add resource handling before printing

Resources are currently filtered (in order to prevent printing) at print
time in their HumanReadablePrinter handlers. This design makes it not
possible to filter objects when they are printed using any other
printer, such as YAML, JSON, or the NamePrinter.

This patch removes any filters previously added at the printer level for
pods and adds a way to define resource-specific filters before they are
sent to a printer handler. A woking filter handler for pods has also
been
implemented.

Filters affect resources being printed through the HumanReadablePrinter,
YAML, JSON, and `--template` printers.

pkg/kubectl/cmd/util/factory.go

@@ -1179,6 +1179,29 @@ func DefaultClientConfig(flags *pflag.FlagSet) clientcmd.ClientConfig {
 	return clientConfig
 }
 
+func (f *Factory) DefaultResourceFilterOptions(cmd *cobra.Command, withNamespace bool) *kubectl.PrintOptions {
+	columnLabel, err := cmd.Flags().GetStringSlice("label-columns")
+	if err != nil {
+		columnLabel = []string{}
+	}
+	opts := &kubectl.PrintOptions{
+		NoHeaders:          GetFlagBool(cmd, "no-headers"),
+		WithNamespace:      withNamespace,
+		Wide:               GetWideFlag(cmd),
+		ShowAll:            GetFlagBool(cmd, "show-all"),
+		ShowLabels:         GetFlagBool(cmd, "show-labels"),
+		AbsoluteTimestamps: isWatch(cmd),
+		ColumnLabels:       columnLabel,
+	}
+
+	return opts
+}
+
+// DefaultResourceFilterFunc returns a collection of FilterFuncs suitable for filtering specific resource types.
+func (f *Factory) DefaultResourceFilterFunc() kubectl.Filters {
+	return kubectl.NewResourceFilter()
+}
+
 // PrintObject prints an api object given command line flags to modify the output format
 func (f *Factory) PrintObject(cmd *cobra.Command, mapper meta.RESTMapper, obj runtime.Object, out io.Writer) error {
 	gvks, _, err := api.Scheme.ObjectKinds(obj)