Implement Kakoune's A-S: Select first and last chars

book/src/keymap.md

@@ -113,6 +113,7 @@ Normal mode is the default mode when you launch helix. You can return to it from
 | `s` | Select all regex matches inside selections | `select_regex` |
 | `S` | Split selection into sub selections on regex matches | `split_selection` |
 | `Alt-s` | Split selection on newlines | `split_selection_on_newline` |
+| `Alt-S` | Select first and last characters of each selection | `select_first_and_last_chars` |
 | `Alt-minus` | Merge selections | `merge_selections` |
 | `Alt-_` | Merge consecutive selections | `merge_consecutive_selections` |
 | `&` | Align selection in columns | `align_selections` |

helix-term/src/commands.rs

@@ -278,6 +278,7 @@ impl MappableCommand {
  half_page_up, "Move half page up",
  half_page_down, "Move half page down",
  select_all, "Select whole document",
+ select_first_and_last_chars, "Select first and last characters of each selection",
  select_regex, "Select all regex matches inside selections",
  split_selection, "Split selections on regex matches",
  split_selection_on_newline, "Split selection on newlines",
@@ -1811,6 +1812,21 @@ fn select_all(cx: &mut Context) {
  doc.set_selection(view.id, Selection::single(0, end))
 }
 
+fn select_first_and_last_chars(cx: &mut Context) {
+ let (view, doc) = current!(cx.editor);
+ let text = doc.text().slice(..);
+
+ let selection = doc.selection(view.id).clone().transform_iter(|range| {
+ [
+ Range::point(range.from()),
+ Range::point(graphemes::prev_grapheme_boundary(text, range.to())),
+ ]
+ .into_iter()
+ });
+
+ doc.set_selection(view.id, selection);
+}
+
 fn select_regex(cx: &mut Context) {
  let reg = cx.register.unwrap_or('/');
  ui::regex_prompt(

helix-term/src/keymap/default.rs

@@ -78,6 +78,7 @@ pub fn default() -> HashMap<Mode, KeyTrie> {
 
 
  "s" => select_regex,
+ "A-S" => select_first_and_last_chars,
  "A-s" => split_selection_on_newline,
  "A-minus" => merge_selections,
  "A-_" => merge_consecutive_selections,