require 'formula'

class Ruby18x < Requirement
  def message; <<-EOS.undent
    MacVim compiles against whatever Ruby it finds in your path, and has
    problems working with Ruby 1.9. We've detected Ruby 1.9 in your path,
    so this compile may fail.
    EOS
  end
  def fatal?
    false
  end
  def satisfied?
    `ruby --version` =~ /1\.8\.\d/
  end
end

class Macvim < Formula
  homepage 'http://code.google.com/p/macvim/'
  url 'https://github.com/b4winckler/macvim/tarball/snapshot-64'
  version '7.3-64'
  md5 '5bdc0bc618b3179130f846f8d0f81283'

  head 'https://github.com/b4winckler/macvim.git', :branch => 'master'

  def options
  [
    ["--custom-icons", "Try to generate custom document icons."],
    ["--with-cscope", "Build with Cscope support."],
    ["--override-system-vim", "Override system vim."],
    ["--with-lua", "Build with Lua scripting support."]
  ]
  end

  depends_on Ruby18x.new
  depends_on 'cscope' if ARGV.include? '--with-cscope'
  depends_on 'lua' if ARGV.include? '--with-lua'

  def install
    # MacVim's Xcode project gets confused by $CC, so remove it
    ENV['CC'] = nil
    ENV['CFLAGS'] = nil
    ENV['CXX'] = nil
    ENV['CXXFLAGS'] = nil

    # Set ARCHFLAGS so the Python app (with C extension) that is
    # used to create the custom icons will not try to compile in
    # PPC support (which isn't needed in Homebrew-supported systems.)
    arch = MacOS.prefer_64_bit? ? 'x86_64' : 'i386'
    ENV['ARCHFLAGS'] = "-arch #{arch}"

    args = ["--with-features=huge",
            "--with-tlib=ncurses",
            "--enable-multibyte",
            "--with-macarchs=#{arch}",
            "--enable-perlinterp",
            "--enable-pythoninterp",
            "--enable-rubyinterp",
            "--enable-tclinterp"]

    args << "--enable-cscope" if ARGV.include? "--with-cscope"

    if ARGV.include? "--with-lua"
      args << "--enable-luainterp"
      args << "--with-lua-prefix=#{HOMEBREW_PREFIX}"
    end

    system "./configure", *args

    # Building custom icons fails for many users, so off by default.
    unless ARGV.include? "--custom-icons"
      inreplace "src/MacVim/icons/Makefile", "$(MAKE) -C makeicns", ""
      inreplace "src/MacVim/icons/make_icons.py", "dont_create = False", "dont_create = True"
    end

    # Reference: https://github.com/b4winckler/macvim/wiki/building
    cd 'src/MacVim/icons' do
      system "make getenvy"
    end

    system "make"

    prefix.install "src/MacVim/build/Release/MacVim.app"
    inreplace "src/MacVim/mvim", /^# VIM_APP_DIR=\/Applications$/,
              "VIM_APP_DIR=#{prefix}"
    bin.install "src/MacVim/mvim"

    # Create MacVim vimdiff, view, ex equivalents
    executables = %w[mvimdiff mview mvimex]
    executables += %w[vi vim vimdiff view vimex] if ARGV.include? "--override-system-vim"
    executables.each {|f| ln_s bin+'mvim', bin+f}
  end

  def caveats; <<-EOS.undent
    MacVim.app installed to:
      #{prefix}

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