Add an "osxdesktop" module that implements functions in a new virtual

"desktop" virtual module, such as lock, screensaver, get_output_volume,
and set_output_volume

salt/modules/osxdesktop.py

@@ -0,0 +1,50 @@
+'''
+Mac OS X implementations of various commands in the "desktop" interface
+'''
+
+
+def __virtual__():
+    if __grains__['os'] == 'MacOS':
+        return 'desktop'
+
+
+def get_output_volume():
+    '''
+    Get the output volume (range 0 to 100)
+    '''
+
+    cmd = 'osascript -e "get output volume of (get volume settings)"'
+
+    return __salt__['cmd.run'](cmd)
+
+
+def set_output_volume(volume):
+    '''
+    Set the volume of sound (range 0 to 100)
+    '''
+
+    cmd = 'osascript -e "set volume output volume {0}"'.format(volume)
+
+    __salt__['cmd.run'](cmd)
+
+    return get_output_volume()
+
+
+def screensaver():
+    '''
+    Launch the screensaver
+    '''
+
+    cmd = 'open /System/Library/Frameworks/ScreenSaver.framework/Versions/A/Resources/ScreenSaverEngine.app'
+
+    return __salt__['cmd.run'](cmd)
+
+
+def lock():
+    '''
+    Lock the screen
+    '''
+
+    cmd = '/System/Library/CoreServices/Menu\ Extras/User.menu/Contents/Resources/CGSession -suspend'
+
+    return __salt__['cmd.run'](cmd)