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\parenthesize and optional arguments
From: |
Marc Hohl |
Subject: |
\parenthesize and optional arguments |
Date: |
Sat, 04 Jul 2015 08:34:00 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
Hi list,
my scheme-fu is a bit rusty, so I tried to get a new start
by enhancing the parenthesize function defined in
ly/music-functions-init.ly with the code to be found in
http://lsr.di.unimi.it/LSR/Snippet?id=902
Here is what I have so far:
\version "2.19.20"
parenthesize =
#(define-music-function (dir arg) ((number? 0) ly:music?)
(_i "Tag @var{arg} to be parenthesized. @arg{dir} is optional and may be
set to @code{#LEFT} or @code{#RIGHT} for left/right parentheses only.")
(display dir)
(case dir
((-1) #{ \once\override ParenthesesItem.stencils = #(lambda (grob)
(let ((par-list
(parentheses-item::calc-parenthesis-stencils grob)))
(list (car par-list)
point-stencil ))) #})
((1) #{ \once \override ParenthesesItem.stencils = #(lambda (grob)
(let ((par-list
(parentheses-item::calc-parenthesis-stencils grob)))
(list point-stencil (cadr
par-list)))) #}) )
(if (memq 'event-chord (ly:music-property arg 'types))
;; arg is an EventChord -> set the parenthesize property
;; on all child notes and rests
(for-each
(lambda (ev)
(if (or (memq 'note-event (ly:music-property ev 'types))
(memq 'rest-event (ly:music-property ev 'types)))
(set! (ly:music-property ev 'parenthesize) #t)))
(ly:music-property arg 'elements))
;; No chord, simply set property for this expression:
(set! (ly:music-property arg 'parenthesize) #t))
arg)
{ \parenthesize c \parenthesize #LEFT d \parenthesize #RIGHT e}
It seems as if the \override does not have any effect, though,
but I don't understand why.
Any pointers in the right direction are highly appreciated!
Thanks,
Marc