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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>
41 lines
1.1 KiB
Rust
41 lines
1.1 KiB
Rust
use nu_engine::command_prelude::*;
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#[derive(Clone)]
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pub struct Panic;
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impl Command for Panic {
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fn name(&self) -> &str {
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"panic"
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}
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fn usage(&self) -> &str {
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"Executes a rust panic, useful only for testing."
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("panic")
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.input_output_types(vec![(Type::Nothing, Type::table())])
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// LsGlobPattern is similar to string, it won't auto-expand
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// and we use it to track if the user input is quoted.
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.optional("msg", SyntaxShape::String, "The glob pattern to use.")
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.category(Category::Experimental)
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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 maybe_msg: String = call
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.opt(engine_state, stack, 0)?
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.unwrap_or("Panic!".to_string());
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panic!("{}", maybe_msg)
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}
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fn examples(&self) -> Vec<Example> {
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vec![]
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}
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}
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