[PATCH] revset: allow negative integers to list child revs

[Sean Farley]

Mads Kiilerich writes:

> On 10/06/2014 07:33 PM, Siddharth Agarwal wrote:
>> On 10/04/2014 09:57 AM, Sean Farley wrote:
>>> # HG changeset patch
>>> # User Sean Farley <sean.michael.farley at gmail.com>
>>> # Date 1412441841 25200
>>> #      Sat Oct 04 09:57:21 2014 -0700
>>> # Node ID c3bd6d6457bf42d2fbcaba89cf0418a0d0604239
>>> # Parent  78c916f24dd99a56e4c29153a5df3bd7d1c40edd
>>> revset: allow negative integers to list child revs
>>
>> I like the idea of having a shorthand for children, 
>
> Yeah, it seems like this really is a shorthand for children(X)?
>
>> but I'm not in favour of the shorthand being to select particular 
>> children. I think the shorthand we need is for 'all children' instead.
>
> Yes, it seems about right that the singlerev interpretation of that 
> would be the tipmost child.
>
>>
>> I might be OK with '^-1' to mean 'all children'.
>
> It could however be confusing that x^n gives a single revision for n = 
> 0, 1, 2 but a set for n = -1.
>
> The n in x^n designates which options to use. The n in x~n designates 
> distance from x. It would thus be more consistent to use x~-1 ... and it 
> would also be more that x~-2 should mean children(children(X)).

Sure, this works for me. By that, I mean, X~-2 is children(children(X)).