Hello Urs,
On 10.05.2012 12:40, Urs Liska wrote:
Hi David,
thank you for the reply
Am 10.05.2012 12:05, schrieb David Kastrup:
Urs Liska<[email protected]> writes:
So now the question:
How can I write a function that produces a toplevel expression?
No such thing.
:-(
an _ugly_ way is to produce a string and then use
#(ly:parser-include-string parser topLevelString)
This snip can then be included in a music- or scheme-function to be used
in lily-syntax. There are cases, where I use this construct, but I try
to avoid it.
...
OK, instead of
\debugCurvesOn
I now have to insert
\layout { \debutCurvesOn }
in my main file.
It is not perfectly what I had hoped for, but it's fine nevertheless
(definitely better than the current solution).
So we may consider this as solved.
If you want to turn this into a function, you use define-scheme-function
and construct the return value using #{ \layout { ... } #}.
Not necessary anymore. But I think I see now better how this works.
Furthermore I will later want to write functions for the \score block,
and I will want to pass some parameters in there - which doesn't work
with include files.
Not clear to me what you want.
I wanted to be able to write
\liedScore "Stimme" "Klavier"
or
\liedScore "Voice" "Piano"
and get back the respective \score block with the parameters substituted.
you can write
liedScore = \score { ... }
and you can write
liedScore = #(define-scheme-function (parser layout ...)(...)
#{
\score {
...
}
#})
... thanks to Davids remarkable parser refinements. (I was not amused in
the first place, rewriting/updating my scores accordingly, but IMO these
changes are a major step forward for lilypond!)
If you reference this, it looks all the same
\liedScore /optional parms/
But from your answers to the other part of the question I now know
that this isn't possible.
If liedScore is a music-function (returning void), it can be placed
anywhere. This function can do anything possible in scheme: It can add
scores or markups to the current stream:
--snip--
fun = #(define-music-function (parser location mus)(ly:music?)
(add-score parser (list #{ \markup { Hello World } #}))
(add-score parser #{ \score { $mus } #})
(make-music 'SequentialMusic 'void #t))
\fun \relative c' { c4 e g b }
--snip--
Now you can put anything in your function, to create the score.
Probably I'll look for a solution through defining a variable and then
including the file with the \score definition.
For the project at hand it's not necessary because I can have the
score block be hardcoded. But I want to distill a more generic
library/framework for use after this project.
Using lilypond is handcraft and the artist often wishes to have his own
unique tool ;-)
I also use my own functions:
http://www.xn--schne-noten-tfb.de/?tabs=3,1
http://www.xn--schne-noten-tfb.de/lalily.tgz
It is poorly to not documented, but if you are interested, I can give
you more information.
Cheers, Jan-Peter
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