Extending \lilypondfile to support separate handling of header fields for use by LaTeX et.al.

[Michael Haynie]

I had a good look at the proposed alternative mechanism as described in 
lilypondmacros.  It mostly worked, but left me with a fair amount of 
hand editing that would have to be revisited each time I rearranged the 
songs in the book -- a *frequent* occurrence when I'm laying out a book 
for final printing.  I studied what you did, and I've developed an 
alternative suggestion, in several parts:

* lilypondSystemMacros.tex contains implementations of some useful TeX 
macros.  They can be used without modification -- they only need to be 
included in the document at some point -- preferably in the preamble.  
It will be best to provide this file in the distribution to be 
included, as opposed to generated in the source directory each time.  
There is a fair amount of commentary on what the various parts are 
doing.  I didn't include every facility in the original, since I wasn't 
completely certain what it's all for.  I'm probably missing something 
-- maybe a verbatim facility?  Error handling isn't especially complete 
either.  We can refine that later.  There may be some stupid programmer 
tricks in the LaTeX macros -- stay alert.

* example.tex contains an example of use, including several 
alternatives.  It is the generated file instead of the source file, but 
you get the idea.

The generated code should look like this:

The author writes this:
        \lilypondfile[staffsize=24]{BattleBelongsToTheLordBook.ly}
which becomes this:
        \lilyInputExample{2098660014}{8}

Lilypondbook would continue to produce eps files like 
lily-2098660014-1.eps, etc, as it does now.

I also think there should be a -H all argument to extract all defined 
header fields.

I'm satisfied that these macros and transformations will allow the 
construction of a song book without any editing of intermediate files.

I'd hack the lilypondmacro program, but I have not yet learned python, 
and wanted to share the above thoughts first.

lilypondSystemMacros.tex
Description: TeX document

example.tex
Description: TeX document

Thoughts?