code: def patch(filepath, debug):
      
      print("patch 'pause' in %r" % filepath)
      with open(filepath, "r") as infile:
          origin_content = infile.read()
  
      new_content = origin_content.replace("pause\n", """echo "'pause'"\n""")
      assert new_content!=origin_content, "not changed: %s" % origin_content
  
      with open(filepath, "w") as outfile:
          outfile.write(new_content)
  
      print("%r patched" % filepath)
      if debug:
          print("-"*79)
          print(repr(new_content))
          print("-"*79)
          print(new_content)
          print("-"*79)
docs: replace 'pause' from windows batch.
      Needed for ci.appveyor.com
      see: https://github.com/appveyor/ci/issues/596