[PATCH] revset: add experimental set subscript operator

[Sean Farley]

Jun Wu <quark at fb.com> writes:

> Excerpts from Sean Farley's message of 2017-07-01 16:33:47 -0700:
>> > Yep. That's why I slightly prefer not using "{}".
>> >
>> >   $ hg log -T '{revset(".{0}")}\n'
>> >                          ^^^
>> >                    this is not a revset operator, but expanded to ''
>> 
>> I like separating {} and [] so that foo{4}[1] is the 4th level of
>> descendants of foo and the [1] would be the index in that list (ordered
>> by rev num?).
>
> Could it be foo[+4][1] meaning what you want? An explicit "+" means it's an
> offset, the "1" without a "+" means it's a normal index.

Hmmm, I'll have to mull on that. My gut feeling is that it might be too
magical. Though, we're severely limited on characters so it might be the
least-worst option.
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