feat: add option to paste plain text

frontend/appflowy_flutter/integration_test/desktop/document/document_copy_and_paste_test.dart

@@ -1,7 +1,5 @@
 import 'dart:io';
 
-import 'package:flutter/services.dart';
-
 import 'package:appflowy/generated/locale_keys.g.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/block_menu/block_menu_button.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/copy_and_paste/clipboard_service.dart';
@@ -11,6 +9,7 @@ import 'package:appflowy/startup/startup.dart';
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:appflowy_editor_plugins/appflowy_editor_plugins.dart';
 import 'package:easy_localization/easy_localization.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:integration_test/integration_test.dart';
 import 'package:universal_platform/universal_platform.dart';
@@ -27,10 +26,13 @@ void main() {
       await tester.pasteContent(
         plainText: List.generate(lines, (index) => 'line $index').join('\n'),
         (editorState) {
-          expect(editorState.document.root.children.length, 3);
+          expect(editorState.document.root.children.length, 1);
+          final text =
+              editorState.document.root.children.first.delta!.toPlainText();
+          final textLines = text.split('\n');
           for (var i = 0; i < lines; i++) {
             expect(
-              editorState.getNodeAtPath([i])!.delta!.toPlainText(),
+              textLines[i],
               'line $i',
             );
           }
@@ -467,6 +469,52 @@ void main() {
       expect(node.attributes[ImageBlockKeys.url], isNotEmpty);
     });
   });
+
+  testWidgets('paste markdowns', (tester) async {
+    await tester.pasteContent(
+      plainText: '''
+# I'm h1
+## I'm h2
+### I'm h3
+#### I'm h4
+##### I'm h5
+###### I'm h6''',
+      (editorState) {
+        final children = editorState.document.root.children;
+        expect(children.length, 6);
+        for (var i = 0; i < children.length; i++) {
+          final text = children[i].delta!.toPlainText();
+          expect(
+            text,
+            'I\'m h${i + 1}',
+          );
+        }
+      },
+    );
+  });
+
+  testWidgets('paste markdowns as plain', (tester) async {
+    const markdown = '''
+# I'm h1
+## I'm h2
+### I'm h3
+#### I'm h4
+##### I'm h5
+###### I'm h6''';
+    await tester.pasteContent(
+      plainText: markdown,
+      pasteAsPlain: true,
+      (editorState) {
+        final children = editorState.document.root.children;
+        expect(children.length, 6);
+        for (var i = 0; i < children.length; i++) {
+          final text = children[i].delta!.toPlainText();
+          final expectText = '${'#' * (i + 1)} I\'m h${i + 1}';
+          expect(text, expectText);
+        }
+      },
+    );
+  });
 }
 
 extension on WidgetTester {
@@ -476,6 +524,7 @@ extension on WidgetTester {
     String? plainText,
     String? html,
     String? inAppJson,
+    bool pasteAsPlain = false,
     (String, Uint8List?)? image,
   }) async {
     await initializeAppFlowy();
@@ -502,6 +551,7 @@ extension on WidgetTester {
     await simulateKeyEvent(
       LogicalKeyboardKey.keyV,
       isControlPressed: Platform.isLinux || Platform.isWindows,
+      isShiftPressed: pasteAsPlain,
       isMetaPressed: Platform.isMacOS,
     );
     await pumpAndSettle();

frontend/appflowy_flutter/integration_test/desktop/document/document_find_menu_test.dart

@@ -37,12 +37,12 @@ void main() {
 
       // set clipboard data
       final data = [
-        "123456\n",
-        ...List.generate(100, (_) => "${generateRandomString(50)}\n"),
-        "1234567\n",
-        ...List.generate(100, (_) => "${generateRandomString(50)}\n"),
-        "12345678\n",
-        ...List.generate(100, (_) => "${generateRandomString(50)}\n"),
+        "123456\n\n",
+        ...List.generate(100, (_) => "${generateRandomString(50)}\n\n"),
+        "1234567\n\n",
+        ...List.generate(100, (_) => "${generateRandomString(50)}\n\n"),
+        "12345678\n\n",
+        ...List.generate(100, (_) => "${generateRandomString(50)}\n\n"),
       ].join();
       await getIt<ClipboardService>().setData(
         ClipboardServiceData(

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/context_menu/custom_context_menu.dart

@@ -13,6 +13,11 @@ final List<List<ContextMenuItem>> customContextMenuItems = [
       getName: LocaleKeys.document_plugins_contextMenu_paste.tr,
       onPressed: (editorState) => customPasteCommand.execute(editorState),
     ),
+    ContextMenuItem(
+      getName: LocaleKeys.document_plugins_contextMenu_pasteAsPlainText.tr,
+      onPressed: (editorState) =>
+          customPastePlainTextCommand.execute(editorState),
+    ),
     ContextMenuItem(
       getName: LocaleKeys.document_plugins_contextMenu_cut.tr,
       onPressed: (editorState) => customCutCommand.execute(editorState),

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/copy_and_paste/custom_paste_command.dart

@@ -29,6 +29,14 @@ final CommandShortcutEvent customPasteCommand = CommandShortcutEvent(
   handler: _pasteCommandHandler,
 );
 
+final CommandShortcutEvent customPastePlainTextCommand = CommandShortcutEvent(
+  key: 'paste the plain content',
+  getDescription: () => AppFlowyEditorL10n.current.cmdPasteContent,
+  command: 'ctrl+shift+v',
+  macOSCommand: 'cmd+shift+v',
+  handler: _pastePlainCommandHandler,
+);
+
 CommandShortcutEventHandler _pasteCommandHandler = (editorState) {
   final selection = editorState.selection;
   if (selection == null) {
@@ -45,6 +53,22 @@ CommandShortcutEventHandler _pasteCommandHandler = (editorState) {
   return KeyEventResult.handled;
 };
 
+CommandShortcutEventHandler _pastePlainCommandHandler = (editorState) {
+  final selection = editorState.selection;
+  if (selection == null) {
+    return KeyEventResult.ignored;
+  }
+
+  doPlainPaste(editorState).then((_) {
+    final context = editorState.document.root.context;
+    if (context != null && context.mounted) {
+      context.read<ClipboardState>().didPaste();
+    }
+  });
+
+  return KeyEventResult.handled;
+};
+
 Future<void> doPaste(EditorState editorState) async {
   final selection = editorState.selection;
   if (selection == null) {
@@ -119,7 +143,7 @@ Future<void> doPaste(EditorState editorState) async {
   }
 
   if (plainText != null && plainText.isNotEmpty) {
-    await editorState.pastePlainText(plainText);
+    await editorState.pasteText(plainText);
     return Log.info('Pasted plain text');
   }
 
@@ -190,3 +214,22 @@ Future<bool> _pasteAsLinkPreview(
 
   return true;
 }
+
+Future<void> doPlainPaste(EditorState editorState) async {
+  final selection = editorState.selection;
+  if (selection == null) {
+    return;
+  }
+
+  EditorNotification.paste().post();
+
+  // dispatch the paste event
+  final data = await getIt<ClipboardService>().getData();
+  final plainText = data.plainText;
+  if (plainText != null && plainText.isNotEmpty) {
+    await editorState.pastePlainText(plainText);
+    return Log.info('Pasted plain text');
+  }
+
+  return Log.info('unable to parse the clipboard content');
+}

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/copy_and_paste/paste_from_plain_text.dart

@@ -1,29 +1,18 @@
+import 'package:appflowy/shared/markdown_to_document.dart';
 import 'package:appflowy/shared/patterns/common_patterns.dart';
 import 'package:appflowy_editor/appflowy_editor.dart';
 
 extension PasteFromPlainText on EditorState {
   Future<void> pastePlainText(String plainText) async {
-    if (await pasteHtmlIfAvailable(plainText)) {
-      return;
-    }
-
     await deleteSelectionIfNeeded();
-
     final nodes = plainText
         .split('\n')
         .map(
           (e) => e
             ..replaceAll(r'\r', '')
             ..trimRight(),
         )
-        .map((e) {
-          // parse the url content
-          final Attributes attributes = {};
-          if (hrefRegex.hasMatch(e)) {
-            attributes[AppFlowyRichTextKeys.href] = e;
-          }
-          return Delta()..insert(e, attributes: attributes);
-        })
+        .map((e) => Delta()..insert(e))
         .map((e) => paragraphNode(delta: e))
         .toList();
     if (nodes.isEmpty) {
@@ -36,6 +25,24 @@ extension PasteFromPlainText on EditorState {
     }
   }
 
+  Future<void> pasteText(String plainText) async {
+    if (await pasteHtmlIfAvailable(plainText)) {
+      return;
+    }
+
+    await deleteSelectionIfNeeded();
+
+    final nodes = customMarkdownToDocument(plainText).root.children;
+    if (nodes.isEmpty) {
+      return;
+    }
+    if (nodes.length == 1) {
+      await pasteSingleLineNode(nodes.first);
+    } else {
+      await pasteMultiLineNodes(nodes.toList());
+    }
+  }
+
   Future<bool> pasteHtmlIfAvailable(String plainText) async {
     final selection = this.selection;
     if (selection == null ||

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/shortcuts/command_shortcuts.dart

@@ -30,6 +30,7 @@ List<CommandShortcutEvent> commandShortcutEvents = [
 
   customCopyCommand,
   customPasteCommand,
+  customPastePlainTextCommand,
   customCutCommand,
   customUndoCommand,
   customRedoCommand,
@@ -43,6 +44,7 @@ List<CommandShortcutEvent> commandShortcutEvents = [
         copyCommand,
         cutCommand,
         pasteCommand,
+        pasteTextWithoutFormattingCommand,
         toggleTodoListCommand,
         undoCommand,
         redoCommand,

frontend/resources/translations/en.json

@@ -1841,7 +1841,8 @@
       "contextMenu": {
         "copy": "Copy",
         "cut": "Cut",
-        "paste": "Paste"
+        "paste": "Paste",
+        "pasteAsPlainText": "Paste as plain text"
       },
       "action": "Actions",
       "database": {