ivan: add full iconset

pkgs/games/ivan/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, cmake, pkgconfig, SDL2, SDL2_mixer, alsaLib, libpng
-, pcre, graphicsmagick, makeDesktopItem }:
+, pcre, makeDesktopItem }:
 
 stdenv.mkDerivation rec {
 
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
     sha256 = "04jzs8wad2b3g9hvnijr4r89iiw6b1i44zdzkg0dy447lrw6l6xc";
   };
 
-  nativeBuildInputs = [ cmake pkgconfig graphicsmagick ];
+  nativeBuildInputs = [ cmake pkgconfig ];
 
   buildInputs = [ SDL2 SDL2_mixer alsaLib libpng pcre ];
 
@@ -36,12 +36,19 @@ stdenv.mkDerivation rec {
     comment = meta.description;
   };
 
-  # Create appropriate directories. Convert "Icon.bmp" to "ivan.png", then copy
-  # it and "ivan.desktop" to these directories.
+  # Create appropriate directories. Copy icons and desktop item to these directories.
   postInstall = ''
     mkdir -p $out/share/applications
+    mkdir -p $out/share/icons/hicolor/16x16/apps
     mkdir -p $out/share/icons/hicolor/32x32/apps
-    gm convert $src/Graphics/Icon.bmp $out/share/icons/hicolor/32x32/apps/ivan.png
+    mkdir -p $out/share/icons/hicolor/128x128/apps
+    mkdir -p $out/share/icons/hicolor/256x256/apps
+    mkdir -p $out/share/icons/hicolor/512x512/apps
+    cp $src/Graphics/icons/shadowless.iconset/icon_16x16.png $out/share/icons/hicolor/16x16/apps/ivan.png
+    cp $src/Graphics/icons/shadowless.iconset/icon_32x32.png $out/share/icons/hicolor/32x32/apps/ivan.png
+    cp $src/Graphics/icons/shadowless.iconset/icon_128x128.png $out/share/icons/hicolor/128x128/apps/ivan.png
+    cp $src/Graphics/icons/shadowless.iconset/icon_256x256.png $out/share/icons/hicolor/256x256/apps/ivan.png
+    cp $src/Graphics/icons/shadowless.iconset/icon_512x512.png $out/share/icons/hicolor/512x512/apps/ivan.png
     cp ${ivanDesktop}/share/applications/* $out/share/applications
   '';