Add one-time convert-ly rule for grace beaming

diff --git a/python/convertrules.py b/python/convertrules.py
index 1ab911cca2c3f576f103e3eeee8566bfcd0bc481..2202cf0d99546d17f8784751c040344683e17cca 100644 (file)
--- a/python/convertrules.py
+++ b/python/convertrules.py
@@ -3672,6 +3672,12 @@ def conv(str):
         stderr_write (_ ("Staff-padding now controls the distance to the baseline, not the nearest point."))
     return str
 
+@rule((2, 17, 28), r'''\grace { x[ ... ] } -> \grace { x ... }''')
+def conv(str):
+    str = re.sub (r"(\\(?:grace|appoggiatura|acciaccatura|slashedGrace)\s*\{\s*(?:[()a-zA-Z',0-9.]|\\[()])*)\[([^][{}]*)\]((?:[()]|\\[()]|\s)*\})",
+                  r"\1\2\3", str)
+    return str
+
 # Guidelines to write rules (please keep this at the end of this file)
 #
 # - keep at most one rule per version; if several conversions should be done,