# -*- coding: utf-8 -*-
# Copyright 2018 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Common functions used from multiple files.
"""

from __future__ import print_function

import subprocess

def parse_shell_args(s):
  """Parses the string representing shell arguments (e.g. C++ flags) as a list.

  For example, '''-DFOO=a -DBAR='"b c"' -DBAZ="d e f"''' becomes
  ['-DFOO=a', '-DBAR="b c"', '-DBAZ=d e f'].
  For GN, strings to be passed to the shell must have been parsed, as otherwise
  they are escaped by GN on emitting ninja files.
  """
  # The dummy variable prevents the first value in s from interpreted as a flag
  # for echo. IFS is set to separate $* with newlines.
  output = subprocess.check_output(
      ['eval "set -- dummy $0"; IFS=$\'\\n\'; echo -n "$*"', s], shell=True)
  return output.splitlines()[1:]