godoc: path cleanups, fixed a race condition, initial support for a menu on pages

R=rsc
CC=adg, golang-dev
https://golang.org/cl/215050

doc/style.css

@@ -198,6 +198,19 @@ span.highlight {
   background-color: #ffffa0;
 }
 
+/* same style as for gettingStarted */
+#menu {
+  margin-top: 1.5em;
+  margin-left: 1.75em;
+  margin-right: 0em;
+  float: right;
+  background-color: #fffff0;
+  padding-left: 1em;
+  padding-right: 1em;
+  padding-bottom: 0.75em;
+  border: 2px solid #ba9836;
+}
+
 
 /* ------------------------------------------------------------------------- */
 /* Styles for the frontpage */

lib/godoc/godoc.html

@@ -120,6 +120,13 @@
 </div>
 
 <div id="content">
+  <!-- Menu is HTML-escaped elsewhere -->
+  {.section Menu}
+    <div id="menu">
+      {@}
+    </div>
+  {.end}
+
   <h1 id="generatedHeader">{Title|html}</h1>
 
   <!-- The Table of Contents is automatically inserted in this <div>.

src/cmd/godoc/doc.go

@@ -27,12 +27,6 @@ The flags are:
 		width of tabs in units of spaces
 	-path=""
 		additional package directories (colon-separated)
-	-cmdroot="/goroot/src/cmd"
-		command source directory under -goroot (if unrooted, relative to cwd)
-	-tmplroot="/goroot/lib/godoc"
-		template directory under -goroot (if unrooted, relative to cwd)
-	-pkgroot="/goroot/src/pkg"
-		package source directory under -goroot (if unrooted, relative to cwd)
 	-html
 		print HTML in command-line mode
 	-goroot=$GOROOT

src/cmd/godoc/godoc.go

@@ -77,14 +77,9 @@ func (dt *delayTime) backoff(max int) {
 var (
 	verbose = flag.Bool("v", false, "verbose mode")
 
-	// "fixed" file system roots
-	goroot   string
-	cmdroot  string
-	pkgroot  string
-	tmplroot string
-
-	// additional file system roots to consider
-	path = flag.String("path", "", "additional package directories (colon-separated)")
+	// file system roots
+	goroot string
+	path   = flag.String("path", "", "additional package directories (colon-separated)")
 
 	// layout control
 	tabwidth = flag.Int("tabwidth", 4, "tab width")
@@ -106,19 +101,14 @@ func init() {
 		goroot = pathutil.Join(os.Getenv("HOME"), "go")
 	}
 	flag.StringVar(&goroot, "goroot", goroot, "Go root directory")
-
-	// other flags/variables that depend on goroot
-	flag.StringVar(&cmdroot, "cmdroot", pathutil.Join(goroot, "src/cmd"), "command source directory")
-	flag.StringVar(&pkgroot, "pkgroot", pathutil.Join(goroot, "src/pkg"), "package source directory")
-	flag.StringVar(&tmplroot, "tmplroot", pathutil.Join(goroot, "lib/godoc"), "template directory")
 }
 
 
 func initHandlers() {
 	fsMap.Init(*path)
 	fileServer = http.FileServer(goroot, "")
-	cmdHandler = httpHandler{"/cmd/", cmdroot, false}
-	pkgHandler = httpHandler{"/pkg/", pkgroot, true}
+	cmdHandler = httpHandler{"/cmd/", pathutil.Join(goroot, "src/cmd"), false}
+	pkgHandler = httpHandler{"/pkg/", pathutil.Join(goroot, "src/pkg"), true}
 }
 
 
@@ -790,7 +780,7 @@ var fmap = template.FormatterMap{
 
 
 func readTemplate(name string) *template.Template {
-	path := pathutil.Join(tmplroot, name)
+	path := pathutil.Join(goroot, "lib/godoc/"+name)
 	data, err := ioutil.ReadFile(path)
 	if err != nil {
 		log.Exitf("ReadFile %s: %v", path, err)
@@ -813,7 +803,7 @@ var (
 )
 
 func readTemplates() {
-	// have to delay until after flags processing, so that tmplroot is known
+	// have to delay until after flags processing since paths depend on goroot
 	dirlistHTML = readTemplate("dirlist.html")
 	errorHTML = readTemplate("error.html")
 	godocHTML = readTemplate("godoc.html")
@@ -832,6 +822,7 @@ func servePage(c *http.Conn, title, query string, content []byte) {
 		PkgRoots  []string
 		Timestamp uint64 // int64 to be compatible with os.Dir.Mtime_ns
 		Query     string
+		Menu      []byte
 		Content   []byte
 	}
 
@@ -841,6 +832,7 @@ func servePage(c *http.Conn, title, query string, content []byte) {
 		PkgRoots: fsMap.PrefixList(),
 		Timestamp: uint64(ts) * 1e9, // timestamp in ns
 		Query: query,
+		Menu: nil,
 		Content: content,
 	}
 
@@ -875,12 +867,6 @@ func commentText(src []byte) (text string) {
 }
 
 
-func serveError(c *http.Conn, r *http.Request, relpath string, err os.Error) {
-	contents := applyTemplate(errorHTML, "errorHTML", err)
-	servePage(c, "File "+relpath, "", contents)
-}
-
-
 func serveHTMLDoc(c *http.Conn, r *http.Request, abspath, relpath string) {
 	// get HTML body contents
 	src, err := ioutil.ReadFile(abspath)
@@ -1066,7 +1052,7 @@ func serveFile(c *http.Conn, r *http.Request) {
 	dir, err := os.Lstat(abspath)
 	if err != nil {
 		log.Stderr(err)
-		serveError(c, r, abspath, err)
+		serveError(c, r, relpath, err)
 		return
 	}
 
@@ -1136,8 +1122,9 @@ func (h *httpHandler) getPageInfo(relpath string, try bool) PageInfo {
 		log.Stderrf("parser.parseDir: %s", err)
 	}
 	if len(pkgs) != 1 && !try {
-		// TODO: should handle multiple packages
-		log.Stderrf("parser.parseDir: found %d packages", len(pkgs))
+		// TODO: should handle multiple packages,
+		//       error reporting disabled for now
+		// log.Stderrf("parser.parseDir: found %d packages", len(pkgs))
 	}
 
 	// Get the best matching package: either the first one, or the
@@ -1166,7 +1153,7 @@ func (h *httpHandler) getPageInfo(relpath string, try bool) PageInfo {
 
 	// get directory information
 	var dir *Directory
-	if tree, _ := fsTree.get(); tree != nil {
+	if tree, _ := fsTree.get(); tree != nil && tree.(*Directory) != nil {
 		// directory tree is present; lookup respective directory
 		// (may still fail if the file system was updated and the
 		// new directory tree has not yet been computed)

src/cmd/godoc/main.go

@@ -50,6 +50,12 @@ var (
 )
 
 
+func serveError(c *http.Conn, r *http.Request, relpath string, err os.Error) {
+	contents := applyTemplate(errorHTML, "errorHTML", err) // err may contain an absolute path!
+	servePage(c, "File "+relpath, "", contents)
+}
+
+
 func exec(c *http.Conn, args []string) (status int) {
 	r, w, err := os.Pipe()
 	if err != nil {
@@ -162,9 +168,6 @@ func main() {
 			log.Stderrf("Go Documentation Server\n")
 			log.Stderrf("address = %s\n", *httpaddr)
 			log.Stderrf("goroot = %s\n", goroot)
-			log.Stderrf("cmdroot = %s\n", cmdroot)
-			log.Stderrf("pkgroot = %s\n", pkgroot)
-			log.Stderrf("tmplroot = %s\n", tmplroot)
 			log.Stderrf("tabwidth = %d\n", *tabwidth)
 			if !fsMap.IsEmpty() {
 				log.Stderr("user-defined mapping:")