GeezerVison

sqlite> . |
help
version
quit

sqlite> .|
.help
.version
.quit

sqlite> . help |
# no candidates

COMMANDS = ("quit", "help", "version")


def _complete(text, state):
    global _completion_matches

    if state == 0:
        import readline

        origline = readline.get_line_buffer()
        if origline.startswith("."):
            if origline == text:
                text_lstrip = text.lstrip(".")
                _completion_matches = [f".{cmd}" for cmd in COMMANDS
                                       if cmd.startswith(text_lstrip)]
            elif origline.removeprefix(".").lstrip(" ") == text:
                _completion_matches = [cmd for cmd in COMMANDS
                                       if cmd.startswith(text)]
            else:
                _completion_matches.clear()
        else:
            text_upper = text.upper()
            _completion_matches = [c for c in SQLITE_KEYWORDS if c.startswith(text_upper)]
    try:
        return _completion_matches[state] + " "
    except IndexError:
        return None