Import into git

Containerfile

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+FROM gitea/gitea:1.21
+RUN apk --no-cache add asciidoctor ruby-rouge
+COPY extended_rouge.rb /opt/extended_rouge.rb

README.asciidoc

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+= Gitea modifications
+
+My modifications on Gitea for use on my https://gitea.adaedra.eu/[instance].
+
+Currently only adds support for Asciidoc documents with syntax highlighting.

app.ini

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+; Append to your own app.ini
+
+[markup.sanitizer.chroma]
+ELEMENT = pre
+ALLOW_ATTR = class
+REGEXP = ^chroma$
+
+[markup.asciidoc]
+ENABLED = true
+FILE_EXTENSIONS = .adoc,.asciidoc
+RENDER_COMMAND = "asciidoctor -r /opt/extended_rouge -s -a showtitle -a source-highlighter=rouge --out-file=- -"
+IS_INPUT_FILE = false

extended_rouge.rb

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+class ExtendedRougeSyntaxHighlighter < (Asciidoctor::SyntaxHighlighter.for 'rouge')
+  register_for 'rouge'
+
+  def format(_node, _lang, opts)
+    opts[:transform] = proc do |pre, code|
+      pre['class'] = 'chroma'
+    end
+
+    super
+  end
+end