Is there a way to automatically update/post to diaspora from google plus ?

At the moment there doesn’t seem to be a way to post directly to Diaspora other than using the “share button”: http://friends.murrur.fi/stuff/shareindiaspora.html

… and GPlus does not have a public API yet. You can get an RSS feed unofficially via this: http://macno.org/plus2atom/

Then reuse it via this: http://brdcst.it/

But still no support to post to Diaspora. I have requested brdcst.it to support Diaspora, perhaps the button code may help.