Make sure it's either `auto' (the default), `always' or `never'. If it
does not match any of the values, raise a Docopt exception that causes
it to print usage and exit.
Tested:
- $ sudo ./bootstrap-vz --color=invalid manifests/gce.manifest.yml
Value of --color must be one of auto, always or never.
Usage: bootstrap-vz [options] MANIFEST
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
Mimic the behavior of the --color=<auto|always|never> found in tools
like `ls' and `grep'. Default to `auto' which checks whether stderr is a
tty to define whether colors are used.
Tested:
- Ran ./boostrap-vz --color=never and --color=always, confirmed
colorization worked as expected.
- Ran ./boostrap-vz --color=auto ${manifest_file} 2>bootstrap.log,
confirmed colors were not added to boostrap.log by default, repeated
the test with --color=always and confirmed escape sequences were
output.
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
