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fix(compatibility): improve handling of wide characters inserted in the middle of existing lines (#806)

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* fix(compatibility): handle wide characters inserted in line middle

* fix(compatibility): more wide char handling

* style(fmt): make rustfmt happy

* style(fmt): make clippy happy

* style(fmt): make clippyt happy

* style(fmt): make rustfmt happy... again
This commit is contained in:
Aram Drevekenin 2021-10-26 16:43:56 +02:00 committed by GitHub
parent 829882d556
commit 685b51efbb
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 93 additions and 15 deletions
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14
src/tests/fixtures/chinese_characters_line_middle vendored Normal file
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@ -0,0 +1,14 @@
% 
Temp/zellij/Chinese
❯ [?2004h 
Temp/zellij/Chinese
❯ ttput lines[?2004l
21
% 
Temp/zellij/Chinese
❯ [?2004httput cols[?2004l
86
% 
Temp/zellij/Chinese
❯ [?2004hrranger[?2004l
[?1049h(B[?7h[?1h[?25l[?1000h(Bloading...kranger\[?1h[?1000hkranger\ (Bjinho@pochita /home/jinho/Documents/Temp/zellij/Chinese/第一 (B Chinese (B (B 第一 0 (B ...(B 第三 0  第二 0  第五 0  第四 0  zellij-11.log 1.85 K  (Bzellij.log979 B drwxr-xr-x 2 jinho jinho 0 2021-10-13 10:312.8K sum, 933G free 1/7 Al[?7ll[?7h(Bempty(B(B三 第一 0 (B ...(B (B 第三 0 (B2(Bempty(B(B二(B...(B (B 第三 0 (B 第二 0 (B3(Bempty(B(B五(B...(B (B 第二 0 (B 第五 0 (B4(Bempty(B(B四(B...(B (B 第五 0 (B 第四 0 (B5(Bempty(B(B五(B 第五 0 (B 第四 0 (B4(B(B二(B 第二 0 (B 第五 0 (B3(B

45
zellij-server/src/panes/grid.rs
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@ -2087,6 +2087,19 @@ impl Row {
}
acc
}
pub fn absolute_character_index(&self, x: usize) -> usize {
// return x's width aware index
let mut absolute_index = x;
for (i, terminal_character) in self.columns.iter().enumerate().take(x) {
if i == absolute_index {
break;
}
if terminal_character.width > 1 {
absolute_index = absolute_index.saturating_sub(1);
}
}
absolute_index
}
pub fn add_character_at(&mut self, terminal_character: TerminalCharacter, x: usize) {
match self.width().cmp(&x) {
Ordering::Equal => {
@ -2099,18 +2112,30 @@ impl Row {
self.columns.push(terminal_character);
}
Ordering::Greater => {
let width_offset = self.excess_width_until(x);
// wide-character-aware index, where each character is counted once
let absolute_x_index = self.absolute_character_index(x);
let character_width = terminal_character.width;
let replaced_character = std::mem::replace(
&mut self.columns[x.saturating_sub(width_offset)],
terminal_character,
);
if character_width > replaced_character.width {
// this is done in a verbose manner because of performance
let width_difference = character_width - replaced_character.width;
for _ in 0..width_difference {
self.columns.pop();
let replaced_character =
std::mem::replace(&mut self.columns[absolute_x_index], terminal_character);
match character_width.cmp(&replaced_character.width) {
Ordering::Greater => {
// this is done in a verbose manner because of performance
let width_difference = character_width - replaced_character.width;
for _ in 0..width_difference {
let position_to_remove = absolute_x_index + 1;
if self.columns.get(position_to_remove).is_some() {
self.columns.remove(position_to_remove);
}
}
}
Ordering::Less => {
let width_difference = replaced_character.width - character_width;
for _ in 0..width_difference {
self.columns
.insert(absolute_x_index + 1, EMPTY_TERMINAL_CHARACTER);
}
}
_ => {}
}
}
}

12
zellij-server/src/panes/unit/grid_tests.rs
View File

@ -1010,3 +1010,15 @@ pub fn move_cursor_below_scroll_region() {
}
assert_snapshot!(format!("{:?}", grid));
}
#[test]
pub fn insert_wide_characters_in_existing_line() {
let mut vte_parser = vte::Parser::new();
let mut grid = Grid::new(21, 86, Palette::default());
let fixture_name = "chinese_characters_line_middle";
let content = read_fixture(fixture_name);
for byte in content {
vte_parser.advance(&mut grid, byte);
}
assert_snapshot!(format!("{:?}", grid));
}

27
zellij-server/src/panes/unit/snapshots/zellij_server__panes__grid__grid_tests__insert_wide_characters_in_existing_line.snap Normal file
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@ -0,0 +1,27 @@
---
source: zellij-server/src/panes/./unit/grid_tests.rs
expression: "format!(\"{:?}\", grid)"
---
00 (C): jinho@pochita /home/jinho/Documents/Temp/zellij/Chinese/第二
01 (C): Chinese 第一 0 empty
02 (C): 第三 0
03 (C): 第二 0
04 (C): 第五 0
05 (C): 第四 0
06 (C): zellij-11.log 1.85 K
07 (C): zellij.log 979 B
08 (C):
09 (C):
10 (C):
11 (C):
12 (C):
13 (C):
14 (C):
15 (C):
16 (C):
17 (C):
18 (C):
19 (C):
20 (C): drwxr-xr-x 2 jinho jinho 0 2021-10-13 10:31 2.8K sum, 933G free 3/7 All