Allow using png to build for OSX if OS is OSX

package.json

@@ -18,7 +18,7 @@
     "clean": "gulp clean",
     "build": "gulp build",
     "watch": "while true ; do gulp watch ; done",
-    "package-placeholder": "npm run build && node lib/cli.js http://www.bennish.net/web-notifications.html ~/Desktop --overwrite --app-name notification-test && open ~/Desktop/notification-test-darwin-x64/notification-test.app",
+    "package-placeholder": "npm run build && node lib/cli.js http://www.bennish.net/web-notifications.html ~/Desktop --overwrite --app-name notification-test --icon ./test-resources/iconSampleGrey.png && open ~/Desktop/notification-test-darwin-x64/notification-test.app",
     "start-placeholder": "npm run build && electron app",
     "release": "gulp release"
   },

src/buildApp.js

@@ -3,6 +3,8 @@ import path from 'path';
 import crypto from 'crypto';
 
 import optionsFactory from './options';
+import pngToIcns from './getIcon';
+import helpers from './helpers';
 import packager from 'electron-packager';
 import tmp from 'tmp';
 import ncp from 'ncp';
@@ -12,6 +14,7 @@ import _ from 'lodash';
 import packageJson from './../package.json';
 
 const copy = ncp.ncp;
+const isOSX = helpers.isOSX;
 
 /**
  * @callback buildAppCallback
@@ -56,6 +59,17 @@ function buildApp(options, callback) {
                 callback(error, tempDirPath, options);
             });
         },
+        (tempDir, options, callback) => {
+            if (options.platform !== 'darwin' || !isOSX()) {
+                callback(null, tempDir, options);
+                return;
+            }
+
+            pngToIcns(options.icon, (error, icnsPath) => {
+                options.icon = icnsPath;
+                callback(error, tempDir, options);
+            });
+        },
         (tempDir, options, callback) => {
             options.dir = tempDir;
             packager(options, (error, appPathArray) => {
@@ -84,7 +98,6 @@ function buildApp(options, callback) {
             }
 
             if (options.platform === 'darwin') {
-                // todo mac icon copy
                 callback(null, appPath);
                 return;
             }

src/helpers.js

@@ -0,0 +1,9 @@
+import os from 'os';
+
+function isOSX() {
+    return os.platform() === 'darwin';
+}
+
+export default {
+    isOSX: isOSX
+};