Distinguish between html generation and html quoting in godoc formatters.

Replacement for CL 184084; originally by Roger Peppe (rogpeppe@gmail.com).

R=rsc
CC=golang-dev, rog
https://golang.org/cl/189059

lib/godoc/dirlist.html

@@ -18,7 +18,7 @@
 </tr>
 {.repeated section @}
 <tr>
-	<td align="left"><a href="{Name|html}{@|dir/}">{Name|html}{@|dir/}</a></td>
+	<td align="left"><a href="{Name|html-esc}{@|dir/}">{Name|html}{@|dir/}</a></td>
 	<td></td>
 	<td align="right">{Size|html}</td>
 	<td></td>

lib/godoc/godoc.html

@@ -106,7 +106,7 @@
     <li class="blank">&nbsp;</li>
     <li class="navhead">Go code search</li>
     <form method="GET" action="/search" class="search">
-    <input type="search" name="q" value="{Query|html}" size="25" style="width:80%; max-width:200px" />
+    <input type="search" name="q" value="{Query|html-esc}" size="25" style="width:80%; max-width:200px" />
     <input type="submit" value="Go" />
     </form>
 

lib/godoc/package.html

@@ -16,7 +16,7 @@
 			<h4>Package files</h4>
 			<span style="font-size:90%">
 			{.repeated section @}
-				<a href="/{FilePath|html}/{@|html}">{@|html}</a>
+				<a href="/{FilePath|html-esc}/{@|html-esc}">{@|html}</a>
 			{.end}
 			</span>
 			</p>
@@ -38,14 +38,14 @@
 	{.end}
 	{.section Funcs}
 		{.repeated section @}
-			<h2 id="{Name|html}">func <a href="{Decl|link}">{Name|html}</a></h2>
+			<h2 id="{Name|html-esc}">func <a href="{Decl|link}">{Name|html}</a></h2>
 			<p><code>{Decl|html}</code></p>
 			{Doc|html-comment}
 		{.end}
 	{.end}
 	{.section Types}
 		{.repeated section @}
-			<h2 id="{Type.Name|html}">type <a href="{Decl|link}">{Type.Name|html}</a></h2>
+			<h2 id="{Type.Name|html-esc}">type <a href="{Decl|link}">{Type.Name|html}</a></h2>
 			{Doc|html-comment}
 			<p><pre>{Decl|html}</pre></p>
 			{.repeated section Consts}
@@ -57,12 +57,12 @@
 				<pre>{Decl|html}</pre>
 			{.end}
 			{.repeated section Factories}
-				<h3 id="{Type.Name|html}.{Name|html}">func <a href="{Decl|link}">{Name|html}</a></h3>
+				<h3 id="{Type.Name|html-esc}.{Name|html-esc}">func <a href="{Decl|link}">{Name|html}</a></h3>
 				<p><code>{Decl|html}</code></p>
 				{Doc|html-comment}
 			{.end}
 			{.repeated section Methods}
-				<h3 id="{Type.Name|html}.{Name|html}">func ({Recv|html}) <a href="{Decl|link}">{Name|html}</a></h3>
+				<h3 id="{Type.Name|html-esc}.{Name|html-esc}">func ({Recv|html}) <a href="{Decl|link}">{Name|html}</a></h3>
 				<p><code>{Decl|html}</code></p>
 				{Doc|html-comment}
 			{.end}
@@ -80,7 +80,7 @@
 	<p>
 	<table class="layout">
 	<tr>
-	<th align="left" colspan="{MaxHeight|html}">Name</th>
+	<th align="left" colspan="{MaxHeight|html-esc}">Name</th>
 	<td width="25">&nbsp;</td>
 	<th align="left">Synopsis</th>
 	</tr>
@@ -90,7 +90,7 @@
 	{.repeated section List}
 		<tr>
 		{Depth|padding}
-		<td align="left" colspan="{Height|html}"><a href="{Path|html}">{Name|html}<a></td>
+		<td align="left" colspan="{Height|html-esc}"><a href="{Path|html-esc}">{Name|html}<a></td>
 		<td></td>
 		<td align="left">{Synopsis|html}</td>
 		</tr>

lib/godoc/search.html

@@ -14,7 +14,7 @@
 	<p>
 	<span class="alert" style="font-size:120%">Did you mean: </span>
 	{.repeated section Alts}
-		<a href="search?q={@|html}" style="font-size:120%">{@|html}</a>
+		<a href="search?q={@|html-esc}" style="font-size:120%">{@|html}</a>
 	{.end}
 	</p>
 {.end}
@@ -26,7 +26,7 @@
 			{.repeated section Files}
 				{.repeated section Groups}
 					{.repeated section Infos}
-						<a href="{File.Path|html}?h={Query|html}#L{@|infoLine}">{File.Path|html}:{@|infoLine}</a>
+						<a href="{File.Path|html-esc}?h={Query|html-esc}#L{@|infoLine}">{File.Path|html}:{@|infoLine}</a>
 						<pre>{@|infoSnippet}</pre>
 					{.end}
 				{.end}
@@ -38,7 +38,7 @@
 		{.repeated section @}
 			<h3 id="Local_{Pak.Path|path}">package <a href="{Pak.Path|path}">{Pak.Name|html}</a></h3>
 			{.repeated section Files}
-				<a href="{File.Path|html}?h={Query|html}">{File.Path|html}</a>
+				<a href="{File.Path|html-esc}?h={Query|html-esc}">{File.Path|html}</a>
 				<table class="layout">
 				{.repeated section Groups}
 					<tr>
@@ -47,7 +47,7 @@
 					<td align="left" width="4"></td>
 					<td>
 					{.repeated section Infos}
-						<a href="{File.Path|html}?h={Query|html}#L{@|infoLine}">{@|infoLine}</a>
+						<a href="{File.Path|html-esc}?h={Query|html-esc}#L{@|infoLine}">{@|infoLine}</a>
 					{.end}
 					</td>
 					</tr>

src/cmd/godoc/godoc.go

@@ -587,6 +587,14 @@ func htmlFmt(w io.Writer, x interface{}, format string) {
 }
 
 
+// Template formatter for "html-esc" format.
+func htmlEscFmt(w io.Writer, x interface{}, format string) {
+	var buf bytes.Buffer
+	writeAny(&buf, x, false)
+	template.HTMLEscape(w, buf.Bytes())
+}
+
+
 // Template formatter for "html-comment" format.
 func htmlCommentFmt(w io.Writer, x interface{}, format string) {
 	var buf bytes.Buffer
@@ -705,6 +713,7 @@ func dirslashFmt(w io.Writer, x interface{}, format string) {
 var fmap = template.FormatterMap{
 	"": textFmt,
 	"html": htmlFmt,
+	"html-esc": htmlEscFmt,
 	"html-comment": htmlCommentFmt,
 	"path": pathFmt,
 	"link": linkFmt,