C-Macs
oc
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C-Macs
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C-Macs – a pure C macOS application
It's open source but it is still under copyright. There are notices in the source file:
https://github.com/CodaFi/C-Macs/blob/master/CMacs/View.c#L5...
I would definitely ask permission and encourage the author to change the license before using this code.
Since API calls are purely functional and not covered by copyright you can mimic the behavior here but you'll need to rewrite everything from scratch, notably the most expressive parts, which are:
https://github.com/CodaFi/C-Macs/blob/master/CMacs/CMacsType...
https://github.com/CodaFi/C-Macs/blob/master/CMacs/CMacsType...
The organization and structure of this code is arbitrary and within the author's creative expression.
oc
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C-Macs – a pure C macOS application
Here's something similar by Garret Bass:
https://github.com/garettbass/oc
...I also experimented a bit with parsing macOS system headers via clang-ast-dump and then code-generating C and Zig APIs but that didn't get far:
https://github.com/floooh/objc-ast-experiments
...with a bit of effort and maybe using libclang instead of clang-ast-dump that's definitely feasible though.
I guess a similar approach is used by the official C++ bindings for Metal:
https://developer.apple.com/metal/cpp/
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Space-shooter.c: cross-platform, top-down 2D space shooter written in C
Metal can be called from C by going directly through the Objective-C runtime, but it requires either macro magic (like: https://github.com/garettbass/oc/), or code-generated C headers.
But it's not a big deal to move all the ObjC code into a separate .m source file and expose a smaller and higher level C API.