Attempt to silence yacc

Reference #65

patacrep/latex/syntax.py

@@ -224,13 +224,20 @@ class Parser:
             else:
                 symbols[0] = symbols[2].prepend(symbols[1])
 
+def silent_yacc(*args, **kwargs):
+    """Call yacc, suppressing (as far as possible) output and generated files.
+    """
+    return yacc.yacc(
+        write_tables=0,
+        debug=0,
+        *args,
+        **kwargs
+        )
 
 def tex2plain(string):
     """Parse string and return its plain text version."""
     return detex(
-            yacc.yacc(
-                write_tables=0,
-                debug=0,
+        silent_yacc(
             module=Parser(),
             ).parse(
                 string,
@@ -241,7 +248,7 @@ def tex2plain(string):
 def parsesong(string, filename=None):
     """Parse song and return its metadata."""
     return detex(
-            yacc.yacc(module=Parser(filename)).parse(
+        silent_yacc(module=Parser(filename)).parse(
             string,
             lexer=SongLexer().lexer,
             ).metadata