#!/usr/bin/env bash

# settings

ssdir="${XDG_PICTURES_DIR:-$HOME/Pictures}/screenshots"	# screenshots folder
maxsize=50	# (megabytes) size at which stuff starts getting deleted

####################################################################
# If the total size of files in the directory exceeds maxsize      #
# files will be deleted, oldest first, until total size is less    #
# than maxsize                                                     #
####################################################################

maxbytes=$(( maxsize * 1000000 ))
currbytes=$(du -b $ssdir | cut -f 1 -d $'\t')

if [ $currbytes -gt $maxbytes ]; then
	difference=$(( currbytes - maxbytes ))
	declare -a filesbyage=($(ls -1tr $ssdir))
	total=0
	i=0
	while [ $total -lt $difference ]; do
		total=$(( total + $(du -b $ssdir${filesbyage[$i]} | cut -f 1 -d $'\t') ))
		rm $ssdir${filesbyage[$i]}
		i=$(( i + 1 ))
	done
fi