import os
import re

class CmdUpdate:
    def __init__(self, config):
        self.config = config
    
    def execute(self):
        print("Updating...")
        stream = os.popen("crontab -l")
        crontab = stream.read()
        result = crontab
        begin = re.search("\s*#\s*BEGIN\(ALERTS\).*", crontab)
        if begin:
            fragment = ""
            with open(self.config["CronFragment"]) as file:
                fragment = file.read()
            
            result = crontab[:begin.span()[1]] + "\n"
            result += fragment

            end = re.search("\s*#\s*END\(ALERTS\).*", crontab)
            if end:
                result += crontab[end.span()[0]:]
        
        print(result)