X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fkeep-alive-together-engraver.cc;h=6875cd022fa68cf9e57eb4328c6d5af9f81952ed;hb=5d84bfad4626892bcffd05adcced53c8a2329047;hp=b53b91eca439613324de54c69d5275b75bd7e568;hpb=1de3d397c18622b6061402fef18e625701712bc5;p=lilypond.git

diff --git a/lily/keep-alive-together-engraver.cc b/lily/keep-alive-together-engraver.cc
index b53b91eca4..6875cd022f 100644
--- a/lily/keep-alive-together-engraver.cc
+++ b/lily/keep-alive-together-engraver.cc
@@ -22,23 +22,23 @@
 #include "engraver.hh"
 #include "grob.hh"
 #include "grob-array.hh"
+#include "international.hh"
 
 #include "translator.icc"
 
-using std::vector;
-
 class Keep_alive_together_engraver: public Engraver
 {
   vector<Grob *> group_spanners_;
 
 public:
   TRANSLATOR_DECLARATIONS (Keep_alive_together_engraver);
-  DECLARE_ACKNOWLEDGER (hara_kiri_group_spanner);
+  void acknowledge_hara_kiri_group_spanner (Grob_info);
 
   virtual void finalize ();
 };
 
-Keep_alive_together_engraver::Keep_alive_together_engraver ()
+Keep_alive_together_engraver::Keep_alive_together_engraver (Context *c)
+  : Engraver (c)
 {
 }
 
@@ -66,12 +66,44 @@ Keep_alive_together_engraver::finalize ()
         {
           if (i == j)
             continue;
+
+          if (scm_is_symbol (this_layer))
+            {
+              if (scm_is_eq (this_layer, ly_symbol2scm ("any")))
+                {
+                  // layer is kept alive by any other layer
+                  live->add (group_spanners_[j]);
+                  continue;
+                }
+              else if (scm_is_eq (this_layer, ly_symbol2scm ("above")))
+                {
+                  // layer is kept alive by the layer preceding it
+                  if (i == j + 1)
+                    live->add (group_spanners_[j]);
+                  continue;
+                }
+              else if (scm_is_eq (this_layer, ly_symbol2scm ("below")))
+                {
+                  // layer is kept alive by the layer following it
+                  if (i == j - 1)
+                    live->add (group_spanners_[j]);
+                  continue;
+                }
+              else
+                {
+                  group_spanners_[i]->warning (_f ("unknown remove-layer value `%s'",
+                                                   ly_symbol2string (this_layer).c_str ()));
+                  continue;
+                }
+            }
+
           SCM that_layer = group_spanners_[j]->get_property ("remove-layer");
+
           if (scm_is_false (that_layer))
             continue;
           if (!scm_is_integer (this_layer))
             {
-              // Unspecified layers are kept alive by anything else
+              // unset layers are kept alive by all but ignored layers
               live->add (group_spanners_[j]);
               continue;
             }
@@ -90,7 +122,12 @@ Keep_alive_together_engraver::finalize ()
     }
 }
 
-ADD_ACKNOWLEDGER (Keep_alive_together_engraver, hara_kiri_group_spanner);
+
+void
+Keep_alive_together_engraver::boot ()
+{
+  ADD_ACKNOWLEDGER (Keep_alive_together_engraver, hara_kiri_group_spanner);
+}
 
 ADD_TRANSLATOR (Keep_alive_together_engraver,
                 /* doc */