Merge pull request #215829 from Garmelon/godot-4-better-version-info

assert lib.asserts.assertOneOf "withPrecision" withPrecision [ "single" "double" ];

let

  options = {

    # Options from 'godot/SConstruct'

    platform = withPlatform;

    target = withTarget;

    precision = withPrecision; # Floating-point precision level

    # Options from 'godot/platform/linuxbsd/detect.py'

    pulseaudio = withPulseaudio; # Use PulseAudio

    dbus = withDbus; # Use D-Bus to handle screensaver and portal desktop settings

    speechd = withSpeechd; # Use Speech Dispatcher for Text-to-Speech support

    fontconfig = withFontconfig; # Use fontconfig for system fonts support

    udev = withUdev; # Use udev for gamepad connection callbacks

    touch = withTouch; # Enable touch events

  };

  mkSconsFlagsFromAttrSet = lib.mapAttrsToList (k: v:

    if builtins.isString v

    then "${k}=${v}"

    else "${k}=${builtins.toJSON v}");

in

stdenv.mkDerivation rec {

  pname = "godot";

  version = "4.1-stable";

  commitHash = "970459615f6b2b4151742ec6d7ef8559f87fd5c5";

  src = fetchFromGitHub {

    owner = "godotengine";

    repo = "godot";

    rev = version;

    rev = commitHash;

    hash = "sha256-v9qKrPYQz4c+xkSu/2ru7ZE5EzKVyXhmrxyHZQkng2U=";

  };

  enableParallelBuilding = true;

  # Options from 'godot/SConstruct' and 'godot/platform/linuxbsd/detect.py'

  sconsFlags = [ "production=true" ];

  # Set the build name which is part of the version. In official downloads, this

  # is set to 'official'. When not specified explicitly, it is set to

  # 'custom_build'. Other platforms packaging Godot (Gentoo, Arch, Flatpack

  # etc.) usually set this to their name as well.

  #

  # See also 'methods.py' in the Godot repo and 'build' in

  # https://docs.godotengine.org/en/stable/classes/class_engine.html#class-engine-method-get-version-info

  BUILD_NAME = "nixpkgs";

  # Required for the commit hash to be included in the version number.

  #

  # `methods.py` reads the commit hash from `.git/HEAD` and manually follows

  # refs. Since we just write the hash directly, there is no need to emulate any

  # other parts of the .git directory.

  #

  # See also 'hash' in

  # https://docs.godotengine.org/en/stable/classes/class_engine.html#class-engine-method-get-version-info

  preConfigure = ''

    sconsFlags+=" ${

      lib.concatStringsSep " "

      (lib.mapAttrsToList (k: v: "${k}=${builtins.toJSON v}") options)

    }"

    mkdir -p .git

    echo ${commitHash} > .git/HEAD

  '';

  sconsFlags = mkSconsFlagsFromAttrSet {

    # Options from 'SConstruct'

    production = true; # Set defaults to build Godot for use in production

    platform = withPlatform;

    target = withTarget;

    precision = withPrecision; # Floating-point precision level

    # Options from 'platform/linuxbsd/detect.py'

    pulseaudio = withPulseaudio; # Use PulseAudio

    dbus = withDbus; # Use D-Bus to handle screensaver and portal desktop settings

    speechd = withSpeechd; # Use Speech Dispatcher for Text-to-Speech support

    fontconfig = withFontconfig; # Use fontconfig for system fonts support

    udev = withUdev; # Use udev for gamepad connection callbacks

    touch = withTouch; # Enable touch events

  };

  outputs = [ "out" "man" ];

  installPhase = ''