class Zimg < Formula
  desc "Scaling, colorspace conversion, and dithering library"
  homepage "https://github.com/sekrit-twc/zimg"
  url "https://github.com/sekrit-twc/zimg/archive/release-2.7.2.tar.gz"
  sha256 "8bfa286520fb5d8486889472e0a15e9a76d9d320dc0c8999e35804c90e5bf258"
  head "https://github.com/sekrit-twc/zimg.git"

  bottle do
    cellar :any
    sha256 "27800c470f10316c0ebd2b3695fea91d0727610cac0447be12a5ef643e39aa4c" => :high_sierra
    sha256 "b8a2d77385048e7815b04718450db58c49e6db24e1aaa055406aa8b6b83a19b5" => :sierra
    sha256 "5f102eba8c058136ae24df73437a92bc8830daa27ee6094fd87309c7134dae51" => :el_capitan
  end

  depends_on "autoconf" => :build
  depends_on "automake" => :build
  depends_on "libtool" => :build

  # Upstream has decided not to fix https://github.com/sekrit-twc/zimg/issues/52
  depends_on :macos => :el_capitan

  def install
    system "./autogen.sh"
    system "./configure", "--prefix=#{prefix}"
    system "make", "install"
  end

  test do
    (testpath/"test.c").write <<~EOS
      #include <assert.h>
      #include <zimg.h>

      int main()
      {
        zimg_image_format format;
        zimg_image_format_default(&format, ZIMG_API_VERSION);
        assert(ZIMG_MATRIX_UNSPECIFIED == format.matrix_coefficients);
        return 0;
      }
    EOS
    system ENV.cc, "test.c", "-L#{lib}", "-lzimg", "-o", "test"
    system "./test"
  end
end