Sun, 30 Nov 2003 11:24:53 -0700, Paul a dit :
> Guy Shaviv wrote:
>> That's correct, I'm interested in how you can set up a command that takes a
>> parameter. I actually even need two parameters as a partial barre has two
>> parameters, on what fret and on how many strings. While for the full barre I
>> can setup 12 commands (e.g. \barreI \barreII ...), its impractical to setup
>> all the permutations for the partial barre, that would take 60 commands).
>>
> I am trying to solve the same problem. I have gotten this far:
> #(define textPad( lambda( pad ) \property Score.TextScript \override
> #'padding = pad ))
> with several guessed variations of
> (textPad 3)
> Can someone help me finish the syntax?
In the following snippet, functions nthcdr and group are general
utilities. Macros mus:make-music and mus:context-override are
part of a LilyPond-specific toolkit. Function text-pad finally does
what you may want: it takes the padding value as a mandatory argument,
and a second optional argument which, if true, means that the property
override will happen only once. An example shows some variations of
its use.
---------------- toto.ly ------------------------
#(use-modules (ice-9 optargs))
#(define-public (nthcdr n source)
(do ((rest source (if (pair? rest) (cdr rest)))
(i 0 (1+ i)))
((= i n) rest)))
#(define-public (group source n)
(if (zero? n) (error "zero length"))
(letrec ((rec (lambda (source acc)
(let ((rest (nthcdr n source)))
(if (pair? rest)
(rec rest (cons (list-head source n) acc))
(reverse! (cons source acc)))))))
(if (null? source) '() (rec source '()))))
#(defmacro*-public mus:make-music (name #:rest props)
"Make a music expression, of type `name' (a non quoted symbol).
`props' describe the music expression properties. For isntance:
(mus:make-music PropertySet
symbol 'autoBeaming
value #f)"
(let ((prop-clauses (group props 2))
(gmus (gensym)))
`(let ((,gmus (make-music-by-name ',name)))
,@(map (lambda (clause)
`(ly:set-mus-property! ,gmus ',(car clause)
,(cadr clause)))
prop-clauses)
,gmus)))
#(defmacro*-public mus:context-override (context property setting
value #:key (once #f))
"Make a ContextSpeccedMusic with OverrideProperty element, similar
to:
[\\once] \\property context.property \override #'setting = #value"
`(context-spec-music
(mus:make-music OverrideProperty
once ,once
symbol ',property
grob-property ',setting
grob-value ,value)
',context))
#(define*-public (text-pad pad #:optional once)
(ly:export (mus:context-override Voice TextScript padding pad
#:once once)))
\score { \notes { c'^"salut" c' #(text-pad 3.0 #t) c'^"salut"
c'^"salut" c' #(text-pad 3.0) c'^"salut" c'^"salut" }}
---------------- toto.ly ------------------------
You might take a look at
http://nicolas.sceaux.free.fr/schemingly/scheme-hacks.html
where you will find few other utilities of that kind, that may help
you build other functions for LilyPond. Lily 2.0 is required.
Best regards,
Nicolas
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