class Gnuplot < Formula
  desc "Command-driven, interactive function plotting"
  homepage "http://www.gnuplot.info/"
  url "https://downloads.sourceforge.net/project/gnuplot/gnuplot/5.2.6/gnuplot-5.2.6.tar.gz"
  sha256 "35dd8f013139e31b3028fac280ee12d4b1346d9bb5c501586d1b5a04ae7a94ee"
  revision 1

  bottle do
    rebuild 1
    sha256 "47903eca8637b8de9b803932795fe9dec4a45df4ea8ab61c51e2692501edce03" => :mojave
    sha256 "24a6c735fb69f8f7f016cf4ecadbe8d11022523c9d7160ef03160f41bf117aa7" => :high_sierra
    sha256 "5ef8fe2bebfcc2232f8ee414f0ce0c6b13482e212938d041dc55db7ea139eb10" => :sierra
  end

  head do
    url "https://git.code.sf.net/p/gnuplot/gnuplot-main.git"

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

  depends_on "pkg-config" => :build
  depends_on "gd"
  depends_on "libcerf"
  depends_on "lua"
  depends_on "pango"
  depends_on "qt"
  depends_on "readline"

  def install
    # Qt5 requires c++11 (and the other backends do not care)
    ENV.cxx11

    args = %W[
      --disable-dependency-tracking
      --disable-silent-rules
      --prefix=#{prefix}
      --with-readline=#{Formula["readline"].opt_prefix}
      --without-tutorial
      --disable-wxwidgets
      --with-qt
      --without-x
    ]

    system "./prepare" if build.head?
    system "./configure", *args
    ENV.deparallelize # or else emacs tries to edit the same file with two threads
    system "make"
    system "make", "install"
  end

  test do
    system "#{bin}/gnuplot", "-e", <<~EOS
      set terminal dumb;
      set output "#{testpath}/graph.txt";
      plot sin(x);
    EOS
    assert_predicate testpath/"graph.txt", :exist?
  end
end