godoc: provide mode which shows exported interface in "source form"

- on the commandline: godoc -x big
- in a webpage: provide form parameter ?m=src

Known issues:
- Positioning of comments incorrect in several cases. Separate CL.
- Need a link/menu to switch between different modes of presentation
  in the web view.

R=rsc
CC=golang-dev
http://codereview.appspot.com/376041

2 files changed, 8 insertions, 0 deletions

diff --git a/lib/godoc/package.html b/lib/godoc/package.html
index 2113e46bd..c0cd18f31 100644
--- a/lib/godoc/package.html
+++ b/lib/godoc/package.html
@@ -4,6 +4,11 @@
 	license that can be found in the LICENSE file.
 -->
 
+{.section PAst}
+	<pre>
+	{@|html}
+	</pre>
+{.end}
 {.section PDoc}
 	<!-- PackageName is printed as title by the top-level template -->
 	{.section IsPkg}
diff --git a/lib/godoc/package.txt b/lib/godoc/package.txt
index 77d20f49f..b9203ff21 100644
--- a/lib/godoc/package.txt
+++ b/lib/godoc/package.txt
@@ -1,3 +1,6 @@
+{.section PAst}
+{@}
+{.end}
 {.section PDoc}
 {.section IsPkg}
 PACKAGE