[Patch] Support for multiple revisions for diff command

[Garrett Rooney]

Johan Rydberg wrote:
> John A Meinel <john at arbash-meinel.com> writes:
> 
> 
>>>It's a little counter intertuitive (perhaps) but to get the diff for revno
>>>440 you have to run 'bzr diff -r 439 -r2 440'.
>>
>>Why not use one of the other syntaxes. Such as
>>
>>bzr diff ./@439 ./@440
>>bzr diff @439 @440
>>(mabye bzr diff 439 440 but these could be filenames)
>>bzr diff -r 439:440
>>etc.
> 
> 
> Using -r and -r2, besides looking horrible, must also break the short 
> option patch.
> 
> Anyway, I vote for the @-case. e.g., bzr diff foo at X bar at Y

I'd recommend supporting both foo at X bar at Y and -r X:Y, since both are 
useful in different cases.  The common case for my is comparing two 
versions of the same tree, thus making -r X:Y useful, but occiasionally 
you might want to compare two versions of different trees, requiring the 
use of foo at X bar at Y format.