[Ayttm-devel] spell check, links, smileys, etc

[Philip S Tellis]

IMO, all of these can best be implemented as filters.  We use concepts 
from functional programming to do it:

Text -> filter1 -> filter2 -> filter3 .... -> filtered text

Each filter will take a const char * and return a char * - a newly 
malloc'ed char *.  The original text will not be modified or free'd.

We already have a filter walk system, but the filters are inconsistent 
in whether they free the in text or not.  Our filter walker should be 
the one that frees the in text after exiting from a filter.

Ideally I'd have liked to do it like this:

text = filter3(filter2(filter1(in_text))), but that would require us to 
know all the filters in advance.

Currently spell check, linkinfy and smileys are implemented in the core.  
I vote to move them out into filter modules.

All in favour start coding ;)

Philip