mxcl/homebrew — pull request #14387 by staticfloat (2012-08-22 18:47:25+00:00)
Title: Implement ".brewing" support

This is a first attempt at closing #8555, and I would appreciate comments on the code quality as I am (as usual) learning more Ruby with each pull request to Homebrew.

I chose to stick the `.brewing` files into HOMEBREW_CACHE because a Formula's prefix is not created until the install step, and I didn't want to mess with that. I don't have any support for detecting an "incomplete" install or anything like that (As implied by adamv's 1st comment on the above issue), this is simply to stop two simultaneous installs.