nu-command 0.112.1

Nushell's built-in commands
Documentation 
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use nu_engine::command_prelude::*;
use nu_protocol::shell_error::generic::GenericError;
use nu_protocol::{Value, record};
use uucore::{localized_help_template, translate};

#[derive(Clone)]
pub struct UName;

impl Command for UName {
    fn name(&self) -> &str {
        "uname"
    }

    fn signature(&self) -> Signature {
        Signature::build("uname")
            .input_output_types(vec![(Type::Nothing, Type::table())])
            .category(Category::System)
    }

    fn description(&self) -> &str {
        "Print certain system information using uutils/coreutils uname."
    }

    fn search_terms(&self) -> Vec<&str> {
        vec!["system", "coreutils", "systeminfo"]
    }

    fn is_const(&self) -> bool {
        true
    }

    fn run(
        &self,
        _engine_state: &EngineState,
        _stack: &mut Stack,
        call: &Call,
        _input: PipelineData,
    ) -> Result<PipelineData, ShellError> {
        run_uname(call)
    }

    fn run_const(
        &self,
        _working_set: &StateWorkingSet,
        call: &Call,
        _input: PipelineData,
    ) -> Result<PipelineData, ShellError> {
        run_uname(call)
    }

    fn examples(&self) -> Vec<Example<'_>> {
        vec![Example {
            description: "Print all information",
            example: "uname",
            result: None,
        }]
    }
}

fn run_uname(call: &Call) -> Result<PipelineData, ShellError> {
    // setup the uutils error translation
    let _ = localized_help_template("uname");

    let span = call.head;
    // Simulate `uname -all` is called every time
    let opts = uu_uname::Options {
        all: true,
        kernel_name: false,
        nodename: false,
        kernel_release: false,
        kernel_version: false,
        machine: false,
        processor: false,
        hardware_platform: false,
        os: false,
    };
    let output = uu_uname::UNameOutput::new(&opts).map_err(|e| {
        ShellError::Generic(GenericError::new(
            format!("{e}"),
            translate!(&e.to_string()),
            span,
        ))
    })?;
    let outputs = [
        output.kernel_name,
        output.nodename,
        output.kernel_release,
        output.kernel_version,
        output.machine,
        output.os,
    ];
    let outputs = outputs
        .iter()
        .map(|name| {
            Ok(name
                .as_ref()
                .ok_or("unknown")
                .map_err(|_| ShellError::NotFound { span })?
                .to_string_lossy()
                .into_owned())
        })
        .collect::<Result<Vec<String>, ShellError>>()?;
    Ok(PipelineData::value(
        Value::record(
            record! {
                "kernel-name" => Value::string(outputs[0].clone(), span),
                "nodename" => Value::string(outputs[1].clone(), span),
                "kernel-release" => Value::string(outputs[2].clone(), span),
                "kernel-version" => Value::string(outputs[3].clone(), span),
                "machine" => Value::string(outputs[4].clone(), span),
                "operating-system" => Value::string(outputs[5].clone(), span),
            },
            span,
        ),
        None,
    ))
}