cleanly dealing with variables and reducing code duplication in multimovement works

[Shevek]

Hello,

I'm working on a multi-movement piece, so far using a separate file for the
score of each movement. I'm trying to add a file to the project that
compiles all the movements and frontmatter into a single pdf, using
bookparts, and I'm having trouble figuring out the best way to do that. The
nicest way would be if all I needed to do were:

\book {
  \bookpart {
    \include "movement1_score.ly"
  }
  \bookpart {
    \include "movement2_score.ly"
  }
}

As you might guess, that fails because each of the included files itself
includes a file (e.g. movement1_music.ly) containing variable declarations,
and variable declarations aren't allowed inside bookparts. The solution to
that problem is for me to include movement1_music.ly etc. outside the \book
block. That causes another problem, though, because I am using the same
variable naming scheme for each of the movements. Obviously, I could solve
that problem by adding a prefix to all the variable names, but that seems
really yucky to me. I find myself craving some way to reference same-named
variables in different namespaces, like movement1.flute versus
movement2.flute.

Related to that craving is the fact that the score blocks for each of the
movements are identical, which makes me feel like there ought to be some way
to get rid of that code duplication. Really, I want to define the structure
of the score block once, and then instantiate it multiple times, feeding
each instance a different namespace, so that the first score block instance
looks up "flute" in the movement1 namespace, while the second score block
instance looks up "flute" in the movement2 namespace.

I'm sure this can't be a unique use case. Any suggestions on the best way to
accomplish some or all of this? Am I thinking too much like a Python
programmer to see the natural way to approach these issues in
Lilypond/Scheme? Are some of these issues unsolvable without changes to
Lilypond?

Some similar questions:
http://lilypond.1069038.n5.nabble.com/Books-bookparts-includes-what-td52157.html
http://lilypond.1069038.n5.nabble.com/bookparts-with-paper-blocks-td145242.html
http://stackoverflow.com/questions/20858042/define-function-inside-score-in-lilypond

Thanks,

Saul



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