feat: support formatting greater hyphen to single arrow

lib/src/editor/editor_component/service/ime/non_delta_input_service.dart

@@ -192,7 +192,7 @@ class NonDeltaTextInputService extends TextInputService with TextInputClient {
         delta is TextEditingDeltaNonTextUpdate) {
       composingTextRange = delta.composing;
     }
-    
+
     // solve the issue where the Chinese IME doesn't continue deleting after the input content has been deleted.
     if (composingTextRange?.isCollapsed ?? false) {
       composingTextRange = TextRange.empty;

lib/src/editor/editor_component/service/shortcuts/character/double/format_arrow_character.dart

@@ -22,3 +22,24 @@ final CharacterShortcutEvent formatGreaterEqual = CharacterShortcutEvent(
     prefixCharacter: _equals,
   ),
 );
+
+const _hyphen = '-';
+const _singleArrow = '→';
+
+/// format '-' + '>' into an →
+///
+/// - support
+///   - desktop
+///   - mobile
+///   - web
+///
+final CharacterShortcutEvent formatGreaterHyphen = CharacterShortcutEvent(
+  key: 'format - + > into →',
+  character: _greater,
+  handler: (editorState) async => handleDoubleCharacterReplacement(
+    editorState: editorState,
+    character: _greater,
+    replacement: _singleArrow,
+    prefixCharacter: _hyphen,
+  ),
+);

test/new/editor_component/service/shortcuts/character_shortcuts/format_greater_hyphen_test.dart

@@ -0,0 +1,53 @@
+import 'package:appflowy_editor/appflowy_editor.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import '../../../../infra/testable_editor.dart';
+
+const _hyphen = '-';
+const _greater = '>';
+const _singleArrow = '→';
+
+void main() async {
+  group('format_arrow_character.dart', () {
+    testWidgets('hyphen + greater to single arrow', (tester) async {
+      final editor = tester.editor..addEmptyParagraph();
+      await editor.startTesting();
+
+      await editor.updateSelection(Selection.collapsed(Position(path: [0])));
+
+      await editor.ime.typeText(_hyphen);
+      await editor.ime.typeText(_greater);
+
+      final delta = editor.nodeAtPath([0])!.delta!;
+      expect(delta.length, 1);
+      expect(delta.toPlainText(), _singleArrow);
+
+      await editor.dispose();
+    });
+
+    testWidgets('hyphen + greater to single arrow with selection',
+        (tester) async {
+      const welcome = 'Welcome';
+      const initialText = '$_hyphen$welcome';
+
+      final editor = tester.editor..addParagraph(initialText: initialText);
+      await editor.startTesting();
+
+      await editor.updateSelection(
+        Selection.single(
+          path: [0],
+          startOffset: 1,
+          endOffset: initialText.length,
+        ),
+      );
+
+      await editor.ime.typeText(_greater);
+
+      final delta = editor.nodeAtPath([0])!.delta!;
+      expect(delta.length, 1);
+      expect(delta.toPlainText(), _singleArrow);
+
+      await editor.dispose();
+    });
+  });
+}

test/new/infra/testable_editor.dart

@@ -81,6 +81,10 @@ class TestableEditor {
             ...TestableFindAndReplaceCommands(context: context)
                 .testableFindAndReplaceCommands,
           ],
+          characterShortcutEvents: [
+            ...standardCharacterShortcutEvents,
+            formatGreaterHyphen,
+          ],
           editorStyle: inMobile
               ? EditorStyle.mobile(
                   defaultTextDirection: defaultTextDirection,