manually merge https://github.com/claudehohl/Stikked/pull/329/files - thanks kylelaker!

htdocs/application/config/geshi_languages.php

@@ -120,6 +120,7 @@ $config['geshi_languages'] = array(
 	//'kixtart' => 'PHP',
 	'klonec' => 'KLone with C',
 	'klonecpp' => 'KLone with C++',
+	'kotlin' => 'Kotlin',
 	'latex' => 'LaTeX',
 	'lb' => 'Liberty BASIC',
 	'ldif' => 'LDIF',

htdocs/application/libraries/geshi/geshi/kotlin.php

@@ -0,0 +1,132 @@
+<?php
+/*************************************************************************************
+ * kotlin.php
+ * ----------
+ * Author: Brahimù Djoudi (jolkdarr@netscape.net)
+ * Copyright: (c) 2015 Brahim Djoudi
+ * Release Version: 1.0.0.0
+ * Date Started: 2015/11/02
+ *
+ * Kotlin language file for GeSHi.
+ *
+ * CHANGES
+ * -------
+ * 2015/11/02 (1.0.0.0)
+ *   -  First Release
+ *
+ *
+ *************************************************************************************
+ *
+ *     This file is part of GeSHi.
+ *
+ *   GeSHi is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   GeSHi is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with GeSHi; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ ************************************************************************************/
+
+$language_data = array (
+    'LANG_NAME' => 'Kotlin',
+    'COMMENT_SINGLE' => array(1 => '//'),
+    'COMMENT_MULTI' => array('/*' => '*/'),
+    'COMMENT_REGEXP' => array(),
+    'CASE_KEYWORDS' => GESHI_CAPS_NO_CHANGE,
+    'QUOTEMARKS' => array("'",'"'),
+    'ESCAPE_CHAR' => '\\',
+    'ESCAPE_REGEXP' => array(
+        // Simple Single Char Escapes
+        1 => "#\\\\[nfrtv\$\"\n\\\\]#i",
+        // Hexadecimal Char Specs
+        2 => "#\\\\x[\da-fA-F]{1,2}#i",
+        // Hexadecimal Char Specs (unicode)
+        3 => "#\\\\u[\da-fA-F]{1,4}#",
+        // Hexadecimal Char Specs (Extended Unicode)
+        4 => "#\\\\U[\da-fA-F]{1,8}#",
+        ),
+    'KEYWORDS' => array(
+        1 => array('package', 'file', 'import', 'as', 'is', 'class', 'interface', 'constructor', 'by',
+            'where', 'when', 'init', 'companion', 'object',
+            'val', 'var', 'fun', 'get', 'set', 'super', 'this', 'dynamic', 'if', 'else',
+            'try', 'catch', 'finally', 'for',  'while', 'do', 'in', 'out', 'true', 'false', 'null',
+            'throw', 'return', 'continue', 'break',
+            'abstract', 'final', 'enum', 'open', 'override', 'annotation',
+            'public', 'private', 'protected', 'internal'
+            ),
+        2 => array('Unit', 'Double', 'Float', 'Long', 'Int', 'Short', 'Byte', 'Boolean', 'Char', 'String')
+        ),
+    'SYMBOLS' => array(
+        '(', ')', '[', ']', '{', '}', '*', '<', '>', '?', '!',
+        'it', ':', '=', '->', '..', '::',
+         '$', '@'
+        ),
+    'CASE_SENSITIVE' => array(
+        GESHI_COMMENTS => false,
+        1 => true,
+        2 => true
+        ),
+    'STYLES' => array(
+        'KEYWORDS' => array(
+            1 => 'color: #0000ff; font-weight: bold;',
+            2 => 'color: #9999cc; font-weight: bold;',
+            ),
+        'COMMENTS' => array(
+            1 => 'color: #008000; font-style: italic;',
+            2 => 'color: #CC66FF;',
+            'MULTI' => 'color: #00ff00; font-style: italic;'
+            ),
+        'ESCAPE_CHAR' => array(
+            0 => 'color: #6666ff; font-weight: bold;',
+            1 => 'color: #6666ff; font-weight: bold;',
+            2 => 'color: #5555ff; font-weight: bold;',
+            3 => 'color: #4444ff; font-weight: bold;',
+            4 => 'color: #3333ff; font-weight: bold;'
+            ),
+        'BRACKETS' => array(
+            0 => 'color: #F78811;'
+            ),
+        'STRINGS' => array(
+            0 => 'color: #6666FF;'
+            ),
+        'NUMBERS' => array(
+            0 => 'color: #F78811;'
+            ),
+        'METHODS' => array(
+            1 => 'color: #000000;',
+            2 => 'color: #000000;'
+            ),
+        'SYMBOLS' => array(
+            0 => 'color: #000080;'
+            ),
+        'SCRIPT' => array(
+            ),
+        'REGEXPS' => array(
+            )
+        ),
+    'URLS' => array(
+        1 => 'https://kotlinlang.org/',
+        2 => ''
+        ),
+    'OOLANG' => true,
+    'OBJECT_SPLITTERS' => array(
+        1 => '.'
+        ),
+    'REGEXPS' => array(
+        ),
+    'STRICT_MODE_APPLIES' => GESHI_NEVER,
+    'SCRIPT_DELIMITERS' => array(
+        ),
+    'HIGHLIGHT_STRICT_BLOCK' => array(
+        )
+);
+
+?>