old_contents: import os
  import ycm_core
  from clang_helpers import PrepareClangFlags
  
  # Set this to the absolute path to the folder (NOT the file!) containing the
  # compile_commands.json file to use that instead of 'flags'. See here for
  # more details: http://clang.llvm.org/docs/JSONCompilationDatabase.html
  # Most projects will NOT need to set this to anything; you can just change the
  # 'flags' list of compilation flags. Notice that YCM itself uses that approach.
  compilation_database_folder = None
  
  # These are the compilation flags that will be used in case there's no
  # compilation database set.
  flags = [
  '-Wall',
  '-Wextra',
  '-Werror',
  '-Wc++98-compat',
  '-Wno-long-long',
  '-Wno-variadic-macros',
  '-fexceptions',
  '-DNDEBUG',
  '-DUSE_CLANG_COMPLETER',
  # THIS IS IMPORTANT! Without a "-std=<something>" flag, clang won't know which
  # language to use when compiling headers. So it will guess. Badly. So C++
  # headers will be compiled as C headers. You don't want that so ALWAYS specify
  # a "-std=<something>".
  # For a C project, you would set this to something like 'c99' instead of
  # 'c++11'.
  '-std=c++11',
  # ...and the same thing goes for the magic -x option which specifies the
  # language that the files to be compiled are written in. This is mostly
  # relevant for c++ headers.
  # For a C project, you would set this to 'c' instead of 'c++'.
  '-x',
  'c++',
  '-isystem',
  '../BoostParts',
  '-isystem',
  # This path will only work on OS X, but extra paths that don't exist are not
  # harmful
  '/System/Library/Frameworks/Python.framework/Headers',
  '-isystem',
  '../llvm/include',
  '-isystem',
  '../llvm/tools/clang/include',
  '-I',
  '.',
  '-I',
  './ClangCompleter',
  '-isystem',
  './tests/gmock/gtest',
  '-isystem',
  './tests/gmock/gtest/include',
  '-isystem',
  './tests/gmock',
  '-isystem',
  './tests/gmock/include'
  ]
  
  if compilation_database_folder:
    database = ycm_core.CompilationDatabase( compilation_database_folder )
  else:
    database = None
  
  
  def DirectoryOfThisScript():
    return os.path.dirname( os.path.abspath( __file__ ) )
  
  
  def MakeRelativePathsInFlagsAbsolute( flags, working_directory ):
    if not working_directory:
      return flags
    new_flags = []
    make_next_absolute = False
    path_flags = [ '-isystem', '-I', '-iquote', '--sysroot=' ]
    for flag in flags:
      new_flag = flag
  
      if make_next_absolute:
        make_next_absolute = False
        if not flag.startswith( '/' ):
          new_flag = os.path.join( working_directory, flag )
  
      for path_flag in path_flags:
        if flag == path_flag:
          make_next_absolute = True
          break
  
        if flag.startswith( path_flag ):
          path = flag[ len( path_flag ): ]
          new_flag = path_flag + os.path.join( working_directory, path )
          break
  
      if new_flag:
        new_flags.append( new_flag )
    return new_flags
  
  
  def FlagsForFile( filename ):
    if database:
      # Bear in mind that compilation_info.compiler_flags_ does NOT return a
      # python list, but a "list-like" StringVec object
      compilation_info = database.GetCompilationInfoForFile( filename )
      final_flags = PrepareClangFlags(
          MakeRelativePathsInFlagsAbsolute(
              compilation_info.compiler_flags_,
              compilation_info.compiler_working_dir_ ),
          filename )
  
      # NOTE: This is just for YouCompleteMe; it's highly likely that your project
      # does NOT need to remove the stdlib flag. DO NOT USE THIS IN YOUR
      # ycm_extra_conf IF YOU'RE NOT 100% YOU NEED IT.
      try:
        final_flags.remove( '-stdlib=libc++' )
      except ValueError:
        pass
    else:
      relative_to = DirectoryOfThisScript()
      pygflags = os.popen('pygmalion --flags-for-file ' + filename).read()
      final_flags = MakeRelativePathsInFlagsAbsolute( pygflags, relative_to )
  
    return {
      'flags': final_flags,
      'do_cache': True
    }
  
new_contents: import os
  import ycm_core
  from clang_helpers import PrepareClangFlags
  
  def DirectoryOfThisScript():
    return os.path.dirname( os.path.abspath( __file__ ) )
  
  
  def MakeRelativePathsInFlagsAbsolute( flags, working_directory ):
    if not working_directory:
      return flags
    new_flags = []
    make_next_absolute = False
    path_flags = [ '-isystem', '-I', '-iquote', '--sysroot=' ]
    for flag in flags:
      new_flag = flag
  
      if make_next_absolute:
        make_next_absolute = False
        if not flag.startswith( '/' ):
          new_flag = os.path.join( working_directory, flag )
  
      for path_flag in path_flags:
        if flag == path_flag:
          make_next_absolute = True
          break
  
        if flag.startswith( path_flag ):
          path = flag[ len( path_flag ): ]
          new_flag = path_flag + os.path.join( working_directory, path )
          break
  
      if new_flag:
        new_flags.append( new_flag )
    return new_flags
  
  
  def FlagsForFile( filename ):
    relative_to = DirectoryOfThisScript()
    cmd = 'pygmalion --flags-for-file ' + os.path.relpath(filename)
    pygflags = os.popen(cmd).read().strip().split(' ')
    final_flags = MakeRelativePathsInFlagsAbsolute( pygflags, relative_to )
  
    return {
      'flags': final_flags,
      'do_cache': True
    }
  
subject: Fix .ycm_extra_conf.py example