Add colorscheme generator function

common/fragments/graphical/colors.nix

@@ -0,0 +1,13 @@
+{ lib, pkgs, ... }: {
+  colorscheme = name: image: rec {
+    generate = pkgs.callPackage ({ runCommand, colorz }:
+      runCommand name { nativeBuildInputs = [ colorz ]; } ''
+        colorz ${image} --no-preview -n 8 --bold 30 --minv 0 --maxv 255 | awk '{print $1} {print $2}' > $out
+      '') { };
+
+    colors = builtins.listToAttrs (lib.lists.imap0 (i: v: {
+      name = builtins.toString i;
+      value = v;
+    }) (lib.strings.splitString "\n" (builtins.readFile generate)));
+  };
+}