class Webp < Formula
  desc "Image format providing lossless and lossy compression for web images"
  homepage "https://developers.google.com/speed/webp/"
  url "http://downloads.webmproject.org/releases/webp/libwebp-0.6.0.tar.gz"
  sha256 "c928119229d4f8f35e20113ffb61f281eda267634a8dc2285af4b0ee27cf2b40"

  bottle do
    cellar :any
    sha256 "4ccfbbb42e4b718ab6eec838b50be3ae36da1ecc6f00d3a438d80c9220936247" => :sierra
    sha256 "cd0d20f0410b96f7564a0ccae776fcb2246030a8052a709ae3e5a3dd200fe6f3" => :el_capitan
    sha256 "a3db82a59e4726452ff8b5c9352e016571e6fb1b0713180d7b6ccc7c5b64541d" => :yosemite
  end

  head do
    url "https://chromium.googlesource.com/webm/libwebp.git"
    depends_on "autoconf" => :build
    depends_on "automake" => :build
    depends_on "libtool" => :build
  end

  depends_on "libpng"
  depends_on "jpeg" => :recommended
  depends_on "libtiff" => :optional
  depends_on "giflib" => :optional

  def install
    system "./autogen.sh" if build.head?

    system "./configure", "--disable-dependency-tracking",
                          "--disable-gl",
                          "--enable-libwebpmux",
                          "--enable-libwebpdemux",
                          "--enable-libwebpdecoder",
                          "--prefix=#{prefix}"
    system "make", "install"
  end

  test do
    system bin/"cwebp", test_fixtures("test.png"), "-o", "webp_test.png"
    system bin/"dwebp", "webp_test.png", "-o", "webp_test.webp"
    assert File.exist?("webp_test.webp")
  end
end