Add --enable-color/--disable-color (#1140)

Author: Peter Amstutz

cwltool/argparser.py

@@ -250,6 +250,12 @@ def arg_parser():  # type: () -> argparse.ArgumentParser
                         help="Enable loading and running cwltool extensions "
                              "to CWL spec.", default=False)
 
+    exgroup = parser.add_mutually_exclusive_group()
+    exgroup.add_argument("--enable-color", action="store_true",
+                        help="Enable colored logging (default true)", default=True)
+    exgroup.add_argument("--disable-color", action="store_false", dest="enable_color",
+                        help="Enable colored logging (default true)")
+
     parser.add_argument("--default-container",
                         help="Specify a default docker container that will be used if the workflow fails to specify one.")
     parser.add_argument("--no-match-user", action="store_true",

cwltool/main.py

@@ -547,12 +547,14 @@ def main(argsl=None,                   # type: List[str]
             stderr_handler.setLevel(logging.DEBUG)
             rdflib_logger.setLevel(logging.DEBUG)
         formatter = None  # type: Optional[logging.Formatter]
+        fmtclass = coloredlogs.ColoredFormatter if args.enable_color else logging.Formatter
         if args.timestamps:
-            formatter = coloredlogs.ColoredFormatter(
+            formatter = fmtclass(
                 "[%(asctime)s] %(levelname)s %(message)s",
                 "%Y-%m-%d %H:%M:%S")
+
         else:
-            formatter = coloredlogs.ColoredFormatter("%(levelname)s %(message)s")
+            formatter = fmtclass("%(levelname)s %(message)s")
         stderr_handler.setFormatter(formatter)
         ##