kompas3d/flake.nix

{
  description = "Kompas3D FHS wrapper";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
  };

  outputs = { self, nixpkgs }:
    let
      systems = [ "x86_64-linux" "aarch64-linux" ];
      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
    in
    {
      packages = forAllSystems (system:
        let
          pkgs = import nixpkgs { inherit system; config.allowUnfree = true; };

          kompas = pkgs.kdePackages.callPackage ./default.nix { };
          pname = "kompas3d-fhs";
        in
        {
          default = pkgs.buildFHSEnv rec {
            inherit pname;
            inherit (kompas) version;

            targetPkgs = pkgs': [
              kompas
              pkgs'.open-sans
            ];

            extraBuildCommands = ''
              mkdir -p $out/usr/local/
            '';

            extraBwrapArgs = [
              "--tmpfs" "/usr/local"
              "--bind-try" "/etc/nixos/" "/etc/nixos/"
            ];

            # symlink shared assets, including icons and desktop entries
            extraInstallCommands = ''
              ln -s "${kompas}/share" "$out/"
              ln -s "$out/bin/${pname}" "$out/bin/${kompas.meta.mainProgram}"
            '';

            profile = ''
              (
                custom_font_dir="/usr/local/share/fonts"
                if [ -d "$custom_font_dir" ]; then
                  echo "Font directory $custom_font_dir already exists, skipping font linking"
                  return 0
                fi
                echo "Start font linking inside FHS env cause kompas only checks /usr/{,local/}share/fonts/ dirs"
                mkdir -p "$custom_font_dir"
                for font in $(${pkgs.fontconfig}/bin/fc-list -f "%{file}\n" | sort -u | awk -F/ '{if (!seen[$NF]++) print $0}'); do
                  [ -L "$font" ] && font=$(readlink -f "$font")
                  relpath=$(dirname $(echo $font | sed 's|.*/share/fonts/||'))
                  target="$custom_font_dir/$relpath/"
                  mkdir -p "$target"
                  ln -s "$font" "$target"
                done
              )
            '';

            runScript = "${pkgs.bash}/bin/bash ${pkgs.writeText "kompas-wrapper" ''
              export QT_QPA_PLATFORM=xcb
              export QT_STYLE_OVERRIDE=Fusion
              cd /opt/ascon/kompas3d-v24/Bin/
              ./kKompas
            ''}";
          };
        });

      apps = forAllSystems (system: {
        default = {
          type = "app";
          program = "${self.packages.${system}.default}/bin/kompas3d-fhs";
        };
      });
    };
}