godoc: Output "No match found" only if there is no ast or docs included in info.

Fixes golang/go#7499.

R=minux.ma
CC=golang-codereviews
https://golang.org/cl/75400043

cmd/godoc/godoc_test.go

@@ -16,32 +16,42 @@ import (
 )
 
 var godocTests = []struct {
-	args    []string
-	matches []string // regular expressions
+	args      []string
+	matches   []string // regular expressions
+	dontmatch []string // regular expressions
 }{
 	{
-		[]string{"fmt"},
-		[]string{
+		args: []string{"fmt"},
+		matches: []string{
 			`import "fmt"`,
 			`Package fmt implements formatted I/O`,
 		},
 	},
 	{
-		[]string{"io", "WriteString"},
-		[]string{
+		args: []string{"io", "WriteString"},
+		matches: []string{
 			`func WriteString\(`,
 			`WriteString writes the contents of the string s to w`,
 		},
 	},
 	{
-		[]string{"nonexistingpkg"},
-		[]string{
+		args: []string{"nonexistingpkg"},
+		matches: []string{
 			`no such file or directory|does not exist`,
 		},
 	},
 	{
-		[]string{"fmt", "NonexistentSymbol"},
-		[]string{
+		args: []string{"fmt", "NonexistentSymbol"},
+		matches: []string{
+			`No match found\.`,
+		},
+	},
+	{
+		args: []string{"-src", "syscall", "Open"},
+		matches: []string{
+			`func Open\(`,
+		},
+		dontmatch: []string{
 			`No match found\.`,
 		},
 	},
@@ -78,5 +88,11 @@ func TestGodoc(t *testing.T) {
 				t.Errorf("godoc %v =\n%s\nwanted /%v/", strings.Join(test.args, " "), out, pat)
 			}
 		}
+		for _, pat := range test.dontmatch {
+			re := regexp.MustCompile(pat)
+			if re.Match(out) {
+				t.Errorf("godoc %v =\n%s\ndid not want /%v/", strings.Join(test.args, " "), out, pat)
+			}
+		}
 	}
 }

godoc/static/package.txt

@@ -7,7 +7,7 @@
 
 ---------------------------------------
 
-*/}}{{if and $filtered (not .PDoc)}}No match found.
+*/}}{{if and $filtered (not (or .PDoc .PAst))}}No match found.
 {{end}}{{with .PDoc}}{{if $.IsMain}}COMMAND DOCUMENTATION
 
 {{comment_text .Doc "    " "\t"}}
@@ -111,4 +111,4 @@ package {{.Name}}
 */}}{{end}}{{/*
 Make sure there is no newline at the end of this file.
 perl -i -pe 'chomp if eof' package.txt
-*/}}
+*/}}

godoc/static/static.go

@@ -762,7 +762,7 @@ $(document).ready(function() {
 
 ---------------------------------------
 
-*/}}{{if and $filtered (not .PDoc)}}No match found.
+*/}}{{if and $filtered (not (or .PDoc .PAst))}}No match found.
 {{end}}{{with .PDoc}}{{if $.IsMain}}COMMAND DOCUMENTATION
 
 {{comment_text .Doc "    " "\t"}}
@@ -866,7 +866,8 @@ package {{.Name}}
 */}}{{end}}{{/*
 Make sure there is no newline at the end of this file.
 perl -i -pe 'chomp if eof' package.txt
-*/}}`,
+*/}}
+`,
 	"play.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.