Issue 4204: Convert ly::time-signature::print from C++ to Scheme.

[lilypond.git] / scm / time-signature.scm

diff --git a/scm/time-signature.scm b/scm/time-signature.scm
new file mode 100644 (file)
index 0000000..d4f678d
--- /dev/null
+++ b/scm/time-signature.scm
@@ -0,0 +1,35 @@
+;;;; This file is part of LilyPond, the GNU music typesetter.
+;;;;
+;;;; Copyright (C) 2014 Daniel Eble <dan@faithful.be>
+;;;;
+;;;; 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/>.
+
+(define-public (ly:time-signature::print grob)
+  "Print routine for time signatures."
+  (let* ((fraction (ly:grob-property grob 'fraction '(4 . 4)))
+         (style (ly:grob-property grob 'style 'default))
+         (proc (assoc-get style time-signature-style-markup-procedures))
+         (markup (if (procedure? proc)
+                     (proc fraction)
+                     (make-glyph-time-signature-markup style fraction))))
+    (grob-interpret-markup grob markup)))
+
+(define-public (add-simple-time-signature-style style proc)
+  "Specify the procedure @{proc} returning markup for a time signature
+style @var{style}.  The procedure is called with one argument, the
+pair @code{(@var{numerator} . @var{denominator})}."
+  (set! time-signature-style-markup-procedures
+        (acons style proc time-signature-style-markup-procedures)))
+
+(define-session time-signature-style-markup-procedures `())