3ceb39c82c
* use arc to avoid cloning entire engine for menus * remove complete import path * remove stack clone * reference in completer
75 lines
2.4 KiB
Rust
75 lines
2.4 KiB
Rust
use crate::completions::{CompletionOptions, SortBy};
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use nu_protocol::{engine::StateWorkingSet, levenshtein_distance, Span};
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use reedline::Suggestion;
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// Completer trait represents the three stages of the completion
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// fetch, filter and sort
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pub trait Completer {
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fn fetch(
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&mut self,
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working_set: &StateWorkingSet,
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prefix: Vec<u8>,
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span: Span,
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offset: usize,
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pos: usize,
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) -> (Vec<Suggestion>, CompletionOptions);
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// Filter results using the completion options
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fn filter(
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&self,
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prefix: Vec<u8>,
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items: Vec<Suggestion>,
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options: CompletionOptions,
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) -> Vec<Suggestion> {
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items
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.into_iter()
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.filter(|it| {
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// Minimise clones for new functionality
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match (options.case_sensitive, options.positional) {
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(true, true) => it.value.as_bytes().starts_with(&prefix),
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(true, false) => it
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.value
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.contains(std::str::from_utf8(&prefix).unwrap_or("")),
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(false, positional) => {
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let value = it.value.to_lowercase();
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let prefix = std::str::from_utf8(&prefix).unwrap_or("").to_lowercase();
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if positional {
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value.starts_with(&prefix)
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} else {
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value.contains(&prefix)
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}
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}
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}
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})
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.collect()
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}
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// Sort results using the completion options
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fn sort(
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&self,
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items: Vec<Suggestion>,
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prefix: Vec<u8>,
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options: CompletionOptions,
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) -> Vec<Suggestion> {
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let prefix_str = String::from_utf8_lossy(&prefix).to_string();
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let mut filtered_items = items;
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// Sort items
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match options.sort_by {
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SortBy::LevenshteinDistance => {
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filtered_items.sort_by(|a, b| {
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let a_distance = levenshtein_distance(&prefix_str, &a.value);
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let b_distance = levenshtein_distance(&prefix_str, &b.value);
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a_distance.cmp(&b_distance)
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});
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}
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SortBy::Ascending => {
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filtered_items.sort_by(|a, b| a.value.cmp(&b.value));
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}
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SortBy::None => {}
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};
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filtered_items
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}
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}
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