nu-cli 0.114.1

CLI-related functionality for Nushell
Documentation 
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use std::sync::Arc;

use nu_engine::command_prelude::*;

use crate::syntax_highlight::highlight_syntax;

#[derive(Clone)]
pub struct NuHighlight;

impl Command for NuHighlight {
    fn name(&self) -> &str {
        "nu-highlight"
    }

    fn signature(&self) -> Signature {
        Signature::build("nu-highlight")
            .category(Category::Strings)
            .switch(
                "reject-garbage",
                "Return an error if invalid syntax (garbage) was encountered.",
                Some('r'),
            )
            .input_output_types(vec![(Type::String, Type::String)])
    }

    fn description(&self) -> &str {
        "Syntax highlight the input string."
    }

    fn search_terms(&self) -> Vec<&str> {
        vec!["syntax", "color", "convert"]
    }

    fn run(
        &self,
        engine_state: &EngineState,
        stack: &mut Stack,
        call: &Call,
        input: PipelineData,
    ) -> Result<PipelineData, ShellError> {
        let reject_garbage = call.has_flag(engine_state, stack, "reject-garbage")?;
        let head = call.head;

        let signals = engine_state.signals();

        let engine_state = Arc::new(engine_state.clone());
        let stack = Arc::new(stack.clone());

        input
            .map(
                move |x| match x.coerce_into_string() {
                    Ok(line) => {
                        let result = highlight_syntax(&engine_state, &stack, &line, line.len());

                        let highlights = match (reject_garbage, result.found_garbage) {
                            (false, _) => result.text,
                            (true, None) => result.text,
                            (true, Some(span)) => {
                                let error = ShellError::OutsideSpannedLabeledError {
                                    src: line,
                                    error: "encountered invalid syntax while highlighting".into(),
                                    msg: "invalid syntax".into(),
                                    span,
                                };
                                return Value::error(error, head);
                            }
                        };

                        Value::string(highlights.render_simple(), head)
                    }
                    Err(err) => Value::error(err, head),
                },
                signals,
            )
            .map(|mut pipeline| {
                if let Some(meta) = pipeline.metadata_mut() {
                    meta.content_type = None;
                }
                pipeline
            })
    }

    fn examples(&self) -> Vec<Example<'_>> {
        vec![Example {
            description: "Describe the type of a string",
            example: "'let x = 3' | nu-highlight",
            result: None,
        }]
    }
}