turtles all the way down for NullCallableString()

allow term.color(5)('shmoo') to succeed for terminals where stream is
not a tty.

1 files changed, 6 insertions, 1 deletions

diff --git a/blessings/__init__.py b/blessings/__init__.py
index b135e01..7df617d 100644
--- a/blessings/__init__.py
+++ b/blessings/__init__.py
@@ -518,7 +518,12 @@ class NullCallableString(unicode):
             # determine which of 2 special-purpose classes,
             # NullParametrizableString or NullFormattingString, to return, and
             # retire this one.
-            return u''
+            # As a NullCallableString, even when provided with a parameter,
+            # such as t.color(5), we must also still be callable, fe:
+            # >>> t.color(5)('shmoo')
+            # is actually simplified result of NullCallable()(), so
+            # turtles all the way down: we return another instance.
+            return NullCallableString()
         return args[0]  # Should we force even strs in Python 2.x to be
                         # unicodes? No. How would I know what encoding to use
                         # to convert it?