Asciidoctor PDF Theming
Asciidoctor PDF comes with a built-in theming system and a default theme. The theming system is used to control the layout and styling of a PDF file generated from AsciiDoc by Asciidoctor PDF. You can use the default theme for your PDFs as it is, extend the default theme to change or add styles, or create and apply a custom theme.
The Asciidoctor PDF theming system is driven by a YAML configuration file. The Asciidoctor PDF theme language is described using YAML and incorporates many concepts from CSS and SASS, such as selectors, properties, and inheritance. Therefore, if you have a background in web design, the terminology should be immediately familiar to you. Note, however, that the theming system isn’t actually CSS.
The theme can generally influence PDF settings, page numbering, font properties, background and borders, character selections, spacings, and running content. It has limited influence over the layout of elements on the page. If your theming requirements demand more than what this theming system can accommodate, you can extend the converter to gain more control over the layout and style.
You can use the built-in theme files, which you can find in the data/themes directory, as examples.
If you’ve enabled a source highlighter, you can control the style (aka theme) it applies to source blocks using the
rouge-style attributes, respectively.
For example, to configure Rouge to use the built-in monokai theme, run Asciidoctor PDF as follows:
$ asciidoctor-pdf -a rouge-style=monokai basic-example.adoc
It’s possible to develop your own theme for Rouge. Refer to Source Highlighting Themes for details.