global: allow configuring channels to exempt from announcements

Closes #453.

example-conf.yml

@@ -815,6 +815,12 @@ stats:
     #     $text: the global text
     #format: "[$sender@$fullnetwork] $text"
 
+    # Configures a set of channel globs to exempt from announcements. You can also add to
+    # this per network via: servers::<server name>::global_exempt_channels,
+    # the contents of which will be merged into this list.
+    #exempt_channels:
+    #    - "#*staff*"
+
 #antispam:
     # This block configures the antispam plugin; you don't need this if you aren't using it.
     # Antispam is automatically enabled in all channels that it's in, and you can configure

plugins/global.py

@@ -23,14 +23,28 @@ def g(irc, source, args):
     global_conf = conf.conf.get('global') or {}
     template = string.Template(global_conf.get('format', DEFAULT_FORMAT))
 
-    for name, ircd in world.networkobjects.items():
+    exempt_channels = set(global_conf.get('exempt_channels', set()))
+    for netname, ircd in world.networkobjects.items():
         if ircd.connected.is_set():  # Only attempt to send to connected networks
             for channel in ircd.pseudoclient.channels:
+
+                local_exempt_channels = exempt_channels | set(ircd.serverdata.get('global_exempt_channels', set()))
+
+                skip = False
+                for exempt in local_exempt_channels:
+                    if irc.match_text(exempt, channel):
+                        log.debug('global: Skipping channel %s%s for exempt %r', netname, channel, exempt)
+                        skip = True
+                        break
+
+                if skip:
+                    continue
+
                 subst = {'sender': irc.get_friendly_name(source),
                          'network': irc.name,
                          'fullnetwork': irc.get_full_network_name(),
                          'current_channel': channel,
-                         'current_network': ircd.name,
+                         'current_network': netname,
                          'current_fullnetwork': ircd.get_full_network_name(),
                          'text': message}