#!/bin/bash

sep='<nofileevercontainsthis>'
resep='@'

safe_patterns=(
	'.*text.*'
	'(GIF|JPEG|PNG) image data.*'
)
safe_files=("$@")

unsafe_files="$(mktemp)"

find . -type f -exec file -F"$sep" {} + | while read line; do
	file="$(echo "$line"|sed "s${resep}${sep}.*${resep}${resep}")"
	type="$(echo "$line"|sed "s${resep}.*${sep}\s*${resep}${resep}")"
	safe=false
	for filename in "${safe_files[@]}"; do
		if [[ $file = "$filename" ]]; then
			safe=true;
		fi
	done
	for pattern in "${safe_patterns[@]}"; do
		if [[ $type ~= "$pattern" ]]; then
			safe=true;
		fi
	done
	if ! $safe; then
		printf "%s\n" "$file"
	fi
done > "$unsafe_files"

if [[ -n "$(cat "$unsafe_files")" ]]; then
	echo " ==> The source directory `pwd` contains binary files:"
	sed 's/./  ->/' "$unsafe_files"
	rm -f "$unsafe_files"
	exit 1
else
	rm -f "$unsafe_files"
fi