Limnoria/src/configurable.py

#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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# modification, are permitted provided that the following conditions are met:
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#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
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#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
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###

__revision__ = "$Id$"

import os

import conf
import utils
import ircdb
import ircutils
import privmsgs
import callbacks

class Dictionary(object):
    """This is a dictionary to handle configuration for individual channels,
    including a default configuration for channels that haven't modified their
    configuration from the default.
    """
    def __init__(self, seq):
        self.helps = {}
        self.types = {}
        self.defaults = {}
        self.originalNames = {}
        self.unparsedValues = {}
        self.channels = ircutils.IrcDict()
        for (name, type, default, help) in seq:
            if ',' in name:
                raise ValueError, 'There can be no commas in the name.'
            original = name
            name = callbacks.canonicalName(name)
            self.originalNames[name] = original
            self.helps[name] = utils.normalizeWhitespace(help)
            self.types[name] = type
            self.defaults[name] = default

    def __contains__(self, name):
        name = callbacks.canonicalName(name)
        return name in self.defaults

    def get(self, name, channel=None):
        name = callbacks.canonicalName(name)
        if channel is not None:
            try:
                return self.channels[channel][name]
            except KeyError:
                return self.defaults[name]
        else:
            return self.defaults[name]

    def set(self, name, value, channel=None):
        name = callbacks.canonicalName(name)
        if name not in self.originalNames:
            raise KeyError, name
        if ',' in name:
            raise ValueError, 'There can be no commas in the name.'
        self.unparsedValues[(channel, name)] = value
        if channel is not None:
            d = self.channels.setdefault(channel, {})
            d[name] = self.types[name](value)
        else:
            self.defaults[name] = self.types[name](value)

    def help(self, name):
        return self.helps[callbacks.canonicalName(name)]

    def names(self):
        L = self.originalNames.values()
        L.sort()
        return L

class Error(TypeError):
    pass

def BoolType(s):
    s = s.lower()
    if s in ('true', 'enable', 'on'):
        return True
    elif s in ('false', 'disable', 'off'):
        return False
    else:
        s = 'Value must be one of on/off/true/false/enable/disable.'
        raise Error, s

def StrType(s):
    if s and s[0] not in '\'"' and s[-1] not in '\'"':
        s = repr(s)
    try:
        v = utils.safeEval(s)
        if type(v) is not str:
            raise ValueError
    except ValueError: # This catches the utils.safeEval(s) errors too.
        raise Error, 'Value must be a string.'
    return v

def NoSpacesStrType(s):
    try:
        s = StrType(s)
        if len(s.split(None, 1)) > 1:
            raise Error
        return s
    except Error:
        raise Error, 'Value must be a string with no space characters.'

def RegexpStrType(s):
    try:
        s = StrType(s)
        r = utils.perlReToPythonRe(s)
        return r
    except ValueError, e:
        raise Error, 'Value must be a valid regular expression: %s' % e
    except Error:
        raise Error, 'Value must be a valid regular expression.'

def RegexpOrNoneStrType(s):
    try:
        if not s:
            return None
        else:
            return RegexpStrType(s)
    except Error:
        raise Error, 'Value must be a valid regular expression or the ' \
                     'empty string, representing nothing.'
        
def IntType(s):
    try:
        return int(s)
    except ValueError:
        raise Error, 'Value must be an integer.'

def PositiveIntType(s):
    try:
        i = IntType(s)
        if i > 0:
            return i
        else:
            raise Error
    except Error:
        raise Error, 'Value must be a positive integer.'


class Mixin(object):
    """A mixin class to provide a "config" command that can be consistent
    across all plugins, in order to unify the configuration for each plugin.

    Plugins subclassing this should have a "configurables" attribute which is
    a ConfigurableDictionary initialized with a list of 4-tuples of
    (name, type, default, help).  Name is the string name of the config
    variable; type is a function taking a string and returning some value of
    the type the variable is supposed to be; default is the default value the
    variable should take on; help is a string that'll be returned to describe
    the purpose of the config variable.
    """
    def __init__(self):
        className = self.__class__.__name__
        self.filename = os.path.join(conf.confDir, '%s-configurable'%className)
        if os.path.exists(self.filename):
            fd = file(self.filename)
            for line in fd:
                line = line.rstrip()
                (channel, name, value) = line.split(',', 2)
                try:
                    # The eval here is to turn from "'foo'" to 'foo'.
                    value = eval(value)
                except Exception, e:
                    self.log.error('Invalid configurable line: %r', line)
                    continue
                try:
                    if channel == 'global':
                        try:
                            self.globalConfigurables.set(name, value)
                        except AttributeError:
                            s = 'Attempt to set non-existent global ' \
                                'configurable %s' % value
                            self.log.warning(s, name)
                    else:
                        if channel == 'default':
                            channel = None
                        else:
                            assert ircutils.isChannel(channel)
                        self.configurables.set(name, value, channel)
                except Error, e: # Type error conversion.
                    s = 'Couldn\'t type-convert configurable %s: %s'
                    self.log.warning(s, name, e)
                except KeyError, e:
                    s = 'Configurable variable %s doesn\'t exist anymore.'
                    self.log.warning(s, name)

    def die(self):
        fd = file(self.filename, 'w')
        def flushDictionary(d):
            L = d.unparsedValues.items()
            L.sort()
            for ((channel, name), value) in L:
                if channel is None:
                    channel = 'default'
                name = d.originalNames[name]
                fd.write('%s,%s,%r\n' % (channel, name, value))
        if hasattr(self, 'globalConfigurables'):
            flushDictionary(self.globalConfigurables)
        flushDictionary(self.configurables)
        fd.close()

    def config(self, irc, msg, args):
        """[<channel>] [<name>] [<value>]

        Sets the value of config variable <name> to <value> on <channel>.  If
        <name> is given but <value> is not, returns the help and current value
        for <name>.  If neither <name> nor <value> is given, returns the valid
        config variables for this plugin.  <channel> is only necessary if the
        message isn't sent in the channel itself.
        """
        if not args: # They want a list of the configurables.
            names = self.configurables.names()
            if hasattr(self, 'globalConfigurables'):
                names.extend(self.globalConfigurables.names())
                names.sort()
            irc.reply(msg, utils.commaAndify(names))
        else:
            try:
                channel = privmsgs.getChannel(msg, args)
                capability = ircdb.makeChannelCapability(channel, 'op')
            except callbacks.Error:
                channel = None
                capability = 'admin'
            (name, value) = privmsgs.getArgs(args, required=1, optional=1)
            if name in self.configurables:
                if value:
                    if ircdb.checkCapability(msg.prefix, capability):
                        try:
                            self.configurables.set(name, value, channel)
                            irc.reply(msg, conf.replySuccess)
                        except Error, e:
                            irc.error(msg, str(e))
                    else:
                        irc.error(msg, conf.replyNoCapability % capability)
                else:
                    irc.reply(msg, self.configurables.help(name))
            elif hasattr(self, 'globalConfigurables') and \
                 name in self.globalConfigurables:
                if value:
                    if ircdb.checkCapability(msg.prefix, 'admin'):
                        try:
                            self.globalConfigurables.set(name, value, channel)
                            irc.reply(msg, conf.replySuccess)
                        except Error, e:
                            irc.error(msg, str(e))
                    else:
                        s = '%s is a global capability, and requires ' \
                            'the "admin" capability.'
                        irc.error(msg, s)
                else:
                    irc.reply(msg, self.globalConfigurables.help(name))
            else:
                irc.error(msg, 'There is no config variable %r' % name)


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