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/1.35.0.tar.gz"
    sha256 "d9e84330ad97be018e5015e9cc6ecf3423d438f6a1a73f7ad359d4d1e8afa4b3"

    resource "fastcomp" do
      url "https://github.com/kripken/emscripten-fastcomp/archive/1.35.0.tar.gz"
      sha256 "e70aec0e821f2c0a00cb59219f48e279d85f38b1f749ba479d0d2edd6bb066c5"
    end

    resource "fastcomp-clang" do
      url "https://github.com/kripken/emscripten-fastcomp-clang/archive/1.35.0.tar.gz"
      sha256 "dc9b33f88124806b95648dec8b0b60b1520c7b52779471559e06e12630c8eb32"
    end
  end

  bottle do
    sha256 "979016f3e884da501400132f924bfc39b35b19a84be3efe57ff2fdd896bd74fa" => :el_capitan
    sha256 "0731e03a5c1d4b77fe2e41703cfc5a363fd6baa1f494c8118a5db0a6ff4ee662" => :yosemite
    sha256 "a6ccaaa8a885dd97d395091a3a6b9258b2d61a6a975fc42a7c195282b01f3b76" => :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",
    ]

    cd "fastcomp" 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