nu-command 0.112.2

Nushell's built-in commands
Documentation 
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use nu_engine::command_prelude::*;
use nu_protocol::OutDest;
use nu_protocol::shell_error::generic::GenericError;

#[derive(Clone)]
pub struct Complete;

impl Command for Complete {
    fn name(&self) -> &str {
        "complete"
    }

    fn signature(&self) -> Signature {
        Signature::build("complete")
            .category(Category::System)
            .input_output_types(vec![(Type::Any, Type::record())])
    }

    fn description(&self) -> &str {
        "Capture the outputs and exit code from an external piped in command in a nushell table."
    }

    fn extra_description(&self) -> &str {
        "In order to capture stdout, stderr, and exit_code, externally piped in commands need to be wrapped with `do`"
    }

    fn run(
        &self,
        _engine_state: &EngineState,
        _stack: &mut Stack,
        call: &Call,
        input: PipelineData,
    ) -> Result<PipelineData, ShellError> {
        let head = call.head;
        match input {
            PipelineData::ByteStream(stream, ..) => {
                let Ok(mut child) = stream.into_child() else {
                    return Err(ShellError::Generic(GenericError::new(
                        "Complete only works with external commands",
                        "complete only works on external commands",
                        call.head,
                    )));
                };

                // `complete` reports non-zero status via its `exit_code` field.
                // Mark child status as handled so global `pipefail` does not raise
                // `non_zero_exit_code` after this command has already captured it.
                #[cfg(feature = "os")]
                child.ignore_error(true);

                let output = child.wait_with_output()?;
                let exit_code = output.exit_status.code();
                let mut record = Record::new();

                if let Some(stdout) = output.stdout {
                    record.push(
                        "stdout",
                        match String::from_utf8(stdout) {
                            Ok(str) => Value::string(str, head),
                            Err(err) => Value::binary(err.into_bytes(), head),
                        },
                    );
                }

                if let Some(stderr) = output.stderr {
                    record.push(
                        "stderr",
                        match String::from_utf8(stderr) {
                            Ok(str) => Value::string(str, head),
                            Err(err) => Value::binary(err.into_bytes(), head),
                        },
                    );
                }

                record.push("exit_code", Value::int(exit_code.into(), head));

                Ok(Value::record(record, call.head).into_pipeline_data())
            }
            // bubble up errors from the previous command
            PipelineData::Value(Value::Error { error, .. }, _) => Err(*error),
            _ => Err(ShellError::Generic(GenericError::new(
                "Complete only works with external commands",
                "complete only works on external commands",
                head,
            ))),
        }
    }

    fn examples(&self) -> Vec<Example<'_>> {
        vec![Example {
            description: "Run the external command to completion, capturing stdout, stderr, and exit_code",
            example: "^external arg1 | complete",
            result: None,
        }]
    }

    fn pipe_redirection(&self) -> (Option<OutDest>, Option<OutDest>) {
        (Some(OutDest::PipeSeparate), Some(OutDest::PipeSeparate))
    }
}