Limnoria/plugins/Lookup.py

#!/usr/bin/env python

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

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

import plugins

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 FileLookup')
    print 'This module allows you to define commands that do a simple key'
    print 'lookup and return some simple value.  It has a command "add"'
    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?')
        try:
            fd = file(os.path.join(conf.dataDir, filename))
        except OSError, e:
            print 'I couldn\'t open that file: %s' % e
            continue
        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('lookup add %s %s' % (command, filename))
    

example = utils.wrapLines("""
<jemfinch> @lookup add areacode areacodes.supyfact
<supybot> jemfinch: The operation succeeded.
<jemfinch> @areacode 513
<supybot> jemfinch: SW Ohio: Cincinnati (see split 937; overlay 283 cancelled)
<jemfinch> @areacode 937
<supybot> jemfinch: SW Ohio: Dayton (part of what used to be 513)
<jemfinch> @lookup remove areacode
<supybot> jemfinch: The operation succeeded.
<jemfinch> @areacode 513
<jemfinch> (note there is no response; the command doesn't exist anymore)
<jemfinch> @lookup add areacode areacodes.supyfact
<supybot> jemfinch: The operation succeeded.
<jemfinch> @lookup add deepthought deepthoughts.supyfact
<supybot> jemfinch: The operation succeeded.
<jemfinch> (deepthought maps numbers to deep thoughts by Jack Handy; if a lookup isn't given an argument, it'll return a random key: value pair.  That's useful for something like this.)
<jemfinch> @deepthought
<supybot> jemfinch: 272: I guess the hard thing for a lot of people to accept is why God would allow me to go running through their yards, yelling and spinning around.
""")

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

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

    def remove(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 add(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:
                if line.startswith('#'):
                    continue
                line = line.rstrip('\r\n')
                try:
                    (key, value) = line.split(':', 1)
                except ValueError:
                    irc.error(msg, 'Invalid line in %s: %r' % (filename, line))
                    return
                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, optional=1)
        db = getDb()
        cursor = db.cursor()
        if key:
            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)))
        else:
            sql = """SELECT key, value FROM %s
                     ORDER BY random() LIMIT 1""" % name
            try:
                cursor.execute(sql)
            except sqlite.DatabaseError, e:
                if 'no such table' in str(e):
                    irc.error(msg, 'I don\'t have a domain %r' % name)
                else:
                    irc.error(msg, str(e))
                return
            (key, value) = cursor.fetchone()
            irc.reply(msg, '%s: %s' % (key, value))
            
            
Class = Lookup

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