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Viewing changes to userinteractor.py

  • Committer: Aaron Bentley
  • Date: 2006-03-16 14:53:00 UTC
  • mfrom: (0.1.96 shelf)
  • mto: This revision was merged to the branch mainline in revision 334.
  • Revision ID: abentley@panoramicfeedback.com-20060316145300-836889d55437eb15
Merge shelf v2

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userinteractor.py
 
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#!/usr/bin/python
 
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import sys
 
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class UserOption:
 
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    def __init__(self, char, action, help, default=False):
 
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        self.char = char
 
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        self.action = action
 
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        self.default = default
 
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        self.help = help
 
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class UserInteractor(object):
 
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    # Special actions
 
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    RESTART = 0
 
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    QUIT = 1
 
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    FINISH = 2
 
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    def __init__(self):
 
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        self.items = []
 
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    def add_item(self, item):
 
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        self.items.append(item)
 
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        self.__total_items = len(self.items)
 
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    def set_items(self, item_list):
 
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        self.items = item_list
 
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        self.__total_items = len(self.items)
 
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    def set_item_callback(self, cb):
 
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        self.item_callback = cb
 
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    def set_start_callback(self, cb):
 
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        self.start_callback = cb
 
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    def set_end_callback(self, cb):
 
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        self.end_callback = cb
 
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    def set_prompt(self, prompt):
 
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        self.prompt = prompt
 
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    def set_options(self, opt_list):
 
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        self._options = []
 
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        self._option_dict = {}
 
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        for option in opt_list:
 
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            self.add_option(option)
 
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    def add_option(self, option):
 
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        self._options.append(option)
 
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        self._option_dict[option.char] = option
 
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    def get_option(self, char):
 
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        return self._option_dict[char]
 
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    def __do_action(self, action, item):
 
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        if type(action) is int:
 
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            if action == self.QUIT:
 
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                self.__quit = True
 
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                self.__finished = True
 
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            elif action == self.RESTART:
 
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                self.__restart = True
 
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                self.__finished = False
 
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            elif action == self.FINISH:
 
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                self.__finished = True
 
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            return True
 
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        else:
 
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            return action(item)
 
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    def __select_loop(self):
 
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        i = 0
 
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        self.start_callback()
 
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        while i < len(self.items):
 
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                item = self.items[i]
 
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                self.item_callback(item, i + 1)
 
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                if self.__ask_once(item, i + 1):
 
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                    i += 1
 
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                if self.__quit or self.__finished:
 
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                    break
 
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    def interact(self):
 
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        self.__quit = False
 
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        self.__finished = False
 
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        while not self.__quit and not self.__finished:
 
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            self.__restart = False
 
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            self.__select_loop()
 
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            if self.__quit:
 
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                break
 
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            if self.end_callback():
 
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                break
 
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            self.__finished = False
 
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            self.__ask_once(None, self.__total_items)
 
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            while not self.__finished and not self.__restart:
 
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                self.__ask_once(None, -1)
 
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        return not self.__quit
 
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    def __ask_once(self, item, count):
 
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        args = {'count': count, 'total' : self.__total_items}
 
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        while True:
 
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            sys.stdout.write(self.prompt % args)
 
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            sys.stdout.write(' [')
 
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            for opt in self._options:
 
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                if opt.default:
 
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                    default = opt
 
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                sys.stdout.write(opt.char)
 
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            sys.stdout.write('?] (%s): ' % default.char)
 
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            response = self.__getchar()
 
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            # default, which we see as newline, is 'n'
 
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            if response in ['\n', '\r', '\r\n']:
 
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                response = default.char
 
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            print response # because echo is off
 
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            for opt in self._options:
 
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                if opt.char == response:
 
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                    return self.__do_action(opt.action, item)
 
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            self.__show_help()
 
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        return False # keep pychecker happy
 
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    def __show_help(self):
 
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        for opt in self._options:
 
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            print '  %s - %s' % (opt.char, opt.help)
 
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    if sys.platform == "win32":
 
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        import msvcrt
 
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        def __getchar(self):
 
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            return msvcrt.getche()
 
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    else:
 
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        def __getchar(self):
 
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            import tty
 
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            import termios
 
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            fd = sys.stdin.fileno()
 
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            settings = termios.tcgetattr(fd)
 
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            try:
 
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                tty.setraw(fd)
 
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                ch = sys.stdin.read(1)
 
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            finally:
 
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                termios.tcsetattr(fd, termios.TCSADRAIN, settings)
 
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            return ch