Automatically processes all images in a folder to svg by reproducing the image with triangles

watch_convert_dir.sh

#!/bin/bash
set -x ## Print all executed commands to the terminal
set -e ## Exit immediately if a command exits with a non-zero status

# Example usage
# download/install https://github.com/fogleman/primitive
# cd ~/Develop/Go
# mkdir -p n100 n100/n100_src n100/n100_dst
# ./watch_convert_dir.sh n100 n100/n100_src n100/n100_dst 100 -r 64 bg #000000
# ./watch_convert_dir.sh n200 n200/n200_src n200/n200_dst 200 -m 0

#
# Parse arguments
#
function show_usage() {
	echo -e "Usage: $0 src_dir fin_dir dst_dir n (optional: additional options for generation)"
}

if [[ $# -lt 4 ]]; then
	show_usage
	exit 0
fi

DIR="$1"     # source dir: files to be converted
FNT_DIR="$2" # finished dir: source files to be moved elsewhere then generation finishes
DST_DIR="$3" # destination dir: for newly generated files
N="$4"

function convert_all_dir() {
	for SRC_FILE in $(ls $DIR | egrep "\.png|\.jpg|\.PNG|\.JPG$"); do
		DST_FILE=$(echo $DIR/$SRC_FILE | sed -e "s~png~svg~Ig" -e "s~jpg~svg~Ig" -e "s~$DIR~$DST_DIR~ig")
		SRC_FILE_FINISHED=$(echo $DIR/$SRC_FILE | sed "s~$DIR~$FNT_DIR~g")
		$GOPATH/bin/primitive -n $N -i $DIR/$SRC_FILE -o $DST_FILE "$@"
		mv $DIR/$SRC_FILE $SRC_FILE_FINISHED
	done
}

while true; do
	if [ "$(ls $DIR | egrep "\.png|\.jpg|\.PNG|\.JPG$" | wc -l)" -gt 0 ]; then
		#echo "$DIR is not Empty"
		convert_all_dir "${@:5}"
	else
		#echo "$DIR is Empty"
		sleep 2
	fi
	sleep 1
done