forked from extern/nushell
130 lines
3.2 KiB
Rust
130 lines
3.2 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::prelude::*;
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use indexmap::map::IndexMap;
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use nu_errors::ShellError;
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use nu_protocol::{Primitive, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
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use nu_source::Tagged;
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pub struct Which;
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#[async_trait]
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impl WholeStreamCommand for Which {
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fn name(&self) -> &str {
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"which"
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}
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fn signature(&self) -> Signature {
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Signature::build("which")
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.required("application", SyntaxShape::String, "application")
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.switch("all", "list all executables", Some('a'))
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}
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fn usage(&self) -> &str {
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"Finds a program file."
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}
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async fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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which(args, registry).await
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}
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}
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/// Shortcuts for creating an entry to the output table
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fn entry(arg: impl Into<String>, path: Value, builtin: bool, tag: Tag) -> Value {
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let mut map = IndexMap::new();
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map.insert(
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"arg".to_string(),
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UntaggedValue::Primitive(Primitive::String(arg.into())).into_value(tag.clone()),
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);
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map.insert("path".to_string(), path);
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map.insert(
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"builtin".to_string(),
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UntaggedValue::Primitive(Primitive::Boolean(builtin)).into_value(tag.clone()),
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);
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UntaggedValue::row(map).into_value(tag)
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}
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macro_rules! entry_builtin {
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($arg:expr, $tag:expr) => {
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entry(
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$arg.clone(),
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UntaggedValue::Primitive(Primitive::String("nushell built-in command".to_string()))
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.into_value($tag.clone()),
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true,
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$tag,
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)
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};
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}
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macro_rules! entry_path {
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($arg:expr, $path:expr, $tag:expr) => {
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entry(
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$arg.clone(),
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UntaggedValue::Primitive(Primitive::Path($path)).into_value($tag.clone()),
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false,
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$tag,
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)
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};
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}
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#[derive(Deserialize, Debug)]
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struct WhichArgs {
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application: Tagged<String>,
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all: bool,
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}
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async fn which(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let registry = registry.clone();
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let mut output = vec![];
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let (WhichArgs { application, all }, _) = args.process(®istry).await?;
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let external = application.starts_with('^');
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let item = if external {
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application.item[1..].to_string()
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} else {
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application.item.clone()
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};
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if !external {
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let builtin = registry.has(&item);
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if builtin {
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output.push(ReturnSuccess::value(entry_builtin!(
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item,
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application.tag.clone()
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)));
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}
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}
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if let Ok(paths) = ichwh::which_all(&item).await {
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for path in paths {
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output.push(ReturnSuccess::value(entry_path!(
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item,
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path.into(),
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application.tag.clone()
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)));
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}
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}
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if all {
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Ok(futures::stream::iter(output.into_iter()).to_output_stream())
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} else {
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Ok(futures::stream::iter(output.into_iter().take(1)).to_output_stream())
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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::Which;
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#[test]
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fn examples_work_as_expected() {
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use crate::examples::test as test_examples;
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test_examples(Which {})
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}
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}
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