Add `rotate_selections_{first,last}` commands (#13615)

book/src/generated/static-cmd.md

@@ -303,3 +303,5 @@
 | `extend_to_word` | Extend to a two-character label | select: `` gw `` |
 | `goto_next_tabstop` | Goto next snippet placeholder |  |
 | `goto_prev_tabstop` | Goto next snippet placeholder |  |
+| `rotate_selections_first` | Make the first selection your primary one |  |
+| `rotate_selections_last` | Make the last selection your primary one |  |

helix-term/src/commands.rs

@@ -601,6 +601,8 @@ impl MappableCommand {
         extend_to_word, "Extend to a two-character label",
         goto_next_tabstop, "Goto next snippet placeholder",
         goto_prev_tabstop, "Goto next snippet placeholder",
+        rotate_selections_first, "Make the first selection your primary one",
+        rotate_selections_last, "Make the last selection your primary one",
     );
 }
 
@@ -5292,6 +5294,21 @@ fn rotate_selections_backward(cx: &mut Context) {
     rotate_selections(cx, Direction::Backward)
 }
 
+fn rotate_selections_first(cx: &mut Context) {
+    let (view, doc) = current!(cx.editor);
+    let mut selection = doc.selection(view.id).clone();
+    selection.set_primary_index(0);
+    doc.set_selection(view.id, selection);
+}
+
+fn rotate_selections_last(cx: &mut Context) {
+    let (view, doc) = current!(cx.editor);
+    let mut selection = doc.selection(view.id).clone();
+    let len = selection.len();
+    selection.set_primary_index(len - 1);
+    doc.set_selection(view.id, selection);
+}
+
 enum ReorderStrategy {
     RotateForward,
     RotateBackward,