Refactor stack command

- Define command and subcommands only once
- Use annotations for k8s or swarm specific flags or subcommands

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

cli/command/stack/list.go

@@ -0,0 +1,35 @@
+package stack
+
+import (
+	"github.com/docker/cli/cli"
+	"github.com/docker/cli/cli/command"
+	"github.com/docker/cli/cli/command/stack/kubernetes"
+	"github.com/docker/cli/cli/command/stack/options"
+	"github.com/docker/cli/cli/command/stack/swarm"
+	"github.com/spf13/cobra"
+)
+
+func newListCommand(dockerCli command.Cli) *cobra.Command {
+	opts := options.List{}
+
+	cmd := &cobra.Command{
+		Use:     "ls",
+		Aliases: []string{"list"},
+		Short:   "List stacks",
+		Args:    cli.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if dockerCli.ClientInfo().HasKubernetes {
+				kli, err := kubernetes.WrapCli(dockerCli, cmd)
+				if err != nil {
+					return err
+				}
+				return kubernetes.RunList(kli, opts)
+			}
+			return swarm.RunList(dockerCli, opts)
+		},
+	}
+
+	flags := cmd.Flags()
+	flags.StringVar(&opts.Format, "format", "", "Pretty-print stacks using a Go template")
+	return cmd
+}