git log stats for author over time window with exclusion of vendor directories

git-author-stats.sh

#!/bin/bash

read -r -d '' REPOS << EOM
$GOPATH/src/github.com/uber-go/tally
EOM

FROM="500 weeks ago"
UNTIL="1 day ago"

curr=$(pwd)

i=0
commits=0
inserted=0
deleted=0
for repo in $(echo $REPOS | tr " " "\n"); do
  for author in $(echo $AUTHORS | tr "," "\n"); do
    i=$(expr $i + 1)
    if [ "$(expr $i % 2)" = 0 ]; then
       continue
    fi
    cd $repo
    echo $repo
    out=$(git log --shortstat --author "$author" --since "$FROM" --until "$UNTIL" -- $repo ":(exclude,glob)./oss_repos/**/*" ":(exclude,glob)./vendor/**/*" | fgrep 'file' | fgrep ' changed' | awk 'BEGIN {commits=0; inserted=0; deleted=0} {commits+=1; inserted+=$4; deleted+=$6} END {print "{\"commits\":", commits, ",\"lines_inserted\":", inserted, ", \"lines_deleted\":", deleted, "}"}')
    echo $out
    this_commits=$(echo $out | jq .commits)
    this_inserted=$(echo $out | jq .lines_inserted)
    this_deleted=$(echo $out | jq .lines_deleted)
    commits=$(expr $commits + $this_commits)
	inserted=$(expr $inserted + $this_inserted)
	deleted=$(expr $deleted + $this_deleted)
  done
done

echo "{\"total_commits\": ${commits}, \"total_inserted\": ${inserted}, \"total_deleted\": ${deleted}}"

cd $curr