mod_rpaf.rb

class ModRpaf < Formula
  class CLTRequirement < Requirement
    fatal true
    satisfy { MacOS.version < :mavericks || MacOS::CLT.installed? }

    def message; <<-EOS.undent
      Xcode Command Line Tools required, even if Xcode is installed, on OS X 10.9 or
      10.10 and not using Homebrew httpd22 or httpd24. Resolve by running
        xcode-select --install
      EOS
    end
  end

  desc "Sets env vars to the values provided by an upstream proxy."
  homepage "https://github.com/gnif/mod_rpaf"
  url "https://github.com/gnif/mod_rpaf/archive/v0.8.4.tar.gz"
  sha256 "b78f292d7336f839527d6fb2213116c995a525ad9aa38c344c485abbd76848f5"

  option "with-homebrew-httpd22", "Use Homebrew Apache httpd 2.2"
  option "with-homebrew-httpd24", "Use Homebrew Apache httpd 2.4"

  deprecated_option "with-brewed-httpd22" => "with-homebrew-httpd22"
  deprecated_option "with-brewed-httpd24" => "with-homebrew-httpd24"

  depends_on "httpd22" if build.with? "homebrew-httpd22"
  depends_on "httpd24" if build.with? "homebrew-httpd24"
  depends_on CLTRequirement if build.without?("homebrew-httpd22") && build.without?("homebrew-httpd24")

  if build.with?("homebrew-httpd22") && build.with?("homebrew-httpd24")
    onoe "Cannot build for http22 and httpd24 at the same time"
    exit 1
  end

  def apache_apxs
    if build.with? "homebrew-httpd22"
      %W[sbin bin].each do |dir|
        if File.exist?(location = "#{Formula["httpd22"].opt_prefix}/#{dir}/apxs")
          return location
        end
      end
    elsif build.with? "homebrew-httpd24"
      %W[sbin bin].each do |dir|
        if File.exist?(location = "#{Formula["httpd24"].opt_prefix}/#{dir}/apxs")
          return location
        end
      end
    else
      "/usr/sbin/apxs"
    end
  end

  def apache_configdir
    if build.with? "homebrew-httpd22"
      "#{etc}/apache2/2.2"
    elsif build.with? "homebrew-httpd24"
      "#{etc}/apache2/2.4"
    else
      "/etc/apache2"
    end
  end

  def install
    system "make"

    libexec.install ".libs/mod_rpaf.so"
  end

  def caveats; <<-EOS.undent
    You must manually edit #{apache_configdir}/httpd.conf to include
      LoadModule rpaf_module #{libexec}/mod_rpaf.so

    NOTE: If you're _NOT_ using --with-homebrew-httpd22 or --with-homebrew-httpd24 and having
    installation problems relating to a missing `cc` compiler and `OSX#{MacOS.version}.xctoolchain`,
    read the "Troubleshooting" section of https://github.com/Homebrew/homebrew-apache
    EOS
  end
end