text: # Utility functions used in conf.py
  # SPDX-License-Identifier: Apache-2.0
  #
  # Copyright 2017 Espressif Systems (Shanghai) PTE LTD
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http:#www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from __future__ import unicode_literals
  from io import open
  import os
  import shutil
  import subprocess
  
  
  def run_cmd_get_output(cmd):
      try:
          with open(os.devnull, 'w') as devnull:
              output = subprocess.check_output(cmd, stderr=devnull, shell=True).strip()
      except subprocess.CalledProcessError as e:
          output = e.output.decode('ascii')
  
      return output
  
  
  def files_equal(path_1, path_2):
      if not os.path.exists(path_1) or not os.path.exists(path_2):
          return False
      file_1_contents = ''
      with open(path_1, "r", encoding='utf-8') as f_1:
          file_1_contents = f_1.read()
      file_2_contents = ''
      with open(path_2, "r", encoding='utf-8') as f_2:
          file_2_contents = f_2.read()
      return file_1_contents == file_2_contents
  
  
  def copy_file_if_modified(src_file_path, dst_file_path):
      if not files_equal(src_file_path, dst_file_path):
          dst_dir_name = os.path.dirname(dst_file_path)
          if not os.path.isdir(dst_dir_name):
              os.makedirs(dst_dir_name)
          shutil.copy(src_file_path, dst_file_path)
  
  
  def copy_if_modified(src_path, dst_path):
      if os.path.isfile(src_path):
          copy_file_if_modified(src_path, dst_path)
          return
  
      src_path_len = len(src_path)
      for root, _, files in os.walk(src_path):
          for src_file_name in files:
              src_file_path = os.path.join(root, src_file_name)
              dst_file_path = os.path.join(dst_path + root[src_path_len:], src_file_name)
              copy_file_if_modified(src_file_path, dst_file_path)
  