Re: What's the proper way to use std.getopt?

[Adam D. Ruppe via Digitalmars-d-learn]

On Monday, 11 December 2017 at 20:58:25 UTC, Jordi Gutiérrez 
Hermoso wrote:
I don't quite understand what to do if getopt throws. I would 
have hoped for something like

I might have already said this to you on IRC but the way I'd do 
it (if you must do this) is:

void main(string[] args) {
    int arg1;
    string arg2;

    bool getoptions(string[] args) {
       auto result = getopt(args, "opt1", "docstring 1", &arg1, 
"opt2", "docstring 2", &arg2);
       if(result.helpWanted)
         defaultGetoptPrinter("Some information about the 
program.", result.options);
       return result.helpWanted;
    }

    try {
       if(getoptions(args))
            return; // it just printed help
    } catch(GetOptException e) {
       writeln(e.msg);
       getoptions(["--help"]);
       return;
    }

    /* rest of your program */
}



Even though, I think printing the whole help output on any 
exception is likely to be fairly annoying since it obscures the 
actual error message.