[enh] default settings option to autocomplete backend - #396

searx/settings.yml

 general:
     debug : False # Debug mode, only for development
 
+search:
+    safe_search : 0 # Filter results. 0: None, 1: Moderate, 2: Strict
+    autocomplete : "" # Existing autocomplete backends: "dbpedia", "duckduckgo", "google", "startpage", "wikipedia" - leave blank to turn it off by default
+
 server:
     port : 8888
     bind_address : "127.0.0.1" # address to listen on

searx/settings_robot.yml

 general:
     debug : False
 
+search:
+    safe_search : 0
+    autocomplete : 0
+
 server:
     port : 11111
     bind_address : 127.0.0.1

searx/webapp.py

 def render(template_name, override_theme=None, **kwargs):
     blocked_engines = get_blocked_engines(engines, request.cookies)
 
-    autocomplete = request.cookies.get('autocomplete')
+    autocomplete = request.cookies.get('autocomplete', settings['search']['autocomplete'])
 
     if autocomplete not in autocomplete_backends:
         autocomplete = None
         return '', 400
 
     # run autocompleter
-    completer = autocomplete_backends.get(request.cookies.get('autocomplete'))
+    completer = autocomplete_backends.get(request.cookies.get('autocomplete', settings['search']['autocomplete']))
 
     # parse searx specific autocompleter results like !bang
     raw_results = searx_bang(query)