nix: flake, package, nixos and home-manager modules

nix/package.nix

@@ -0,0 +1,45 @@
+{
+  lib,
+  stdenv,
+  rustPlatform,
+  makeWrapper,
+  fastfetch,
+
+  # linux
+  pciutils,
+}:
+
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "nyi";
+  version = lib.fileContents ../VERSION;
+  __structuredAttrs = true;
+  strictDeps = true;
+  src = lib.fileset.toSource {
+    root = ../.;
+    fileset = lib.fileset.unions [
+      ../Cargo.toml
+      ../Cargo.lock
+      ../VERSION
+      ../src
+    ];
+  };
+
+  cargoLock.lockFile = ../Cargo.lock;
+  env.NYI_CODENAME = "nyiotxa";
+  nativeBuildInputs = [ makeWrapper ];
+  postInstall = ''
+    wrapProgram $out/bin/nyi \
+    --prefix PATH : ${
+      lib.makeBinPath ([ fastfetch ] ++ lib.optionals stdenv.hostPlatform.isLinux [ pciutils ])
+    }
+  '';
+
+  meta = {
+    description = "Animated 3D fetch with cool features";
+    homepage = "https://github.com/elwrcl/nyi";
+    changelog = "https://github.com/elwrcl/nyi/releases/tag/v${finalAttrs.version}";
+    license = lib.licenses.isc;
+    mainProgram = "nyi";
+    platforms = lib.platforms.unix;
+  };
+})