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If you are looking for a way to generate flowchart diagrams from a DSL description, the classic is Brian Kernighan's PIC: http://doc.cat-v.org/unix/v8/picmemo.pdf

I am surprised at the amount of people that have never heard of it. It is probably already installed on your Unix system. There are several implementations with various improvements, such as https://ece.uwaterloo.ca/~aplevich/dpic/

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Maybe it's just me, but if it takes more than five minutes, to figure out how to go from the example chart to a png, perhaps there's a reason no-one knows it.

This took quite some time to dig up. In case anyone else was wondering, this produces a png (assuming foo.pic contains the example pic instructions): $ pic foo.pic | pic2graph > foo.png

there was figr a web based realtime version.

I think it is dead now last known location http://figr.bzero.se

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