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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>
77 lines
2.2 KiB
Rust
77 lines
2.2 KiB
Rust
use nu_engine::command_prelude::*;
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#[derive(Clone)]
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pub struct ViewFiles;
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impl Command for ViewFiles {
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fn name(&self) -> &str {
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"view files"
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}
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fn usage(&self) -> &str {
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"View the files registered in nushell's EngineState memory."
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}
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fn extra_usage(&self) -> &str {
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"These are files parsed and loaded at runtime."
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("view files")
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.input_output_types(vec![(
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Type::Nothing,
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Type::Table(
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[
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("filename".into(), Type::String),
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("start".into(), Type::Int),
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("end".into(), Type::Int),
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("size".into(), Type::Int),
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]
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.into(),
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),
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)])
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.category(Category::Debug)
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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 mut records = vec![];
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for file in engine_state.files() {
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let start = file.covered_span.start;
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let end = file.covered_span.end;
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records.push(Value::record(
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record! {
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"filename" => Value::string(&*file.name, call.head),
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"start" => Value::int(start as i64, call.head),
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"end" => Value::int(end as i64, call.head),
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"size" => Value::int(end as i64 - start as i64, call.head),
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},
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call.head,
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));
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}
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Ok(Value::list(records, call.head).into_pipeline_data())
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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: "View the files registered in Nushell's EngineState memory",
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example: r#"view files"#,
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result: None,
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},
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Example {
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description: "View how Nushell was originally invoked",
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example: r#"view files | get 0"#,
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result: None,
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},
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]
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}
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}
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