Help Required on Getopt

[Jon Degenhardt via Digitalmars-d-learn]

On Friday, 1 September 2017 at 13:13:39 UTC, Vino.B wrote:
> Hi All,
>
>   When i run the below program without any arguments "D1.d -r" 
> it is throwing error, but i need it to show the help menu
>
> [snip...]

Hi Vino,

To get good error message behavior you need to put the construct 
in a try-catch block. Then you can choose how to respond. An 
example here: 
https://github.com/eBay/tsv-utils-dlang/blob/master/tsv-append/src/tsv-append.d#L138-L194. This code prints outs the error message from the exception. In your case: "Missing value for argument -r.". But, you could also print out the help text as well. There is an example of that as well in the above code block, look for the 'if (r.helpWanted)' test.

--Jon