Git extension that shows aggregate --numstat information by author.

git-stats

#!/bin/bash

# Usage: git stats [options]
# options are any git options that you would pass to "git log", such as "--since 14.days" or path/to/file/or/directory
#
# Prints commit stats alphabetically by author: number of files changes, number of lines inserted, number of lines deleted.
#
# To sort by files changed, use sort like so:   git stats | sort -t, -bn -k2
# This tells sort to separate fields by comma, then do a numerical sort on the second field (files changed), ignoring leading whitespace
# (That works with gnu and BSD sort.)

gitargs="$@"
while read author
do
  echo -n "$author, "
  git log --author "$author" --numstat $gitargs | awk '/^[1-9]/ { files += 1; ins += $1; del += $2 } END { print files " files changed, " ins " insertions(+), " del " deletions(-)" }'
done < <(git log --format='%aN' $gitargs | sort -u)