# This is borrowed (slightly modified) from Scott Taylor's
# project_path project:
#   http://github.com/smtlaissezfaire/project_path

require 'pathname'

module RSpec
  module Core
    module RubyProject
      def add_to_load_path(*dirs)
        dirs.map {|dir| add_dir_to_load_path(File.join(root, dir))}
      end

      def add_dir_to_load_path(dir)
        $LOAD_PATH.unshift(dir) unless $LOAD_PATH.include?(dir)
      end

      def root
        @project_root ||= determine_root
      end

      def determine_root
        find_first_parent_containing('spec') || '.'
      end

      def find_first_parent_containing(dir)
        ascend_until {|path| File.exists?(File.join(path, dir))}
      end

      def ascend_until
        Pathname(File.expand_path('.')).ascend do |path|
          return path if yield(path)
        end
      end

      module_function :add_to_load_path
      module_function :add_dir_to_load_path
      module_function :root
      module_function :determine_root
      module_function :find_first_parent_containing
      module_function :ascend_until
    end
  end
end