shell 记录music的小程序

#!/bin/sh
menu_choice=""
current_cd=""
title_file="title.cdb"
tracks_file="tracks.cdb"
temp_file=/tmp/cdb.$$
trap 'rm -f $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 | Y | yes | Yes | YES )	
				return 0;;
			n | N | no | No | NO )	
				echo 
				echo "Cancelled"
				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"
	if [ "$cdcatmenu" != "" ]
	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
	cdtitle=""
	while [ "$cdtitle" != "q" ]
	do
		echo -e "Track $cdtrack, track title? \c"
		read tmp
		cdtitle=${tmp%%,*}
		if [ "$tmp" != "$cdtitle" ]
		then 
			echo "Sorry, no commas allowed"
			continue
		fi
		if [ -n "$cdtitle" ]
		then 
			if [ "$cdtitle" != "q" ]
			then 
				insert_track $cdcatmenu,$cdtrack,$cdtitle
			fi
		else
			cdtrack=$((cdtrack-1))
		fi
	cdtrack=$((cdtrack+1))
	done
}

add_records(){
	#Prompt for the initial information
	echo -e "Enter catalog name \c"
	read tmp
	cdcatmenu=${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%%,*}
	
	# Check that they want to enter the information
	
	echo About to add new entry
	echo "$cdcatmenu $cdtitle $cdtype $cdac"
	
	# If confirmed then append it to the titles file
	
	if get_confirm
	then
		insert_title $cdcatmenu,$cdtitle,$cdtype,$cdac
		add_record_tracks
	else
		remove_records*
	fi
	return
}

find_cd(){
	if [ "$1" = "n" ]
	then 
		asklist=n
	else
		asklist=y
	fi
	
	cdcatmenu=""
	echo -e "Enter a string to search for in the cd titles \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 cdcatmenu cdtitle cdtype cdac < $temp_file
	
	IFS=" "
	if [ -z "$cdcatnum" ]
	then
		echo "Sorry,could not extract catalog field from $temp_file"
		return 0
	fi
	
	echo 
	echo Catalog number: $cdcatnum
	echo Title: $cdtitle
	echo Type: $cdtype
	echo Artist/Composer:$cdac
	echo
	
	get_return
	
	if [ "$asklist" = "y" ]
	then 
		echo -e "View tracks for this CD \c"
			read x
		if [ "$x" = "y" ]
		then 
			echo 
			list_tracks
			echo
		fi
	fi
	return 1	
}

update_cd(){
	if [ -z "$cdcatmenu" ]
	then
		echo "You must select a CD first"
		find_cd n	
	fi
	
	if [ -n "$cdcatnum" ]
	then
		echo "Current tracks are :-"
		list_tracks
		echo
		echo "This will re-enter the tracks for $cdtitle"
		get_confirm && {
			grep -v "^${cdcatnum}," $tracks_file > $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 "$cdcatmenu" ]
	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 $title_file
			grep -v "^${cdcatnum}," $tracks_file > $temp_file
			mv $temp_file $tracks_file
			cdcatnum=""
			echo Entry removed
		}
		get_return
	fi 
	return 
}

list_tracks(){
	if [ "$cdcatnum" = "" ]
	then
		echo no CD select yet
		return
	else
		grep "^${cdcatnum}," $tracks_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 

# Now the application proper
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 y;;
		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

#Tidy up and leave
rm -f $temp_file
echo "Finished"
exit 0