duh

diff --git a/scripts/filter-lilypond-book.py b/scripts/filter-lilypond-book.py
index 8c3e4eb30d24cc986948600a1fbb096441c5d50a..2919b51e8b538c6700e269c339fab5500173dd02 100644 (file)
--- a/scripts/filter-lilypond-book.py
+++ b/scripts/filter-lilypond-book.py
@@ -433,7 +433,7 @@ class Snippet:
                base = self.basename (source)
                if os.path.exists (base + '.ly') \
                   and os.path.exists (base + '.tex') \
-                  and (not use_hash_p \
+                  and (use_hash_p \
                        or self.ly (source) == open (base + '.ly').read ()):
                        # TODO: something smart with target formats
                        # (ps, png) and m/ctimes