Add getPath helper

npm/install.js

@@ -22,16 +22,23 @@ function onerror (err) {
   throw err
 }
 
-var paths = {
-  darwin: 'dist/Electron.app/Contents/MacOS/Electron',
-  freebsd: 'dist/electron',
-  linux: 'dist/electron',
-  win32: 'dist/electron.exe'
+function getPath (platform) {
+  switch (platform) {
+    case 'darwin':
+      return 'dist/Electron.app/Contents/MacOS/Electron'
+    case 'freebsd':
+    case 'linux':
+      return 'dist/electron'
+    case 'win32':
+      return 'dist/electron.exe'
+    default:
+      throw new Error('Electron builds are not available on platform: ' + platform)
+  }
 }
 
-if (!paths[platform]) throw new Error('Electron builds are not available on platform: ' + platform)
+var platformPath = getPath(platform)
 
-if (installedVersion === version && fs.existsSync(path.join(__dirname, paths[platform]))) {
+if (installedVersion === version && fs.existsSync(path.join(__dirname, platformPath))) {
   process.exit(0)
 }
 
@@ -49,7 +56,7 @@ function extractFile (err, zipPath) {
   if (err) return onerror(err)
   extract(zipPath, {dir: path.join(__dirname, 'dist')}, function (err) {
     if (err) return onerror(err)
-    fs.writeFile(path.join(__dirname, 'path.txt'), paths[platform], function (err) {
+    fs.writeFile(path.join(__dirname, 'path.txt'), platformPath, function (err) {
       if (err) return onerror(err)
     })
   })