[88] Add keplog.py

This is a first pass at issue KeplerGO#88, converting pyke to more Pythonic
logging.

pyke/keplog.py

@@ -0,0 +1,65 @@
+import logging
+
+_logger = logging.getLogger('pyke')
+_logger.setLevel(logging.INFO)
+
+formatter = logging.Formatter('%(asctime)s %(levelname)s - %(message)s',
+                              '%Y-%m-%d %H:%M:%S')
+
+console_handler = logging.StreamHandler()
+console_handler.setFormatter(formatter)
+
+_logger.addHandler(console_handler)
+
+
+def debug(*args, **kwargs):
+    _logger.debug(*args, **kwargs)
+
+
+def info(*args, **kwargs):
+    _logger.info(*args, **kwargs)
+
+
+def warn(*args, **kwargs):
+    _logger.warn(*args, **kwargs)
+
+
+def error(*args, **kwargs):
+    _logger.error(*args, **kwargs)
+
+
+def exception(*args, **kwargs):
+    _logger.exception(*args, **kwargs)
+
+
+def set_level(level):
+    try:
+        _logger.setLevel(getattr(logging, level))
+    except TypeError:
+        _logger.setLevel(level)
+
+
+def set_logfile(log_filepath):
+    fh = logging.FileHandler(log_filepath)
+    fh.setFormatter(formatter)
+    _logger.addHandler(fh)
+
+
+def setup_args(parser):
+    g = parser.add_mutually_exclusive_group()
+    g.add_argument('--silent',
+                   action='store_true',
+                   help='Set log level to ERROR or above')
+    g.add_argument('--debug',
+                   action='store_true',
+                   help='Set log level to DEBUG or above')
+
+
+def handle_args(args):
+    if args.silent:
+        _logger.setLevel(logging.ERROR)
+    if args.debug:
+        _logger.setLevel(logging.DEBUG)
+
+    if args.logfile is not None:
+        set_logfile(args.logfile)