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use crate::help::highlight_search_in_table;
use nu_color_config::StyleComputer;
use nu_engine::{scope::ScopeData, CallExt};
use nu_protocol::{
ast::Call,
engine::{Command, EngineState, Stack},
span, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData,
ShellError, Signature, Span, Spanned, SyntaxShape, Type, Value,
};
use std::borrow::Cow;
#[derive(Clone)]
pub struct HelpAliases;
impl Command for HelpAliases {
fn name(&self) -> &str {
"help aliases"
}
fn usage(&self) -> &str {
"Show help on nushell aliases."
}
fn signature(&self) -> Signature {
Signature::build("help aliases")
.category(Category::Core)
.rest(
"rest",
SyntaxShape::String,
"the name of alias to get help on",
)
.named(
"find",
SyntaxShape::String,
"string to find in alias names and usage",
Some('f'),
)
.input_output_types(vec![(Type::Nothing, Type::Table(vec![]))])
.allow_variants_without_examples(true)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "show all aliases",
example: "help aliases",
result: None,
},
Example {
description: "show help for single alias",
example: "help aliases my-alias",
result: None,
},
Example {
description: "search for string in alias names and usages",
example: "help aliases --find my-alias",
result: None,
},
]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
_input: PipelineData,
) -> Result<PipelineData, ShellError> {
help_aliases(engine_state, stack, call)
}
}
pub fn help_aliases(
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
) -> Result<PipelineData, ShellError> {
let head = call.head;
let find: Option<Spanned<String>> = call.get_flag(engine_state, stack, "find")?;
let rest: Vec<Spanned<String>> = call.rest(engine_state, stack, 0)?;
let style_computer = StyleComputer::from_config(engine_state, stack);
let string_style = style_computer.compute("string", &Value::string("search result", head));
if let Some(f) = find {
let all_cmds_vec = build_help_aliases(engine_state, stack, head);
let found_cmds_vec =
highlight_search_in_table(all_cmds_vec, &f.item, &["name", "usage"], &string_style)?;
return Ok(found_cmds_vec
.into_iter()
.into_pipeline_data(engine_state.ctrlc.clone()));
}
if rest.is_empty() {
let found_cmds_vec = build_help_aliases(engine_state, stack, head);
Ok(found_cmds_vec
.into_iter()
.into_pipeline_data(engine_state.ctrlc.clone()))
} else {
let mut name = String::new();
for r in &rest {
if !name.is_empty() {
name.push(' ');
}
name.push_str(&r.item);
}
let alias_id = if let Some(id) = engine_state.find_alias(name.as_bytes(), &[]) {
id
} else {
return Err(ShellError::AliasNotFound(span(
&rest.iter().map(|r| r.span).collect::<Vec<Span>>(),
)));
};
let alias_expansion = engine_state
.get_alias(alias_id)
.iter()
.map(|span| String::from_utf8_lossy(engine_state.get_span_contents(span)))
.collect::<Vec<Cow<str>>>()
.join(" ");
let alias_usage = engine_state.build_alias_usage(alias_id);
const G: &str = "\x1b[32m"; const C: &str = "\x1b[36m"; const RESET: &str = "\x1b[0m"; let mut long_desc = String::new();
if let Some((usage, extra_usage)) = alias_usage {
long_desc.push_str(&usage);
long_desc.push_str("\n\n");
if !extra_usage.is_empty() {
long_desc.push_str(&extra_usage);
long_desc.push_str("\n\n");
}
}
long_desc.push_str(&format!("{G}Alias{RESET}: {C}{name}{RESET}"));
long_desc.push_str("\n\n");
long_desc.push_str(&format!("{G}Expansion{RESET}:\n {alias_expansion}"));
let config = engine_state.get_config();
if !config.use_ansi_coloring {
long_desc = nu_utils::strip_ansi_string_likely(long_desc);
}
Ok(Value::String {
val: long_desc,
span: call.head,
}
.into_pipeline_data())
}
}
fn build_help_aliases(engine_state: &EngineState, stack: &Stack, span: Span) -> Vec<Value> {
let mut scope_data = ScopeData::new(engine_state, stack);
scope_data.populate_aliases();
scope_data.collect_aliases(span)
}
#[cfg(test)]
mod test {
#[test]
fn test_examples() {
use super::HelpAliases;
use crate::test_examples;
test_examples(HelpAliases {})
}
}