# Maintainer: Felix Kauselmann <licorn@gmail.com>

pkgname=libpdfium-nojs
pkgver=6367.r1.7b90b15a21
pkgrel=1
pkgdesc="Open-source PDF rendering engine."
arch=('x86_64')
url="https://pdfium.googlesource.com/pdfium/"
license=('BSD')
depends=('freetype2' 'lcms2' 'libjpeg' 'openjpeg2' 'icu')
conflicts=('libpdfium-bin')
provides=('libpdfium')
makedepends=('git' 'python' 'gn' 'ninja')

source=("git+https://pdfium.googlesource.com/pdfium"
    "git+https://chromium.googlesource.com/chromium/src/build.git"
    "git+https://chromium.googlesource.com/chromium/src/third_party/abseil-cpp"
    "libpdfium.pc"
    )

md5sums=('SKIP'
         'SKIP'
         'SKIP'
         'feb270967925a0844b1b9a9e15288eb3')

pkgver() {

  cd $srcdir/pdfium
  
  # Version = branch name/number + number of commits since branch creation
  # + short head
  printf  "%s.r%s.%s" $(git rev-parse --abbrev-ref HEAD | cut -d '/' -f2)\
   $(git rev-list --count main..) $(git rev-parse --short HEAD)

}

prepare() {

  cd "$srcdir/pdfium"

  ln -sf $srcdir/build build
  ln -sf $srcdir/abseil-cpp third_party/abseil-cpp

  # Pdfium is developed alongside Chromium and does not provide releases
  # Upstream recommends using Chromium's dev channels instead

  # Extract pdfium branch name used in stable channel from chrome version history and do
  # a checkout
  
  chrome_version="$(curl https://versionhistory.googleapis.com/v1/chrome/platforms/linux/channels/stable/versions/all/releases | grep 'version' | head -1 | cut -d'.' -f 3)"
  # chrome_version="$(curl https://versionhistory.googleapis.com/v1/chrome/platforms/linux/channels/beta/versions/all/releases | grep 'version' | head -1 | cut -d'.' -f 3)"
  # chrome_version="$(curl https://versionhistory.googleapis.com/v1/chrome/platforms/linux/channels/dev/versions/all/releases | grep 'version' | head -1 | cut -d'.' -f 3)"

  git checkout "chromium/$chrome_version"

  # Extract build repo revision needed from DEPS file and do a checkout
  cd "$srcdir/pdfium/build"
  # Use a newer build revision to work around a build system bug in v6367
  if [[ $chrome_version -gt 6367 ]]
  then
    git checkout $(awk '/build_revision/ {print substr($2,2,40)}' $srcdir/pdfium/DEPS) -q
  else
    git checkout bbc1efa4ce09a306328744c508d208407d5978a6 -q
  fi
  
  # Extract abseil-cpp repo revision needed from DEPS file and do a checkout
  cd "$srcdir/pdfium/third_party/abseil-cpp"
  git checkout $(awk '/abseil_revision/ {print substr($2,2,40)}' $srcdir/pdfium/DEPS) -q

  # Patch abseil build to be static
  sed -i 's/component(/static_library(/' BUILD.gn
  sed -i 's/is_component_build(/false/' BUILD.gn

  # Use system provided icu library (unbundling)
  mkdir -p "$srcdir/pdfium/third_party/icu"
  ln -sf "$srcdir/build/linux/unbundle/icu.gn" "$srcdir/pdfium/third_party/icu/BUILD.gn"

  # Download and decode shim header script needed to unbundle icu (gittiles is weird)
  mkdir -p "$srcdir/pdfium/tools/generate_shim_headers/"
  echo "Downloading generate_shim_headers script from Chromium."
  curl https://chromium.googlesource.com/chromium/src/+/main/tools/generate_shim_headers/generate_shim_headers.py?format=TEXT \
    | base64 --decode > "$srcdir/pdfium/tools/generate_shim_headers/generate_shim_headers.py"
  echo "Done."
  
  # Create fake gclient_args.gni file to satisfy include list for build/config/compiler/compiler.gni
  touch "$srcdir/build/config/gclient_args.gni"
  
  # Exclude test fonts from build
  cd "$srcdir/pdfium/testing/"
  sed -i '/"\/\/third_party\/test_fonts",/s/^/#/g' BUILD.gn
  
} 

build() {

  cd "$srcdir/pdfium"

  local _flags=(
      'is_clang=false'
      'use_sysroot=false'
      'is_debug=false'
      'symbol_level=0'
      'pdf_enable_v8=false'
      'pdf_enable_xfa=false'
      'treat_warnings_as_errors=false'
      'use_system_libjpeg=true'
      'use_system_zlib=true'
      'pdf_bundle_freetype=false'
      'use_system_freetype=true'
      'use_system_lcms2=true'
      'use_system_libpng=true'
      'use_custom_libcxx=false'
      'enable_safe_libcxx=false'
      'pdf_is_standalone = true'
      'use_system_libopenjpeg2 = true'
      'is_component_build = true'
      'pdf_use_partition_alloc = false'
  )
  
  gn gen out/Release --args="${_flags[*]}"
  ninja -C out/Release pdfium

  # set pdfium version in pc file
  sed "s/@VERSION@/${pkgver}/g" -i "${srcdir}/libpdfium.pc"

}

package() {

  cd "$srcdir/pdfium"

  install -D -m644 LICENSE "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE"
  install -D public/*.h --target-directory="${pkgdir}/usr/include/pdfium"
  install -D public/cpp/* --target-directory="${pkgdir}/usr/include/pdfium/cpp"
  install -D docs/* --target-directory="${pkgdir}/usr/share/doc/pdfium"
  install -Dm755 out/Release/libpdfium.so --target-directory="${pkgdir}/usr/lib"
  install -Dm644 ${srcdir}/libpdfium.pc --target-directory=${pkgdir}/usr/lib/pkgconfig

}