idiff.py 文件源码

def unified(fromlines, tolines, context):
  """Generate unified diff"""

  diff = difflib.Differ().compare(fromlines, tolines)
  lastrow = None
  had_changes = 0

  for row in _trim_context(diff, context):
    if row[0].startswith("? "):
      had_changes = 1
      yield _differ_split(lastrow, row[0])
      lastrow = None
    else:
      if lastrow:
        had_changes = 1
        yield _differ_split(lastrow, None)
      lastrow = row

  if lastrow:
    had_changes = 1
    yield _differ_split(lastrow, None)

  if not had_changes:
    yield _item(type=_RCSDIFF_NO_CHANGES)