def gen_usage
      puts 'Usage:'
      puts '  poole [ACTION] [ARG]'
      puts ''
      puts 'Actions:'
      puts '  draft      Create a new draft in _drafts with title SLUG'
      puts '  post       Create a new timestamped post in _posts with title SLUG'
      puts '  publish    Publish the draft with SLUG, timestamping appropriately'
      puts '  unpublish  Move a post to _drafts, untimestamping appropriately'
      exit
    end
def gen_usage
      puts 'Usage:'
      puts '  poole [ACTION] [ARG]'
      puts ''
      puts 'Actions:'
      puts '  draft      Create a new draft in _drafts with title SLUG'
      puts '  post       Create a new timestamped post in _posts with title SLUG'
      puts '  publish    Publish the draft with SLUG, timestamping appropriately'
      puts '  unpublish  Move a post to _drafts, untimestamping appropriately'
      exit
    end
Print a usage message and exit