[Toybox] About supporting long(--) option

[Rob Landley]

On 04/29/2013 01:17:46 AM, Kyungwan Han wrote:
> Hello all,
> 
> I have a question about treating long(--) option in toybox.
> 
> There are two style options - short(-) and long(--) - in linux system.
> (
> http://unix.stackexchange.com/questions/21852/single-dashes-for-single-character-options-but-double-dashes-for-words
> )
> 
> I know toybox supports only short option, so toybox cannot treat  
> '--help'
> option.
> 
> Is there special reason for not supporting long option?

It does support --longopts, it's just not hugely tested at the moment.

See http://landley.net/toybox/code.html#lib_args and scroll down to  
"--longopts".

Long options that alias a short option should work now, just put  
(longoptname) after your short option in the option string. You can  
even have multiple aliases, ala:

   "abc(longforc)(anotherlongforc)#def"

Then "-c42" "--longforc 42" and "--anotherlongforc=42" should all work  
the same way. (And yes, the option parsing should understand all those  
variants, let me know if it doesn't so I can fix it.)

The design also supports bare longopts (long options which aren't an  
alias for a short option) by simply listing them first in the option  
string, before any short option to attach to. Unfortunately there's a  
bug in lib/args.c (they all get this same bit value, when each should  
get a unique bit value), and the header generation logic isn't creating  
FLAG_longoptname macros yet so at the moment you can only check for the  
ones that alias to a short option you get a macro for.

I need to fix that...

Rob