class Folly < Formula
  desc "Collection of reusable C++ library artifacts developed at Facebook"
  homepage "https://github.com/facebook/folly"
  url "https://github.com/facebook/folly/archive/v2019.06.17.00.tar.gz"
  sha256 "dc7ee18b24521a842fc5f7166d44b3db7246354ba4b22aa58b6a2444bb6cae6b"
  head "https://github.com/facebook/folly.git"

  bottle do
    cellar :any
    sha256 "eedccf1f8b6c8c4964ba3d34b54d0c19548e294ade86f2f787ea3c2d97708534" => :mojave
    sha256 "5225faa9f9b6836d0d1830c8e0fbf1d38aa971f8d799f420791228349c9b509c" => :high_sierra
  end

  depends_on "cmake" => :build
  depends_on "pkg-config" => :build
  depends_on "boost"
  depends_on "double-conversion"
  depends_on "gflags"
  depends_on "glog"
  depends_on "libevent"
  depends_on "lz4"

  # https://github.com/facebook/folly/issues/966
  depends_on :macos => :high_sierra

  depends_on "openssl"
  depends_on "snappy"
  depends_on "xz"
  depends_on "zstd"

  # Known issue upstream. They're working on it:
  # https://github.com/facebook/folly/pull/445
  fails_with :gcc => "6"

  def install
    mkdir "_build" do
      args = std_cmake_args + %w[
        -DFOLLY_USE_JEMALLOC=OFF
      ]

      system "cmake", "..", *args, "-DBUILD_SHARED_LIBS=ON"
      system "make"
      system "make", "install"

      system "make", "clean"
      system "cmake", "..", *args, "-DBUILD_SHARED_LIBS=OFF"
      system "make"
      lib.install "libfolly.a", "folly/libfollybenchmark.a"
    end
  end

  test do
    (testpath/"test.cc").write <<~EOS
      #include <folly/FBVector.h>
      int main() {
        folly::fbvector<int> numbers({0, 1, 2, 3});
        numbers.reserve(10);
        for (int i = 4; i < 10; i++) {
          numbers.push_back(i * 2);
        }
        assert(numbers[6] == 12);
        return 0;
      }
    EOS
    system ENV.cxx, "-std=c++14", "test.cc", "-I#{include}", "-L#{lib}",
                    "-lfolly", "-o", "test"
    system "./test"
  end
end