#!/bin/bash

set -e


test_if_ancient()
{
    local d="$1"
    local ttl="$2"

    mtime="$(stat --format "%Y" "$d")"
    tod="$(($mtime + 3600*24*$ttl))"
    now="$(date +%s)"

    [ "$optVerbose" -ge "2" ] && echo "  Considering $d: ttl=$ttl, mod time=$mtime, time of death=$tod, now=$now"

    [ "$tod" -lt "$now" ] && return 0
    return 1
}


cleanit()
{
    local d="$1"
    local ttl="$2"

    if [ -e "$d/.publish.ttl" ]; then
       ttl="$(cat "$d/.publish.ttl")"
    fi

    if test_if_ancient "$d" "$ttl"; then
        [ "$optVerbose" -ge "1" ] && echo "Purge $d"
        [ "$optDonot" = "1" ]  || rm -rf "$d"
    fi
    return 0
}

usage()
{
    cat << EOF
usage: $0 [OPTIONS]

OPTIONS:
   -h     Show this message.
   -n     Do not actually purge directories, but show what would be done.
   -v     Give verbose output. Be more verbose with -vv.
EOF
}

optVerbose=0
optDonot=0

while getopts "hnv" OPTION; do
   case $OPTION in
      h)
         usage
         exit 0
         ;;
      n)
         optDonot=1
         ;;
      v)
         optVerbose=$(($optVerbose + 1))
         ;;
   esac
done


ttl=128
base=""
[ -e ~/.publish-purge.cfg ] && . ~/.publish-purge.cfg

if [ -z "$base" ]; then
    echo >&2 "$0: Please setup \$base in ~/.publish-purge.cfg"
    exit 1
fi

if ! [ -e "$base" ]; then
    echo >&2 "$0: $base does not exist or is not a directory"
    exit 1
fi

cd "$base"
# We would not like to accidentily delete files in the wrong directory, hence
# the paranoia check
if ! [ -e .publish-purge.token ]; then
    echo >&2 "$0: Place a .publish-purge.token in $base"
    exit 1
fi

for d in *; do
    cleanit "$d" "$ttl"
done


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