File Explorer

1"""2The objects used by the site module to add custom builtins.3"""4 5# Those objects are almost immortal and they keep a reference to their module6# globals.  Defining them in the site module would keep too many references7# alive.8# Note this means this module should also avoid keep things alive in its9# globals.10 11import sys12 13class Quitter(object):14    def __init__(self, name, eof):15        self.name = name16        self.eof = eof17    def __repr__(self):18        return 'Use %s() or %s to exit' % (self.name, self.eof)19    def __call__(self, code=None):20        # Shells like IDLE catch the SystemExit, but listen when their21        # stdin wrapper is closed.22        try:23            sys.stdin.close()24        except:25            pass26        raise SystemExit(code)27 28 29class _Printer(object):30    """interactive prompt objects for printing the license text, a list of31    contributors and the copyright notice."""32 33    MAXLINES = 2334 35    def __init__(self, name, data, files=(), dirs=()):36        import os37        self.__name = name38        self.__data = data39        self.__lines = None40        self.__filenames = [os.path.join(dir, filename)41                            for dir in dirs42                            for filename in files]43 44    def __setup(self):45        if self.__lines:46            return47        data = None48        for filename in self.__filenames:49            try:50                with open(filename, "r") as fp:51                    data = fp.read()52                break53            except OSError:54                pass55        if not data:56            data = self.__data57        self.__lines = data.split('\n')58        self.__linecnt = len(self.__lines)59 60    def __repr__(self):61        self.__setup()62        if len(self.__lines) <= self.MAXLINES:63            return "\n".join(self.__lines)64        else:65            return "Type %s() to see the full %s text" % ((self.__name,)*2)66 67    def __call__(self):68        self.__setup()69        prompt = 'Hit Return for more, or q (and Return) to quit: '70        lineno = 071        while 1:72            try:73                for i in range(lineno, lineno + self.MAXLINES):74                    print(self.__lines[i])75            except IndexError:76                break77            else:78                lineno += self.MAXLINES79                key = None80                while key is None:81                    key = input(prompt)82                    if key not in ('', 'q'):83                        key = None84                if key == 'q':85                    break86 87 88class _Helper(object):89    """Define the builtin 'help'.90 91    This is a wrapper around pydoc.help that provides a helpful message92    when 'help' is typed at the Python interactive prompt.93 94    Calling help() at the Python prompt starts an interactive help session.95    Calling help(thing) prints help for the python object 'thing'.96    """97 98    def __repr__(self):99        return "Type help() for interactive help, " \100               "or help(object) for help about object."101    def __call__(self, *args, **kwds):102        import pydoc103        return pydoc.help(*args, **kwds)104