init

flake.nix

@@ -0,0 +1,23 @@
+{
+  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
+}