nushell/crates/nu-engine/Cargo.toml

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[package]
authors = ["The Nushell Project Developers"]
description = "Nushell's evaluation engine"
repository = "https://github.com/nushell/nushell/tree/main/crates/nu-engine"
edition = "2021"
license = "MIT"
name = "nu-engine"
version = "0.76.1"
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[lib]
bench = false
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[dependencies]
nu-protocol = { path = "../nu-protocol", features = ["plugin"], version = "0.76.1" }
nu-path = { path = "../nu-path", version = "0.76.1" }
nu-glob = { path = "../nu-glob", version = "0.76.1" }
nu-utils = { path = "../nu-utils", version = "0.76.1" }
chore: chrono_update (#7132) chrono version update # Description upgrade chrono to 0.4.23 # Major Changes If you're considering making any major change to nushell, before starting work on it, seek feedback from regular contributors and get approval for the idea from the core team either on [Discord](https://discordapp.com/invite/NtAbbGn) or [GitHub issue](https://github.com/nushell/nushell/issues/new/choose). Making sure we're all on board with the change saves everybody's time. Thanks! # Tests + Formatting Make sure you've done the following, if applicable: - Add tests that cover your changes (either in the command examples, the crate/tests folder, or in the /tests folder) - Try to think about corner cases and various ways how your changes could break. Cover those in the tests 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 --features=extra -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect` to check that you're using the standard code style - `cargo test --workspace --features=extra` to check that all tests pass # After Submitting * Help us keep the docs up to date: If your PR affects the user experience of Nushell (adding/removing a command, changing an input/output type, etc.), make sure the changes are reflected in the documentation (https://github.com/nushell/nushell.github.io) after the PR is merged. Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>
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chrono = { version="0.4.23", features = ["std"], default-features = false }
LazyRecord (#7619) This is an attempt to implement a new `Value::LazyRecord` variant for performance reasons. `LazyRecord` is like a regular `Record`, but it's possible to access individual columns without evaluating other columns. I've implemented `LazyRecord` for the special `$nu` variable; accessing `$nu` is relatively slow because of all the information in `scope`, and [`$nu` accounts for about 2/3 of Nu's startup time on Linux](https://github.com/nushell/nushell/issues/6677#issuecomment-1364618122). ### Benchmarks I ran some benchmarks on my desktop (Linux, 12900K) and the results are very pleasing. Nu's time to start up and run a command (`cargo build --release; hyperfine 'target/release/nu -c "echo \"Hello, world!\""' --shell=none --warmup 10`) goes from **8.8ms to 3.2ms, about 2.8x faster**. Tests are also much faster! Running `cargo nextest` (with our very slow `proptest` tests disabled) goes from **7.2s to 4.4s (1.6x faster)**, because most tests involve launching a new instance of Nu. ### Design (updated) I've added a new `LazyRecord` trait and added a `Value` variant wrapping those trait objects, much like `CustomValue`. `LazyRecord` implementations must implement these 2 functions: ```rust // All column names fn column_names(&self) -> Vec<&'static str>; // Get 1 specific column value fn get_column_value(&self, column: &str) -> Result<Value, ShellError>; ``` ### Serializability `Value` variants must implement `Serializable` and `Deserializable`, which poses some problems because I want to use unserializable things like `EngineState` in `LazyRecord`s. To work around this, I basically lie to the type system: 1. Add `#[typetag::serde(tag = "type")]` to `LazyRecord` to make it serializable 2. Any unserializable fields in `LazyRecord` implementations get marked with `#[serde(skip)]` 3. At the point where a `LazyRecord` normally would get serialized and sent to a plugin, I instead collect it into a regular `Value::Record` (which can be serialized)
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serde = {version = "1.0.143", default-features = false }
sysinfo ="0.28.2"
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[features]
plugin = []