code: def purge_stash(force, stash, passphrase, backend):
      
      stash = _get_stash(backend, stash, passphrase)
  
      try:
          click.echo('Purging stash...')
          stash.purge(force)
          # Maybe we should verify that the list is empty
          # afterwards?
          click.echo('Purge complete!')
      except GhostError as ex:
          sys.exit(ex)
docs: Purge the stash from all of its keys