cmd/godoc: add support for display Notes parsed by pkg/go/doc

pkg/go/doc: move BUG notes from Package.Bugs to the general Package.Notes field.
Removing .Bugs would break existing code so it's left in for now.

R=gri, gri, gary.burd, dsymonds, rsc, kevlar
CC=golang-dev
https://golang.org/cl/7341053

lib/godoc/package.html

@@ -70,12 +70,9 @@
 					<dd>&nbsp; &nbsp; <a href="#{{$tname_html}}.{{$name_html}}">{{node_html .Decl $.FSet}}</a></dd>
 				{{end}}
 			{{end}}
-			{{if .Bugs}}
-				<dd><a href="#pkg-bugs">Bugs</a></dd>
-			{{end}}
-			{{if .Notes}}
-                                {{range $marker, $item := .Notes}}
-				<dd><a href="#pkg-{{$marker}}">{{$marker}}</a></dd>
+			{{if $.Notes}}
+                                {{range $marker, $item := $.Notes}}
+				<dd><a href="#pkg-note-{{$marker}}">{{noteTitle $marker | html}}s</a></dd>
                                 {{end}}
 			{{end}}
 			</dl>
@@ -167,15 +164,9 @@
 		{{comment_html .Doc}}
 	{{end}}
 
-	{{with .Bugs}}
-		<h2 id="pkg-bugs">Bugs</h2>
-		{{range .}}
-		{{comment_html .}}
-		{{end}}
-	{{end}}
-	{{with .Notes}}
+	{{with $.Notes}}
                 {{range $marker, $content := .}}
-		    <h2 id="pkg-{{$marker}}">{{$marker}}</h2>
+		    <h2 id="pkg-note-{{$marker}}">{{noteTitle $marker | html}}s</h2>
 		    {{range .}}
 		    {{comment_html .}}
                     {{end}}

lib/godoc/package.txt

@@ -62,13 +62,9 @@ TYPES
 
 ---------------------------------------
 
-*/}}{{with .Bugs}}
-BUGS
-
-{{range .}}{{comment_text . "    " "\t"}}
-{{end}}{{end}}{{with .Notes}}
+*/}}{{with $.Notes}}
 {{range $marker, $content := .}}
-{{$marker}}
+{{noteTitle $marker}}s
 
 {{range $content}}{{comment_text . "    " "\t"}}
 {{end}}{{end}}{{end}}{{end}}{{/*

src/cmd/godoc/godoc.go

@@ -446,6 +446,10 @@ func example_suffixFunc(name string) string {
 	return suffix
 }
 
+func noteTitle(note string) string {
+	return strings.Title(strings.ToLower(note))
+}
+
 func splitExampleName(s string) (name, suffix string) {
 	i := strings.LastIndex(s, "_")
 	if 0 <= i && i < len(s)-1 && !startsWithUppercase(s[i+1:]) {
@@ -539,6 +543,9 @@ var fmap = template.FuncMap{
 	"example_text":   example_textFunc,
 	"example_name":   example_nameFunc,
 	"example_suffix": example_suffixFunc,
+
+	// formatting of Notes
+	"noteTitle": noteTitle,
 }
 
 func readTemplate(name string) *template.Template {
@@ -897,11 +904,12 @@ type PageInfo struct {
 	Err     error  // error or nil
 
 	// package info
-	FSet     *token.FileSet // nil if no package documentation
-	PDoc     *doc.Package   // nil if no package documentation
-	Examples []*doc.Example // nil if no example code
-	PAst     *ast.File      // nil if no AST with package exports
-	IsMain   bool           // true for package main
+	FSet     *token.FileSet      // nil if no package documentation
+	PDoc     *doc.Package        // nil if no package documentation
+	Examples []*doc.Example      // nil if no example code
+	Notes    map[string][]string // nil if no package Notes
+	PAst     *ast.File           // nil if no AST with package exports
+	IsMain   bool                // true for package main
 
 	// directory info
 	Dirs    *DirList  // nil if no directory information
@@ -1082,6 +1090,17 @@ func (h *docServer) getPageInfo(abspath, relpath string, mode PageInfoMode) (inf
 				log.Println("parsing examples:", err)
 			}
 			info.Examples = collectExamples(pkg, files)
+
+			// collect any notes that we want to show
+			if info.PDoc.Notes != nil {
+				info.Notes = make(map[string][]string)
+				for _, m := range notesToShow {
+					if n := info.PDoc.Notes[m]; n != nil {
+						info.Notes[m] = n
+					}
+				}
+			}
+
 		} else {
 			// show source code
 			// TODO(gri) Consider eliminating export filtering in this mode,

src/cmd/godoc/main.go

@@ -71,6 +71,11 @@ var (
 
 	// command-line searches
 	query = flag.Bool("q", false, "arguments are considered search queries")
+
+	// which code 'Notes' to show.
+	notes = flag.String("notes", "BUG", "comma separated list of Note markers as per pkg:go/doc")
+	// vector of 'Notes' to show.
+	notesToShow []string
 )
 
 func serveError(w http.ResponseWriter, r *http.Request, relpath string, err error) {
@@ -157,6 +162,8 @@ func main() {
 	flag.Usage = usage
 	flag.Parse()
 
+	notesToShow = strings.Split(*notes, ",")
+
 	// Check usage: either server and no args, command line and args, or index creation mode
 	if (*httpAddr != "" || *urlFlag != "") != (flag.NArg() == 0) && !*writeIndex {
 		usage()

src/pkg/go/doc/doc.go

@@ -17,7 +17,10 @@ type Package struct {
 	ImportPath string
 	Imports    []string
 	Filenames  []string
-	Bugs       []string
+	// DEPRECATED. For backward compatibility Bugs is still populated,
+	// but all new code should use Notes instead.
+	Bugs []string
+
 	// Notes such as TODO(userid): or SECURITY(userid):
 	// along the lines of BUG(userid). Any marker with 2 or more upper
 	// case [A-Z] letters is recognised.

src/pkg/go/doc/reader.go

@@ -412,7 +412,6 @@ func readNote(c *ast.CommentGroup) (marker, annotation string) {
 			// non-empty MARKER comment; collect comment without the MARKER prefix
 			list := append([]*ast.Comment(nil), c.List...) // make a copy
 			list[0].Text = m[2]
-
 			return m[1], (&ast.CommentGroup{List: list}).Text()
 		}
 	}
@@ -487,12 +486,9 @@ func (r *reader) readFile(src *ast.File) {
 	// collect MARKER(...): annotations
 	for _, c := range src.Comments {
 		if marker, text := readNote(c); marker != "" {
-			// Remove r.bugs in a separate CL along with
-			// any necessary changes to client code.
+			r.notes[marker] = append(r.notes[marker], text)
 			if marker == "BUG" {
 				r.bugs = append(r.bugs, text)
-			} else {
-				r.notes[marker] = append(r.notes[marker], text)
 			}
 		}
 	}

src/pkg/go/doc/testdata/a.0.golden

@@ -8,13 +8,17 @@ FILENAMES
 	testdata/a0.go
 	testdata/a1.go
 
+BUGS .Bugs is now deprecated, please use .Notes instead
+	// bug0 
+	// bug1 
+
 BUGS
 	// bug0 
 	// bug1 
 
-SECBUG
+SECBUGS
 	// sec hole 0 need to fix asap 
 
-TODO
+TODOS
 	// todo0 
 	// todo1 

src/pkg/go/doc/testdata/a.1.golden

@@ -8,13 +8,17 @@ FILENAMES
 	testdata/a0.go
 	testdata/a1.go
 
+BUGS .Bugs is now deprecated, please use .Notes instead
+	// bug0 
+	// bug1 
+
 BUGS
 	// bug0 
 	// bug1 
 
-SECBUG
+SECBUGS
 	// sec hole 0 need to fix asap 
 
-TODO
+TODOS
 	// todo0 
 	// todo1 

src/pkg/go/doc/testdata/a.2.golden

@@ -8,13 +8,17 @@ FILENAMES
 	testdata/a0.go
 	testdata/a1.go
 
+BUGS .Bugs is now deprecated, please use .Notes instead
+	// bug0 
+	// bug1 
+
 BUGS
 	// bug0 
 	// bug1 
 
-SECBUG
+SECBUGS
 	// sec hole 0 need to fix asap 
 
-TODO
+TODOS
 	// todo0 
 	// todo1 

src/pkg/go/doc/testdata/a0.go

@@ -9,5 +9,9 @@ package a
 
 //TODO(uid): todo0
 
+// A note with some spaces after it, should be ignored (watch out for
+// emacs modes that remove trailing whitespace).
+//NOTE(uid):
+
 // SECBUG(uid): sec hole 0
 // need to fix asap

src/pkg/go/doc/testdata/template.txt

@@ -60,9 +60,9 @@ TYPES
 {{end}}{{end}}{{end}}{{/*
 
 */}}{{with .Bugs}}
-BUGS
+BUGS .Bugs is now deprecated, please use .Notes instead
 {{range .}}	{{synopsis .}}
 {{end}}{{end}}{{with .Notes}}{{range $marker, $content := .}}
-{{$marker}}
+{{$marker}}S
 {{range $content}}	{{synopsis .}}
 {{end}}{{end}}{{end}}