meat

flakes/meat/flake.nix

@@ -0,0 +1,74 @@
+{
+  description = "the meat (package) manager";
+
+  inputs = {
+    # use registry nixpkgs
+    # nixpkgs.url = "nixpkgs/nixos-unstable";
+
+    src = {
+      url = "path:src";
+      flake = false;
+    };
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    src,
+  }: let
+    # System types to support.
+    supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
+
+    # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+    # Nixpkgs instantiated for supported system types.
+    nixpkgsFor = forAllSystems (system:
+      import nixpkgs {
+        inherit system;
+        # overlays = [self.overlay];
+      });
+  in {
+    # Provide some binary packages for selected system types.
+    packages = forAllSystems (system: let
+      pkgs = nixpkgsFor.${system};
+    in {
+      meat = pkgs.callPackage ./meat.nix {
+        inherit src;
+      };
+    });
+
+    # The default package for 'nix build'. This makes sense if the
+    # flake provides only one package or there is a clear "main"
+    # package.
+    defaultPackage = forAllSystems (system: self.packages.${system}.meat);
+
+    # A NixOS module, if applicable (e.g. if the package provides a system service).
+    nixosModules.meat = {
+      pkgs,
+      config,
+      ...
+    }: {
+      options.programs.meat = with pkgs.lib; {
+        flake = mkOption {
+          type = with types; nullOr (either path str);
+          default = null;
+          description = "path to your system flake";
+        };
+      };
+      config = {
+        environment.systemPackages = [self.defaultPackage.${pkgs.system}];
+        environment.sessionVariables = let
+          cfg = config.programs.meat;
+        in {
+          FLAKE =
+            if (cfg.flake == null)
+            then throw "Please set the programs.meat.flake option to your system flake."
+            else config.programs.meat.flake;
+        };
+      };
+    };
+
+    # Tests run by 'nix flake check' and by Hydra.
+  };
+}