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# Description
The meaning of the word usage is specific to describing how a command
function is *used* and not a synonym for general description. Usage can
be used to describe the SYNOPSIS or EXAMPLES sections of a man page
where the permitted argument combinations are shown or example *uses*
are given.
Let's not confuse people and call it what it is a description.
Our `help` command already creates its own *Usage* section based on the
available arguments and doesn't refer to the description with usage.
# User-Facing Changes
`help commands` and `scope commands` will now use `description` or
`extra_description`
`usage`-> `description`
`extra_usage` -> `extra_description`
Breaking change in the plugin protocol:
In the signature record communicated with the engine.
`usage`-> `description`
`extra_usage` -> `extra_description`
The same rename also takes place for the methods on
`SimplePluginCommand` and `PluginCommand`
# Tests + Formatting
- Updated plugin protocol specific changes
# After Submitting
- [ ] update plugin protocol doc
100 lines
2.8 KiB
Rust
100 lines
2.8 KiB
Rust
use nu_cmd_base::input_handler::{operate, CellPathOnlyArgs};
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use nu_engine::command_prelude::*;
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#[derive(Clone)]
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pub struct BytesReverse;
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impl Command for BytesReverse {
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fn name(&self) -> &str {
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"bytes reverse"
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}
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fn signature(&self) -> Signature {
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Signature::build("bytes reverse")
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.input_output_types(vec![
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(Type::Binary, Type::Binary),
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(Type::table(), Type::table()),
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(Type::record(), Type::record()),
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])
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.allow_variants_without_examples(true)
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.rest(
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"rest",
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SyntaxShape::CellPath,
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"For a data structure input, reverse data at the given cell paths.",
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)
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.category(Category::Bytes)
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}
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fn description(&self) -> &str {
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"Reverse the bytes in the pipeline."
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["convert", "inverse", "flip"]
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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let cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
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let arg = CellPathOnlyArgs::from(cell_paths);
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operate(reverse, arg, input, call.head, engine_state.signals())
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Reverse bytes `0x[1F FF AA AA]`",
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example: "0x[1F FF AA AA] | bytes reverse",
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result: Some(Value::binary(
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vec![0xAA, 0xAA, 0xFF, 0x1F],
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Span::test_data(),
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)),
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},
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Example {
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description: "Reverse bytes `0x[FF AA AA]`",
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example: "0x[FF AA AA] | bytes reverse",
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result: Some(Value::binary(vec![0xAA, 0xAA, 0xFF], Span::test_data())),
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},
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]
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}
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}
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fn reverse(val: &Value, _args: &CellPathOnlyArgs, span: Span) -> Value {
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let val_span = val.span();
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match val {
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Value::Binary { val, .. } => {
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let mut reversed_input = val.to_vec();
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reversed_input.reverse();
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Value::binary(reversed_input, val_span)
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}
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// Propagate errors by explicitly matching them before the final case.
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Value::Error { .. } => val.clone(),
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other => Value::error(
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ShellError::OnlySupportsThisInputType {
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exp_input_type: "binary".into(),
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wrong_type: other.get_type().to_string(),
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dst_span: span,
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src_span: other.span(),
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},
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span,
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),
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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::*;
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#[test]
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fn test_examples() {
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use crate::test_examples;
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test_examples(BytesReverse {})
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}
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}
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