example: "date now | date to-table",
+            result: None,
+        }]
+    }
+}
+
+async fn to_table(args: CommandArgs) -> Result<OutputStream, ShellError> {
+    let args = args.evaluate_once().await?;
+    let tag = args.call_info.name_tag.clone();
+    let input = args.input;
+
+    Ok(input
+        .map(move |value| match value {
+            Value {
+                value: UntaggedValue::Primitive(Primitive::Date(dt)),
+                ..
+            } => {
+                let mut indexmap = IndexMap::new();
+
+                indexmap.insert(
+                    "year".to_string(),
+                    UntaggedValue::int(dt.year()).into_value(&tag),
+                );
+                indexmap.insert(
+                    "month".to_string(),
+                    UntaggedValue::int(dt.month()).into_value(&tag),
+                );
+                indexmap.insert(
+                    "day".to_string(),
+                    UntaggedValue::int(dt.day()).into_value(&tag),
+                );
+                indexmap.insert(
+                    "hour".to_string(),
+                    UntaggedValue::int(dt.hour()).into_value(&tag),
+                );
+                indexmap.insert(
+                    "minute".to_string(),
+                    UntaggedValue::int(dt.minute()).into_value(&tag),
+                );
+                indexmap.insert(
+                    "second".to_string(),
+                    UntaggedValue::int(dt.second()).into_value(&tag),
+                );
+
+                let tz = dt.offset();
+                indexmap.insert(
+                    "timezone".to_string(),
+                    UntaggedValue::string(format!("{}", tz)).into_value(&tag),
+                );
+
+                let value = UntaggedValue::Row(Dictionary::from(indexmap)).into_value(&tag);
+
+                ReturnSuccess::value(value)
+            }
+            _ => Err(ShellError::labeled_error(
+                "Expected a date from pipeline",
+                "requires date input",
+                &tag,
+            )),
+        })
+        .to_output_stream())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Date;
+    use super::ShellError;
+
+    #[test]
+    fn examples_work_as_expected() -> Result<(), ShellError> {
+        use crate::examples::test as test_examples;
+
+        test_examples(Date {})
+    }
+}
--- a/crates/nu-command/src/commands/date/to_timezone.rs
+++ b/crates/nu-command/src/commands/date/to_timezone.rs
@ -0,0 +1,110 @@
+use crate::commands::date::parser::{datetime_in_timezone, ParseErrorKind};
+use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
+use nu_errors::ShellError;
+use nu_protocol::{Primitive, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
+use nu_source::Tagged;
+
+pub struct Date;
+
+#[derive(Deserialize)]
+struct DateToTimeZoneArgs {
+    timezone: Tagged<String>,
+}
+
+#[async_trait]
+impl WholeStreamCommand for Date {
+    fn name(&self) -> &str {
+        "date to-timezone"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("date to-timezone").required(
+            "time zone",
+            SyntaxShape::String,
+            "time zone description",
+        )
+    }
+
+    fn usage(&self) -> &str {
+        "Convert a date to a given time zone.
+        
+Use `date list-timezone` to list all supported time zones.
+        "
+    }
+
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        to_timezone(args).await
+    }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![
+            Example {
+                description: "Get the current date in UTC+05:00",
+                example: "date now | date to-timezone +0500",
+                result: None,
+            },
+            Example {
+                description: "Get the current local date",
+                example: "date now | date to-timezone local",
+                result: None,
+            },
+            Example {
+                description: "Get the current date in Hawaii",
+                example: "date now | date to-timezone US/Hawaii",
+                result: None,
+            },
+        ]
+    }
+}
+
+async fn to_timezone(args: CommandArgs) -> Result<OutputStream, ShellError> {
+    let tag = args.call_info.name_tag.clone();
+    let (DateToTimeZoneArgs { timezone }, input) = args.process().await?;
+
+    Ok(input
+        .map(move |value| match value {
+            Value {
+                value: UntaggedValue::Primitive(Primitive::Date(dt)),
+                ..
+            } => match datetime_in_timezone(&dt, &timezone.item) {
+                Ok(dt) => {
+                    let value = UntaggedValue::date(dt).into_value(&tag);
+
+                    ReturnSuccess::value(value)
+                }
+                Err(e) => Err(ShellError::labeled_error(
+                    error_message(e),
+                    "invalid time zone",
+                    &timezone.tag,
+                )),
+            },
+            _ => Err(ShellError::labeled_error(
+                "Expected a date from pipeline",
+                "requires date input",
+                &tag,
+            )),
+        })
+        .to_output_stream())
+}
+
+fn error_message(err: ParseErrorKind) -> &'static str {
+    match err {
+        ParseErrorKind::Invalid => "The time zone description is invalid",
+        ParseErrorKind::OutOfRange => "The time zone offset is out of range",
+        ParseErrorKind::TooShort => "The format of the time zone is invalid",
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Date;
+    use super::ShellError;
+
+    #[test]
+    fn examples_work_as_expected() -> Result<(), ShellError> {
+        use crate::examples::test as test_examples;
+
+        test_examples(Date {})
+    }
+}
--- a/crates/nu-command/src/commands/date/utc.rs
+++ b/crates/nu-command/src/commands/date/utc.rs
@ -3,7 +3,7 @@ use chrono::{DateTime, Utc};
 use nu_errors::ShellError;

 use crate::commands::date::utils::date_to_value;
-use crate::commands::WholeStreamCommand;
+use nu_engine::WholeStreamCommand;
 use nu_protocol::Signature;

 pub struct Date;
@ -22,21 +22,13 @@ impl WholeStreamCommand for Date {
        "return the current date in utc."
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        utc(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        utc(args).await
    }
 }

-pub async fn utc(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-    let args = args.evaluate_once(&registry).await?;
+pub async fn utc(args: CommandArgs) -> Result<OutputStream, ShellError> {
+    let args = args.evaluate_once().await?;
    let tag = args.call_info.name_tag.clone();

    let no_fmt = "".to_string();
@ -58,6 +50,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Date {})?)
+        test_examples(Date {})
    }
 }
--- a/crates/nu-command/src/commands/debug.rs
+++ b/crates/nu-command/src/commands/debug.rs
@ -1,5 +1,5 @@
-use crate::commands::WholeStreamCommand;
 use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
 use nu_errors::ShellError;
 use nu_protocol::{ReturnSuccess, Signature, UntaggedValue};

@ -24,21 +24,13 @@ impl WholeStreamCommand for Debug {
        "Print the Rust debug representation of the values"
    }

-    async fn run(
-        &self,
-        args: CommandArgs,
-        registry: &CommandRegistry,
-    ) -> Result<OutputStream, ShellError> {
-        debug_value(args, registry).await
+    async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
+        debug_value(args).await
    }
 }

-async fn debug_value(
-    args: CommandArgs,
-    registry: &CommandRegistry,
-) -> Result<OutputStream, ShellError> {
-    let registry = registry.clone();
-    let (DebugArgs { raw }, input) = args.process(&registry).await?;
+async fn debug_value(args: CommandArgs) -> Result<OutputStream, ShellError> {
+    let (DebugArgs { raw }, input) = args.process().await?;
    Ok(input
        .map(move |v| {
            if raw {
@ -61,6 +53,6 @@ mod tests {
    fn examples_work_as_expected() -> Result<(), ShellError> {
        use crate::examples::test as test_examples;

-        Ok(test_examples(Debug {})?)
+        test_examples(Debug {})
    }
 }
--- a/crates/nu-command/src/commands/def.rs
+++ b/crates/nu-command/src/commands/def.rs
@ -0,0 +1,48 @@
+use crate::prelude::*;
+use nu_engine::WholeStreamCommand;
+
+use nu_errors::ShellError;
+use nu_protocol::{hir::CapturedBlock, Signature, SyntaxShape, Value};
+use nu_source::Tagged;
+
+pub struct Def;
+
+#[derive(Deserialize)]
+pub struct DefArgs {
+    pub name: Tagged<String>,
+    pub args: Tagged<Vec<Value>>,
+    pub block: CapturedBlock,
+}
+
+#[async_trait]
+impl WholeStreamCommand for Def {
+    fn name(&self) -> &str {
+        "def"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("def")
+            .required("name", SyntaxShape::String, "the name of the command")
+            .required(
+                "params",
+                SyntaxShape::Table,
+                "the parameters of the command",
+            )
+            .required("block", SyntaxShape::Block, "the body of the command")
+    }
+
+    fn usage(&self) -> &str {
+        "Create a command and set it to a definition."
+    }
+
+    async fn run(&self, _args: CommandArgs) -> Result<OutputStream, ShellError> {
+        // Currently, we don't do anything here because we should have already
+        // installed the definition as we entered the scope
+        // We just create a command so that we can get proper coloring
+        Ok(OutputStream::empty())
+    }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![]
+    }
+}
--- a/Show More
+++ b/Show More