eaec480f42
# Description This fix changes pipelines to allow them to actually be empty. Mapping over empty pipelines gives empty pipelines. Empty pipelines immediately return `None` when iterated. This removes a some of where `Span::new(0, 0)` was coming from, though there are other cases where we still use it. # User-Facing Changes 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.
85 lines
2.3 KiB
Rust
85 lines
2.3 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, 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<nu_protocol::PipelineData, nu_protocol::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 { let-env SPAM = 'eggs' }"#,
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result: Some(Value::Nothing {
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span: Span::test_data(),
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}),
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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 { let-env SPAM = 'eggs' }; $env.SPAM"#,
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result: Some(Value::string("eggs", Span::test_data())),
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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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