Add json output for profile list

cmd/minikube/cmd/config/profile_list.go

@@ -17,9 +17,11 @@ limitations under the License.
 package config
 
 import (
+	"encoding/json"
 	"fmt"
 	"os"
 	"strconv"
+	"strings"
 
 	"k8s.io/minikube/pkg/minikube/config"
 	"k8s.io/minikube/pkg/minikube/exit"
@@ -29,12 +31,30 @@ import (
 	"github.com/spf13/cobra"
 )
 
+var (
+	output string
+)
+
 var profileListCmd = &cobra.Command{
 	Use:   "list",
 	Short: "Lists all minikube profiles.",
 	Long:  "Lists all valid minikube profiles and detects all possible invalid profiles.",
 	Run: func(cmd *cobra.Command, args []string) {
 
+		switch strings.ToLower(output) {
+		case "json":
+			PrintProfilesJSON()
+		case "table":
+			PrintProfilesTable()
+		default:
+			exit.WithCodeT(exit.BadUsage, fmt.Sprintf("invalid output format: %s. Valid values: 'table', 'json'", output))
+		}
+
+	},
+}
+
+func PrintProfilesTable() {
+
 	var validData [][]string
 
 	table := tablewriter.NewWriter(os.Stdout)
@@ -65,12 +85,47 @@ var profileListCmd = &cobra.Command{
 		}
 
 	}
+
 	if err != nil {
 		exit.WithCodeT(exit.Config, fmt.Sprintf("error loading profiles: %v", err))
 	}
-	},
+
+}
+
+func PrintProfilesJSON() {
+	validProfiles, invalidProfiles, err := config.ListProfiles()
+
+	var valid []*config.Profile
+	var invalid []*config.Profile
+
+	if validProfiles != nil {
+		valid = validProfiles
+	} else {
+		valid = []*config.Profile{}
+	}
+
+	if invalidProfiles != nil {
+		invalid = invalidProfiles
+	} else {
+		invalid = []*config.Profile{}
+	}
+
+	var body = map[string]interface{}{}
+
+	if err == nil {
+		body["valid"] = valid
+		body["invalid"] = invalid
+		jsonString, _ := json.Marshal(body)
+		out.String(string(jsonString))
+	} else {
+		body["error"] = err
+		jsonString, _ := json.Marshal(body)
+		out.String(string(jsonString))
+		os.Exit(exit.Failure)
+	}
 }
 
 func init() {
+	profileListCmd.Flags().StringVarP(&output, "output", "o", "table", "The output format. One of 'json', 'table'")
 	ProfileCmd.AddCommand(profileListCmd)
 }