require 'formula'

class Exim < Formula
  url 'http://ftp.exim.org/pub/exim/exim4/exim-4.72.tar.gz'
  homepage 'http://exim.org'
  sha1 '261c02c95b4d3aada73840b01f836e6874841c44'

  depends_on 'pcre'

  def install
    cp 'src/EDITME', 'Local/Makefile'
    inreplace 'Local/Makefile' do |s|
      s.remove_make_var! "EXIM_MONITOR"
      s.change_make_var! "EXIM_USER", ENV['USER']
      s.change_make_var! "SYSTEM_ALIASES_FILE", etc+'aliases'
      s.gsub! '/usr/exim/configure', etc+'exim.conf'
      s.gsub! '/usr/exim', prefix
      s.gsub! '/var/spool/exim', var+'spool/exim'

      # For non-/usr/local HOMEBREW_PREFIX
      s << "LOOKUP_INCLUDE=-I#{HOMEBREW_PREFIX}/include\n"
      s << "LOOKUP_LIBS=-L#{HOMEBREW_PREFIX}/lib\n"
   end

    inreplace 'OS/Makefile-Darwin' do |s|
      s.remove_make_var! %w{CC CFLAGS}
    end

    # The compile script ignores CPPFLAGS
    ENV.append "CFLAGS", ENV['CPPFLAGS']

    system "make"
    system "make INSTALL_ARG=-no_chown install"
    (man8).install 'doc/exim.8'
    (bin+'exim_ctl').write startup_script
  end

  # Inspired by MacPorts startup script. Fixes restart issue due to missing setuid.
  def startup_script
    return <<-END
#!/bin/sh
PID=#{var}/spool/exim/exim-daemon.pid
case "$1" in
start)
  echo "starting exim mail transfer agent"
  #{bin}/exim -bd -q30m
  ;;
restart)
  echo "restarting exim mail transfer agent"
  /bin/kill -15 `/bin/cat $PID` && sleep 1 && #{bin}/exim -bd -q30m
  ;;
stop)
  echo "stopping exim mail transfer agent"
  /bin/kill -15 `/bin/cat $PID`
  ;;
*)
  echo "Usage: #{bin}/exim_ctl {start|stop|restart}"
  exit 1
  ;;
esac
END
  end

  def caveats; <<-EOS.undent
    Start with:
      exim_ctl start
    Don't forget to run it as root to be able to bind port 25.
    EOS
  end
end