nix: init tooling (#5)

Co-authored-by: Bloxx12 <blox@blox>

.envrc

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

.gitignore

@@ -1,2 +1,3 @@
 target*
 result*
+.direnv

flake.lock

@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1746904237,
+        "narHash": "sha256-3e+AVBczosP5dCLQmMoMEogM57gmZ2qrVSrmq9aResQ=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "d89fc19e405cb2d55ce7cc114356846a0ee5e956",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "systems": "systems"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1689347949,
+        "narHash": "sha256-12tWmuL2zgBgZkdoB6qXZsgJEH9LR3oUgpaQq2RbI80=",
+        "owner": "nix-systems",
+        "repo": "default-linux",
+        "rev": "31732fcf5e8fea42e59c2488ad31a0e651500f68",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default-linux",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,22 @@
+{
+  description = "Superfreq";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    systems.url = "github:nix-systems/default-linux";
+  };
+
+  outputs = inputs @ {
+    self,
+    nixpkgs,
+    systems,
+  }: let
+    inherit (nixpkgs) lib;
+    eachSystem = lib.genAttrs (import inputs.systems);
+    pkgsFor = eachSystem (system: nixpkgs.legacyPackages.${system});
+  in {
+    devShells = eachSystem (system: {
+      default = pkgsFor.${system}.callPackage ./nix/shell.nix {};
+    });
+  };
+}

nix/shell.nix

@@ -0,0 +1,20 @@
+{
+  mkShell,
+  rust-analyzer-unwrapped,
+  rustfmt,
+  clippy,
+  cargo,
+  rustc,
+  rustPlatform,
+}:
+mkShell {
+  packages = [
+    cargo
+    clippy
+    rustc
+    rustfmt
+    rust-analyzer-unwrapped
+  ];
+
+  env.RUST_SRC_PATH = "${rustPlatform.rustLibSrc}";
+}