add overwrite option to helper.save

Author: JPeer264

README.md

@@ -27,7 +27,11 @@
 
 > Saves a file into any path
 
-**rcs.helper.save(destinationPath, data, cb)**
+**rcs.helper.save(destinationPath, data[, options] cb)**
+
+Options:
+
+- overwrite (Boolean): If it should overwrite an existing file. Default `false`.
 
 Example:
 

lib/options/helper.js

@@ -20,15 +20,27 @@ const helper = module.exports = {};
  *
  * @return {Function} cb
  */
-helper.save = (destinationPath, data, cb) => {
+helper.save = (destinationPath, data, options, cb) => {
     // @todo check if the filepath has an .ext
     // @todo check if the new filename is the same .ext
-    // @todo do not overwrite file! use for that an flag
+
+    // set cb if options are not set
+    if (typeof cb !== 'function') {
+        cb      = options;
+        options = {};
+    }
+
+    if (!options.overwrite && fs.existsSync(destinationPath)) {
+        return cb({
+            message: 'File exist and cannot be overwritten. Set the option overwrite to true to overwrite files.'
+        });
+    }
+
     fs.mkdirs(path.dirname(destinationPath), (err) => {
         fs.writeFile(destinationPath, data, (err, data) => {
             if (err) return cb(err);
 
-            return cb(null, "Successfully wrote " + destinationPath);
+            return cb(null, `Successfully wrote ${ destinationPath }`);
         });
     });
 }; // /save

test/helper.spec.js

@@ -26,6 +26,18 @@ describe('helper.js', () => {
         });
     });
 
+    it('should not overwrite the same file', done => {
+        const filePath = path.join(testCwd, '/../config.json');
+        const oldFile = fs.readFileSync(filePath, 'utf8');
+
+        rcs.helper.save(filePath, 'test content', err => {
+            expect(err.message).to.equal('File exist and cannot be overwritten. Set the option overwrite to true to overwrite files.');
+            expect(fs.readFileSync(filePath, 'utf8')).to.equal(oldFile);
+
+            done();
+        });
+    });
+
     it('should generatea readable json string from a json object', done => {
         const object = { a: 1, b:2, c:3 };
         const jsonString = rcs.helper.objectToJson(object);