#!/bin/bash

# version of clang we want to use
CLANG_VERSION=7
GITHUB_CLANG_VERSION=8
# version of libcxx and libcxxabi we want to use
CXX_VERSION=7.0.0
# version of CMake to use instead of the default one
CMAKE_VERSION=3.13.4
# version of ninja to use
NINJA_VERSION=1.8.2

# Install ninja
wget -q https://github.com/ninja-build/ninja/releases/download/v$NINJA_VERSION/ninja-linux.zip
unzip -q ninja-linux.zip
export PATH="$PWD:$PATH"

# Install CMake
mkdir -p cmake
cd cmake

sudo wget https://github.com/Kitware/CMake/releases/download/v$CMAKE_VERSION/cmake-$CMAKE_VERSION-Linux-x86_64.sh
sudo chmod +x ./cmake-$CMAKE_VERSION-Linux-x86_64.sh
sudo ./cmake-$CMAKE_VERSION-Linux-x86_64.sh --skip-license > /dev/null
sudo update-alternatives --install /usr/bin/cmake cmake `pwd`/bin/cmake 1000 --force

cd ..

# Steps for GitHub Workflows
if [[ "$GITHUB_WORKFLOW" ]]; then
    sudo wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
    sudo apt-get update
    sudo apt-get install clang-$GITHUB_CLANG_VERSION libc++-$GITHUB_CLANG_VERSION-dev libc++abi-$GITHUB_CLANG_VERSION-dev
    sudo apt-get install mesa-common-dev libxi-dev libxxf86vm-dev

    sudo update-alternatives --install /usr/bin/cc cc /usr/bin/clang-${GITHUB_CLANG_VERSION} 100
    sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++-${GITHUB_CLANG_VERSION} 100
fi