Determining requested output files

[Fr. Samuel Springuel]

I have the following scheme function which I used on versions 2.22 and earlier 
which determined the requested output files for a lilypond run:

#(define target-extensions (cond ((equal? (ly:get-option 'backend) 'svg) (list 
"svg"))
                                 ((equal? (ly:get-option 'backend) 'scm) (list 
"scm"))
                                 ((equal? (ly:get-option 'backend) 'ps) 
(uniq-list (sort-list (ly:output-formats) string<?)))
                                 ((equal? (ly:get-option 'backend) 'eps) (map 
(lambda (str) (if (equal? str "ps") "eps" str)) (uniq-list (sort-list 
(ly:output-formats) string<?))))
                                 (else '())))

Now, I realize that the list of possible backends has changed (from ps, eps, 
null, scm, and svg to ps, cairo, and svg) so I have to make some adjustments 
there, but the ps and cairo backends both can produce multiple different types 
of files.  For the old ps backend, what was requested used to be available in 
ly:output-formats, but this function has been removed (commit bf3af63b seems to 
be the culprit).  I’m having trouble, however, figuring out where the 
information has migrated to (I assume it still has to be stored somewhere).  
Can anyone provide some additional clarity here?

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Fr. Samuel, OSB
(R. Padraic Springuel)
St. Anselm’s Abbey
4501 South Dakota Ave, NE
Washington, DC, 20017
202-269-2300
(c) 202-853-7036

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