Add warning when posting code to comments

templates/comments/list.html

@@ -146,7 +146,7 @@ <h3>{{ _('New comment') }}</h3>
                     {{ _('You must solve at least one problem before your voice can be heard.') }}
                 </div>
             {% else %}
-                <form class="comment-submit-form" action="" method="post">
+                <form class="comment-submit-form{% if comment_warn_code %} comment-warn-code{% endif %}" action="" method="post">
                     {% csrf_token %}
                     {% if comment_form.errors %}
                         <div id="form-errors">

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-warn-code .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 some 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 %}

templates/problem/problem.html

@@ -343,7 +343,9 @@ <h2><i class="fa fa-question-circle"></i> {{ _('Clarifications') }}</h2>
             {% endif %}
         </div>
     {% elif enable_comments %}
-        {% include "comments/list.html" %}
+        {% with comment_warn_code=true %}
+            {% include "comments/list.html" %}
+        {% endwith %}
     {% endif %}
 {% endblock %}