forked from extern/nushell
49 lines
1.3 KiB
Rust
49 lines
1.3 KiB
Rust
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use std::time::Instant;
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use nu_engine::eval_block;
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use nu_protocol::ast::Call;
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use nu_protocol::engine::{Command, EvaluationContext};
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use nu_protocol::{Signature, SyntaxShape, Value};
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pub struct Benchmark;
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impl Command for Benchmark {
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fn name(&self) -> &str {
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"benchmark"
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}
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fn usage(&self) -> &str {
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"Time the running time of a block"
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("benchmark").required(
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"block",
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SyntaxShape::Block(Some(vec![])),
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"the block to run",
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)
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}
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fn run(
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&self,
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context: &EvaluationContext,
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call: &Call,
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_input: Value,
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) -> Result<nu_protocol::Value, nu_protocol::ShellError> {
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let block = call.positional[0]
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.as_block()
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.expect("internal error: expected block");
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let engine_state = context.engine_state.borrow();
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let block = engine_state.get_block(block);
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let state = context.enter_scope();
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let start_time = Instant::now();
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eval_block(&state, block, Value::nothing())?;
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let end_time = Instant::now();
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println!("{} ms", (end_time - start_time).as_millis());
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Ok(Value::Nothing {
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span: call.positional[0].span,
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})
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}
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}
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