Implement 'listaddresses' CLI command

cli.go

@@ -39,6 +39,15 @@ func (cli *CLI) getBalance(address string) {
 	fmt.Printf("Balance of '%s': %d\n", address, balance)
 }
 
+func (cli *CLI) listAddresses() {
+	wallets := NewWallets()
+	addresses := wallets.GetAddresses()
+
+	for _, address := range addresses {
+		fmt.Println(address)
+	}
+}
+
 func (cli *CLI) printUsage() {
 	fmt.Println("Usage:")
 	fmt.Println("  getbalance -address ADDRESS - Get balance of ADDRESS")
@@ -92,6 +101,7 @@ func (cli *CLI) Run() {
 	getBalanceCmd := flag.NewFlagSet("getbalance", flag.ExitOnError)
 	createBlockchainCmd := flag.NewFlagSet("createblockchain", flag.ExitOnError)
 	createWalletCmd := flag.NewFlagSet("createwallet", flag.ExitOnError)
+	listAddressesCmd := flag.NewFlagSet("listaddresses", flag.ExitOnError)
 	sendCmd := flag.NewFlagSet("send", flag.ExitOnError)
 	printChainCmd := flag.NewFlagSet("printchain", flag.ExitOnError)
 
@@ -117,6 +127,11 @@ func (cli *CLI) Run() {
 		if err != nil {
 			log.Panic(err)
 		}
+	case "listaddresses":
+		err := listAddressesCmd.Parse(os.Args[2:])
+		if err != nil {
+			log.Panic(err)
+		}
 	case "printchain":
 		err := printChainCmd.Parse(os.Args[2:])
 		if err != nil {
@@ -152,6 +167,10 @@ func (cli *CLI) Run() {
 		cli.createWallet()
 	}
 
+	if listAddressesCmd.Parsed() {
+		cli.listAddresses()
+	}
+
 	if printChainCmd.Parsed() {
 		cli.printChain()
 	}

wallet.go

@@ -120,6 +120,17 @@ func (ws *Wallets) LoadFromFile() error {
 	return nil
 }
 
+// GetAddresses returns an array of addresses stored in the wallet file
+func (ws *Wallets) GetAddresses() []string {
+	var addresses []string
+
+	for address := range ws.Wallets {
+		addresses = append(addresses, address)
+	}
+
+	return addresses
+}
+
 // NewWallets ...
 func NewWallets() *Wallets {
 	wallets := Wallets{}