[mod] new plugin: Autodetect search language

requirements.txt

@@ -16,3 +16,4 @@ setproctitle==1.3.2
 redis==4.4.0
 markdown-it-py==2.1.0
 typing_extensions==4.4.0
+fasttext==0.9.2

searx/plugins/autodetect_search_language.py

@@ -0,0 +1,19 @@
+import fasttext
+import os
+from flask_babel import gettext
+
+name = gettext('Autodetect search language')
+description = gettext('Automatically detect the query search language and switch to it.')
+preference_section = 'general'
+default_on = False
+
+
+fasttext.FastText.eprint = lambda x: None
+model = fasttext.load_model(os.path.dirname(os.path.realpath(__file__)) + '/../data/lid.176.ftz')
+
+
+def pre_search(request, search):
+    lang = model.predict(search.search_query.query, k=1)
+    if lang[1][0] >= 0.3:
+        search.search_query.lang = lang[0][0].split('__label__')[1]
+    return True

searx/settings.yml

@@ -196,6 +196,7 @@ outgoing:
 #   - 'Open Access DOI rewrite'
 #   - 'Vim-like hotkeys'
 #   - 'Tor check plugin'
+#   - 'Autodetect search language'
 
 # Configuration of the "Hostname replace" plugin:
 #