From 562e4faeca3a05090422a0cf8e43d8608129d53e Mon Sep 17 00:00:00 2001 From: Andrew Gerrand Date: Fri, 16 Aug 2013 11:44:27 +1000 Subject: [PATCH] cmd/godoc: bake templates and scripts into godoc binary Add godoc/vfs/mapfs package for serving baked files. Fixes golang/go#6010. R=golang-dev, bradfitz, r, arnehormann, rsc CC=golang-dev https://golang.org/cl/12978043 --- cmd/godoc/bake.go | 64 ++ cmd/godoc/bake.sh | 9 + cmd/godoc/main.go | 9 +- cmd/godoc/template.go | 1961 ++++++++++++++++++++++++++++++++++++++ godoc/vfs/mapfs/mapfs.go | 81 ++ 5 files changed, 2117 insertions(+), 7 deletions(-) create mode 100644 cmd/godoc/bake.go create mode 100755 cmd/godoc/bake.sh create mode 100644 cmd/godoc/template.go create mode 100644 godoc/vfs/mapfs/mapfs.go diff --git a/cmd/godoc/bake.go b/cmd/godoc/bake.go new file mode 100644 index 000000000..cabd2f9c8 --- /dev/null +++ b/cmd/godoc/bake.go @@ -0,0 +1,64 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build ignore + +// Command bake takes a list of file names and writes a Go source file to +// standard output that declares a map of string constants containing the input files. +// +// For example, the command +// bake foo.html bar.txt +// produces a source file in package main that declares the variable bakedFiles +// that is a map with keys "foo.html" and "bar.txt" that contain the contents +// of foo.html and bar.txt. +package main + +import ( + "bufio" + "bytes" + "fmt" + "io/ioutil" + "os" + "path/filepath" + "unicode/utf8" +) + +func main() { + if err := bake(os.Args[1:]); err != nil { + fmt.Fprintln(os.Stderr, err) + os.Exit(1) + } +} + +func bake(files []string) error { + w := bufio.NewWriter(os.Stdout) + fmt.Fprintf(w, "%v\n\npackage main\n\n", warning) + fmt.Fprintf(w, "var bakedFiles = map[string]string{\n") + for _, fn := range files { + b, err := ioutil.ReadFile(fn) + if err != nil { + return err + } + if !utf8.Valid(b) { + return fmt.Errorf("file %s is not valid UTF-8", fn) + } + fmt.Fprintf(w, "\t%q: `%s`,\n", filepath.Base(fn), sanitize(b)) + } + fmt.Fprintln(w, "}") + return w.Flush() +} + +// sanitize prepares a string as a raw string constant. +func sanitize(b []byte) []byte { + // Replace ` with `+"`"+` + b = bytes.Replace(b, []byte("`"), []byte("`+\"`\"+`"), -1) + + // Replace BOM with `+"\xEF\xBB\xBF"+` + // (A BOM is valid UTF-8 but not permitted in Go source files. + // I wouldn't bother handling this, but for some insane reason + // jquery.js has a BOM somewhere in the middle.) + return bytes.Replace(b, []byte("\xEF\xBB\xBF"), []byte("`+\"\\xEF\\xBB\\xBF\"+`"), -1) +} + +const warning = "// DO NOT EDIT ** This file was generated with the bake tool ** DO NOT EDIT //" diff --git a/cmd/godoc/bake.sh b/cmd/godoc/bake.sh new file mode 100755 index 000000000..0b73a0a4d --- /dev/null +++ b/cmd/godoc/bake.sh @@ -0,0 +1,9 @@ +#!/usr/bin/env bash +# Copyright 2013 The Go Authors. All rights reserved. +# Use of this source code is governed by a BSD-style +# license that can be found in the LICENSE file. + +set -e + +go run bake.go template/* | gofmt > template.go + diff --git a/cmd/godoc/main.go b/cmd/godoc/main.go index 1593bbd62..51124bfd4 100644 --- a/cmd/godoc/main.go +++ b/cmd/godoc/main.go @@ -50,6 +50,7 @@ import ( "code.google.com/p/go.tools/godoc" "code.google.com/p/go.tools/godoc/vfs" + "code.google.com/p/go.tools/godoc/vfs/mapfs" "code.google.com/p/go.tools/godoc/vfs/zipfs" ) @@ -196,13 +197,7 @@ func main() { if *templateDir != "" { fs.Bind("/lib/godoc", vfs.OS(*templateDir), "/", vfs.BindBefore) } else { - // Read templates from go.tools repository; if not - // found there, fall back on $GOROOT/lib/godoc - // which will be present in binary distributions. - pkg, err := build.Import(templatePath, "", build.FindOnly) - if err == nil { - fs.Bind("/lib/godoc", vfs.OS(pkg.Dir), "/", vfs.BindReplace) - } + fs.Bind("/lib/godoc", mapfs.New(bakedFiles), "/", vfs.BindReplace) } } else { // use file system specified via .zip file (path separator must be '/') diff --git a/cmd/godoc/template.go b/cmd/godoc/template.go new file mode 100644 index 000000000..60920d830 --- /dev/null +++ b/cmd/godoc/template.go @@ -0,0 +1,1961 @@ +// DO NOT EDIT ** This file was generated with the bake tool ** DO NOT EDIT // + +package main + +var bakedFiles = map[string]string{ + "codewalk.html": ` + + + + +
+
+
+
+
+ + Pop Out Code + + +
+
+ +
+
+
+ code on left • right + code width 70% + filepaths shown • hidden +
+
+
+
+ {{range .Step}} +
+ +
{{html .Title}}
+
+ {{with .Err}} + ERROR LOADING FILE: {{html .}}

+ {{end}} + {{.XML}} +
+
{{html .}}
+
+ {{end}} +
+
+ previous step + • + next step +
+
+
+`, + "codewalkdir.html": ` + + +{{range .}} + + {{$name_html := html .Name}} + + + + +{{end}} +
{{$name_html}} {{html .Title}}
+`, + "dirlist.html": ` + +

+ + + + + + + + + + + +{{range .}} + + {{$name_html := fileInfoName . | html}} + + + + + + +{{end}} + +
File Bytes Modified
..
{{$name_html}}{{html .Size}}{{fileInfoTime . | html}}
+

+`, + "error.html": ` + +

+{{html .}} +

+`, + "example.html": `
+ +
+

▾ Example{{example_suffix .Name}}

+ {{with .Doc}}

{{html .}}

{{end}} + {{$output := .Output}} + {{with .Play}} +
+
+ 
{{html $output}}
+
+ Run + Format + +
+
+ {{else}} +

Code:

+ 
{{.Code}}
+ {{with .Output}} +

Output:

+ 
{{html .}}
+ {{end}} + {{end}} +
+
+`, + "godoc.html": ` + + + +{{with .Tabtitle}} + {{html .}} - The Go Programming Language +{{else}} + The Go Programming Language +{{end}} + +{{if .SearchBox}} + +{{end}} + + + + +
+ +
+ + +
+ +
+ +{{if .Playground}} +
+
+
+
+ Run + Format + +
+
+{{end}} + +
+
+ +{{with .Title}} +
+

{{html .}}

+{{end}} +{{with .Subtitle}} +

{{html .}}

+{{end}} + +{{/* The Table of Contents is automatically inserted in this
. + Do not delete this
. */}} + + +{{/* Body is HTML-escaped elsewhere */}} +{{printf "%s" .Body}} + + + +
+
+ + +{{if .Playground}} + +{{end}} + + + + + +`, + "godocs.js": `// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* A little code to ease navigation of these documents. + * + * On window load we: + * + Bind search box hint placeholder show/hide events (bindSearchEvents) + * + Generate a table of contents (generateTOC) + * + Bind foldable sections (bindToggles) + * + Bind links to foldable sections (bindToggleLinks) + */ + +(function() { +'use strict'; + +function bindSearchEvents() { + + var search = $('#search'); + if (search.length === 0) { + return; // no search box + } + + function clearInactive() { + if (search.is('.inactive')) { + search.val(''); + search.removeClass('inactive'); + } + } + + function restoreInactive() { + if (search.val() !== '') { + return; + } + search.val(search.attr('placeholder')); + search.addClass('inactive'); + } + + search.on('focus', clearInactive); + search.on('blur', restoreInactive); + + restoreInactive(); +} + +/* Generates a table of contents: looks for h2 and h3 elements and generates + * links. "Decorates" the element with id=="nav" with this table of contents. + */ +function generateTOC() { + if ($('#manual-nav').length > 0) { + return; + } + + var nav = $('#nav'); + if (nav.length === 0) { + return; + } + + var toc_items = []; + $(nav).nextAll('h2, h3').each(function() { + var node = this; + if (node.id == '') + node.id = 'tmp_' + toc_items.length; + var link = $('').attr('href', '#' + node.id).text($(node).text()); + var item; + if ($(node).is('h2')) { + item = $('
'); + } else { // h3 + item = $('
'); + } + item.append(link); + toc_items.push(item); + }); + if (toc_items.length <= 1) { + return; + } + + var dl1 = $('
'); + var dl2 = $('
'); + + var split_index = (toc_items.length / 2) + 1; + if (split_index < 8) { + split_index = toc_items.length; + } + for (var i = 0; i < split_index; i++) { + dl1.append(toc_items[i]); + } + for (/* keep using i */; i < toc_items.length; i++) { + dl2.append(toc_items[i]); + } + + var tocTable = $('').appendTo(nav); + var tocBody = $('').appendTo(tocTable); + var tocRow = $('').appendTo(tocBody); + + // 1st column + $(']","i"),bv=/^(?:checkbox|radio)$/,bw=/checked\s*(?:[^=]|=\s*.checked.)/i,bx=/\/(java|ecma)script/i,by=/^\s*\s*$/g,bz={option:[1,""],legend:[1,"
","
"],thead:[1,"
').appendTo(tocRow).append(dl1); + // 2nd column + $('').appendTo(tocRow).append(dl2); +} + +function bindToggle(el) { + $('.toggleButton', el).click(function() { + if ($(el).is('.toggle')) { + $(el).addClass('toggleVisible').removeClass('toggle'); + } else { + $(el).addClass('toggle').removeClass('toggleVisible'); + } + }); +} +function bindToggles(selector) { + $(selector).each(function(i, el) { + bindToggle(el); + }); +} + +function bindToggleLink(el, prefix) { + $(el).click(function() { + var href = $(el).attr('href'); + var i = href.indexOf('#'+prefix); + if (i < 0) { + return; + } + var id = '#' + prefix + href.slice(i+1+prefix.length); + if ($(id).is('.toggle')) { + $(id).find('.toggleButton').first().click(); + } + }); +} +function bindToggleLinks(selector, prefix) { + $(selector).each(function(i, el) { + bindToggleLink(el, prefix); + }); +} + +function setupDropdownPlayground() { + if (!$('#page').is('.wide')) { + return; // don't show on front page + } + var button = $('#playgroundButton'); + var div = $('#playground'); + var setup = false; + button.toggle(function() { + button.addClass('active'); + div.show(); + if (setup) { + return; + } + setup = true; + playground({ + 'codeEl': $('.code', div), + 'outputEl': $('.output', div), + 'runEl': $('.run', div), + 'fmtEl': $('.fmt', div), + 'shareEl': $('.share', div), + 'shareRedirect': 'http://play.golang.org/p/' + }); + }, + function() { + button.removeClass('active'); + div.hide(); + }); + button.show(); + $('#menu').css('min-width', '+=60'); +} + +function setupInlinePlayground() { + 'use strict'; + // Set up playground when each element is toggled. + $('div.play').each(function (i, el) { + // Set up playground for this example. + var setup = function() { + var code = $('.code', el); + playground({ + 'codeEl': code, + 'outputEl': $('.output', el), + 'runEl': $('.run', el), + 'fmtEl': $('.fmt', el), + 'shareEl': $('.share', el), + 'shareRedirect': 'http://play.golang.org/p/' + }); + + // Make the code textarea resize to fit content. + var resize = function() { + code.height(0); + var h = code[0].scrollHeight; + code.height(h+20); // minimize bouncing. + code.closest('.input').height(h); + }; + code.on('keydown', resize); + code.on('keyup', resize); + code.keyup(); // resize now. + }; + + // If example already visible, set up playground now. + if ($(el).is(':visible')) { + setup(); + return; + } + + // Otherwise, set up playground when example is expanded. + var built = false; + $(el).closest('.toggle').click(function() { + // Only set up once. + if (!built) { + setup(); + built = true; + } + }); + }); +} + +// fixFocus tries to put focus to div#page so that keyboard navigation works. +function fixFocus() { + var page = $('div#page'); + var topbar = $('div#topbar'); + page.css('outline', 0); // disable outline when focused + page.attr('tabindex', -1); // and set tabindex so that it is focusable + $(window).resize(function (evt) { + // only focus page when the topbar is at fixed position (that is, it's in + // front of page, and keyboard event will go to the former by default.) + // by focusing page, keyboard event will go to page so that up/down arrow, + // space, etc. will work as expected. + if (topbar.css('position') == "fixed") + page.focus(); + }).resize(); +} + +function toggleHash() { + var hash = $(window.location.hash); + if (hash.is('.toggle')) { + hash.find('.toggleButton').first().click(); + } +} + +function addPlusButtons() { + var po = document.createElement('script'); + po.type = 'text/javascript'; + po.async = true; + po.src = 'https://apis.google.com/js/plusone.js'; + var s = document.getElementsByTagName('script')[0]; + s.parentNode.insertBefore(po, s); +} + +$(document).ready(function() { + bindSearchEvents(); + generateTOC(); + bindToggles(".toggle"); + bindToggles(".toggleVisible"); + bindToggleLinks(".exampleLink", "example_"); + bindToggleLinks(".overviewLink", ""); + bindToggleLinks(".examplesLink", ""); + bindToggleLinks(".indexLink", ""); + setupDropdownPlayground(); + setupInlinePlayground(); + fixFocus(); + toggleHash(); + addPlusButtons(); + + // godoc.html defines window.initFuncs in the tag, and root.html and + // codewalk.js push their on-page-ready functions to the list. + // We execute those functions here, to avoid loading jQuery until the page + // content is loaded. + for (var i = 0; i < window.initFuncs.length; i++) window.initFuncs[i](); +}); + +})(); +`, + "jquery.js": `/*! 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p.access(this,function(c,d,e){var f;return p.isWindow(c)?c.document.documentElement["client"+a]:c.nodeType===9?(f=c.documentElement,Math.max(c.body["scroll"+a],f["scroll"+a],c.body["offset"+a],f["offset"+a],f["client"+a])):e===b?p.css(c,d,e,h):p.style(c,d,e,h)},c,g?e:b,g,null)}})}),a.jQuery=a.$=p,typeof define=="function"&&define.amd&&define.amd.jQuery&&define("jquery",[],function(){return p})})(window);`, + "opensearch.xml": ` + + godoc + The Go Programming Language + go golang + + + /favicon.ico + UTF-8 + UTF-8 + +`, + "package.html": ` + +{{with .PDoc}} + {{if $.IsMain}} + {{/* command documentation */}} + {{comment_html .Doc}} + {{else}} + {{/* package documentation */}} +
+
+
import "{{html .ImportPath}}"
+
+
+
Overview
+
Index
+ {{if $.Examples}} +
Examples
+ {{end}} + {{if $.Dirs}} +
Subdirectories
+ {{end}} +
+
+ +
+ +
+

Overview ▾

+ {{comment_html .Doc}} +
+
+ {{example_html $ ""}} + +
+ +
+

Index ▾

+ + +
+
+ {{if .Consts}} +
Constants
+ {{end}} + {{if .Vars}} +
Variables
+ {{end}} + {{range .Funcs}} + {{$name_html := html .Name}} +
{{node_html $ .Decl false}}
+ {{end}} + {{range .Types}} + {{$tname_html := html .Name}} +
type {{$tname_html}}
+ {{range .Funcs}} + {{$name_html := html .Name}} +
    {{node_html $ .Decl false}}
+ {{end}} + {{range .Methods}} + {{$name_html := html .Name}} +
    {{node_html $ .Decl false}}
+ {{end}} + {{end}} + {{if $.Notes}} + {{range $marker, $item := $.Notes}} +
{{noteTitle $marker | html}}s
+ {{end}} + {{end}} +
+
+ + {{if $.Examples}} +
+

Examples

+
+ {{range $.Examples}} +
{{example_name .Name}}
+ {{end}} +
+
+ {{end}} + + {{with .Filenames}} +

Package files

+

+ + {{range .}} + {{.|filename|html}} + {{end}} + +

+ {{end}} +
+
+ + {{with .Consts}} +

Constants

+ {{range .}} + 
{{node_html $ .Decl true}}
+ {{comment_html .Doc}} + {{end}} + {{end}} + {{with .Vars}} +

Variables

+ {{range .}} + 
{{node_html $ .Decl true}}
+ {{comment_html .Doc}} + {{end}} + {{end}} + {{range .Funcs}} + {{/* Name is a string - no need for FSet */}} + {{$name_html := html .Name}} +

func {{$name_html}}

+ 
{{node_html $ .Decl true}}
+ {{comment_html .Doc}} + {{example_html $ .Name}} + {{end}} + {{range .Types}} + {{$tname := .Name}} + {{$tname_html := html .Name}} +

type {{$tname_html}}

+ 
{{node_html $ .Decl true}}
+ {{comment_html .Doc}} + + {{range .Consts}} + 
{{node_html $ .Decl true}}
+ {{comment_html .Doc}} + {{end}} + + {{range .Vars}} + 
{{node_html $ .Decl true}}
+ {{comment_html .Doc}} + {{end}} + + {{example_html $ $tname}} + + {{range .Funcs}} + {{$name_html := html .Name}} +

func {{$name_html}}

+ 
{{node_html $ .Decl true}}
+ {{comment_html .Doc}} + {{example_html $ .Name}} + {{end}} + + {{range .Methods}} + {{$name_html := html .Name}} +

func ({{html .Recv}}) {{$name_html}}

+ 
{{node_html $ .Decl true}}
+ {{comment_html .Doc}} + {{$name := printf "%s_%s" $tname .Name}} + {{example_html $ $name}} + {{end}} + {{end}} + {{end}} + + {{with $.Notes}} + {{range $marker, $content := .}} +

{{noteTitle $marker | html}}s

+
    + {{range .}} +
  • ☞ {{html .Body}}
    • + {{end}} +
+ {{end}} + {{end}} +{{end}} + +{{with .PAst}} + 
{{node_html $ . false}}
+{{end}} + +{{with .Dirs}} + {{/* DirList entries are numbers and strings - no need for FSet */}} + {{if $.PDoc}} +

Subdirectories

+ {{else}} +
+ +
+ {{end}} +
+ + + + + + {{if not $.DirFlat}} + + + + {{end}} + {{range .List}} + {{if $.DirFlat}} + {{if .HasPkg}} + + + + + + {{end}} + {{else}} + + + + + + {{end}} + {{end}} +
Name    Synopsis
..
{{html .Path}}    {{html .Synopsis}}
{{repeat ` + "`" + `     ` + "`" + ` .Depth}}{{html .Name}}    {{html .Synopsis}}
+ {{if $.PDoc}}{{else}} +

Need more packages? Take a look at the Go Projects wiki page.

+ {{end}} +{{end}} +`, + "package.txt": `{{with .PAst}}{{node $ .}}{{end}}{{/* + +--------------------------------------- + +*/}}{{with .PDoc}}{{if $.IsMain}}COMMAND DOCUMENTATION + +{{comment_text .Doc " " "\t"}} +{{else}}PACKAGE DOCUMENTATION + +package {{.Name}} + import "{{.ImportPath}}" + +{{comment_text .Doc " " "\t"}} +{{example_text $ "" " "}}{{/* + +--------------------------------------- + +*/}}{{with .Consts}} +CONSTANTS + +{{range .}}{{node $ .Decl}} +{{comment_text .Doc " " "\t"}} +{{end}}{{end}}{{/* + +--------------------------------------- + +*/}}{{with .Vars}} +VARIABLES + +{{range .}}{{node $ .Decl}} +{{comment_text .Doc " " "\t"}} +{{end}}{{end}}{{/* + +--------------------------------------- + +*/}}{{with .Funcs}} +FUNCTIONS + +{{range .}}{{node $ .Decl}} +{{comment_text .Doc " " "\t"}} +{{example_text $ .Name " "}}{{end}}{{end}}{{/* + +--------------------------------------- + +*/}}{{with .Types}} +TYPES + +{{range .}}{{$tname := .Name}}{{node $ .Decl}} +{{comment_text .Doc " " "\t"}} +{{range .Consts}}{{node $ .Decl}} +{{comment_text .Doc " " "\t"}} +{{end}}{{range .Vars}}{{node $ .Decl}} +{{comment_text .Doc " " "\t"}} +{{end}}{{example_text $ .Name " "}} +{{range .Funcs}}{{node $ .Decl}} +{{comment_text .Doc " " "\t"}} +{{example_text $ .Name " "}} +{{end}}{{range .Methods}}{{node $ .Decl}} +{{comment_text .Doc " " "\t"}} +{{$name := printf "%s_%s" $tname .Name}}{{example_text $ $name " "}}{{end}} +{{end}}{{end}}{{end}}{{/* + +--------------------------------------- + +*/}}{{with $.Notes}} +{{range $marker, $content := .}} +{{$marker}}S + +{{range $content}}{{comment_text .Body " " "\t"}} +{{end}}{{end}}{{end}}{{end}}{{/* + +--------------------------------------- + +*/}}{{with .Dirs}} +SUBDIRECTORIES +{{if $.DirFlat}}{{range .List}}{{if .HasPkg}} + {{.Path}}{{end}}{{end}} +{{else}}{{range .List}} + {{repeat ` + "`" + `. ` + "`" + ` .Depth}}{{.Name}}{{end}} +{{end}}{{end}} +`, + "playground.js": `// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// This is a copy of present/js/playground.js from the repository at +// https://code.google.com/p/go.talks +// Please make changes to that repository. + +/* +In the absence of any formal way to specify interfaces in JavaScript, +here's a skeleton implementation of a playground transport. + + function Transport() { + // Set up any transport state (eg, make a websocket connnection). + return { + Run: function(body, output, options) { + // Compile and run the program 'body' with 'options'. + // Call the 'output' callback to display program output. + return { + Kill: function() { + // Kill the running program. + } + }; + } + }; + } + + // The output callback is called multiple times, and each time it is + // passed an object of this form. + var write = { + Kind: 'string', // 'start', 'stdout', 'stderr', 'end' + Body: 'string' // content of write or end status message + } + + // The first call must be of Kind 'start' with no body. + // Subsequent calls may be of Kind 'stdout' or 'stderr' + // and must have a non-null Body string. + // The final call should be of Kind 'end' with an optional + // Body string, signifying a failure ("killed", for example). + + // The output callback must be of this form. + // See PlaygroundOutput (below) for an implementation. + function outputCallback(write) { + } +*/ + +function HTTPTransport() { + 'use strict'; + + // TODO(adg): support stderr + + function playback(output, events) { + var timeout; + output({Kind: 'start'}); + function next() { + if (events.length === 0) { + output({Kind: 'end'}); + return; + } + var e = events.shift(); + if (e.Delay === 0) { + output({Kind: 'stdout', Body: e.Message}); + next(); + return; + } + timeout = setTimeout(function() { + output({Kind: 'stdout', Body: e.Message}); + next(); + }, e.Delay / 1000000); + } + next(); + return { + Stop: function() { + clearTimeout(timeout); + } + } + } + + function error(output, msg) { + output({Kind: 'start'}); + output({Kind: 'stderr', Body: msg}); + output({Kind: 'end'}); + } + + var seq = 0; + return { + Run: function(body, output, options) { + seq++; + var cur = seq; + var playing; + $.ajax('/compile', { + type: 'POST', + data: {'version': 2, 'body': body}, + dataType: 'json', + success: function(data) { + if (seq != cur) return; + if (!data) return; + if (playing != null) playing.Stop(); + if (data.Errors) { + error(output, data.Errors); + return; + } + playing = playback(output, data.Events); + }, + error: function() { + error(output, 'Error communicating with remote server.'); + } + }); + return { + Kill: function() { + if (playing != null) playing.Stop(); + output({Kind: 'end', Body: 'killed'}); + } + }; + } + }; +} + +function SocketTransport() { + 'use strict'; + + var id = 0; + var outputs = {}; + var started = {}; + var websocket = new WebSocket('ws://' + window.location.host + '/socket'); + + websocket.onclose = function() { + console.log('websocket connection closed'); + } + + websocket.onmessage = function(e) { + var m = JSON.parse(e.data); + var output = outputs[m.Id]; + if (output === null) + return; + if (!started[m.Id]) { + output({Kind: 'start'}); + started[m.Id] = true; + } + output({Kind: m.Kind, Body: m.Body}); + } + + function send(m) { + websocket.send(JSON.stringify(m)); + } + + return { + Run: function(body, output, options) { + var thisID = id+''; + id++; + outputs[thisID] = output; + send({Id: thisID, Kind: 'run', Body: body, Options: options}); + return { + Kill: function() { + send({Id: thisID, Kind: 'kill'}); + } + }; + } + }; +} + +function PlaygroundOutput(el) { + 'use strict'; + + return function(write) { + if (write.Kind == 'start') { + el.innerHTML = ''; + return; + } + + var cl = 'system'; + if (write.Kind == 'stdout' || write.Kind == 'stderr') + cl = write.Kind; + + var m = write.Body; + if (write.Kind == 'end') + m = '\nProgram exited' + (m?(': '+m):'.'); + + if (m.indexOf('IMAGE:') === 0) { + // TODO(adg): buffer all writes before creating image + var url = 'data:image/png;base64,' + m.substr(6); + var img = document.createElement('img'); + img.src = url; + el.appendChild(img); + return; + } + + // ^L clears the screen. + var s = m.split('\x0c'); + if (s.length > 1) { + el.innerHTML = ''; + m = s.pop(); + } + + m = m.replace(/&/g, '&'); + m = m.replace(//g, '>'); + + var needScroll = (el.scrollTop + el.offsetHeight) == el.scrollHeight; + + var span = document.createElement('span'); + span.className = cl; + span.innerHTML = m; + el.appendChild(span); + + if (needScroll) + el.scrollTop = el.scrollHeight - el.offsetHeight; + } +} + +(function() { + function lineHighlight(error) { + var regex = /prog.go:([0-9]+)/g; + var r = regex.exec(error); + while (r) { + $(".lines div").eq(r[1]-1).addClass("lineerror"); + r = regex.exec(error); + } + } + function highlightOutput(wrappedOutput) { + return function(write) { + if (write.Body) lineHighlight(write.Body); + wrappedOutput(write); + } + } + function lineClear() { + $(".lineerror").removeClass("lineerror"); + } + + // opts is an object with these keys + // codeEl - code editor element + // outputEl - program output element + // runEl - run button element + // fmtEl - fmt button element (optional) + // shareEl - share button element (optional) + // shareURLEl - share URL text input element (optional) + // shareRedirect - base URL to redirect to on share (optional) + // toysEl - toys select element (optional) + // enableHistory - enable using HTML5 history API (optional) + // transport - playground transport to use (default is HTTPTransport) + function playground(opts) { + var code = $(opts.codeEl); + var transport = opts['transport'] || new HTTPTransport(); + var running; + + // autoindent helpers. + function insertTabs(n) { + // find the selection start and end + var start = code[0].selectionStart; + var end = code[0].selectionEnd; + // split the textarea content into two, and insert n tabs + var v = code[0].value; + var u = v.substr(0, start); + for (var i=0; i 0) { + curpos--; + if (el.value[curpos] == "\t") { + tabs++; + } else if (tabs > 0 || el.value[curpos] == "\n") { + break; + } + } + setTimeout(function() { + insertTabs(tabs); + }, 1); + } + + function keyHandler(e) { + if (e.keyCode == 9) { // tab + insertTabs(1); + e.preventDefault(); + return false; + } + if (e.keyCode == 13) { // enter + if (e.shiftKey) { // +shift + run(); + e.preventDefault(); + return false; + } else { + autoindent(e.target); + } + } + return true; + } + code.unbind('keydown').bind('keydown', keyHandler); + var outdiv = $(opts.outputEl).empty(); + var output = $('
').appendTo(outdiv);
+  
+    function body() {
+      return $(opts.codeEl).val();
+    }
+    function setBody(text) {
+      $(opts.codeEl).val(text);
+    }
+    function origin(href) {
+      return (""+href).split("/").slice(0, 3).join("/");
+    }
+  
+    var pushedEmpty = (window.location.pathname == "/");
+    function inputChanged() {
+      if (pushedEmpty) {
+        return;
+      }
+      pushedEmpty = true;
+      $(opts.shareURLEl).hide();
+      window.history.pushState(null, "", "/");
+    }
+    function popState(e) {
+      if (e === null) {
+        return;
+      }
+      if (e && e.state && e.state.code) {
+        setBody(e.state.code);
+      }
+    }
+    var rewriteHistory = false;
+    if (window.history && window.history.pushState && window.addEventListener && opts.enableHistory) {
+      rewriteHistory = true;
+      code[0].addEventListener('input', inputChanged);
+      window.addEventListener('popstate', popState);
+    }
+
+    function setError(error) {
+      if (running) running.Kill();
+      lineClear();
+      lineHighlight(error);
+      output.empty().addClass("error").text(error);
+    }
+    function loading() {
+      lineClear();
+      if (running) running.Kill();
+      output.removeClass("error").text('Waiting for remote server...');
+    }
+    function run() {
+      loading();
+      running = transport.Run(body(), highlightOutput(PlaygroundOutput(output[0])));
+    }
+    function fmt() {
+      loading();
+      $.ajax("/fmt", {
+        data: {"body": body()},
+        type: "POST",
+        dataType: "json",
+        success: function(data) {
+          if (data.Error) {
+            setError(data.Error);
+          } else {
+            setBody(data.Body);
+            setError("");
+          }
+        }
+      });
+    }
+
+    $(opts.runEl).click(run);
+    $(opts.fmtEl).click(fmt);
+  
+    if (opts.shareEl !== null && (opts.shareURLEl !== null || opts.shareRedirect !== null)) {
+      var shareURL;
+      if (opts.shareURLEl) {
+        shareURL = $(opts.shareURLEl).hide();
+      }
+      var sharing = false;
+      $(opts.shareEl).click(function() {
+        if (sharing) return;
+        sharing = true;
+        var sharingData = body();
+        $.ajax("/share", {
+          processData: false,
+          data: sharingData,
+          type: "POST",
+          complete: function(xhr) {
+            sharing = false;
+            if (xhr.status != 200) {
+              alert("Server error; try again.");
+              return;
+            }
+            if (opts.shareRedirect) {
+              window.location = opts.shareRedirect + xhr.responseText;
+            }
+            if (shareURL) {
+              var path = "/p/" + xhr.responseText;
+              var url = origin(window.location) + path;
+              shareURL.show().val(url).focus().select();
+  
+              if (rewriteHistory) {
+                var historyData = {"code": sharingData};
+                window.history.pushState(historyData, "", path);
+                pushedEmpty = false;
+              }
+            }
+          }
+        });
+      });
+    }
+  
+    if (opts.toysEl !== null) {
+      $(opts.toysEl).bind('change', function() {
+        var toy = $(this).val();
+        $.ajax("/doc/play/"+toy, {
+          processData: false,
+          type: "GET",
+          complete: function(xhr) {
+            if (xhr.status != 200) {
+              alert("Server error; try again.");
+              return;
+            }
+            setBody(xhr.responseText);
+          }
+        });
+      });
+    }
+  }
+
+  window.playground = playground;
+})();
+`,
+	"search.html": `
+{{$query_url := urlquery .Query}}
+{{with .Alert}}
+	

+	{{html .}}
+	

+{{end}}
+{{with .Alt}}
+	

+	Did you mean: 
+	{{range .Alts}}
+		{{html .}}
+	{{end}}
+	

+{{end}}
+{{with .Pak}}
+	
Package {{html $.Query}}

+	

+	
+	{{range .}}
+		{{$pkg_html := pkgLink .Pak.Path | html}}
+		
+	{{end}}
+	
{{$pkg_html}}

+	

+{{end}}
+{{with .Hit}}
+	{{with .Decls}}
+		
Package-level declarations

+		{{range .}}
+			{{$pkg_html := pkgLink .Pak.Path | html}}
+			
package {{html .Pak.Name}}

+			{{range .Files}}
+				{{$src_html := srcLink .File.Path | html}}
+				{{range .Groups}}
+					{{range .}}
+						{{$src_html}}:{{infoLine .}}
+						{{infoSnippet_html .}}
+					{{end}}
+				{{end}}
+			{{end}}
+		{{end}}
+	{{end}}
+	{{with .Others}}
+		
Local declarations and uses

+		{{range .}}
+			{{$pkg_html := pkgLink .Pak.Path | html}}
+			
package {{html .Pak.Name}}

+			{{range .Files}}
+				{{$src_html := srcLink .File.Path | html}}
+				{{$src_html}}
+				
+				{{range .Groups}}
+					
+					
+					
+					
+					
+					
+				{{end}}
+				
{{index . 0 | infoKind_html}}
+					{{range .}}
+						{{infoLine .}}
+					{{end}}
+					

+			{{end}}
+		{{end}}
+	{{end}}
+{{end}}
+{{with .Textual}}
+	{{if $.Complete}}
+		
{{html $.Found}} textual occurrences

+	{{else}}
+		
More than {{html $.Found}} textual occurrences

+		

+		Not all files or lines containing "{{html $.Query}}" are shown.
+		

+	{{end}}
+	

+	
+	{{range .}}
+		{{$src_html := srcLink .Filename | html}}
+		
+		
+		
+		
+		
+		
+		
+	{{end}}
+	{{if not $.Complete}}
+		
+	{{end}}
+	

+		{{$src_html}}:
+		{{len .Lines}}
+		{{range .Lines}}
+			{{html .}}
+		{{end}}
+		{{if not $.Complete}}
+			...
+		{{end}}
+		
...

+	

+{{end}}
+`,
+	"search.txt": `QUERY
+	{{.Query}}
+
+{{with .Alert}}{{.}}
+{{end}}{{/* .Alert */}}{{/*
+
+---------------------------------------
+
+*/}}{{with .Alt}}DID YOU MEAN
+
+{{range .Alts}}	{{.}}
+{{end}}
+{{end}}{{/* .Alt */}}{{/*
+
+---------------------------------------
+
+*/}}{{with .Pak}}PACKAGE {{$.Query}}
+
+{{range .}}	{{pkgLink .Pak.Path}}
+{{end}}
+{{end}}{{/* .Pak */}}{{/*
+
+---------------------------------------
+
+*/}}{{with .Hit}}{{with .Decls}}PACKAGE-LEVEL DECLARATIONS
+
+{{range .}}package {{.Pak.Name}}
+{{range $file := .Files}}{{range .Groups}}{{range .}}	{{srcLink $file.File.Path}}:{{infoLine .}}{{end}}
+{{end}}{{end}}{{/* .Files */}}
+{{end}}{{end}}{{/* .Decls */}}{{/*
+
+---------------------------------------
+
+*/}}{{with .Others}}LOCAL DECLARATIONS AND USES
+
+{{range .}}package {{.Pak.Name}}
+{{range $file := .Files}}{{range .Groups}}{{range .}}	{{srcLink $file.File.Path}}:{{infoLine .}}
+{{end}}{{end}}{{end}}{{/* .Files */}}
+{{end}}{{end}}{{/* .Others */}}{{end}}{{/* .Hit */}}{{/*
+
+---------------------------------------
+
+*/}}{{if .Textual}}{{if .Complete}}{{.Found}} TEXTUAL OCCURRENCES{{else}}MORE THAN {{.Found}} TEXTUAL OCCURRENCES{{end}}
+
+{{range .Textual}}{{len .Lines}}	{{srcLink .Filename}}
+{{end}}{{if not .Complete}}...	...
+{{end}}{{end}}
+`,
+	"style.css": `body {
+	margin: 0;
+	font-family: Helvetica, Arial, sans-serif;
+	font-size: 16px;
+}
+pre,
+code {
+	font-family: Menlo, monospace;
+	font-size: 14px;
+}
+pre {
+	line-height: 18px;
+}
+pre .comment {
+	color: #006600;
+}
+pre .highlight,
+pre .highlight-comment,
+pre .selection-highlight,
+pre .selection-highlight-comment {
+	background: #FFFF00;
+}
+pre .selection,
+pre .selection-comment {
+	background: #FF9632;
+}
+pre .ln {
+	color: #999;
+}
+body {
+	color: #222;
+}
+a,
+.exampleHeading .text {
+	color: #375EAB;
+	text-decoration: none;
+}
+a:hover,
+.exampleHeading .text:hover {
+	text-decoration: underline;
+}
+p,
+pre,
+ul,
+ol {
+	margin: 20px;
+}
+pre {
+	background: #e9e9e9;
+	padding: 10px;
+
+	-webkit-border-radius: 5px;
+	-moz-border-radius: 5px;
+	border-radius: 5px;
+}
+
+h1,
+h2,
+h3,
+h4,
+.rootHeading {
+	margin: 20px 0;
+	padding: 0;
+	color: #375EAB;
+	font-weight: bold;
+}
+h1 {
+	font-size: 24px;
+}
+h2 {
+	font-size: 20px;
+	background: #E0EBF5;
+	padding: 2px 5px;
+}
+h3 {
+	font-size: 20px;
+}
+h3,
+h4 {
+	margin: 20px 5px;
+}
+h4 {
+	font-size: 16px;
+}
+.rootHeading {
+	font-size: 20px;
+	margin: 0;
+}
+
+dl {
+	margin: 20px;
+}
+dd {
+	margin: 2px 20px;
+}
+dl,
+dd {
+	font-size: 14px;
+}
+div#nav table td {
+	vertical-align: top;
+}
+
+table.dir th {
+	text-align: left;
+}
+table.dir td {
+	word-wrap: break-word;
+	vertical-align: top;
+}
+div#page.wide table.dir td.name {
+	white-space: nowrap;
+}
+.alert {
+	color: #AA0000;
+}
+
+div#heading {
+	float: left;
+	margin: 0 0 10px 0;
+	padding: 21px 0;
+	font-size: 20px;
+	font-weight: normal;
+}
+div#heading a {
+	color: #222;
+	text-decoration: none;
+}
+
+div#topbar {
+	background: #E0EBF5;
+	height: 64px;
+	overflow: hidden;
+}
+
+body {
+	text-align: center;
+}
+div#page {
+	width: 100%;
+}
+div#page > .container,
+div#topbar > .container {
+	text-align: left;
+	margin-left: auto;
+	margin-right: auto;
+	padding: 0 20px;
+	width: 900px;
+}
+div#page.wide > .container,
+div#topbar.wide > .container {
+	width: auto;
+}
+div#plusone {
+	float: right;
+	clear: right;
+	margin-top: 5px;
+}
+
+div#footer {
+	text-align: center;
+	color: #666;
+	font-size: 14px;
+	margin: 40px 0;
+}
+
+div#menu > a,
+div#menu > input,
+div#learn .buttons a,
+div.play .buttons a,
+div#blog .read a {
+	padding: 10px;
+
+	text-decoration: none;
+	font-size: 16px;
+
+	-webkit-border-radius: 5px;
+	-moz-border-radius: 5px;
+	border-radius: 5px;
+}
+div#playground .buttons a,
+div#menu > a,
+div#menu > input {
+	border: 1px solid #375EAB;
+}
+div#playground .buttons a,
+div#menu > a {
+	color: white;
+	background: #375EAB;
+}
+#playgroundButton.active {
+	background: white;
+	color: #375EAB;
+}
+a#start,
+div#learn .buttons a,
+div.play .buttons a,
+div#blog .read a {
+	color: #222;
+	border: 1px solid #375EAB;
+	background: #E0EBF5;
+}
+.download {
+	width: 150px;
+}
+
+div#menu {
+	float: right;
+	min-width: 590px;
+	padding: 10px 0;
+	text-align: right;
+}
+div#menu > a {
+	margin-right: 5px;
+	margin-bottom: 10px;
+
+	padding: 10px;
+}
+div#menu > input {
+	position: relative;
+	top: 1px;
+	width: 60px;
+	background: white;
+	color: #222;
+}
+div#menu > input.inactive {
+	color: #999;
+}
+
+div.left {
+	float: left;
+	clear: left;
+}
+div.right {
+	float: right;
+	clear: right;
+}
+div.left,
+div.right {
+	width: 415px;
+}
+
+div#learn,
+div#about {
+	padding-top: 20px;
+}
+div#learn h2,
+div#about {
+	margin: 0;
+}
+div#about {
+	font-size: 20px;
+}
+
+div#about {
+	height: 96px;
+}
+div#gopher {
+	background: url(/doc/gopher/frontpage.png) no-repeat;
+	background-position: center top;
+	height: 155px;
+}
+a#start {
+	display: block;
+	padding: 10px;
+
+	text-align: center;
+	text-decoration: none;
+
+	-webkit-border-radius: 5px;
+	-moz-border-radius: 5px;
+	border-radius: 5px;
+}
+a#start .big {
+	display: block;
+	font-weight: bold;
+	font-size: 20px;
+}
+a#start .desc {
+	display: block;
+	font-size: 14px;
+	font-weight: normal;
+	margin-top: 5px;
+}
+
+div#learn .icon {
+	float: right;
+	cursor: pointer;
+}
+div#learn pre,
+div#learn textarea {
+	padding: 0;
+	margin: 0;
+	font-family: Menlo, monospace;
+	font-size: 14px;
+}
+div#learn .input {
+	padding: 10px;
+	margin-top: 10px;
+	height: 150px;
+
+	-webkit-border-top-left-radius: 5px;
+	-webkit-border-top-right-radius: 5px;
+	-moz-border-radius-topleft: 5px;
+	-moz-border-radius-topright: 5px;
+	border-top-left-radius: 5px;
+	border-top-right-radius: 5px;
+}
+div#learn .input textarea {
+	width: 100%;
+	height: 100%;
+	border: none;
+	outline: none;
+	resize: none;
+}
+div#learn .output {
+	border-top: none !important;
+
+	padding: 10px;
+	height: 59px;
+	overflow: auto;
+
+	-webkit-border-bottom-right-radius: 5px;
+	-webkit-border-bottom-left-radius: 5px;
+	-moz-border-radius-bottomright: 5px;
+	-moz-border-radius-bottomleft: 5px;
+	border-bottom-right-radius: 5px;
+	border-bottom-left-radius: 5px;
+}
+div#learn .output pre {
+	padding: 0;
+
+	-webkit-border-radius: 0;
+	-moz-border-radius: 0;
+	border-radius: 0;
+}
+div#learn .input,
+div#learn .input textarea,
+div#learn .output,
+div#learn .output pre {
+	background: #FFFFD8;
+}
+div#learn .input,
+div#learn .output {
+	border: 1px solid #375EAB;
+}
+div#learn .buttons {
+	float: right;
+	padding: 20px 0 10px 0;
+	text-align: right;
+}
+div#learn .buttons a {
+	height: 16px;
+	margin-left: 5px;
+	padding: 10px;
+}
+div#learn .toys {
+	margin-top: 8px;
+}
+div#learn .toys select {
+	border: 1px solid #375EAB;
+	margin: 0;
+}
+div#learn .output .exit {
+	display: none;
+}
+
+div#blog,
+div#video {
+	margin-top: 40px;
+}
+div#blog > a,
+div#blog > div,
+div#blog > h2,
+div#video > a,
+div#video > div,
+div#video > h2 {
+	margin-bottom: 10px;
+}
+div#blog .title,
+div#video .title {
+	display: block;
+	font-size: 20px;
+}
+div#blog .when {
+	color: #666;
+	font-size: 14px;
+}
+div#blog .read {
+	text-align: right;
+}
+
+.toggleButton { cursor: pointer; }
+.toggle .collapsed { display: block; }
+.toggle .expanded { display: none; }
+.toggleVisible .collapsed { display: none; }
+.toggleVisible .expanded { display: block; }
+
+table.codetable { margin-left: auto; margin-right: auto; border-style: none; }
+table.codetable td { padding-right: 10px; }
+hr { border-style: none; border-top: 1px solid black; }
+
+img.gopher {
+	float: right;
+	margin-left: 10px;
+	margin-bottom: 10px;
+	z-index: -1;
+}
+.pkgGopher {
+	text-align: right;
+}
+.pkgGopher .gopher {
+	float: none;
+	position: relative;
+	top: -40px;
+	margin-bottom: -120px;
+}
+h2 { clear: right; }
+
+/* example and drop-down playground */
+div.play {
+	padding: 0 20px 40px 20px;
+}
+div.play pre,
+div.play textarea,
+div.play .lines {
+	padding: 0;
+	margin: 0;
+	font-family: Menlo, monospace;
+	font-size: 14px;
+}
+div.play .input {
+	padding: 10px;
+	margin-top: 10px;
+
+	-webkit-border-top-left-radius: 5px;
+	-webkit-border-top-right-radius: 5px;
+	-moz-border-radius-topleft: 5px;
+	-moz-border-radius-topright: 5px;
+	border-top-left-radius: 5px;
+	border-top-right-radius: 5px;
+
+	overflow: hidden;
+}
+div.play .input textarea {
+	width: 100%;
+	height: 100%;
+	border: none;
+	outline: none;
+	resize: none;
+
+	overflow: hidden;
+}
+div#playground .input textarea {
+	overflow: auto;
+	resize: auto;
+}
+div.play .output {
+	border-top: none !important;
+
+	padding: 10px;
+	max-height: 200px;
+	overflow: auto;
+
+	-webkit-border-bottom-right-radius: 5px;
+	-webkit-border-bottom-left-radius: 5px;
+	-moz-border-radius-bottomright: 5px;
+	-moz-border-radius-bottomleft: 5px;
+	border-bottom-right-radius: 5px;
+	border-bottom-left-radius: 5px;
+}
+div.play .output pre {
+	padding: 0;
+
+	-webkit-border-radius: 0;
+	-moz-border-radius: 0;
+	border-radius: 0;
+}
+div.play .input,
+div.play .input textarea,
+div.play .output,
+div.play .output pre {
+	background: #FFFFD8;
+}
+div.play .input,
+div.play .output {
+	border: 1px solid #375EAB;
+}
+div.play .buttons {
+	float: right;
+	padding: 20px 0 10px 0;
+	text-align: right;
+}
+div.play .buttons a {
+	height: 16px;
+	margin-left: 5px;
+	padding: 10px;
+	cursor: pointer;
+}
+.output .stderr {
+	color: #933;
+}
+.output .system {
+	color: #999;
+}
+
+/* drop-down playground */
+#playgroundButton,
+div#playground {
+	/* start hidden; revealed by javascript */
+	display: none;
+}
+div#playground {
+	position: absolute;
+	top: 63px;
+	right: 20px;
+	padding: 0 10px 10px 10px;
+	z-index: 1;
+	text-align: left;
+	background: #E0EBF5;
+
+	border: 1px solid #B0BBC5;
+	border-top: none;
+
+	-webkit-border-bottom-left-radius: 5px;
+	-webkit-border-bottom-right-radius: 5px;
+	-moz-border-radius-bottomleft: 5px;
+	-moz-border-radius-bottomright: 5px;
+	border-bottom-left-radius: 5px;
+	border-bottom-right-radius: 5px;
+}
+div#playground .code {
+	width: 520px;
+	height: 200px;
+}
+div#playground .output {
+	height: 100px;
+}
+`,
+}
diff --git a/godoc/vfs/mapfs/mapfs.go b/godoc/vfs/mapfs/mapfs.go
new file mode 100644
index 000000000..5dd20fdd1
--- /dev/null
+++ b/godoc/vfs/mapfs/mapfs.go
@@ -0,0 +1,81 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package mapfs file provides an implementation of the FileSystem
+// interface based on the contents of a map[string]string.
+package mapfs
+
+import (
+	"io"
+	"os"
+	"strings"
+	"time"
+
+	"code.google.com/p/go.tools/godoc/vfs"
+)
+
+func New(m map[string]string) vfs.FileSystem {
+	return mapFS(m)
+}
+
+// mapFS is the map based implementation of FileSystem
+type mapFS map[string]string
+
+func (fs mapFS) String() string { return "mapfs" }
+
+func (fs mapFS) Close() error { return nil }
+
+func filename(p string) string {
+	if len(p) > 0 && p[0] == '/' {
+		p = p[1:]
+	}
+	return p
+}
+
+func (fs mapFS) Open(p string) (vfs.ReadSeekCloser, error) {
+	b, ok := fs[filename(p)]
+	if !ok {
+		return nil, os.ErrNotExist
+	}
+	return nopCloser{strings.NewReader(b)}, nil
+}
+
+func (fs mapFS) Lstat(p string) (os.FileInfo, error) {
+	b, ok := fs[filename(p)]
+	if !ok {
+		return nil, os.ErrNotExist
+	}
+	return mapFI{name: p, size: int64(len(b))}, nil
+}
+
+func (fs mapFS) Stat(p string) (os.FileInfo, error) {
+	return fs.Lstat(p)
+}
+
+func (fs mapFS) ReadDir(p string) ([]os.FileInfo, error) {
+	var list []os.FileInfo
+	for fn, b := range fs {
+		list = append(list, mapFI{name: fn, size: int64(len(b))})
+	}
+	return list, nil
+}
+
+// mapFI is the map-based implementation of FileInfo.
+type mapFI struct {
+	name string
+	size int64
+}
+
+func (fi mapFI) IsDir() bool        { return false }
+func (fi mapFI) ModTime() time.Time { return time.Time{} }
+func (fi mapFI) Mode() os.FileMode  { return 0444 }
+func (fi mapFI) Name() string       { return fi.name }
+func (fi mapFI) Size() int64        { return fi.size }
+func (fi mapFI) Sys() interface{}   { return nil }
+
+type nopCloser struct {
+	io.ReadSeeker
+}
+
+func (nc nopCloser) Close() error { return nil }