do splitting in DrBotServerConnection.privmsg

TODO

@@ -18,5 +18,4 @@ dr.botzo --- TODO
    * any interesting web service stuff?
    * obligatory info command
    * similar to FactFile module, a generic Trigger module
-   * do splitting in DrBotServerConnection.privmsg
    * settle on docstrings: http://www.python.org/dev/peps/pep-0257/

dr.botzo.py

@@ -17,6 +17,7 @@
 from ConfigParser import ConfigParser, NoSectionError, NoOptionError
 import os
 import re
+import socket
 import sys
 import inspect
 
@@ -34,8 +35,25 @@ class DrBotServerConnection(irclib.ServerConnection):
 
     def privmsg(self, target, text):
         # Send a PRIVMSG command.
-        # TODO: length limiting or splitting
-        self.send_raw("PRIVMSG %s :%s" % (target, text))
+        splitter = "..."
+
+        # split messages that are too long. Max length is 512.
+        # TODO: this does not properly handle when the hostname has been
+        # masked by the ircd
+        space = 512 - len('\r\n') - len('PRIVMSG ') - len(' :') - len(target) - len(self.nickname) - len('!') - len(self.username) - len('@') - len(socket.getfqdn())
+        splitspace = space - (len(splitter) + 1)
+
+        if len(text) > space:
+            while len(text) > splitspace:
+                splitpos = text.rfind(' ', 0, splitspace)
+                splittext = text[0:splitpos] + ' ' + splitter
+                text = splitter + ' ' + text[splitpos+1:]
+                self.send_raw("PRIVMSG %s :%s" % (target, splittext))
+
+            # done splitting
+            self.send_raw("PRIVMSG %s :%s" % (target, text))
+        else:
+            self.send_raw("PRIVMSG %s :%s" % (target, text))
 
 # DrBotIRC subclasses irclib's IRC, in order to create a DrBotServerConnection.