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diff --git a/external/markdown-processor.py b/external/markdown-processor.py
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+"""
+    The Pygments Markdown Preprocessor
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    This fragment is a Markdown_ preprocessor that renders source code
+    to HTML via Pygments.  To use it, invoke Markdown like so::
+
+        import markdown
+
+        html = markdown.markdown(someText, extensions=[CodeBlockExtension()])
+
+    This uses CSS classes by default, so use
+    ``pygmentize -S <some style> -f html > pygments.css``
+    to create a stylesheet to be added to the website.
+
+    You can then highlight source code in your markdown markup::
+
+        [sourcecode:lexer]
+        some code
+        [/sourcecode]
+
+    .. _Markdown: https://pypi.python.org/pypi/Markdown
+
+    :copyright: Copyright 2006-2022 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+# Options
+# ~~~~~~~
+
+# Set to True if you want inline CSS styles instead of classes
+INLINESTYLES = False
+
+
+import re
+
+from markdown.preprocessors import Preprocessor
+from markdown.extensions import Extension
+
+from pygments import highlight
+from pygments.formatters import HtmlFormatter
+from pygments.lexers import get_lexer_by_name, TextLexer
+
+
+class CodeBlockPreprocessor(Preprocessor):
+
+    pattern = re.compile(r'\[sourcecode:(.+?)\](.+?)\[/sourcecode\]', re.S)
+
+    formatter = HtmlFormatter(noclasses=INLINESTYLES)
+
+    def run(self, lines):
+        def repl(m):
+            try:
+                lexer = get_lexer_by_name(m.group(1))
+            except ValueError:
+                lexer = TextLexer()
+            code = highlight(m.group(2), lexer, self.formatter)
+            code = code.replace('\n\n', '\n&nbsp;\n').replace('\n', '<br />')
+            return '\n\n<div class="code">%s</div>\n\n' % code
+        joined_lines = "\n".join(lines)
+        joined_lines = self.pattern.sub(repl, joined_lines)
+        return joined_lines.split("\n")
+
+class CodeBlockExtension(Extension):
+    def extendMarkdown(self, md, md_globals):
+        md.preprocessors.add('CodeBlockPreprocessor', CodeBlockPreprocessor(), '_begin')