old_contents: '''Check for unmerged branches in the current repository'''
  
  from .run import run
  
  
  def find_unmerged_branches_in_cwd():
      '''Check for unmerged branches in the current repository'''
      _, unmerged_branches = run(['git', 'branch', '-a', '--no-merged', 'master'])
      unmerged_branches = [s.strip()
                           for s in unmerged_branches.split('\n')
                           if s.strip()]
      return unmerged_branches
  
new_contents: '''Check for unmerged branches in the current repository'''
  
  from .run import run
  
  
  # TODO: This is a bit slow. Look for a faster way to check.
  def find_unmerged_branches_in_cwd():
      '''Check for unmerged branches in the current repository'''
      _, unmerged_branches = run(['git', 'branch', '-a', '--no-merged', 'master'])
      unmerged_branches = [s.strip()
                           for s in unmerged_branches.split('\n')
                           if s.strip()]
      return unmerged_branches
  
subject: add a todo comment