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import sys
from bzrlib.osutils import getchar
class UserOption:
def __init__(self, char, action, help, default=False):
self.char = char
self.action = action
self.default = default
self.help = help
class UserInteractor(object):
# Special actions
RESTART = 0
QUIT = 1
FINISH = 2
def __init__(self):
self.items = []
def add_item(self, item):
self.items.append(item)
self.__total_items = len(self.items)
def set_items(self, item_list):
self.items = item_list
self.__total_items = len(self.items)
def set_item_callback(self, cb):
self.item_callback = cb
def set_start_callback(self, cb):
self.start_callback = cb
def set_end_callback(self, cb):
self.end_callback = cb
def set_prompt(self, prompt):
self.prompt = prompt
def set_options(self, opt_list):
self._options = []
self._option_dict = {}
for option in opt_list:
self.add_option(option)
def add_option(self, option):
self._options.append(option)
self._option_dict[option.char] = option
def get_option(self, char):
return self._option_dict[char]
def __do_action(self, action, item):
if type(action) is int:
if action == self.QUIT:
self.__quit = True
self.__finished = True
elif action == self.RESTART:
self.__restart = True
self.__finished = False
elif action == self.FINISH:
self.__finished = True
return True
else:
return action(item)
def __select_loop(self):
i = 0
self.start_callback()
while i < len(self.items):
item = self.items[i]
self.item_callback(item, i + 1)
if self.__ask_once(item, i + 1):
i += 1
if self.__quit or self.__finished:
break
def interact(self):
self.__quit = False
self.__finished = False
while not self.__quit and not self.__finished:
self.__restart = False
self.__select_loop()
if self.__quit:
break
if self.end_callback():
break
self.__finished = False
self.__ask_once(None, self.__total_items)
while not self.__finished and not self.__restart:
self.__ask_once(None, -1)
return not self.__quit
def __ask_once(self, item, count):
args = {'count': count, 'total' : self.__total_items}
while True:
sys.stdout.write(self.prompt % args)
sys.stdout.write(' [')
for opt in self._options:
if opt.default:
default = opt
sys.stdout.write(opt.char)
sys.stdout.write('?] (%s): ' % default.char)
response = getchar()
# default, which we see as newline, is 'n'
if response in ['\n', '\r', '\r\n']:
response = default.char
print response # because echo is off
for opt in self._options:
if opt.char == response:
return self.__do_action(opt.action, item)
self.__show_help()
return False # keep pychecker happy
def __show_help(self):
for opt in self._options:
print ' %s - %s' % (opt.char, opt.help)
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