[enh] paging support

searx/engines/__init__.py

 for engine_data in settings['engines']:
     engine_name = engine_data['engine']
     engine = load_module(engine_name + '.py')
+    if not hasattr(engine, 'paging'):
+        engine.paging = False
     for param_name in engine_data:
         if param_name == 'engine':
             continue
     return sorted(results, key=itemgetter('score'), reverse=True)
 
 
-def search(query, request, selected_engines):
+def search(query, request, selected_engines, pageno=1):
     global engines, categories, number_of_searches
     requests = []
     results = {}
 
         engine = engines[selected_engine['name']]
 
+        if pageno > 1 and not engine.paging:
+            continue
+
         request_params = default_request_params()
         request_params['headers']['User-Agent'] = user_agent
         request_params['category'] = selected_engine['category']
         request_params['started'] = datetime.now()
+        request_params['pageno'] = pageno
         request_params = engine.request(query, request_params)
 
         callback = make_callback(

searx/static/css/style.css

 
 #results { margin: 10px; padding: 0; }
 
-#result_count { font-size: 0.8em; margin: 2px 0 2px 0; padding: 0 }
-
 #suggestions { position: absolute; left: 54em; width: 12em; margin: 0 2px 5px 5px; padding: 0 2px 2px 2px; }
 #suggestions span { display: block; font-size: 0.8em; margin: 0 2px 10px 2px; padding: 0; }
 #suggestions form { display: block; }

searx/templates/results.html

     {% endif %}
 
 
-    <div id ="result_count">
-        {{ _('Number of results') }}: {{ number_of_results }}
-    </div>
-
     {% for result in results %}
         {% if result['template'] %}
             {% include 'result_templates/'+result['template'] %}
             {% include 'result_templates/default.html' %}
         {% endif %}
     {% endfor %}
+
+    {% if paging %}
+    <div id="paging">
+        {% if pageno > 1 %}
+            <form method="post" action="/">
+                <div class="left">
+                <input type="hidden" name="q" value="{{ q }}" />
+                <input type="hidden" name="pageno" value="{{ pageno-1 }}" />
+                <input type="submit" value="<< {{ _('previous page') }}" />
+                </div>
+            </form>
+        {% endif %}
+        <form method="post" action="/">
+            <div class="left">
+            <input type="hidden" name="q" value="{{ q }}" />
+            <input type="hidden" name="pageno" value="{{ pageno+1 }}" />
+            <input type="submit" value="{{ _('next page') }} >>" />
+            </div>
+        </form>
+    </div>
+    {% endif %}
+
     <div id="apis">
       {{ _('Download results') }}
       <form method="post" action="/">

searx/webapp.py

 
 @app.route('/', methods=['GET', 'POST'])
 def index():
-    global categories
+    paging = False
 
     if request.method == 'POST':
         request_data = request.form
     if not request_data.get('q'):
         return render('index.html')
 
+    pageno_param = request_data.get('pageno', '1')
+    if not pageno_param.isdigit() or int(pageno_param) < 1:
+        return render('index.html')
+
+    pageno = int(pageno_param)
+
     selected_categories = []
 
     query, selected_engines = parse_query(request_data['q'].encode('utf-8'))
                                      'name': x.name}
                                     for x in categories[categ])
 
-    results, suggestions = search(query, request, selected_engines)
+    results, suggestions = search(query, request, selected_engines, pageno)
 
     featured_results = []
     for result in results:
+        if not paging and engines[result['engine']].paging:
+            paging = True
         if request_data.get('format', 'html') == 'html':
             if 'content' in result:
                 result['content'] = highlight_content(result['content'], query)
         results=results,
         q=request_data['q'],
         selected_categories=selected_categories,
-        number_of_results=len(results) + len(featured_results),
+        paging=paging,
+        pageno=pageno,
         featured_results=featured_results,
         suggestions=suggestions
     )