browser-3d-environment/flake.nix

{
  description = "3D demo";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    crane.url = "github:ipetkov/crane";
    flake-utils.url = "github:numtide/flake-utils";
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = {
    self,
    nixpkgs,
    crane,
    flake-utils,
    rust-overlay,
  }:
    flake-utils.lib.eachDefaultSystem (
      system: let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [(import rust-overlay)];
        };

        inherit (pkgs) lib;

        rustToolchainFor = p:
          p.rust-bin.stable.latest.default.override {
            # Set the build targets supported by the toolchain,
            # wasm32-unknown-unknown is required for trunk
            targets = ["wasm32-unknown-unknown"];
          };
        craneLib = (crane.mkLib pkgs).overrideToolchain rustToolchainFor;

        # When filtering sources, we want to allow assets other than .rs files
        unfilteredRoot = ./.; # The original, unfiltered source
        src = lib.fileset.toSource {
          root = unfilteredRoot;
          fileset = lib.fileset.unions [
            # Default files from crane (Rust and cargo files)
            (craneLib.fileset.commonCargoSources unfilteredRoot)
            (lib.fileset.fileFilter (
                file:
                  lib.any file.hasExt [
                    "html"
                    "scss"
                    "wgsl"
                  ]
              )
              unfilteredRoot)
            # Example of a folder for images, icons, etc
            (lib.fileset.maybeMissing ./assets)
          ];
        };

        # Common arguments can be set here to avoid repeating them later
        commonArgs = {
          inherit src;
          strictDeps = true;
          # We must force the target, otherwise cargo will attempt to use your native target
          CARGO_BUILD_TARGET = "wasm32-unknown-unknown";

          buildInputs =
            [
              # Add additional build inputs here
            ]
            ++ lib.optionals pkgs.stdenv.isDarwin [
              # Additional darwin specific inputs can be set here
              pkgs.libiconv
            ];
        };

        # Build *just* the cargo dependencies, so we can reuse
        # all of that work (e.g. via cachix) when running in CI
        cargoArtifacts = craneLib.buildDepsOnly (
          commonArgs
          // {
            # You cannot run cargo test on a wasm build
            doCheck = false;
          }
        );

        # Build the actual crate itself, reusing the dependency
        # artifacts from above.
        # This derivation is a directory you can put on a webserver.
        my-app = craneLib.buildTrunkPackage (
          commonArgs
          // {
            inherit cargoArtifacts;
            # The version of wasm-bindgen-cli here must match the one from Cargo.lock.
            # When updating to a new version replace the hash values with lib.fakeHash,
            # then try to do a build, which will fail but will print out the correct value
            # for `hash`. Replace the value and then repeat the process but this time the
            # printed value will be for the second `hash` below
            wasm-bindgen-cli = pkgs.wasm-bindgen-cli_0_2_108;
          }
        );

        # Quick example on how to serve the app,
        # This is just an example, not useful for production environments
        serve-app = pkgs.writeShellScriptBin "serve-app" ''
          ${pkgs.python3Minimal}/bin/python3 -m http.server --directory ${my-app} 8080
        '';
      in {
        checks = {
          # Build the crate as part of `nix flake check` for convenience
          inherit my-app;

          # Run clippy (and deny all warnings) on the crate source,
          # again, reusing the dependency artifacts from above.
          #
          # Note that this is done as a separate derivation so that
          # we can block the CI if there are issues here, but not
          # prevent downstream consumers from building our crate by itself.
          my-app-clippy = craneLib.cargoClippy (
            commonArgs
            // {
              inherit cargoArtifacts;
              cargoClippyExtraArgs = "--all-targets -- --deny warnings";
            }
          );

          # Check formatting
          my-app-fmt = craneLib.cargoFmt {
            inherit src;
          };
        };

        packages.default = my-app;

        apps.default = flake-utils.lib.mkApp {
          drv = serve-app;
        };

        devShells.default = craneLib.devShell {
          # Inherit inputs from checks.
          checks = self.checks.${system};

          # Additional dev-shell environment variables can be set directly
          # MY_CUSTOM_DEVELOPMENT_VAR = "something else";

          # Extra inputs can be added here; cargo and rustc are provided by default.
          packages = [
            pkgs.trunk
          ];
        };
      }
    );
}