# File lib/thor/actions.rb, line 133
    def find_in_source_paths(file)
      relative_root = relative_to_original_destination_root(destination_root, false)

      source_paths.each do |source|
        source_file = File.expand_path(file, File.join(source, relative_root))
        return source_file if File.exists?(source_file)
      end

      message = "Could not find #{file.inspect} in any of your source paths. "

      unless self.class.source_root
        message << "Please invoke #{self.class.name}.source_root(PATH) with the PATH containing your templates. "
      end

      if source_paths.empty?
        message << "Currently you have no source paths."
      else
        message << "Your current source paths are: \n#{source_paths.join("\n")}"
      end

      raise Error, message
    end