old_contents: from grow.common import utils
  from grow.deployments.destinations import local as local_destination
  from grow.deployments.stats import stats
  from grow.pods import pods
  from grow.pods import storage
  import click
  import os
  
  
  @click.command()
  @click.argument('pod_path', default='.')
  @click.option('--preprocessor', type=str, multiple=True,
                help='Which preprocessor to run. Preprocessors controlled by'
                     ' the preprocess command must have names.')
  def preprocess(pod_path, preprocessor):
    """Runs preprocessors."""
    root = os.path.abspath(os.path.join(os.getcwd(), pod_path))
    pod = pods.Pod(root, storage=storage.FileStorage)
    pod.preprocess(preprocessor)
  
new_contents: from grow.common import utils
  from grow.deployments.destinations import local as local_destination
  from grow.deployments.stats import stats
  from grow.pods import pods
  from grow.pods import storage
  import click
  import os
  
  
  @click.command()
  @click.argument('pod_path', default='.')
  @click.option('--preprocessor', '-p', type=str, multiple=True,
                help='Which preprocessor to run. Preprocessors controlled by'
                     ' the preprocess command must have names.')
  def preprocess(pod_path, preprocessor):
    """Runs preprocessors."""
    root = os.path.abspath(os.path.join(os.getcwd(), pod_path))
    pod = pods.Pod(root, storage=storage.FileStorage)
    pod.preprocess(preprocessor)
  
subject: Add -p flag to grow preprocess command. Fixes #121.