[find_updates] Add a module to check for updates

find_updates.py

@@ -0,0 +1,53 @@
+# coding=utf8
+"""
+find_updates.py - Update checking module for Willie.
+
+This is separated from version.py, so that it can be easily overridden by
+distribution packagers, and they can check their repositories rather than the
+Willie website.
+"""
+# Copyright 2014, Edward D. Powell, embolalia.net
+# Licensed under the Eiffel Forum License 2.
+from __future__ import unicode_literals
+
+import json
+import re
+
+import willie
+import willie.module
+import willie.web
+
+wait_time = 24 * 60 * 60  # check once per day
+startup_check_run = False
+version_url = 'http://willie.dftba.net/latest.json'
+message = (
+    'A new Willie version, {}, is available. I am running {}. Please update ' +
+    'me. Full release notes at {}.'
+)
+
+
+def parse_version(version):
+    return re.match('(\d+)\.(\d+)\.(\d+)(?:-\S+)?', version).groups()
+
+
+@willie.module.event('001')
+@willie.module.event('251')
+@willie.module.rule('.*')
+def startup_version_check(bot, trigger):
+    if not startup_check_run:
+        startup_check_run = True
+        check_version(bot)
+
+
+@willie.module.interval(wait_time)
+def check_version(bot):
+    version = parse_version(willie.__version__)
+
+    info = json.loads(willie.web.get(version_url))
+    latest = info['version']
+    notes = info['release_notes']
+    latest_version = parse_version(latest)
+
+    if version < latest_version:
+        bot.msg(bot.config.core.owner,
+                message.format(latest, willie.__version__, notes))