forked from extern/nushell
9996e4a1f8
# Description Continuing from #12568, this PR further reduces the size of `Expr` from 64 to 40 bytes. It also reduces `Expression` from 128 to 96 bytes and `Type` from 32 to 24 bytes. This was accomplished by: - for `Expr` with multiple fields (e.g., `Expr::Thing(A, B, C)`), merging the fields into new AST struct types and then boxing this struct (e.g. `Expr::Thing(Box<ABC>)`). - replacing `Vec<T>` with `Box<[T]>` in multiple places. `Expr`s and `Expression`s should rarely be mutated, if at all, so this optimization makes sense. By reducing the size of these types, I didn't notice a large performance improvement (at least compared to #12568). But this PR does reduce the memory usage of nushell. My config is somewhat light so I only noticed a difference of 1.4MiB (38.9MiB vs 37.5MiB). --------- Co-authored-by: Stefan Holderbach <sholderbach@users.noreply.github.com>
101 lines
2.9 KiB
Rust
101 lines
2.9 KiB
Rust
use nu_protocol::record;
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use nu_protocol::Value;
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use nu_protocol::{
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ast::Call,
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engine::{Command, EngineState, Stack},
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Category, Example, PipelineData, ShellError, Signature, Type,
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};
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#[derive(Clone)]
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pub struct UName;
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impl Command for UName {
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fn name(&self) -> &str {
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"uname"
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}
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fn signature(&self) -> Signature {
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Signature::build("uname")
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.input_output_types(vec![(Type::Nothing, Type::table())])
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.category(Category::System)
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}
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fn usage(&self) -> &str {
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"Print certain system information using uutils/coreutils uname."
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}
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fn search_terms(&self) -> Vec<&str> {
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// add other terms?
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vec!["system", "coreutils"]
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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 span = call.head;
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// Simulate `uname -all` is called every time
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let opts = uu_uname::Options {
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all: true,
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kernel_name: false,
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nodename: false,
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kernel_release: false,
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kernel_version: false,
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machine: false,
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processor: false,
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hardware_platform: false,
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os: false,
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};
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let output = uu_uname::UNameOutput::new(&opts).map_err(|e| ShellError::GenericError {
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error: format!("{}", e),
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msg: format!("{}", e),
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span: None,
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help: None,
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inner: Vec::new(),
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})?;
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let outputs = [
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output.kernel_name,
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output.nodename,
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output.kernel_release,
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output.kernel_version,
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output.machine,
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output.os,
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];
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let outputs = outputs
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.iter()
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.map(|name| {
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Ok(name
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.as_ref()
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.ok_or("unknown")
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.map_err(|_| ShellError::NotFound { span })?
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.to_string())
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})
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.collect::<Result<Vec<String>, ShellError>>()?;
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Ok(PipelineData::Value(
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Value::record(
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record! {
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"kernel-name" => Value::string(outputs[0].clone(), span),
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"nodename" => Value::string(outputs[1].clone(), span),
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"kernel-release" => Value::string(outputs[2].clone(), span),
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"kernel-version" => Value::string(outputs[3].clone(), span),
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"machine" => Value::string(outputs[4].clone(), span),
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"operating-system" => Value::string(outputs[5].clone(), span),
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},
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span,
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),
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None,
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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: "Print all information",
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example: "uname",
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result: None,
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}]
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}
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}
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