리펙토링: Node.js 프로젝트 폴더 구조 적용

src/main/ipc/files.js

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+const { ipcMain } = require('electron');
+const path = require('path');
+const fs = require('fs');
+
+const EXTS = new Set(['.jpg', '.jpeg', '.png', '.gif', '.bmp', '.tiff', '.tif', '.webp', '.heic', '.heif']);
+
+function register() {
+  ipcMain.handle('list-images', async (_event, folderPath) => {
+    try {
+      const files = fs.readdirSync(folderPath)
+        .filter(f => EXTS.has(path.extname(f).toLowerCase()))
+        .map(f => {
+          const fullPath = path.join(folderPath, f);
+          const stat = fs.statSync(fullPath);
+          return { name: f, path: fullPath, mtime: stat.mtimeMs, size: stat.size };
+        })
+        .sort((a, b) => a.name.localeCompare(b.name, 'ko'));
+      return files;
+    } catch (e) {
+      return [];
+    }
+  });
+
+  ipcMain.handle('read-image', async (_event, filePath) => {
+    try {
+      const data = fs.readFileSync(filePath);
+      const ext = path.extname(filePath).toLowerCase().replace('.', '');
+      const mime = (ext === 'jpg' || ext === 'jpeg') ? 'jpeg'
+                 : ext === 'png'  ? 'png'
+                 : ext === 'gif'  ? 'gif'
+                 : ext === 'webp' ? 'webp'
+                 : 'jpeg';
+      return `data:image/${mime};base64,${data.toString('base64')}`;
+    } catch (e) {
+      return null;
+    }
+  });
+
+  ipcMain.handle('rename-files', async (_event, { folderPath, files, prefix, digits }) => {
+    const errors = [];
+    const pad = (n) => String(n + 1).padStart(digits, '0');
+
+    // 1단계: 임시 이름으로 이동 (충돌 방지)
+    const tmpMap = [];
+    for (let i = 0; i < files.length; i++) {
+      const src = files[i].path;
+      const ext = path.extname(files[i].name).toLowerCase();
+      const tmp = path.join(folderPath, `__tmp_rename_${i}_${Date.now()}${ext}`);
+      try {
+        fs.renameSync(src, tmp);
+        tmpMap.push({ tmp, ext, idx: i });
+      } catch (e) {
+        errors.push(`${files[i].name}: ${e.message}`);
+      }
+    }
+
+    // 2단계: 최종 이름으로 이동
+    const renamed = [];
+    for (const { tmp, ext, idx } of tmpMap) {
+      const newName = `${prefix}_${pad(idx)}${ext}`;
+      const dest = path.join(folderPath, newName);
+      try {
+        fs.renameSync(tmp, dest);
+        renamed.push({ oldPath: tmp, newPath: dest, newName });
+      } catch (e) {
+        errors.push(`${newName}: ${e.message}`);
+      }
+    }
+
+    return { renamed, errors };
+  });
+}
+
+module.exports = { register };

src/main/ipc/folder.js

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+const { ipcMain, dialog, shell } = require('electron');
+
+function register(mainWindow) {
+  ipcMain.handle('select-folder', async () => {
+    const result = await dialog.showOpenDialog(mainWindow, {
+      properties: ['openDirectory'],
+      title: '이미지 폴더 선택',
+    });
+    if (result.canceled) return null;
+    return result.filePaths[0];
+  });
+
+  ipcMain.handle('reveal-folder', async (_event, folderPath) => {
+    shell.openPath(folderPath);
+  });
+}
+
+module.exports = { register };

src/main/ipc/index.js

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+const folder = require('./folder');
+const files = require('./files');
+
+function registerAll(mainWindow) {
+  folder.register(mainWindow);
+  files.register();
+}
+
+module.exports = { registerAll };