#!/bin/sh
# inplace iconv wrapper
#
# (c) Michael Shigorin <mike@altlinux.org>, 2022
# GPLv2 with ukronazi exception: those supporting them better hide

tmpfile="$(mktemp)"
atexit() { rm -f "$tmpfile"; }
trap atexit HUP INT QUIT

args=
file=

for i in "$@"; do
	case "$i" in
	-l|--list|-\?|--help|--usage|-V|--version)
		exec iconv "$i";;
	-s|--silent)
		shift
		;;
	-f|-t)
		shift
		args="$args $i $1"
		shift
		;;
	-f*|-t*|--f*|--t*|-c)
		args="$args $i"
		shift
		;;
	-o|-*)
		echo "$0: unsupported option \`$i'" >&2
		exit 1
		;;
	*)
		file="$1"
		break
		;;
	esac
done

[ -f "$file" ] || {
	echo "$0: $file does not exist" >&2
	exit 2
}

iconv $args < "$file" > "$tmpfile" &&
touch -r "$file" "$tmpfile" &&
mv "$tmpfile" "$file"