I am looking for command line utility to generate Gantt diagram from textual representation in **Graphviz** way or in the way that **Blockdiag** does. I'm aware of **Mermaid** and **NodeJS**, and I know that **Platuml** is planning to add Gantt diagram implementation.

I want to do something like:

    gantt source.txt > image.png

Is there any tool available now?