[enh] show categories not in any tab category in "Other" preferences tab

Previously we didn't have a good place to put search engines that don't
fit into any of the tab categories. This commit automatically puts
search engines that don't belong to any tab category in an "other"
category, that is only displayed in the user preferences (and not above
search results).

searx/engines/__init__.py

@@ -45,6 +45,9 @@ ENGINE_DEFAULT_ARGS = {
     "display_error_messages": True,
     "tokens": [],
 }
+# set automatically when an engine does not have any tab category
+OTHER_CATEGORY = 'other'
+
 """Defaults for the namespace of an engine module, see :py:func:`load_engine`"""
 
 categories = {'general': []}
@@ -114,6 +117,9 @@ def load_engine(engine_data):
 
     set_loggers(engine, engine_name)
 
+    if not any(cat in settings['categories_as_tabs'] for cat in engine.categories):
+        engine.categories.append(OTHER_CATEGORY)
+
     return engine
 
 
@@ -274,7 +280,7 @@ def group_engines_in_tab(engines):  # pylint: disable=redefined-outer-name
         return (group[0] == DEFAULT_GROUP_NAME, group[0].lower())
 
     def get_group(eng):
-        non_tab_engines = [c for c in eng.categories if c not in settings['categories_as_tabs']]
+        non_tab_engines = [c for c in eng.categories if c not in settings['categories_as_tabs'] + [OTHER_CATEGORY]]
         return non_tab_engines[0] if len(non_tab_engines) > 0 else DEFAULT_GROUP_NAME
 
     return [

searx/templates/oscar/preferences.html

@@ -298,7 +298,7 @@
             <div class="tab-pane active_if_nojs" id="tab_engine">
                 <!-- Nav tabs -->
                 <ul class="nav nav-tabs nav-justified hide_if_nojs" role="tablist">
-                    {% for categ in categories_as_tabs %}
+                    {% for categ in categories_as_tabs + [OTHER_CATEGORY] %}
                     <li{% if loop.first %} class="active"{% endif %}><a href="#tab_engine_{{ categ|replace(' ', '_') }}" role="tab" data-toggle="tab">{{ _(categ) }}</a></li>
                     {% endfor %}
                 </ul>
@@ -317,7 +317,7 @@
                         </p>
                     </div>
 
-                    {% for categ in categories_as_tabs %}
+                    {% for categ in categories_as_tabs + [OTHER_CATEGORY] %}
                     <noscript><label>{{ _(categ) }}</label>
                     </noscript>
                     <div class="tab-pane{% if loop.first %} active{% endif %} active_if_nojs" id="tab_engine_{{ categ|replace(' ', '_') }}">

searx/templates/simple/preferences.html

@@ -274,7 +274,7 @@
   {{ tab_header('maintab', 'engines', _('Engines')) }}
     <p>{{ _('Currently used search engines') }}</p>
     {{ tabs_open() }}
-    {% for categ in categories_as_tabs %}
+    {% for categ in categories_as_tabs + [OTHER_CATEGORY] %}
     {{ tab_header('enginetab', 'category' + categ, _(categ)) }}
     <div class="scrollx">
     <table class="striped">

searx/webapp.py

@@ -59,6 +59,7 @@ from searx.settings_defaults import OUTPUT_FORMATS
 from searx.settings_loader import get_default_settings_path
 from searx.exceptions import SearxParameterException
 from searx.engines import (
+    OTHER_CATEGORY,
     DEFAULT_GROUP_NAME,
     categories,
     engines,
@@ -182,6 +183,7 @@ _category_names = (
     gettext('software wikis'),
     gettext('web'),
     gettext(DEFAULT_GROUP_NAME),
+    gettext(OTHER_CATEGORY),
 )
 
 _simple_style = (gettext('auto'), gettext('light'), gettext('dark'))
@@ -439,6 +441,7 @@ def render(template_name, override_theme=None, **kwargs):
     kwargs['theme'] = get_current_theme_name(override=override_theme)
     kwargs['categories_as_tabs'] = settings['categories_as_tabs']
     kwargs['categories'] = _get_enable_categories(categories.keys())
+    kwargs['OTHER_CATEGORY'] = OTHER_CATEGORY
 
     # i18n
     kwargs['language_codes'] = [l for l in languages if l[0] in settings['search']['languages']]