pyreadline_trunk: quickfix for #228. Now defaults to ascii encoding if non-valid encoding is used.

doc/ChangeLog

@@ -1,3 +1,8 @@
+2008-02-21 Jörgen Stenarson  <jorgen.stenarson -at- bostream.nu>
+	* unicodehelper functions now defaults to ascii if supplied pyreadline_encoding is 
+	  not a valid encoding. This is a brute force solution to ticket #228 it fixes 
+	  immediate symptom but may not be the correct solution to the underlying problem.
+	
 2008-01-07 Jörgen Stenarson  <jorgen.stenarson -at- bostream.nu>
 	* Reintroduced code to make pyreadline work with emacs. Not tested.
 	  Requested by Frank Wang.

pyreadline/unicode_helper.py

@@ -17,11 +17,17 @@ except AttributeError:        #This error occurs when pdb imports readline and d
 def ensure_unicode(text):
     """helper to ensure that text passed to WriteConsoleW is unicode"""
     if isinstance(text, str):
-        return text.decode(pyreadline_codepage, "replace")
+        try:
+            return text.decode(pyreadline_codepage, "replace")
+        except (LookupError, TypeError):
+            return text.decode("ascii", "replace")
     return text
 
 def ensure_str(text):
     """Convert unicode to str using pyreadline_codepage"""
     if isinstance(text, unicode):
-        return text.encode(pyreadline_codepage, "replace")
+        try:
+            return text.encode(pyreadline_codepage, "replace")
+        except (LookupError, TypeError):
+            return text.encode("ascii", "replace")
     return text