2024?

flake.nix

@@ -0,0 +1,66 @@
+{
+  description = "AOC.";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nix-filter.url = "github:numtide/nix-filter";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      rust-overlay,
+      nix-filter,
+      ...
+    }:
+    let
+      # Utilities
+      inherit (nixpkgs) lib;
+      # Define the systems to support (all Linux systems exposed by nixpkgs)
+      systems = lib.intersectLists lib.systems.flakeExposed lib.platforms.linux;
+      forAllSystems = lib.genAttrs systems;
+      # Create a mapping from system to corresponding nixpkgs : https://nixos.wiki/wiki/Overlays#In_a_Nix_flake
+      nixpkgsFor = forAllSystems (system: (nixpkgs.legacyPackages.${system}.extend rustOverlay));
+      # =========
+      rustOverlay = import rust-overlay;
+      rustVersion = "stable";
+      rustChannel = "latest";
+    in
+    {
+      devShells = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgsFor.${system};
+          rust = pkgs.rust-bin.${rustVersion}.${rustChannel}.default.override {
+            extensions = [
+              "rust-src"
+              "rust-analyzer"
+            ];
+          };
+        in
+        {
+          default = pkgs.mkShell {
+            nativeBuildInputs = (
+              with pkgs;
+              [
+                rust
+                sccache
+              ]
+            );
+
+            buildInputs = [ ];
+
+            shellHook = ''
+              echo "RUST C: "$(rustc --version)" - "$(which rustc)
+              export RUSTC_WRAPPER="sccache"
+            '';
+          };
+        }
+      );
+    };
+}