feat: add the whoami command

The whoami command shows the user the name of the account they are
currently logged in to.

cmd/enbas/main.go

@@ -28,6 +28,7 @@ func run() error {
 		createResource string = "create"
 		deleteResource string = "delete"
 		updateResource string = "update"
+		whoami         string = "whoami"
 	)
 
 	summaries := map[string]string{
@@ -38,6 +39,7 @@ func run() error {
 		createResource: "create a specific resource",
 		deleteResource: "delete a specific resource",
 		updateResource: "update a specific resource",
+		whoami:         "print the account that you are currently logged in to",
 	}
 
 	flag.Usage = enbasUsageFunc(summaries)
@@ -70,6 +72,8 @@ func run() error {
 		executor = newDeleteCommand(deleteResource, summaries[deleteResource])
 	case updateResource:
 		executor = newUpdateCommand(updateResource, summaries[updateResource])
+	case whoami:
+		executor = newWhoAmICommand(whoami, summaries[whoami])
 	default:
 		flag.Usage()
 		return fmt.Errorf("unknown subcommand %q", subcommand)

cmd/enbas/whoami.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+
+	"codeflow.dananglin.me.uk/apollo/enbas/internal/config"
+)
+
+type whoAmICommand struct {
+	*flag.FlagSet
+}
+
+func newWhoAmICommand(name, summary string) *whoAmICommand {
+	command := whoAmICommand{
+		FlagSet: flag.NewFlagSet(name, flag.ExitOnError),
+	}
+
+	command.Usage = commandUsageFunc(name, summary, command.FlagSet)
+
+	return &command
+}
+
+func (c *whoAmICommand) Execute() error {
+	config, err := config.NewAuthenticationConfigFromFile()
+	if err != nil {
+		return fmt.Errorf("unable to load the credential config; %w", err)
+	}
+
+	fmt.Printf("You are %s\n", config.CurrentAccount)
+
+	return nil
+}