[PATCH 3 of 3] cat: use the topmost repo when expanding node based format strings for output

[Matt Harbison]

Siddharth Agarwal wrote:
> On 03/22/2014 10:08 AM, Matt Harbison wrote:
>> # HG changeset patch
>> # User Matt Harbison <matt_harbison at yahoo.com>
>> # Date 1395456880 14400
>> # Node ID f4b974de9c952b027d8f137eb4d302d72eb7ea60
>> # Parent 35686f3835c908e3e681a0abd0c805476ccdfddc
>> cat: use the topmost repo when expanding node based format strings for
>> output
>
> Your first two patches look fine, but I'm not sure going to such
> contortions to fix undocumented features is worth it -- do we want to
> document them or not?
>

I'm not sure- I wasn't aware these worked either, and only stumbled 
across them accidentally while looking at something else.  I was really 
surprised how long they have been available and not documented, but 
maybe cat'ing to stdout and using shell redirection is how most people 
use it and nobody else thought to try these either?

I don't feel strongly about this one- I just submitted it because if 
somebody does document these someday, I wasn't sure if we would be able 
to make this (or equivalent) change in the future due to backward 
compatibility rules.  It's not likely anybody would think to test 
subrepos when simply documenting what already works.

It also looks easy enough to disable these- just don't pass the node to 
makefileobj().  But the hash and rev expansions at least seem marginally 
useful.

--Matt