class S6 < Formula
  desc "Small & secure supervision software suite"
  homepage "https://skarnet.org/software/s6/"

  stable do
    url "https://skarnet.org/software/s6/s6-2.7.2.0.tar.gz"
    sha256 "af54fcbae7028a90bd12c7ee71a8f3954a74c6a4de376a427cc664587fb68a09"

    resource "skalibs" do
      url "https://skarnet.org/software/skalibs/skalibs-2.7.0.0.tar.gz"
      sha256 "96494d76669d2f8622511d5d616b6367801a42683c0bb11a8855114e5ccbd756"
    end

    resource "execline" do
      url "https://skarnet.org/software/execline/execline-2.5.0.1.tar.gz"
      sha256 "8d07d14e9e9abb1301e08be271313c4ffa5ddf7248fd262dda19588e78e31049"
    end
  end

  bottle do
    sha256 "de84ce2daa762ee81c1ba5580030e912072ec3659ff3ba876c4da11c27e146ed" => :mojave
    sha256 "fea087bab9413a1c548c6f9219d901e825be1cf1de5a46e1fd9ac0a3017a1b92" => :high_sierra
    sha256 "764172107342cea76c6a35b37ff830f5481efaa30410d89bd2b41ed1eda291e5" => :sierra
    sha256 "760b7806a4f4f9d7e78369406033fca48821933d3f7bdca70298efce5469471f" => :el_capitan
  end

  head do
    url "https://git.skarnet.org/cgi-bin/cgit.cgi/s6", :using => :git

    resource "skalibs" do
      url "https://git.skarnet.org/cgi-bin/cgit.cgi/skalibs", :using => :git
    end

    resource "execline" do
      url "https://git.skarnet.org/cgi-bin/cgit.cgi/execline", :using => :git
    end
  end

  def install
    resources.each { |r| r.stage(buildpath/r.name) }
    build_dir = buildpath/"build"

    cd "skalibs" do
      system "./configure", "--disable-shared", "--prefix=#{build_dir}", "--libdir=#{build_dir}/lib"
      system "make", "install"
    end

    cd "execline" do
      system "./configure",
        "--prefix=#{build_dir}",
        "--bindir=#{libexec}/execline",
        "--with-include=#{build_dir}/include",
        "--with-lib=#{build_dir}/lib",
        "--with-sysdeps=#{build_dir}/lib/skalibs/sysdeps",
        "--disable-shared"
      system "make", "install"
    end

    system "./configure",
      "--prefix=#{prefix}",
      "--libdir=#{build_dir}/lib",
      "--includedir=#{build_dir}/include",
      "--with-include=#{build_dir}/include",
      "--with-lib=#{build_dir}/lib",
      "--with-lib=#{build_dir}/lib/execline",
      "--with-sysdeps=#{build_dir}/lib/skalibs/sysdeps",
      "--disable-static",
      "--disable-shared"
    system "make", "install"

    # Some S6 tools expect execline binaries to be on the path
    bin.env_script_all_files(libexec/"bin", :PATH => "#{libexec}/execline:$PATH")
    sbin.env_script_all_files(libexec/"sbin", :PATH => "#{libexec}/execline:$PATH")
    (bin/"execlineb").write_env_script libexec/"execline/execlineb", :PATH => "#{libexec}/execline:$PATH"
  end

  test do
    (testpath/"test.eb").write <<~EOS
      foreground
      {
        sleep 1
      }
      "echo"
      "Homebrew"
    EOS
    assert_match "Homebrew", shell_output("#{bin}/execlineb test.eb")

    (testpath/"log").mkpath
    pipe_output("#{bin}/s6-log #{testpath}/log", "Test input\n", 0)
    assert_equal "Test input\n", File.read(testpath/"log/current")
  end
end