func init() {
	playEnabled = true

	log.Println("initializing godoc ...")
	log.Printf(".zip file   = %s", zipFilename)
	log.Printf(".zip GOROOT = %s", zipGoroot)
	log.Printf("index files = %s", indexFilenames)

	// Determine file system to use.
	local.Init(zipGoroot, zipFilename, "", "")
	fs.Bind("/", local.RootFS(), "/", vfs.BindReplace)
	fs.Bind("/lib/godoc", local.StaticFS(*lang), "/", vfs.BindReplace)
	fs.Bind("/doc", local.DocumentFS(*lang), "/", vfs.BindReplace)

	corpus := godoc.NewCorpus(fs)
	corpus.Verbose = false
	corpus.MaxResults = 10000 // matches flag default in main.go
	corpus.IndexEnabled = true
	corpus.IndexFiles = indexFilenames

	// translate hook
	corpus.SummarizePackage = func(importPath string) (summary string, showList, ok bool) {
		if pkg := local.Package(*lang, importPath); pkg != nil {
			summary = doc.Synopsis(pkg.Doc)
		}
		ok = (summary != "")
		return
	}
	corpus.TranslateDocPackage = func(pkg *doc.Package) *doc.Package {
		return local.Package(*lang, pkg.ImportPath, pkg)
	}

	if err := corpus.Init(); err != nil {
		log.Fatal(err)
	}
	if corpus.IndexEnabled && corpus.IndexFiles != "" {
		go corpus.RunIndexer()
	}

	pres = godoc.NewPresentation(corpus)
	pres.TabWidth = 8
	pres.ShowPlayground = true
	pres.ShowExamples = true
	pres.DeclLinks = true
	pres.NotesRx = regexp.MustCompile("BUG")

	readTemplates(pres, true)
	registerHandlers(pres)

	log.Println("godoc initialization complete")
}
func runGodoc() {
	// Determine file system to use.
	local.Init(*goroot, *zipfile, *templateDir, build.Default.GOPATH)
	fs.Bind("/", local.RootFS(), "/", vfs.BindReplace)
	fs.Bind("/lib/godoc", local.StaticFS(*lang), "/", vfs.BindReplace)
	fs.Bind("/doc", local.DocumentFS(*lang), "/", vfs.BindReplace)

	httpMode := *httpAddr != ""

	var typeAnalysis, pointerAnalysis bool
	if *analysisFlag != "" {
		for _, a := range strings.Split(*analysisFlag, ",") {
			switch a {
			case "type":
				typeAnalysis = true
			case "pointer":
				pointerAnalysis = true
			default:
				log.Fatalf("unknown analysis: %s", a)
			}
		}
	}

	corpus := godoc.NewCorpus(fs)

	// translate hook
	corpus.SummarizePackage = func(importPath string) (summary string, showList, ok bool) {
		if pkg := local.Package(*lang, importPath); pkg != nil {
			summary = doc.Synopsis(pkg.Doc)
		}
		ok = (summary != "")
		return
	}
	corpus.TranslateDocPackage = func(pkg *doc.Package) *doc.Package {
		return local.Package(*lang, pkg.ImportPath, pkg)
	}

	corpus.Verbose = *verbose
	corpus.MaxResults = *maxResults
	corpus.IndexEnabled = *indexEnabled && httpMode
	if *maxResults == 0 {
		corpus.IndexFullText = false
	}
	corpus.IndexFiles = *indexFiles
	corpus.IndexThrottle = *indexThrottle
	if *writeIndex {
		corpus.IndexThrottle = 1.0
		corpus.IndexEnabled = true
	}
	if *writeIndex || httpMode || *urlFlag != "" {
		if err := corpus.Init(); err != nil {
			log.Fatal(err)
		}
	}

	pres = godoc.NewPresentation(corpus)
	pres.TabWidth = *tabWidth
	pres.ShowTimestamps = *showTimestamps
	pres.ShowPlayground = *showPlayground
	pres.ShowExamples = *showExamples
	pres.DeclLinks = *declLinks
	pres.SrcMode = *srcMode
	pres.HTMLMode = *html
	if *notesRx != "" {
		pres.NotesRx = regexp.MustCompile(*notesRx)
	}

	readTemplates(pres, httpMode || *urlFlag != "")
	registerHandlers(pres)

	if *writeIndex {
		// Write search index and exit.
		if *indexFiles == "" {
			log.Fatal("no index file specified")
		}

		log.Println("initialize file systems")
		*verbose = true // want to see what happens

		corpus.UpdateIndex()

		log.Println("writing index file", *indexFiles)
		f, err := os.Create(*indexFiles)
		if err != nil {
			log.Fatal(err)
		}
		index, _ := corpus.CurrentIndex()
		_, err = index.WriteTo(f)
		if err != nil {
			log.Fatal(err)
		}

		log.Println("done")
		return
	}

	// Print content that would be served at the URL *urlFlag.
	if *urlFlag != "" {
		handleURLFlag()
		return
	}

	if httpMode {
		// HTTP server mode.
		var handler http.Handler = http.DefaultServeMux
		if *verbose {
			log.Printf("Go Documentation Server")
			log.Printf("version = %s", runtime.Version())
			log.Printf("address = %s", *httpAddr)
			log.Printf("goroot = %s", *goroot)
			log.Printf("tabwidth = %d", *tabWidth)
			switch {
			case !*indexEnabled:
				log.Print("search index disabled")
			case *maxResults > 0:
				log.Printf("full text index enabled (maxresults = %d)", *maxResults)
			default:
				log.Print("identifier search index enabled")
			}
			handler = loggingHandler(handler)
		}

		// Initialize search index.
		if *indexEnabled {
			go corpus.RunIndexer()
		}

		// Start type/pointer analysis.
		if typeAnalysis || pointerAnalysis {
			go analysis.Run(pointerAnalysis, &corpus.Analysis)
		}

		// Start http server.
		if err := http.ListenAndServe(*httpAddr, handler); err != nil {
			log.Fatalf("ListenAndServe %s: %v", *httpAddr, err)
		}

		return
	}

	if *query {
		handleRemoteSearch()
		return
	}

	if err := godoc.CommandLine(os.Stdout, fs, pres, flag.Args()); err != nil {
		log.Print(err)
	}
}