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

[Mike Wey via Digitalmars-d-learn]

On 11-12-17 21:58, Jordi Gutiérrez Hermoso wrote:
but instead, the docstring from getopt is only generated if all 
arguments are valid, i.e. when it's the least needed because the user 
already knew what to input.

What's the proper style, then? Can someone show me a good example of how 
to use getopt and the docstring it automatically generates?


I would use something like this, print the help information for --help, 
print an error for invalid arguments:


```
try
{
        auto helpInformation = getopt(
                args,
                "input|i", "The input", &input,
                "output|o", "The output", &output
        );

        if (helpInformation.helpWanted)
        {
                defaultGetoptPrinter("Description", helpInformation.options);
                exit(0);
        }
}
catch (GetOptException e)
{
        writeln(e.msg);
        exit(1);
}
```

--
Mike Wey