add duckduckgo search

ox/web/duckduckgo.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# vi:si:et:sw=4:sts=4:ts=4
+import re
+import urllib
+import ox
+from ox import stripTags, decodeHtml
+from ox.utils import json
+from ox.cache import readUrl
+
+
+def find(query, timeout=ox.cache.cache_timeout):
+    params = urllib.urlencode({'q': query})
+    url = 'http://duckduckgo.com/html/?' + params
+    print url
+    data = readUrl(url, timeout=timeout)
+    results = []
+    regex = '<a .*?class="l le" href="(.+?)">(.*?)</a>.*?<div class="cra">(.*?)</div>'
+    for r in re.compile(regex, re.DOTALL).findall(data):
+        results.append((stripTags(decodeHtml(r[1])), r[0], stripTags(decodeHtml(r[2]))))
+    return results
+