local filename = "tobuild"
rednet.open("left")
while true do
    id, message, protocol = rednet.receive()
    if protocol == "getnexttobuild" then
        file = fs.open(filename,"r")
        line = file.readLine()
        restof = file.readAll()
        file.close()
        file = fs.open(filename,"w")
        file.write(restof)
        file.close()
        print(line)
        rednet.send(id,line,"nexttobuild")
    elseif protocol == "failedtobuild" then
        print(message.."failed")
        file = fs.open(filename,"r")
        restof = file.readAll()
        file.close()
        file = fs.open(filename,"w")
        file.writeLine(message)
        file.write(restof)
        file.close()
    end
    --file = fs.open(filename,"r")
    --print(file.readAll())    
end