# This is the source.sh script. It is executed by BPM in a temporary directory when compiling a source package
# BPM Expects the source code to be extracted into the automatically created 'source' directory which can be accessed using $BPM_SOURCE
# BPM Expects the output files to be present in the automatically created 'output' directory which can be accessed using $BPM_OUTPUT

DOWNLOAD="https://github.com/llvm/llvm-project/releases/download/llvmorg-${BPM_PKG_VERSION}/lld-${BPM_PKG_VERSION}.src.tar.xz"
DOWNLOAD_LLVM="https://github.com/llvm/llvm-project/releases/download/llvmorg-${BPM_PKG_VERSION}/llvm-${BPM_PKG_VERSION}.src.tar.xz"
DOWNLOAD_LIBUNWIND="https://github.com/llvm/llvm-project/releases/download/llvmorg-${BPM_PKG_VERSION}/libunwind-${BPM_PKG_VERSION}.src.tar.xz"
DOWNLOAD_CMAKE_MODULES="https://github.com/llvm/llvm-project/releases/download/llvmorg-${BPM_PKG_VERSION}/cmake-${BPM_PKG_VERSION}.src.tar.xz"
FILENAME="${DOWNLOAD##*/}"
FILENAME_LLVM="${DOWNLOAD_LLVM##*/}"
FILENAME_LIBUNWIND="${DOWNLOAD_LIBUNWIND##*/}"
FILENAME_CMAKE_MODULES="${DOWNLOAD_CMAKE_MODULES##*/}"

# The prepare function is executed in the root of the temp directory
# This function is used for downloading files and putting them into the correct location
prepare() {
  wget "$DOWNLOAD"
  wget "$DOWNLOAD_LLVM"
  wget "$DOWNLOAD_LIBUNWIND"
  wget "$DOWNLOAD_CMAKE_MODULES"
  tar -xvf "$FILENAME" --strip-components=1 -C "$BPM_SOURCE"
  tar -xvf "$FILENAME_LLVM"
  tar -xvf "$FILENAME_LIBUNWIND"
  tar -xvf "$FILENAME_CMAKE_MODULES"

  mv llvm-${BPM_PKG_VERSION}.src llvm
  mv libunwind-${BPM_PKG_VERSION}.src libunwind
  mv cmake-${BPM_PKG_VERSION}.src cmake

  cd "$BPM_SOURCE"
  # Fix to https://github.com/llvmenv/llvmenv/issues/115
  ln -s ../../libunwind/include/mach-o MachO/mach-o
}

# The build function is executed in the source directory
# This function is used to compile the source code
build() {
  mkdir build
  cd build

  cmake -DCMAKE_BUILD_TYPE=Release \
        -DCMAKE_INSTALL_PREFIX=/usr \
        -DCMAKE_INSTALL_DOCDIR=share/doc \
        -DCMAKE_SKIP_RPATH=ON \
        -DBUILD_SHARED_LIBS=ON \
        -DLLVM_BUILD_DOCS=ON \
        -DLLVM_INCLUDE_TESTS=ON \
        -DLLVM_LINK_LLVM_DYLIB=ON \
        -DLLVM_MAIN_SRC_DIR="${BPM_SOURCE}/llvm" \
        -G Ninja ..
  ninja  
}

# The check function is executed in the source directory
# This function is used to run tests to verify the package has been compiled correctly
check() {
  cd build
  ninja check-lld
}

# The package function is executed in the source directory
# This function is used to move the compiled files into the output directory
package() {
  cd build
  DESTDIR="$BPM_OUTPUT" ninja install

  install -Dm644 "$BPM_SOURCE"/LICENSE.TXT "$BPM_OUTPUT"/usr/share/licenses/lld/LICENSE.TXT
}