From: Han-Wen Nienhuys <hanwen@xs4all.nl>
Date: Wed, 31 Mar 2004 11:59:44 +0000 (+0000)
Subject: * lily/change-iterator.cc (process): use find_existing_context().
X-Git-Tag: release/2.1.37~4
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=6e41e0cf6b09bf5cab7a5e0a41a05c19992fb998;p=lilypond.git

* lily/change-iterator.cc (process): use find_existing_context().

* Documentation/user/notation.itely (Automatic part combining):
add note about \relative.
---

diff --git a/ChangeLog b/ChangeLog
index 6b5e542396..f00f04b6f4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2004-03-31  Han-Wen Nienhuys   <hanwen@xs4all.nl>
 
+	* lily/change-iterator.cc (process): use find_existing_context().
+
 	* input/test/polymetric-differing-notes.ly: use ly:music-compress.
 
 	* input/regression/repeat-unfold-tremolo.ly: new file.
diff --git a/Documentation/user/notation.itely b/Documentation/user/notation.itely
index d9e3bc517e..e1a13537a2 100644
--- a/Documentation/user/notation.itely
+++ b/Documentation/user/notation.itely
@@ -3075,8 +3075,27 @@ Voices can be switched between staves manually, using the following command
 The string @var{staffname} is the name of the staff. It switches the
 current voice from its current staff to the Staff called
 @var{staffname}. Typically @var{staffname} is @code{"up"} or
-@code{"down"}.
+@code{"down"}. The @context{Staff} referred to must already exist, so
+usually the setup for a score will start with a setup of the staves,
 
+@example
+  <<
+  \context Staff = up @{
+    \skip 1 * 10  %@emph{ keep staff alive}
+    @}
+  \context Staff = down @{
+    \skip 1 * 10  %@emph{idem}
+    @}
+  >>
+@end example 
+
+
+and the @context{Voice} is inserted afterwards
+
+@example
+  \context Staff = down
+    \new Voice @{ @dots{} \change Staff = up @dots{} @}
+@end example
 
 
 @node Pedals
diff --git a/lily/change-iterator.cc b/lily/change-iterator.cc
index 804e3ff6e3..829ca048a4 100644
--- a/lily/change-iterator.cc
+++ b/lily/change-iterator.cc
@@ -65,7 +65,7 @@ Change_iterator::process (Moment m)
     if (last)
       {
 	Context * dest = 
-	  get_outlet ()->find_create_context (to_type, to_id, SCM_EOL);
+	  get_outlet ()->find_existing_context (to_type, to_id, SCM_EOL);
 	current->remove_context (last);
 	dest->add_context (last);
       }
diff --git a/lily/parser.yy b/lily/parser.yy
index 549093937e..f02b425f89 100644
--- a/lily/parser.yy
+++ b/lily/parser.yy
@@ -792,6 +792,10 @@ Repeated_music:
 
 		r-> set_property ("elements",alts);
 		if (gh_equal_p ($2, scm_makfrom0str ("tremolo"))) {
+			/*
+			TODO: move this code to Scheme.
+			*/
+
 			/*
 			we can not get durations and other stuff correct down the line, so we have to
 			add to the duration log here.