X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;ds=sidebyside;f=scm%2Fbackend-library.scm;h=90c0cd07edfa725620e215eb4ba89d20fad9323d;hb=733d98665372b815cac635f48f1a20d65f50d25a;hp=3a4ccab817871d821b3e6641e1b0e4d044191e2f;hpb=a1f9375c70400bc4820921bd2ebbbb387a7dcf98;p=lilypond.git

diff --git a/scm/backend-library.scm b/scm/backend-library.scm
index 3a4ccab817..90c0cd07ed 100644
--- a/scm/backend-library.scm
+++ b/scm/backend-library.scm
@@ -1,14 +1,26 @@
-;;;; backend-library.scm -- helpers for the backends.
+;;;; This file is part of LilyPond, the GNU music typesetter.
 ;;;;
-;;;;  source file of the GNU LilyPond music typesetter
-;;;; 
-;;;; (c) 2005--2009 Jan Nieuwenhuizen <janneke@gnu.org>
+;;;; Copyright (C) 2005--2010 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;;; Han-Wen Nienhuys <hanwen@xs4all.nl>
+;;;;
+;;;; LilyPond is free software: you can redistribute it and/or modify
+;;;; it under the terms of the GNU General Public License as published by
+;;;; the Free Software Foundation, either version 3 of the License, or
+;;;; (at your option) any later version.
+;;;;
+;;;; LilyPond is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;;; GNU General Public License for more details.
+;;;;
+;;;; You should have received a copy of the GNU General Public License
+;;;; along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 
 ;; backend helpers.
 
 (use-modules (scm ps-to-png)
+	     (scm paper-system)
 	     (ice-9 optargs))
 
 (define-public (ly:system command . rest)
@@ -85,7 +97,7 @@
  -dDEVICEHEIGHTPOINTS=~$"
 					paper-width paper-height)))
 
-	 (cmd (simple-format #f
+	 (cmd (ly:format
 		      "~a\
  ~a\
  ~a\
@@ -190,6 +202,26 @@
       scope)))
   (apply string-append (map output-scope scopes)))
 
+(define-public (relevant-book-systems book)
+  (let ((systems (ly:paper-book-systems book)))
+    ;; skip booktitles.
+    (if (and (not (ly:get-option 'include-book-title-preview))
+	     (pair? systems)
+	     (ly:prob-property (car systems) 'is-book-title #f))
+	(cdr systems)
+	systems)))
+
+(define-public (relevant-dump-systems systems)
+  (let ((to-dump-systems '()))
+    (for-each
+      (lambda (sys)
+	(if (or (paper-system-title? sys)
+		(not (pair? to-dump-systems))
+		(paper-system-title? (car to-dump-systems)))
+	    (set! to-dump-systems (cons sys to-dump-systems))))
+      systems)
+    to-dump-systems))
+
 (define missing-stencil-list '())
 
 (define-public (backend-testing output-module)