libass.rb

class Libass < Formula
  desc "Subtitle renderer for the ASS/SSA subtitle format"
  homepage "https://github.com/libass/libass"
  url "https://github.com/libass/libass/releases/download/0.15.2/libass-0.15.2.tar.xz"
  sha256 "1be2df9c4485a57d78bb18c0a8ed157bc87a5a8dd48c661961c625cb112832fd"
  license "ISC"

  head do
    url "https://github.com/libass/libass.git", branch: "master"

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

  depends_on "nasm" => :build
  depends_on "pkg-config" => :build
  depends_on "freetype"
  depends_on "fribidi"
  depends_on "harfbuzz"

  on_linux do
    depends_on "fontconfig"
  end

  def install
    opts  = Hardware::CPU.arm? ? "-mcpu=native " : "-march=native -mtune=native "
    opts += "-Ofast -flto=thin -funroll-loops -fomit-frame-pointer "
    opts += "-ffunction-sections -fdata-sections -fstrict-vtable-pointers -fwhole-program-vtables "
    opts += "-fforce-emit-vtables " if MacOS.version >= :mojave
    ENV.append "CFLAGS",      opts
    ENV.append "CPPFLAGS",    opts
    ENV.append "CXXFLAGS",    opts
    ENV.append "OBJCFLAGS",   opts
    ENV.append "OBJCXXFLAGS", opts
    ENV.append "LDFLAGS",     opts + " -dead_strip"

    system "autoreconf", "-i" if build.head?
    args = %W[
      --disable-dependency-tracking
      --prefix=#{prefix}
      --enable-large-tiles
    ]
    # libass uses coretext on macOS, fontconfig on Linux
    args << "--disable-fontconfig" if OS.mac?
    system "./configure", *args
    system "make", "install"
  end

  test do
    (testpath/"test.cpp").write <<~EOS
      #include "ass/ass.h"
      int main() {
        ASS_Library *library;
        ASS_Renderer *renderer;
        library = ass_library_init();
        if (library) {
          renderer = ass_renderer_init(library);
          if (renderer) {
            ass_renderer_done(renderer);
            ass_library_done(library);
            return 0;
          }
          else {
            ass_library_done(library);
            return 1;
          }
        }
        else {
          return 1;
        }
      }
    EOS
    system ENV.cc, "test.cpp", "-I#{include}", "-L#{lib}", "-lass", "-o", "test"
    system "./test"
  end
end