require 'formula' class ErlangInstalled < Requirement fatal true default_formula 'erlang' env :userpaths satisfy { erl = which('erl') and begin `#{erl} -noshell -eval 'io:fwrite("~s~n", [erlang:system_info(otp_release)]).' -s erlang halt | grep -q '^R1[6789]'` $?.exitstatus == 0 end } def message; <<-EOS.undent Erlang R16 is required to install. You can install this with: brew install erlang Or you can use an official installer from: http://www.erlang.org/ EOS end end class Elixir < Formula homepage 'http://elixir-lang.org/' url 'https://github.com/elixir-lang/elixir/archive/v0.11.2.tar.gz' sha1 '9c102acbcf7bb42454ed39d5d497add11f3cdc4d' head 'https://github.com/elixir-lang/elixir.git' depends_on ErlangInstalled def install system "make" bin.install Dir['bin/*'] - Dir['bin/*.bat'] Dir['lib/*/ebin'].each do |path| app = File.basename(File.dirname(path)) (lib/app).install path end end test do system "#{bin}/elixir", "-v" end end