require "formula"

class Dmd < Formula
  homepage "http://dlang.org"
  url "https://github.com/D-Programming-Language/dmd/archive/v2.067.0.tar.gz"
  sha1 "663d27bc6a25028d54b139344a35476cf5b4dc23"

  bottle do
    sha256 "c73291ee736109820ddf6bcd7dec619e3b1090c6c0849a5a7b717e1a67a8603b" => :yosemite
    sha256 "2f04b67d50261ea74f4d580b5a180657020bb91d70d267dc47bf45e1d1bea6d1" => :mavericks
    sha256 "13c440997c04a64627c5d697844c7a7e42c379e2507334a32d6a632881516d68" => :mountain_lion
  end

  resource "druntime" do
    url "https://github.com/D-Programming-Language/druntime/archive/v2.067.0.tar.gz"
    sha1 "dd803d01d82c2bf9ef680d9b318955f674309747"
  end

  resource "phobos" do
    url "https://github.com/D-Programming-Language/phobos/archive/v2.067.0.tar.gz"
    sha1 "268447464389bd09a695ce4c0663f1bab283f041"
  end

  resource "tools" do
    url "https://github.com/D-Programming-Language/tools/archive/v2.067.0.tar.gz"
    sha1 "3d94855e46e39136ccd9b6765e8ffc1de37c95fa"
  end

  def install
    make_args = ["INSTALL_DIR=#{prefix}", "MODEL=#{Hardware::CPU.bits}", "-f", "posix.mak"]

    system "make", "SYSCONFDIR=#{etc}", "TARGET_CPU=X86", "RELEASE=1", *make_args

    bin.install "src/dmd"
    prefix.install "samples"
    man.install Dir["docs/man/*"]

    # A proper dmd.conf is required for later build steps:
    conf = buildpath/"dmd.conf"
    # Can't use opt_include or opt_lib here because dmd won't have been
    # linked into opt by the time this build runs:
    conf.write <<-EOS.undent
        [Environment]
        DFLAGS=-I#{include}/d2 -L-L#{lib}
        EOS
    etc.install conf
    install_new_dmd_conf

    make_args.unshift "DMD=#{bin}/dmd"

    (buildpath/"druntime").install resource("druntime")
    (buildpath/"phobos").install resource("phobos")

    system "make", "-C", "druntime", *make_args
    system "make", "-C", "phobos", "VERSION=#{buildpath}/VERSION", *make_args

    (include/"d2").install Dir["druntime/import/*"]
    cp_r ["phobos/std", "phobos/etc"], include/"d2"
    lib.install Dir["druntime/lib/*", "phobos/**/libphobos2.a"]


    resource("tools").stage do
      inreplace "posix.mak", "install: $(TOOLS) $(CURL_TOOLS)", "install: $(TOOLS) $(ROOT)/dustmite"
      system "make", "install", *make_args
    end
  end

  # Previous versions of this formula may have left in place an incorrect
  # dmd.conf.  If it differs from the newly generated one, move it out of place
  # and warn the user.
  # This must be idempotent because it may run from both install() and
  # post_install() if the user is running `brew install --build-from-source`.
  def install_new_dmd_conf
    conf = etc/"dmd.conf"

    # If the new file differs from conf, etc.install drops it here:
    new_conf = etc/"dmd.conf.default"
    # Else, we're already using the latest version:
    return unless new_conf.exist?

    backup = etc/"dmd.conf.old"
    opoo "An old dmd.conf was found and will be moved to #{backup}."
    mv conf, backup
    mv new_conf, conf
  end

  def post_install
    install_new_dmd_conf
  end

  test do
    system bin/"dmd", prefix/"samples/hello.d"
    system "./hello"
  end
end