gistfile1.rb

module CrazyFunDotNet
  class DotNetLibrary < Tasks
    private

    def reference_assemblies_dir()
      @reference_assemblies_dir ||= (
        program_files_dir = find_env(['ProgramFiles(x86)', 'programfiles(x86)', 'PROGRAMFILES(X86)'], "C:/Program Files (x86)")

        unless File.exists? program_files_dir
          program_files_dir = find_env(['ProgramFiles', 'programfiles', 'PROGRAMFILES'], "C:/Program Files")
        end

        File.join(program_files_dir, 'Reference Assemblies', 'Microsoft', 'Framework')
      )
    end

    def framework_dir()
      @framework_dir ||= (
        windows_dir = find_env(['WinDir', 'windir', 'WINDIR'], "C:/Windows")
        File.join(windows_dir, 'Microsoft.NET', 'Framework')
      )
    end

    def resolve_framework_reference(ref, version)
      if version == "3.5"
        assembly = File.join(reference_assemblies_dir(), "v" + version, ref)
        unless File.exists? assembly
          assembly = File.join(framework_dir(), "v2.0.50727", ref)
        end

        return assembly.to_s
      end
      return File.join(reference_assemblies_dir(), '.NETFramework', "v" + version, ref).to_s
    end

    def find_env(possible_vars, fallback)
      possible_vars.find { |e| ENV[e] } or fallback
    end
  end
end