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Refactor align_selection by simplifying the calculation

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This commit is contained in:
Blaž Hrastnik 2022-03-03 10:29:46 +09:00
parent 1c1aee74b4
commit c0b86afdc8
1 changed files with 42 additions and 44 deletions
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86
helix-term/src/commands.rs
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@ -775,64 +775,62 @@ fn align_selections(cx: &mut Context) {
let (view, doc) = current!(cx.editor);
let text = doc.text().slice(..);
let selection = doc.selection(view.id);
let mut column_widths: Vec<Vec<_>> = vec![];
let mut column_widths: Vec<Vec<_>> = Vec::new();
let mut last_line = text.len_lines() + 1;
let mut column = 0;
// first of all, we need compute all column's width, let use max width of the selections in a column
for sel in selection {
let (l1, l2) = sel.line_range(text);
if l1 != l2 {
let mut col = 0;
for range in selection {
let coords = coords_at_pos(text, range.head);
let anchor_coords = coords_at_pos(text, range.anchor);
if coords.row != anchor_coords.row {
cx.editor
.set_error("align cannot work with multi line selections");
return;
}
// if the selection is not in the same line with last selection, we set the column to 0
column = if l1 != last_line { 0 } else { column + 1 };
last_line = l1;
// save all max line cursor of selections
let cursor = sel.to() - text.line_to_char(l1);
if column < column_widths.len() {
column_widths[column].push((l1, cursor));
} else {
column_widths.push(vec![(l1, cursor)]);
col = if coords.row == last_line { col + 1 } else { 0 };
if col >= column_widths.len() {
column_widths.push(Vec::new());
}
column_widths[col].push((range.from(), coords.col));
last_line = coords.row;
}
let mut max_curs = vec![];
for i in 0..column_widths.len() {
// compute max cursor of current column
let max_cur = column_widths[i]
.iter()
.fold(0, |max, &(_, cur)| max.max(cur));
max_curs.push(max_cur);
let mut pads = std::collections::HashMap::new();
for item in column_widths[i].iter_mut() {
pads.insert(item.0, max_cur - item.1);
}
// add pad to right columns
for col in column_widths[i + 1..].iter_mut() {
for item in col.iter_mut() {
item.1 += pads.get(&item.0).unwrap_or(&0);
let mut changes = Vec::with_capacity(selection.len());
// Account for changes on each row
let len = column_widths.first().map(|cols| cols.len()).unwrap_or(0);
let mut offs = vec![0; len];
for col in column_widths {
let max_col = col
.iter()
.enumerate()
.map(|(row, (_, cursor))| *cursor + offs[row])
.max()
.unwrap_or(0);
for (row, (insert_pos, last_col)) in col.into_iter().enumerate() {
let ins_count = max_col - (last_col + offs[row]);
if ins_count == 0 {
continue;
}
offs[row] += ins_count;
changes.push((insert_pos, insert_pos, Some(" ".repeat(ins_count).into())));
}
}
last_line = text.len_lines();
let transaction = Transaction::change_by_selection(doc.text(), selection, |range| {
let line = range.cursor_line(text);
column = if line != last_line { 0 } else { column + 1 };
last_line = line;
let max_cur = max_curs[column];
let new_cur = column_widths[column]
.iter()
.fold(max_cur, |c, (l, cur)| if *l == line { *cur } else { c });
let mut new_str = " ".repeat(max_cur - new_cur);
new_str.push_str(&range.fragment(text));
(range.from(), range.to(), Some(new_str.into()))
});
// The changeset has to be sorted
changes.sort_unstable_by_key(|(from, _, _)| *from);
let transaction = Transaction::change(doc.text(), changes.into_iter());
doc.apply(&transaction, view.id);
}