add: Implement -q option

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -17,26 +18,34 @@ func dumpRegisters(emu *emulator.Emulator) {
 }
 
 func main() {
-	if len(os.Args) < 2 {
+	quiet := flag.Bool("q", false, "Quiet mode enabled?")
+	flag.Parse()
+	argv := flag.Args()
+	if len(argv) < 1 {
 		fmt.Println("few arguments")
 		os.Exit(1)
 	}
-	filename := os.Args[1]
+	filename := argv[0]
+
 	emu := emulator.NewEmulator(emulator.MemorySize, 0x7c00, 0x7c00)
 	if emu == nil {
 		fmt.Println("Error: Value of eip or esp is invalid")
 		os.Exit(1)
 	}
+
 	binary, err := os.Open(filename)
 	if err != nil {
 		panic(err)
 	}
 	defer binary.Close()
+
 	mem, err := ioutil.ReadAll(binary)
 	emu.Memory = append(emu.Memory[:0x7c00], mem...)
 	for emu.Eip < emulator.MemorySize {
 		var code byte = emulator.GetCode8(emu, 0)
-		fmt.Printf("EIP = %X, Code = %02X\n", emu.Eip, code)
+		if !*quiet {
+			fmt.Printf("EIP = %X, Code = %02X\n", emu.Eip, code)
+		}
 		operator, err := emulator.Instructions(code)
 		if err != nil {
 			panic(err)