#!/bin/sh

# Edit a file that requires superuser permissions without running the editor as root
# Substitute for sudo -e that uses doas instead.

set -e

if [ -z $1 ]
then
	exit
fi

DNAME=$(mktemp -d)
FNAME=$(basename $1)
FPATH="$DNAME/$FNAME"

if [ -e $1 ]
then
	cp "$1" "$FPATH"
else
	touch "$FPATH"
fi

$EDITOR "$FPATH"

DIFF=""

if [ ! -e $FPATH ]
then
	exit
fi

if [ -e $1 ]
then
	DIFF=$(diff "$FPATH" "$1")
else
	DIFF=$(cat "$FPATH")
fi

if [ -n "$DIFF" ]
then
	doas cp "$FPATH" "$1"
fi

rm "$FPATH"
rmdir $DNAME