anki-bin: add darwin support

pkgs/games/anki/bin.nix

@@ -1,7 +1,8 @@
-{ fetchurl, stdenv, lib, buildFHSUserEnv, appimageTools, writeShellScript, anki }:
+{ fetchurl, stdenv, lib, buildFHSUserEnv, appimageTools, writeShellScript, anki, undmg }:
 
 let
   pname = "anki-bin";
+  # Update hashes for both Linux and Darwin!
   version = "2.1.36";
 
   unpacked = stdenv.mkDerivation {
@@ -28,12 +29,12 @@ let
 
   meta = with lib; {
     inherit (anki.meta) license homepage description longDescription;
-    platforms = [ "x86_64-linux" ];
+    platforms = [ "x86_64-linux" "x86_64-darwin" ];
     maintainers = with maintainers; [ atemu ];
   };
 in
 
-buildFHSUserEnv (appimageTools.defaultFhsEnvArgs // {
+if stdenv.isLinux then buildFHSUserEnv (appimageTools.defaultFhsEnvArgs // {
   name = "anki";
 
   runScript = writeShellScript "anki-wrapper.sh" ''
@@ -41,4 +42,21 @@ buildFHSUserEnv (appimageTools.defaultFhsEnvArgs // {
   '';
 
   inherit meta;
-})
+}) else stdenv.mkDerivation {
+  inherit pname version;
+
+  src = fetchurl {
+    url = "https://github.com/ankitects/anki/releases/download/${version}/anki-${version}-mac.dmg";
+    sha256 = "1i6iidm5h8r9g801mvqxi2av03qdw3lr28056fv5ixnb5dq2wqim";
+  };
+
+  nativeBuildInputs = [ undmg ];
+  sourceRoot = ".";
+
+  installPhase = ''
+    mkdir -p $out/Applications/
+    cp -a Anki.app $out/Applications/
+  '';
+
+  inherit meta;
+}