#!/home/ew/bin/ruby
require 'unicorn/launcher'
require 'optparse'
require 'fileutils'

rails_pid = "#{Unicorn::HttpServer::START_CTX[:cwd]}/tmp/pids/unicorn.pid"
cmd = File.basename($0)
daemonize = false
listeners = []
options = { :listeners => listeners }
host, port = Unicorn::Const::DEFAULT_HOST, Unicorn::Const::DEFAULT_PORT
set_listener = false
ENV['RAILS_ENV'] ||= "development"
map_path = ENV['RAILS_RELATIVE_URL_ROOT']

opts = OptionParser.new("", 24, '  ') do |opts|
  opts.banner = "Usage: #{cmd} " \
                "[ruby options] [#{cmd} options] [rackup config file]"
  opts.separator "Ruby options:"

  lineno = 1
  opts.on("-e", "--eval LINE", "evaluate a LINE of code") do |line|
    eval line, TOPLEVEL_BINDING, "-e", lineno
    lineno += 1
  end

  opts.on("-d", "--debug", "set debugging flags (set $DEBUG to true)") do
    $DEBUG = true
  end

  opts.on("-w", "--warn", "turn warnings on for your script") do
    $-w = true
  end

  opts.on("-I", "--include PATH",
          "specify $LOAD_PATH (may be used more than once)") do |path|
    $LOAD_PATH.unshift(*path.split(/:/))
  end

  opts.on("-r", "--require LIBRARY",
          "require the library, before executing your script") do |library|
    require library
  end

  opts.separator "#{cmd} options:"

  # some of these switches exist for rackup command-line compatibility,

  opts.on("-o", "--host HOST",
          "listen on HOST (default: #{Unicorn::Const::DEFAULT_HOST})") do |h|
    host = h
    set_listener = true
  end

  opts.on("-p", "--port PORT", "use PORT (default: #{port})") do |p|
    port = p.to_i
    set_listener = true
  end

  opts.on("-E", "--env ENVIRONMENT",
          "use ENVIRONMENT for defaults (default: development)") do |e|
    ENV['RAILS_ENV'] = e
  end

  opts.on("-D", "--daemonize", "run daemonized in the background") do |d|
    daemonize = d ? true : false
  end

  # Unicorn-specific stuff
  opts.on("-l", "--listen {HOST:PORT|PATH}",
          "listen on HOST:PORT or PATH",
          "this may be specified multiple times",
          "(default: #{Unicorn::Const::DEFAULT_LISTEN})") do |address|
    listeners << address
  end

  opts.on("-c", "--config-file FILE", "Unicorn-specific config file") do |f|
    options[:config_file] = File.expand_path(f)
  end

  opts.on("-P", "--path PATH", "Runs Rails app mounted at a specific path.",
          "(default: /") do |v|
    ENV['RAILS_RELATIVE_URL_ROOT'] = map_path = v
  end

  # I'm avoiding Unicorn-specific config options on the command-line.
  # IMNSHO, config options on the command-line are redundant given
  # config files and make things unnecessarily complicated with multiple
  # places to look for a config option.

  opts.separator "Common options:"

  opts.on_tail("-h", "--help", "Show this message") do
    puts opts
    exit
  end

  opts.on_tail("-v", "--version", "Show version") do
    puts " v#{Unicorn::Const::UNICORN_VERSION}"
    exit
  end

  opts.parse! ARGV
end

config = ARGV[0] || (File.exist?('config.ru') ? 'config.ru' : nil)

if config && config =~ /\.ru$/
  # parse embedded command-line options in config.ru comments
  if File.open(config, "rb") { |fp| fp.sysread(fp.stat.size) } =~ /^#\\(.*)/
    opts.parse! $1.split(/\s+/)
  end
end

require 'pp' if $DEBUG

# this won't run until after forking if preload_app is false
app = lambda do ||
  # Load Rails and the private version of Rack it bundles.
  begin
    require 'config/boot'
  rescue LoadError => err
    abort "#$0 must be run inside RAILS_ROOT: #{err.inspect}"
  end
  defined?(::RAILS_ROOT) or abort "RAILS_ROOT not defined by config/boot"
  defined?(::RAILS_ENV) or abort "RAILS_ENV not defined by config/boot"
  defined?(::Rails::VERSION::STRING) or
    abort "Rails::VERSION::STRING not defined by config/boot"

  inner_app = case config
  when nil
    require 'config/environment'

    # it seems Rails >=2.2 support Rack, but only >=2.3 requires it
    old_rails = case ::Rails::VERSION::MAJOR
    when 0, 1 then true
    when 2 then Rails::VERSION::MINOR < 3 ? true : false
    else
      false
    end

    if old_rails
      require 'rack'
      require 'unicorn/app/old_rails'
      Unicorn::App::OldRails.new
    else
      ActionController::Dispatcher.new
    end
  when /\.ru$/
    raw = File.open(config, "rb") { |fp| fp.sysread(fp.stat.size) }
    eval("Rack::Builder.new {(#{raw}\n)}.to_app", nil, config)
  else
    require config
    Object.const_get(File.basename(config, '.rb').capitalize)
  end

  map_path ||= '/'
  Rack::Builder.new do
    if inner_app.class.to_s == "Unicorn::App::OldRails"
      if map_path != '/'
        # patches + tests welcome, but I really cbf to deal with this
        # since all apps I've ever dealt with just use "/" ...
        $stderr.puts "relative URL roots may not work for older Rails"
      end
      $stderr.puts "LogTailer not available for Rails < 2.3" unless daemonize
      $stderr.puts "Debugger not available" if $DEBUG
      map(map_path) do
        require 'unicorn/app/old_rails/static'
        use Unicorn::App::OldRails::Static
        run inner_app
      end
    else
      use Rails::Rack::LogTailer unless daemonize
      use Rails::Rack::Debugger if $DEBUG
      map(map_path) do
        use Rails::Rack::Static
        run inner_app
      end
    end
  end.to_app
end

listeners << "#{host}:#{port}" if set_listener

if $DEBUG
  pp({
    :unicorn_options => options,
    :app => app,
    :daemonize => daemonize,
  })
end

# ensure Rails standard tmp paths exist
%w(cache pids sessions sockets).each do |dir|
  FileUtils.mkdir_p("tmp/#{dir}")
end

if daemonize
  options[:pid] = rails_pid
  Unicorn::Launcher.daemonize!
end
Unicorn.run(app, options)