Add warning when posting code to comments

templates/comments/media-js.html

@@ -217,6 +217,16 @@
                 $comment.find('.comment-body').show();
                 $comment.find('.bad-comment-body').hide();
             };
+
+            var code_regex = [/input\(/, /#include/, /void\s+main/, /fn\s+main/, /func\s+main/];
+            $(document).on('click', 'form.comment-submit-form .button[type=submit]', function (e) {
+                var text = $(this).parents('form').find('#id_body').val();
+                if (code_regex.some(function (regex) {return regex.test(text);})) {
+                    if (!confirm({{ _('Looks like you\'re trying to post a source code!\n\nThe comment section is not for posting source code.\nIf you want to submit your solution, please use the "Submit solution" button.\n\nAre you sure you want to post this?')|htmltojs }})) {
+                        e.preventDefault();
+                    }
+                }
+            });
         });
     </script>
 {% endcompress %}