Add 'outdated' Command Skeleton

Signed-off-by: Emanuel Bennici <eb@fabmation.de>

cmd/helm/outdated.go

@@ -0,0 +1,52 @@
+/*
+Copyright The Helm Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"io"
+
+	"github.com/spf13/cobra"
+	"helm.sh/helm/v3/cmd/helm/require"
+	"helm.sh/helm/v3/pkg/action"
+	"helm.sh/helm/v3/pkg/cli/output"
+)
+
+var outdatedHelp = `
+This Command lists all releases which are outdated.
+
+By default, the output is printed in a Table but you can change this behavior
+with the '--output' Flag.
+`
+
+func newOutdatedCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
+	client := action.NewList(cfg)
+	var outfmt output.Format
+
+	cmd := &cobra.Command{
+		Use:     "outdated",
+		Short:   "list outdated releases",
+		Long:    outdatedHelp,
+		Aliases: []string{"od"},
+		Args:    require.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return nil
+		},
+	}
+
+	flags := cmd.Flags()
+	flags.BoolVarP(&client.AllNamespaces, "all-namespaces", "A", false, "list releases across all namespaces")
+	bindOutputFlag(cmd, &outfmt)
+
+	return cmd
+}