Issue 1463 in lilypond: Writing metadata to the PDF file

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Enhancement Priority-Medium

New issue 1463 by brownian.box: Writing metadata to the PDF file
http://code.google.com/p/lilypond/issues/detail?id=1463

Reported by Reinhold Kainhofer,
http://lists.gnu.org/archive/html/bug-lilypond/2010-12/msg00382.html :

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The request for PDF hyperlinks of \page-ref and \label reminded me that it
might be a nice enhancement to write out some of the \header fields as  
DOCINFO fields (i.e. metadata) to the PDF file. The advantage would be that  
PDF readers would display the title (instead of the filename) in the window  
title, and the document information would contain more information about  
the author, title, etc.

All that needs to be done is to insert a DOCINFO pdfmark into the  
Postscript and gs will take care of it:
[ /Author string
  /Title string
  /Subject string
  /Keywords string
  /DOCINFO pdfmark

The DOCINFO pdfmark Postscript extension is documented by Adobe on page 28  
of  
http://partners.adobe.com/public/developer/en/acrobat/sdk/pdf/pdf_creation_apis_and_specs/pdfmarkReference.pdf

Now, I'm looking at the ps backend, but I don't know how to get access to  
the global header object from the write-preamble function in  
scm/framework-ps.scm.

Any idea how to obtain the global header object so I can extract things  
like title or composer?

Thanks,
Reinhold

PS: Bug squad, can you please file this as an enhancement request, so that  
it doesn't get lost?

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