Git repository statistics: Get # of commits and lines changed since some previous point in time

git-stats-overview.sh

#!/usr/bin/env bash
set -e

##
# @author Jay Taylor [@jtaylor]
#
# @date 2014-06-28
#
# @description Git repository statistics: Get # of commits and lines changed since some previous point in time.
#
test -z "$*" && echo 'error: missing required `git log` filter expression, e.g. "Apr 2[8-9] .* 2014"' 1>&2 && exit 1

startDate="$*"

commit="$(git log | grep -B 2 " ${startDate}" | tail -n3 | head -n1 | cut -d' ' -f2)"

test -z "${commit}" && echo "error: date ${startDate} not found" 1>&2 && exit 1

#echo "commit=${commit}"

commitCount="$(git log "${commit}..HEAD" | grep '^commit ' | wc -l | sed 's/^ \{1,\}//')"

stats="$(git diff --shortstat "${commit}..HEAD" | sed 's/^ \{1,\}//')"

echo "${commitCount} commits, ${stats}"

exit 0