[enh] new plugin: search on category select (currently only in oscar theme)

TODO
purge mootools from default/courgette and integrate jquery ++ this theme

searx/plugins/__init__.py

@@ -1,4 +1,5 @@
-from searx.plugins import self_ip
+from searx.plugins import (self_ip,
+                           search_on_category_select)
 from searx import logger
 from sys import exit
 
@@ -52,3 +53,4 @@ class PluginStore():
 
 plugins = PluginStore()
 plugins.register(self_ip)
+plugins.register(search_on_category_select)

searx/plugins/search_on_category_select.py

@@ -0,0 +1,6 @@
+from flask.ext.babel import gettext
+name = 'Search on category select'
+description = gettext('Perform search immediately if a category selected')
+default_on = False
+
+js_dependencies = ('js/search_on_category_select.js',)

searx/static/js/search_on_category_select.js

@@ -0,0 +1,14 @@
+$(document).ready(function() {
+    if($('#q')) {
+        $('#categories label').click(function(e) {
+            $('#categories input[type="checkbox"]').each(function(i, checkbox) {
+                $(checkbox).prop('checked', false);
+            });
+            $('#categories label').removeClass('btn-primary').removeClass('active').addClass('btn-default');
+            $(this).removeClass('btn-default').addClass('btn-primary').addClass('active');
+            $($(this).children()[0]).prop('checked', 'checked');
+            $('#search_form').submit();
+            return false;
+        });
+    }
+});