git-guilt

Show total blame count for files with unstaged changes or calculate the change in blame between two revisions.

Show total blame count

$ git guilt

Calculate the change in blame between two revisions

$ git guilt [first_revision] [last_revision]

Show author emails instead of names

$ git guilt --email

Ignore whitespace only changes when attributing blame

$ git guilt --ignore-whitespace

Find blame delta over the last three weeks

$ git guilt 'git log --until="3 weeks ago" --format="%H" -n 1'

Find blame delta over the last three weeks (git 1.8.5+)

$ git guilt @{3.weeks.ago}