forked from extern/nushell
a5c604c283
# Description Working on uniformizing the ending messages regarding methods usage() and extra_usage(). This is related to the issue https://github.com/nushell/nushell/issues/5066 after discussing it with @jntrnr # 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.
69 lines
2.4 KiB
Rust
69 lines
2.4 KiB
Rust
use nu_engine::CallExt;
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use nu_protocol::ast::Call;
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use nu_protocol::engine::{Command, EngineState, Stack};
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use nu_protocol::{
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Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, Span, Spanned,
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SyntaxShape, Type, Value,
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};
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#[derive(Clone)]
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pub struct ViewSpan;
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impl Command for ViewSpan {
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fn name(&self) -> &str {
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"view span"
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}
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fn usage(&self) -> &str {
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"View the contents of a span."
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}
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fn extra_usage(&self) -> &str {
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"This command is meant for debugging purposes.\nIt allows you to view the contents of nushell spans.\nOne way to get spans is to pipe something into 'debug --raw'.\nThen you can use the Span { start, end } values as the start and end values for this command."
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("view span")
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.input_output_types(vec![(Type::Nothing, Type::String)])
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.required("start", SyntaxShape::Int, "start of the span")
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.required("end", SyntaxShape::Int, "end of the span")
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.category(Category::Debug)
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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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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 start_span: Spanned<usize> = call.req(engine_state, stack, 0)?;
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let end_span: Spanned<usize> = call.req(engine_state, stack, 1)?;
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if start_span.item < end_span.item {
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let bin_contents =
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engine_state.get_span_contents(&Span::new(start_span.item, end_span.item));
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Ok(
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Value::string(String::from_utf8_lossy(bin_contents), call.head)
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.into_pipeline_data(),
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)
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} else {
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Err(ShellError::GenericError(
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"Cannot view span".to_string(),
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"this start and end does not correspond to a viewable value".to_string(),
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Some(call.head),
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None,
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Vec::new(),
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))
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}
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "View the source of a span. 1 and 2 are just example values. Use the return of debug -r to get the actual values",
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example: r#"some | pipeline | or | variable | debug -r; view span 1 2"#,
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result: None,
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}]
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}
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}
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