# 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-${BPM_PKG_VERSION}/llvm-${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"
DOWNLOAD_THIRD_PARTY="https://github.com/llvm/llvm-project/releases/download/llvmorg-${BPM_PKG_VERSION}/third-party-${BPM_PKG_VERSION}.src.tar.xz"
FILENAME="${DOWNLOAD##*/}"
FILENAME_CMAKE_MODULES="${DOWNLOAD_CMAKE_MODULES##*/}"
FILENAME_THIRD_PARTY="${DOWNLOAD_THIRD_PARTY##*/}"

# 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_CMAKE_MODULES"
  wget "$DOWNLOAD_THIRD_PARTY"
  tar -xvf "$FILENAME" --strip-components=1 -C "$BPM_SOURCE"
  mkdir {cmake,third-party}
  tar -xvf "$FILENAME_CMAKE_MODULES" --strip-components=1 -C cmake
  tar -xvf "$FILENAME_THIRD_PARTY" --strip-components=1 -C third-party
}

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

  mkdir -v build
  cd build
  
  CC=gcc CXX=g++                              \
  cmake -DCMAKE_INSTALL_PREFIX=/usr           \
        -DLLVM_ENABLE_FFI=ON                  \
        -DCMAKE_BUILD_TYPE=Release            \
        -DLLVM_BUILD_LLVM_DYLIB=ON            \
        -DLLVM_LINK_LLVM_DYLIB=ON             \
        -DLLVM_ENABLE_RTTI=ON                 \
        -DLLVM_TARGETS_TO_BUILD="host"        \
        -DLLVM_BINUTILS_INCDIR=/usr/include   \
        -DLLVM_INCLUDE_BENCHMARKS=OFF         \
        -Wno-dev -G Ninja ..
  ninja
}

# 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="$BPM_OUTPUT" ninja install
  cp bin/FileCheck "$BPM_OUTPUT"/usr/bin
}