use encoding::hex;
use fmt;
use os;
use strings;
use unicode;

export fn main() void = {
	const input = os::args[1];
	const data = strings::toutf8(input);
	hex::dump(os::stdout, data)!;

	fmt::println(input)!;

	let ix = 0u;
	const lb = unicode::new_line_breaker(input);
	for (const (pos, _, mand) => unicode::next_line_break(&lb)) {
		for (ix < pos; ix += 1) {
			fmt::print(' ')!;
		};
		ix += 1;

		if (mand) {
			fmt::println('|')!;
		} else {
			fmt::print('^')!;
		};
	};

	fmt::println()!;
	fmt::println()!;

	fmt::println("Line break opportunities:")!;
	const lb = unicode::new_line_breaker(input);
	for (const (pos, bpos, mand) => unicode::next_line_break(&lb)) {
		fmt::printfln("- {}:{} {} (before '{}'/0x{:x})", pos, bpos,
			if (mand) "(mandatory)" else "",
			strings::sub(input, pos, pos+1),
			data[bpos])!;
	};
};