VirtualMailManager/cli/__init__.py
author Pascal Volk <neverseen@users.sourceforge.net>
Tue, 03 Aug 2010 23:33:46 +0000
branchv0.6.x
changeset 336 d24c2ea39710
parent 320 011066435e6f
child 340 4515afec62e5
permissions -rw-r--r--
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2010, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.cli
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    ~~~~~~~~~~~~~~~~~~~~~~
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    VirtualMailManager's command line interface.
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"""
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import os
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from array import array
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from fcntl import ioctl
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from getpass import getpass
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from termios import TIOCGWINSZ
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from VirtualMailManager import ENCODING
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from VirtualMailManager.constants import VMM_TOO_MANY_FAILURES
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from VirtualMailManager.errors import VMMError
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__all__ = ('get_winsize', 'read_pass', 'w_err', 'w_std')
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_ = lambda msg: msg
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_std_write = os.sys.stdout.write
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_err_write = os.sys.stderr.write
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def w_std(*args):
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    """Writes a line for each arg of *args*, encoded in the current
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    ENCODING, to stdout.
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    """
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    _std_write('\n'.join(a.encode(ENCODING, 'replace') for a in args) + '\n')
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def w_err(code, *args):
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    """Writes a line for each arg of *args*, encoded in the current
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    ENCODING, to stderr.
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    This function optionally interrupts the program execution if *code*
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    does not equal to 0. *code* will be used as the system exit status.
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    """
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    _err_write('\n'.join(a.encode(ENCODING, 'replace') for a in args) + '\n')
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    if code:
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        os.sys.exit(code)
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def get_winsize():
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    """Returns a tuple of integers ``(ws_row, ws_col)`` with the height and
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    width of the terminal."""
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    fd = None
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    for dev in (os.sys.stdout, os.sys.stderr, os.sys.stdin):
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        if hasattr(dev, 'fileno') and os.isatty(dev.fileno()):
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            fd = dev.fileno()
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            break
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    if fd is None:  # everything seems to be redirected
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        # fall back to environment or assume some common defaults
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        ws_row, ws_col = 24, 80
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        try:
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            ws_col = int(os.environ.get('COLUMNS', 80))
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            ws_row = int(os.environ.get('LINES', 24))
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        except ValueError:
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            pass
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        return ws_row, ws_col
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    #"struct winsize" with the ``unsigned short int``s ws_{row,col,{x,y}pixel}
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    ws = array('H', (0, 0, 0, 0))
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    ioctl(fd, TIOCGWINSZ, ws, True)
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    ws_row, ws_col = ws[:2]
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    return ws_row, ws_col
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def read_pass():
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    """Interactive 'password chat', returns the password in plain format.
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    Throws a VMMError after the third failure.
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    """
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    # TP: Please preserve the trailing space.
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    readp_msg0 = _(u'Enter new password: ').encode(ENCODING, 'replace')
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    # TP: Please preserve the trailing space.
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    readp_msg1 = _(u'Retype new password: ').encode(ENCODING, 'replace')
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    mismatched = True
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    failures = 0
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    while mismatched:
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        if failures > 2:
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            raise VMMError(_(u'Too many failures - try again later.'),
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                           VMM_TOO_MANY_FAILURES)
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        clear0 = getpass(prompt=readp_msg0)
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        clear1 = getpass(prompt=readp_msg1)
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        if clear0 != clear1:
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            failures += 1
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            w_err(0, _(u'Sorry, passwords do not match'))
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            continue
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        if not clear0:
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            failures += 1
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            w_err(0, _(u'Sorry, empty passwords are not permitted'))
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            continue
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        mismatched = False
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    return clear0
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del _