adding wikipedia plugin

plugins/sieve.py

@@ -24,6 +24,7 @@ def sieve_suite(bot, input, func, args):
     if input.re is None:
         return None
 
-    input.inp = ' '.join(input.re.groups())
+    input.inp = (' '.join(input.re.groups()) + 
+                input.msg[input.re.span()[1]:]).strip()
 
     return input

plugins/wikipedia.py

@@ -0,0 +1,46 @@
+#!/usr/bin/python
+'''Searches wikipedia and returns first sentence of article
+Scaevolus 2009'''
+
+import urllib
+from lxml import etree
+import re
+
+import hook
+
+api_prefix = "http://en.wikipedia.org/w/api.php"
+search_url = api_prefix + "?action=opensearch&search=%s&format=xml"
+
+paren_re = re.compile('\s*\(.*\)$')
+
+@hook.command(hook='w')
+@hook.command
+def wiki(query):
+    print query
+    q = search_url % (urllib.quote(query, safe=''))
+    print q
+    x = etree.parse(q)
+
+    ns = '{http://opensearch.org/searchsuggest2}'
+    items = x.findall(ns + 'Section/' + ns + 'Item')
+
+    def extract(item):
+        return [item.find(ns + x).text for x in 
+                            ('Text', 'Description', 'Url')]
+    
+    title, desc, url = extract(items[0])
+
+    if 'may refer to' in desc:
+        title, desc, url = extract(items[1])
+    
+    title = paren_re.sub('', title)
+
+    if title.lower() not in desc.lower():
+        desc = title + desc
+ 
+    desc = re.sub('\s+', ' ', desc).strip() #remove excess spaces
+
+    if len(desc) > 300:
+        desc = desc[:300] + '...'
+
+    return '%s -- %s' % (desc, url)