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Display highest severity diagnostic in gutter (#2835)

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* Display highest severity diagnostic in gutter

* Improve gutter diagnostic performance

Very slight improvement (doesn't really make a difference), iterates over the diagnostics of the line
once instead of twice.

* Add comment justifying unwrap
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A-Walrus 2022-06-21 05:39:43 +03:00 committed by GitHub
parent 009f8c4d3b
commit 43027d9104
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1 changed files with 12 additions and 1 deletions
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13
helix-view/src/gutter.rs
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@ -26,7 +26,18 @@ pub fn diagnostic<'doc>(
Box::new(move |line: usize, _selected: bool, out: &mut String| {
use helix_core::diagnostic::Severity;
if let Ok(index) = diagnostics.binary_search_by_key(&line, |d| d.line) {
let diagnostic = &diagnostics[index];
let after = diagnostics[index..].iter().take_while(|d| d.line == line);
let before = diagnostics[..index]
.iter()
.rev()
.take_while(|d| d.line == line);
let diagnostics_on_line = after.chain(before);
// This unwrap is safe because the iterator cannot be empty as it contains at least the item found by the binary search.
let diagnostic = diagnostics_on_line.max_by_key(|d| d.severity).unwrap();
write!(out, "●").unwrap();
return Some(match diagnostic.severity {
Some(Severity::Error) => error,