+
−# -*- coding: UTF-8 -*-
+
−# Copyright (c) 2010 - 2011, Pascal Volk
+
−# See COPYING for distribution information.
+
−"""
+
−    VirtualMailManager.cli
+
−    ~~~~~~~~~~~~~~~~~~~~~~
+
−
+
−    VirtualMailManager's command line interface.
+
−"""
+
−
+
−import os
+
−from array import array
+
−from fcntl import ioctl
+
−from getpass import getpass
+
−from termios import TIOCGWINSZ
+
−
+
−from VirtualMailManager import ENCODING
+
−from VirtualMailManager.constants import VMM_TOO_MANY_FAILURES
+
−from VirtualMailManager.errors import VMMError
+
−
+
−
+
−__all__ = ('prog', 'get_winsize', 'read_pass', 'w_err', 'w_std')
+
−
+
−_ = lambda msg: msg
+
−_std_write = os.sys.stdout.write
+
−_err_write = os.sys.stderr.write
+
−prog = os.path.basename(os.sys.argv[0])
+
−
+
−
+
−def w_std(*args):
+
−    """Writes a line for each arg of *args*, encoded in the current
+
−    ENCODING, to stdout.
+
−    """
+
−    _std_write('\n'.join(a.encode(ENCODING, 'replace') for a in args) + '\n')
+
−
+
−
+
−def w_err(code, *args):
+
−    """Writes a line for each arg of *args*, encoded in the current
+
−    ENCODING, to stderr.
+
−    This function optionally interrupts the program execution if *code*
+
−    does not equal to 0. *code* will be used as the system exit status.
+
−    """
+
−    _err_write('\n'.join(a.encode(ENCODING, 'replace') for a in args) + '\n')
+
−    if code:
+
−        os.sys.exit(code)
+
−
+
−
+
−def get_winsize():
+
−    """Returns a tuple of integers ``(ws_row, ws_col)`` with the height and
+
−    width of the terminal."""
+
−    fd = None
+
−    for dev in (os.sys.stdout, os.sys.stderr, os.sys.stdin):
+
−        if hasattr(dev, 'fileno') and os.isatty(dev.fileno()):
+
−            fd = dev.fileno()
+
−            break
+
−    if fd is None:  # everything seems to be redirected
+
−        # fall back to environment or assume some common defaults
+
−        ws_row, ws_col = 24, 80
+
−        try:
+
−            ws_col = int(os.environ.get('COLUMNS', 80))
+
−            ws_row = int(os.environ.get('LINES', 24))
+
−        except ValueError:
+
−            pass
+
−        return ws_row, ws_col
+
−    #"struct winsize" with the ``unsigned short int``s ws_{row,col,{x,y}pixel}
+
−    ws = array('H', (0, 0, 0, 0))
+
−    ioctl(fd, TIOCGWINSZ, ws, True)
+
−    ws_row, ws_col = ws[:2]
+
−    return ws_row, ws_col
+
−
+
−
+
−def read_pass():
+
−    """Interactive 'password chat', returns the password in plain format.
+
−
+
−    Throws a VMMError after the third failure.
+
−    """
+
−    # TP: Please preserve the trailing space.
+
−    readp_msg0 = _(u'Enter new password: ').encode(ENCODING, 'replace')
+
−    # TP: Please preserve the trailing space.
+
−    readp_msg1 = _(u'Retype new password: ').encode(ENCODING, 'replace')
+
−    mismatched = True
+
−    failures = 0
+
−    while mismatched:
+
−        if failures > 2:
+
−            raise VMMError(_(u'Too many failures - try again later.'),
+
−                           VMM_TOO_MANY_FAILURES)
+
−        clear0 = getpass(prompt=readp_msg0)
+
−        clear1 = getpass(prompt=readp_msg1)
+
−        if clear0 != clear1:
+
−            failures += 1
+
−            w_err(0, _(u'Sorry, passwords do not match'))
+
−            continue
+
−        if not clear0:
+
−            failures += 1
+
−            w_err(0, _(u'Sorry, empty passwords are not permitted'))
+
−            continue
+
−        mismatched = False
+
−    return clear0
+
−
+
−del _