Lilypond-book: Allow the snippets class to declare its own used options

diff --git a/python/book_snippets.py b/python/book_snippets.py
index 3c4f32d5d35ca7dded27a6ca29ce0ef36990cabc..fa4d97ccec6bb4d82db7ae96f7db30dbafdc2862 100644 (file)
--- a/python/book_snippets.py
+++ b/python/book_snippets.py
@@ -328,6 +328,9 @@ class LilypondSnippet (Snippet):
         self.do_options (os, self.type)
 
 
+    def snippet_options (self):
+        return [];
+
     def verb_ly_gettext (self, s):
         lang = self.formatter.document_language
         if not lang:
@@ -529,7 +532,7 @@ left-margin-default right-margin-default)"
                     found = 1
                     break
 
-            if not found and key not in simple_options:
+            if not found and key not in simple_options and key not in self.snippet_options ():
                 warning (_ ("ignoring unknown ly option: %s") % key)
 
         # URGS