add language support for qwant

closes issue #863

searx/engines/qwant.py

@@ -20,6 +20,7 @@ from searx.utils import html_to_text
 categories = None
 paging = True
 language_support = True
+supported_languages_url = 'https://qwant.com/region'
 
 category_to_keyword = {'general': 'web',
                        'images': 'images',
@@ -46,6 +47,13 @@ def request(query, params):
 
     # add language tag if specified
     if params['language'] != 'all':
+        if params['language'].find('-') < 0:
+            # tries to get a country code from language
+            for lang in supported_languages:
+                lc = lang.split('-')
+                if params['language'] == lc[0]:
+                    params['language'] = lang
+                    break
         params['url'] += '&locale=' + params['language'].replace('-', '_').lower()
 
     return params
@@ -96,5 +104,21 @@ def response(resp):
                             'publishedDate': published_date,
                             'content': content})
 
-    # return results
     return results
+
+
+# get supported languages from their site
+def _fetch_supported_languages(resp):
+    # list of regions is embedded in page as a js object
+    response_text = resp.text
+    response_text = response_text[response_text.find('regionalisation'):]
+    response_text = response_text[response_text.find('{'):response_text.find(');')]
+
+    regions_json = loads(response_text)
+
+    supported_languages = []
+    for lang in regions_json['languages'].values():
+        for country in lang['countries']:
+            supported_languages.append(lang['code'] + '-' + country)
+
+    return supported_languages