from os import system

#remove pre- and postfix from url, mainly for pinging 
def shortenUrl(host):
    host = host.replace("udp://", "")
    host = host.replace("tcp://", "")
    host = host.replace("http://", "")
    host = host.replace("https://", "")
    host = host.replace("/announce", "")
    newHost = ""
    for letter in host:
        if letter == ":":
            break
        else:
            newHost = newHost + letter
    return(newHost)


def ping(host):
    if system(f"ping {host} -n 1") == 0:
        return True
    else:
        return False

f = open("input.txt", "r")
trackers = f.read()
f.close()

endList = []

for line in trackers.split():
    if line not in endList:
        url = shortenUrl(line)
        if ping(url) == True:
            endList.append(line)
            print(line + " " + "appended")
        else:
            print(line + " removed inactive tracker")
    else:
        print(line + " " + "removed duplicate")


newList = open("output.txt", "w")
for item in endList:
    newList.write(item + "\n")
newList.close()



input("successfully wrote file")