generate_diff_stat_csv.sh

#!/bin/bash
STARTDAY=20160102

echo "Week beginning, fileschanged, insertions, deletion"
for i in $(seq 0 44); do
    from=$(date +%Y-%m-%d --date $STARTDAY+${i}weeks)
    j=$(($i+1))
    to=$(date +%Y-%m-%d --date $STARTDAY+${j}weeks)

    fromcommit=$(git rev-list -n 1 --before=$from master)
    tocommit=$(git rev-list -n 1 --before=$to master)

    echo -n "$from, "
    git diff --shortstat $fromcommit..$tocommit | sed 's/\([0-9]*\) files changed, \([0-9]*\) insertions(+), \([0-9]*\) deletions(-)/\1, \2, \3 /'
done