[fix] urls merge in infobox (#593)

TODO:
    merge attributes

searx/engines/wikipedia.py

         return []
 
     # link to wikipedia article
-    # parenthesis are not quoted to make infobox mergeable with wikidata's
     wikipedia_link = url_lang(resp.search_params['language']) \
-        + 'wiki/' + quote(title.replace(' ', '_').encode('utf8')).replace('%28', '(').replace('%29', ')')
+        + 'wiki/' + quote(title.replace(' ', '_').encode('utf8'))
 
     results.append({'url': wikipedia_link, 'title': title})
 

searx/results.py

 
 
 def compare_urls(url_a, url_b):
-    if url_a.netloc != url_b.netloc or url_a.query != url_b.query:
+    # ignore www. in comparison
+    if url_a.netloc.startswith('www.'):
+        host_a = url_a.netloc.replace('www.', '', 1)
+    else:
+        host_a = url_a.netloc
+    if url_b.netloc.startswith('www.'):
+        host_b = url_b.netloc.replace('www.', '', 1)
+    else:
+        host_b = url_b.netloc
+
+    if host_a != host_b or url_a.query != url_b.query:
         return False
 
     # remove / from the end of the url if required
         urls1 = infobox1.get('urls', None)
         if urls1 is None:
             urls1 = []
-            infobox1['urls'] = urls1
 
-        urlSet = set()
-        for url in infobox1.get('urls', []):
-            urlSet.add(url.get('url', None))
+        for url2 in infobox2.get('urls', []):
+            unique_url = True
+            for url1 in infobox1.get('urls', []):
+                if compare_urls(urlparse(url1.get('url', '')), urlparse(url2.get('url', ''))):
+                    unique_url = False
+                    break
+            if unique_url:
+                urls1.append(url2)
 
-        for url in infobox2.get('urls', []):
-            if url.get('url', None) not in urlSet:
-                urls1.append(url)
+        infobox1['urls'] = urls1
 
     if 'img_src' in infobox2:
         img1 = infobox1.get('img_src', None)
         self.results = defaultdict(list)
         self._merged_results = []
         self.infoboxes = []
-        self._infobox_ids = {}
         self.suggestions = set()
         self.answers = set()
         self._number_of_results = []
         add_infobox = True
         infobox_id = infobox.get('id', None)
         if infobox_id is not None:
-            existingIndex = self._infobox_ids.get(infobox_id, None)
-            if existingIndex is not None:
-                merge_two_infoboxes(self.infoboxes[existingIndex], infobox)
-                add_infobox = False
+            for existingIndex in self.infoboxes:
+                if compare_urls(urlparse(existingIndex.get('id', '')), urlparse(infobox_id)):
+                    merge_two_infoboxes(existingIndex, infobox)
+                    add_infobox = False
 
         if add_infobox:
             self.infoboxes.append(infobox)
-            self._infobox_ids[infobox_id] = len(self.infoboxes) - 1
 
     def _merge_result(self, result, position):
         result['parsed_url'] = urlparse(result['url'])
             result['parsed_url'] = result['parsed_url']._replace(scheme="http")
             result['url'] = result['parsed_url'].geturl()
 
-        result['host'] = result['parsed_url'].netloc
-
-        if result['host'].startswith('www.'):
-            result['host'] = result['host'].replace('www.', '', 1)
-
         result['engines'] = [result['engine']]
 
         # strip multiple spaces and cariage returns from content