#!/bin/sh
# NOTE: tifftopnm is a part of netpbm package

usage() {
	echo "Usage: $0 [--delete]"
	echo
	echo "This script checks if TIFF files in the current directory are valid and prints invalid ones."
	echo
	echo "Options:"
	echo "  --delete   Delete invalid TIFF files."
	echo "  --help     Display this help message."
}

DELETE_FILES=false
for arg in "$@"; do
	case $arg in
		--delete)
			DELETE_FILES=true
			;;
		--help)
			usage
			exit 0
			;;
		*)
			echo "Unknown argument: $arg" >&2
			usage >&2
			exit 1
			;;
	esac
done

for f in *.tif; do
	echo -n "$f... "
	tifftopnm "$f" 2>&1 >/dev/null | grep -i error >/dev/null && {
		if [ "$DELETE_FILES" = true ]; then
			rm "$f"
			echo -n "DELETED"
		else
			echo -n "ERROR"
		fi
	}
	echo 
done