Re: Issue 2332 in lilypond: Patch: make-engraver helper macro

[lilypond]

Comment #2 on issue 2332 by address@hidden: Patch: make-engraver  
helper macro
http://code.google.com/p/lilypond/issues/detail?id=2332

Looks great to me (Good to see all the different quoting gone. I have never  
bothered to look up where all the different kinds of quoting are required.  
I simply do a trial-and-error of different quotes until things start  
working).

Hoever, the main issue I'm missing with scheme engravers is that you can't  
assign them a name and consist/remove them by name. In particular, I don't  
know of any way to \remove a scheme engraver from a context once you added  
it (and the cleanup of a score using a custom scheme engraver triggers  
warnings "Warnung: Attempting to remove nonexisting listener." See e.g.  
input/regression/scheme-engraver-instance.ly).