Re: Re: Re: conditional formatting

[Marten Visser]

At 11:08 05/10/2010, you wrote:
> On Mon 04 Oct 2010, 23:11 Marten Visser wrote:
> > Dmytro's suggestion looks more promising, though I haven't been able
> > to generate code that does the job so far. When I code
> >
> > ==================
> > \new Devnull
> > <<
> >         \TablatureNotes
> > >>
> > ==================
> >
> > I still get an empty tabStaff and two tabstaffs below it for both
> > voices in the \TablatureNotes. Replacing "Devnull" by "TabStaff", I
> > get one tabstaff with both voices combined. I guess Devnull is not a
> > manner to suppress printing the staff.
>
> Sorry, i've not tested this much.
>
> Which lilypond version do you use? That sample was tested (a bit,-) with
> 2.13.35, latest development so far. Well.. this works with 2.12 too, ive tried
> just now.
>
> First of all -- i'm not sure that this is the best (or even smart at all) way
> to do "this" (and i am still not sure that i understood what's needed,-)
>
> Anyway, please take a look -- this example produces ChoirStaff with two staves
> if makeFor equals 'choir and produces single staff with \lowerMelody if
> makeFor equals anything else.
>
> How far this from a required result?
>
> %--------------8<-----------------------
> makeFor = #'choir
>
> #(define myContainer (if (eq? makeFor 'choir)
>                          "ChoirStaff"
>                          "Devnull"))
>
> #(define upperStaff (if (eq? makeFor 'choir)
>                         "Staff"
>                         "Devnull"))
>
> upperMelody = \relative c'' {
>   c4 bes d c
> }
>
> lowerMelody = \relative c'' {
>   a4 g bes a
> }
>
> \score {
>   \new \myContainer <<
>     \new \upperStaff <<
>       \upperMelody
>     >>
>     \new Staff {
>       \lowerMelody
>     }
>   >>
> }
> %--------------8<-----------------------
>
> I'm just interesting .-)
>
> Playing with lilypond gives me a lot of fun and some experience, which can be
> used later, for my own needs.
>
> Or, if this is more convenient for you, could you post a small example ---
> what you've tried and it wasn't work as desired?
>
> Thanks.
>
> --
>   Dmytro O. Redchuk
>   Bug Squad

Hello again,

I compiled your example, but it didn't compile without errors. I did 
get the results you got, however.

I changed your code to obtain what I expected your code to produce:

======================
%{
        Example of variable stafftype with scheme funtions
%}

\version "2.13.32"

makeFor = #'piano
%makeFor = #'choir

%#(define myContainer (if (eq? makeFor 'choir)
%                         "ChoirStaff"
%                         "Devnull"))
myContainer =
        #(if (eq? makeFor 'choir) "ChoirStaff" "PianoStaff")

%#(define upperStaff (if (eq? makeFor 'choir)
%                        "Staff"
%                        "Devnull"))
upperStaff =
        #(if (eq? makeFor 'choir) "Staff" "Devnull")

upperMelody = \relative c'' {
  c4 bes d c
}

lowerMelody = \relative c'' {
  a4 g bes a
}

\score {
  \new \myContainer <<
    \new \upperStaff
    {
        \set Staff.instrumentName = \myContainer
        <<
      \upperMelody
        >>
        }
    \new Staff {
      \lowerMelody
    }
  >>
}
======================

By setting the instrumentName to \myContainer I checked what was 
actually happening. In your example an unrecoverable error occurred. 
The above example is bug-free in the \version used.

I'll try to work this to a code for omitting the tablature staff, and 
post it here.

--Marten