A Pandoc filter for Graphviz

This filter provides Graphviz code block support.

Features

This filter changes the way to embed image according to the output format.
- For html, it embeds svg elements directly.
- For pdf/LaTeX, it embeds TikZ figures directly.
- For other formats, it saves png images in working directory and embeds their links.
The layout engine can be specified in block attributes.
For wrong inputs, it embeds the error message as a code block. pandoc command does not fail.

On Debian, you can install the required packages as follows:

$ sudo apt install pandoc graphviz dot2tex ghc libghc-utf8-string-dev libghc-sha-dev libghc-pandoc-dev

$ cd pandoc-filter-graphviz
$ ghc --make Main.hs -o pandoc-filter-graphviz

Note: -dynamic option is required in some environments.

You can skip this step if you do not use pdf/LaTeX.

Copy default template

$ mkdir -p ~/.pandoc/templates
$ pandoc -D latex > ~/.pandoc/templates/default.latex

Note, when you are using LaTeX beamer as target, replace the second command with:

$ pandoc -D beamer > ~/.pandoc/templates/default.beamer

Edit ~/.pandoc/templates/default.latex

...
\usepackage{tikz} % insert this line

\begin{document}
...

$ pandoc -F ./pandoc-filter-graphviz example.md -o example.html