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/v2018.03.19.00.tar.gz"
  sha256 "107d56a2f4cdb570add0cae76e7e2161bbdd8d2e1b393afc9019cd6a0a87e0ad"
  head "https://github.com/facebook/folly.git"

  bottle do
    cellar :any
    sha256 "67a8d1835ba1f7e10cf97405cdee5d2741afbcdf2989a30c271728ee8aed9f3f" => :high_sierra
    sha256 "d9e02bda5c563d70054357218878ee3f3e8c224a7f00b1644f82ea31b653f6f7" => :sierra
    sha256 "b343b664679308d57a6b4a2bb40caec2cce53bc311e058ac83ffe1de64f4acf4" => :el_capitan
  end

  depends_on "autoconf" => :build
  depends_on "automake" => :build
  depends_on "libtool" => :build
  depends_on "pkg-config" => :build
  depends_on "double-conversion"
  depends_on "glog"
  depends_on "gflags"
  depends_on "boost"
  depends_on "libevent"
  depends_on "xz"
  depends_on "snappy"
  depends_on "lz4"
  depends_on "openssl"

  # https://github.com/facebook/folly/issues/451
  depends_on :macos => :el_capitan

  needs :cxx11

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

  def install
    ENV.cxx11

    cd "folly" do
      system "autoreconf", "-fvi"
      system "./configure", "--prefix=#{prefix}", "--disable-silent-rules",
                            "--disable-dependency-tracking"
      system "make"
      system "make", "install"
    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++11", "test.cc", "-I#{include}", "-L#{lib}",
                    "-lfolly", "-o", "test"
    system "./test"
  end
end