Add nix package build

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1 +1,4 @@
 /target
+/result
+/result-lib
+.direnv

flake.lock

@@ -1,33 +1,51 @@
 {
   "nodes": {
-    "flake-utils": {
+    "flake-parts": {
       "inputs": {
-        "systems": "systems"
+        "nixpkgs-lib": "nixpkgs-lib"
       },
       "locked": {
-        "lastModified": 1681202837,
+        "lastModified": 1706830856,
-        "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
+        "narHash": "sha256-a0NYyp+h9hlb7ddVz4LUn1vT/PLwqfrWYcHMvFB1xYg=",
-        "owner": "numtide",
+        "owner": "hercules-ci",
-        "repo": "flake-utils",
+        "repo": "flake-parts",
-        "rev": "cfacdce06f30d2b68473a46042957675eebb3401",
+        "rev": "b253292d9c0a5ead9bc98c4e9a26c6312e27d69f",
         "type": "github"
       },
       "original": {
-        "owner": "numtide",
+        "owner": "hercules-ci",
-        "repo": "flake-utils",
+        "repo": "flake-parts",
         "type": "github"
       }
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1696604326,
+        "lastModified": 1706732774,
-        "narHash": "sha256-YXUNI0kLEcI5g8lqGMb0nh67fY9f2YoJsILafh6zlMo=",
+        "narHash": "sha256-hqJlyJk4MRpcItGYMF+3uHe8HvxNETWvlGtLuVpqLU0=",
-        "owner": "NixOS",
+        "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "87828a0e03d1418e848d3dd3f3014a632e4a4f64",
+        "rev": "b8b232ae7b8b144397fdb12d20f592e5e7c1a64d",
         "type": "github"
       },
       "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1706550542,
+        "narHash": "sha256-UcsnCG6wx++23yeER4Hg18CXWbgNpqNXcHIo5/1Y+hc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "97b17f32362e475016f942bbdfda4a4a72a8a652",
+        "type": "github"
+      },
+      "original": {
+        "dir": "lib",
         "owner": "NixOS",
         "ref": "nixos-unstable",
         "repo": "nixpkgs",
@@ -36,43 +54,26 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1681358109,
+        "lastModified": 1705856552,
-        "narHash": "sha256-eKyxW4OohHQx9Urxi7TQlFBTDWII+F+x2hklDOQPB50=",
+        "narHash": "sha256-JXfnuEf5Yd6bhMs/uvM67/joxYKoysyE3M2k6T3eWbg=",
-        "owner": "NixOS",
+        "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "96ba1c52e54e74c3197f4d43026b3f3d92e83ff9",
+        "rev": "612f97239e2cc474c13c9dafa0df378058c5ad8d",
         "type": "github"
       },
       "original": {
-        "owner": "NixOS",
+        "owner": "nixos",
-        "ref": "nixpkgs-unstable",
+        "ref": "nixos-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
     "root": {
       "inputs": {
+        "flake-parts": "flake-parts",
         "nixpkgs": "nixpkgs",
-        "rust-overlay": "rust-overlay"
+        "systems": "systems",
-      }
+        "treefmt-nix": "treefmt-nix"
-    },
-    "rust-overlay": {
-      "inputs": {
-        "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs_2"
-      },
-      "locked": {
-        "lastModified": 1696817516,
-        "narHash": "sha256-Xt9OY4Wnk9/vuUfA0OHFtmSlaen5GyiS9msgwOz3okI=",
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "rev": "c0df7f2a856b5ff27a3ce314f6d7aacf5fda546f",
-        "type": "github"
-      },
-      "original": {
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "type": "github"
       }
     },
     "systems": {
@@ -89,6 +90,24 @@
         "repo": "default",
         "type": "github"
       }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1706462057,
+        "narHash": "sha256-7dG1D4iqqt0bEbBqUWk6lZiSqqwwAO0Hd1L5opVyhNM=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "c6153c2a3ff4c38d231e3ae99af29b87f1df5901",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -1,31 +1,69 @@
 {
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-    rust-overlay.url = "github:oxalica/rust-overlay";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    systems.url = "github:nix-systems/default";
+
+    # Dev tools
+    treefmt-nix.url = "github:numtide/treefmt-nix";
   };
 
-  outputs = {
+  outputs = inputs:
-    self,
+    inputs.flake-parts.lib.mkFlake {inherit inputs;} {
-    nixpkgs,
+      systems = import inputs.systems;
-    rust-overlay,
+      imports = [
-  }: let
+        inputs.treefmt-nix.flakeModule
-    system = "x86_64-linux";
-    rustVersion = "1.73.0";
-    rust = pkgs.rust-bin.stable.${rustVersion}.default.override {
-      extensions = [
-        "rust-src" # for rust-analyzer
       ];
+      perSystem = {
+        config,
+        self',
+        pkgs,
+        lib,
+        system,
+        ...
+      }: let
+        cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+        nonRustDeps = with pkgs; [
+          libiconv
+          libudev-zero
+          pkg-config
+        ];
+        rust-toolchain = pkgs.symlinkJoin {
+          name = "rust-toolchain";
+          paths = with pkgs; [rustc cargo cargo-watch rust-analyzer rustPlatform.rustcSrc];
+        };
+        udev-rule = builtins.readFile ./heliox.udev;
+      in {
+        # Rust package
+        packages.default = pkgs.rustPlatform.buildRustPackage {
+          inherit (cargoToml.package) name version;
+          src = ./.;
+          cargoLock.lockFile = ./Cargo.lock;
+          postInstall = ''
+            mkdir -p $out/etc/udev/rules.d/
+            echo ${udev-rule} > $out/etc/udev/rules.d/70-heliox.rules
+          '';
+        };
+
+        # Rust dev environment
+        devShells.default = pkgs.mkShell {
+          inputsFrom = [
+            config.treefmt.build.devShell
+          ];
+          buildInputs = nonRustDeps;
+          nativeBuildInputs = with pkgs; [
+            rust-toolchain
+          ];
+          RUST_BACKTRACE = 1;
+        };
+
+        treefmt.config = {
+          projectRootFile = "flake.nix";
+          programs = {
+            nixpkgs-fmt.enable = true;
+            rustfmt.enable = true;
+          };
+        };
+      };
     };
-    pkgs = import nixpkgs {
-      inherit system;
-      overlays = [rust-overlay.overlays.default];
-    };
-  in {
-    devShells.${system}.default = pkgs.mkShell {
-      buildInputs =
-        [rust]
-        ++ (with pkgs; [rust-analyzer pkg-config libudev-zero]);
-      RUST_BACKTRACE = 1;
-    };
-  };
 }

heliox.udev

@@ -0,0 +1,2 @@
+SUBSYSTEM=="tty", GROUP="plugdev". MODE="0660"
+SUBSYSTEMS=="usb", ATTRS{idProduct}=="7523", ATTRS{idVendor}=="1a86", SYMLINK+="heliox"

udev.nix

@@ -1,16 +0,0 @@
-{
-  config,
-  pkgs,
-  ...
-}: let
-  my-rules = pkgs.writeTextFile {
-    name = "70-heliox.rules";
-    text = ''
-    SUBSYSTEM=="tty", GROUP="plugdev". MODE="0660"
-    SUBSYSTEMS=="usb", ATTRS{idProduct}=="7523", ATTRS{idVendor}=="1a86", SYMLINK+="heliox"
-    '';
-    destination = "/etc/udev/rules.d/70-heliox.rules";
-  };
-in {
-   services.udev.packages = [ my-rules ];
-}