require 'formula'

class Lighttpd < Formula
  homepage 'http://www.lighttpd.net/'
  url 'http://download.lighttpd.net/lighttpd/releases-1.4.x/lighttpd-1.4.32.tar.bz2'
  sha256 '60691b2dcf3ad2472c06b23d75eb0c164bf48a08a630ed3f308f61319104701f'

  option 'with-lua', 'Include Lua scripting support for mod_magnet'

  depends_on 'pkg-config' => :build
  depends_on 'pcre'
  depends_on 'lua' => :optional
  depends_on 'libev' => :optional

  # default max. file descriptors; this option will be ignored if the server is not started as root
  MAX_FDS = 512

  def config_path; etc+"lighttpd/"; end
  def log_path; var+"log/lighttpd/"; end
  def www_path; var+"www/"; end
  def run_path; var+"lighttpd/"; end

  def install
    args = %W[
      --disable-dependency-tracking
      --prefix=#{prefix}
      --with-openssl
      --with-ldap
      --with-zlib
      --with-bzip2
      --with-attr
    ]

    args << "--with-lua" if build.with? 'lua'
    args << "--with-libev" if build.with? 'libev'

    system "./configure", *args
    system "make install"

    mv sbin, bin

    unless File.exists? config_path
      config_path.install Dir["doc/config/lighttpd.conf"]
      config_path.install Dir["doc/config/modules.conf"]
      (config_path/"conf.d/").install Dir["doc/config/conf.d/*.conf"]
      inreplace config_path+"lighttpd.conf" do |s|
        s.sub!(/^var\.log_root\s*=\s*".+"$/,"var.log_root    = \"#{log_path}\"")
        s.sub!(/^var\.server_root\s*=\s*".+"$/,"var.server_root = \"#{www_path}\"")
        s.sub!(/^var\.state_dir\s*=\s*".+"$/,"var.state_dir   = \"#{run_path}\"")
        s.sub!(/^var\.home_dir\s*=\s*".+"$/,"var.home_dir    = \"#{run_path}\"")
        s.sub!(/^var\.conf_dir\s*=\s*".+"$/,"var.conf_dir    = \"#{config_path}\"")
        s.sub!(/^server\.port\s*=\s*80$/,'server.port = 8080')
        s.sub!(/^server\.document-root\s*=\s*server_root + "\/htdocs"$/,'server.document-root = server_root')

        # get rid of "warning: please use server.use-ipv6 only for hostnames, not
        # without server.bind / empty address; your config will break if the kernel
        # default for IPV6_V6ONLY changes" warning
        s.sub!(/^server.use-ipv6\s*=\s*"enable"$/,'server.use-ipv6 = "disable"')

        s.sub!(/^server\.username\s*=\s*".+"$/,'server.username  = "_www"')
        s.sub!(/^server\.groupname\s*=\s*".+"$/,'server.groupname = "_www"')
        s.sub!(/^server\.event-handler\s*=\s*"linux-sysepoll"$/,'server.event-handler = "select"')
        s.sub!(/^server\.network-backend\s*=\s*"linux-sendfile"$/,'server.network-backend = "writev"')

        # "max-connections == max-fds/2",
        # http://redmine.lighttpd.net/projects/1/wiki/Server_max-connectionsDetails
        s.sub!(/^server\.max-connections = .+$/,'server.max-connections = ' + (MAX_FDS / 2).to_s())
      end
    end
  end

  def post_install
    log_path.mkpath
    www_path.mkpath
    (www_path/'htdocs').mkpath
    run_path.mkpath
  end

  test do
    system "#{bin}/lighttpd", '-t', '-f', "#{config_path}lighttpd.conf"
  end

  def caveats; <<-EOS.undent
    Docroot is: #{www_path}

    The default port has been set in #{config_path}lighttpd.conf to 8080 so that
    lighttpd can run without sudo.
    EOS
  end

  plist_options :manual => "lighttpd -f #{HOMEBREW_PREFIX}/etc/lighttpd/lighttpd.conf"

  def plist; <<-EOS.undent
    <?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_prefix}/bin/lighttpd</string>
        <string>-D</string>
        <string>-f</string>
        <string>#{config_path}lighttpd.conf</string>
      </array>
      <key>RunAtLoad</key>
      <true/>
      <key>KeepAlive</key>
      <false/>
      <key>WorkingDirectory</key>
      <string>#{HOMEBREW_PREFIX}</string>
      <key>StandardErrorPath</key>
      <string>#{log_path}/output.log</string>
      <key>StandardOutPath</key>
      <string>#{log_path}/output.log</string>
      <key>HardResourceLimits</key>
      <dict>
        <key>NumberOfFiles</key>
        <integer>#{MAX_FDS}</integer>
      </dict>
      <key>SoftResourceLimits</key>
      <dict>
        <key>NumberOfFiles</key>
        <integer>#{MAX_FDS}</integer>
      </dict>
    </dict>
    </plist>
    EOS
  end
end