Added postfix operators

Such as government-- and A350++

karma.py

-# Copyright © 2016 Bruce Cowan <bruce@bcowan.eu>
+# Copyright © 2016, 2018 Bruce Cowan <bruce@bcowan.eu>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -14,6 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from collections import defaultdict
+import re
 
 from errbot import BotPlugin, botcmd
 
@@ -26,11 +27,35 @@ class Karma(BotPlugin):
 
         self.karma = self.get('karma', defaultdict(int))
 
+        self.inc = re.compile(r'(.+)\+\+')
+        self.dec = re.compile(r'(.+)--')
+
     def deactivate(self):
         self['karma'] = self.karma
 
         super().deactivate()
 
+    def _inc_karma(self, target, message):
+        self.karma[target] += 1
+        text = "Karma for '{}' is now {}".format(target, self.karma[target])
+        self.send(message.to, text, message, True)
+
+    def _dec_karma(self, target, message):
+        self.karma[target] -= 1
+        text = "Karma for '{}' is now {}".format(target, self.karma[target])
+        self.send(message.to, text, message, True)
+
+    def callback_message(self, message):
+        # Increment?
+        match = self.inc.search(message.body)
+        if match:
+            self._inc_karma(match.group(1), message)
+
+        # Decrement?
+        match = self.dec.search(message.body)
+        if match:
+            self._dec_karma(match.group(1), message)
+
     @botcmd
     def karma_list(self, message, args):
         """Prints a list of karmaed things"""
@@ -46,8 +71,7 @@ class Karma(BotPlugin):
         if not args:
             return "**Usage**: !karma add <target>"
 
-        self.karma[args] += 1
-        return "Karma for '{}' is now {}".format(args, self.karma[args])
+        self._inc_karma(args, message)
 
     @botcmd
     def karma_remove(self, message, args):
@@ -55,8 +79,7 @@ class Karma(BotPlugin):
         if not args:
             return "**Usage**: !karma remove <target>"
 
-        self.karma[args] -= 1
-        return "Karma for '{}' is now {}".format(args, self.karma[args])
+        self._dec_karma(args, message)
 
     @botcmd
     def karma(self, message, args):