x/tools/cmd/godoc: sort package list into stdlib and GOPATH

[adg]

Brad: "I'd really like to see the standard library by itself, or at least broken up
by itself at the top of the page, with third-party GOPATH stuff at the bottom."

Russ: "If you really wanted to, you could do something like
http://golang.org/cl/5797067 But I am not sure it's such a good idea"

Brad: "Sounds like a great idea. Much prettier. What's the downside?"

Russ: "I have used systems with 'mostly sorted' lists before, and the convenience
always seems to give way to confusion, because people think they _are_ sorted and then
can't find things."

Robert: "Can we have different modes for looking at it?"

Brad: "The default is all that matters. There's already a flat mode (which I
prefer), but I can never remember how to get to it without looking up the source, which
I'm always too lazy to do. You could argue for mode-switching links, but therein lies
craziness."

[rsc]

Comment 1:

Maybe sorting is the wrong word and that what we should really do is group by root.

[bradfitz]

Comment 2:

FWIW this continues to bother me.  Grouping by root would be fine.  I'd be happen even
with two groups:
standard library $GOROOT first (bounded set, with short names), followed by all $GOPATHs
merged together and sorted (a huge set with longer names)

[rsc]

Comment 3:

Labels changed: added go1.1maybe.

[robpike]

Comment 5:

Labels changed: removed go1.1maybe.

[adg]

Comment 6:

Labels changed: added godoc.

[gopherbot]

Comment 7:

As a new user of the language, starting to build up my own little library packages as I
build more complicated programs, and starting to look at packages written by third
parties, I definitely would like a way for godoc to show somewhat more clearly which
packages are "core" libraries and which are third party.
Being able to have the list-of-packages stay as a sidebar when viewing the individual
package godoc pages would also be a win -- at least as somebody new to the language and
libraries I find myself surfing around between the list of all packages and individual
packages a lot, as I figure out what's where.

[adg]

Comment 8:

Issue #5784 has been merged into this issue.

[mewmew]

Comment 9:

issue #5571 is related to this issue and may be solved with a unified solution. For
instance it would be possible to include three sections in the package listing, namely:
* Standard repositories
* Sub-repositories
* Third party repositories

[mewmew]

Comment 10:

Sorry I meant issue #5561.

[pebbe]

Comment 11:

If you have many non-standard packages installed, it gets unwieldy to navigate.
I would like standard packages and each part of GOPATH to have its own section, and also
be able to collapse/expand each level. This idea:
http://pkleiweg.home.xs4all.nl/go/godoc-demo.html

[rsc]

Comment 12:

Labels changed: added go1.3maybe.

[rsc]

Comment 13:

Labels changed: added release-none, removed go1.3maybe.

[rsc]

Comment 14:

Labels changed: added repo-tools.