Web-ja: update introduction

[lilypond.git] / ly / context-mods-init.ly

diff --git a/ly/context-mods-init.ly b/ly/context-mods-init.ly
index d3ae2129fac6c0c04fc5d844d0e152d9267e225a..a4064f4b327a4df15bef871dff36d801efe50d2d 100644 (file)
--- a/ly/context-mods-init.ly
+++ b/ly/context-mods-init.ly
@@ -1,6 +1,6 @@
 %%%% This file is part of LilyPond, the GNU music typesetter.
 %%%%
-%%%% Copyright (C) 2011--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
+%%%% Copyright (C) 2011--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 %%%%                    Jan Nieuwenhuizen <janneke@gnu.org>
 %%%%
 %%%% LilyPond is free software: you can redistribute it and/or modify
@@ -23,3 +23,34 @@ RemoveEmptyStaves = \with {
   \description "Remove staves which are considered to be empty according
 to the list of interfaces set by @code{keepAliveInterfaces}."
 }
+
+RemoveAllEmptyStaves = \with {
+  \override VerticalAxisGroup.remove-empty = ##t
+  \override VerticalAxisGroup.remove-first = ##t
+  \description "Remove staves which are considered to be empty according
+to the list of interfaces set by @code{keepAliveInterfaces}, including those
+in the first system."
+}
+
+inherit-acceptability =
+#(define-void-function (to from)
+   (symbol? symbol?)
+   (_i "When used in an output definition, will modify all context
+definitions such that context @var{to} is accepted as a child by all
+contexts that also accept @var{from}.")
+   (let* ((module (current-module))
+         (cmod (ly:make-context-mod)))
+     (ly:add-context-mod cmod (list 'accepts to))
+     (if (output-module? module)
+        (module-map
+         (lambda (_sym var)
+           (if (variable-bound? var)
+               (let ((cdef (variable-ref var)))
+                 (if (ly:context-def? cdef)
+                     (let ((accepts (ly:context-def-lookup cdef 'accepts)))
+                       (if (and (memq from accepts)
+                                (not (memq to accepts)))
+                           (variable-set! var
+                                          (ly:context-def-modify cdef cmod))))))))
+         module)
+        (ly:parser-error (_ "Not in an output definition")))))