randomly choose a bg theme

config/home-manager/base.nix

@@ -99,5 +99,5 @@ desktop: {pkgs, ...}: {
   home.stateVersion = "22.05";
   manual.manpages.enable = false; # broken
 
-  _module.args.bg = "${pkgs.lotte-art}/2022-06-21-sammythetanuki-lotteplushpride.jxl";
+  _module.args.withNSFW = false;
 }

config/nutty-noon.nix

@@ -121,5 +121,5 @@
     "https://cache.nixos.org/"
   ];
   services.tailscale.useRoutingFeatures = "client";
-  home-manager.users.darkkirb._module.args.bg = lib.mkForce "${pkgs.lotte-art}/2022-08-12-deathtoaster-funpit-scat.jxl";
+  home-manager.users.darkkirb._module.args.withNSFW = lib.mkForce true;
 }

config/programs/theming.nix

@@ -2,11 +2,77 @@
   pkgs,
   config,
   colorpickle,
-  bg,
+  withNSFW,
+  lib,
+  self,
+  nixpkgs,
   ...
 }: let
   theme = import ../../extra/theme.nix;
   inherit (config.lib.formats.rasi) mkLiteral;
+  
+  prepBGs = [
+    ["${pkgs.lotte-art}/2021-01-27-ceeza-lottedonut.jxl" "-crop" "2048x1152+0+106"]
+    ["${pkgs.lotte-art}/2021-09-15-cloverhare-lotteplush.jxl" "-crop" "1774x997+0+173"]
+    ["${pkgs.lotte-art}/2022-11-15-wolfsifi-maff-me-leashed.jxl" "-crop" "1699x956+0+88"]
+  ];
+
+  prepBGsNSFW = [
+    ["${pkgs.lotte-art}/2021-11-27-theroguez-lottegassyvore1.jxl" "-crop" "1233x694+0+65"]
+    ["${pkgs.lotte-art}/2021-12-12-baltnwolf-christmas-diaper.jxl" "-crop" "2599x1462+0+294"]
+    ["${pkgs.lotte-art}/2021-12-12-baltnwolf-christmas-diaper-messy.jxl" "-crop" "2599x1462+0+294"]
+    ["${pkgs.lotte-art}/2022-04-20-cloverhare-mxbatty-maffsie-train-plush.jxl" "-crop" "3377x1900+0+211"]
+    ["${pkgs.lotte-art}/2022-04-20-cloverhare-mxbatty-me-train-maffsie-plush.jxl" "-crop" "3377x1900+0+211"]
+    ["${pkgs.lotte-art}/2022-12-27-rexyi-scatych.jxl" "-crop" "2000x1120+0+0"]
+    ["${pkgs.lotte-art}/2023-03-09-rexyi-voredisposal-ych.jxl" "-crop" "2000x1120+0+0"]
+    ["${pkgs.lotte-art}/2023-04-16-baltnwolf-lottediaperplushies.jxl" "-gravity" "center" "-background" "white" "-extent" "5333x3000"]
+    ["${pkgs.lotte-art}/2023-04-16-baltnwolf-lottediaperplushies-messy.jxl" "-gravity" "center" "-background" "white" "-extent" "5333x3000"]
+  ];
+
+  fixupImage = instructions: pkgs.stdenv.mkDerivation {
+    name = "bg.jxl";
+    src = pkgs.emptyDirectory;
+    nativeBuildInputs = [pkgs.imagemagick];
+    buildPhase = ''
+      convert ${toString instructions} $out
+    '';
+    installPhase = "true";
+  };
+  
+  validBGs = ["${pkgs.lotte-art}/2020-07-24-urbankitsune-bna-ych.jxl" "${pkgs.lotte-art}/2022-05-02-anonfurryartist-giftart.jxl" "${pkgs.lotte-art}/2022-06-21-sammythetanuki-lotteplushpride.jxl"] ++ (map fixupImage prepBGs);
+  validBGsNSFW = ["${pkgs.lotte-art}2021-10-29-butterskunk-lotte-scat-buffet.jxl" "${pkgs.lotte-art}/2022-08-12-deathtoaster-funpit-scat.jxl" "${pkgs.lotte-art}/2022-08-15-deathtoaster-funpit-mud.jxl"] ++ (map fixupImage prepBGsNSFW) ++ validBGs;
+
+  mod = a: b: a - (a / b * b);
+  choose = l: rand: let len = builtins.length l; in builtins.elemAt l (mod rand len);
+  hexToIntList = {
+    "0" = 0;
+    "1" = 1;
+    "2" = 2;
+    "3" = 3;
+    "4" = 4;
+    "5" = 5;
+    "6" = 6;
+    "7" = 7;
+    "8" = 8;
+    "9" = 9;
+    "a" = 10;
+    "b" = 11;
+    "c" = 12;
+    "d" = 13;
+    "e" = 14;
+    "f" = 15;
+    "A" = 10;
+    "B" = 11;
+    "C" = 12;
+    "D" = 13;
+    "E" = 14;
+    "F" = 15;
+  };
+  hexToInt = s: lib.foldl (state: new: state * 16 + hexToIntList.${new}) 0 (lib.strings.stringToCharacters s);
+  
+  seed = hexToInt (self.shortRev or nixpkgs.shortRev);
+  bg = choose (if withNSFW then validBGsNSFW else validBGs) seed;
+
   color = n:
     config.environment.graphical.colors.main."${builtins.toString n}";
   color' = n: mkLiteral (color n);