Hi all,
earlier this day, Roland did ask me (per PM) a question leading to an
IMHO very usable little helper.
Ronald wanted some feature like the following:
- At top level, define
textshift = \once\override TextScript #'extra-offset = #'(#1 . #2)
- Within music expressions, use
\textshift{0}{-1.5}
Since that isn't possible in LilyPond, I searched the documentation and
the LilyPond sources some minutes, found ly:context-pushpop-property
and an example of it in wilhelmus.ly.
After a first quick hack I sent to Roland, I tried the following refined
(yet not working) solution:
% Helper for single context-overrides.
#(define (single-context-override context-name property-name)
(lambda (value)
(lambda (context)
(ly:context-pushpop-property context context-name property-name value)
)
)
)
That function can be used for defining context-overriding functions. For
example (to use Rolands use case):
#(define textshift (single-context-override 'TextScript 'extra-offset))
That can be used in the music expressions by
\applycontext #(textshift '(0 . -1.5))
Unfortunately, that doesn't imply the semantic of \once. There seems to
be an internal *music* property named 'once', but I've no idea wether
or how that can be used here.
Has anyone an idea of how to get the property really set *once*?
Ciao,
Kili
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