--- a/config.py	Thu Nov 22 14:40:59 2018 +0800
+++ b/config.py	Thu Nov 22 15:27:58 2018 +0800
@@ -57,3 +57,7 @@
 conf.registerGlobalValue(Mercurial.repos, 'hg-all',
                          registry.String('/home/hg/repos/hg-all',
                                          """Path to the hg-all repo."""))
+
+conf.registerGlobalValue(Mercurial, 'phaburl',
+                         registry.String('https://phab.mercurial-scm.org',
+                                         """URL of the phabricator instance."""))

--- a/plugin.py	Thu Nov 22 14:40:59 2018 +0800
+++ b/plugin.py	Thu Nov 22 15:27:58 2018 +0800
@@ -32,15 +32,21 @@
 from supybot.commands import *
 
 import os
+import re
 import subprocess
 
 def revparse(irc, msg, args, state):
     if ':' in args[0]:
-        state.errorInvalid('revision', args[0],
-                           'Contains ":".')
+        state.errorInvalid('revision', args[0], 'Contains ":".')
     state.args.append(args.pop(0))
 addConverter('revision', revparse)
 
+def phabrevparse(irc, msg, args, state):
+    if args[0].startswith('D'):
+        args[0] = args[0][1:]
+    callConverter('positiveInt', irc, msg, args, state)
+addConverter('phabrev', phabrevparse)
+
 class Hg(object):
     def __init__(self, path):
         self.path = path
@@ -150,4 +156,28 @@
             irc.reply('no match found')
     glossary = wrap(glossary, ['text'])
 
+    def differential(self, irc, msg, args, phabrev, gotURL=False):
+        """<revision id>
+
+        Returns URL, description and status of revisions on differential."""
+        baseurl = self.registryValue('phaburl')
+        url = '{}/D{}'.format(baseurl.rstrip('/'), phabrev)
+        page = utils.web.getUrl(url).decode('utf-8')
+
+        status = 'Status N/A'
+        desc = 'Description N/A'
+        match = re.search(r'<div class="phui-header-subheader">.*?</span>(?P<status>[^<]+?)</span>', page)
+        if match:
+            status = utils.web.htmlToText(match.group('status'))
+        match = re.search(r'<span class="phui-header-header">.*?</span>(?P<desc>[^<]+?)</span>', page)
+        if match:
+            desc = utils.web.htmlToText(match.group('desc'))
+
+        if gotURL:
+            url = 'D{}'.format(phabrev)
+
+        item = 'Revision {} {}, {}'.format(url, status, desc)
+        irc.reply(item)
+    differential = wrap(differential, ['phabrev'])
+
 Class = Mercurial

--- a/test.py	Thu Nov 22 14:40:59 2018 +0800
+++ b/test.py	Thu Nov 22 15:27:58 2018 +0800
@@ -50,4 +50,13 @@
         self.assertNotError('main null')
         self.assertHelp('main')
 
+    def testDifferential(self):
+        self.assertResponse('differential 3850',
+                            'Revision https://phab.mercurial-scm.org/D3850'
+                            ' Closed, stringutil: update list of re-special characters to include &~')
+        self.assertResponse('differential D5194',
+                            'Revision https://phab.mercurial-scm.org/D5194'
+                            ' Abandoned, wireprotov2: add an extension to cache wireproto v2 responses in S3')
+        self.assertHelp('differential')
+
 # vim:set shiftwidth=4 tabstop=4 expandtab textwidth=79: