사이드바에 트리 구조 폴더 기능 추가

src/main/ipc/folder.js

@@ -1,4 +1,16 @@
-const { ipcMain, dialog } = require('electron');
+const { ipcMain, dialog, app, shell } = require('electron');
+const path = require('path');
+const fs = require('fs');
+const os = require('os');
+
+const configPath = path.join(app.getPath('userData'), 'config.json');
+
+function readConfig() {
+  try { return JSON.parse(fs.readFileSync(configPath, 'utf8')); } catch { return {}; }
+}
+function writeConfig(data) {
+  try { fs.writeFileSync(configPath, JSON.stringify(data, null, 2)); } catch {}
+}
 
 function register(mainWindow) {
   ipcMain.handle('select-folder', async () => {
@@ -10,6 +22,41 @@ function register(mainWindow) {
     return result.filePaths[0];
   });
 
+  ipcMain.handle('get-home-dir', () => os.homedir());
+
+  ipcMain.handle('get-last-folder', () => {
+    const cfg = readConfig();
+    if (cfg.lastFolder) {
+      try { fs.accessSync(cfg.lastFolder); return cfg.lastFolder; } catch {}
+    }
+    return null;
+  });
+
+  ipcMain.handle('set-last-folder', (_e, folderPath) => {
+    const cfg = readConfig();
+    cfg.lastFolder = folderPath;
+    writeConfig(cfg);
+  });
+
+  ipcMain.handle('list-directories', (_e, folderPath) => {
+    try {
+      const entries = fs.readdirSync(folderPath, { withFileTypes: true });
+      return entries
+        .filter(e => e.isDirectory() && !e.name.startsWith('.'))
+        .map(e => {
+          const fullPath = path.join(folderPath, e.name);
+          let hasChildren = false;
+          try {
+            hasChildren = fs.readdirSync(fullPath, { withFileTypes: true })
+              .some(c => c.isDirectory() && !c.name.startsWith('.'));
+          } catch {}
+          return { name: e.name, path: fullPath, hasChildren };
+        })
+        .sort((a, b) => a.name.localeCompare(b.name));
+    } catch { return []; }
+  });
+
+  ipcMain.handle('reveal-folder', (_e, folderPath) => shell.openPath(folderPath));
 }
 
 module.exports = { register };