On Tue, 26 Jun 2018 at 12:03, David Kastrup <[email protected]> wrote:
> Gianmaria Lari <[email protected]> writes:
>
> > On Tue, 26 Jun 2018 at 10:47, David Kastrup <[email protected]> wrote:
> >
> >> Gianmaria Lari <[email protected]> writes:
> >>
> >> > For this I thought to write a substitution function etc. Something
> like
> >> > this (it doesn't compile):
> >> >
> >> > \version "2.19.81"
> >> > myScore =
> >> > #(define-void-function (music) (ly:music?)
> >> > (let (myRests #{ \time 3/4 r4 r r #} ) (ticktock #{ \time 3/4 hihat
> >> > bassdrum bassdrum #}))
> >> > #{
> >> > \score {
> >> > <<
> >> > \new Staff {\myRests $music}
> >> > \new DrumStaff { \ticktock}
> >> > >>
> >> > \layout{} \midi{} } #})
> >> >
> >> > music = {\time 3/4 a b c'}
> >> >
> >> > \myScore \music
> >> >
> >> > The "let" part is not correct. I don't know how to define variable
> >> > containing lilypond code using let.
> >>
> >> How about copy&paste from working code then?
> >>
> >> The first argument of "let" is a list (parenthesized) of variable
> >> bindings. Each binding has the form (var value) so in general let
> >> _alyways_ starts (the exception being named let, but that's a different
> >> beast)
> >>
> >> (let ((
> >>
> >> and you are missing the second paren. Copying or imitating _any_
> >> working let would have worked here.
> >>
> >
> > My apologies David and thank you for your help.
> > But I also wanted to know if the direction I have taken was correct or
> > completely wrong....
>
> Well, it's a void function you use here, not a scheme function. Once it
> works, it will create a score and throw it away.
Oh, you're right! So here it is the code where I fixed the function issue.
It compiles.
\version "2.19.82"
#(define myRests #{ \time 3/4 r4 r r #} )
#(define ticktock #{ \drummode {\time 3/4 hihat4 bassdrum bassdrum} #} )
myScore =
#(define-scheme-function (music) (ly:music?)
#{
\score {
<<
\new Staff {\myRests $music }
\new DrumStaff { \ticktock}
>>
\layout{} \midi{} } #})
music = {\time 3/4 a b c'}
\myScore \music
Now in the following example I tried to put myRests and ticktock inside
myScore. Because I know I could, I tried using nested define. It works ok.
\version "2.19.82"
myScore =
#(define-scheme-function (music) (ly:music?)
(define myRests #{ \time 3/4 r4 r r #} )
(define ticktock #{ \drummode {\time 3/4 hihat4 bassdrum bassdrum} #} )
#{
\score {
<<
\new Staff { $myRests $music }
\new DrumStaff { $ticktock }
>>
\layout{} \midi{} } #})
music = {\time 3/4 a b c'}
\myScore \music
And finally with let. It works ok.
\version "2.19.82"
myScore =
#(define-scheme-function (music) (ly:music?)
(let ((myRests #{ \time 3/4 r4 r r #} )
(ticktock #{ \drummode {\time 3/4 hihat4 bassdrum bassdrum} #} ))
#{
\score {
<<
\new Staff { $myRests $music }
\new DrumStaff { $ticktock }
>>
\layout{} \midi{} } #}))
music = {\time 3/4 a b c'}
\myScore \music
I have to say I have not been able to make it working until few minutes
ago. I was using let similarly to the nested define. I was closing the
parenthese of let command.... like this:
(define-scheme-function .....
(let ..... )
( .... body of define ..... )
That way the scope of the variable defined with let was not available
inside the body of define.
Thank you for the help!
Now I will try to generate myRests and ticktock automatically according
time defined in $music.
g.
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