feat: add word and WORD motions

src/session.rs

@@ -404,6 +404,55 @@ end
         assert!(session.editor().should_quit());
     }
 
+    #[test]
+    fn typed_word_motions_remap_keys_and_keep_insert_typing_in_one_undo_group() {
+        let fixture = Fixture::new();
+        fixture.file("buffer.txt", "foo...bar baz");
+        let mut session = fixture.open(
+            r#"
+Vamp.configure do |config|
+  config.bind "w", nil
+  config.bind "ctrl+f", config.core.word_next
+  config.bind "ctrl+p", config.core.word_previous
+  config.bind "ctrl+e", config.core.word_end
+  config.bind "ctrl+a", config.core.big_word_next
+  config.bind "ctrl+z", config.core.big_word_previous
+  config.bind "ctrl+t", config.core.big_word_end
+  config.bind "ctrl+b", config.core.word_previous, mode: config.modes.insert
+end
+"#,
+        );
+        session.handle(Input::Char('w'));
+        assert_eq!(session.editor().cursor().column, 0);
+        for (key, column) in [
+            ('f', 3),
+            ('e', 5),
+            ('f', 6),
+            ('p', 3),
+            ('z', 0),
+            ('a', 10),
+            ('t', 12),
+            ('z', 10),
+            ('z', 0),
+        ] {
+            session.handle(Input::Ctrl(key));
+            assert_eq!(session.editor().cursor().column, column, "{key}");
+        }
+        assert!(!session.editor().dirty());
+        session.handle(Input::Char('i'));
+        for ch in "wbeWBE".chars() {
+            session.handle(Input::Char(ch));
+        }
+        session.handle(Input::Ctrl('b'));
+        assert_eq!(session.editor().cursor().column, 0);
+        session.handle(Input::Char('X'));
+        session.handle(Input::Escape);
+        assert_eq!(session.editor().lines(), &["XwbeWBEfoo...bar baz"]);
+        session.handle(Input::Char('u'));
+        assert_eq!(session.editor().lines(), &["foo...bar baz"]);
+        assert!(!session.editor().dirty());
+    }
+
     #[test]
     fn typed_search_bindings_drive_navigation_and_the_search_prompt_only() {
         let fixture = Fixture::new();