#!/usr/bin/env python
# encoding: utf-8
#
# Copyright (c) 2008 Doug Hellmann All rights reserved.
#
"""
"""

__version__ = "$Id$"
#end_pymotw_header

import readline
import logging
import os

LOG_FILENAME = '/tmp/completer.log'
HISTORY_FILENAME = '/tmp/completer.hist'

logging.basicConfig(filename=LOG_FILENAME,
                    level=logging.DEBUG,
                    )

def get_history_items():
    num_items = readline.get_current_history_length() + 1
    return [ readline.get_history_item(i)
             for i in xrange(1, num_items)
             ]

class HistoryCompleter(object):

    def __init__(self):
        self.matches = []
        return

    def complete(self, text, state):
        response = None
        if state == 0:
            history_values = get_history_items()
            logging.debug('history: %s', history_values)
            if text:
                self.matches = sorted(h
                                      for h in history_values
                                      if h and h.startswith(text))
            else:
                self.matches = []
            logging.debug('matches: %s', self.matches)
        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():
    if os.path.exists(HISTORY_FILENAME):
        readline.read_history_file(HISTORY_FILENAME)
    print 'Max history file length:', readline.get_history_length()
    print 'Startup history:', get_history_items()
    try:
        while True:
            line = raw_input('Prompt ("stop" to quit): ')
            if line == 'stop':
                break
            if line:
                print 'Adding "%s" to the history' % line
    finally:
        print 'Final history:', get_history_items()
        readline.write_history_file(HISTORY_FILENAME)

# Register our completer function
readline.set_completer(HistoryCompleter().complete)

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

# Prompt the user for text
input_loop()