move pywal to shell binary

home-manager/terminal.nix

@@ -30,7 +30,6 @@
       clean = "nix-store --gc";
       dotfiles = "cd ~/dotfiles/";
       nv = "nvim";
-      pywal = "bash ~/dotfiles/.scripts/switch-wallpaper.sh";
     };
 
     oh-my-zsh = {
@@ -65,5 +64,17 @@
   home.packages = with pkgs; [
     neofetch
     (nerdfonts.override { fonts = [ "JetBrainsMono" ]; })
+    (pkgs.writeShellScriptBin "pywal" ''
+      # -n tells `wal` to skip setting the wallpaper.
+      wal -i ~/Wallpapers/ -n
+
+      # Using feh to tile the wallpaper now.
+      # We grab the wallpaper location from wal's cache so
+      # that this works even when a directory is passed.
+      swww img "$(<"${config.home.homeDirectory}/.cache/wal/wal")" --transition-type wipe --transition-angle 45 --transition-fps 90
+
+      # Copy cava and update config
+      cp ~/.cache/wal/cava-config ~/.config/cava/config && pkill -USR2 cava
+    '')
   ];
 }