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/usr/share/weechat/python/update_notifier.py is in weechat-scripts 20131007-1.

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The actual contents of the file can be viewed below.

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# -*- coding: utf-8 -*-
#
# Copyright (c) 2010-2010 by drubin <drubin at smartcube.co.za>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


# Allows you to visually see if there are updates to your weechat system

#Versions
# 0.4 drubin  - changed default weechat hostname
# 0.3 nils_2  - third release.
#             - *fixed bug* every time the item_bar was updated, script did a read access to homepage
#             - get python 2.x binary for hook_process (fix problem when python 3.x is default python
#               version, requires WeeChat >= 0.3.4)
#             - new option "git pull". executes "git pull" if "true" and a new git version is available
# 0.2 nils_2  - second release.
#             - countdown to next stable release added.
#             - now using hook_signal(day_changed) instead of hook_timer()
#             └-> option "update_interval" is obsolet now.
#             - hook_config() added.
#             - type missmatched removed if git_compile_location wasn't set
# 0.1 drubin - First release.
#            - Basic functionality with url getting and compairing version.

SCRIPT_NAME    = "update_notifier"
SCRIPT_AUTHOR  = "drubin <drubin at smartcube.co.za>"
SCRIPT_VERSION = "0.4"
SCRIPT_LICENSE = "GPL3"
SCRIPT_DESC    = "Notifiers users of updates to weechat."

import_ok = True
import os
from time import *
try:
    import weechat
except ImportError:
    print "This script must be run under WeeChat."
    print "Get WeeChat now at: http://www.weechat.org/"
    import_ok = False
    
    
# script options
settings = {
    "uses_git"                  : "false",
    "uses_devel"                : "false",
    "git_pull"                  : "false",
    "git_compile_location"      : "",
    "update_text"               : "New devel version available",
    "update_text_stable"        : "New stable version %s available",
    "start_counting"            : "30",
    "start_countdown"           : "10",
    "next_stable_text"          : "%d day(s) left to version %s",
    "color_default"             : "default",
    "color_countdown"           : "red",
}

infos = ["stable","stable_number","git","next_stable","next_stable_number","next_stable_date"]

#Not a config because it should not change ever
BASE_URL = "http://www.weechat.org/info/"
BAR_NAME = "updnotf"

#List of proccesses
un_hook_process = {}

#How long to wait for download
TIMEOUT_DOWNLOAD = 60 * 1000

def un_cache_dir():
    filename =  weechat.info_get("weechat_dir", "") + os.sep+ SCRIPT_NAME
    if not os.path.isdir(filename):
        os.makedirs(filename, mode=0700)
    return filename
    
def get_version(isnumber = False):
    """Gets the version number of weechat, both number and string"""
    if isnumber:
        return weechat.info_get("version_number", "")
    else:
        return weechat.info_get("version", "")
        
def full_file_name(filename):
     path = un_cache_dir() + os.sep + filename
     return path

def un_timer_cache(date,remaning,dropit):
    un_update_cache()
    return weechat.WEECHAT_RC_OK 


def un_update_cache():
    for info in infos:
        un_download_url(BASE_URL+info,info)
    """ Callback for building update item. """
    version = get_version()
    version_num = get_version(True)
    compare_version = ""
    compare_version_num = ""
    update_avaliable = False
    global next_stable_text
    next_stable_text = ""

# check for stable version first
    start_counting = weechat.config_get_plugin("start_counting")
    if start_counting != "":
        next_stable_date = get_info_ver("next_stable_date")
        lt = localtime()
        year, month, day = lt[0:3]				# today
        next_stable_date = next_stable_date.split("-")		# next_stable_date
        next_stable_date = int(next_stable_date[0]),int(next_stable_date[1]),int(next_stable_date[2]),0,0,0,0,0,0
        next_stable_date = mktime(next_stable_date)
        today = year,month,day, 0, 0, 0, 0, 0, 0
        today = mktime(today)
        diff_day = (next_stable_date - today)/60/60/24		# calculate days till next_stable_date
        diff_day = "%1i" % (diff_day)

#        diff_day = 0						# test to pop up new stable text
        if (int(diff_day) > 0) and (int(diff_day) <= int(start_counting)):
	  used_color = weechat.config_get_plugin("color_default")
	  if (int(diff_day) <= int(weechat.config_get_plugin("start_countdown"))):		# TEN and counting....
	    used_color = weechat.config_get_plugin("color_countdown")
        
	  next_stable_text = weechat.config_get_plugin("next_stable_text")
	  next_stable = get_info_ver("next_stable")
	  if next_stable_text == "":
	    next_stable_text = ("days left:" + weechat.color(used_color) + "%d" + weechat.color("reset") + " to stable: %s") % (int(diff_day),next_stable)
	  else:
	    next_stable_text = next_stable_text.replace("%d", weechat.color(used_color) + "%d" + weechat.color("reset"))
	    if next_stable_text.find("%s") >= 1:		# check for %s
	      next_stable_text = next_stable_text % (int(diff_day),next_stable)
	    else:
	      next_stable_text = next_stable_text % int(diff_day)
	    update_avaliable = False
        elif (int(diff_day) <= 0):				# today a new stable version is available
          stable_number = get_info_ver("stable")
          next_stable_text = weechat.config_get_plugin("update_text_stable")
          if next_stable_text.find("%s") >= 1:			# %s in string?
	    next_stable_text = (next_stable_text % stable_number)
	  return next_stable_text				# new stable version

    if weechat.config_get_plugin("uses_devel") == "true":
        compare_version_num = get_info_ver("next_stable_number")
        compare_version = get_info_ver("next_stable")
        update_avaliable = int(compare_version_num) > int(version_num)
    elif weechat.config_get_plugin("uses_git") == "true":
        git_cur = get_cur_git_version()
        if git_cur != False:				# path to git dir exists?
	  git_ver = get_info_ver("git")			# yes
          compare_version = git_cur
          update_avaliable = get_cur_git_version() != git_ver
          if update_avaliable != False:
	    do_git_pull()				# call git pull
        else:
	  update_avaliable = False
    else:
        compare_version_num = get_info_ver("stable_number")
        compare_version = get_info_ver("stable")
        update_avaliable = int(compare_version_num) > int(version_num)
        
    if update_avaliable:
      next_stable_text = weechat.config_get_plugin("update_text")
      return next_stable_text
    else:
      if next_stable_text != "":
        return next_stable_text
      else:
	next_stable_text = ""
	return next_stable_text

        
def get_cur_git_version():
    path = weechat.config_get_plugin("git_compile_location")
    if path != "":
      f = os.popen("cd %s && git rev-parse HEAD" % path)
      stuff = f.readline()
      f.close()
      return stuff.strip()
    else:
      return False

def do_git_pull():
  if (weechat.config_get_plugin("git_pull") == "false"):
    return
  path = weechat.config_get_plugin("git_compile_location")
  if path != "":
    f = os.popen("cd %s && git pull 2>&1" % path)
    stuff = f.readline()
    weechat.prnt("",weechat.prefix("action") + weechat.color(weechat.config_color(weechat.config_get("weechat.color.chat_nick_self"))) + SCRIPT_NAME + ":")
    weechat.prnt("",stuff)
    f.close()
      
def get_info_ver(info):
    filecontents = file(full_file_name(info)).read().strip()
    return filecontents      

def un_download_url(url, filename):
    pathfile = full_file_name(filename)
    python2_bin = weechat.info_get("python2_bin", "") or "python"
    un_hook_process[filename] = weechat.hook_process(
        python2_bin + " -c \"import urllib, urllib2\n"
        "req = urllib2.Request('" + url + "')\n"
        "try:\n"
        "    response = urllib2.urlopen(req)\n"
        "    file = open('" + pathfile + "', 'w')\n"
        "    file.write(response.read())\n"
        "    response.close()\n"
        "    file.close()\n"
        "except urllib2.URLError, e:\n"
        "    print 'error:%s' % e.code\n"
        "\"",
        TIMEOUT_DOWNLOAD, "un_download_cb", filename)

def un_download_cb(filename, command, rc, stdout, stderr):
    un_hook_process[filename] = ""
    #Update configs..
    weechat.bar_item_update(BAR_NAME)
    return weechat.WEECHAT_RC_OK
    
def up_item_cb(data, buffer, args):
  return next_stable_text

def un_cmd(data, buffer, args):
    un_update_cache()

    return weechat.WEECHAT_RC_OK

if weechat.register(SCRIPT_NAME, SCRIPT_AUTHOR, SCRIPT_VERSION, SCRIPT_LICENSE,
                    SCRIPT_DESC, "", ""):
    for option, default_value in settings.iteritems():
        if weechat.config_get_plugin(option) == "":
	  if option != "start_counting":
            weechat.config_set_plugin(option, default_value)
            
    weechat.hook_command("upgrade_check", "Checks for upgrades", "",
                         "",
                         "", "un_cmd", "")        
            
            
    weechat.bar_item_new(BAR_NAME, 'up_item_cb', '')
    weechat.hook_signal("day_changed","un_timer_cache","")
    weechat.hook_config("plugins.var.python." + SCRIPT_NAME + ".*", "un_timer_cache", "")
    #Update the cache when it starts up.
    un_update_cache()