ArgState

pub const ArgState = struct {
    next_arg: usize = 0,
    used_args: ArgSetType = 0,
    args_len: usize,

    pub fn hasUnusedArgs(self: *@This()) bool {
        return @popCount(self.used_args) != self.args_len;
    }

    pub fn nextArg(self: *@This(), arg_index: ?usize) ?usize {
        const next_index = arg_index orelse init: {
            const arg = self.next_arg;
            self.next_arg += 1;
            break :init arg;
        };

        if (next_index >= self.args_len) {
            return null;
        }

        // Mark this argument as used
        self.used_args |= @as(ArgSetType, 1) << @as(u5, @intCast(next_index));
        return next_index;
    }
}