Commands like .code now have a TemplateCmd method
that returns the original command.
The Text struct now has a Raw field set when Pre==true.
It contains the original indented text, without the tab "fixing".
This helps building tooling that reformats or rewrites present files.
For golang/go#33955.
Change-Id: Ieb036e8b509a4531d120c597b19f2158306a5352
Reviewed-on: https://go-review.googlesource.com/c/tools/+/222845
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
