nix/package: init

flake.nix

@@ -4,9 +4,11 @@
 
     rust-overlay.url = "github:oxalica/rust-overlay";
     rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
+
+    crane.url = "github:ipetkov/crane";
   };
 
-  outputs = { self, nixpkgs, rust-overlay }:
+  outputs = { self, nixpkgs, rust-overlay, crane }:
   let
     inherit (nixpkgs) lib;
 
@@ -31,6 +33,32 @@
       };
     in f system pkgs toolchain);
   in {
+    apps = forAllSystems (system: _: _: {
+      default = self.apps.${system}.kagami;
+      kagami = {
+        type = "app";
+        program = lib.getExe self.packages.${system}.kagami;
+      };
+    });
+
+    packages = forAllSystems (system: pkgs: _: {
+      default = self.packages.${system}.kagami;
+      kagami = let
+        cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+        cargoLock = ./Cargo.lock;
+        craneLib = crane.mkLib pkgs;
+        src = lib.fileset.toSource {
+          root = ./.;
+          fileset = lib.fileset.unions [
+            (craneLib.fileset.commonCargoSources ./.)
+          ];
+        };
+      in pkgs.callPackage ./nix/package.nix {
+        useCrane = true;
+        inherit cargoToml cargoLock src craneLib;
+      };
+    });
+
     devShells = forAllSystems (system: pkgs: toolchain: {
       default = pkgs.mkShell {
         nativeBuildInputs = with pkgs; [