feat(term): uniformize word-wise movement and deletion (#2500)

Ctrl-based shortcuts are common in numerous applications.

This change:
- Adds Ctrl+{Left/Right/Backspace/Delete} for word-wise movement/deletion in prompt, picker, …
- Removes Alt-Left and Alt-Right in prompt, picker, …
- Adds Alt-Delete in insert mode for forward word deletion

In some terminals, Alt-Backspace might not work because it is ambigous.
See: https://github.com/helix-editor/helix/pull/2193#issuecomment-1105042501
Hence, Alt alternative is not removed.

book/src/keymap.md

@@ -303,8 +303,8 @@ undo-able "save point" until you return to normal mode.
 | `Escape`                                    | Switch to normal mode       | `normal_mode`           |
 | `Ctrl-x`                                    | Autocomplete                | `completion`            |
 | `Ctrl-r`                                    | Insert a register content   | `insert_register`       |
-| `Ctrl-w`, `Alt-Backspace` | Delete previous word        | `delete_word_backward`  |
+| `Ctrl-w`, `Alt-Backspace`, `Ctrl-Backspace` | Delete previous word        | `delete_word_backward`  |
-| `Alt-d`                   | Delete next word            | `delete_word_forward`   |
+| `Alt-d`, `Alt-Delete`, `Ctrl-Delete`        | Delete next word            | `delete_word_forward`   |
 | `Alt-b`, `Ctrl-Left`                        | Backward a word             | `move_prev_word_end`    |
 | `Ctrl-b`, `Left`                            | Backward a char             | `move_char_left`        |
 | `Alt-f`, `Ctrl-Right`                       | Forward a word              | `move_next_word_start`  |
@@ -361,14 +361,14 @@ Keys to use within prompt, Remapping currently not supported.
 | Key                                         | Description                                                             |
 | -----                                       | -------------                                                           |
 | `Escape`, `Ctrl-c`                          | Close prompt                                                            |
-| `Alt-b`, `Alt-Left`     | Backward a word                                                         |
+| `Alt-b`, `Ctrl-Left`                        | Backward a word                                                         |
 | `Ctrl-b`, `Left`                            | Backward a char                                                         |
-| `Alt-f`, `Alt-Right`    | Forward a word                                                          |
+| `Alt-f`, `Ctrl-Right`                       | Forward a word                                                          |
 | `Ctrl-f`, `Right`                           | Forward a char                                                          |
 | `Ctrl-e`, `End`                             | Move prompt end                                                         |
 | `Ctrl-a`, `Home`                            | Move prompt start                                                       |
-| `Ctrl-w`                | Delete previous word                                                    |
+| `Ctrl-w`, `Alt-Backspace`, `Ctrl-Backspace` | Delete previous word                                                    |
-| `Alt-d`                 | Delete next word                                                        |
+| `Alt-d`, `Alt-Delete`, `Ctrl-Delete`        | Delete next word                                                        |
 | `Ctrl-u`                                    | Delete to start of line                                                 |
 | `Ctrl-k`                                    | Delete to end of line                                                   |
 | `backspace`, `Ctrl-h`                       | Delete previous char                                                    |
@@ -380,4 +380,3 @@ Keys to use within prompt, Remapping currently not supported.
 | `Tab`                                       | Select next completion item                                             |
 | `BackTab`                                   | Select previous completion item                                         |
 | `Enter`                                     | Open selected                                                           |
-

helix-term/src/application.rs

@@ -350,7 +350,7 @@ impl Application {
     }
 
     fn refresh_config(&mut self) {
-        let config = Config::load(helix_loader::config_file()).unwrap_or_else(|err| {
+        let config = Config::load_default().unwrap_or_else(|err| {
             self.editor.set_error(err.to_string());
             Config::default()
         });

helix-term/src/keymap/default.rs

@@ -351,6 +351,7 @@ pub fn default() -> HashMap<Mode, Keymap> {
         "C-w" => delete_word_backward,
         "A-backspace" => delete_word_backward,
         "A-d" => delete_word_forward,
+        "A-del" => delete_word_forward,
         "C-s" => commit_undo_checkpoint,
 
         "left" => move_char_left,

helix-term/src/ui/prompt.rs

@@ -477,14 +477,14 @@ impl Component for Prompt {
                 (self.callback_fn)(cx, &self.line, PromptEvent::Abort);
                 return close_fn;
             }
-            alt!('b') | alt!(Left) => self.move_cursor(Movement::BackwardWord(1)),
+            alt!('b') | ctrl!(Left) => self.move_cursor(Movement::BackwardWord(1)),
-            alt!('f') | alt!(Right) => self.move_cursor(Movement::ForwardWord(1)),
+            alt!('f') | ctrl!(Right) => self.move_cursor(Movement::ForwardWord(1)),
             ctrl!('b') | key!(Left) => self.move_cursor(Movement::BackwardChar(1)),
             ctrl!('f') | key!(Right) => self.move_cursor(Movement::ForwardChar(1)),
             ctrl!('e') | key!(End) => self.move_end(),
             ctrl!('a') | key!(Home) => self.move_start(),
-            ctrl!('w') => self.delete_word_backwards(cx),
+            ctrl!('w') | alt!(Backspace) | ctrl!(Backspace) => self.delete_word_backwards(cx),
-            alt!('d') => self.delete_word_forwards(cx),
+            alt!('d') | alt!(Delete) | ctrl!(Delete) => self.delete_word_forwards(cx),
             ctrl!('k') => self.kill_to_end_of_line(cx),
             ctrl!('u') => self.kill_to_start_of_line(cx),
             ctrl!('h') | key!(Backspace) => {