brew install ./zaw.rb --HEAD

zaw.rb

require 'formula'

class Zaw < Formula
  homepage 'https://github.com/zsh-users/zaw'

  head 'https://github.com/zsh-users/zaw.git'

  def install
    (share/'zaw').install Dir['*']
  end

  def caveats
    <<-EOS.undent
    To activate this widget, add the following at the end of your .zshrc:

      source #{HOMEBREW_PREFIX}/share/zaw/zaw.zsh

    You will also need to force reload of your .zshrc:

      source ~/.zshrc
    EOS
  end
end