allow a callable no-arg prefix for the debugger (#235)

This could be useful for, for example, printing a timestamp
circuits · Oct 13, 2017 · cdd4f1a · cdd4f1a
1 parent 1327b29
commit cdd4f1a
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/circuits/core/debugger.py b/circuits/core/debugger.py
@@ -113,7 +113,10 @@ def _on_event(self, event, *args, **kwargs):
             s = repr(event)
 
             if self.prefix:
-                s = "%s: %s" % (self.prefix, s)
+                if hasattr(self.prefix, '__call__'):
+                    s = "%s: %s" % (self.prefix(), s)
+                else:
+                    s = "%s: %s" % (self.prefix, s)
 
             if self.trim:
                 s = "%s ...>" % s[:self.trim]