Add labctl playground machines [Playground ID]

cmd/playground/machines.go

@@ -0,0 +1,41 @@
+package playground
+
+import (
+	"context"
+	"fmt"
+	"text/tabwriter"
+	"github.com/spf13/cobra"
+	"github.com/iximiuz/labctl/internal/labcli"
+)
+
+func newMachinesCommand(cli labcli.CLI) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "machines [Playground ID]",
+		Short: `List machines of a specific playground by Playground ID`,
+		Args:  cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			playgroundID := args[0]
+			return labcli.WrapStatusError(runListMachines(cmd.Context(), cli, playgroundID))
+		},
+	}
+
+	return cmd
+}
+
+func runListMachines(ctx context.Context, cli labcli.CLI, playgroundID string) error {
+	play, err := cli.Client().GetPlay(ctx, playgroundID)
+	if err != nil {
+		return fmt.Errorf("couldn't find playground with ID %s: %w", playgroundID, err)
+	}
+
+	writer := tabwriter.NewWriter(cli.OutputStream(), 0, 4, 2, ' ', 0)
+	defer writer.Flush()
+
+	fmt.Fprintln(writer, "MACHINE NAME")
+
+	for _, machine := range play.Machines {
+		fmt.Fprintln(writer, machine.Name)
+	}
+
+	return nil
+}

cmd/playground/playground.go

@@ -17,6 +17,7 @@ func NewCommand(cli labcli.CLI) *cobra.Command {
 		newListCommand(cli),
 		newStartCommand(cli),
 		newStopCommand(cli),
+		newMachinesCommand(cli),
 	)
 
 	return cmd