Re: Pull in external LilyPond files into a score of movements

[unlabeled]

    Thanks so much, Jérôme! I think I understand the syntax there, but I
    can't actually get it to work. I will try to explain, now that I
    have more time, exactly what I am attempting. 
    
    I am working on a multi-movement orchestral score. I want to be able
    to print a final score using bookparts, but while I work on each
    movement, I want to render it in isolation. I don't expect to
    publish the separate movements, so I don't care if they are perfect,
    but I need them to play and render as I am working. I will
    eventually need to make parts too, but at the moment I'm not
    thinking that far ahead. 
    
    So, here is my file structure: 
    
    FullScore.ly - this contains \version and \paper, and then it
    defines variables title, composer, etc. Then, it includes the first
    movement's .ly; then it resets title, composer, etc. to \null so
    that they won't be repeated on each movement. 
    
    Now, each movement is an .ly file too, e.g. movtI.ly - in this, I
    set movtTitle, I set global key, time, and tempo, and a var for
    midiTempo. Then I set each instrument's music as a music block, e.g.
    
    scoreAFlute = \relative c'' {
      \global
        ...
    }
    
    Finally, at the end of the movt. file I include "score_def.ly"
    
    score_def.ly is a single file, having info that is shared for every
    movement. It defines instruments and assigns the previously set
    music to them, e.g. 
    scoreAFlutePart = \new Staff \with {
      instrumentName = "Flute"
      shortInstrumentName = "Fl."
      midiInstrument = "flute"
    } \scoreAFlute
    
    Then it sets a \bookpart, which contains a \header and two \scores -
    one for display rendering, and one for midi rendering (uses
    articulate.ly)
    
    This is where I am having the problem - I say it's all the same for
    every file, but the one thing that is different is that the header
    elements are unique - those are delivered as variables in the
    \header block. This is fine, in the structure as above, when I
    render the full score. But if I try to render a single movement, the
    variables are not defined, so I get an error. That's why I was
    hoping to either a) set the variable in the movt.ly file, like title
    = \title || "", or b) do that right in the score_def, so that in the
    header I could just do title = \title || "", So I tried your
    solution, and I keep getting an error - I've tried putting it in
    various places, and changing the syntax every way I can think of,
    but it's always an error.  
    
    Of course, I AM AN IDIOT - I just moved the variables from the
    fullscore into each movt.ly file, and set them all to "" except the
    first movt., and I get exactly what I want. So, no real problem - I
    just was not thinking clearly before I guess. BUT, I would still
    love to find out how to do this, as I know it will come up again in
    some other context. 
    
    At any rate, thanks again for trying to help - I really appreciate
    it!

On 8/4/2015 8:23 AM, Jérôme Plût-2 [via Lilypond] wrote:

Pridie Nonas Augustas MMXV scripsit unlabeled :

> Thank you all so much, i'm just getting into lilypond and trying to figure
> out how to make it work for my workflow. i have a solution i like to this,
> or similar, issue, which i will share soon. meanwhile, i have a question
> that will help me finish it:
> is there such a thing as a null0if, or a ternary operator that can be used
> inline? I want to do something like this:
>
> \header {
>     title = \title
>   }
>
> but if \title hasn't been defined (because I'm running an ily outside its
> container), then it fails. Would like to do something like title = \title ||
> "" (to borrow _javascript_ syntax - use \title var if it exists, else use an
> empty string).
>
> I guess if not, I can write a scheme function, but haven't delved into that
> yet, and trying to figure out the simplest approach.

I think the easiest way is to scheme it:
(warning, I cannot test the code below right now):

#(if (not (defined? 'title)) (set! title ""))

You can even meta-scheme it:

#(define (define-default symbol)
  (if (not (defined? symbol)) (module-add! (current-module) symbol "")))

#(map define-default '(title subtitle instrument composer))


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