Le 02/12/2022 à 23:47, Thomas Morley a écrit :
I know you like pattern matching, though imho it makes things not always easier for users.
Yes, I like pattern matching. No, I'm not going to stop using it :-) Sure, you have to learn it, like every construct, but it improves code clarity IMHO (especially in complex code).
Even for me - I don't understand that (x x)-line:
\override Arpeggio.positions =
#(grob-transformer
'positions
(lambda (grob original)
(match original
((a . b) (cons (- a 5.0) (+ b 5.0)))
(x x)))) ;; <==
This was me being too lazy to look up whether original might be something other than a pair, like #f, '() or *unspecified*, especially if the grob suicided itself inside the positions callback. In such a case, this code would have returned original unchanged, as (if (pair? original) (cons (- (car original) 5.0) (+ (cdr original) 5.0)) original) This case appears not to occur, though, so that precaution was unnecessary. Best, Jean
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