initial idea

atom/browser/api/lib/auto-updater/auto-updater-win.coffee

@@ -0,0 +1,60 @@
+{EventEmitter} = require 'events'
+SquirrelUpdate = require './auto-updater/squirrel-update-win'
+
+class AutoUpdater
+  @__proto__ = EventEmitter.prototype
+
+  quitAndInstall: ->
+    # TODO
+
+  setFeedUrl: (@updateUrl) ->
+
+  checkForUpdates: ->
+    throw new Error('Update URL is not set') unless @updateUrl
+
+    @emit 'checking-for-update'
+
+    unless SquirrelUpdate.existsSync()
+      @emit 'update-not-available'
+      return
+
+    @downloadUpdate (error, update) =>
+      if error?
+        @emit 'update-not-available'
+        return
+
+      unless update?
+        @emit 'update-not-available'
+        return
+
+      @emit 'update-available'
+
+      @installUpdate (error) =>
+        if error?
+          @emit 'update-not-available'
+          return
+
+        @emit 'update-downloaded', {}, update.releaseNotes, update.version, new Date(), @updateUrl, => @quitAndInstall()
+
+  downloadUpdate: (callback) ->
+    SquirrelUpdate.spawn ['--download', @updateUrl], (error, stdout) ->
+      return callback(error) if error?
+
+      try
+        # Last line of output is the JSON details about the releases
+        json   = stdout.trim().split('\n').pop()
+        update = JSON.parse(json)?.releasesToApply?.pop?()
+      catch error
+        error.stdout = stdout
+        return callback(error)
+
+      callback(null, update)
+
+  installUpdate: (callback) ->
+    SquirrelUpdate.spawn(['--update', @updateUrl], callback)
+
+  supportsUpdates: ->
+    SquirrelUpdate.existsSync()
+
+
+module.exports = new AutoUpdater()