Implement `X` as extend selection to line bounds

book/src/keymap.md

@@ -73,6 +73,7 @@
 | `Alt-;`  | Flip selection cursor and anchor                                  |
 | `%`      | Select entire file                                                |
 | `x`      | Select current line, if already selected, extend to next line     |
+| `X`      | Extend selection to line bounds (line-wise selection)             |
 |          | Expand selection to parent syntax node TODO: pick a key           |
 | `J`      | join lines inside selection                                       |
 | `K`      | keep selections matching the regex TODO: overlapped by hover help |

helix-term/src/commands.rs

@@ -200,6 +200,7 @@ impl Command {
         extend_search_next,
         search_selection,
         extend_line,
+        extend_to_line_bounds,
         delete_selection,
         change_selection,
         collapse_selection,
@@ -1021,6 +1022,26 @@ fn extend_line(cx: &mut Context) {
     doc.set_selection(view.id, Selection::single(start, end));
 }
 
+fn extend_to_line_bounds(cx: &mut Context) {
+    let (view, doc) = current!(cx.editor);
+
+    let text = doc.text();
+    let selection = doc.selection(view.id).transform(|range| {
+        let start = text.line_to_char(text.char_to_line(range.from()));
+        let end = text
+            .line_to_char(text.char_to_line(range.to()) + 1)
+            .saturating_sub(1);
+
+        if range.anchor < range.head {
+            Range::new(start, end)
+        } else {
+            Range::new(end, start)
+        }
+    });
+
+    doc.set_selection(view.id, selection);
+}
+
 fn delete_selection_impl(reg: &mut Register, doc: &mut Document, view_id: ViewId) {
     // first yank the selection
     let values: Vec<String> = doc

helix-term/src/keymap.rs

@@ -209,7 +209,9 @@ impl Default for Keymaps {
             alt!(';') => Command::flip_selections,
             key!('%') => Command::select_all,
             key!('x') => Command::extend_line,
-            // extend_to_whole_line, crop_to_whole_line
+            key!('x') => Command::extend_line,
+            key!('X') => Command::extend_to_line_bounds,
+            // crop_to_whole_line
 
 
             key!('m') => Command::match_mode,