forked from extern/nushell
61 lines
1.2 KiB
Rust
61 lines
1.2 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::prelude::*;
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use nu_errors::ShellError;
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use nu_protocol::{ReturnSuccess, 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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#[async_trait]
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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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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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what(args, registry).await
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}
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}
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pub async fn what(
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args: CommandArgs,
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_registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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Ok(args
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.input
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.map(|row| {
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let name = value::format_type(&row, 100);
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ReturnSuccess::value(
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UntaggedValue::string(name).into_value(Tag::unknown_anchor(row.tag.span)),
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)
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})
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.to_output_stream())
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}
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#[cfg(test)]
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mod tests {
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use super::What;
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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(What {})
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}
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}
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