Re: Quick question: how to do .index in groff?

[Denis M. Wilson]

Sorry, the macros I've written are .strchr and .strrchr.

.index should not be too hard using direct method (KMP is too
complicated). I may have time to try, no promises...

On Sat, 25 Jul 2020 17:42:17 -0700strrchr
B 9 <hackerb9@member.fsf.org> wrote:

> "Denis M. Wilson" <dmw@oxytropis.plus.com> wrote:
> 
> > To implement .index as a macro one could consider using .substring
> > together with the Knuth-Morris-Pratt algorithm. I've done simpler
> > things eg the equivalent of The C library substr().  
> 
> Thank you. Would you be willing to share your strstr() macro?
> 
> I'm surprised nobody has implemented Heirloom Troff's .index, but I
> guess that's an indication I'm thinking about things in the wrong way.
> There's probably some other, more natural solution in groff.
> 
> By the way, is it a goal of groff to support the Heirloom Troff
> extensions? There are some nice ideas I wouldn't mind seeing in groff,
> like the \W escape and using standard system fonts. 
> 
> —b9
> 


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