klipper: fix cross runtime behavior

  makeWrapper,

  writeShellScript,

}:

let

  isCross = (stdenv.hostPlatform != stdenv.buildPlatform);

in

stdenv.mkDerivation rec {

  pname = "klipper";

  version = "0.13.0-unstable-2026-03-21";

    ))

  ];

  # we need to run this to prebuild the chelper.

  postBuild = ''

  # we need to run this to prebuild the chelper .so. However when cross

  # compiling, a patch is temporarily required during the build process to

  # prevent the build process from using dlopen() on this .so which has been

  # built for a foreign architecture. We then place the unpatched __init__.py

  # back, as this dlopen() call is required at runtime

  postBuild =

    if isCross then

      ''

        python ./chelper/__init__.py

        mv ./chelper/__init__unpatched.py ./chelper/__init__.py

      ''

    else

      ''

        python ./chelper/__init__.py

      '';

  prePatch = lib.optionalString isCross ''

    cp ./chelper/__init__.py ./chelper/__init__unpatched.py

  '';

  patches = lib.optionals isCross [

    # https://github.com/Klipper3d/klipper/pull/7254

    ./cross-ffi.patch

  ];

  # Python 3 is already supported but shebangs aren't updated yet

  postPatch = ''

    for file in klippy.py console.py parsedump.py; do

    done

    # needed for cross compilation

    substituteInPlace ./chelper/__init__.py \

    substituteInPlace ./chelper/__init__*.py \

      --replace 'GCC_CMD = "gcc"' 'GCC_CMD = "${stdenv.cc.targetPrefix}cc"'

  '';

  patches = lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [

    # https://github.com/Klipper3d/klipper/pull/7254

    ./cross-ffi.patch

  ];

  pythonInterpreter =

    (python3.withPackages (

      p: with p; [