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Re: misaligned blame output if repo has >1m revisions

From: Branko ─îibej <brane_at_xbc.nu>
Date: Sun, 18 Apr 2010 23:34:46 +0200

Johan Corveleyn wrote:
> Hi all,
>
> Sorry it took a while to respond (been away for a while). I've been
> thinking a little about this, looking at the code ...
>
> I see 3 options:
>
> 1) Determine the max length of revnum (and author) in blame.c, either
> while building the blame chunks or in an extra loop before sending the
> blame info to the blame receiver (and adding the max length(s) as
> extra parameters to the receiver).
>
> 2) Determine the max length of revnum (and author) in blame_cmd.c,
> i.e. the command line command. To do this, it would have to buffer the
> blame info that it receives in the blame_receiver callback,
> determining the maximum length(s) in the meantime.
>
> 3) Add some fixed amount of extra characters to revnum and/or author.
>
>
> I don't like 1) and 2). With 1) we're introducing overhead in blame.c
> (and messing with the blame_receiver API) for something that's only
> needed for command line use. I suppose all the GUI clients don't care
> about these lengths, so they shouldn't be impacted by something that's
> only needed for cmd line.
>
> And 2), it really seems a bad idea to introduce buffering of the
> entire blame info (hence the entire file that's being blamed), just to
> fix the alignment (memory footprint, not as streamy anymore, ...).
>
> So, I'd like to do 3), and add just 1 (one) extra character for
> revnum. With 1 extra character, we'd have up to 9,999,999 for revnum.
> Even for http://websvn.kde.org/trunk/, starting at 1113881 and adding
> 100k revisions every 8 months, that would give us 59 years until we
> hit that (let's say it accelerates somewhat, so 30 years might be a
> better estimate, but that's still plenty of time).
>

And still not solve anything for anybody.

Instead why not do the following:

    * Determining the max length for the revision number is a petty much
      constant-time operation; you either get it explicitly from blame
      options (-rN:M) or implicitly from HEAD.
    * Just truncate the svn:author for now. If we can do that in "svn
      ls" there's no reason not to do it in "svn blame". Perhaps someday
      the repository API will provide an easy way to index and access
      all revprop values without having to walk all of history. But for
      now, just punt. Adding another column to that field is not really
      any kind of solution.

And last but not least, leave the actuall formatting to the reporter.
GUIs can do variable-width columns much more easily than text-based
interfaces.

-- Brane
Received on 2010-04-18 23:35:24 CEST

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