#!/bin/sh

SHED_FILE="/tmp/ifmo.shedule"

if [ ! -e $SHED_FILE ]; then
    echo "File: $SHED_FILE not exist..."
    exit 1
fi

CURR_WEEKDAY=`date +%A`
NEXT_WEEKDAY=`date -d "tomorrow" +%A`

if [ "$CURR_WEEKDAY" == "Воскресенье" ]; then
    echo 'Гуляй, студент!'
    exit 0
fi

START_LINE=`cat $SHED_FILE | awk '/'$CURR_WEEKDAY'/{print NR}'`
START_LINE=`echo "$START_LINE-1" | bc -l`

if [ "$NEXT_WEEKDAY" == "Воскресенье" ]; then
    STOP_LINE=`wc -l $SHED_FILE | awk '{print $1}'`
else
    STOP_LINE=`cat $SHED_FILE | awk '/'$NEXT_WEEKDAY'/{print NR}'`
    STOP_LINE=`echo "$STOP_LINE-1" | bc -l`
fi

head -n 1 $SHED_FILE
echo

cat $SHED_FILE | awk '{if((NR >='"$START_LINE"') && (NR <='""$STOP_LINE')) print $0}'