Updated to use grapheme helpers

book/src/keymap.md

@@ -109,10 +109,11 @@ Normal mode is the default mode when you launch helix. You can return to it from
 ### Selection manipulation
 
 | Key                  | Description                                                       | Command                              |
-| -----                 | -----------                                                       | -------                              |
+|----------------------| -----------                                                       | -------                              |
 | `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

@@ -1814,11 +1814,12 @@ fn select_all(cx: &mut Context) {
 
 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| {
-        vec![
+        [
-            Range::new(range.anchor, range.anchor + 1),
+            Range::new(range.from(), graphemes::next_grapheme_boundary(text, range.from())),
-            Range::new(range.head - 1, range.head),
+            Range::new(graphemes::prev_grapheme_boundary(text, range.to()), range.to())
         ]
         .into_iter()
     });