[bug#50052] [PATCH] Add prusa-slicer

[Ivan Gankevich]

> Hi! I'm Daniel Trujillo,

Hello, Daniel!


> I don't know if these kind of packages are of interest, but this is 
> PrusaSlicer [0], a software to prepare 3D printings (hence I put it in 
> engineering.scm).

I have submitted “prusa-slicer” together with “libigl” on July 23 but did’t get 
any
response: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=49713

We should probably check prior submissions to not duplicate our effort.


> The packaged version, 2.3.3 is the latest stable available at this 
> moment. But this version has as important problem [1]: It cannot be 
> invoked just naming the executable (through $PATH), because then, it 
> can't locate the resources directory. I learned **the hard way** that 
> the fix was applied *after* the release of the 2.3.3 version, so I 
> decided to backport the fix adding a patch because it's a show-stopper 
> to have to type the path to the executable in /gnu/store/... That's 
> the reason why the patch attached to this email contains, not only the 
> additions to engineering.scm, but also a patch that implements the 
> solution in the version 2.3.3 codebase (It's quite simple, it uses a 
> boost function to determine the path to the executable rather than 
> relying on argv[0]).

This issue is fixed by adding “-DSLIC3R_FHS=1” to #:configure-flags.
No need to patch the source code.


> * In order for the above $PATH issue fix to work, it's crucial that 
> the cmake variable SLIC3R_FHS is set to off. This is the default value 
> according to the CMakeLists.txt, but because it's so important, 
> probably it should have been included in the configure-flags argument? 
> Just for clarity.

Set it to ON and you don’t have to patch the code.


> I hope everything is in order, I'm looking forward to see your 
> comments, and hope I can start contributing more packages to Guix!!

Prusa slicer bundles a lot of third-party libraries. Most of them contain
prusa-specific modifications, but some don’t. “libigl”, “eigen” and “hidapi” 
can be
unbundled, so that we can use versions of these libraries provided by Guix.

> +         ("cereal" ,cereal)

You need to patch “cereal” library definition in order for Prusa slicer to find
this library. I have included this in my patch as well.


Regards,
Ivan