Esempio n. 1
0
// serveFile delivers an HTML fragment of a Go source file with
// highlighted comments and an (optional) highlighted selection.
// The request parameters are:
//
//   path: "/path/to/file.go"
//   s: optional selection range like "line.col-line.col", e.g. "24.4-25.10"
//
// Returns a "403 Forbidden" status code if the requested file
// is not within the import scope, or a "404 Not Found" if the
// file can't be read.
func serveFile(w http.ResponseWriter, req *http.Request) {
	path := req.FormValue("path")
	if isForbidden(path) {
		errorForbidden(w)
		return
	}
	content, err := ioutil.ReadFile(path)
	if err != nil {
		log.Println(req.RemoteAddr, err)
		http.NotFound(w, req)
		return
	}

	var sel godoc.Selection
	s, err := parseSelection(req.FormValue("s"))
	if err == nil {
		offsets := s.byteOffsetsIn(content)
		sel = godoc.RangeSelection(offsets)
	}

	var buf bytes.Buffer
	godoc.FormatText(&buf, content, -1, true, "", sel)

	buf.WriteTo(w)
}
Esempio n. 2
0
func main() {
	flag.Usage = usage
	flag.Parse()

	// Check usage: either server and no args, command line and args, or index creation mode
	if (*httpAddr != "" || *urlFlag != "") != (flag.NArg() == 0) && !*writeIndex {
		usage()
	}

	// Determine file system to use.
	if *zipfile == "" {
		// use file system of underlying OS
		fs.Bind("/", vfs.OS(*goroot), "/", vfs.BindReplace)
		if *templateDir != "" {
			fs.Bind("/lib/godoc", vfs.OS(*templateDir), "/", vfs.BindBefore)
		} else {
			fs.Bind("/lib/godoc", mapfs.New(static.Files), "/", vfs.BindReplace)
		}
	} else {
		// use file system specified via .zip file (path separator must be '/')
		rc, err := zip.OpenReader(*zipfile)
		if err != nil {
			log.Fatalf("%s: %s\n", *zipfile, err)
		}
		defer rc.Close() // be nice (e.g., -writeIndex mode)
		fs.Bind("/", zipfs.New(rc, *zipfile), *goroot, vfs.BindReplace)
	}

	// Bind $GOPATH trees into Go root.
	for _, p := range filepath.SplitList(build.Default.GOPATH) {
		fs.Bind("/src/pkg", vfs.OS(p), "/src", vfs.BindAfter)
	}

	httpMode := *httpAddr != ""

	corpus := godoc.NewCorpus(fs)
	corpus.Verbose = *verbose
	corpus.IndexEnabled = *indexEnabled && httpMode
	corpus.IndexFiles = *indexFiles
	corpus.IndexThrottle = *indexThrottle
	if *writeIndex {
		corpus.IndexThrottle = 1.0
	}
	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
	if *notesRx != "" {
		pres.NotesRx = regexp.MustCompile(*notesRx)
	}

	readTemplates(pres, httpMode || *urlFlag != "" || *html)
	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.Write(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")
			}
			fs.Fprint(os.Stderr)
			handler = loggingHandler(handler)
		}

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

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

		return
	}

	packageText := pres.PackageText

	// Command line mode.
	if *html {
		packageText = pres.PackageHTML
	}

	if *query {
		handleRemoteSearch()
		return
	}

	// Determine paths.
	//
	// If we are passed an operating system path like . or ./foo or /foo/bar or c:\mysrc,
	// we need to map that path somewhere in the fs name space so that routines
	// like getPageInfo will see it.  We use the arbitrarily-chosen virtual path "/target"
	// for this.  That is, if we get passed a directory like the above, we map that
	// directory so that getPageInfo sees it as /target.
	const target = "/target"
	const cmdPrefix = "cmd/"
	path := flag.Arg(0)
	var forceCmd bool
	var abspath, relpath string
	if filepath.IsAbs(path) {
		fs.Bind(target, vfs.OS(path), "/", vfs.BindReplace)
		abspath = target
	} else if build.IsLocalImport(path) {
		cwd, _ := os.Getwd() // ignore errors
		path = filepath.Join(cwd, path)
		fs.Bind(target, vfs.OS(path), "/", vfs.BindReplace)
		abspath = target
	} else if strings.HasPrefix(path, cmdPrefix) {
		path = strings.TrimPrefix(path, cmdPrefix)
		forceCmd = true
	} else if bp, _ := build.Import(path, "", build.FindOnly); bp.Dir != "" && bp.ImportPath != "" {
		fs.Bind(target, vfs.OS(bp.Dir), "/", vfs.BindReplace)
		abspath = target
		relpath = bp.ImportPath
	} else {
		abspath = pathpkg.Join(pres.PkgFSRoot(), path)
	}
	if relpath == "" {
		relpath = abspath
	}

	var mode godoc.PageInfoMode
	if relpath == "builtin" {
		// the fake built-in package contains unexported identifiers
		mode = godoc.NoFiltering | godoc.NoFactoryFuncs
	}
	if *srcMode {
		// only filter exports if we don't have explicit command-line filter arguments
		if flag.NArg() > 1 {
			mode |= godoc.NoFiltering
		}
		mode |= godoc.ShowSource
	}

	// first, try as package unless forced as command
	var info *godoc.PageInfo
	if !forceCmd {
		info = pres.GetPkgPageInfo(abspath, relpath, mode)
	}

	// second, try as command unless the path is absolute
	// (the go command invokes godoc w/ absolute paths; don't override)
	var cinfo *godoc.PageInfo
	if !filepath.IsAbs(path) {
		abspath = pathpkg.Join(pres.CmdFSRoot(), path)
		cinfo = pres.GetCmdPageInfo(abspath, relpath, mode)
	}

	// determine what to use
	if info == nil || info.IsEmpty() {
		if cinfo != nil && !cinfo.IsEmpty() {
			// only cinfo exists - switch to cinfo
			info = cinfo
		}
	} else if cinfo != nil && !cinfo.IsEmpty() {
		// both info and cinfo exist - use cinfo if info
		// contains only subdirectory information
		if info.PAst == nil && info.PDoc == nil {
			info = cinfo
		} else {
			fmt.Printf("use 'godoc %s%s' for documentation on the %s command \n\n", cmdPrefix, relpath, relpath)
		}
	}

	if info == nil {
		log.Fatalf("%s: no such directory or package", flag.Arg(0))
	}
	if info.Err != nil {
		log.Fatalf("%v", info.Err)
	}

	if info.PDoc != nil && info.PDoc.ImportPath == target {
		// Replace virtual /target with actual argument from command line.
		info.PDoc.ImportPath = flag.Arg(0)
	}

	// If we have more than one argument, use the remaining arguments for filtering.
	if flag.NArg() > 1 {
		args := flag.Args()[1:]
		rx := makeRx(args)
		if rx == nil {
			log.Fatalf("illegal regular expression from %v", args)
		}

		filter := func(s string) bool { return rx.MatchString(s) }
		switch {
		case info.PAst != nil:
			cmap := ast.NewCommentMap(info.FSet, info.PAst, info.PAst.Comments)
			ast.FilterFile(info.PAst, filter)
			// Special case: Don't use templates for printing
			// so we only get the filtered declarations without
			// package clause or extra whitespace.
			for i, d := range info.PAst.Decls {
				// determine the comments associated with d only
				comments := cmap.Filter(d).Comments()
				cn := &printer.CommentedNode{Node: d, Comments: comments}
				if i > 0 {
					fmt.Println()
				}
				if *html {
					var buf bytes.Buffer
					pres.WriteNode(&buf, info.FSet, cn)
					godoc.FormatText(os.Stdout, buf.Bytes(), -1, true, "", nil)
				} else {
					pres.WriteNode(os.Stdout, info.FSet, cn)
				}
				fmt.Println()
			}
			return

		case info.PDoc != nil:
			info.PDoc.Filter(filter)
		}
	}

	if err := packageText.Execute(os.Stdout, info); err != nil {
		log.Printf("packageText.Execute: %s", err)
	}
}