nushell/crates
JT 4af24363c2
remove let-env, focus on mutating $env (#9574)
# Description

For years, Nushell has used `let-env` to set a single environment
variable. As our work on scoping continued, we refined what it meant for
a variable to be in scope using `let` but never updated how `let-env`
would work. Instead, `let-env` confusingly created mutations to the
command's copy of `$env`.

So, to help fix the mental model and point people to the right way of
thinking about what changing the environment means, this PR removes
`let-env` to encourage people to think of it as updating the command's
environment variable via mutation.

Before:

```
let-env FOO = "BAR"
```

Now:

```
$env.FOO = "BAR"
```

It's also a good reminder that the environment owned by the command is
in the `$env` variable rather than global like it is in other shells.

# User-Facing Changes

BREAKING CHANGE BREAKING CHANGE

This completely removes `let-env FOO = "BAR"` so that we can focus on
`$env.FOO = "BAR"`.

# Tests + Formatting
<!--
Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect -A clippy::result_large_err` to check that
you're using the standard code style
- `cargo test --workspace` to check that all tests pass
- `cargo run -- crates/nu-std/tests/run.nu` to run the tests for the
standard library

> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->

# After / Before Submitting
integration scripts to update:
- ✔️
[starship](https://github.com/starship/starship/blob/master/src/init/starship.nu)
- ✔️
[virtualenv](https://github.com/pypa/virtualenv/blob/main/src/virtualenv/activation/nushell/activate.nu)
- ✔️
[atuin](https://github.com/ellie/atuin/blob/main/atuin/src/shell/atuin.nu)
(PR: https://github.com/ellie/atuin/pull/1080)
- 
[zoxide](https://github.com/ajeetdsouza/zoxide/blob/main/templates/nushell.txt)
(PR: https://github.com/ajeetdsouza/zoxide/pull/587)
- ✔️
[oh-my-posh](https://github.com/JanDeDobbeleer/oh-my-posh/blob/main/src/shell/scripts/omp.nu)
(pr: https://github.com/JanDeDobbeleer/oh-my-posh/pull/4011)
2023-07-01 07:57:51 +12:00
..
nu_plugin_custom_values Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu_plugin_example Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu_plugin_formats Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu_plugin_gstat Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu_plugin_inc Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu_plugin_python update nu_plugin_python due to signature changes (#8107) 2023-02-18 13:27:24 +00:00
nu_plugin_query Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-cli Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-cmd-base Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-cmd-dataframe Improve type hovers (#9515) 2023-06-29 05:19:48 +12:00
nu-cmd-extra convert a string to a raw binary string of 0s and 1s (#9534) 2023-06-28 13:04:07 -05:00
nu-cmd-lang remove let-env, focus on mutating $env (#9574) 2023-07-01 07:57:51 +12:00
nu-color-config remove let-env, focus on mutating $env (#9574) 2023-07-01 07:57:51 +12:00
nu-command remove let-env, focus on mutating $env (#9574) 2023-07-01 07:57:51 +12:00
nu-engine remove let-env, focus on mutating $env (#9574) 2023-07-01 07:57:51 +12:00
nu-explore Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-glob Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-json Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-parser remove let-env, focus on mutating $env (#9574) 2023-07-01 07:57:51 +12:00
nu-path Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-plugin Improve type hovers (#9515) 2023-06-29 05:19:48 +12:00
nu-pretty-hex Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-protocol remove let-env, focus on mutating $env (#9574) 2023-07-01 07:57:51 +12:00
nu-std remove let-env, focus on mutating $env (#9574) 2023-07-01 07:57:51 +12:00
nu-system Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-table Fix #9548 (#9552) 2023-06-28 17:52:04 -05:00
nu-term-grid Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-test-support Bump to 0.82.1 dev version (#9543) 2023-06-27 21:33:53 +02:00
nu-utils remove let-env, focus on mutating $env (#9574) 2023-07-01 07:57:51 +12:00
README.md Remove old nushell/merge engine-q 2022-02-07 14:54:06 -05:00

Nushell core libraries and plugins

These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.

Foundational libraries are split into two kinds of crates:

  • Core crates - those crates that work together to build the Nushell language engine
  • Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.

Plugins are likewise also split into two types:

  • Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
  • Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.