#!/usr/bin/env ruby
# vim: filetype=ruby:expandtab:shiftwidth=2:tabstop=8:softtabstop=2 :

$LOAD_PATH.unshift(File.dirname(__FILE__))

require 'English'
require 'mkmf'
require 'pkg-config'
require 'fileutils'

# from mkmf-gnome2.rb
STDOUT.print("checking for GCC... ")
STDOUT.flush
if macro_defined?("__GNUC__", "")
  STDOUT.print "yes\n"
  $CFLAGS += ' -Wall'
  $cc_is_gcc = true
else
  STDOUT.print "no\n"
  $cc_is_gcc = false
end

def check_win32
  checking_for("Win32 OS") do
    win32_os = /cygwin|mingw|mswin32/ =~ RUBY_PLATFORM
    if win32_os
      $defs << "-DRUBY_CAIRO_PLATFORM_WIN32"
      if $cc_is_gcc
        if /^2\./ =~ `#{Config::CONFIG['CC']} -dumpversion`.chomp
          $CFLAGS += ' -fnative-struct'
        else
          $CFLAGS += ' -mms-bitfields'
        end
      end
    end
    win32_os
  end
end

def set_output_lib(target_name, directory=nil)
  case RUBY_PLATFORM
  when /cygwin|mingw/
    filename = File.join(*([directory, "libruby-#{target_name}.a"].compact))
    if RUBY_VERSION > "1.8.0"
      $DLDFLAGS << ",--out-implib=#{filename}"
    elsif RUBY_VERSION > "1.8"
      $DLDFLAGS.gsub!(/ -Wl,--out-implib=[^ ]+/, '')
      $DLDFLAGS << " -Wl,--out-implib=#{filename}"
    else
      $DLDFLAGS.gsub!(/ --output-lib\s+[^ ]+/, '')
      $DLDFLAGS << " --output-lib #{filename}"
    end
    $cleanfiles << filename
  when /mswin32/
    $DLDFLAGS.gsub!(/ --output-lib\s+[^ ]+/, '')
    $DLDFLAGS.gsub!(/ \/IMPLIB:[^ ]+/, '')
    $DLDFLAGS << " /IMPLIB:$(IMPLIB)"
  when /darwin/
    if have_macro("CAIRO_HAS_QUARTZ_SURFACE", ["cairo.h"])
      checking_for("RubyCocoa") do
        begin
          require 'osx/cocoa'
          $defs << "-DHAVE_RUBY_COCOA"
          $DLDFLAGS << " -Wl,-framework,RubyCocoa"
          true
        rescue LoadError
          false
        end
      end
    end
  end
end


pkg = "cairo"
modname = "cairo"
ext_dir_name = "src"
srcdir = File.join(File.expand_path(File.dirname(__FILE__)), ext_dir_name)
major, minor, micro = 1, 2, 0

PKGConfig.have_package(pkg, major, minor, micro) or exit 1

have_header("ruby/st.h") unless have_macro("HAVE_RUBY_ST_H", "ruby.h")
have_header("ruby/io.h") unless have_macro("HAVE_RUBY_IO_H", "ruby.h")
have_func("rb_errinfo", "ruby.h")
have_type("enum ruby_value_type", "ruby.h")

check_win32
target_name = File.basename(modname)
set_output_lib(target_name, ext_dir_name)
$defs << "-DRB_CAIRO_COMPILATION"
create_makefile(modname, srcdir)

wine = with_config("wine", false)

makefile = File.read("Makefile")
File.open("Makefile", "w") do |f|
  objs = []
  co = nil
  makefile.each_line do |line|
    if wine
      line.gsub!(/\s+gcc\b/, " i586-mingw32msvc-gcc")
      line.gsub!(/C:/, "$(HOME)/.wine/drive_c")
      line.gsub!(/Z:/, "")
    end

    case line
    when /^DLLIB\s*=\s*/
      dllib = $POSTMATCH
      f.puts("DLLIB = #{ext_dir_name}/#{dllib}")
      f.puts("IMPLIB = #{ext_dir_name}/libruby-#{dllib.gsub(/\..+?$/, '.lib')}")
    when /^(SRCS)\s*=\s*/
      name = $1
      vars = $POSTMATCH.split.collect {|var| "$(srcdir)/#{var}"}.join(" ")
      f.puts("#{name} = #{vars}")
    when /^(OBJS|CLEANLIBS|CLEANOBJS)\s*=\s*/
      name = $1
      vars = $POSTMATCH.split.collect {|var| "#{ext_dir_name}/#{var}"}
      objs = vars if name == "OBJS"
      vars = vars.join(" ")
      f.puts("#{name} = #{vars}")
    when /^LDSHARED\s*=/
      def_file = "#{ext_dir_name}/#{target_name}.def"
      line.gsub!(/\b-shared\b/, "-shared #{def_file}") if wine
      f.puts(line)
    when /^\t\$\(CC\)/
      if PKGConfig.msvc?
        output_option = "-Fo"
      else
        output_option = "-o"
      end
      unless /#{Regexp.escape(output_option)}/ =~ line
        line = "#{line.chomp} #{output_option}$@"
      end
      co = line
      f.puts(line)
    else
      f.puts(line)
    end
  end

  if co and !objs.empty?
    f.puts
    if PKGConfig.msvc?
      f.puts "{$(srcdir)}.c{#{ext_dir_name}}.obj:"
      f.puts co
    else
      objs.each do |obj|
        f.puts "#{obj}: $(srcdir)/#{File.basename(obj).sub(/\..+?$/, '.c')}"
        f.puts co
      end
    end
  end
end

FileUtils.mkdir_p(ext_dir_name)