examples: add nep5 mint function

Add Mint(...) to NEP5 for initial tokens supply.

examples/token/nep5/nep5.go

@@ -93,3 +93,19 @@ func IsUsableAddress(addr []byte) bool {
 
 	return false
 }
+
+// Mint initial supply of tokens.
+func (t Token) Mint(ctx storage.Context, to []byte) bool {
+	if !IsUsableAddress(t.Owner) {
+		return false
+	}
+	minted := storage.Get(ctx, []byte("minted")).(bool)
+	if minted {
+		return false
+	}
+
+	storage.Put(ctx, to, t.TotalSupply)
+	storage.Put(ctx, []byte("minted"), true)
+	runtime.Notify("transfer", "", to, t.TotalSupply)
+	return true
+}

examples/token/token.go

@@ -56,6 +56,10 @@ func Main(operation string, args []interface{}) interface{} {
 		amount := args[2].(int)
 		return token.Transfer(ctx, from, to, amount)
 	}
+	if operation == "mint" && CheckArgs(args, 1) {
+		addr := args[0].([]byte)
+		return token.Mint(ctx, addr)
+	}
 
 	return true
 }