feat: nixify

.envrc

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

flake.nix

@@ -0,0 +1,36 @@
+{
+  outputs = { self, nixpkgs }:
+    let
+      nameValuePair = name: value: { inherit name value; };
+      genAttrs = names: f: builtins.listToAttrs (map (n: nameValuePair n (f n)) names);
+      allSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+
+      forAllSystems = f: genAttrs allSystems (system: f rec {
+        inherit system;
+        pkgs = import nixpkgs { inherit system; };
+        lib = pkgs.lib;
+      });
+    in
+    {
+      devShells = forAllSystems ({ system, pkgs, ... }: {
+        default = with pkgs;
+          stdenv.mkDerivation {
+            name = "riff-shell";
+            buildInputs = [
+              bashInteractive
+              cargo rustc rustfmt
+            ] ++ lib.optionals (stdenv.isDarwin) [
+              libiconv
+            ];
+
+            "RUST_SRC_PATH" = "${rustPlatform.rustLibSrc}";
+
+
+          };
+      });
+
+      # Compatibility with older Nix installations that don't check for `devShells.<arch>.default` first.
+      devShell = forAllSystems ({ system, ... }: self.devShells.${system}.default);
+  };
+}
+