[enh] using the logger

searx/engines/__init__.py

 from flask.ext.babel import gettext
 from operator import itemgetter
 from searx import settings
+from searx import logger
+
+
+logger = logger.getChild('engines')
 
 engine_dir = dirname(realpath(__file__))
 
         if engine_attr.startswith('_'):
             continue
         if getattr(engine, engine_attr) is None:
-            print('[E] Engine config error: Missing attribute "{0}.{1}"'
+            logger.error('Missing engine config attribute: "{0}.{1}"'
                   .format(engine.name, engine_attr))
             sys.exit(1)
 
         categories['general'].append(engine)
 
     if engine.shortcut:
-        # TODO check duplications
         if engine.shortcut in engine_shortcuts:
-            print('[E] Engine config error: ambigious shortcut: {0}'
+            logger.error('Engine config error: ambigious shortcut: {0}'
                   .format(engine.shortcut))
             sys.exit(1)
         engine_shortcuts[engine.shortcut] = engine.name
 
 
 if 'engines' not in settings or not settings['engines']:
-    print '[E] Error no engines found. Edit your settings.yml'
+    logger.error('No engines found. Edit your settings.yml')
     exit(2)
 
 for engine_data in settings['engines']:

searx/https_rewrite.py

 from lxml import etree
 from os import listdir
 from os.path import isfile, isdir, join
+from searx import logger
 
 
+logger = logger.getChild("https_rewrite")
+
 # https://gitweb.torproject.org/\
 # pde/https-everywhere.git/tree/4.0:/src/chrome/content/rules
 
 def load_https_rules(rules_path):
     # check if directory exists
     if not isdir(rules_path):
-        print("[E] directory not found: '" + rules_path + "'")
+        logger.error("directory not found: '" + rules_path + "'")
         return
 
     # search all xml files which are stored in the https rule directory
         # append ruleset
         https_rules.append(ruleset)
 
-    print(' * {n} https-rules loaded'.format(n=len(https_rules)))
+    logger.info('{n} rules loaded'.format(n=len(https_rules)))
 
 
 def https_url_rewrite(result):

searx/search.py

 from searx.languages import language_codes
 from searx.utils import gen_useragent
 from searx.query import Query
+from searx import logger
 
 
+logger = logger.getChild('search')
+
 number_of_searches = 0
 
 
         engines[engine_name].stats['errors'] += 1
 
         # print engine name and specific error message
-        print('[E] Error with engine "{0}":\n\t{1}'.format(
+        logger.warning('engine crash: {0}\n\t{1}'.format(
             engine_name, str(e)))
         return
 
             remaining_time = max(0.0, timeout_limit - (time() - search_start))
             th.join(remaining_time)
             if th.isAlive():
-                print('engine timeout: {0}'.format(th._engine_name))
+                logger.warning('engine timeout: {0}'.format(th._engine_name))
 
 
 # get default reqest parameter

searx/webapp.py

 from searx.search import Search
 from searx.query import Query
 from searx.autocomplete import backends as autocomplete_backends
+from searx import logger
 
 
+logger = logger.getChild('webapp')
+
 static_path, templates_path, themes =\
     get_themes(settings['themes_path']
                if settings.get('themes_path')
 
 app.secret_key = settings['server']['secret_key']
 
+app.logger.addHandler(logger)
+
 babel = Babel(app)
 
 global_favicons = []