From 0c61d5d5d6199e5f5064e553a005cbc8e07aa97f Mon Sep 17 00:00:00 2001
From: Elijah Voigt <elijah.caine.mv@gmail.com>
Date: Mon, 23 Jun 2025 15:15:09 -0700
Subject: [PATCH] Pre-cargo initial commit

---
 .cargo/config.toml            | 28 ++++++++++++
 .direnv/bin/nix-direnv-reload | 19 ++++++++
 .envrc                        |  1 +
 flake.nix                     | 86 +++++++++++++++++++++++++++++++++++
 4 files changed, 134 insertions(+)
 create mode 100644 .cargo/config.toml
 create mode 100755 .direnv/bin/nix-direnv-reload
 create mode 100644 .envrc
 create mode 100644 flake.nix

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..08e581a
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,28 @@
+[unstable]
+codegen-backend = true
+
+[profile.dev]
+codegen-backend = "cranelift"
+
+[profile.dev.package."*"]
+codegen-backend = "llvm"
+
+[profile.release]
+lto = true
+opt-level = 'z'
+
+# for Linux
+[target.x86_64-unknown-linux-gnu]
+linker = "clang"
+rustflags = [
+  # (Nightly) Make the current crate share its generic instantiations
+  "-Zshare-generics=y",
+  # Link with Mold
+  "-C",
+  "link-arg=-fuse-ld=mold"
+]
+
+
+# for Windows
+[target.x86_64-pc-windows-msvc]
+linker = "rust-lld.exe"
diff --git a/.direnv/bin/nix-direnv-reload b/.direnv/bin/nix-direnv-reload
new file mode 100755
index 0000000..6b426f6
--- /dev/null
+++ b/.direnv/bin/nix-direnv-reload
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -e
+if [[ ! -d "/home/pop/Projects/src/localhost/games" ]]; then
+  echo "Cannot find source directory; Did you move it?"
+  echo "(Looking for "/home/pop/Projects/src/localhost/games")"
+  echo 'Cannot force reload with this script - use "direnv reload" manually and then try again'
+  exit 1
+fi
+
+# rebuild the cache forcefully
+_nix_direnv_force_reload=1 direnv exec "/home/pop/Projects/src/localhost/games" true
+
+# Update the mtime for .envrc.
+# This will cause direnv to reload again - but without re-building.
+touch "/home/pop/Projects/src/localhost/games/.envrc"
+
+# Also update the timestamp of whatever profile_rc we have.
+# This makes sure that we know we are up to date.
+touch -r "/home/pop/Projects/src/localhost/games/.envrc" "/home/pop/Projects/src/localhost/games/.direnv"/*.rc
diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..5f821b8
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,86 @@
+{
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    naersk.url = "github:nix-community/naersk";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    wild.url = "github:davidlattimore/wild";
+  };
+
+  outputs = { self, flake-utils, naersk, nixpkgs, rust-overlay, wild }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        systems = ["x86_64-linux"];
+        overlays = [
+          (import rust-overlay)
+          wild.overlays.default
+        ];
+        wildStdenv = pkgs.useWildLinker pkgs.stdenv;
+        pkgs = (import nixpkgs) {
+          inherit system overlays;
+          config.allowUnfree = true;
+        };
+        naersk' = pkgs.callPackage naersk { };
+        buildInputs = with pkgs; [
+          vulkan-loader
+          xorg.libXcursor
+          xorg.libXi
+          xorg.libXrandr
+          libxkbcommon
+          wayland
+          alsa-lib
+          udev
+          pkg-config
+          clang
+          lld
+          mold
+          binaryen
+        ];
+        nativeBuildInputs = with pkgs; [
+          libxkbcommon
+          (rust-bin.selectLatestNightlyWith (toolchain: toolchain.default.override {
+            extensions = [ "rust-src" "clippy" "rustc-codegen-cranelift-preview" ];
+            targets = [ "x86_64-unknown-linux-gnu" "wasm32-unknown-unknown" ];
+          }))
+        ];
+        all_deps = with pkgs; [
+          # cargo-expand
+          nixpkgs-fmt
+          cmake
+          wasm-pack
+          wasm-bindgen-cli
+          trunk
+          simple-http-server
+          zip
+          unzip
+          mdcat
+          rust-analyzer
+        ] ++ buildInputs ++ nativeBuildInputs;
+      in
+      rec {
+        # For `nix build` & `nix run`:
+        defaultPackage = packages.bevy_template { stdenv = wildStdenv; };
+        packages = rec {
+          bevy_template = naersk'.buildPackage {
+            src = ./.;
+            nativeBuildInputs = nativeBuildInputs;
+            buildInputs = buildInputs;
+            postInstall = ''
+              cp -r assets $out/bin/
+            '';
+            # Disables dynamic linking when building with Nix
+            cargoBuildOptions = x: x ++ [ "--no-default-features" ];
+          };
+        };
+
+        # For `nix develop`:
+        devShell = pkgs.mkShell.override { stdenv = wildStdenv; } {
+          nativeBuildInputs = all_deps;
+          shellHook = ''
+            export CARGO_MANIFEST_DIR=$(pwd)
+            export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${pkgs.lib.makeLibraryPath all_deps}"
+          '';
+        };
+      }
+    );
+}