This assignment requires you to write a portion of the self-service ticketing kiosk for a cinema using the bourne-again shell (bash). The self-service ticketing system will allow the public to check the availability of the cinema tickets for a particular movie and choose their own seating in the theatre as well as to purchase tickets themselves. A suggested interactive ticketing menu with color can be as follows:
Choice 1 of the main menu will provide a list of all the movies and show times the theatre are screening. The list of movies can be populated from a flat file. Below is a sample of the file format with comma as the delimiter. You can add in extra fields if required.
|
A |
B |
C |
D |
E |
| 1 |
X |
|
|
|
|
| 2 |
|
X |
X |
|
|
| 3 |
|
|
X |
X |
X |
| 4 |
|
X |
X |
X |
X |
Total ticket(s) price for 2 tickets is $10
To confirm your seats in Marked in Blue, press Y or N:
Y
For both fast and manual booking, the ticketing system can also compute the total price chargeable as shown above.
Choice 4 will allow customer to search by show times or by movie title. For instance, the customer might like to find out what movies are there screening at 19:00. You can use commands like egrep or grep coupled with regular expressions such as ^, $, [] etc. to search through the records.
You will need to create a file system so that the system will know the seat vacancies for the different movies at different show times. Some entries validation is required to check if the seat number entered is valid or available for sales.
In your shell program, you can use commands such as echo, grep, awk, cut, >>, read, expr, sort etc. to store, locate, display, remove and sort. If else control structure, case structure, while and for loop can be incorporated as well.
Execution of your program would be as follows:
$bash ticketing.sh or $ticketing.sh
labHint2.sh
#display main ticketing menu
display_menu()
{
# Called by run_menu
echo
echo “– Theatre’s Self-service Ticketing –”
echo -n “1. ”
echo -e ‘\E[1;32;40mList all Movies and Show time\E[0m’
echo -n “2. ”
echo -e ‘\E[1;32;40mDisplay theatre’s seat \E[0m’
echo -n “q. ”
echo -e ‘\E[1;31;47mQuit\E[0m’
echo -en “Enter your selection: ”
}
# List out available movies
list_movies()
{
# Called by run_menu
old_IFS=$IFS
IFS=$’\n’
print_movie_header
for LINE in `sed -e ‘s/Yes/Ticket Available/g’ -e ‘s/No/SOLD OUT/g’ movielist.txt`
do
print_movie $LINE
done
IFS=$old_IFS
}
# Output header for movie listing
# Catered for both numbered and non-numbered list
print_movie_header()
{
echo -e ‘\E[1;32;40m’
if [ $# == “1” ];then
echo -n ” ”
fi
echo -n -e ‘Movie Title’
set_colwidth ‘Movie Title’ 25
echo -n -e ‘Show Time\t’
if [ $# == “1” ];then
echo -n -e “\t”
fi
echo -n ‘Vacancy’
echo -e ‘\E[0m’
}
# Set the width of column
# $1 is the text in the column
# and $2 is the intended column width
set_colwidth()
{
STRING=$1
LENGTH=${#STRING}
for (( i=$LENGTH; i<=$2; i++))
do
echo -n ” ”
done
}
# Output movie entry
print_movie()
{
TIME=`echo $1 | cut -f1 -d “,”`
TITLE=`echo $1 | cut -f2 -d “,”`
AVAILABLE=`echo $1 | cut -f3 -d “,”`
echo -n -e $TITLE
set_colwidth $TITLE 25
echo -n -e $TIME ‘\t’
echo $AVAILABLE
}
# Hint2
# Get current seating arrangement of
# selected movie from seating.txt
movie_data()
{
COUNT=1
old_IFS=$IFS
IFS=$’\n’
for LINE in `cat seating.txt`
do
if test $1 -eq $COUNT
then
display_seats $LINE $2
fi
THEATER[$COUNT]=$LINE
let COUNT=COUNT+1
done
IFS=$old_IFS
}
# Mark occupied seat with a X and
# seats selected by user with a red X
mark_seat()
{
# Called by display_seats
if [ $(echo “$1” | grep -c “$2$3”) -gt 0 ]
then
echo -n “X”
set_colwidth “” 5
elif [ $(echo “$4” | grep -c “$2$3”) -gt 0 ]
then
echo -en ‘\E[1;31mX\E[0m’
set_colwidth “” 5
else
set_colwidth “” 6
fi
}
# Print out theater’s seating arrangement
display_seats()
{
COL=5
ROW=4
echo
echo “—————————————”
echo -e ‘\E[1;34;47m—————-SCREEN—————–\E[0m’
echo “—————————————”
for (( x=0; x<=$ROW; x++))
do
echo -n “$x” | tr “0” ” ”
for (( j=0; j<=$COL; j++))
do
if [ $x == “0” ]
then
echo -n $j | tr “012345” ” ABCDE”
set_colwidth “” 5
else
CURR_COL=$(echo $j | tr “12345” “ABCDE”)
if [ $j == “0” ]
then
set_colwidth “” 6
else
mark_seat $1 $CURR_COL $x $2
fi
fi
done
echo “”
done
echo “—————————————”
}
# Select and book seat manually
select_seat()
{
# Called by run_menu
COUNT=0
echo
echo “– Select A Seat Manually –”
echo
old_IFS=$IFS
IFS=$’\n’
print_movie_header “numbered”
for LINE in `sed -e ‘s/Yes/Ticket Available/g’ -e ‘s/No/SOLD OUT/g’ movielist.txt `;do
let COUNT=COUNT+1
echo -n “$COUNT. ”
print_movie $LINE
done
IFS=$old_IFS
echo
# Select movie to book
echo -en “Select Movie To Book (Enter 1 to ${COUNT}): ”
read NUM
NUMERIC=0
while [ “$NUMERIC” != “1” ];do
for (( x=$COUNT; x>=1; x–))
do
if [ $NUM == “$x” ];then
NUMERIC=1
fi
done
if [ “$NUMERIC” != “1” ];then
echo -en “Invalid Movie Selected, Try Again (Enter 1 to ${COUNT}): ”
read NUM
fi
done
movie_data $NUM
echo
old_IFS=$IFS
IFS=$’\n’
echo
}
# Main menu navigation
run_menu()
{
i=-1
while [ “$i” != “q” ]; do
display_menu
read i
i=`echo $i | tr ‘[A-Z]’ ‘[a-z]’`
case “$i” in
“1”)
list_movies
;;
“2”)
select_seat
;;
“q”)
echo “GoodBye, Have A Nice Day”
exit 0
;;
*)
echo “Unrecognised Input.”
;;
esac
done
}
#———————————————-#
# ———PROGRAM SCRIPT START HERE———- #
#———————————————-#
if [ ! -f movielist.txt ]; then
echo “Error: Movie list is not available”
fi
run_menu
Solution
declare -a THEATER
#display main ticketing menu
display_menu()
{
# Called by run_menu
echo
echo -e ” \E[1;37;100m — Theatre’s Self-service Ticketing — \E[0m”
echo
echo -n “1. ”
echo -e ‘\E[1;32;40mList all Movies and Show time \E[0m’
echo -n “2. ”
echo -e ‘\E[1;32;40mFast booking \E[0m’
echo -n “3. ”
echo -e ‘\E[1;32;40mSelect theatre’s seat manually \E[0m’
echo -n “4. ”
echo -e ‘\E[1;32;40mSearch by Screening times or by Movie title \E[0m’
echo -n “q. ”
echo -e ‘\E[1;31;47mQuit \E[0m’
echo -en “Enter your selection: ”
}
# List out available movies
list_movies()
{
# Called by run_menu
echo
echo “– Theatre’s Screening Movies –”
echo
old_IFS=$IFS
IFS=$’\n’
print_movie_header
for LINE in `sed -e ‘s/Yes/Ticket Available/g’ -e ‘s/No/SOLD OUT/g’ movielist.txt`
do
print_movie $LINE
done
IFS=$old_IFS
}
filter_movies()
{
# Called by run_menu
echo
echo “– Search Theatre’s Screening Movies –”
echo
echo -e “1. Search by show times”
echo -e “2. Search by movie title”
echo -en “Select search option (Enter 1 or 2): ”
read opt
if [ “$opt” == “1” ]; then
pattern_beg=’^’
pattern_end=’,’
echo -en “Enter the show time: ”
else
pattern_beg=’,’
pattern_end=’,’
echo -en “Enter movie title: ”
fi
read search
pattern=$pattern_beg$search$pattern_end
old_IFS=$IFS
IFS=$’\n’
print_movie_header
for LINE in `sed -e ‘s/Yes/Ticket Available/g’ -e ‘s/No/SOLD OUT/g’ movielist.txt | grep $pattern`
do
print_movie $LINE
done
IFS=$old_IFS
}
# Output header for movie listing
# Catered for both numbered and non-numbered list
print_movie_header()
{
echo -e ‘\E[1;32;40m’
if [ $# == “1” ];then
echo -n ” ”
fi
echo -n -e ‘Movie Title’
set_colwidth ‘Movie Title’ 25
echo -n -e ‘Show Time\t’
if [ $# == “1” ];then
echo -n -e “\t”
fi
echo -n ‘Vacancy’
echo -e ‘\E[0m’
}
# Set the width of column
# $1 is the text in the column
# and $2 is the intended column width
set_colwidth()
{
STRING=$1
LENGTH=${#STRING}
for (( i=$LENGTH; i<=$2; i++))
do
echo -n ” ”
done
}
# Output movie entry
print_movie()
{
TIME=`echo $1 | cut -f1 -d “,”`
TITLE=`echo $1 | cut -f2 -d “,”`
AVAILABLE=`echo $1 | cut -f3 -d “,”`
echo -n -e $TITLE
set_colwidth $TITLE 25
echo -n -e $TIME ‘\t’
echo $AVAILABLE
}
read_movie_data()
{
COUNT=1
old_IFS=$IFS
IFS=$’\n’
for LINE in `cat seating.txt`; do
THEATER[$COUNT]=$LINE
let COUNT=COUNT+1
done
IFS=$old_IFS
}
# Hint2
# Get current seating arrangement of
# selected movie from seating.txt
movie_data()
{
COUNT=1
LINE=${THEATER[$1]}
display_seats $LINE $2
}
# Mark occupied seat with a X and
# seats selected by user with a red X
mark_seat()
{
# Called by display_seats
if [ $(echo “$1” | grep -c “$2$3”) -gt 0 ]
then
echo -n “X”
set_colwidth “” 5
elif [ $(echo “$4” | grep -c “$2$3”) -gt 0 ]
then
echo -en ‘\E[1;31mX\E[0m’
set_colwidth “” 5
else
set_colwidth “” 6
fi
}
# Print out theater’s seating arrangement
display_seats()
{
COL=5
ROW=4
echo
echo “—————————————”
echo -e ‘\E[1;34;47m—————-SCREEN—————–\E[0m’
echo “—————————————”
for (( x=0; x<=$ROW; x++))
do
echo -n “$x” | tr “0” ” ”
for (( j=0; j<=$COL; j++))
do
if [ $x == “0” ]
then
echo -n $j | tr “012345” ” ABCDE”
set_colwidth “” 5
else
CURR_COL=$(echo $j | tr “12345” “ABCDE”)
if [ $j == “0” ]
then
set_colwidth “” 6
else
mark_seat $1 $CURR_COL $x $2
fi
fi
done
echo “”
done
echo “—————————————”
}
# Select and book seat manually
select_seat()
{
# Called by run_menu
COUNT=0
echo
echo “– Select A Seat Manually –”
echo
old_IFS=$IFS
IFS=$’\n’
print_movie_header “numbered”
for LINE in `sed -e ‘s/Yes/Ticket Available/g’ -e ‘s/No/SOLD OUT/g’ movielist.txt `;do
let COUNT=COUNT+1
echo -n “$COUNT. ”
print_movie $LINE
done
IFS=$old_IFS
echo
# Select movie to book
echo -en “Select Movie To Book (Enter 1 to ${COUNT}): ”
read NUM
NUMERIC=0
while [ “$NUMERIC” != “1” ];do
for (( x=$COUNT; x>=1; x–))
do
if [ $NUM == “$x” ];then
NUMERIC=1
fi
done
if [ “$NUMERIC” != “1” ];then
echo -en “Invalid Movie Selected, Try Again (Enter 1 to ${COUNT}): ”
read NUM
fi
done
movie_data $NUM
echo
all_valid=0
while [ $all_valid != “1” ]; do
echo -en “Enter the seat number(s) you want (eg: B3 or B1,C1,D1): ”
read selection
all_valid=1
for seat in `echo $selection | tr ‘,’ ‘\n’`; do
if [[ ! (“${#seat}” == “2” && “ABCDE” =~ “${seat:0:1}” && “12345” =~ “${seat:1:2}”) ]]; then
all_valid=0
fi
done
done
movie_data $NUM $selection
echo
num_tickets=$(echo $selection | tr ‘,’ ‘\n’ | wc -l)
price=$((num_tickets * 10))
echo -e “Total ticket(s) price for $num_tickets tickets is \$$price”
echo -e “To confirm your seats Marked in Red, press Y or N:”
read confirm
if [[ “$confirm” == “Y” || “$confirm” == “y” ]]; then
THEATER[$NUM]=${THEATER[$NUM]}”,”$selection
fi
old_IFS=$IFS
IFS=$’\n’
IFS=$old_IFS
echo
}
# Main menu navigation
run_menu()
{
i=-1
while [ “$i” != “q” ]; do
display_menu
read i
i=`echo $i | tr ‘[A-Z]’ ‘[a-z]’`
case “$i” in
“1”)
list_movies
;;
“2”)
select_seat
;;
“3”)
select_seat
;;
“4”)
filter_movies
;;
“q”)
echo “GoodBye, Have A Nice Day”
exit 0
;;
*)
echo “Unrecognised Input.”
;;
esac
done
}
#———————————————-#
# ———PROGRAM SCRIPT START HERE———- #
#———————————————-#
if [ ! -f movielist.txt ]; then
echo “Error: Movie list is not available”
fi
read_movie_data
run_menu
