fix wikipedia engine and add comments

* add paging support
* make number_of_results changable
* make result calculation more clear
* add comments

searx/engines/wikipedia.py

@@ -1,30 +1,67 @@
+## Wikipedia (Web)
+# 
+# @website     http://www.wikipedia.org
+# @provide-api yes (http://www.mediawiki.org/wiki/API:Search)
+# 
+# @using-api   yes
+# @results     JSON
+# @stable      yes
+# @parse       url, title 
+#
+# @todo        content
+
 from json import loads
 from urllib import urlencode, quote
 
-url = 'https://{language}.wikipedia.org/'
-
-search_url = url + 'w/api.php?action=query&list=search&{query}&srprop=timestamp&format=json&sroffset={offset}'  # noqa
-
-number_of_results = 10
-
+# engine dependent config
+categories = ['general']
 language_support = True
+paging = True
+number_of_results = 1
+    
+# search-url
+url = 'https://{language}.wikipedia.org/'
+search_url = url + 'w/api.php?action=query&list=search&{query}&srprop=timestamp&format=json&sroffset={offset}&srlimit={limit}'  # noqa
 
 
+# do search-request
 def request(query, params):
-    offset = (params['pageno'] - 1) * 10
+    offset = (params['pageno'] - 1) * number_of_results
+
     if params['language'] == 'all':
         language = 'en'
     else:
         language = params['language'].split('_')[0]
+    
+    # write search-language back to params, required in response
     params['language'] = language
+
     params['url'] = search_url.format(query=urlencode({'srsearch': query}),
                                       offset=offset,
+                                      limit=number_of_results,
                                       language=language)
+
     return params
 
 
+# get response from search-request
 def response(resp):
+    results = []
+
     search_results = loads(resp.text)
-    res = search_results.get('query', {}).get('search', [])
-    return [{'url': url.format(language=resp.search_params['language']) + 'wiki/' + quote(result['title'].replace(' ', '_').encode('utf-8')),  # noqa
-        'title': result['title']} for result in res[:int(number_of_results)]]
+
+    # return empty array if there are no results
+    if not search_results.get('query', {}).get('search'):
+        return []
+
+    # parse results
+    for result in search_results['query']['search']:
+        res_url = url.format(language=resp.search_params['language']) + 'wiki/' + quote(result['title'].replace(' ', '_').encode('utf-8'))
+        
+        # append result
+        results.append({'url': res_url,
+                        'title': result['title'],
+                        'content': ''})
+
+    # return results
+    return results

searx/settings.yml

@@ -11,9 +11,8 @@ server:
 engines:
   - name : wikipedia
     engine : wikipedia
-    number_of_results : 1
-    paging : False
     shortcut : wp
+#    number_of_results : 1 # default is 1
 
   - name : bing
     engine : bing