Re: [feature request] git: tags instead of commit IDs in blame output

From: Johan Herland <johan@herland.net>
Date: Aug 21, 2010, 10:10 UTC
Message-ID: <201008211210.23280.johan@herland.net>
In-Reply-To: <20100821095352.604a2b85@hyperion.delvare>

On Saturday 21 August 2010, Jean Delvare wrote:

Show 11 quoted lines

> Hi there,
> 
> I have a feature request for git. In the output of "git blame", I would
> like to be able to see tags instead of commit IDs in front of each
> line. Basically, I would like to know the first tag which was added
> after the last change of every line. Icing on the cake would be the
> possibility to filter out some tags (for example to ignore release
> candidate tags) but I could easily live without that.
> 
> Does it make sense?
> Would it be difficult to implement?

To me, it seems what you want to do is convert the commit ID in front of every blame-line into the result of running 'git name-rev' (or 'git describe') on that line.

To that effect something like this should work:

  git blame <file> |
  while read sha1 rest
  do
      tag=$(git name-rev --tags --name-only $sha1) &&
      echo "$tag $rest"
  done

Of course, if you're doing this at a bigger scale, you want to wrap this in a script that (1) caches commitID -> tag mappings, and that (2) runs 'git name-rev in its --stdin mode'.

Have fun! :)

...Johan

-- 
Johan Herland, <johan@herland.net>
www.herland.net