_rake_refresh () {
    if [ -f .rake_tasks ]; then
      rm .rake_tasks
    fi
    echo "Generating .rake_tasks..." > /dev/stderr
    _rake_generate
    cat .rake_tasks
  }
  
  _rake_does_task_list_need_generating () {
    if [ ! -f .rake_tasks ]; then return 0;
    else
      if [[ "$OSTYPE" = darwin* ]]; then
        accurate=$(stat -f%m .rake_tasks)
        changed=$(stat -f%m Rakefile)
      else
        accurate=$(stat -c%Y .rake_tasks)
        changed=$(stat -c%Y Rakefile)
      fi
      return $(expr $accurate '>=' $changed)
    fi
  }
  
  _rake_generate () {
    rake --silent --tasks | cut -d " " -f 2 > .rake_tasks
  }
  
  _rake () {
    if [ -f Rakefile ]; then
      if _rake_does_task_list_need_generating; then
        echo "
  Generating .rake_tasks..." > /dev/stderr
        _rake_generate
      fi
      compadd `cat .rake_tasks`
    fi
  }
  
  compdef _rake rake
  alias rake_refresh='_rake_refresh'