Initialize the repository

.envrc

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+use flake

.gitignore

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+.direnv

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1669418739,
+        "narHash": "sha256-T86oFvcUIRwHWBWUt7WjaP4BP/3lDGbv5AppQSI1FkI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "695b3515251873e0a7e2021add4bba643c56cde3",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-22.05",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1665296151,
+        "narHash": "sha256-uOB0oxqxN9K7XGF1hcnY+PQnlQJ+3bP2vCn/+Ru/bbc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "14ccaaedd95a488dd7ae142757884d8e125b3363",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "oxalica": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "narHash": "sha256-xMOq9ifVo63/aBA1VIHQQ4riuRJGyup7F1orjekAwpk=",
+        "type": "tarball",
+        "url": "https://github.com/oxalica/rust-overlay/archive/master.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://github.com/oxalica/rust-overlay/archive/master.tar.gz"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "oxalica": "oxalica"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Advent of Code";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-22.05";
+    oxalica.url = "https://github.com/oxalica/rust-overlay/archive/master.tar.gz";
+  };
+
+  outputs = { self, nixpkgs, oxalica }:
+    let 
+      version = builtins.string 0 8 self.lastModifiedDate;
+      supportedSystems = [ "x86_64-linux" ];
+    in
+    {
+      devShell."x86_64-linux" =
+        let
+          rust_overlay = import oxalica;
+          pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ rust_overlay ]; };
+          rust = pkgs.rust-bin.stable."1.65.0".default.override {
+            extensions = [ "rust-src" ];
+          };
+        in
+        pkgs.mkShell {
+          name = "aoc-devshell";
+          buildInputs = [
+            rust
+          ];
+        };
+    };
+}