refactor align_selection using kakoune logic

pull/1724/head
Bob Qi 3 years ago committed by Blaž Hrastnik
parent 5c810e5e52
commit 1c1aee74b4

@ -772,18 +772,11 @@ fn trim_selections(cx: &mut Context) {
// align text in selection
fn align_selections(cx: &mut Context) {
let align_style = cx.count();
if align_style > 3 {
cx.editor
.set_error("align only accept 1,2,3 as count to set left/center/right align");
return;
}
let (view, doc) = current!(cx.editor);
let text = doc.text().slice(..);
let selection = doc.selection(view.id);
let mut column_widths = vec![];
let mut last_line = text.len_lines();
let mut column_widths: Vec<Vec<_>> = vec![];
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 {
@ -797,47 +790,52 @@ fn align_selections(cx: &mut Context) {
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() {
if sel.to() - sel.from() > column_widths[column] {
column_widths[column] = sel.to() - sel.from();
}
column_widths[column].push((l1, cursor));
} else {
// a new column, current selection width is the temp width of the column
column_widths.push(sel.to() - sel.from());
column_widths.push(vec![(l1, cursor)]);
}
}
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);
}
}
}
last_line = text.len_lines();
// once we get the with of each column, we transform each selection with to it's column width based on the align style
let transaction = Transaction::change_by_selection(doc.text(), selection, |range| {
let l = range.cursor_line(text);
column = if l != last_line { 0 } else { column + 1 };
last_line = l;
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(
align_fragment_to_width(&range.fragment(text), column_widths[column], align_style)
.into(),
),
)
(range.from(), range.to(), Some(new_str.into()))
});
doc.apply(&transaction, view.id);
}
fn align_fragment_to_width(fragment: &str, width: usize, align_style: usize) -> String {
let trimed = fragment.trim_matches(|c| c == ' ');
let mut s = " ".repeat(width - trimed.chars().count());
match align_style {
1 => s.insert_str(0, trimed), // left align
2 => s.insert_str(s.len() / 2, trimed), // center align
3 => s.push_str(trimed), // right align
n => unimplemented!("{}", n),
}
s
}
fn goto_window(cx: &mut Context, align: Align) {
let count = cx.count() - 1;
let (view, doc) = current!(cx.editor);

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