#!/bin/sh
#
#
# dining.sh
#
# Charles Duan
#
# Retrieves the dining menu.
#
#
#
# USAGE: dining.sh [MEAL [DATE]]
#
# Meal may be any one of the words breakfast, lunch, dinner, etc.; all the
# available meals should be printed out if a bad meal name is given. Date may be
# any date format allowable by the GNU strtotime function; typical values are
# "tomorrow", "next monday", or "Sept 12", all of which should work (given that
# menus exist for those days).
#
# If no arguments are given, it will guess which meal is next.
#
# This script has been revised to work with the new HUDS menu web page.
#

# Determine the current time, so we can autodetect the meal.
HOUR=`date +%H`
DAY=`date +%w`

# Determine which meal to use.
if [ "$1" ] ; then
    case "$1" in
	breakfast|lunch|dinner|pasta|grill|deli|salad)
	    MEAL=$1
	    ;;
	*)
	    echo "Usage: `basename $0` [MEAL [DATE]]"
	    echo 'MEAL is breakfast|lunch|dinner|pasta|grill|deli|salad'
	    exit
	    ;;
    esac

else
    if [ $DAY -eq 0 ] ; then		# If it's Sunday, only lunch and dinner
	if [ $HOUR -le 13 ] ; then
	    MEAL='lunch'
	else
	    MEAL='dinner'
	fi
    else
	if [ $HOUR -le 9 ] ; then
	    MEAL='breakfast'
	else
	    if [ $HOUR -le 13 ] ; then
		MEAL='lunch'
	    else
		MEAL='dinner'
	    fi
	fi
    fi
fi


# Determine the locationNum for the meal type
case "$MEAL" in
    pasta|grill)
	LOCAT=08
	;;
    deli|salad)
	LOCAT=15
	;;
    *)
	LOCAT=05
	;;
esac

# If there's a date argument, then reformat the date into mm/dd/yyyy. $DATE will
# contain the GET request specifier for the URL, preceded by an ampersand.
if [ "$2" ] ; then
    DATE="&dtdate=`date +"%m/%d/%Y" "-d$2"`"
else
    DATE=""
fi

# Print out a header line.
case "$HOST" in
    is??)
	echo "\033[1m$MEAL menu\033[0m"
	;;
    *)
	echo -e "\033[1m$MEAL menu\033[0m"
	;;
esac

echo ''

if [ "$ISTYPE" = ws ] ; then
    DOS2UNIX="sed s/.$//"
else
    DOS2UNIX=dos2unix
fi


# PRE_MEAL and POST_MEAL are prepended and appended to the meal name, for the
# purposes of regular expression matching.
PRE_MEAL='<font face="arial" color=#006400 size="3"><b>.*'
POST_MEAL='.*<\/b><\/font>'

# PAGE is the web page to download. OPTIONS is all of the GET specifications for
# the page.
PAGE="http://www.huds.harvard.edu/foodpro/menusamp.asp"
OPTIONS="myaction=read&locationNum=$LOCAT$DATE"

# Retrieve the menu. I wish I could comment inside it, but I can't...
# The way it works is as follows:
#
# 1. Get the page via WGET to STDOUT
# 2. dos2unix it (remove ^M)
# 3. Transpose the meal name to lowercase
# 4. Delete everything from the first line to $PRE_MEAL$MEAL$POST_MEAL
# 5. Delete everything from the end marker (</table>) to EOF
# 6. Get rid of HTML tags
# 7. Get rid of empty lines
#
wget -qO- "$PAGE?$OPTIONS" \
    | $DOS2UNIX \
    | sed -e "s/$MEAL/$MEAL/gi" \
	  -e "s/&nbsp;/ /g" \
          -e "1,/$PRE_MEAL$MEAL$POST_MEAL/d" \
	  -e "/$PRE_MEAL/,\$d" \
	  -e 's/<[^>]*>//g' \
	  -e 's/^[	 ]\+//;/^$/d' \
	  -e '/^--.*--$/d' \
	  -e '/Powered by FoodPro/d'

echo ''