blobby: wrap to create the configs in $HOME without user actions

pkgs/games/blobby/blobby.sh

···
+#! @shell@
+
+test -d ~/.blobby || {
+  mkdir ~/.blobby
+  cp -r "@out@/share/blobby"/* ~/.blobby
+  chmod u+w -R ~/.blobby
+  ( cd ~/.blobby; for i in *.zip; do @unzip@/bin/unzip "$i"; done )
+}
+
+@out@/bin/blobby.bin

pkgs/games/blobby/default.nix

···
 {stdenv, fetchurl, SDL2, SDL2_image, mesa, cmake, physfs, boost, zip, zlib
-, pkgconfig}:
+, pkgconfig, unzip}:
 stdenv.mkDerivation rec {
   version = "1.0";
   name = "blobby-volley-${version}";
···
     sha256 = "1qpmbdlyhfbrdsq4vkb6cb3b8mh27fpizb71q4a21ala56g08yms";
   };
 
-  buildInputs = [SDL2 SDL2_image mesa cmake physfs boost zip zlib pkgconfig];
+  buildInputs = [SDL2 SDL2_image mesa cmake physfs boost zip zlib pkgconfig
+    unzip];
 
   preConfigure=''
     sed -e '1i#include <iostream>' -i src/NetworkMessage.cpp
+  '';
+
+  inherit unzip;
+
+  postInstall = ''
+    cp ../data/Icon.bmp "$out/share/blobby/"
+    mv "$out/bin"/blobby{,.bin}
+    substituteAll "${./blobby.sh}" "$out/bin/blobby"
+    chmod a+x "$out/bin/blobby"
   '';
 
   meta = {