ftb.nix

{ stdenv, xorg, openjdk, mesa, openal, jre, ... }:

stdenv.mkDerivation {
  name = "ftb";
  src = ./FTB_Launcher.jar;
  buildInputs = with xorg; [ libX11 libXext libXcursor libXrandr libXxf86vm openjdk mesa openal ];
  buildCommand = ''
    mkdir -pv $out/libexec/ $out/bin/
    cp -v $src $out/libexec/FTB_Launcher.jar

    RESULT=
    for x in $nativeBuildInputs; do
      RESULT=$x/lib/:$RESULT
    done

    cat <<EOF > $out/bin/ftb
    #!${stdenv.shell}
    export LD_LIBRARY_PATH=$RESULT
    export GAME_LIBRARY_PATH=$RESULT
    exec ${jre}/bin/java -jar $out/libexec/FTB_Launcher.jar
    EOF

    chmod +x $out/bin/ftb
  '';
}

technic.nix

{ stdenv, xorg, jdk, mesa, openal, libpulseaudio, ... }:

stdenv.mkDerivation {
  name = "technic";
  src = ./TechnicLauncher.jar;
  buildInputs = with xorg; [ libX11 libXext libXcursor libXrandr libXxf86vm jdk mesa openal libpulseaudio ];
  buildCommand = ''
    mkdir -pv $out/libexec/ $out/bin/
    cp -v $src $out/libexec/TechnicLauncher.jar

    RESULT=
    for x in $buildInputs; do
      RESULT=$x/lib/:$RESULT
    done

    cat <<EOF > $out/bin/technic
    #!${stdenv.shell}
    export LD_LIBRARY_PATH=/run/opengl-driver/lib:$RESULT
    export GAME_LIBRARY_PATH=/run/opengl-driver/lib:$RESULT
    exec ${jdk}/bin/java -jar $out/libexec/TechnicLauncher.jar
    EOF

    chmod +x $out/bin/technic
  '';
}