refactor: get rid of vars and move common to modules

nixosModules/base/packages/default.nix

@@ -0,0 +1,126 @@
+self: {
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib) attrValues mkIf;
+
+  cfg = config.roles.base;
+in {
+  config = mkIf (cfg.enable) {
+    nixpkgs.overlays =
+      (map (i: self.inputs.${i}.overlays.default) [
+        "discord-overlay"
+        "grim-hyprland"
+        "nixpkgs-wayland"
+      ])
+      ++ (attrValues {
+        inherit
+          (self.overlays)
+          xdg-desktop-portal-kde
+          ;
+      });
+
+    environment.systemPackages =
+      (attrValues {
+        inherit
+          (self.packages.${pkgs.system})
+          pokemon-colorscripts
+          repl
+          ;
+
+        inherit
+          (pkgs.nodePackages)
+          undollar
+          ;
+
+        inherit (pkgs) alejandra;
+
+        # Archiving
+        inherit
+          (pkgs)
+          zip
+          unzip
+          p7zip
+          bzip2
+          gzip
+          gnutar
+          xz
+          ;
+
+        # File management
+        inherit
+          (pkgs)
+          findutils
+          diffutils
+          util-linux
+          which
+          imagemagick
+          ;
+
+        # Networking
+        inherit (pkgs.dig) dnsutils;
+        inherit
+          (pkgs)
+          arp-scan
+          openssh
+          rsync
+          wget
+          gnupg
+          ;
+
+        # Misc CLI stuff
+        inherit
+          (pkgs)
+          hydra-check
+          killall
+          nix-output-monitor
+          nix-melt
+          progress
+          tree
+          gnugrep
+          gnused
+          ;
+
+        # Expected Stuff
+        inherit
+          (pkgs)
+          hostname
+          man
+          perl
+          tzdata
+          ;
+      })
+      ++ [
+        # This could help as well: nix derivation show -r /run/current-system
+        (pkgs.writeShellApplication {
+          name = "listDerivs";
+          text = ''
+            exec nix-store --query --requisites /run/current-system | cut -d- -f2- | sort -u
+          '';
+        })
+
+        (pkgs.writeShellApplication {
+          name = "from";
+
+          runtimeInputs = attrValues {
+            inherit
+              (pkgs)
+              coreutils
+              which
+              ;
+          };
+
+          text = ''
+            for var do
+                realpath "$(which "$var")"
+            done
+          '';
+        })
+      ];
+  };
+
+  # For accurate stack trace
+  _file = ./default.nix;
+}