Reuse a text buffer for each gutter line

pull/1184/head
Blaž Hrastnik 3 years ago
parent ba45db84d4
commit 27c1a84f05

@ -421,6 +421,8 @@ impl EditorView {
.map(|range| range.cursor_line(text))
.collect();
use std::fmt::Write;
fn diagnostic<'doc>(
doc: &'doc Document,
_view: &View,
@ -435,18 +437,16 @@ impl EditorView {
let hint = theme.get("hint");
let diagnostics = doc.diagnostics();
Box::new(move |line: usize, _selected: bool| {
Box::new(move |line: usize, _selected: bool, out: &mut String| {
use helix_core::diagnostic::Severity;
if let Some(diagnostic) = diagnostics.iter().find(|d| d.line == line) {
return Some((
"●".to_string(),
match diagnostic.severity {
Some(Severity::Error) => error,
Some(Severity::Warning) | None => warning,
Some(Severity::Info) => info,
Some(Severity::Hint) => hint,
},
));
write!(out, "●").unwrap();
return Some(match diagnostic.severity {
Some(Severity::Error) => error,
Some(Severity::Warning) | None => warning,
Some(Severity::Info) => info,
Some(Severity::Hint) => hint,
});
}
None
})
@ -475,9 +475,10 @@ impl EditorView {
let config = config.line_number;
Box::new(move |line: usize, selected: bool| {
Box::new(move |line: usize, selected: bool, out: &mut String| {
if line == last_line && !draw_last {
Some((format!("{:>1$}", '~', width), linenr))
write!(out, "{:>1$}", '~', width).unwrap();
Some(linenr)
} else {
let line = match config {
LineNumber::Absolute => line + 1,
@ -494,25 +495,38 @@ impl EditorView {
} else {
linenr
};
Some((format!("{:>1$}", line, width), style))
write!(out, "{:>1$}", line, width).unwrap();
Some(style)
}
})
}
type GutterFn<'doc> = Box<dyn Fn(usize, bool) -> Option<(String, Style)> + 'doc>;
type GutterFn<'doc> = Box<dyn Fn(usize, bool, &mut String) -> Option<Style> + 'doc>;
type Gutter =
for<'doc> fn(&'doc Document, &View, &Theme, &Config, bool, usize) -> GutterFn<'doc>;
let gutters: &[(Gutter, usize)] = &[(diagnostic, 1), (line_number, 5)];
let mut offset = 0;
// avoid lots of small allocations by reusing a text buffer for each line
let mut text = String::with_capacity(8);
for (constructor, width) in gutters {
let gutter = constructor(doc, view, theme, config, is_focused, *width);
text.reserve(*width); // ensure there's enough space for the gutter
for (i, line) in (view.offset.row..(last_line + 1)).enumerate() {
let selected = cursors.contains(&line);
if let Some((text, style)) = gutter(line, selected) {
surface.set_stringn(viewport.x + offset, viewport.y + i as u16, text, 5, style);
if let Some(style) = gutter(line, selected, &mut text) {
surface.set_stringn(
viewport.x + offset,
viewport.y + i as u16,
&text,
*width,
style,
);
}
text.clear();
}
offset += *width as u16;
}

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