Thomas Morley <thomasmorle...@gmail.com> writes:
> Hi,
>
> the code below
>
> \layout { \context { \Voice \consists "Balloon_engraver" } }
> { c'-\balloonText #'(2 . 0) \markup { "1" } }
>
> returns (in 2.21.0):
> ERROR: In procedure symbol->string:
> ERROR: Wrong type argument in position 1 (expecting symbol): ()
>
> 2.18.2 gives a more useful message:
> /home/hermann/lilypond/usr/share/lilypond/current/scm/lily-library.scm:242:8:
> In procedure symbol->string in expression (process-procedure book
> paper ...):
> /home/hermann/lilypond/usr/share/lilypond/current/scm/lily-library.scm:242:8:
> Wrong type argument in position 1 (expecting symbol): ()
>
> Though, I've no clue where symbol->string comes into the game...
In lily/balloon-engraver.cc
> Ofcourse the NR recommends to use balloonText _inside_ of chords, and
> indeed the problem goes away, wrapping the note in an event-chord.
> But shouldn't it work as a postevent to a single note, too??
The implementation does not work with separate AnnotateOutput events
(more exactly, they require specifying the particular grob type to use
since usually a number of grobs could be annotated). One could try to
capture all rhythmic-events and annotate them all. It's all reasonably
icky stuff that should at one point of time be upgraded to look like
what we do with footnotes. As a stopgap measure, one could use the
following patch for a bit nicer behavior.
>From 90aaea796acefa5bf294c6d5ed473b1168307019 Mon Sep 17 00:00:00 2001
From: David Kastrup <d...@gnu.org>
Date: Sat, 28 Sep 2019 21:52:11 +0200
Subject: [PATCH] Warn about \balloonText outside of chords
---
lily/balloon-engraver.cc | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/lily/balloon-engraver.cc b/lily/balloon-engraver.cc
index 23be7406a5..86de83f4f9 100644
--- a/lily/balloon-engraver.cc
+++ b/lily/balloon-engraver.cc
@@ -18,7 +18,7 @@
*/
#include "engraver.hh"
-
+#include "international.hh"
#include "stream-event.hh"
#include "item.hh"
@@ -40,6 +40,11 @@ class Balloon_engraver : public Engraver
void
Balloon_engraver::listen_annotate_output (Stream_event *ev)
{
+ if (!scm_is_symbol (ev->get_property ("symbol")))
+ {
+ ev->origin ()->warning (_ ("\\balloonText can only be used inside of chords"));
+ return;
+ }
events_.push_back (ev);
}
--
2.20.1
--
David Kastrup
_______________________________________________
bug-lilypond mailing list
bug-lilypond@gnu.org
https://lists.gnu.org/mailman/listinfo/bug-lilypond
