Re: Effectively tracing project contributions with git

From: Jeff King <peff@peff.net>
Date: Sep 13, 2009, 09:24 UTC
Message-ID: <20090913092429.GA14438@coredump.intra.peff.net>
In-Reply-To: <20090913022843.GB26588@mit.edu>

On Sat, Sep 12, 2009 at 10:28:43PM -0400, Theodore Tso wrote:

Show 17 quoted lines

> > I don't see any solution that doesn't see me browsing diffs -- there's
> > no metric that will solve the problem -- but if your stats work could
> > help me get an output of the form 'here are all the diffs on file X by
> > contributor Y in order of size, largest first' then I think it would
> > help a LOT.
> 
> This will display all of the diffs on file (pathname) XXX by contributor YYY:
> 
> 	git log -p --author=YYY XXX 
> 
> You might also find the diffstats useful:
> 
> 	git log --stat --author=YYY XXX
> 
> Or if you want *only* the diffstats for the file in question, you might try:
> 
> 	git log --stat --pretty=format: --author=YYY XXX | grep XXX

There is also the "--numstat" format which is a bit easier for parsing. I think the "all diffs on file $X by contributor $Y, ordered by size" would look like:

  git log -z --pretty=tformat:%H --numstat --author=$Y $X |
  perl -0ne '
    my ($commit) = /^([0-9a-f]{40})$/m;
    my ($lines_added) = /^(\d+)\s/m;
    print "$lines_added $commit\n";
  ' |
  sort -rn |
  cut -d ' ' -f2 |
  xargs -n 1 git show

-Peff