class Emscripten < Formula
  desc "LLVM bytecode to JavaScript compiler"
  homepage "https://kripken.github.io/emscripten-site/"

  stable do
    url "https://github.com/kripken/emscripten/archive/1.35.2.tar.gz"
    sha256 "56feaa3037ec72e2d5299b0a92d7e3b9e1da164db32338c1fe02fe3ca68d8adb"

    resource "fastcomp" do
      url "https://github.com/kripken/emscripten-fastcomp/archive/1.35.2.tar.gz"
      sha256 "3bbc7990138381b0cbdac39f83afee76fa143efe81dba4939c1f514dccc307a3"
    end

    resource "fastcomp-clang" do
      url "https://github.com/kripken/emscripten-fastcomp-clang/archive/1.35.2.tar.gz"
      sha256 "5f7090fe66b9462e172cb7a889d9044aa301ffc946072293dd2b269973f358ce"
    end
  end

  bottle do
    sha256 "198eb3d39472c8807b9a86e5e7c433262562f2315c212181a54f6b6e8ca7aaf0" => :el_capitan
    sha256 "01b436990a411cff5c3b874eaa48bbd6aa078c6ed8b5db072650d0b2a0d4587e" => :yosemite
    sha256 "53c3c5f2965e1e6e48b64e2c54fbb745f5abd08116991556f02a776449a9fbb8" => :mavericks
  end

  head do
    url "https://github.com/kripken/emscripten.git", :branch => "incoming"

    resource "fastcomp" do
      url "https://github.com/kripken/emscripten-fastcomp.git", :branch => "incoming"
    end

    resource "fastcomp-clang" do
      url "https://github.com/kripken/emscripten-fastcomp-clang.git", :branch => "incoming"
    end
  end

  needs :cxx11

  depends_on :python if MacOS.version <= :snow_leopard
  depends_on "node"
  depends_on "closure-compiler" => :optional
  depends_on "yuicompressor"

  def install
    ENV.cxx11
    # OSX doesn't provide a "python2" binary so use "python" instead.
    python2_shebangs = `grep --recursive --files-with-matches ^#!/usr/bin/.*python2$ #{buildpath}`
    python2_shebang_files = python2_shebangs.lines.sort.uniq
    python2_shebang_files.map! { |f| Pathname(f.chomp) }
    python2_shebang_files.reject! &:symlink?
    inreplace python2_shebang_files, %r{^(#!/usr/bin/.*python)2$}, "\\1"

    # All files from the repository are required as emscripten is a collection
    # of scripts which need to be installed in the same layout as in the Git
    # repository.
    libexec.install Dir["*"]

    (buildpath/"fastcomp").install resource("fastcomp")
    (buildpath/"fastcomp/tools/clang").install resource("fastcomp-clang")

    args = [
      "--prefix=#{libexec}/llvm",
      "--enable-optimized",
      "--enable-targets=host,js",
      "--disable-assertions",
      "--disable-bindings",
    ]

    mkdir "fastcomp/build" do
      system "../configure", *args
      system "make"
      system "make", "install"
    end

    %w[em++ em-config emar emcc emcmake emconfigure emlink.py emmake
       emranlib emrun emscons].each do |emscript|
      bin.install_symlink libexec/emscript
    end
  end

  def caveats; <<-EOS.undent
    Manually set LLVM_ROOT to
      #{opt_libexec}/llvm/bin
    in ~/.emscripten after running `emcc` for the first time.
    EOS
  end

  test do
    system "#{libexec}/llvm/bin/llvm-config", "--version"
  end
end