Re: Filters not working

[Charles Berry <ccberry@ucsd.edu>]

Thomas S. Dye <tsd <at> tsdye.com> writes:

> 
> Charles Berry <ccberry <at> ucsd.edu> writes:
> 

[filter to demo extracting back-end name deleted]

> >
> > ,----
> > | type-of back-end: vector
> > | name of back-end: latex
> > `----
> 
> Yes, it does.
> 
> >
> > Take a look at "(defstruct (org-export-backend..." in ox.el
> 
> OK, I had a look at org-export-backend, but not sure what I'm looking
> for in particular.  
> 
> I did note that you don't test back-end directly, but instead look at
> org-export-backend-name. Perhaps this is what Nicolas means by "Filters
> defined here shouldn't make a back-end test, as it may prevent back-ends
> derived from this one to behave properly"?

That comment was in the context of back-end specific filters and aimed at
back-end developers. You are adding to 
org-export-filter-plain-text-functions, which is for users. So, go ahead
and test.


> 
> However, changing my filter so it uses org-export-backend-name doesn't
> seem to change anything.
> 
> Or, was I supposed to learn something else from ox.el?
> 

The changes introduced in commit

  cea0434c4f7f7f1fc1547e6790b96a76bc217e15
  ox: Change back-ends internal representation to structures

necessitate extracting the name of the back-end from a vector.

So, this bit of code 

     (memq backend '(beamer latex)) 

will never return t, because backend is a vector.

Probably what you want is 

     (memq (org-export-backend-name backend) '(latex beamer))


HTH,