CD管理程序

#!/bin/sh
# Very simple example shell script for managing a CD collection.
# Copyright (C) 1996-2003 Wrox Press.
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
# This program is distributed in the hopes that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.
# 675 Mass Ave, Cambridge, MA 02139, USA.


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 | yes | Y | Yes | YES )
          return 0;;
       n | no | N | 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 [ "$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() {
  # Prompt for the initial information
  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%%,*}
  # Check that they want to enter the information
  echo About to add new entry
  echo "$cdcatnum $cdtitle $cdtype $cdac"
  # If confirmed then append it to the titles file
  if get_confirm ; then
     insert_title $cdcatnum,$cdtitle,$cdtype,$cdac
     add_record_tracks
  else
     remove_records
  fi
  return
}


find_cd() {
  if [ "$1" = "n" ]; then
     asklist=n
  else
     asklist=y
  fi
  cdcatnum=""
  echo -e "Enter a string to search for in the CD titles \c"
  read searchstr
  if [ "$searchstr" = "" ]; then
     return 0
  fi
  grep "$searchstr" $title_file > $temp_file
  set $(wc -l $temp_file)
  linesfound=$l
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 < $temp_file
IFS=" "
if [ -z "$cdcatnum" ]; then
   echo "Sorry, could not extract catalog field from $temp_file"
   get_return
   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 "$cdcatnum" ]; then
    echo "You must select a CD first"
    find_cd n
 fi
  if [ -n "$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 $title_file)
  num_titles=$l
  set $(wc -l $tracks_file)
  num_tracks=$l
  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 $title_file
       grep -v "^${cdcatnum}," $tracks_file > $temp_file
       mv $temp_file $tracks_file
       cdcatnum=""
       echo Entry removed
     }
     get_return
  fi
  return
}


list_tracks() {
  if [ "$cdcatnum" = "" ]; then
     echo no CD selected yet
     return
  else
     grep "^${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