extractValueForFlag

string[] args = "app -a value1 value2 -b parameter --nothing".split;
assert("parameter" == args.getOptionValue("-b"));
assert("value1" == args.getOptionValue("-a"));
assert("" == args.getOptionValue("--nothing"));

assert(args == "app -a value1 value2 -b parameter --nothing".split);

assert("parameter" == args.extractValueForFlag("-b"));
assert("app -a value1 value2 --nothing".split == args);
assert("value1" == args.extractValueForFlag("-a"));
assert("app value2 --nothing".split == args);

args = "-a value1 value2 -b parameter --nothing".split;
assert("parameter" == args.getOptionValue("-b"));
assert("value1" == args.getOptionValue("-a"));
assert("" == args.getOptionValue("--nothing"));
assert("parameter" == args.extractValueForFlag("-b"));
assert("-a value1 value2 --nothing".split == args);
assert("value1" == args.extractValueForFlag("-a"));
assert("value2 --nothing".split == args);

args = `build --file=/home/user/Project_1/Makefile`.split;
assert("/home/user/Project_1/Makefile" == args.getOptionValue("--file"));