require 'formula'

class Emacs < Formula
  url 'http://ftpmirror.gnu.org/emacs/emacs-23.3b.tar.bz2'
  md5 '917ce0054ef63773078a6e99b55df1ee'
  homepage 'http://www.gnu.org/software/emacs/'
  head 'bzr://http://bzr.savannah.gnu.org/r/emacs/trunk'

  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"]

  def options
    [
      ["--cocoa", "Build a Cocoa version of emacs"],
      ["--srgb", "Enable sRGB colors in the Cocoa version of emacs"],
      ["--with-x", "Include X11 support"],
    ]
  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"

      unless ARGV.build_head?
        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
      end
    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 = ""
    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
    return s
  end
end