old_contents: from grow.common import utils
  from grow.pods import pods
  from grow.pods import storage
  import click
  import os
  
  
  @click.command()
  @click.argument('pod_path', default='.')
  @click.option('--all', '-A', 'run_all', is_flag=True, default=False,
                help='Whether to run all preprocessors, even if a preprocessor'
                     ' has autorun disabled.')
  @click.option('--preprocessor', '-p', type=str, multiple=True,
                help='Name of preprocessor to run. Preprocessors controlled by'
                     ' the preprocess command must have names or tags.')
  @click.option('--tag', '-tag', type=str, multiple=True,
                help='Tags of preprocessors to run. Preprocessors controlled by'
                     ' the preprocess command must have names or tags.')
  @click.option('--ratelimit', type=int,
                help='Limit the execution speed of preprocessors. Grow will '
                     'sleep for X seconds between running each preprocessor, '
                     'where X is the value of --ratelimit. This flag can be '
                     'useful when using mulitple Google APIs-based '
                     'preprocessors on the same resource to avoid rate limit '
                     'errors.')
  def preprocess(pod_path, preprocessor, run_all, tag, ratelimit):
      """Runs preprocessors."""
      root = os.path.abspath(os.path.join(os.getcwd(), pod_path))
      pod = pods.Pod(root, storage=storage.FileStorage)
      pod.preprocess(preprocessor, run_all=run_all, tags=tag, ratelimit=ratelimit)
  
new_contents: from grow.common import utils
  from grow.pods import pods
  from grow.pods import storage
  import click
  import os
  
  
  @click.command()
  @click.argument('pod_path', default='.')
  @click.option('--all', '-A', 'run_all', is_flag=True, default=False,
                help='Whether to run all preprocessors, even if a preprocessor'
                     ' has autorun disabled.')
  @click.option('--preprocessor', '-p', type=str, multiple=True,
                help='Name of preprocessor to run. Preprocessors controlled by'
                     ' the preprocess command must have names or tags.')
  @click.option('--tag', '-t', type=str, multiple=True,
                help='Tags of preprocessors to run. Preprocessors controlled by'
                     ' the preprocess command must have names or tags.')
  @click.option('--ratelimit', type=int,
                help='Limit the execution speed of preprocessors. Grow will '
                     'sleep for X seconds between running each preprocessor, '
                     'where X is the value of --ratelimit. This flag can be '
                     'useful when using mulitple Google APIs-based '
                     'preprocessors on the same resource to avoid rate limit '
                     'errors.')
  def preprocess(pod_path, preprocessor, run_all, tag, ratelimit):
      """Runs preprocessors."""
      root = os.path.abspath(os.path.join(os.getcwd(), pod_path))
      pod = pods.Pod(root, storage=storage.FileStorage)
      pod.preprocess(preprocessor, run_all=run_all, tags=tag, ratelimit=ratelimit)
  
subject: Add -t alias to --tag flag for preprocess command.