I've used [mmdc](https://github.com/mermaid-js/mermaid-cli https://github.com/mermaid-js/mermaid-cli) to generate mermaid images from a Makefile. It looks like

I've used [mmdc](https://github.com/mermaid-js/mermaid-cli https://github.com/mermaid-js/mermaid-cli) to generate mermaid images from a Makefile. It looks like it is implemented with puppeteer, so perhaps it doesn't quite fit your request. But if you just want something you can use at the cli, it is great.