PROGRAM DESCRIPTION: Pre-Tasks: Create a directory named Minor2\" Clone the game

Question

PROGRAM DESCRIPTION: Pre-Tasks: Create a directory named Minor2" Clone the game Github repository into your Minor2" directory o git clone https://github.com/pihades/bash-snake.git Create a minor2.sh bash script within your "Minor2" directory Scenario: You are given a simple snake game written in Bash. Your first taskis to read the instructions on how to play it via any Unix/Linux shell. Before, you start to play the game, you must: Record your terminal session using script command utility and save the session into a file named "minor2 session", without the quotes. Start the game, and play it until the game session ends. To stop recording your terminal session, send "CTRLAD" signal. To-do: 1. write a bash script named "minor2.sh" to analyze your "minor2 session saved a terminal session. 2. In your bash script comments' section, add the summary (about one paragraph or so) about how the snake game works based on your understanding of the game source code. BONUS: In your bash script comments' section, provide a clear and concise plan features-wise on how can you extend or improve this game OR provide this game critique analysis summaryz. (+10 pts) More specifically: Your bash script should accept the recorded terminal session file as a command line argument. Then, your script should display a menu, and respective prompts to view the contents of the "minor2 session file. Your bash script should employ mechanism to continue providing the menu to the user and acting on the user's choices, until the user decides to end the dialogue. Hint: grep, head, tail (Recommended Unix/Linux utilities). Please see the SAMPLE OUTPUT as this assignment's minimal required set of outputs.

Explanation / Answer

#!/bin/bash

IFS=''

declare -i height=$(($(tput lines)-5)) width=$(($(tput cols)-2))

# row and column number of head
declare -i head_r head_c tail_r tail_c

declare -i alive
declare -i length
declare body

declare -i direction delta_dir
declare -i score=0

border_color="E[30;43m"
snake_color="E[32;42m"
food_color="E[34;44m"
text_color="E[31;43m"
no_color="E[0m"

# signals
SIG_UP=35
SIG_RIGHT=36
SIG_DOWN=37
SIG_LEFT=38
SIG_QUIT=39
SIG_DEAD=40

# direction arrays: 0=up, 1=right, 2=down, 3=left
move_r=([0]=-1 [1]=0 [2]=1 [3]=0)
move_c=([0]=0 [1]=1 [2]=0 [3]=-1)

init_game() {
clear
echo -ne "[?25l"
stty -echo
for ((i=0; i<height; i++)); do
for ((j=0; j<width; j++)); do
eval "arr$i[$j]=' '"
done
done
}

move_and_draw() {
echo -ne "E[${1};${2}H$3"
}

# print everything in the buffer
draw_board() {
move_and_draw 1 1 "$border_color+$no_color"
for ((i=2; i<=width+1; i++)); do
move_and_draw 1 $i "$border_color-$no_color"
done
move_and_draw 1 $((width + 2)) "$border_color+$no_color"
echo

for ((i=0; i<height; i++)); do
move_and_draw $((i+2)) 1 "$border_color|$no_color"
eval echo -en ""${arr$i[*]}""
echo -e "$border_color|$no_color"
done

move_and_draw $((height+2)) 1 "$border_color+$no_color"
for ((i=2; i<=width+1; i++)); do
move_and_draw $((height+2)) $i "$border_color-$no_color"
done
move_and_draw $((height+2)) $((width + 2)) "$border_color+$no_color"
echo
}

# set the snake's initial state
init_snake() {
alive=0
length=10
direction=0
delta_dir=-1

head_r=$((height/2-2))
head_c=$((width/2))

body=''
for ((i=0; i<length-1; i++)); do
body="1$body"
done

local p=$((${move_r[1]} * (length-1)))
local q=$((${move_c[1]} * (length-1)))

tail_r=$((head_r+p))
tail_c=$((head_c+q))

eval "arr$head_r[$head_c]="${snake_color}o$no_color""

prev_r=$head_r
prev_c=$head_c

b=$body
while [ -n "$b" ]; do
# change in each direction
local p=${move_r[$(echo $b | grep -o '^[0-3]')]}
local q=${move_c[$(echo $b | grep -o '^[0-3]')]}
new_r=$((prev_r+p))
new_c=$((prev_c+q))
eval "arr$new_r[$new_c]="${snake_color}o$no_color""
prev_r=$new_r
prev_c=$new_c
b=${b#[0-3]}
done
}
is_dead() {
if [ "$1" -lt 0 ] || [ "$1" -ge "$height" ] ||
[ "$2" -lt 0 ] || [ "$2" -ge "$width" ]; then
return 0
fi
eval "local pos=${arr$1[$2]}"
if [ "$pos" == "${snake_color}o$no_color" ]; then
return 0
fi
return 1
}
give_food() {
local food_r=$((RANDOM % height))
local food_c=$((RANDOM % width))
eval "local pos=${arr$food_r[$food_c]}"
while [ "$pos" != ' ' ]; do
food_r=$((RANDOM % height))
food_c=$((RANDOM % width))
eval "pos=${arr$food_r[$food_c]}"
done
eval "arr$food_r[$food_c]="$food_color@$no_color""
}
move_snake() {
local newhead_r=$((head_r + move_r[direction]))
local newhead_c=$((head_c + move_c[direction]))
eval "local pos=${arr$newhead_r[$newhead_c]}"
if $(is_dead $newhead_r $newhead_c); then
alive=1
return
fi
if [ "$pos" == "$food_color@$no_color" ]; then
length+=1
eval "arr$newhead_r[$newhead_c]="${snake_color}o$no_color""
body="$(((direction+2)%4))$body"
head_r=$newhead_r
head_c=$newhead_c
score+=1
give_food;
return
fi
head_r=$newhead_r
head_c=$newhead_c
local d=$(echo $body | grep -o '[0-3]$')
body="$(((direction+2)%4))${body%[0-3]}"
eval "arr$tail_r[$tail_c]=' '"
eval "arr$head_r[$head_c]="${snake_color}o$no_color""
# new tail
local p=${move_r[(d+2)%4]}
local q=${move_c[(d+2)%4]}
tail_r=$((tail_r+p))
tail_c=$((tail_c+q))
}
change_dir() {
if [ $(((direction+2)%4)) -ne $1 ]; then
direction=$1
fi
delta_dir=-1
}
getchar() {
trap "" SIGINT SIGQUIT
trap "return;" $SIG_DEAD
while true; do
read -s -n 1 key
case "$key" in
[qQ]) kill -$SIG_QUIT $game_pid
return
;;
[kK]) kill -$SIG_UP $game_pid
;;
[lL]) kill -$SIG_RIGHT $game_pid
;;
[jJ]) kill -$SIG_DOWN $game_pid
;;
[hH]) kill -$SIG_LEFT $game_pid
;;
esac
done
}
game_loop() {
trap "delta_dir=0;" $SIG_UP
trap "delta_dir=1;" $SIG_RIGHT
trap "delta_dir=2;" $SIG_DOWN
trap "delta_dir=3;" $SIG_LEFT
trap "exit 1;" $SIG_QUIT
while [ "$alive" -eq 0 ]; do
echo -e " ${text_color} Your score: $score $no_color"
if [ "$delta_dir" -ne -1 ]; then
change_dir $delta_dir
fi
move_snake
draw_board
sleep 0.03
done
  
echo -e "${text_color}Oh, No! You 0xdead$no_color"
# signals the input loop that the snake is dead
kill -$SIG_DEAD $$
}
clear_game() {
stty echo
echo -e "[?25h"
}
init_game
init_snake
give_food
draw_board
game_loop &
game_pid=$!
getchar
clear_game
exit 0

in this snake game it has two process .one is used for the user control which is the foreground and the another one is for the background process.
PID grasp the background process
several traps can be made but the execution shoud not be disturbed.
in the program the body of the snake is represented by $head_r and $head_c for the row and column.
A 2d array has been used for the eval command.
for every iteration the board has been redrawn.

additionally we can provide the bonus point.The bonus point in the game can be provided with a time where by the snake has to eat the food with in the time.

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