Re: Combining roughly 70 separate files into a single book

[Federico Bruni]

Il giorno mer 29 apr 2020 alle 02:36, Brent Annable 
<address@hidden> ha scritto:
> Does that do page numbers as well?  I'd really like to eliminate any 
> extra steps if possible; my goal is to have a master file that I can 
> adjust as necessary, and then just press a button to spit the whole 
> thing out every time I need a new version.
>
> Based on Jerry's suggestion I've done a little experimenting. Using a 
> structure like this:
>
> \book {
> \bookpart {\include "O-Welt-ich-muss-dich.ly"}
> \bookpart {\include "O-Welt-ich-muss-dich.ly"}
> }
>
> does produce scores in sequence with headings, etc. in place, but the 
> music processing is full of errors and the output is nonsensical (see 
> attachment). Can someone explain to me why this approach doesn't 
> work? I thought that anything in a \bookpart block should be 
> independent of everything around it, is that not the case? I even 
> tried it with multiple \book blocks, but that produced nothing at all.

IIRC the reason is that you cannot include, within a bookpart, a file 
which contains top level expressions.
This means that, even if you remove the top level expressions (such as 
\score), in any case you'll need an extra file to produce the PDF of 
the single piece.

I usually follow this strategy:

- Piece-Name.ily: file containing only music variables (doesn't produce 
any output), including a variable for the \score block. You'd better 
use variable names which are unique within your project.
- Piece-Name.ly: here I include above file and call the \score 
variable, to print a single PDF.
- If the piece is part of a collection, the collection.ly file will 
include only the .ily file and call the \score variable.

HTH
Federico