forked from extern/nushell
60da7abbc7
# Description Changes the `captures` field in `Closure` from a `HashMap` to a `Vec` and makes `Stack::captures_to_stack` take an owned `Vec` instead of a borrowed `HashMap`. This eliminates the conversion to a `Vec` inside `captures_to_stack` and makes it possible to avoid clones altogether when using an owned `Closure` (which is the case for most commands). Additionally, using a `Vec` reduces the size of `Value` by 8 bytes (down to 72). # User-Facing Changes Breaking API change for `nu-protocol`.
83 lines
2.2 KiB
Rust
83 lines
2.2 KiB
Rust
use nu_engine::{eval_block, redirect_env, CallExt};
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use nu_protocol::{
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ast::Call,
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engine::{Closure, Command, EngineState, Stack},
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Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
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};
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#[derive(Clone)]
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pub struct ExportEnv;
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impl Command for ExportEnv {
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fn name(&self) -> &str {
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"export-env"
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}
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fn signature(&self) -> Signature {
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Signature::build("export-env")
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.input_output_types(vec![(Type::Nothing, Type::Nothing)])
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.required(
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"block",
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SyntaxShape::Block,
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"the block to run to set the environment",
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)
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.category(Category::Env)
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}
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fn usage(&self) -> &str {
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"Run a block and preserve its environment in a current scope."
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}
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fn run(
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&self,
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engine_state: &EngineState,
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caller_stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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let capture_block: Closure = call.req(engine_state, caller_stack, 0)?;
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let block = engine_state.get_block(capture_block.block_id);
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let mut callee_stack = caller_stack.captures_to_stack(capture_block.captures);
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let _ = eval_block(
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engine_state,
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&mut callee_stack,
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block,
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input,
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call.redirect_stdout,
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call.redirect_stderr,
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);
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redirect_env(engine_state, caller_stack, &callee_stack);
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Ok(PipelineData::empty())
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Set an environment variable",
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example: r#"export-env { $env.SPAM = 'eggs' }"#,
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result: Some(Value::nothing(Span::test_data())),
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},
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Example {
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description: "Set an environment variable and examine its value",
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example: r#"export-env { $env.SPAM = 'eggs' }; $env.SPAM"#,
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result: Some(Value::test_string("eggs")),
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},
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]
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_examples() {
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use crate::test_examples;
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test_examples(ExportEnv {})
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}
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}
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