--- a/plugin.py	Thu Nov 22 15:27:58 2018 +0800
+++ b/plugin.py	Thu Nov 22 15:30:13 2018 +0800
@@ -59,9 +59,11 @@
         out, err = p.communicate()
         return (out.decode('utf-8'), err.decode('utf-8'))
 
-class Mercurial(callbacks.Plugin):
+class Mercurial(callbacks.PluginRegexp):
     """Goodies for #mercurial."""
     threaded = True
+    callBefore = ['URL', 'Web']
+    regexps = ['snarfDifferential', 'snarfDifferentialURL']
 
     def __init__(self, irc):
         super(Mercurial, self).__init__(irc)
@@ -180,4 +182,27 @@
         irc.reply(item)
     differential = wrap(differential, ['phabrev'])
 
+    def snarfDifferential(self, irc, msg, match):
+        r'\bD(?P<phabrev>\d+)\b'
+        channel = msg.args[0]
+        if not irc.isChannel(channel):
+            return
+
+        phabrev = match.group('phabrev')
+        self.differential(self, irc, msg, msg.args, phabrev)
+
+    @urlSnarfer
+    def snarfDifferentialURL(self, irc, msg, match):
+        r'\b(?P<url>https?://\S+/)D(?P<phabrev>\d+)\b'
+        channel = msg.args[0]
+        if not irc.isChannel(channel):
+            return
+
+        url = match.group('url')
+        if url.rstrip('/') != self.registryValue('phaburl').rstrip('/'):
+            return
+
+        phabrev = match.group('phabrev')
+        self.differential(self, irc, msg, msg.args, phabrev, gotURL=True)
+
 Class = Mercurial