forked from extern/nushell
172 lines
6.2 KiB
Rust
172 lines
6.2 KiB
Rust
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use nu_engine::{eval_block, CallExt};
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use nu_protocol::{
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ast::Call,
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engine::{CaptureBlock, Command, EngineState, Stack},
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Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Value,
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};
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#[derive(Clone)]
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pub struct Find;
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impl Command for Find {
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fn name(&self) -> &str {
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"find"
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.named(
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"predicate",
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SyntaxShape::Block(Some(vec![SyntaxShape::Any])),
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"the predicate to satisfy",
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Some('p'),
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)
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.rest("rest", SyntaxShape::Any, "terms to search")
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.category(Category::Filters)
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}
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fn usage(&self) -> &str {
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"Searches terms in the input or for elements of the input that satisfies the predicate."
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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: "Search for multiple terms in a command output",
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example: r#"ls | find toml md sh"#,
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result: None,
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},
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Example {
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description: "Search for a term in a string",
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example: r#"echo Cargo.toml | find toml"#,
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result: Some(Value::test_string("Cargo.toml".to_owned()))
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},
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Example {
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description: "Search a number or a file size in a list of numbers",
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example: r#"[1 5 3kb 4 3Mb] | find 5 3kb"#,
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result: Some(Value::List {
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vals: vec![Value::test_int(5), Value::test_filesize(3000)],
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span: Span::test_data()
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}),
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},
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Example {
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description: "Search a char in a list of string",
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example: r#"[moe larry curly] | find l"#,
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result: Some(Value::List {
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vals: vec![Value::test_string("larry"), Value::test_string("curly")],
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span: Span::test_data()
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})
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},
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Example {
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description: "Find the first odd value",
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example: "echo [2 4 3 6 5 8] | find --predicate { ($it mod 2) == 1 }",
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result: Some(Value::List {
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vals: vec![Value::test_int(3), Value::test_int(5)],
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span: Span::test_data()
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})
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},
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Example {
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description: "Find if a service is not running",
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example: "echo [[version patch]; [0.1.0 $false] [0.1.1 $true] [0.2.0 $false]] | find -p { $it.patch }",
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result: Some(Value::List {
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vals: vec![Value::test_record(
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vec!["version", "patch"],
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vec![Value::test_string("0.1.1"), Value::test_bool(true)]
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)],
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span: Span::test_data()
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}),
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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 span = call.head;
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let ctrlc = engine_state.ctrlc.clone();
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let engine_state = engine_state.clone();
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match call.get_flag::<CaptureBlock>(&engine_state, stack, "predicate")? {
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Some(predicate) => {
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let capture_block = predicate;
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let block_id = capture_block.block_id;
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if !call.rest::<Value>(&engine_state, stack, 0)?.is_empty() {
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return Err(ShellError::IncompatibleParametersSingle(
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"expected either a predicate or terms, not both".to_owned(),
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span,
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));
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}
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let block = engine_state.get_block(block_id).clone();
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let var_id = block.signature.get_positional(0).and_then(|arg| arg.var_id);
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let mut stack = stack.captures_to_stack(&capture_block.captures);
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input.filter(
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move |value| {
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if let Some(var_id) = var_id {
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stack.add_var(var_id, value.clone());
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}
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eval_block(&engine_state, &mut stack, &block, PipelineData::new(span))
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.map_or(false, |pipeline_data| {
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pipeline_data.into_value(span).is_true()
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})
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},
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ctrlc,
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)
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}
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None => {
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let terms = call.rest::<Value>(&engine_state, stack, 0)?;
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input.filter(
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move |value| {
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terms.iter().any(|term| match value {
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Value::Bool { .. }
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| Value::Int { .. }
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| Value::Filesize { .. }
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| Value::Duration { .. }
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| Value::Date { .. }
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| Value::Range { .. }
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| Value::Float { .. }
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| Value::Block { .. }
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| Value::Nothing { .. }
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| Value::Error { .. } => {
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value.eq(span, term).map_or(false, |value| value.is_true())
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}
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Value::String { .. }
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| Value::List { .. }
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| Value::CellPath { .. }
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| Value::CustomValue { .. } => term
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.r#in(span, value)
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.map_or(false, |value| value.is_true()),
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Value::Record { vals, .. } => vals.iter().any(|val| {
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term.r#in(span, val).map_or(false, |value| value.is_true())
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}),
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Value::Binary { .. } => false,
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})
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},
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ctrlc,
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)
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}
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_examples() {
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use crate::test_examples;
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test_examples(Find)
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}
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}
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