Create diagram images from text commands

https://plantuml.com/ + https://pandoc.org/ (other similar tools)

 https://graphviz.org/doc/info/command.html

Ex: echo 'digraph { a -> b }' | dot -Tsvg > output.svg

echo 'digraph { a -> b }' | dot -Tsvg -Gfontcolor=red -Glabel="My favorite letters"