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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 Plantuml is planning to add Gantt diagram implementation.

Something similar is possible achieve using Gnuplot, but the syntax is quite specific and complex (have a look at this example)

I want to do something like:

gantt source.txt > image.png

Is there any tool available now?

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I don't see any reason why https://github.com/mermaidjs/mermaid.cli wouldn't work in your case. MIT licensed, it should allow you to save this into gantt.txt

gantt
    title A Gantt Diagram
    dateFormat  YYYY-MM-DD
    section Section
    A task           :a1, 2014-01-01, 30d
    Another task     :after a1  , 20d
    section Another
    Task in sec      :2014-01-12  , 12d
    another task      : 24d

And this should give you the picture

mmdc -i gantt.txt -o image.png

mermaid gantt

The Blockdiag you've mentioned is also a Python library, and you could make a command line script with it.

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