[PATCH] msg: Add stdout/stderr filters

[Richard Purdie <richard.purdie@linuxfoundation.org>]

Add logging filters which can be used to split output between stdout and
stderr, ERROR messages and above as passed by the Err filter, anything
below ERROR is passed by the Out filter. This is useful when trying to make
stderr more useful.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/bitbake/lib/bb/msg.py b/bitbake/lib/bb/msg.py
index 5976970..d79768d 100644
--- a/bitbake/lib/bb/msg.py
+++ b/bitbake/lib/bb/msg.py
@@ -126,7 +126,21 @@ class BBLogFilter(object):
             return True
         return False
 
+class BBLogFilterStdErr(BBLogFilter):
+    def filter(self, record):
+        if not BBLogFilter.filter(self, record):
+            return False
+        if record.levelno >= logging.ERROR:
+            return True
+        return False
 
+class BBLogFilterStdOut(BBLogFilter):
+    def filter(self, record):
+        if not BBLogFilter.filter(self, record):
+            return False
+        if record.levelno < logging.ERROR:
+            return True
+        return False
 
 # Message control functions
 #
@@ -164,10 +178,10 @@ def constructLogOptions():
         debug_domains["BitBake.%s" % domainarg] = logging.DEBUG - dlevel + 1
     return level, debug_domains
 
-def addDefaultlogFilter(handler):
+def addDefaultlogFilter(handler, cls = BBLogFilter):
     level, debug_domains = constructLogOptions()
 
-    BBLogFilter(handler, level, debug_domains)
+    cls(handler, level, debug_domains)
 
 #
 # Message handling functions