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# Description Closes: #7364 # User-Facing Changes Given the following shell script: ```bash x=$(printf '=%.0s' {1..100}) echo $x echo $x 1>&2 ``` It supports the following command: ``` bash test.sh out> out.txt err> err.txt ``` Then both `out.txt` and `err.txt` will contain `=`(100 times) ## About the change The core idea is that when doing lite-parsing, introduce a new variant `LiteElement::SeparateRedirection` if we meet two Redirection token(which is generated by `lex` function), During converting from lite block to block, `LiteElement::SeparateRedirection` will be converted to `PipelineElement::SeparateRedirection`. Then in the block eval process, if we get `PipelineElement::SeparateRedirection`, we invoke `save` command with `--stderr` arguments to acthive our behavior. ## What happened internally? Take the following command as example: ``` ^ls out> out.txt err> err.txt ``` lex parsing result(`Tokens`) are not changed, but `LiteBlock` and `Block` is changed after this pr. ### LiteBlock before ```rust LiteBlock { block: [ LitePipeline { commands: [ Command(None, LiteCommand { comments: [], parts: [Span { start: 39041, end: 39044 }] }), // actually the span of first Redirection is wrong too.. Redirection(Span { start: 39058, end: 39062 }, Stdout, LiteCommand { comments: [], parts: [Span { start: 39050, end: 39057 }] }), Redirection(Span { start: 39058, end: 39062 }, Stderr, LiteCommand { comments: [], parts: [Span { start: 39063, end: 39070 }] }) ] }] } ``` ### LiteBlock after ```rust LiteBlock { block: [ LitePipeline { commands: [ Command( None, LiteCommand { comments: [], parts: [Span { start: 38525, end: 38528 }] }), // new one! two Redirection merged into one SeparateRedirection. SeparateRedirection { out: (Span { start: 38529, end: 38533 }, LiteCommand { comments: [], parts: [Span { start: 38534, end: 38541 }] }), err: (Span { start: 38542, end: 38546 }, LiteCommand { comments: [], parts: [Span { start: 38547, end: 38554 }] }) } ] }] } ``` ### Block before ```rust Pipeline { elements: [ Expression(None, Expression { expr: ExternalCall(Expression { expr: String("ls"), span: Span { start: 39042, end: 39044 }, ty: String, custom_completion: None }, [], false), span: Span { start: 39041, end: 39044 }, ty: Any, custom_completion: None }), Redirection(Span { start: 39058, end: 39062 }, Stdout, Expression { expr: String("out.txt"), span: Span { start: 39050, end: 39057 }, ty: String, custom_completion: None }), Redirection(Span { start: 39058, end: 39062 }, Stderr, Expression { expr: String("err.txt"), span: Span { start: 39063, end: 39070 }, ty: String, custom_completion: None })] } ``` ### Block after ```rust Pipeline { elements: [ Expression(None, Expression { expr: ExternalCall(Expression { expr: String("ls"), span: Span { start: 38526, end: 38528 }, ty: String, custom_completion: None }, [], false), span: Span { start: 38525, end: 38528 }, ty: Any, custom_completion: None }), // new one! SeparateRedirection SeparateRedirection { out: (Span { start: 38529, end: 38533 }, Expression { expr: String("out.txt"), span: Span { start: 38534, end: 38541 }, ty: String, custom_completion: None }), err: (Span { start: 38542, end: 38546 }, Expression { expr: String("err.txt"), span: Span { start: 38547, end: 38554 }, ty: String, custom_completion: None }) } ] } ``` # 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` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass # After Submitting If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date.