getopt usage help to stderr?

[kdevel]

On Wednesday, 9 April 2025 at 01:23:01 UTC, Salih Dincer wrote:
> On Tuesday, 8 April 2025 at 20:14:56 UTC, Andy Valencia wrote:
>>
>> p.s. Ironically, I could probably have coded a getopt in less 
>> time than I've spent on std.getopt...
>
> :)
>
> Please try the following example with the parameters -h, -e, 
> -l, and -v in that order:

-h prints what one expects. If help is wanted I expect the usage 
info be written on stdout though. Nothing bothers more than 
programs with multiple  pages of usage help written you cannot 
pipe cleanly to less.

-e says "-h --help This help information" which is not really 
true, since "This" help information is the help information of 
the empty list of the second getopt call in line 37 of your code 
and not the help for the original list.

-l crashes with a stack trace after getopt threw in line 37 
(Unrecognized option -l). This crash happens because -l is not 
removed from args.

-v does as expected.

That your program prints what it prints in the -e case is due to 
the fact that in the second getopt call (line 37) the -e flag has 
already been removed from the original args array. If you put the 
throw block into a function (clean code) that mechanism no longer 
works.

my 2¢