Re: Is there an equivalent of #define ... #ifndef ... #endif in lilypond?

[Michael Hendry]

David Kastrup wrote:
> 
> Michael Hendry <address@hidden> writes:
> 
>>> Ok, tags work with music, not with books.  Here is what I would suggest:
>>> 
>>> ConcertBook =
>>> \book {
>>>   ...
>>> }
>>> 
>>> and then you can at a later point of time say
>>> 
>>> \ConcertBook
>>> 
>>> and can comment that line out or not.  Assigning #f to ConcertBook when
>>> a command line option is set is a bit trickier, but still reasonably
>>> easy.
>>> 
>> That sounds good, but when I tried it I got...
>>
>> address@hidden:~/indigo/workspace/TestTag$ lilypond score.ly
>> GNU LilyPond 2.14.2
>> Processing `score.ly'
>> Parsing...
>> score.ly:92:0: error: syntax error, unexpected BOOK_IDENTIFIER
>>
>> \ConcertBook
> 
> Pffft.  Taking a look at the LilyPond grammar (it is also in an appendix
> in the notation manual), it turns out that you have to write
> 
> \book { \ConcertBook }
> 
> here.  Turns out that a book identifier can be used in both \bookpart
> and \book.  That's a bit more for outcommenting and it becomes harder to
> use this conditionally.
> 
> -- 
> David Kastrup
> 
> 
> 

It's an odd way of doing things, effectively having to enclose a \book with
a \book. Not only that, but it doesn't work correctly in terms of naming the
output files.

If I compile: 

\book { \GuitarBook }
\book { \ConcertBook }
\book { \TrumpetBook }
\book { \AltoBook }

I get the correct information in the output files, but the filenames are...

TestTag (alto).pdf
TestTag (alto)-1.pdf
TestTag (alto)-2.pdf
TestTag (alto)-3.pdf

...although the definition of GuitarBook includes '\bookOutputName "TestTag
(gtr)"', and so on for the other parts.

If I switch the order around...

\book { \AltoBook }
\book { \GuitarBook }
\book { \ConcertBook }
\book { \TrumpetBook }

The names all include "(alto)", as before, but the contents are

TestTag (alto).pdf      - Alto Part
TestTag (alto)-1.pdf   - Guitar Part
TestTag (alto)-2.pdf   - Concert Part
TestTag (alto)-3.pdf   - Trumpet Part

It looks as though \bookOutputName is treated as a global variable, even
though it's defined inside a \book {} which is itself defined within a
variable's assignment statement.

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