require 'extend/ENV'
require 'hardware'

module Homebrew extend self
  def __env
    ENV.activate_extensions!

    if superenv?
      ENV.deps = ARGV.formulae.map(&:name) unless ARGV.named.empty?
    end

    ENV.setup_build_environment
    ENV.universal_binary if ARGV.build_universal?
    if $stdout.tty?
      dump_build_env ENV
    else
      build_env_keys(ENV).each do |key|
        puts "export #{key}=\"#{ENV[key]}\""
      end
    end
  end

  def build_env_keys env
    %w[
      CC CXX LD OBJC OBJCXX
      HOMEBREW_CC HOMEBREW_CXX
      CFLAGS CXXFLAGS CPPFLAGS LDFLAGS SDKROOT MAKEFLAGS
      CMAKE_PREFIX_PATH CMAKE_INCLUDE_PATH CMAKE_LIBRARY_PATH CMAKE_FRAMEWORK_PATH
      MACOSX_DEPLOYMENT_TARGET PKG_CONFIG_PATH PKG_CONFIG_LIBDIR
      HOMEBREW_DEBUG HOMEBREW_MAKE_JOBS HOMEBREW_VERBOSE
      HOMEBREW_SVN HOMEBREW_GIT
      HOMEBREW_SDKROOT HOMEBREW_BUILD_FROM_SOURCE
      MAKE GIT CPP
      ACLOCAL_PATH PATH CPATH].select{ |key| env.fetch(key) if env.key? key }
  end

  def dump_build_env env
    build_env_keys(env).each do |key|
      next if superenv? and %w{CC CXX OBJC OBJCXX}.include? key

      value = env[key]
      print "#{key}: #{value}"
      case key
      when "CC", "CXX", "LD"
        print " => #{Pathname.new(value).realpath}" if File.symlink?(value)
      end
      puts
    end
  end
end