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>
69 lines
1.9 KiB
Rust
69 lines
1.9 KiB
Rust
use nu_engine::command_prelude::*;
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use terminal_size::{terminal_size, Height, Width};
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#[derive(Clone)]
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pub struct TermSize;
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impl Command for TermSize {
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fn name(&self) -> &str {
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"term size"
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}
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fn usage(&self) -> &str {
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"Returns a record containing the number of columns (width) and rows (height) of the terminal."
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}
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fn signature(&self) -> Signature {
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Signature::build("term size")
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.category(Category::Platform)
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.input_output_types(vec![(
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Type::Nothing,
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Type::Record([("columns".into(), Type::Int), ("rows".into(), Type::Int)].into()),
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)])
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Return the columns (width) and rows (height) of the terminal",
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example: "term size",
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result: None,
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},
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Example {
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description: "Return the columns (width) of the terminal",
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example: "(term size).columns",
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result: None,
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},
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Example {
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description: "Return the rows (height) of the terminal",
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example: "(term size).rows",
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result: None,
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},
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]
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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 head = call.head;
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let (cols, rows) = match terminal_size() {
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Some((w, h)) => (Width(w.0), Height(h.0)),
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None => (Width(0), Height(0)),
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};
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Ok(Value::record(
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record! {
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"columns" => Value::int(cols.0 as i64, head),
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"rows" => Value::int(rows.0 as i64, head),
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},
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head,
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)
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.into_pipeline_data())
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}
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}
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