module Rake::Funnel::Support::MSBuild
  class BuildTool
    class << self
      def find
        return 'xbuild' unless Rake::Win32.windows?

        require 'win32/registry'

        %w(12.0 4.0 3.5 2.0).collect { |version|
          key = "SOFTWARE\\Microsoft\\MSBuild\\ToolsVersions\\#{version}"

          begin
            Win32::Registry::HKEY_LOCAL_MACHINE.open(key) do |reg|
              candidate = File.join(reg['MSBuildToolsPath'] || '', 'msbuild.exe')
              next candidate if File.exists?(candidate)
            end
          rescue
            next
          end
        }.compact.first
      end
    end
  end
end