Implement custom go format for list command

Signed-off-by: Anders F Björklund <anders.f.bjorklund@gmail.com>

Author: afbjorklund

cmd/limactl/list.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"text/tabwriter"
+	"text/template"
 
 	"github.com/docker/go-units"
 	"github.com/lima-vm/lima/pkg/store"
@@ -22,6 +23,7 @@ func newListCommand() *cobra.Command {
 		ValidArgsFunction: cobra.NoFileCompletions,
 	}
 
+	listCommand.Flags().StringP("format", "f", "", "Format the output using the given Go template")
 	listCommand.Flags().Bool("json", false, "JSONify output")
 	listCommand.Flags().BoolP("quiet", "q", false, "Only show names")
 
@@ -33,6 +35,10 @@ func listAction(cmd *cobra.Command, args []string) error {
 	if err != nil {
 		return err
 	}
+	goFormat, err := cmd.Flags().GetString("format")
+	if err != nil {
+		return err
+	}
 	jsonFormat, err := cmd.Flags().GetBool("json")
 	if err != nil {
 		return err
@@ -41,6 +47,9 @@ func listAction(cmd *cobra.Command, args []string) error {
 	if quiet && jsonFormat {
 		return errors.New("option --quiet conflicts with --json")
 	}
+	if goFormat != "" && jsonFormat {
+		return errors.New("option --format conflicts with --json")
+	}
 
 	instances, err := store.Instances()
 	if err != nil {
@@ -54,6 +63,25 @@ func listAction(cmd *cobra.Command, args []string) error {
 		return nil
 	}
 
+	if goFormat != "" {
+		tmpl, err := template.New("format").Parse(goFormat)
+		if err != nil {
+			return err
+		}
+		for _, instName := range instances {
+			inst, err := store.Inspect(instName)
+			if err != nil {
+				logrus.WithError(err).Errorf("instance %q does not exist?", instName)
+				continue
+			}
+			err = tmpl.Execute(cmd.OutOrStdout(), inst)
+			if err != nil {
+				return err
+			}
+			fmt.Fprintln(cmd.OutOrStdout())
+		}
+		return nil
+	}
 	if jsonFormat {
 		for _, instName := range instances {
 			inst, err := store.Inspect(instName)