From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff King <peff@peff.net>
Subject: Re: [PATCH 2/2] Add Author and Documentation sections to
 git-for-each-ref.txt
Date: Thu, 17 Mar 2011 15:34:50 -0400
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Cc: Alexei Sholik <alcosholik@gmail.com>,
	Michael J Gruber <git@drmicha.warpmail.net>,
	git@vger.kernel.org
To: Will Palmer <wmpalmer@gmail.com>
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On Thu, Mar 17, 2011 at 02:20:08PM +0000, Will Palmer wrote:

> On Wed, 2011-03-09 at 14:14 +0200, Alexei Sholik wrote:
> > .................. Just ran this command
> > 
> > git blame -p "$1" | awk '$1 ~ /author$/ { print substr($0,
> > length("author  "), length($0)) }' | sort | uniq -c | sort -nr
> > 
> > on the for-each-ref.c and saw that Junio had the first place by a
> > relatively large margin.
> > 
> 
> Wrap that up in a script and submit /that/ as a patch ;)

That just counts the number of commits that have any surviving line in a
given file. So it's slightly better than "shortlog -ns" in that it
removes commits whose contents have been totally rewritten (and it
properly handles content-following). But if you are going to use blame,
the more interesting measure is probably a count of lines attributed to
each author.  Something like:

  git blame -p "$1" | perl -ne '
    if (/^([0-9a-f]{40})/) {
      $sha1 = $1;
      $count{$sha1}++;
    }
    elsif (/^author (.*)/) {
      $author{$sha1} = $1;
    }
    END {
      foreach my $sha1 (keys(%count)) {
        $r{$author{$sha1}} += $count{$sha1};
      }
      foreach my $a (sort { $r{$b} <=> $r{$a} } keys(%r)) {
        print "$r{$a} $a\n";
      }
    }
  '

-Peff