Re: getopt example please

[Vladimir Panteleev]

On Wednesday, 26 February 2014 at 09:57:19 UTC, Andrew Edwards 
wrote:
Request a small example of how to use getopt to accomplish the 
following:

[1] program subcommand //process subcommand with default 
arguments if any
[2] program -h subcommand //output help information about 
subcommand
[3] program subcommand --option1 --option2 true option3=log.txt 
// process subcommand with user specified options

import std.getopt;

void main(string[] args)
{
    bool help;
    getopt(args,
        "h|help", &help,
        config.stopOnFirstNonOption,
    );

    if (args.length == 1)
    {
        // Print general help and list of commands
        return;
    }

    auto subcommand = args[1];
    switch (subcommand)
    {
        case "subcommand":
        {
            if (help)
            {
                // Print help for subcommand
                return;
            }

            bool option1;
            string option2, option3;
            getopt(args,
                "option1", &option1,
                "option2", &option2,
                "option3", &option3,
            );

            // Process subcommand with specified options

            break;
        }
        default:
            throw new Exception("Unknown subcommand "~ 
subcommand);
    }
}