Re: A notice about \mark when Mark_engraver is moved

[Mats Bengtsson]

On 2017-03-23 10:18,  wrote:
> Hello all!
> I had need of printing marks on several staves, so I moved the
> Mark_engraver to the Staff context, all according to LilyPond NR, see
> snippet below. Then I noticed, that I could not control the contents of
> Rehearsal marks any more, except for the first one. All successors were
> follow in sequence from the start id just as  were they all defined as
> \default. Hence the hash mark has no influence contrary to when the
> Mark_engraver resides in Score. The only possibility to get another id
> is to define it as a text mark.
>
> In the IR manual they say that the Staff_collecting_engraver must be
> moved together with the Mark_engraver so I did, but could see no effect
> from that. I have also tested to move the engraver to the Voice context,
> but with the the same result.
>
> I am running version 2.18.2, and have not tested any newer version.
>
> This is my example:|
>
> |
>
> |\version "2.18.2" A = { \mark #3 a'4 a' | \mark #6 a' a' | \mark
> \markup "Z" a' \mark \default a' | a' } \score { << \new Staff \with {
> \consists "Mark_engraver" \consists "Staff_collecting_engraver" } {
> \time 2/4 \new Voice { \A } } >> \layout { indent = #0 \context { \Score
> \remove "Mark_engraver" \remove "Staff_collecting_engraver" } } }|
>
> ||Result when Mark_engraver is moved
>
> Any experience?
Well, by default, the \mark command is defined as (in 
.../ly/music-functions-init.ly)

mark =
#(define-music-function
   (label) ((number-or-markup?))
  "Make the music for the \\mark command."
  (let* ((set (and (integer? label)
                   (context-spec-music (make-property-set 
'rehearsalMark label)
                                      'Score)))
         (ev (make-music 'MarkEvent
                         'origin (*location*))))

    (if set
        (make-sequential-music (list set ev))
        (begin
          (if label (set! (ly:music-property ev 'label) label))
          ev))))


If you copy this definition into the top of your file and replace 'Score 
by 'Staff, it should behave as you expect.

    /Mats