chic

#!/bin/sh

me=$(basename "$0")
base=$(dirname "$(realpath "$0")")

err() { printf '%s: error: %s\n' "$me" "$*" >&2; exit 1; }
warn() { printf '%s: warning: %s\n' "$me" "$*" >&2; }

usage() {
	printf 'usage: %s [-b] [file.chi] [-o file.out]\n' "$me" >&2
	exit 1
}

build=0
in=/dev/stdin

while [ "$1" ]; do
	case $1 in
	-h)
		usage
		;;
	-b)
		build=1
		;;
	-o)
		shift
		[ "$1" ] || usage
		[ -f "$1" ] || warn "file already exists: $1"
		out=$1
		;;
	*)
		[ -f "$1" ] || err "not a file: $1"
		in=$1
		;;
	esac
	shift
done

if ! [ "$out" ]; then
	if [ "$in" = '/dev/stdin' ]; then
		out=/dev/stdout
		if [ $build -gt 0 ]; then
			warn 'cannot build when reading stdin'
			build=0
		fi
	else
		out=${in%.chi}.c0
	fi
fi

if [ $build -eq 0 ]; then
	"$base"/gen < "$in" > "$out"
else
	"$base"/gen < "$in" > "$out" &&
		cc -Wno-undefined-internal -x c "$out" -o "${out%.c0}"
fi