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;
@@ -43,101 +45,104 @@ 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";
-    }
-  };
+  const editorActions = {
+    getEditor: () => {
+      return editorRef.current;
+    },
+    focus: () => {
+      editorRef.current?.focus();
+    },
+    scrollToCursor: () => {
+      if (editorRef.current) {
+        editorRef.current.scrollTop = editorRef.current.scrollHeight;
+      }
+    },
+    insertText: (content = "", prefix = "", suffix = "") => {
+      if (!editorRef.current) {
+        return;
+      }
 
-  useImperativeHandle(
-    ref,
-    () => ({
-      focus: () => {
-        editorRef.current?.focus();
-      },
-      scrollToCursor: () => {
-        if (editorRef.current) {
-          editorRef.current.scrollTop = editorRef.current.scrollHeight;
-        }
-      },
-      insertText: (content = "", prefix = "", suffix = "") => {
-        if (!editorRef.current) {
-          return;
-        }
+      const cursorPosition = editorRef.current.selectionStart;
+      const endPosition = editorRef.current.selectionEnd;
+      const prevValue = editorRef.current.value;
+      const value =
+        prevValue.slice(0, cursorPosition) +
+        prefix +
+        (content || prevValue.slice(cursorPosition, endPosition)) +
+        suffix +
+        prevValue.slice(endPosition);
 
-        const cursorPosition = editorRef.current.selectionStart;
-        const endPosition = editorRef.current.selectionEnd;
-        const prevValue = editorRef.current.value;
-        const value =
-          prevValue.slice(0, cursorPosition) +
-          prefix +
-          (content || prevValue.slice(cursorPosition, endPosition)) +
-          suffix +
-          prevValue.slice(endPosition);
+      editorRef.current.value = value;
+      editorRef.current.focus();
+      editorRef.current.selectionEnd = endPosition + prefix.length + content.length;
+      handleContentChangeCallback(editorRef.current.value);
+      updateEditorHeight();
+    },
+    removeText: (start: number, length: number) => {
+      if (!editorRef.current) {
+        return;
+      }
 
-        editorRef.current.value = value;
-        editorRef.current.focus();
-        editorRef.current.selectionEnd = endPosition + prefix.length + content.length;
+      const prevValue = editorRef.current.value;
+      const value = prevValue.slice(0, start) + prevValue.slice(start + length);
+      editorRef.current.value = value;
+      editorRef.current.focus();
+      editorRef.current.selectionEnd = start;
+      handleContentChangeCallback(editorRef.current.value);
+      updateEditorHeight();
+    },
+    setContent: (text: string) => {
+      if (editorRef.current) {
+        editorRef.current.value = text;
         handleContentChangeCallback(editorRef.current.value);
         updateEditorHeight();
-      },
-      removeText: (start: number, length: number) => {
-        if (!editorRef.current) {
-          return;
-        }
-
-        const prevValue = editorRef.current.value;
-        const value = prevValue.slice(0, start) + prevValue.slice(start + length);
-        editorRef.current.value = value;
+      }
+    },
+    getContent: (): string => {
+      return editorRef.current?.value ?? "";
+    },
+    getCursorPosition: (): number => {
+      return editorRef.current?.selectionStart ?? 0;
+    },
+    getSelectedContent: () => {
+      const start = editorRef.current?.selectionStart;
+      const end = editorRef.current?.selectionEnd;
+      return editorRef.current?.value.slice(start, end) ?? "";
+    },
+    setCursorPosition: (startPos: number, endPos?: number) => {
+      const _endPos = isNaN(endPos as number) ? startPos : (endPos as number);
+      editorRef.current?.setSelectionRange(startPos, _endPos);
+    },
+    getCursorLineNumber: () => {
+      const cursorPosition = editorRef.current?.selectionStart ?? 0;
+      const lines = editorRef.current?.value.slice(0, cursorPosition).split("\n") ?? [];
+      return lines.length - 1;
+    },
+    getLine: (lineNumber: number) => {
+      return editorRef.current?.value.split("\n")[lineNumber] ?? "";
+    },
+    setLine: (lineNumber: number, text: string) => {
+      const lines = editorRef.current?.value.split("\n") ?? [];
+      lines[lineNumber] = text;
+      if (editorRef.current) {
+        editorRef.current.value = lines.join("\n");
         editorRef.current.focus();
-        editorRef.current.selectionEnd = start;
         handleContentChangeCallback(editorRef.current.value);
         updateEditorHeight();
-      },
-      setContent: (text: string) => {
-        if (editorRef.current) {
-          editorRef.current.value = text;
-          handleContentChangeCallback(editorRef.current.value);
-          updateEditorHeight();
-        }
-      },
-      getContent: (): string => {
-        return editorRef.current?.value ?? "";
-      },
-      getCursorPosition: (): number => {
-        return editorRef.current?.selectionStart ?? 0;
-      },
-      getSelectedContent: () => {
-        const start = editorRef.current?.selectionStart;
-        const end = editorRef.current?.selectionEnd;
-        return editorRef.current?.value.slice(start, end) ?? "";
-      },
-      setCursorPosition: (startPos: number, endPos?: number) => {
-        const _endPos = isNaN(endPos as number) ? startPos : (endPos as number);
-        editorRef.current?.setSelectionRange(startPos, _endPos);
-      },
-      getCursorLineNumber: () => {
-        const cursorPosition = editorRef.current?.selectionStart ?? 0;
-        const lines = editorRef.current?.value.slice(0, cursorPosition).split("\n") ?? [];
-        return lines.length - 1;
-      },
-      getLine: (lineNumber: number) => {
-        return editorRef.current?.value.split("\n")[lineNumber] ?? "";
-      },
-      setLine: (lineNumber: number, text: string) => {
-        const lines = editorRef.current?.value.split("\n") ?? [];
-        lines[lineNumber] = text;
-        if (editorRef.current) {
-          editorRef.current.value = lines.join("\n");
-          editorRef.current.focus();
-          handleContentChangeCallback(editorRef.current.value);
-          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;