init

.envrc

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

.gitignore

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+/.direnv/

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1669898277,
+        "narHash": "sha256-LYVM2vEghOvH4QiWsN+QSNuFafgvmVRVhHlnV1oessw=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "6060f1268ca7b44d62304564eadb0b0667ea8b84",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "advent of code with Common-Lisp";
+  inputs.nixpkgs.url = "github:nixos/nixpkgs";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem
+      (system:
+        let pkgs = nixpkgs.legacyPackages.${system}; in
+        {
+          devShells.default = pkgs.mkShell {
+            buildInputs = [
+              pkgs.sbcl
+
+            ];
+            shellHook = ''
+              export SOME_SHELL_VAR=ITS_VALUE
+            '';
+          };
+        }
+      );
+  # see https://serokell.io/blog/practical-nix-flakes
+}