Add reproducible Nix development environment

.gitignore

@@ -1,5 +1,6 @@
 DejaVuSansMono.ttf
 build/
+build-linux/
 bin/
 *.d
 *.exe

CMakeLists.txt

@@ -2,6 +2,13 @@ cmake_minimum_required(VERSION 3.7)
 
 project(NevolutionX)
 
+configure_file(sampleconfig.json config.json COPYONLY)
+
+foreach(runtime_file IN ITEMS Resources/480.png Resources/720.png Resources/vegur.ttf)
+  get_filename_component(runtime_name "${runtime_file}" NAME)
+  configure_file("${runtime_file}" "${runtime_name}" COPYONLY)
+endforeach()
+
 INCLUDE(FindPkgConfig)
 
 PKG_SEARCH_MODULE(SDL2TTF REQUIRED SDL2_ttf)

README.md

@@ -34,14 +34,36 @@ ls bin/
 480.png 720.png default.xbe vegur.ttf
 ```
 
+### Optional Nix development shell
+
+On Linux, the included flake provides the nxdk and native-build prerequisites
+without installing them globally. Clone nxdk next to this repository, then
+enter the shell and build:
+
+```sh
+git clone --recursive https://github.com/XboxDev/nxdk.git ../nxdk
+nix develop
+make -j$(nproc)
+```
+
+The shell sets `NXDK_DIR` to the sibling checkout by default. Set it before
+entering the shell if nxdk lives elsewhere.
+
 ### Installation
 Simply copy `default.xbe` and all the assets onto your xbox.
 There is no further configuration required. The FTP-server will start automatically with NevolutionX, you'll only need to provide a link and a DHCP-server. The default user credentials are `xbox`/`xbox`.
 
 ## Building with CMake (Linux target)
 TODO: Document what parts of the Linux target are not supported.
 TODO: Document installation for the Linux target, if applicable.
-`cmake -S . -B build && cmake --build build --verbose`
+
+From the Nix development shell:
+
+```sh
+cmake -S . -B build-linux
+cmake --build build-linux --verbose
+(cd build-linux && ./NevolutionX)
+```
 
 ## Credits
 This software is built on top of other awesome projects:
@@ -51,4 +73,3 @@ This software is built on top of other awesome projects:
 ## License
  NevolutionX is published under the MIT License. See [LICENSE](LICENSE) for more information.
  MIT © 2019 Lucas Eriksson
-

flake.nix

@@ -0,0 +1,44 @@
+{
+  description = "NevolutionX development environment";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = { nixpkgs, ... }:
+    let
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" ];
+      forAllSystems = function:
+        nixpkgs.lib.genAttrs supportedSystems (system: function nixpkgs.legacyPackages.${system});
+    in
+    {
+      devShells = forAllSystems (pkgs: {
+        default = pkgs.mkShell {
+          # nxdk cross-compiles for i386-pc-win32; host hardening flags such as
+          # -fPIC are invalid for that target.
+          hardeningDisable = [ "all" ];
+
+          packages = with pkgs; [
+            bison
+            clang
+            clang-tools
+            cmake
+            flex
+            freetype
+            gnumake
+            harfbuzz
+            lld
+            libtiff
+            llvm
+            pkg-config
+            SDL2
+            SDL2_image
+            SDL2_ttf
+          ];
+
+          shellHook = ''
+            export NXDK_DIR="''${NXDK_DIR:-$PWD/../nxdk}"
+            export PATH="$NXDK_DIR/bin:$PATH"
+          '';
+        };
+      });
+    };
+}