Add flake.nix

[MagicRB]

Adds flake.nix, allows for development on NixOS

[MagicRB]

I'm still testing this, please hold off on merging

[MagicRB]

This seems to work

[futu2]

I don't understand why it costs that lots of code.
How did the pkgs.haskellPackages.h-raylib works? It seems work well before ( broken in unstable now).
I am not very familiar with nix, but why system default drv works well, is anybody make a patch to it?
See NixOS/nixpkgs#197407

[MagicRB]

the problem is that h-raylib brings its own raylib and glfw. Which works well on other distros but is very un-NixOS-sy imo. Removing that simplifies packaging a lot.

[Anut-py]

I will have to update the git revision for raylib in flake.nix every time I pull the raylib source right?

[MagicRB]

Well if you keep tracking master, then probably. raylib in nixpkgs is too old and tracks stable releases.

[MagicRB]

there is no easy way to include a submodule. Nix doesn't do submodules.

[futu2]

there is no easy way to include a submodule. Nix doesn't do submodules.

Can nix flake fetch a raylib repo right in the ./. folder?
My simple callCabal2nix flake scripts run nix build successfully if delete git info by running mv .git .git.bk

[MagicRB]

yeah deleting .git is a horrible hack, nix just does not work with submodules.