Feature request: Add support for Pikchr

[arthurbarr]

Could you please consider adding support for Pikchr?

[ggrossetie]

Hey @arthurbarr
I actually did consider Pikchr but I couldn't find a pre-built binary. It was also unclear how to get the sources of this project: https://pikchr.org/home/dir?ci=tip 🤔

Any idea?

[arthurbarr]

It appears to be using Fossil for source code management. You can get the source doing something like this:

fossil clone https://pikchr.org pikchr
fossil open ./pikchr

I don't think there's a pre-built version, as it's just a single C file, with a single function as the entrypoint. So integrating would appear to mean pulling down the latest C file, and then invoking the C function from kroki.

[arthurbarr]

Additional docs on building Pikchr from source and how to integrate Pikchr into new systems

[bugsbugsbux]

@arthurbarr i found that fossil complains with your approach of opening the repo. its easier to just create a new folder for the checkout:

fossil clone https://pikchr.org pikchr
mkdir pikchr-checkout
cd pikchr-checkout
fossil open ../pikchr

but there's actually no need to use fossil at all:
just get the preprocessed c file from https://pikchr.org/home/file/pikchr.c
and compile as the Makefile says:
gcc -O0 -g -Wall -Wextra -DPIKCHR_SHELL pikchr.c -o pikchr -lm

[ggrossetie]

For reference, Pikchr now has an official GitHub mirror: https://github.com/drhsqlite/pikchr

but there's actually no need to use fossil at all:
just get the preprocessed c file from pikchr.org/home/file/pikchr.c
and compile as the Makefile says:
gcc -O0 -g -Wall -Wextra -DPIKCHR_SHELL pikchr.c -o pikchr -lm

I can confirm that the following is working fine, thanks 👍

Now the only blocker is that the CLI does not seem to read diagram from stdin (and I don't want to write temporary files on the disk). I never wrote C code but I will see what I can do...

If someone is familiar with C and/or knows how to implement this feature please come forward! The entry point seems to be: https://github.com/drhsqlite/pikchr/blob/91f0247783fc7ae7941f3ec5dd9747518c345b91/pikchr.c#L7716

[ggrossetie]

Gave it a try: drhsqlite/pikchr#1