Limnoria/plugins/Lookup.py

#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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###

"""
The Lookup plugin handles looking up various values by their key.
"""

from baseplugin import *

import os
import sys

import sqlite

import conf
import utils
import privmsgs
import callbacks


def configure(onStart, afterConnect, advanced):
    # This will be called by setup.py to configure this module.  onStart and
    # afterConnect are both lists.  Append to onStart the commands you would
    # like to be run when the bot is started; append to afterConnect the
    # commands you would like to be run when the bot has finished connecting.
    from questions import expect, anything, something, yn
    onStart.append('load Lookup')
    print 'This module allows you to define commands that do a simple key'
    print 'lookup and return some simple value.  It has a command "addlookup"'
    print 'that takes a command name and a file in conf.dataDir and adds a'
    print 'command with that name that responds with mapping from that file.'
    print 'The file itself should be composed of lines of the form key:value.'
    while yn('Would you like to add a file?') == 'y':
        filename = something('What\'s the filename?')
        fd = file(os.path.join(conf.dataDir, filename))
        counter = 1
        try:
            for line in fd:
                (key, value) = line.split(':', 1)
                counter += 1
        except ValueError:
            print 'That\'s not a valid file; line #%s is malformed.' % counter
            continue
        command = something('What would you like the command to be?')
        onStart.append('addlookup %s %s' % (command, filename))
    

example = utils.wrapLines("""
Add an example IRC session using this module here.
""")

def getDb():
    return sqlite.connect(os.path.join(conf.dataDir, 'Lookup.db'))

class Lookup(callbacks.Privmsg):
    def die(self):
        db = getDb()
        db.commit()
        db.close()
        del db

    def removelookup(self, irc, msg, args):
        """<name>

        Removes the lookup for <name>.
        """
        name = privmsgs.getArgs(args)
        db = getDb()
        cursor = db.cursor()
        try:
            cursor.execute("""DROP TABLE %s""" % name)
            db.commit()
            cb = irc.getCallback('Alias')
            if cb is not None:
                cb.removeAlias(name, evenIfFrozen=True)
            irc.reply(msg, conf.replySuccess)
        except sqlite.DatabaseError:
            irc.error(msg, 'No such lookup exists.')
    def addlookup(self, irc, msg, args):
        """<name> <filename>

        Adds a lookup for <name> with the key/value pairs specified in the
        colon-delimited file specified by <filename>.  <filename> is searched
        for in conf.dataDir.  Use 'lookup <name> <key>' to get the value of
        the key in the file.
        """
        (name, filename) = privmsgs.getArgs(args, needed=2)
        db = getDb()
        cursor = db.cursor()
        try:
            cursor.execute("""SELECT * FROM %s LIMIT 1""" % name)
            cb = irc.getCallback('Alias')
            if cb is not None:
                try:
                    cb.addAlias(irc, name, 'lookup %s $1' % name, freeze=True)
                except sys.modules[cb.__module__].AliasError, e:
                    pass
            irc.reply(msg, conf.replySuccess)
        except sqlite.DatabaseError:
            # Good, there's no such database.
            try:
                filename = os.path.join(conf.dataDir, filename)
                fd = file(filename)
            except OSError, e:
                irc.error('Could open %s: %s' % (filename, e))
                return
            cursor.execute("""CREATE TABLE %s (key TEXT, value TEXT)""" % name)
            sql = """INSERT INTO %s VALUES (%%s, %%s)""" % name
            for line in fd:
                line = line.rstrip('\r\n')
                try:
                    (key, value) = line.split(':', 1)
                except ValueError:
                    irc.error(msg, 'Invalid line in %s: %r' % (filename, line))
                cursor.execute(sql, key, value)
            cursor.execute("CREATE INDEX %s_keys ON %s (key)" % (name, name))
            db.commit()
            cb = irc.getCallback('Alias')
            if cb is not None:
                try:
                    cb.addAlias(irc, name, 'lookup %s $1' % name, freeze=True)
                except sys.modules[cb.__module__].AliasError, e:
                    irc.error(msg, str(e))
                    return
            irc.reply(msg, conf.replySuccess)

    def lookup(self, irc, msg, args):
        """<name> <key>

        Looks up the value of <key> in the domain <name>.
        """
        (name, key) = privmsgs.getArgs(args, needed=2)
        db = getDb()
        cursor = db.cursor()
        sql = """SELECT value FROM %s WHERE key LIKE %%s""" % name
        try:
            cursor.execute(sql, key)
        except sqlite.DatabaseError, e:
            if 'no such table' in str(e):
                irc.error(msg, 'I don\'t have a domain %s' % name)
            else:
                irc.error(msg, str(e))
            return
        if cursor.rowcount == 0:
            irc.reply(msg, 'I couldn\'t find %s in %s' % (key, name))
        elif cursor.rowcount == 1:
            irc.reply(msg, cursor.fetchone()[0])
        else:
            values = [t[0] for t in cursor.fetchall()]
            irc.reply(msg, '%s could be %s' % (key, ', or '.join(values)))
            
            

Class = Lookup

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