make list completion more reusable

lib/markdown_formatter.dart

@@ -1,5 +1,8 @@
 import 'package:flutter/services.dart';
 
+const unorderedListTypes = ['*', '+', '-'];
+const orderedListTypes = [')', '.'];
+
 extension Utilities on String {
   int getBeginningOfTheLine(int from) {
     if (from <= 0) return 0;
@@ -80,11 +83,12 @@ class MarkdownFormatter extends TextInputFormatter {
         return tev.append('$indent$number$afterNumberChar ');
       }
 
-      newVal = unorderedListContinuation('-', newVal);
-      newVal = unorderedListContinuation('*', newVal);
-      newVal = unorderedListContinuation('+', newVal);
-      newVal = orderedListContinuation('.', newVal);
-      newVal = orderedListContinuation(')', newVal);
+      for (final c in unorderedListTypes) {
+        newVal = unorderedListContinuation(c, newVal);
+      }
+      for (final c in orderedListTypes) {
+        newVal = orderedListContinuation(c, newVal);
+      }
     }
 
     return newVal;

lib/widgets/editor/editor_toolbar.dart

@@ -224,12 +224,21 @@ class _ToolbarBody extends HookWidget {
           onPressed: () {
             final line = controller.firstSelectedLine;
 
-            if (line.startsWith('* ')) {
-              controller.removeAtBeginningOfEverySelectedLine('* ');
-            } else if (line.startsWith('- ')) {
-              controller.removeAtBeginningOfEverySelectedLine('- ');
-            } else {
-              controller.insertAtBeginningOfEverySelectedLine('- ');
+            // if theres a list in place, remove it
+            final listRemoved = () {
+              for (final c in unorderedListTypes) {
+                if (line.startsWith('$c ')) {
+                  controller.removeAtBeginningOfEverySelectedLine('$c ');
+                  return true;
+                }
+              }
+              return false;
+            }();
+
+            // if no list, then let's add one
+            if (!listRemoved) {
+              controller.insertAtBeginningOfEverySelectedLine(
+                  '${unorderedListTypes.last} ');
             }
           },
           icon: const Icon(Icons.format_list_bulleted),