apps picker: allow configurability of default app

Closes #190

internal/cli/apps.go

@@ -32,6 +32,13 @@ var (
 		Help:       "Name of the application.",
 		IsRequired: true,
 	}
+	appNone = Flag{
+		Name:      "None",
+		LongForm:  "none",
+		ShortForm: "n",
+		Help:      "Specify none of your apps",
+	}
+
 	appType = Flag{
 		Name:      "Type",
 		LongForm:  "type",
@@ -117,7 +124,57 @@ func appsCmd(cli *cli) *cobra.Command {
 	cmd.AddCommand(showAppCmd(cli))
 	cmd.AddCommand(updateAppCmd(cli))
 	cmd.AddCommand(deleteAppCmd(cli))
+	cmd.AddCommand(useAppCmd(cli))
+
+	return cmd
+}
+
+func useAppCmd(cli *cli) *cobra.Command {
+	var inputs struct {
+		ID   string
+		None bool
+	}
+
+	cmd := &cobra.Command{
+		Use:   "use",
+		Short: "Choose a default application",
+		Long: `auth0 apps use <client-id>
+Specify your preferred application for interaction with the auth0 CLI
+`,
+		PreRun: func(cmd *cobra.Command, args []string) {
+			prepareInteractivity(cmd)
+		},
+
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if inputs.None {
+				inputs.ID = ""
+			} else {
+				if len(args) == 0 {
+					err := appID.Pick(cmd, &inputs.ID, cli.appPickerOptions)
+					if err != nil {
+						return err
+					}
+				} else {
+					inputs.ID = args[0]
+				}
+			}
+
+			if err := cli.setDefaultAppID(inputs.ID); err != nil {
+				return err
+			}
+
+			if inputs.ID == "" {
+				cli.renderer.Infof("Successfully removed the default application")
+			} else {
+				cli.renderer.Infof("Successfully set the default application to %s", ansi.Faint(inputs.ID))
+				cli.renderer.Infof("%s: You might wanna try `auth0 quickstarts download`", ansi.Faint("Hint:"))
+			}
+
+			return nil
+		},
+	}
 
+	appNone.RegisterBool(cmd, &inputs.None, false)
 	return cmd
 }
 
@@ -352,6 +409,10 @@ auth0 apps create --name myapp --type [native|spa|regular|m2m]
 				return fmt.Errorf("Unable to create application: %w", err)
 			}
 
+			if err := cli.setDefaultAppID(a.GetClientID()); err != nil {
+				return err
+			}
+
 			// Render result
 			// note: a is populated with the rest of the client fields by the API during creation.
 			revealClientSecret := auth0.StringValue(a.AppType) != "native" && auth0.StringValue(a.AppType) != "spa"
@@ -736,7 +797,7 @@ func (c *cli) appPickerOptions() (pickerOptions, error) {
 		opt := pickerOption{value: value, label: label}
 
 		// check if this is currently the default application.
-		if _, ok := tenant.Apps[c.GetClientID()]; ok {
+		if tenant.DefaultAppID == c.GetClientID() {
 			priorityOpts = append(priorityOpts, opt)
 		} else {
 			opts = append(opts, opt)

internal/cli/cli.go

@@ -40,11 +40,12 @@ type config struct {
 // tenant is the cli's concept of an auth0 tenant. The fields are tailor fit
 // specifically for interacting with the management API.
 type tenant struct {
-	Name        string         `json:"name"`
-	Domain      string         `json:"domain"`
-	AccessToken string         `json:"access_token,omitempty"`
-	ExpiresAt   time.Time      `json:"expires_at"`
-	Apps        map[string]app `json:"apps,omitempty"`
+	Name         string         `json:"name"`
+	Domain       string         `json:"domain"`
+	AccessToken  string         `json:"access_token,omitempty"`
+	ExpiresAt    time.Time      `json:"expires_at"`
+	Apps         map[string]app `json:"apps,omitempty"`
+	DefaultAppID string         `json:"default_app_id,omitempty"`
 }
 
 type app struct {
@@ -292,9 +293,24 @@ func (c *cli) isFirstCommandRun(clientID string, command string) (bool, error) {
 	return true, nil
 }
 
-func (c *cli) setFirstCommandRun(clientID string, command string) error {
+func (c *cli) setDefaultAppID(id string) error {
 	tenant, err := c.getTenant()
+	if err != nil {
+		return err
+	}
 
+	tenant.DefaultAppID = id
+
+	c.config.Tenants[tenant.Name] = tenant
+	if err := c.persistConfig(); err != nil {
+		return fmt.Errorf("Unexpected error persisting config: %w", err)
+	}
+
+	return nil
+}
+
+func (c *cli) setFirstCommandRun(clientID string, command string) error {
+	tenant, err := c.getTenant()
 	if err != nil {
 		return err
 	}