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https://github.com/nushell/nushell.git
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f70c6d5d48
This commit extracts Tag, Span, Text, as well as source-related debug facilities into a new crate called nu_source. This change is much bigger than one might have expected because the previous code relied heavily on implementing inherent methods on `Tagged<T>` and `Spanned<T>`, which is no longer possible. As a result, this change creates more concrete types instead of using `Tagged<T>`. One notable example: Tagged<Value> became Value, and Value became UntaggedValue. This change clarifies the intent of the code in many places, but it does make it a big change.
53 lines
1.2 KiB
Rust
53 lines
1.2 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::errors::ShellError;
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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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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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"what?"
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}
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fn signature(&self) -> Signature {
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Signature::build("what?")
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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 = row.format_leaf().plain_string(100000);
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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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