#!/bin/sh
# moses -- make backups
set -e

CMD=$1
DIR=$2

usage() {
  echo "usage:\n\
    moses new <directory> - make a new backup\n\
    moses del <directory> - delete the oldest backup"
  exit 1
}

if [ -z $CMD ]; then usage; fi
if [ -z $DIR ]; then usage; fi

new() {
  NAME=$DIR-$(date +%s).bak

  echo "creating $NAME..."
  cp -r $DIR $DIR-$(date +%s).bak
}

del() {
  OLDEST=$(find $(dirname $DIR) \
    -name "$(basename $DIR)-*.bak" \
    | sort \
    | head -n 1)

  echo "deleting $OLDEST..."
  rm -r $OLDEST
}

$CMD || usage