#!/bin/bash

# number of student group
GROUP="3101"
URL="http://www.ifmo.ru/file/schedule.php?gr="$GROUP
SHEDFILE="/tmp/ifmo.shedule"

while :; do
    # check internet connection
    while :; do
        ping -W 10 -c1 cde.ifmo.ru &>/dev/null
        if [ "$?" -eq "0" ]; then
            break;
        fi
        sleep 60
    done

    w3m -I CP1251 -dump $URL > $SHEDFILE.tmp 2>/dev/null
    if [ "$?" -ne "0" ]; then
        rm $SHEDFILE.tmp &> /dev/null
        if [ "$?" -ne "0" ]; then
            exit 1;
        fi
    else
        mv $SHEDFILE.tmp $SHEDFILE &> /dev/null
        if [ "$?" -ne "0" ]; then
            exit 1;
        fi
        chmod go+r $SHEDFILE
        if [ "$?" -ne "0" ]; then
            exit 1;
        fi
    fi
    # sleep 1 day
    sleep 86400
    if [ "$?" -ne "0" ]; then
        exit 1;
    fi
done