class Runit < Formula
  desc "Collection of tools for managing UNIX services"
  homepage "http://smarden.org/runit"
  url "http://smarden.org/runit/runit-2.1.2.tar.gz"
  sha256 "6fd0160cb0cf1207de4e66754b6d39750cff14bb0aa66ab49490992c0c47ba18"

  bottle do
    cellar :any_skip_relocation
    rebuild 1
    sha256 "c6e5b49ab3601824db1969967c5ba4a0d35fa65841cfa2ec1d50fcca968fcf05" => :catalina
    sha256 "3c684c031305f98a2d24e904b6fc3301a71f0089e84e814028bad8ab05658cae" => :mojave
    sha256 "a66fbfb0258db267c5a3a3d7790fe4b5224478e7ecc1377a9a877118d5e27be5" => :high_sierra
  end

  def install
    # Runit untars to 'admin/runit-VERSION'
    cd "runit-#{version}" do
      # Per the installation doc on macOS, we need to make a couple changes.
      system "echo 'cc -Xlinker -x' >src/conf-ld"
      inreplace "src/Makefile", / -static/, ""

      inreplace "src/sv.c", "char *varservice =\"/service/\";", "char *varservice =\"#{var}/service/\";"
      system "package/compile"

      # The commands are compiled and copied into the 'command' directory and
      # names added to package/commands. Read the file for the commands and
      # install them in homebrew.
      rcmds = File.read("package/commands")

      rcmds.split("\n").each do |r|
        bin.install("command/#{r.chomp}")
        man8.install("man/#{r.chomp}.8")
      end

      (var + "service").mkpath
    end
  end

  def caveats; <<~EOS
    This formula does not install runit as a replacement for init.
    The service directory is #{var}/service instead of /service.

    A system service that runs runsvdir with the default service directory is
    provided. Alternatively you can run runsvdir manually:

         runsvdir -P #{var}/service

    Depending on the services managed by runit, this may need to start as root.
  EOS
  end

  plist_options :manual => "runit"

  def plist; <<~EOS
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
    <plist version="1.0">
      <dict>
        <key>Label</key>
        <string>#{plist_name}</string>
        <key>ProgramArguments</key>
        <array>
          <string>#{opt_bin}/runsvdir</string>
          <string>-P</string>
          <string>#{var}/service</string>
        </array>
        <key>EnvironmentVariables</key>
        <dict>
          <key>PATH</key>
          <string>/usr/bin:/bin:/usr/sbin:/sbin:#{opt_bin}</string>
        </dict>
        <key>KeepAlive</key>
        <dict>
          <key>Crashed</key>
          <true/>
          <key>SuccessfulExit</key>
          <false/>
        </dict>
        <key>ProcessType</key>
        <string>Background</string>
       <key>StandardErrorPath</key>
        <string>#{var}/log/runit.log</string>
        <key>StandardOutPath</key>
        <string>#{var}/log/runit.log</string>
      </dict>
    </plist>
  EOS
  end

  test do
    assert_match "usage: #{bin}/runsvdir [-P] dir", shell_output("#{bin}/runsvdir 2>&1", 1)
  end
end