relocate 'generateAddMarkdownSymbolCommand' method

packages/editor/src/client/services/use-codemirror-editor/utils/editor-shortcuts/generate-add-markdown-symbol-command.ts

@@ -0,0 +1,31 @@
+import type { Command } from '@codemirror/view';
+
+import type { InsertMarkdownElements } from '../insert-markdown-elements';
+import type { InsertPrefix } from '../insert-prefix';
+
+export const generateAddMarkdownSymbolCommand = (
+    insertMarkdown: InsertMarkdownElements | InsertPrefix,
+    prefix: string,
+    suffix?: string,
+): Command => {
+
+  const isInsertMarkdownElements = (
+      fn: InsertMarkdownElements | InsertPrefix,
+  ): fn is InsertMarkdownElements => {
+    return fn.length === 2;
+  };
+
+  const addMarkdownSymbolCommand: Command = () => {
+    if (isInsertMarkdownElements(insertMarkdown)) {
+      if (suffix == null) return false;
+      insertMarkdown(prefix, suffix);
+    }
+    else {
+      insertMarkdown(prefix);
+    }
+
+    return true;
+  };
+
+  return addMarkdownSymbolCommand;
+};