Hi,
On Mon, Apr 27, 2015 at 9:44 AM, Urs Liska <u...@openlilylib.org> wrote:
>
>
> Am 27.04.2015 um 16:27 schrieb Noeck:
>
>> Dear all, dear Urs,
>>
>> I would like to color tweaks of a particular edition of the edition
>> engraver. I know that there is a checkbox in Frescobaldi to color, so it
>> seems possible to color tweaked grobs in general.
>>
>
> No, I don't think this is possible, although I would really like to have
> that feature (to immediately make visible what is "original" and what is
> "manual").
>
> What we have in Frescobaldi depends on what we can "catch" by either
> listening through engravers or by redefining command. So far I haven't
> found a notion of a grob knowing if it has been tweaked or not.
>
Here's a code snippet to show that it is possible to tell if a grob has
been altered. Right now you have to add the procedure for each grob you
want to examine.
\version "2.19.17"
#(define (mark-tweak grob)
(let* ((default (assoc-get (grob::name grob) all-grob-descriptions))
(props (ly:grob-basic-properties grob))
;; Our procedure has been added to the head of grob's basic
;; properties. Let's not count it as a tweak!
(props
(remove
(lambda (p)
(and (procedure? (cdr p))
(eq? (procedure-name (cdr p)) 'mark-tweak)))
props))
(diff (lset-difference eq? props default)))
;; Tweaks will not appear in the "basic properties" alist of our grob,
but
;; we can find them through the music event which led to the grob.
This
;; is (currently) available through the stream-event which caused our
grob.
(if (null? diff)
(let* ((cause (event-cause grob))
(tweaks (and cause
(ly:music-property
(ly:event-property cause 'music-cause)
'tweaks))))
(if (pair? tweaks)
(set! (ly:grob-property grob 'color) red)))
(set! (ly:grob-property grob 'color) green))))
{
\override NoteHead.after-line-breaking = #mark-tweak
c'
\once \override NoteHead.font-size = 3
c'
c'
\tweak font-size 3 c'
c'
\override Slur.after-line-breaking = #mark-tweak
c'( e')
\shape #'((0 . 0) (0 . -0.5) (0 . -0.5) (0 . 0)) Slur
c'( e')
}
%%%
Hope this is helpful.
David
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