# Maintainer: Dylan Ferris <dylan@psilly.com>

# You must register at unrealengine.com and link your github account to access this private repo.
# @see https://wiki.archlinux.org/index.php/Unreal_Engine_4

# The source is over 8 GiB, with an extra 3 GiB of dependencies downloaded in build(), and may take several hours to compile.

pkgname='unreal-engine'
pkgver=4.18.0
# shellcheck disable=SC2034
{
  pkgrel=1
  pkgdesc='A 3D game engine by Epic Games which can be used non-commercially for free.'
  arch=('x86_64')
  url='https://www.unrealengine.com/'
  makedepends=('clang' 'mono' 'dos2unix' 'cmake' 'git')
  depends=('icu' 'xdg-user-dirs' 'sdl2' 'qt4' 'python')
  license=('custom:UnrealEngine')

  source=(
    "git+ssh://git@github.com/EpicGames/UnrealEngine.git#tag=$pkgver-release"
    'UE4Editor.desktop'
    'ignore-return-value-error.patch'
    'disable-pie.patch'
    'only-generate-makefile.patch'
    'xlocale-crash.patch'
  )

  sha256sums=(
    'SKIP'
    '46871ed662a3c97698be609d27da280d9000ec97183f1fa6592986f9910a2118'
    '918dff809a7e815343a8d233f704f52a910b8f01a9cb3d29de541a0334fecc7c'
    '32ab20e37f5595eff73fb7ee7916ecae19a47f72875f448663941621d166c13b'
    'dba4b1910dd6424d50a8d95a461c5cf3a96f3e7df0b015624d9bf1c97dc317d3'
    '6495cfd1b03aef86d0aca15d5389b4d8ee2d745e900a1956391afcbb4a14dafe'
  )

  # Package is 3 Gib smaller with "strip" but it's skipped because it takes a long time and generates many warnings
  options=(!strip)
}

prepare() {
  # shellcheck disable=SC2154
  ue4src="$srcdir/UnrealEngine/Engine/Source"
  patch "$ue4src/Programs/UnrealBuildTool/Platform/Linux/LinuxToolChain.cs" ignore-return-value-error.patch
  patch "$ue4src/Source/Programs/UnrealBuildTool/Platform/Linux/LinuxToolChain.cs" disable-pie.patch

  patch -p0 -i only-generate-makefile.patch
  # Source Code Accessors

  # CodeLite (Fully integrated)
  # cd $srcdir/UnrealEngine/Engine/Config/Linux && sed -i '10c\PreferredAccessor=CodeLiteSourceCodeAccessor' LinuxEngine.ini

  # Qt Creator
  # cd $srcdir/UnrealEngine/Engine/Plugins/Developer && git clone https://github.com/fire/QtCreatorSourceCodeAccess
  # cd $srcdir/UnrealEngine/Engine/Config/Linux && sed -i '10c\PreferredAccessor=QtCreatorSourceCodeAccessor' LinuxEngine.ini

  # VIM or EMACS
  # cd $srcdir/UnrealEngine/Engine/Plugins/Developer && git clone https://github.com/fire/SensibleEditorSourceCodeAccess
  # cd $srcdir/UnrealEngine/Engine/Config/Linux && sed -i '10c\PreferredAccessor=SensibleEditorSourceCodeAccessor' LinuxEngine.ini

  pkgbuild_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )"  && pwd )"
  echo "$pkgbuild_dir"
  # shellcheck disable=SC2164
  cd "$srcdir/UnrealEngine"

  # clean up old builds before building a new version
  #git clean -xdf

  ./Setup.sh
  patch "$ue4src/ThirdParty/Linux/LibCxx/include/c++/v1/__locale" "$pkgbuild_dir/xlocale-crash.patch"
  ./GenerateProjectFiles.sh
}

build() {
  # shellcheck disable=SC2164
  cd "$srcdir/UnrealEngine"

  # this should work instead of "git clean", but something leftover causes crashes
  #make ARGS=-clean

  # -j1 to force one  make job; the first time fails if there are multiple jobs
  make -j1
}

package() {
  # install dir
  dir="opt/$pkgname"

  # install .desktop
  if [ "$dir" != "opt/$pkgname" ] # set new path if dir changed
  then
    sed -i "5c\Path=/$dir/Engine/Binaries/Linux/" UE4Editor.desktop
    sed -i "6c\Exec=\'/$dir/Engine/Binaries/Linux/UE4Editor\' %F" UE4Editor.desktop
  fi
  # shellcheck disable=SC2154
  install -Dm644 UE4Editor.desktop "$pkgdir/usr/share/applications/UE4Editor.desktop"

  # shellcheck disable=SC2164
  cd "$srcdir/UnrealEngine"

  # license
  install -Dm644 LICENSE.md "$pkgdir/usr/share/licenses/UnrealEngine/LICENSE.md"

  # fix "could not chmod +x" warning when compiling c++ project
  chmod a+x Engine/Binaries/DotNET/IOS/IPhonePackager.exe

  # icon for .desktop file
  install -Dm644 Engine/Source/Programs/UnrealVS/Resources/Preview.png "$pkgdir/usr/share/pixmaps/UE4Editor.png"

  # engine
  install -d "$pkgdir/$dir/Engine"
  mv Engine/Binaries "$pkgdir/$dir/Engine/Binaries"
  mv Engine/Build "$pkgdir/$dir/Engine/Build"
  mv Engine/Config "$pkgdir/$dir/Engine/Config"
  mv Engine/Content "$pkgdir/$dir/Engine/Content"
  install -d "$pkgdir/$dir/Engine/DerivedDataCache" # editor needs this
  mv Engine/Documentation "$pkgdir/$dir/Engine/Documentation"
  mv Engine/Extras "$pkgdir/$dir/Engine/Extras"
  install -d "$pkgdir/$dir/Engine/Intermediate" # editor needs this, but not the contents
  mv Engine/Plugins "$pkgdir/$dir/Engine/Plugins"
  mv Engine/Programs "$pkgdir/$dir/Engine/Programs"
  mv Engine/Saved "$pkgdir/$dir/Engine/Saved"
  mv Engine/Shaders "$pkgdir/$dir/Engine/Shaders"
  mv Engine/Source "$pkgdir/$dir/Engine/Source" # the source cannot be redistributed, but seems to be needed to compile c++ projects

  # these folders needs to be writable, otherwise there is a segmentation fault when starting the editor
  chmod -R a+rwX "$pkgdir/$dir/Engine"

  # content
  mv FeaturePacks "$pkgdir/$dir/FeaturePacks"
  mv Samples "$pkgdir/$dir/Samples"
  mv Templates "$pkgdir/$dir/Templates"

  # build scripts, used by some plugins (CLion)
  install -Dm755 GenerateProjectFiles.sh "$pkgdir/$dir/GenerateProjectFiles.sh"
  install -Dm755 Setup.sh "$pkgdir/$dir/Setup.sh"
  install -Dm644 .ue4dependencies "$pkgdir/$dir/.ue4dependencies"
}

# vim:set ts=2 sw=2 et: