forked from extern/nushell
cc9f41e553
# Description
Kind of a vague title, but this PR does two main things:
1. Rather than overriding functions like `Command::is_parser_keyword`,
this PR instead changes commands to override `Command::command_type`.
The `CommandType` returned by `Command::command_type` is then used to
automatically determine whether `Command::is_parser_keyword` and the
other `is_{type}` functions should return true. These changes allow us
to remove the `CommandType::Other` case and should also guarantee than
only one of the `is_{type}` functions on `Command` will return true.
2. Uses the new, reworked `Command::command_type` function in the `scope
commands` and `which` commands.
# User-Facing Changes
- Breaking change for `scope commands`: multiple columns (`is_builtin`,
`is_keyword`, `is_plugin`, etc.) have been merged into the `type`
column.
- Breaking change: the `which` command can now report `plugin` or
`keyword` instead of `built-in` in the `type` column. It may also now
report `external` instead of `custom` in the `type` column for known
`extern`s.
59 lines
1.5 KiB
Rust
59 lines
1.5 KiB
Rust
use nu_engine::command_prelude::*;
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use nu_protocol::engine::CommandType;
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#[derive(Clone)]
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pub struct Alias;
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impl Command for Alias {
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fn name(&self) -> &str {
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"alias"
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}
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fn usage(&self) -> &str {
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"Alias a command (with optional flags) to a new name."
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("alias")
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.input_output_types(vec![(Type::Nothing, Type::Nothing)])
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.required("name", SyntaxShape::String, "Name of the alias.")
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.required(
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"initial_value",
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SyntaxShape::Keyword(b"=".to_vec(), Box::new(SyntaxShape::Expression)),
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"Equals sign followed by value.",
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)
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.category(Category::Core)
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}
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fn extra_usage(&self) -> &str {
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r#"This command is a parser keyword. For details, check:
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https://www.nushell.sh/book/thinking_in_nu.html"#
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}
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fn command_type(&self) -> CommandType {
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CommandType::Keyword
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["abbr", "aka", "fn", "func", "function"]
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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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Ok(PipelineData::empty())
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Alias ll to ls -l",
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example: "alias ll = ls -l",
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result: Some(Value::nothing(Span::test_data())),
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}]
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}
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}
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