class Octave < Formula
  desc "High-level interpreted language for numerical computing"
  homepage "https://www.gnu.org/software/octave/index.html"
  url "https://ftp.gnu.org/gnu/octave/octave-5.1.0.tar.xz"
  mirror "https://ftpmirror.gnu.org/octave/octave-5.1.0.tar.xz"
  sha256 "87b4df6dfa28b1f8028f69659f7a1cabd50adfb81e1e02212ff22c863a29454e"
  revision 2

  bottle do
    sha256 "6bb8497839d6f7872efcd6acad0216f443420e097a9b7fad44835823e1c0e735" => :mojave
    sha256 "d1de53a30f002d8b7ec3a6065994c46d8cbd4830aa7e199f572baff48723c6e6" => :high_sierra
    sha256 "7a648cff129ec85a5ee9417a0339a3b804756f7958585b707c015d322d220b15" => :sierra
  end

  head do
    url "https://hg.savannah.gnu.org/hgweb/octave", :branch => "default", :using => :hg

    depends_on "autoconf" => :build
    depends_on "automake" => :build
    depends_on "bison" => :build
    depends_on "icoutils" => :build
    depends_on "librsvg" => :build
  end

  # Complete list of dependencies at https://wiki.octave.org/Building
  depends_on "gnu-sed" => :build # https://lists.gnu.org/archive/html/octave-maintainers/2016-09/msg00193.html
  depends_on :java => ["1.6+", :build]
  depends_on "pkg-config" => :build
  depends_on "arpack"
  depends_on "epstool"
  depends_on "fftw"
  depends_on "fig2dev"
  depends_on "fltk"
  depends_on "fontconfig"
  depends_on "freetype"
  depends_on "gcc" # for gfortran
  depends_on "ghostscript"
  depends_on "gl2ps"
  depends_on "glpk"
  depends_on "gnuplot"
  depends_on "graphicsmagick"
  depends_on "hdf5"
  depends_on "libsndfile"
  depends_on "libtool"
  depends_on "pcre"
  depends_on "portaudio"
  depends_on "pstoedit"
  depends_on "qhull"
  depends_on "qrupdate"
  depends_on "qt"
  depends_on "readline"
  depends_on "suite-sparse"
  depends_on "sundials"
  depends_on "texinfo"
  depends_on "veclibfort"

  # Dependencies use Fortran, leading to spurious messages about GCC
  cxxstdlib_check :skip

  def install
    # Default configuration passes all linker flags to mkoctfile, to be
    # inserted into every oct/mex build. This is unnecessary and can cause
    # cause linking problems.
    inreplace "src/mkoctfile.in.cc",
              /%OCTAVE_CONF_OCT(AVE)?_LINK_(DEPS|OPTS)%/,
              '""'

    # Qt 5.12 compatibility
    # https://savannah.gnu.org/bugs/?55187
    ENV["QCOLLECTIONGENERATOR"] = "qhelpgenerator"
    # These "shouldn't" be necessary, but the build breaks without them.
    # https://savannah.gnu.org/bugs/?55883
    ENV["QT_CPPFLAGS"]="-I#{Formula["qt"].opt_include}"
    ENV.append "CPPFLAGS", "-I#{Formula["qt"].opt_include}"
    ENV["QT_LDFLAGS"]="-F#{Formula["qt"].opt_lib}"
    ENV.append "LDFLAGS", "-F#{Formula["qt"].opt_lib}"

    system "./bootstrap" if build.head?
    system "./configure", "--prefix=#{prefix}",
                          "--disable-dependency-tracking",
                          "--disable-silent-rules",
                          "--enable-link-all-dependencies",
                          "--enable-shared",
                          "--disable-static",
                          "--with-hdf5-includedir=#{Formula["hdf5"].opt_include}",
                          "--with-hdf5-libdir=#{Formula["hdf5"].opt_lib}",
                          "--with-x=no",
                          "--with-blas=-L#{Formula["veclibfort"].opt_lib} -lvecLibFort",
                          "--with-portaudio",
                          "--with-sndfile"
    system "make", "all"

    # Avoid revision bumps whenever fftw's or gcc's Cellar paths change
    inreplace "src/mkoctfile.cc" do |s|
      s.gsub! Formula["fftw"].prefix.realpath, Formula["fftw"].opt_prefix
      s.gsub! Formula["gcc"].prefix.realpath, Formula["gcc"].opt_prefix
    end

    # Make sure that Octave uses the modern texinfo at run time
    rcfile = buildpath/"scripts/startup/site-rcfile"
    rcfile.append_lines "makeinfo_program(\"#{Formula["texinfo"].opt_bin}/makeinfo\");"

    system "make", "install"
  end

  test do
    system bin/"octave", "--eval", "(22/7 - pi)/pi"
    # This is supposed to crash octave if there is a problem with veclibfort
    system bin/"octave", "--eval", "single ([1+i 2+i 3+i]) * single ([ 4+i ; 5+i ; 6+i])"
  end
end