forked from extern/nushell
e4226def16
This commit extracts five new crates:
- nu-source, which contains the core source-code handling logic in Nu,
including Text, Span, and also the pretty.rs-based debug logic
- nu-parser, which is the parser and expander logic
- nu-protocol, which is the bulk of the types and basic conveniences
used by plugins
- nu-errors, which contains ShellError, ParseError and error handling
conveniences
- nu-textview, which is the textview plugin extracted into a crate
One of the major consequences of this refactor is that it's no longer
possible to `impl X for Spanned<Y>` outside of the `nu-source` crate, so
a lot of types became more concrete (Value became a concrete type
instead of Spanned<Value>, for example).
This also turned a number of inherent methods in the main nu crate into
plain functions (impl Value {} became a bunch of functions in the
`value` namespace in `crate::data::value`).
56 lines
1.3 KiB
Rust
56 lines
1.3 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::data::value;
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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_protocol::{ReturnSuccess, ReturnValue, Signature};
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use nu_errors::ShellError;
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use nu_source::PrettyDebug;
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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 = value::format_leaf(&row).plain_string(100000);
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yield ReturnSuccess::value(value::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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