Add basic scheme programmable engravers.

[lilypond.git] / lily / context-scheme.cc

diff --git a/lily/context-scheme.cc b/lily/context-scheme.cc
index 96193f65e7ccbe05eec5d147c876ee4036334557..9e1b4c4f7a3f073a2fecf9aca115fe9d9e103fc6 100644 (file)
--- a/lily/context-scheme.cc
+++ b/lily/context-scheme.cc
@@ -1,16 +1,39 @@
 /*
-  context-scheme.cc -- Context bindings
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
-
-  (c) 1998--2008 Jan Nieuwenhuizen <janneke@gnu.org>
+  Copyright (C) 1998--2009 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/>.
 */
 
 #include "context.hh"
 #include "context-def.hh"
 #include "dispatcher.hh"
 
+LY_DEFINE (ly_context_current_moment,
+          "ly:context-current-moment",
+          1, 0, 0, (SCM context),
+          "Return the current moment of @var{context}.")
+{
+  Context *tr = unsmob_context (context);
+
+  LY_ASSERT_SMOB (Context, context, 1);
+
+  return tr->now_mom ().smobbed_copy ();
+}
+
 LY_DEFINE (ly_context_id, "ly:context-id",
           1, 0, 0, (SCM context),
           "Return the ID string of @var{context},"
@@ -69,14 +92,14 @@ LY_DEFINE (ly_context_pushpop_property, "ly:context-pushpop-property",
 }
 
 LY_DEFINE (ly_context_property, "ly:context-property",
-          2, 0, 0, (SCM c, SCM name),
-          "Return the value of @var{name} from context @var{c}.")
+          2, 0, 0, (SCM context, SCM sym),
+          "Return the value for property @var{sym} in @var{context}.")
 {
-  LY_ASSERT_SMOB (Context, c, 1);
-  LY_ASSERT_TYPE (ly_is_symbol, name, 2);
+  LY_ASSERT_SMOB (Context, context, 1);
+  LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
 
-  Context *t = unsmob_context (c);
-  return t->internal_get_property (name);
+  Context *t = unsmob_context (context);
+  return t->internal_get_property (sym);
 }
 
 LY_DEFINE (ly_context_set_property_x, "ly:context-set-property!",