Make an stderr handler available as well and provide a way to swap be…

…tween them

core/dbt/logger.py

@@ -50,6 +50,11 @@ def notice(self, msg, *args, **kwargs):
 stdout_handler.setFormatter(logging.Formatter('%(message)s'))
 stdout_handler.setLevel(NOTICE)
 
+stderr_handler = logging.StreamHandler()
+stderr_handler.setFormatter(logging.Formatter('%(message)s'))
+stderr_handler.setLevel(WARNING)
+
+
 logger = logging.getLogger('dbt')
 logger.addHandler(stdout_handler)
 logger.setLevel(DEBUG)
@@ -79,6 +84,13 @@ def notice(self, msg, *args, **kwargs):
 initialized = False
 
 
+def log_to_stderr(logger):
+ if stdout_handler in logger.handlers:
+ logger.handlers.remove(stdout_handler)
+ if stderr_handler not in logger.handlers:
+ logger.addHandler(stderr_handler)
+
+
 def make_log_dir_if_missing(log_dir):
  import dbt.clients.system
  dbt.clients.system.make_directory(log_dir)
@@ -99,14 +111,17 @@ def default_formatter():
 
 
 def initialize_logger(debug_mode=False, path=None):
- global initialized, logger, stdout_handler
+ global initialized, logger, stdout_handler, stderr_handler
 
  if initialized:
  return
 
  if debug_mode:
+ # we'll only use one of these, but just set both up
  stdout_handler.setFormatter(default_formatter())
  stdout_handler.setLevel(DEBUG)
+ stderr_handler.setFormatter(default_formatter())
+ stderr_handler.setLevel(DEBUG)
 
  if path is not None:
  make_log_dir_if_missing(path)