require "formula"

class Vim < Formula
  homepage "http://www.vim.org/"
  head "https://vim.googlecode.com/hg/"
  # This package tracks debian-unstable: http://packages.debian.org/unstable/vim
  url "http://ftp.debian.org/debian/pool/main/v/vim/vim_7.4.488.orig.tar.gz"
  sha1 "6edad8cf9a08acb6a6e415b89bb13ccbd887d7c3"

  # We only have special support for finding depends_on :python, but not yet for
  # :ruby, :perl etc., so we use the standard environment that leaves the
  # PATH as the user has set it right now.
  env :std

  option "override-system-vi", "Override system vi"
  option "disable-nls", "Build vim without National Language Support (translated messages, keymaps)"
  option "with-client-server", "Enable client/server mode"

  LANGUAGES_OPTIONAL = %w(lua mzscheme python3 tcl)
  LANGUAGES_DEFAULT  = %w(perl python ruby)

  option "with-python3", "Build vim with python3 instead of python[2] support"
  LANGUAGES_OPTIONAL.each do |language|
    option "with-#{language}", "Build vim with #{language} support"
  end
  LANGUAGES_DEFAULT.each do |language|
    option "without-#{language}", "Build vim without #{language} support"
  end

  depends_on :python => :recommended
  depends_on :python3 => :optional
  depends_on "lua" => :optional
  depends_on "luajit" => :optional
  depends_on "gtk+" if build.with? "client-server"

  conflicts_with "ex-vi",
    :because => "vim and ex-vi both install bin/ex and bin/view"

  def install
    ENV["LUA_PREFIX"] = HOMEBREW_PREFIX if build.with?("lua") || build.with?("luajit")

    # vim doesn't require any Python package, unset PYTHONPATH.
    ENV.delete("PYTHONPATH")

    opts = []
    opts += LANGUAGES_OPTIONAL.map do |language|
      "--enable-#{language}interp" if build.with? language
    end
    opts += LANGUAGES_DEFAULT.map do |language|
      "--enable-#{language}interp" if build.with? language
    end
    if opts.include? "--enable-pythoninterp" and opts.include? "--enable-python3interp"
      # only compile with either python or python3 support, but not both
      # (if vim74 is compiled with +python3/dyn, the Python[3] library lookup segfaults
      # in other words, a command like ":py3 import sys" leads to a SEGV)
      opts = opts - %W[--enable-pythoninterp]
    end

    opts << "--disable-nls" if build.include? "disable-nls"

    if build.with? "client-server"
      opts << "--enable-gui=gtk2"
    else
      opts << "--enable-gui=no"
      opts << "--without-x"
    end

    if build.with? "luajit"
      opts << "--with-luajit"
      opts << "--enable-luainterp"
    end

    # XXX: Please do not submit a pull request that hardcodes the path
    # to ruby: vim can be compiled against 1.8.x or 1.9.3-p385 and up.
    # If you have problems with vim because of ruby, ensure a compatible
    # version is first in your PATH when building vim.

    # We specify HOMEBREW_PREFIX as the prefix to make vim look in the
    # the right place (HOMEBREW_PREFIX/share/vim/{vimrc,vimfiles}) for
    # system vimscript files. We specify the normal installation prefix
    # when calling "make install".
    system "./configure", "--prefix=#{HOMEBREW_PREFIX}",
                          "--mandir=#{man}",
                          "--enable-multibyte",
                          "--with-tlib=ncurses",
                          "--enable-cscope",
                          "--with-features=huge",
                          "--with-compiledby=Homebrew",
                          *opts

    system "make"
    # If stripping the binaries is not enabled, vim will segfault with
    # statically-linked interpreters like ruby
    # http://code.google.com/p/vim/issues/detail?id=114&thanks=114&ts=1361483471
    system "make", "install", "prefix=#{prefix}", "STRIP=true"
    bin.install_symlink "vim" => "vi" if build.include? "override-system-vi"
  end

  test do
    # Simple test to check if Vim was linked to Python version in $PATH
    if build.with? "python"
      vim_path = bin/"vim"

      # Get linked framework using otool
      otool_output = `otool -L #{vim_path} | grep -m 1 Python`.gsub(/\(.*\)/, "").strip.chomp

      # Expand the link and get the python exec path
      vim_framework_path = Pathname.new(otool_output).realpath.dirname.to_s.chomp
      system_framework_path = `python-config --exec-prefix`.chomp

      assert_equal system_framework_path, vim_framework_path
    end
  end
end