class Zsh < Formula
  desc "UNIX shell (command interpreter)"
  homepage "https://www.zsh.org/"
  url "https://downloads.sourceforge.net/project/zsh/zsh/5.4.2/zsh-5.4.2.tar.gz"
  mirror "https://www.zsh.org/pub/zsh-5.4.2.tar.gz"
  sha256 "957bcdb2c57f64c02f673693ea5a7518ef24b6557aeb3a4ce222cefa6d74acc9"
  revision 1

  bottle do
    sha256 "5bb5aecd8c5341fbb670489f1c1388ce02561bae2c5ba6d3e80f5d3911f81abf" => :high_sierra
    sha256 "e12f51411a259c9392384f4bc552dac0980ce2004f4f7560d3dfabe6ad36a1eb" => :sierra
    sha256 "28db7180a903334df90161bc33fd975ae289a13b6102ad1ef228d28dca04e58e" => :el_capitan
  end

  head do
    url "https://git.code.sf.net/p/zsh/code.git"
    depends_on "autoconf" => :build
  end

  option "without-etcdir", "Disable the reading of Zsh rc files in /etc"
  option "with-unicode9", "Build with Unicode 9 character width support"

  deprecated_option "disable-etcdir" => "without-etcdir"

  depends_on "gdbm"
  depends_on "pcre"

  resource "htmldoc" do
    url "https://downloads.sourceforge.net/project/zsh/zsh-doc/5.4.2/zsh-5.4.2-doc.tar.xz"
    mirror "https://www.zsh.org/pub/zsh-5.4.2-doc.tar.xz"
    sha256 "5229cc93ebe637a07deb5b386b705c37a50f4adfef788b3c0f6647741df4f6bd"
  end

  def install
    # Fix dyld: Symbol not found: _open_memstream
    if MacOS.version == :sierra && MacOS::Xcode.installed? &&
       MacOS::Xcode.version >= "9.0"
      ENV["ac_cv_func_open_memstream"] = "no"
    end

    system "Util/preconfig" if build.head?

    args = %W[
      --prefix=#{prefix}
      --enable-fndir=#{pkgshare}/functions
      --enable-scriptdir=#{pkgshare}/scripts
      --enable-site-fndir=#{HOMEBREW_PREFIX}/share/zsh/site-functions
      --enable-site-scriptdir=#{HOMEBREW_PREFIX}/share/zsh/site-scripts
      --enable-runhelpdir=#{pkgshare}/help
      --enable-cap
      --enable-maildir-support
      --enable-multibyte
      --enable-pcre
      --enable-zsh-secure-free
      --with-tcsetpgrp
    ]

    args << "--enable-unicode9" if build.with? "unicode9"

    if build.without? "etcdir"
      args << "--disable-etcdir"
    else
      args << "--enable-etcdir=/etc"
    end

    system "./configure", *args

    # Do not version installation directories.
    inreplace ["Makefile", "Src/Makefile"],
      "$(libdir)/$(tzsh)/$(VERSION)", "$(libdir)"

    if build.head?
      # disable target install.man, because the required yodl comes neither with macOS nor Homebrew
      # also disable install.runhelp and install.info because they would also fail or have no effect
      system "make", "install.bin", "install.modules", "install.fns"
    else
      system "make", "install"
      system "make", "install.info"

      resource("htmldoc").stage do
        (pkgshare/"htmldoc").install Dir["Doc/*.html"]
      end
    end
  end

  test do
    assert_equal "homebrew", shell_output("#{bin}/zsh -c 'echo homebrew'").chomp
    system bin/"zsh", "-c", "printf -v hello -- '%s'"
  end
end