Comments about input handling.

core/reader.py

@@ -47,7 +47,7 @@ def __init__(self, ps1, arena):

  def _GetLine(self):
    try:
      ret = raw_input(self.prompt_str) + '\n'
      ret = raw_input(self.prompt_str) + '\n'  # newline required
    except EOFError:
      ret = None
    self.prompt_str = _PS2
@@ -77,8 +77,9 @@ def _GetLine(self):
    if not line:
      return None

    # The last line should be passed to the Lexer with a '\n', even if it
    # didn't have one.
    # TODO: Remove this anachonism.  We no longer need every line to end with a
    # newline.  See input handling comment at the top of osh/lex.py.  (I tried
    # and it made a bunch of tests fail.)
    if not line.endswith('\n'):
      line += '\n'