promisify cache update

Author: agnivade

.eslintrc.json

@@ -79,7 +79,8 @@
   },
   "env": {
     "node": true,
-    "mocha": true
+    "mocha": true,
+    "es6": true
   },
   "parserOptions": {
     "ecmaVersion": 6

lib/cache.js

@@ -36,19 +36,18 @@ exports.update = (done) => {
       return done(err);
     }
     // Creating cache folder
-    fs.mkdirs(CACHE_FOLDER, (err) => {
-      if (err) {
+    fs.ensureDir(CACHE_FOLDER)
+      .then(() => {
+        return fs.copy(tempFolder, CACHE_FOLDER);
+      })
+      .then(() => {
+        return index.rebuildPagesIndex();
+      })
+      .then(() => {
+        return done();
+      })
+      .catch((err) => {
         return done(err);
-      }
-      // Copying from tmp to cache folder
-      fs.copy(tempFolder, CACHE_FOLDER, (err) => {
-        if (err) {
-          return done(err);
-        }
-        index.rebuildPagesIndex(() => {
-          return done();
-        });
       });
-    });
   });
 };

lib/index.js

@@ -76,10 +76,13 @@ function clearRuntimeIndex() {
   shortIndex = null;
 }
 
-function rebuildPagesIndex(done) {
-  clearPagesIndex(() => {
-    getShortIndex(()=>{
-      return done();
+function rebuildPagesIndex() {
+  /*eslint no-unused-vars: ["error", { "args": "none" }]*/
+  return new Promise((resolve, reject) => {
+    clearPagesIndex(() => {
+      getShortIndex(() => {
+        resolve();
+      });
     });
   });
 }