Improving Wolfram Alpha search hit content

Making WA search hits contain
- the (parsed) input inside the "title" instead of just "Wolfram|Alpha", to better match other hit titles and to confirm correct parsing of input to the user
- the first output field that contains any text (skipping ones that are only pictures; this is usually the most meaningful "result" field) instead of the raw input as the "content", making it additionally possible to obtain WA computations from JSON API calls

searx/engines/wolframalpha_api.py

 
 # xpath variables
 failure_xpath = '/queryresult[attribute::success="false"]'
-answer_xpath = '//pod[attribute::primary="true"]/subpod/plaintext'
 input_xpath = '//pod[starts-with(attribute::id, "Input")]/subpod/plaintext'
 pods_xpath = '//pod'
 subpods_xpath = './subpod'
     try:
         infobox_title = search_results.xpath(input_xpath)[0].text
     except:
-        infobox_title = None
+        infobox_title = ""
 
     pods = search_results.xpath(pods_xpath)
-    result = ""
     result_chunks = []
+    result_content = ""
     for pod in pods:
         pod_id = pod.xpath(pod_id_xpath)[0]
         pod_title = pod.xpath(pod_title_xpath)[0]
 
             if content and pod_id not in image_pods:
 
-                if pod_is_result:
-                    result = content
+                if pod_is_result or not result_content:
+                    if pod_id != "Input":
+                        result_content = "%s: %s" % (pod_title, content)
 
                 # if no input pod was found, title is first plaintext pod
                 if not infobox_title:
     if not result_chunks:
         return []
 
+    title = "Wolfram|Alpha (%s)" % infobox_title
+
     # append infobox
     results.append({'infobox': infobox_title,
                     'attributes': result_chunks,
 
     # append link to site
     results.append({'url': resp.request.headers['Referer'].decode('utf8'),
-                    'title': infobox_title + ' - Wolfram|Alpha',
-                    'content': result})
+                    'title': title,
+                    'content': result_content})
 
     return results