indent fix.

[lilypond.git] / scm / backend-library.scm

diff --git a/scm/backend-library.scm b/scm/backend-library.scm
index 5116fecd823fb16317eed0b8705c9777a46f2e86..90c0cd07edfa725620e215eb4ba89d20fad9323d 100644 (file)
--- a/scm/backend-library.scm
+++ b/scm/backend-library.scm
@@ -20,6 +20,7 @@
 ;; backend helpers.
 
 (use-modules (scm ps-to-png)
+            (scm paper-system)
             (ice-9 optargs))
 
 (define-public (ly:system command . rest)
@@ -201,6 +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)