refactor basic tools a bit

modules/basic-tools/nix.nix

@@ -0,0 +1,36 @@
+{ lib, pkgs, inputs, ... }: {
+
+  nix = {
+    extraOptions = ''
+      experimental-features = nix-command flakes
+    '';
+  };
+
+  # override default nix shell nixpkgs# behaviour to use current flake lock
+  nix.registry =
+    let flakes = lib.filterAttrs (_name: value: value ? outputs) inputs.self.inputs;
+    in builtins.mapAttrs (_name: v: { flake = v; }) flakes;
+
+  nix.nixPath = lib.mapAttrsToList (name: value: "${name}=${value.outPath}") inputs.self.inputs;
+
+  environment.shellAliases = {
+    nix-build="${pkgs.nix-output-monitor}/bin/nom-build";
+    nix-shell="${pkgs.nix-output-monitor}/bin/nom-shell";
+  };
+
+  programs.zsh.interactiveShellInit = ''
+      # hacky wrapper for nix, so we can use nom automagically
+      export _nom_cmd=${pkgs.nix-output-monitor}/bin/nom
+      function nix {
+          case $1 in
+              build|shell|develop)
+                  echo \[SUBSTITUTION\] ''$_nom_cmd ''${@:1} 1>&2
+                  ''$_nom_cmd ''${@:1}
+                  ;;
+              *)
+                  ${pkgs.nix}/bin/nix $@
+          esac
+      }
+      compdef nix=_nix
+  '';
+}