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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
66 lines
2.0 KiB
Rust
66 lines
2.0 KiB
Rust
use nu_engine::command_prelude::*;
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use unicode_segmentation::UnicodeSegmentation;
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#[derive(Clone)]
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pub struct SubCommand;
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impl Command for SubCommand {
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fn name(&self) -> &str {
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"commandline set-cursor"
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.input_output_types(vec![(Type::Nothing, Type::Nothing)])
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.switch(
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"end",
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"set the current cursor position to the end of the buffer",
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Some('e'),
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)
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.optional("pos", SyntaxShape::Int, "Cursor position to be set")
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.category(Category::Core)
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}
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fn description(&self) -> &str {
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"Set the current cursor position."
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["repl", "interactive"]
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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 mut repl = engine_state.repl_state.lock().expect("repl state mutex");
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if let Some(pos) = call.opt::<i64>(engine_state, stack, 0)? {
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repl.cursor_pos = if pos <= 0 {
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0usize
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} else {
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repl.buffer
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.grapheme_indices(true)
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.map(|(i, _c)| i)
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.nth(pos as usize)
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.unwrap_or(repl.buffer.len())
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};
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Ok(Value::nothing(call.head).into_pipeline_data())
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} else if call.has_flag(engine_state, stack, "end")? {
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repl.cursor_pos = repl.buffer.len();
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Ok(Value::nothing(call.head).into_pipeline_data())
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} else {
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Err(ShellError::GenericError {
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error: "Required a positional argument or a flag".to_string(),
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msg: "".to_string(),
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span: None,
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help: None,
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inner: vec![],
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})
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}
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}
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}
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