Irc: allow defaulting to private command replies (Closes #409)

Squashed commit of the following:

commit c168500235b65f833b1d7fe49ebde674159683ee
Author: James Lu <GLolol@overdrivenetworks.com>
Date:   Thu Feb 16 17:33:36 2017 -0800

    ServiceBot: default notice and private to None

    This is so that it respects the changes from the last commit.

commit f685f3ef522f7f0ee356082c3c1b8b5a4e34b211
Author: James Lu <GLolol@overdrivenetworks.com>
Date:   Thu Feb 16 15:10:33 2017 -0800

    Irc: implement a prefer_private_replies option (#409)

classes.py

@@ -524,6 +524,10 @@ class Irc():
             loopback=True):
         """Replies to the last caller in the right context (channel or PM)."""
 
+        if private is None:
+            # Allow using private replies as the default, if no explicit setting was given.
+            private = conf.conf['bot'].get("prefer_private_replies")
+
         # Private reply is enabled, or the caller was originally a PM
         if private or (self.called_in in self.users):
             if not force_privmsg_in_private:

example-conf.yml

@@ -45,6 +45,10 @@ bot:
     # of all database-enabled plugins to take effect.
     save_delay: 300
 
+    # Determines whether services should default to sending command responses as private notices,
+    # even if the command was called in a channel. This defaults to False.
+    #prefer_private_replies: false
+
 login:
     # NOTE: for users migrating from PyLink < 1.1, the old login:user/login:password settings
     # have been deprecated. We strongly recommend migrating to the new "accounts:" block below, as

utils.py

@@ -284,7 +284,7 @@ class ServiceBot():
             else:
                 log.warning('(%s) Ignoring invalid autojoin channel %r.', irc.name, chan)
 
-    def reply(self, irc, text, notice=False, private=False):
+    def reply(self, irc, text, notice=None, private=None):
         """Replies to a message as the service in question."""
         servuid = self.uids.get(irc.name)
         if not servuid:
@@ -293,7 +293,7 @@ class ServiceBot():
 
         irc.reply(text, notice=notice, source=servuid, private=private)
 
-    def error(self, irc, text, notice=False, private=False):
+    def error(self, irc, text, notice=None, private=None):
         """Replies with an error, as the service in question."""
         servuid = self.uids.get(irc.name)
         if not servuid: