On Jan 21, 2010, at 11:47 AM, Michael J. O'Donnell wrote:
Is there a standard way to make sure that a file full of LilyPond
style
definitions is included just once, no matter how many times it is
mentioned?
I searched the Web site, mail archives, and /usr/shar/lilypond for
"include once" and "include guard", to no avail. With the C
preprocessor, there is a standard trick for setting and testing a
variable to disable all but the first attempt to include a header
file.
Some languages have an "include-once" command.
I am putting together a large choral score from bookparts for each
number in the work. I like to be able to produce either a single
number,
or the whole score. The natural approach is to include style
definitions
in each of the files that I might set, including the file to format
the
whole score and the files to format individual numbers. Files to
format
individual numbers also include the style definitions.
I find that repeated inclusion of the same definitions leads
quickly to
a segmentation fault.
I can either add one more level of indirection, with one more file per
number. Or, I can do some Scheme hacking, with a global variable to
set
showing inclusion (tricky, because the variable needs to be testable
reliably even when it has never been set explicitly).
But, I'd prefer to use a well-known standard method, if it exists.
Without seeing your code, it's hard to tell what the problem is.
When using \include to have a set of definitions, it is only
necessary to do this once per .ly file. I put them up high in the
file (pop-chords.ly is a chord exceptions file to prettify the way
Lilypond writes jazz chords; paren-2.ly is a definition to be able to
parenthesize optional chord names):
\version "2.12.2"
#(ly:set-option 'delete-intermediate-files #t)
\paper {
indent = 0.0
ragged-last = ##f
}
\header {
title = "Recycling Day"
subtitle = "Concert Pitch"
composer = "McNamara"
meter = "Up-Tempo Swing or Bebop"
copyright = "Tim McNamara, All Rights Reserved"
}
\include "../../pop-chords.ly"
\include "../../paren-2.ly"
*********************************
Any bookparts would only contain what is below this line, so the
\include command would not be repeated:
*********************************
harmonies = \chordmode {
Chords go here
}
melody = \relative c' {
\override Staff.TimeSignature #'style = #'()
\time 4/4
\clef treble
\key c \major
Melody goes here
}
\score {
<<
\new ChordNames {
\set chordChanges = ##t
\harmonies
}
\new Staff \melody
>>
}
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