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Highlight matching text in file picker suggestions (#1635)

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* Highlight matching text in file picker suggestions

* Remove cache, specialize highlighting code

* Fix outdated comments
This commit is contained in:
Ludwig Stecher 2022-03-01 02:30:02 +01:00 committed by GitHub
parent b13d44156c
commit 59c691d2db
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 84 additions and 30 deletions
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4
helix-term/src/ui/editor.rs
View file

@ -688,12 +688,12 @@ impl EditorView {
surface.set_string_truncated(
viewport.x + 8, // 8: 1 space + 3 char mode string + 1 space + 1 spinner + 1 space
viewport.y,
title,
&title,
viewport
.width
.saturating_sub(6)
.saturating_sub(right_side_text.width() as u16 + 1) as usize, // "+ 1": a space between the title and the selection info
base_style,
|_| base_style,
true,
true,
);

40
helix-term/src/ui/picker.rs
View file

@ -24,7 +24,7 @@ use crate::ui::{Prompt, PromptEvent};
use helix_core::{movement::Direction, Position};
use helix_view::{
editor::Action,
graphics::{Color, CursorKind, Margin, Rect, Style},
graphics::{Color, CursorKind, Margin, Modifier, Rect, Style},
Document, Editor,
};
@ -343,7 +343,7 @@ impl<T> Picker<T> {
}
// TODO: maybe using format_fn isn't the best idea here
let text = (self.format_fn)(option);
// TODO: using fuzzy_indices could give us the char idx for match highlighting
// Highlight indices are computed lazily in the render function
self.matcher
.fuzzy_match(&text, pattern)
.map(|score| (index, score))
@ -483,6 +483,8 @@ impl<T: 'static> Component for Picker<T> {
fn render(&mut self, area: Rect, surface: &mut Surface, cx: &mut Context) {
let text_style = cx.editor.theme.get("ui.text");
let selected = cx.editor.theme.get("ui.text.focus");
let highlighted = cx.editor.theme.get("special").add_modifier(Modifier::BOLD);
// -- Render the frame:
// clear area
@ -525,29 +527,41 @@ impl<T: 'static> Component for Picker<T> {
// subtract area of prompt from top and current item marker " > " from left
let inner = inner.clip_top(2).clip_left(3);
let selected = cx.editor.theme.get("ui.text.focus");
let rows = inner.height;
let offset = self.cursor - (self.cursor % std::cmp::max(1, rows as usize));
let files = self.matches.iter().skip(offset).map(|(index, _score)| {
(index, self.options.get(*index).unwrap()) // get_unchecked
});
let files = self
.matches
.iter_mut()
.skip(offset)
.map(|(index, _score)| (*index, self.options.get(*index).unwrap()));
for (i, (_index, option)) in files.take(rows as usize).enumerate() {
if i == (self.cursor - offset) {
let is_active = i == (self.cursor - offset);
if is_active {
surface.set_string(inner.x.saturating_sub(2), inner.y + i as u16, ">", selected);
}
let formatted = (self.format_fn)(option);
let (_score, highlights) = self
.matcher
.fuzzy_indices(&formatted, &self.prompt.line)
.unwrap_or_default();
surface.set_string_truncated(
inner.x,
inner.y + i as u16,
(self.format_fn)(option),
&formatted,
inner.width as usize,
if i == (self.cursor - offset) {
selected
} else {
text_style
|idx| {
if highlights.contains(&idx) {
highlighted
} else if is_active {
selected
} else {
text_style
}
},
true,
self.truncate_start,

70
helix-tui/src/buffer.rs
View file

@ -287,7 +287,7 @@ impl Buffer {
where
S: AsRef<str>,
{
self.set_string_truncated(x, y, string, width, style, false, false)
self.set_string_truncated_at_end(x, y, string.as_ref(), width, style)
}
/// Print at most the first `width` characters of a string if enough space is available
@ -295,19 +295,16 @@ impl Buffer {
/// truncated lines. If `truncate_start` is `true`, truncate the beginning of the string
/// instead of the end.
#[allow(clippy::too_many_arguments)]
pub fn set_string_truncated<S>(
pub fn set_string_truncated(
&mut self,
x: u16,
y: u16,
string: S,
string: &str,
width: usize,
style: Style,
style: impl Fn(usize) -> Style, // Map a grapheme's string offset to a style
ellipsis: bool,
truncate_start: bool,
) -> (u16, u16)
where
S: AsRef<str>,
{
) -> (u16, u16) {
// prevent panic if out of range
if !self.in_bounds(x, y) || width == 0 {
return (x, y);
@ -316,10 +313,10 @@ impl Buffer {
let mut index = self.index_of(x, y);
let mut x_offset = x as usize;
let width = if ellipsis { width - 1 } else { width };
let graphemes = UnicodeSegmentation::graphemes(string.as_ref(), true);
let graphemes = string.grapheme_indices(true);
let max_offset = min(self.area.right() as usize, width.saturating_add(x as usize));
if !truncate_start {
for s in graphemes {
for (byte_offset, s) in graphemes {
let width = s.width();
if width == 0 {
continue;
@ -331,7 +328,7 @@ impl Buffer {
}
self.content[index].set_symbol(s);
self.content[index].set_style(style);
self.content[index].set_style(style(byte_offset));
// Reset following cells if multi-width (they would be hidden by the grapheme),
for i in index + 1..index + width {
self.content[i].reset();
@ -339,14 +336,14 @@ impl Buffer {
index += width;
x_offset += width;
}
if ellipsis && x_offset - (x as usize) < string.as_ref().width() {
if ellipsis && x_offset - (x as usize) < string.width() {
self.content[index].set_symbol("…");
}
} else {
let mut start_index = self.index_of(x, y);
let mut index = self.index_of(max_offset as u16, y);
let total_width = string.as_ref().width();
let total_width = string.width();
let truncated = total_width > width;
if ellipsis && truncated {
self.content[start_index].set_symbol("…");
@ -355,7 +352,7 @@ impl Buffer {
if !truncated {
index -= width - total_width;
}
for s in graphemes.rev() {
for (byte_offset, s) in graphemes.rev() {
let width = s.width();
if width == 0 {
continue;
@ -365,7 +362,7 @@ impl Buffer {
break;
}
self.content[start].set_symbol(s);
self.content[start].set_style(style);
self.content[start].set_style(style(byte_offset));
for i in start + 1..index {
self.content[i].reset();
}
@ -375,6 +372,49 @@ impl Buffer {
(x_offset as u16, y)
}
/// Print at most the first `width` characters of a string if enough space is available
/// until the end of the line.
pub fn set_string_truncated_at_end(
&mut self,
x: u16,
y: u16,
string: &str,
width: usize,
style: Style,
) -> (u16, u16) {
// prevent panic if out of range
if !self.in_bounds(x, y) {
return (x, y);
}
let mut index = self.index_of(x, y);
let mut x_offset = x as usize;
let max_x_offset = min(self.area.right() as usize, width.saturating_add(x as usize));
for s in string.graphemes(true) {
let width = s.width();
if width == 0 {
continue;
}
// `x_offset + width > max_offset` could be integer overflow on 32-bit machines if we
// change dimensions to usize or u32 and someone resizes the terminal to 1x2^32.
if width > max_x_offset.saturating_sub(x_offset) {
break;
}
self.content[index].set_symbol(s);
self.content[index].set_style(style);
// Reset following cells if multi-width (they would be hidden by the grapheme),
for i in index + 1..index + width {
self.content[i].reset();
}
index += width;
x_offset += width;
}
(x_offset as u16, y)
}
pub fn set_spans<'a>(&mut self, x: u16, y: u16, spans: &Spans<'a>, width: u16) -> (u16, u16) {
let mut remaining_width = width;
let mut x = x;