This is mostly for personal use, but feel free to fork.
Inspired by Paul Irish dotfiles
More about dotfiles at http://dotfiles.github.io/
brew bundle dump --file=~/Downloads/Brewfile
import os; [(os.path.dirname(file)[len('Packages/'):], sublime.decode_value(sublime.load_resource(file))['url']) for file in sublime.find_resources('package-metadata.json')]