class Boost < Formula
  desc "Collection of portable C++ source libraries"
  homepage "https://www.boost.org/"
  revision 1
  head "https://github.com/boostorg/boost.git"

  stable do
    url "https://dl.bintray.com/boostorg/release/1.64.0/source/boost_1_64_0.tar.bz2"
    sha256 "7bcc5caace97baa948931d712ea5f37038dbb1c5d89b43ad4def4ed7cb683332"

    # Remove for > 1.64.0
    # "Replace boost::serialization::detail::get_data function."
    # Upstream PR from 26 Jan 2017 https://github.com/boostorg/mpi/pull/39
    patch :p2 do
      url "https://github.com/boostorg/mpi/commit/f5bdcc1.patch"
      sha256 "c7af75a83fef90fdb9858bc988d64ca569ae8d940396b9bc60a57d63fca2587b"
    end
  end

  bottle do
    cellar :any
    sha256 "94c29d2d149a6383fa4050e7cb478e3dcae66895d78b0a0492d8fff63dd73a14" => :sierra
    sha256 "24ae06f30527b4b2375cc2c375ce1af22e4dc0db04dd65896c80231e46ea0ba8" => :el_capitan
    sha256 "ab391a24436ffb4e32dd580d4b0de42e25f822d985273f16595ee865d7a5d995" => :yosemite
  end

  option "with-icu4c", "Build regexp engine with icu support"
  option "without-single", "Disable building single-threading variant"
  option "without-static", "Disable building static library variant"
  option :cxx11

  deprecated_option "with-icu" => "with-icu4c"

  if build.cxx11?
    depends_on "icu4c" => [:optional, "c++11"]
  else
    depends_on "icu4c" => :optional
  end

  needs :cxx11 if build.cxx11?

  # fix error: no member named 'make_array' in namespace 'boost::serialization'
  # https://svn.boost.org/trac/boost/ticket/12978
  patch :p2 do
    url "https://github.com/boostorg/serialization/commit/1d86261.diff"
    sha256 "155f603a00975a1702808be072c1420964feac8323de39c111a9d3a363a4ed9a"
  end

  def install
    # Force boost to compile with the desired compiler
    open("user-config.jam", "a") do |file|
      file.write "using darwin : : #{ENV.cxx} ;\n"
    end

    # libdir should be set by --prefix but isn't
    bootstrap_args = ["--prefix=#{prefix}", "--libdir=#{lib}"]

    if build.with? "icu4c"
      icu4c_prefix = Formula["icu4c"].opt_prefix
      bootstrap_args << "--with-icu=#{icu4c_prefix}"
    else
      bootstrap_args << "--without-icu"
    end

    # Handle libraries that will not be built.
    without_libraries = ["python", "mpi"]

    # Boost.Log cannot be built using Apple GCC at the moment. Disabled
    # on such systems.
    without_libraries << "log" if ENV.compiler == :gcc

    bootstrap_args << "--without-libraries=#{without_libraries.join(",")}"

    # layout should be synchronized with boost-python and boost-mpi
    args = ["--prefix=#{prefix}",
            "--libdir=#{lib}",
            "-d2",
            "-j#{ENV.make_jobs}",
            "--layout=tagged",
            "--user-config=user-config.jam",
            "install"]

    if build.with? "single"
      args << "threading=multi,single"
    else
      args << "threading=multi"
    end

    if build.with? "static"
      args << "link=shared,static"
    else
      args << "link=shared"
    end

    # Trunk starts using "clang++ -x c" to select C compiler which breaks C++11
    # handling using ENV.cxx11. Using "cxxflags" and "linkflags" still works.
    if build.cxx11?
      args << "cxxflags=-std=c++11"
      if ENV.compiler == :clang
        args << "cxxflags=-stdlib=libc++" << "linkflags=-stdlib=libc++"
      end
    end

    system "./bootstrap.sh", *bootstrap_args
    system "./b2", "headers"
    system "./b2", *args
  end

  def caveats
    s = ""
    # ENV.compiler doesn't exist in caveats. Check library availability
    # instead.
    if Dir["#{lib}/libboost_log*"].empty?
      s += <<-EOS.undent

      Building of Boost.Log is disabled because it requires newer GCC or Clang.
      EOS
    end

    s
  end

  test do
    (testpath/"test.cpp").write <<-EOS.undent
      #include <boost/algorithm/string.hpp>
      #include <string>
      #include <vector>
      #include <assert.h>
      using namespace boost::algorithm;
      using namespace std;

      int main()
      {
        string str("a,b");
        vector<string> strVec;
        split(strVec, str, is_any_of(","));
        assert(strVec.size()==2);
        assert(strVec[0]=="a");
        assert(strVec[1]=="b");
        return 0;
      }
    EOS
    system ENV.cxx, "test.cpp", "-std=c++1y", "-L#{lib}", "-lboost_system", "-o", "test"
    system "./test"
  end
end