docs: def modified_recipes(branch='origin/master'):
      """
      Returns a set of modified recipes between the current branch and the one
      in param.
      """
      # using the contrib version on purpose rather than sh.git, since it comes
      # with a bunch of fixes, e.g. disabled TTY, see:
      # https://stackoverflow.com/a/20128598/185510
      git_diff = sh.contrib.git.diff('--name-only', branch)
      recipes = set()
      for file_path in git_diff:
          if 'pythonforandroid/recipes/' in file_path:
              recipe = file_path.split('/')[2]
              recipes.add(recipe)
      return recipes