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Refine autocompletion when text matches a prefix of the suggestion

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This commit is contained in:
Antonio Scandurra 2022-02-04 12:03:36 +01:00
parent ad13bcdbda
commit 32859a38ed
1 changed files with 24 additions and 16 deletions
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40
crates/editor/src/editor.rs
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@ -1699,31 +1699,39 @@ impl Editor {
};
let snapshot = self.buffer.read(cx).snapshot(cx);
let old_range = completion.old_range.to_offset(&snapshot);
let old_text = snapshot
.text_for_range(old_range.clone())
.collect::<String>();
let selections = self.local_selections::<usize>(cx);
let mut common_prefix_len = None;
let newest_selection = selections.iter().max_by_key(|s| s.id)?;
let lookbehind = newest_selection.start.saturating_sub(old_range.start);
let lookahead = old_range.end.saturating_sub(newest_selection.end);
let mut common_prefix_len = old_text
.bytes()
.zip(text.bytes())
.take_while(|(a, b)| a == b)
.count();
let mut ranges = Vec::new();
for selection in &selections {
let start = selection.start.saturating_sub(old_range.len());
let prefix_len = snapshot
.bytes_at(start)
.zip(completion.new_text.bytes())
.take_while(|(a, b)| a == b)
.count();
if common_prefix_len.is_none() {
common_prefix_len = Some(prefix_len);
}
if common_prefix_len == Some(prefix_len) {
ranges.push(start + prefix_len..selection.end);
if snapshot.contains_str_at(selection.start.saturating_sub(lookbehind), &old_text) {
let start = selection.start.saturating_sub(lookbehind);
let end = selection.end + lookahead;
ranges.push(start + common_prefix_len..end);
} else {
common_prefix_len.take();
common_prefix_len = 0;
ranges.clear();
ranges.extend(selections.iter().map(|s| s.start..s.end));
ranges.extend(selections.iter().map(|s| {
if s.id == newest_selection.id {
old_range.clone()
} else {
s.start..s.end
}
}));
break;
}
}
let common_prefix_len = common_prefix_len.unwrap_or(0);
let text = &text[common_prefix_len..];
self.start_transaction(cx);