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use crate::completions::{
CommandCompletion, Completer, CustomCompletion, FileCompletion, FlagCompletion,
VariableCompletion,
};
use nu_parser::{flatten_expression, parse, FlatShape};
use nu_protocol::{
engine::{EngineState, Stack, StateWorkingSet},
Span, Value,
};
use reedline::{Completer as ReedlineCompleter, Suggestion};
use std::sync::Arc;
#[derive(Clone)]
pub struct NuCompleter {
engine_state: Arc<EngineState>,
stack: Stack,
config: Option<Value>,
}
impl NuCompleter {
pub fn new(engine_state: Arc<EngineState>, stack: Stack, config: Option<Value>) -> Self {
Self {
engine_state,
stack,
config,
}
}
fn process_completion<T: Completer>(
&self,
completer: &mut T,
working_set: &StateWorkingSet,
prefix: Vec<u8>,
new_span: Span,
offset: usize,
pos: usize,
) -> Vec<Suggestion> {
let (mut suggestions, options) =
completer.fetch(working_set, prefix.clone(), new_span, offset, pos);
suggestions = completer.filter(prefix.clone(), suggestions, options.clone());
suggestions = completer.sort(suggestions, prefix, options);
suggestions
}
fn completion_helper(&mut self, line: &str, pos: usize) -> Vec<Suggestion> {
let mut working_set = StateWorkingSet::new(&self.engine_state);
let offset = working_set.next_span_start();
let mut line = line.to_string();
line.insert(pos, 'a');
let pos = offset + pos;
let (output, _err) = parse(
&mut working_set,
Some("completer"),
line.as_bytes(),
false,
&[],
);
for pipeline in output.pipelines.into_iter() {
for expr in pipeline.expressions {
let flattened: Vec<_> = flatten_expression(&working_set, &expr);
for (flat_idx, flat) in flattened.iter().enumerate() {
if pos >= flat.0.start && pos < flat.0.end {
let new_span = Span {
start: flat.0.start,
end: flat.0.end - 1,
};
let mut prefix = working_set.get_span_contents(flat.0).to_vec();
prefix.remove(pos - flat.0.start);
if prefix.starts_with(b"$") {
let mut completer = VariableCompletion::new(self.engine_state.clone());
return self.process_completion(
&mut completer,
&working_set,
prefix,
new_span,
offset,
pos,
);
}
if prefix.starts_with(b"-") {
let mut completer = FlagCompletion::new(expr);
return self.process_completion(
&mut completer,
&working_set,
prefix,
new_span,
offset,
pos,
);
}
match &flat.1 {
FlatShape::Custom(decl_id) => {
let mut completer = CustomCompletion::new(
self.engine_state.clone(),
self.stack.clone(),
self.config.clone(),
*decl_id,
line,
);
return self.process_completion(
&mut completer,
&working_set,
prefix,
new_span,
offset,
pos,
);
}
FlatShape::Filepath | FlatShape::GlobPattern => {
let mut completer = FileCompletion::new(self.engine_state.clone());
return self.process_completion(
&mut completer,
&working_set,
prefix,
new_span,
offset,
pos,
);
}
flat_shape => {
let mut completer = CommandCompletion::new(
self.engine_state.clone(),
&working_set,
flattened.clone(),
flat_idx,
flat_shape.clone(),
);
return self.process_completion(
&mut completer,
&working_set,
prefix,
new_span,
offset,
pos,
);
}
};
}
}
}
}
return vec![];
}
}
impl ReedlineCompleter for NuCompleter {
fn complete(&mut self, line: &str, pos: usize) -> Vec<Suggestion> {
self.completion_helper(line, pos)
}
}
