forked from extern/nushell
b2c5af457e
This improves incremental build time when working on what was previously the root package. For example, previously all plugins would be rebuilt with a change to `src/commands/classified/external.rs`, but now only `nu-cli` will have to be rebuilt (and anything that depends on it).
54 lines
1.3 KiB
Rust
54 lines
1.3 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::prelude::*;
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use futures::StreamExt;
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use futures_util::pin_mut;
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use nu_errors::ShellError;
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use nu_protocol::{ReturnSuccess, ReturnValue, Signature, UntaggedValue};
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pub struct What;
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#[derive(Deserialize)]
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pub struct WhatArgs {}
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impl WholeStreamCommand for What {
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fn name(&self) -> &str {
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"describe"
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}
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fn signature(&self) -> Signature {
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Signature::build("describe")
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}
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fn usage(&self) -> &str {
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"Describes the objects in the stream."
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}
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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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args.process(registry, what)?.run()
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}
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}
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pub fn what(
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WhatArgs {}: WhatArgs,
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RunnableContext { input, .. }: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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let stream = async_stream! {
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let values = input.values;
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pin_mut!(values);
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while let Some(row) = values.next().await {
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let name = value::format_type(&row, 100);
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yield ReturnSuccess::value(UntaggedValue::string(name).into_value(Tag::unknown_anchor(row.tag.span)));
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}
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};
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let stream: BoxStream<'static, ReturnValue> = stream.boxed();
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Ok(OutputStream::from(stream))
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}
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