It wouldn't save any time to see the Arc source, since it runs on their servers, and PG would have to check any fixes to see if they worked and didn't ruin everything, which would probably take more time than just doing it himself.

I'm all in favor of Arc being released, however, even informally and without any promises of updates.

It's a joke - I know we couldn't fix it, I just want to see the source. :)

Isn't it just 30 lines of elegant Lisp code? Write it yourself unless, of course you want the Holy Lispirit come onto you when looking at PG's code :)