#!/usr/bin/python3

from __future__ import print_function
import atexit
import code
import os
import readline
import logging
import sys

LOG_FILENAME = '/tmp/completer.log'
logging.basicConfig(filename=LOG_FILENAME,
                    level=logging.DEBUG,
                    )

class SimpleCompleter(object):

    def __init__(self, options):
        self.options = sorted(options)
        return

    def complete(self, text, state):
        response = None
        if state == 0:
            # This is the first time for this text, so build a match list.
            if text:
                self.matches = [s
                                for s in self.options
                                if s and s.startswith(text)]
                logging.debug('%s matches: %s', repr(text), self.matches)
            else:
                self.matches = self.options[:]
                logging.debug('(empty input) matches: %s', self.matches)

        # Return the state'th item from the match list,
        # if we have that many.
        try:
            response = self.matches[state]
        except IndexError:
            response = None
        logging.debug('complete(%s, %s) => %s',
                      repr(text), state, repr(response))
        return response

def input_loop():
    line = ''
    while line != 'stop':
        if sys.version_info >= (3, 0):
            line = input('Prompt ("stop" to quit): ')
        else:
            line = raw_input('Prompt ("stop" to quit): ')
        print('Dispatch %s' % line)

# Register our completer function
readline.set_completer(SimpleCompleter(['start', 'stop', 'list', 'print']).complete)

def my_display_matches(sustitution, matches, longest_match_length):
    print()
    for m in matches:
        print("   %s"%m)
    readline.redisplay(True)

readline.set_completion_display_matches_hook(my_display_matches)

# Use the tab key for completion
readline.parse_and_bind('tab: complete')

# Prompt the user for text
input_loop()