Add shell.nix

flake.nix

@@ -14,8 +14,19 @@
         };
       in
       {
-        defaultPackage = pkgs.callPackage ./pict-rs.nix {
+        packages = rec {
+          pict-rs = pkgs.callPackage ./pict-rs.nix {
             inherit (pkgs.darwin.apple_sdk.frameworks) Security;
           };
+
+          default = pict-rs;
+        };
+
+        apps = rec {
+          dev = flake-utils.lib.mkApp { drv = self.packages.${system}.pict-rs; };
+          default = dev;
+        };
+
+        devShell = pkgs.callPackage ./shell.nix { };
       });
 }

shell.nix

@@ -0,0 +1,16 @@
+{ pkgs
+, mkShell
+, cargo
+, clippy
+, gcc
+, protobuf
+, rust-analyzer
+, rustc
+, rustfmt
+}:
+
+mkShell {
+  nativeBuildInputs = [ cargo clippy gcc protobuf rust-analyzer rustc rustfmt ];
+
+  RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
+}