added stuff

nyx/flake/shell.nix

@@ -0,0 +1,42 @@
+{
+  perSystem = {
+    inputs',
+    config,
+    pkgs,
+    ...
+  }: {
+    devShells.default = pkgs.mkShell {
+      name = "nyx";
+      meta.description = "The default development shell for my NixOS configuration";
+
+      shellHook = ''
+        ${config.pre-commit.installationScript}
+      '';
+
+      # tell direnv to shut up
+      DIRENV_LOG_FORMAT = "";
+
+      # packages available in the dev shell
+      packages = with pkgs; [
+        inputs'.agenix.packages.default # provide agenix CLI within flake shell
+        inputs'.deploy-rs.packages.default # provide deploy-rs CLI within flake shell
+        config.treefmt.build.wrapper # treewide formatter
+        nil # nix ls
+        alejandra # nix formatter
+        git # flakes require git, and so do I
+        glow # markdown viewer
+        statix # lints and suggestions
+        deadnix # clean up unused nix code
+        nodejs # for ags and eslint_d
+        (pkgs.writeShellApplication {
+          name = "update";
+          text = ''
+            nix flake update && git commit flake.lock -m "flake: bump inputs"
+          '';
+        })
+      ];
+
+      inputsFrom = [config.treefmt.build.devShell];
+    };
+  };
+}