feat: impl list syntax auto complete to editor

web/src/components/MemoEditor/Editor/index.tsx

 import classNames from "classnames";
 import { forwardRef, ReactNode, useCallback, useEffect, useImperativeHandle, useRef } from "react";
+import { useAutoComplete } from "../hooks";
 import TagSuggestions from "./TagSuggestions";
 
 export interface EditorRefActions {
+  getEditor: () => HTMLTextAreaElement | null;
   focus: FunctionType;
   scrollToCursor: FunctionType;
   insertText: (text: string, prefix?: string, suffix?: string) => void;
@@ -43,16 +45,10 @@ const Editor = forwardRef(function Editor(props: Props, ref: React.ForwardedRef<
     }
   }, [editorRef.current?.value]);
 
-  const updateEditorHeight = () => {
-    if (editorRef.current) {
-      editorRef.current.style.height = "auto";
-      editorRef.current.style.height = (editorRef.current.scrollHeight ?? 0) + "px";
-    }
-  };
-
-  useImperativeHandle(
-    ref,
-    () => ({
+  const editorActions = {
+    getEditor: () => {
+      return editorRef.current;
+    },
     focus: () => {
       editorRef.current?.focus();
     },
@@ -135,9 +131,18 @@ const Editor = forwardRef(function Editor(props: Props, ref: React.ForwardedRef<
         updateEditorHeight();
       }
     },
-    }),
-    [],
-  );
+  };
+
+  useAutoComplete(editorActions);
+
+  useImperativeHandle(ref, () => editorActions, []);
+
+  const updateEditorHeight = () => {
+    if (editorRef.current) {
+      editorRef.current.style.height = "auto";
+      editorRef.current.style.height = (editorRef.current.scrollHeight ?? 0) + "px";
+    }
+  };
 
   const handleEditorInput = useCallback(() => {
     handleContentChangeCallback(editorRef.current?.value ?? "");

web/src/components/MemoEditor/hooks/index.ts

+import useAutoComplete from "./useAutoComplete";
+
+export { useAutoComplete };

web/src/components/MemoEditor/hooks/useAutoComplete.ts

+import { last } from "lodash-es";
+import { useEffect } from "react";
+import { NodeType, OrderedListNode, TaskListNode, UnorderedListNode } from "@/types/node";
+import { EditorRefActions } from "../Editor";
+
+const useAutoComplete = (actions: EditorRefActions) => {
+  useEffect(() => {
+    const editor = actions.getEditor();
+    if (!editor) return;
+
+    editor.addEventListener("keydown", (event) => {
+      if (event.key === "Enter") {
+        const cursorPosition = actions.getCursorPosition();
+        const prevContent = actions.getContent().substring(0, cursorPosition);
+        const lastNode = last(window.parse(prevContent));
+        if (!lastNode) {
+          return;
+        }
+
+        let insertText = "";
+        if (lastNode.type === NodeType.TASK_LIST) {
+          const { complete } = lastNode.value as TaskListNode;
+          insertText = complete ? "- [x] " : "- [ ] ";
+        } else if (lastNode.type === NodeType.UNORDERED_LIST) {
+          const { symbol } = lastNode.value as UnorderedListNode;
+          insertText = `${symbol} `;
+        } else if (lastNode.type === NodeType.ORDERED_LIST) {
+          const { number } = lastNode.value as OrderedListNode;
+          insertText = `${Number(number) + 1}. `;
+        }
+        if (insertText) {
+          actions.insertText(`\n${insertText}`);
+          event.preventDefault();
+        }
+      }
+    });
+  }, []);
+};
+
+export default useAutoComplete;