require 'formula'

class Emacs < Formula
  url 'http://ftpmirror.gnu.org/emacs/emacs-23.3a.tar.bz2'
  md5 'f2cf8dc6f28f8ae59bc695b4ddda339c'
  homepage 'http://www.gnu.org/software/emacs/'

  fails_with_llvm "Duplicate symbol errors while linking.", :build => 2334

  # Stripping on Xcode 4 causes malformed object errors
  skip_clean ["bin/emacs", "bin/emacs-23.3", "bin/emacs-24.0.50"]

  if ARGV.include? "--use-git-head"
    head 'git://repo.or.cz/emacs.git'
  else
    head 'bzr://http://bzr.savannah.gnu.org/r/emacs/trunk'
  end

  def options
    [
      ["--cocoa", "Build a Cocoa version of emacs"],
      ["--srgb", "Enable sRGB colors in the Cocoa version of emacs"],
      ["--with-x", "Include X11 support"],
      ["--use-git-head", "Use repo.or.cz git mirror for HEAD builds"],
    ]
  end

  def patches
    p = []

    # Fix for building with Xcode 4; harmless on Xcode 3.x.
    unless ARGV.build_head?
      p << "http://repo.or.cz/w/emacs.git/commitdiff_plain/c8bba48c5889c4773c62a10f7c3d4383881f11c1"
      # Fix for address randomization on Darwin. Based on:
      #   http://repo.or.cz/w/emacs.git/patch/f2cea124dffac9ca4b8ce1dbb9b746f8e81109a3
      p << "https://raw.github.com/gist/1098107"
      # Fix for the titlebar issue on Mac OS X 10.7
      p << "https://raw.github.com/gist/1102744"
      # Fix for Shift key for IME users
      p << "https://raw.github.com/gist/1212776"
    end

    if ARGV.include? "--cocoa"
      # Fullscreen patch, works against 23.3 and HEAD.
      p << "https://raw.github.com/gist/1012927"
    end

    return p
  end

  def install
    args = ["--prefix=#{prefix}",
            "--without-dbus",
            "--enable-locallisppath=#{HOMEBREW_PREFIX}/share/emacs/site-lisp",
            "--infodir=#{info}/emacs"]

    if ARGV.build_head? and File.exists? "./autogen/copy_autogen"
      opoo "Using copy_autogen"
      puts "See https://github.com/mxcl/homebrew/issues/4852"
      system "autogen/copy_autogen"
    end

    if ARGV.include? "--cocoa"
      # Patch for color issues described here:
      # http://debbugs.gnu.org/cgi/bugreport.cgi?bug=8402
      if ARGV.include? "--srgb"
        inreplace "src/nsterm.m",
          "*col = [NSColor colorWithCalibratedRed: r green: g blue: b alpha: 1.0];",
          "*col = [NSColor colorWithDeviceRed: r green: g blue: b alpha: 1.0];"
      end

      args << "--with-ns" << "--disable-ns-self-contained"
      system "./configure", *args
      system "make bootstrap"
      system "make install"
      prefix.install "nextstep/Emacs.app"

      bin.mkpath
      ln_s prefix+'Emacs.app/Contents/MacOS/Emacs', bin+'emacs'
      ln_s prefix+'Emacs.app/Contents/MacOS/bin/emacsclient', bin
      ln_s prefix+'Emacs.app/Contents/MacOS/bin/etags', bin
    else
      if ARGV.include? "--with-x"
        ENV.x11
        args << "--with-x"
        args << "--with-gif=no" << "--with-tiff=no" << "--with-jpeg=no"
      else
        args << "--without-x"
      end

      system "./configure", *args
      system "make"
      system "make install"
    end
  end

  def caveats
    s = "For build options see:\n  brew options emacs\n\n"
    if ARGV.include? "--cocoa"
      s += <<-EOS.undent
        Emacs.app was installed to:
          #{prefix}

        Command-line emacs can be used by setting up an alias:
          alias emacs="#{prefix}/Emacs.app/Contents/MacOS/Emacs -nw"

         To link the application to a normal Mac OS X location:
           brew linkapps
         or:
           ln -s #{prefix}/Emacs.app /Applications
      EOS
    end

    s += <<-EOS.undent
      Because the official bazaar repository might be slow, we include an option for
      pulling HEAD from an unofficial Git mirror:

        brew install emacs --HEAD --use-git-head

      There is inevitably some lag between checkins made to the official Emacs bazaar
      repository and their appearance on the repo.or.cz mirror. See
      http://repo.or.cz/w/emacs.git for the mirror's status. The Emacs devs do not
      provide support for the git mirror, and they might reject bug reports filed
      with git version information. Use it at your own risk.
    EOS

    return s
  end
end