feat: complete nix flake (#37)

flake.nix

@@ -1,49 +1,84 @@
 {
-  description = "scenefx development environment";
-
-  inputs = {
-    flake-compat = {
-      url = "github:edolstra/flake-compat";
-      flake = false;
-    };
-
-    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-  };
-
-  outputs = { self, nixpkgs, flake-compat, ... }:
+  description = "Scenefx development environment";
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+  outputs =
+    { self, nixpkgs, ... }:
     let
-      pkgsFor = system:
-        import nixpkgs {
-          inherit system;
-          overlays = [ ];
-        };
-
-      targetSystems = [ "aarch64-linux" "x86_64-linux" ];
-    in {
-      devShells = nixpkgs.lib.genAttrs targetSystems (system:
-        let pkgs = pkgsFor system;
-        in {
-          default = pkgs.mkShell {
-            name = "scenefx-shell";
-
-            inputsFrom = [ pkgs.wlroots_0_17 ];
+      mkPackages = pkgs: {
+        scenefx = pkgs.callPackage (
+          { wlroots_0_17, ... }:
+          pkgs.stdenv.mkDerivation {
+            pname = "scenefx";
+            version = "0.1.0-git";
+            src = ./.;
+            outputs = [
+              "out"
+              "lib"
+            ];
 
             nativeBuildInputs = with pkgs; [
-              cmake
+              pkg-config
               meson
+              cmake
               ninja
               scdoc
-              pkg-config
-              hwdata
             ];
 
-            shellHook = with pkgs; ''(
-              mkdir -p "$PWD/subprojects"
-              cd "$PWD/subprojects"
-              cp -R --no-preserve=mode,ownership ${wlroots_0_17.src} wlroots
+            buildInputs = with pkgs; [
+              libdrm
+              libxkbcommon
+              pixman
+              libGL # egl
+              mesa # gbm
+              wayland # wayland-server
+              wayland-protocols
+              wlroots_0_17
+            ];
+
+            meta = with pkgs.lib; {
+              description = "A drop-in replacement for the wlroots scene API that allows wayland compositors to render surfaces with eye-candy effects";
+              homepage = "https://github.com/wlrfx/scenefx";
+              license = licenses.mit;
+              platforms = platforms.linux;
+            };
+          }
+        ) { };
+      };
+
+      targetSystems = [
+        "aarch64-linux"
+        "x86_64-linux"
+      ];
+      pkgsFor = system: import nixpkgs { inherit system; };
+      forEachSystem = f: nixpkgs.lib.genAttrs targetSystems (system: f (pkgsFor system));
+    in
+    {
+      overlays = rec {
+        default = insert;
+        override = _: prev: mkPackages prev;
+        insert = _: prev: mkPackages (pkgsFor prev.system);
+      };
+
+      packages = forEachSystem (
+        pkgs: (mkPackages pkgs) // { default = self.packages.${pkgs.system}.scenefx; }
+      );
+
+      devShells = forEachSystem (pkgs: {
+        default = pkgs.mkShell {
+          name = "scenefx-shell";
+          inputsFrom = [
+            self.packages.${pkgs.system}.scenefx
+            pkgs.wlroots_0_17
+          ];
+          shellHook = ''
+            (
+              # Copy the nix version of wlroots into the project
+              mkdir -p "$PWD/subprojects" && cd "$PWD/subprojects"
+              cp -R --no-preserve=mode,ownership ${pkgs.wlroots_0_17.src} wlroots
             )'';
-          };
-        });
+        };
+      });
+
+      formatter = forEachSystem (pkgs: pkgs.nixfmt-rfc-style);
     };
 }
-