#!/bin/sh
set -f

errecho() { echo "$*" >&2 ; }
error() { errecho "$*" && exit 1 ; }
TMPDIR="${TMPDIR:-/tmp}"
ed="${VISUAL:-${EDITOR:-vi}}"

clean() {
	[ -f "${tmpfile}" ] && rm -f "$tmpfile"
}

trap 'clean' 1 INT HUP QUIT EXIT

for f; do
	[ -f "$f" ] || { errecho "File $f is not a regular file, is not accessible by the user, or does not exist. Skipping..." && continue; }
	tmpfile="$(mktemp -t doasedit_XXXXXXXX)" || error "Cannot make temp file for $f! Exiting..."
	cp -f "$f" "$tmpfile" || error "Cannot copy file $f! Exiting..."
	errecho "$ed '$f'"
	$ed "$tmpfile" || error "Exit code != 0 by editor. Exiting..."

	cmp "$f" "$tmpfile" >/dev/null 2>&1
	ec=$?
	if [ $ec -eq 1 ]; then
		doas cp "$tmpfile" "$f"
	elif [ $ec -eq 0 ]; then
		errecho "File not changed, skipping..."
	else
		errecho "Problem running diff on $f! Skipping..."
	fi
	rm -f "$tmpfile"
done