[MERGE] DWIM revspecs

[John Arbash Meinel]

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Matthew D. Fuller wrote:
> [ This is not actually ready for merging; BB tag added just for
>   tracking ]
> 
> This bundle adds the ability for revspec's to DWIM for the more common
> types, rather than requiring extra verbosity for everything but
> revnos.
> 
> The lookup order is:
> 1) If numeric (same test as previously), try revno
> 2) Tag
> 3) Revid
> 4) Date
> 5) Branch
> 6) Fail!
> 
> I decided on the lookup order both in terms of relative commonality
> (and thus a good guess at to likelihood of what the user wanted, if
> multiple hits were possible), and in terms of relative expense of
> calculation.  Revno is no more expensive than before (well, maybe a
> funciton call or two more overhead, but...).  Tags are cheap to fail;
> if it's not in the file, it ain't there.  Not 'till revid do we have
> to pull the whole history to necessarily fail.

So I haven't looked over the change, but I would like to offer that we
*allow* prefixes to avoid ambiguity, but if there isn't one, then we
will fall back to DWIM behavior.

Otherwise I'm fairly okay with DWIM for revspecs.

John
=:->

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