[bzr-email:MERGE] special case logging a single non-merge revision

[John Arbash Meinel]

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John Arbash Meinel wrote:
| Now that we've been tuning stuff like 'bzr commit' for performance, I'm
| noticing
| that a good portion of the time spent in every commit is in 'bzr-email'.
| I broke
| it down into something like:
|
| ~  1.25s smtplib.starttls()
| ~  1.02s smtplib.connect()
| ~  2.00s show_log()
|
| There isn't a lot I can do about the time it takes to connect and start
| a tls
| connection. I did notice that it is a bit faster if I connect directly
| to the
| mail server, rather than going through an ssh tunnel. (of course, if I
| was going
| through an ssh tunnel, I wouldn't need starttls, but ...)
|
| Anyway, this patch just special cases when there is a single revision
to be
| displayed (no merges). We know we don't have dotted revnos, we already
| know the
| revno, etc.
|
| The patch is pretty small, and it cuts of 2 seconds during 'bzr commit'.
| Originally, I thought we could do the special casing in 'show_log', but
| that
| adds a lot of complexity for a rare use case. (It is quite common for
| bzr-email,
| but not for 'bzr log'.)
|
| John
| =:->

I have been using this for a while, and it works really well for me. As
nobody else has vetoed it, I went ahead and pushed it to trunk.

John
=:->
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