Add client list command

Just exercising this quickly to see where it falls short.

internal/cli/cli.go

@@ -9,7 +9,6 @@ import (
 	"sync"
 
 	"github.com/auth0/auth0-cli/internal/display"
-	"github.com/spf13/cobra"
 	"gopkg.in/auth0.v5/management"
 )
 
@@ -105,11 +104,3 @@ func (c *cli) init() error {
 
 	return err
 }
-
-func mustRequireFlags(cmd *cobra.Command, flags ...string) {
-	for _, f := range flags {
-		if err := cmd.MarkFlagRequired(f); err != nil {
-			panic(err)
-		}
-	}
-}

internal/cli/clients.go

@@ -0,0 +1,48 @@
+package cli
+
+import (
+	"github.com/auth0/auth0-cli/internal/ansi"
+	"github.com/spf13/cobra"
+	"gopkg.in/auth0.v5/management"
+)
+
+func clientsCmd(cli *cli) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "clients",
+		Short: "manage resources for clients.",
+	}
+
+	cmd.SetUsageTemplate(resourceUsageTemplate())
+	cmd.AddCommand(listClientsCmd(cli))
+
+	return cmd
+}
+
+func listClientsCmd(cli *cli) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "list",
+		Short: "Lists your existing clients",
+		Long: `$ auth0 client list
+Lists your existing clients. To create one try:
+
+    $ auth0 client create
+`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			var list *management.ClientList
+
+			err := ansi.Spinner("Listing clients", func() (err error) {
+				list, err = cli.api.Client.List()
+				return err
+			})
+
+			if err != nil {
+				return err
+			}
+
+			cli.renderer.ClientList(list.Clients)
+			return nil
+		},
+	}
+
+	return cmd
+}

internal/cli/root.go

@@ -44,6 +44,8 @@ func Execute() {
 	rootCmd.PersistentFlags().BoolVar(&cli.verbose,
 		"verbose", false, "Enable verbose mode.")
 
+	rootCmd.AddCommand(clientsCmd(cli))
+
 	// TODO(cyx): backport this later on using latest auth0/v5.
 	// rootCmd.AddCommand(actionsCmd(cli))
 	// rootCmd.AddCommand(triggersCmd(cli))

internal/display/clients.go

@@ -0,0 +1,40 @@
+package display
+
+import (
+	"fmt"
+
+	"github.com/auth0/auth0-cli/internal/ansi"
+	"gopkg.in/auth0.v5"
+	"gopkg.in/auth0.v5/management"
+)
+
+func (r *Renderer) ClientList(clients []*management.Client) {
+	r.Heading(ansi.Bold(r.Tenant), "clients")
+
+	for _, c := range clients {
+		fmt.Fprintf(r.Writer, "- %s (%s)\n", auth0.StringValue(c.Name), appTypeFor(c.AppType))
+		fmt.Fprintf(r.Writer, "  %s: %s\n", ansi.Italic("ClientID"), ansi.Faint(auth0.StringValue(c.ClientID)))
+	}
+}
+
+func appTypeFor(v *string) string {
+	switch {
+	case v == nil:
+		return "generic"
+
+	case *v == "non_interactive":
+		return "machine to machine"
+
+	case *v == "native":
+		return "native"
+
+	case *v == "spa":
+		return "single page application"
+
+	case *v == "regular_web":
+		return "regular web application"
+
+	default:
+		return *v
+	}
+}