{config, pkgs, serverInfo}:

let

  inherit (pkgs.lib) mkOption;
  inherit (config) urlPrefix distDir;

  dataDir = "/data/pt-wiki/data";
  pubDir = "/data/pt-wiki/pub";

  scriptUrlPath = "/bin";
  pubUrlPath    = "/pub";
  absHostPath   = "/";

  # Hacks for proxying and rewriting
  dispPubUrlPath    = "/pub";
  dispScriptUrlPath = "";
  dispViewPath      = "";

  twikiName = "Program Transformation Wiki";
  startWeb = config.startWeb;
  registrationDomain = "ewi.tudelft.nl";
  defaultUrlHost = "";

  # Build the TWiki CGI and configuration files.
  twikiRoot = (import /etc/nixos/services/twiki/twiki-instance.nix).twiki {
    name = "pt-wiki";
    pubdir = pubDir;
    datadir = dataDir;
    inherit twikiName scriptUrlPath pubUrlPath absHostPath
      dispPubUrlPath dispScriptUrlPath dispViewPath
      registrationDomain defaultUrlHost;
  };

  plugins = import /etc/nixos/services/twiki/server-pkgs/twiki-plugins.nix;

in {

  extraConfig = ''

    ScriptAlias ${scriptUrlPath} "${twikiRoot}/bin"
    Alias ${pubUrlPath} "${pubDir}"

    <Directory "${twikiRoot}/bin">
       Options +ExecCGI
       SetHandler cgi-script
       AllowOverride All
       Allow from all
    </Directory>
    <Directory "${twikiRoot}/templates">
       deny from all
    </Directory>
    <Directory "${twikiRoot}/lib">
       deny from all
    </Directory>
    <Directory "${pubDir}">
       Options None
       AllowOverride None
       Allow from all
       # Hardening suggested by http://twiki.org/cgi-bin/view/Codev/SecurityAlertSecureFileUploads.
       php_admin_flag engine off
       AddType text/plain .html .htm .shtml .php .php3 .phtml .phtm .pl .py .cgi
    </Directory>
    <Directory "${dataDir}">
       deny from all
    </Directory>

    Alias ${absHostPath} ${twikiRoot}/rewritestub/

    <Directory "${twikiRoot}/rewritestub">
      RewriteEngine On
      RewriteBase ${absHostPath}

      # complete bin path
      RewriteRule ^bin(.*)  bin/$1 [L]

      #@customRewriteRules@

      # Hack for restricted webs.
      RewriteRule ^pt/(.*)  $1

      # action / web / whatever
      RewriteRule ^([a-z]+)/([A-Z][^/]+)/(.*)  bin/$1/$2/$3 [L]

      # web / topic
      RewriteRule ^([A-Z][^/]+)/([^/]+)   bin/view/$1/$2 [L]

      # web
      RewriteRule ^([A-Z][^/]+)           bin/view/$1/WebHome [L]

      # web/
      RewriteRule ^([A-Z][^/]+)/          bin/view/$1/WebHome [L]

      RewriteRule ^index.html$            bin/view/${startWeb} [L]

      RewriteRule ^$                      bin/view/${startWeb} [L]
    </Directory>

  '';

  # !!! should not be needed
  extraModulesPre = [];
  extraModules = [];
  robotsEntries = "";
  globalEnvVars = [];
  extraServerPath = [];
  extraPath = [];
  startupScript = null;

  options = {
  };  

}