disable colors on pipe

rscli/cli.py

@@ -9,8 +9,11 @@ from rscli.httputils import req
 
 try:
     from colors import color
+    has_colors = True
 except ImportError:
+    has_colors = False
 
+if not has_colors or not sys.stdout.isatty():
     def color(text, *args, **kwargs):
         return text