[PATCH RFC] revset: use '%' as an operator for 'only'

[Matt Mackall]

On Fri, 2014-11-07 at 11:06 -0800, Sean Farley wrote:
> Sean Farley writes:
> 
> > Pierre-Yves David writes:
> >
> >> On 11/07/2014 06:15 PM, Sean Farley wrote:
> >>>
> >>> Pierre-Yves David writes:
> >>>
> >>>> On 11/07/2014 05:40 PM, Sean Farley wrote:
> >>>>>
> >>>>> Pierre-Yves David writes:
> >>>>>
> >>>>>> On 11/06/2014 10:56 PM, Sean Farley wrote:
> >>>>>>> # HG changeset patch
> >>>>>>> # User Sean Farley <sean.michael.farley at gmail.com>
> >>>>>>> # Date 1415314518 28800
> >>>>>>> #      Thu Nov 06 14:55:18 2014 -0800
> >>>>>>> # Node ID 752f70bee3b0542ca36b1fecbb70c954d6017061
> >>>>>>> # Parent  2d54aa5397cdb1c697673ba10b7618d5ac25c69e
> >>>>>>> revset: use '%' as an operator for 'only'
> >>>>>>
> >>>>>> Could we get an RevsetOperatorPLan page (or extension of an existing
> >>>>>> page). To list all the current and wished operators?
> >>>>>
> >>>>> Sure, go ahead and start one ;-) If you want me to start it, you'll have
> >>>>> to wait a little while :-/
> >>>>
> >>>> To clarify. I do not think we should accept this patch until we have a
> >>>> full plan defined.
> >>>>
> >>>> I'm ok with waiting a little while for more operator.
> >>>
> >>> http://mercurial.selenic.com/wiki/RevsetOperatorPlan
> >>
> >> Can I trick you into listing all the existing operator, then all the one 
> >> we consider (like successors, etc). Because actual expendend proposal?
> >
> > Sure.
> 
> Updated.

So.. % has some special meaning to cmd.exe and Powershell. Much like
Unix $, it may be replaced in some quoted strings.

As judged by the support requests we get, no living Windows users know
what "shell quoting" is and/or what the actual rules are, so this is a
bit of a problem. We need to make sure we're not likely to fall afoul of
any replacement rules in any vaguely probable scenario.

-- 
Mathematics is the supreme nostalgia of our time.