Report unterminated ties hanging at end of input (issue 7019044)

[pkx166h]

Reviewers: zefram_fysh.org,

Message:
Issue 3062 - patch created by 'Zefram', but submitted by James

Description:
Report unterminated ties hanging at end of input

Issue 3062

LP doesn't report unterminated ties that are left hanging at the end
of input.  Compare { a2~ r2 } (which warns) with { a2~ } (which
doesn't).
Contrast against the handling of slurs, where both { a2( r2 } and { a2(
}
warn.

Please review this at https://codereview.appspot.com/7019044/

Affected files:
  M lily/tie-engraver.cc


Index: lily/tie-engraver.cc
diff --git a/lily/tie-engraver.cc b/lily/tie-engraver.cc
index  
07eb9196c78101a2c58ca5d4b1dabbc77cef9ad8..aa8544bcca0a05fc5a13090f82f6619f09678134  
100644
--- a/lily/tie-engraver.cc
+++ b/lily/tie-engraver.cc
@@ -88,6 +88,7 @@ protected:
   void typeset_tie (Grob *);
   void report_unterminated_tie (Head_event_tuple const &);
   bool has_autosplit_end (Stream_event *event);
+  virtual void finalize ();
 public:
   TRANSLATOR_DECLARATIONS (Tie_engraver);
 };
@@ -131,6 +132,14 @@ Tie_engraver::has_autosplit_end (Stream_event *event)
 }

 void
+Tie_engraver::finalize ()
+{
+  vector<Head_event_tuple>::iterator it = heads_to_tie_.begin ();
+  for (; it < heads_to_tie_.end (); it++)
+    report_unterminated_tie (*it);
+}
+
+void
 Tie_engraver::process_music ()
 {
   bool busy = event_;