youtube-dl: Add

users/simon/modules/default.nix

@@ -19,6 +19,7 @@
     ./vdirsyncer.nix
     ./xcompose.nix
     ./xdg.nix
+    ./youtube-dl.nix
     ./zathura.nix
     ./zsh.nix
   ];

users/simon/modules/programs.nix

@@ -115,7 +115,6 @@ in
     mkvtoolnix-cli # matroska (de-)muxing
     unstable.waifu2x-converter-cpp # super-resolution for anime-style images
     waifu2x-photo # waifu2x-converter-cpp for real life photos
-    youtube-dl # universal video downloader
 
     # audio
     abcde # cd ripper

users/simon/modules/youtube-dl.nix

@@ -0,0 +1,26 @@
+{ lib, pkgs, ... }:
+let
+  formats = (lib.flatten
+    (lib.crossLists (x: y: [ "${x}+${y}" ])
+      [
+        [ "bestvideo[vcodec^=av01]" "bestvideo[vcodec^=vp9]" "bestvideo[vcodec^=avc1]" "bestvideo" ]
+        [ "bestaudio[acodec^=opus]" "bestaudio[acodec^=mp4a]" "bestaudio" ]
+      ])) ++ [
+    "best"
+  ];
+
+  options = {
+    format = lib.concatStringsSep "/" formats;
+  };
+in
+{
+  xdg.configFile."youtube-dl/config".text = lib.concatStringsSep
+    "\n"
+    (lib.mapAttrsToList
+      (k: v: "--${k} ${v}")
+      options);
+
+  home.packages = with pkgs; [
+    youtube-dl
+  ];
+}