#/bin/sh



menu_choice=""

current_cd=""

title_file="title.cdb"

tracks_file="tracks.cdb"

temp_file=/tmp/cdb.$$

trap `rm -rf $temp_file` EXIT





get_return()

{

	echo -e "Press return.c"

	read x

	return 0;

}



get_confirm()

{

	echo -e "Are you sure?c"

	while true

	do

		read x

		case "$x" in

			y | yes | Y | Yes | YES )

			return 0;;

			n | no | N | No | NO )

			return 1;;

			* )

			echo "Please enter yes or no";;

		esac

	done

}



set_menu_choice()

{

	clear

	echo "Options :-"

	echo

	echo "	a) Add new CD"

	echo "	f) Find CD"

	echo "	c) Count the CDs and tracks in the catalog"

# $cdcatnum 不是全局变量，这个 if 结构里应该永远走不进吧，但实际进了，为啥？

	if [ "$cdcatnum" != "" ]; then

		echo "	l) List tracks on $cdtitle"

		echo "	r) Remove $cdtitle"

		echo "	u) Update track information for $cdtitle"

	fi



	echo "	q) Quit"

	echo

	echo -e "Please enter choice then press return c"

	read menu_choice

	return

}



insert_title()

{

	echo $* >> $title_file

	return

}



insert_track()

{

	echo $* >> $tracks_file

	return

}



add_record_tracks()

{

	echo "Enter track information for this CD"

	echo "When no more tracks enter q"

	cdtrack=1

	cdttitle=""

	while [ "$cdttitle" != "q" ]

	do

		echo -e "Track $cdtrack,track title?c"

		read tmp

		cdttitle=${tmp%%,*}

		if [ "$tmp" != "$cdttitle" ];

		then

			echo "Sorry, no commas allowed"

			continue

		fi



		if [ -n "$cdttitle" ]; then

			if [ "$cdttitle" != "q" ]; then

				insert_track $cdcatnum,$cdtrack,$cdttitle

			fi

		else

			cdtrack=$((cdtrack-1))

		fi



		cdtrack=$((cdtrack+1))

	done

}



add_records()

{



	echo -e "Enter catalog name c"

	read tmp

	cdcatnum=${tmp%%,*}



	echo -e "Enter title c"

	read tmp

	cdtitle=${tmp%%,*}



	echo -e "Enter type c"

	read tmp

	cdtype=${tmp%%,*}



	echo -e "Enter artist/composer c"

	read tmp

	cdac=${tmp%%,*}





	echo About to add new entry

	echo "$cdcatnum $cdtitle $cdtype $cdac"





	if get_confirm ;then

		insert_title $cdcatnum,$cdtitle,$cdtype,$cdac

		add_record_tracks

	else

		remove_records

	fi

	return

}



find_cd()

{

	if [ "$1" = "n" ]; then

		asklist=n

	else

		saklist=y

	fi



	cdcatnum=""

	echo -e "Enter a string to search for in the CD title c"

	read searchstr

	if [ "$searchstr" = "" ]; then

		return 0;

	fi



	grep "$searchstr" $title_file > $temp_file



	set $(wc -l $temp_file)



	linesfound=$1



	case "$linesfound" in

		0)	echo "Sorry, nothing found"

			get_return

			return 0;;

		1)	;;

		2)	echo "Sorry, not unique."

			echo "Found the following"

			cat $temp_file

			get_return

			return 0;;

		esac



		IFS=","

		read cdcatnum cdtitle cdtype cdac  $temp_file

	mv $temp_file $tracks_file

	echo

	add_record_tracks

	}

fi

		return

}



count_cds()

{

	set $(wc -l $title_file)

	num_titles=$1

	set $(wc -l $tracks_file)

	num_tracks=$1

	echo found $num_titles CDs, with a total of $num_tracks tracks

	get_return

	return

}



remove_records()

{

	if [ -z "$cdcatnum" ]; then

		echo You must select a CD first

		find_cd n

	fi



	if [ -n "$cdcatnum" ]; then

		echo "You are about to delete $cdtitle"

		get_confirm && {

		grep -v "^${cdcatnum}," $title_file > $temp_file

		mv $temp_file $tiele_file

		cdcatnum=""

		echo Entry removed

	}

get_return

fi

return

}



list_tracks()

{

	if [ "$cdcatnum" = "" ]; then

		echo no CD selected yet

		return

	else

		grep "^${cdcatnum}," $tarcls_file > $temp_file

		num_tracks=$(wc -l $temp_file)



		if [ "$num_tracks" = "0" ]; then

			echo no tracks found for $cdtitle

		else

			{

				echo

				echo "$cdtitle :-"

				echo

				cut -f 2- -d , $temp_file

				echo

			} | ${PAGER:-more}

		fi

	fi

	get_return

	return

}





# 

rm -f $temp_file

if [ ! -f $title_file ]; then

	touch $title_file

fi



if [ ! -f $tracks_file ]; then

	touch $tracks_file

fi





clear

echo

echo

echo "Mini CD manager"

sleep 1

quit=n



while [ "$quit" != "y" ];

do

	set_menu_choice

	case "$menu_choice" in

		a)	add_records;;

		r)	remove_records;;

		f)	find_cd;;

		u)	update_cd;;

		c)	count_cds;;

		l)	list_tracks;;

		b)

			echo

			more $title_file

			echo

			get_return;;

		q | Q)	quit=y;;

		*)	echo "Sorry,choice not recognized";;

	esac

done





rm -f $temp_file

echo "Finished"

exit 0;

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