#!/bin/bash

usage() {
    echo -n "Usage: ${0}"
    echo -n " -d <root_dir>"
    echo -n " -D <older than time criteria> (example: '2 days ago')"
    echo
    exit 1
}

echo Starting $0 $*


# ---------------- cmdline
while getopts "d:D:" opt; do
  case ${opt} in
    d )
      RootDir=$OPTARG
      ;;
    D )
      DateCriteria=$OPTARG
      ;;
    \? )
      echo "Invalid option: -$OPTARG" >&2
      usage
      ;;
    : )
      echo "Option -$OPTARG requires an argument." >&2
      usage
      ;;
  esac
done

if  [ "${RootDir}" == "" ] || [ "${DateCriteria}" == "" ] ; then
    usage
fi

declare -A Settings=()
Settings[Src]=${RootDir}
Settings[PruneDate]=$(date -d "${DateCriteria}" '+%Y-%m-%d')

src=${Settings[Src]}
prune_date=${Settings[PruneDate]}

echo Before Pruning....
df -hT ${src}

echo "Finding files older than ${prune_date}..."
Cmd="find ${src} -type f ! -newermt \"${prune_date}\""
echo ${Cmd}
files=($(eval ${Cmd}))
echo "Total files to be pruned: ${#files[*]}"

for file in "${files[@]}" ; do
   Cmd="rm -f ${file}"
   echo ${Cmd}
   eval ${Cmd}
done

echo "Removing empty directories..."
Cmd="find ${src} -type d -empty -print -delete"
echo ${Cmd}
eval ${Cmd}

echo After Pruning....
df -hT ${src}

echo $0 Done