#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions, and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#   * Neither the name of the author of this software nor the name of
#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# POSSIBILITY OF SUCH DAMAGE.
###

"""
Provides commands available only on Unix.
"""

from baseplugin import *

import os
import re
import pwd
import crypt
import errno
import random
import struct
import popen2


import privmsgs
import callbacks
import utils

def configure(onStart, afterConnect, advanced):
    from questions import expect, anything, something, yn
    onStart.append('load Unix')
    cmdLine = utils.findBinaryInPath('aspell')
    if not cmdLine:
        cmdLine = utils.findBinaryInPath('ispell')
    if not cmdLine:
        print 'NOTE: I couldn\'t find aspell or ispell in your path,'
        print 'so that function of this module will not work.  You may'
        print 'choose to install it later, and then the module will'
        print 'automatically work, as long as it is in the path of the'
        print 'user that supybot runs under.'
        print 

    print 'The "progstats" command can reveal potentially sensitive'
    print 'information about your machine.  Here\'s an example of its output:'
    print
    print progstats()
    print
    if yn('Would you like to disable this command?') == 'y':
        onStart.append('disable progstats')

def progstats():
    pw = pwd.getpwuid(os.getuid())
    response = 'Process ID %i running as user "%s" and as group "%s" '\
               'from directory "%s" with the command line "%s".  '\
               'Running on Python %s.' %\
               (os.getpid(), pw[0], pw[3],
                os.getcwd(), " ".join(sys.argv),
                sys.version.translate(string.ascii, '\r\n'))
    return response
    

class Unix(callbacks.Privmsg):
    def __init__(self):
        callbacks.Privmsg.__init__(self)
        # Initialize a file descriptor for the spell module.
        cmdLine = utils.findBinaryInPath('aspell')
        if not cmdLine:
            cmdLine = utils.findBinaryInPath('ispell')
        (self._spellRead, self._spellWrite) = popen2.popen4(cmdLine + ' -a', 0)
        # Ignore the banner
        self._spellRead.readline()

    def die(self):
        # close the filehandles
        for h in (self._spellRead, self._spellWrite):
                h.close()

    def errno(self, irc, msg, args):
        """<error number or code>

        Returns the number of an errno code, or the errno code of a number.
        """
        s = privmsgs.getArgs(args)
        try:
            i = int(s)
            name = errno.errorcode[i]
        except ValueError:
            name = s.upper()
            try:
                i = getattr(errno, name)
            except AttributeError:
                irc.reply(msg, 'I can\'t find the errno number for that code.')
                return
        except KeyError:
            name = '(unknown)'
        irc.reply(msg, '%s (#%s): %s' % (name, i, os.strerror(i)))
            
    def progstats(self, irc, msg, args):
        """takes no arguments

        Returns various unix-y information on the running supybot process.
        """
        irc.reply(msg, progstats())

    _cryptre = re.compile(r'[./0-9A-Za-z]')
    def crypt(self, irc, msg, args):
        """<password> [<salt>]

        Returns the resulting of doing a crypt() on <password>  If <salt> is
        not given, uses a random salt.  If running on a glibc2 system,
        prepending '$1$' to your salt will cause crypt to return an MD5sum
        based crypt rather than the standard DES based crypt.
        """
        def makeSalt():
            s = '\x00'
            while self._cryptre.sub('', s) != '':
                s = struct.pack('<h', random.randrange(2**16))
            return s
        (password, salt) = privmsgs.getArgs(args, optional=1)
        if salt == '':
            salt = makeSalt()
        irc.reply(msg, crypt.crypt(password, salt))

    def spell(self, irc, msg, args): 
        """<word>

        Returns the result of passing <word> to aspell/ispell.  The results
        shown are sorted from best to worst in terms of being a likely match
        for the spelling of <word>.
        """
        # We are only checking the first word
        word = privmsgs.getArgs(args)
        if ' ' in word:
            irc.error(msg, 'Aspell/ispell can\'t handle spaces in words.')
            return
        self._spellWrite.write(word)
        self._spellWrite.write('\n')
        line = self._spellRead.readline() 
        # aspell puts extra whitespace, ignore it
        while line == '\n':
            line = self._spellRead.readline()
        # parse the output
        if line[0] in '*+':
            resp = '"%s" may be spelled correctly.' % word
        elif line[0] == '#':
            resp = 'Could not find an alternate spelling for "%s"' % word
        elif line[0] == '&':
            matches = line.split(':')[1].strip()
            match_list = matches.split(', ')
            total = len(match_list)
            ircutils.shrinkList(match_list, ', ', 350)
            shown = len(match_list)
            resp = 'Possible spellings for "%s" (%d found, %d shown): %s.' % \
                (word, total, shown, ', '.join(match_list))
        else:
            resp = 'Something unexpected was seen in the [ai]spell output.'
        irc.reply(msg, resp)
            

Class = Unix
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