Project Refactoring

[Andrew-Musa]

I performed a comprehensive analysis and refactoring of the Simula project to improve its structure, build process, and maintainability. This involved creating a new dedicated main scene, Simula.tscn, and updating the Godot project settings to use it, which provides a clearer entry point. I also improved the Nix build system by externalizing large, embedded shell scripts from flake.nix into a separate nix/ directory and corrected a bug in the justfile's watch command. Finally, I refactored the Haskell source code by reorganizing it into a more logical structure with a top-level Simula module and added extensive Haddock documentation to the most critical files to clarify their purpose and make the codebase easier to understand.

[haruki7049]

$ nix flake check -L
error: undefined variable 'passthru'
       at /home/haruki/program-dir/Simula/flake.nix:192:51:
          191|               makeWrapper $out/bin/simula-unwrapped $out/bin/simula \
          192|                 --prefix PATH : ${lib.makeBinPath passthru.simulaRuntimePrograms} \
             |                                                   ^
          193|                 --prefix LD_LIBRARY_PATH : ${lib.makeLibraryPath passthru.simulaRuntimeLibs}

Probably you can use nix flake check command. Please try it~

My environment is:

$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 6.12.53, NixOS, 25.11 (Xantusia), 25.11.20251018.3622652`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.31.2`
 - nixpkgs: `/nix/store/3qb1vcqah87n5hi5pd57m7jmjn78lpkb-source`