Delete old remote git branches

clean_old_remote_branches.sh

USAGE="clean_old_remote_branches.sh

Remove branches from remote older than a specified threshold.

Arguments:

-h : print this message
-n, --dry-run : print actions, do not take them.

-d, --days : threshold for \"old\", in days. Default: 200
-l NUM, --limit NUM : do at most NUM branches
-v, --verbose : print out more info
"

DAYS=200

while [ -n "$1" ]; do
  case $1 in
    -h)
    echo $USAGE
    exit 0
    ;;

    -n | --dry-run)
    DRY_RUN=1
    shift
    ;;

    -l | --limit)
    LIMIT=$2
    shift; shift
    ;;

    -d | --days)
    DAYS=$1
    shift; shift
    ;;

    -v | --verbose)
    VERBOSE=1
    shift
    ;;

    *)
    echo $USAGE
    exit 1
    ;;

  esac
done

count=0
now=$(date +%s)
git branch -r | awk '{print $1}' | while read branch; do
  [ -n "$LIMIT" -a $count -ge "${LIMIT-0}" ] && break

  read ref author date <<< $(git log $branch -n 1 --date=unix --format="%h %ae %ad")
  age=$((now - date))
  days=$((age / 60 / 60 / 24))
  remote=$(echo $branch | cut -d/ -f1)
  branchname=$(echo $branch | cut -d/ -f2-)

  remove=0
  [ $days -gt $DAYS ] && remove=1

  if [ $remove = 1 ]; then
    count=$((count + 1))
    [ $DRY_RUN = 1 ] && echo "$count: $branch ($ref, $author): age = $days days"
    [ $DRY_RUN = 1 ] && echo [DRY RUN] git push "$remote" --delete "$branchname"
    [ $DRY_RUN = 0 ] && git push "$remote" --delete "$branchname"
  elif [ "$VERBOSE" = 1 ]; then
    echo "$count: $branch ($ref, $author): age = $days days"
  fi
done