Function prompt

git-p4.py:199–215

Prompt the user to choose one of the choices. Choices are identified in the prompt_text by square brackets around a single letter option.

(prompt_text)

def prompt(prompt_text):
    """Prompt the user to choose one of the choices.

       Choices are identified in the prompt_text by square brackets around a
       single letter option.
       """
    choices = set(m.group(1) for m in re.finditer(r"\[(.)\]", prompt_text))
    while True:
        sys.stderr.flush()
        sys.stdout.write(prompt_text)
        sys.stdout.flush()
        response = sys.stdin.readline().strip().lower()
        if not response:
            continue
        response = response[0]
        if response in choices:
            return response


# We need different encoding/decoding strategies for text data being passed