bitbake: lib/bb/msg: introduce logger_create() function

We use this code to set up a logger with colour in a number of different
places, so create one function that does this and make some of bitbake's
utility scripts use it.

(Bitbake rev: b1ba7d1cc8ec33e2d081230287abd07f52136097)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/msg.py

@@ -201,3 +201,18 @@ def fatal(msgdomain, msg):
         logger = logging.getLogger("BitBake")
     logger.critical(msg)
     sys.exit(1)
+
+def logger_create(name, output=sys.stderr, level=logging.INFO, preserve_handlers=False, color='auto'):
+    """Standalone logger creation function"""
+    logger = logging.getLogger(name)
+    console = logging.StreamHandler(output)
+    format = bb.msg.BBLogFormatter("%(levelname)s: %(message)s")
+    if color == 'always' or (color == 'auto' and output.isatty()):
+        format.enable_color()
+    console.setFormatter(format)
+    if preserve_handlers:
+        logger.addHandler(console)
+    else:
+        logger.handlers = [console]
+    logger.setLevel(level)
+    return logger