239 lines
6.4 KiB
Bash
239 lines
6.4 KiB
Bash
#!/bin/bash
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IFS=''
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declare -i height=$(($(tput lines)-5)) width=$(($(tput cols)-2))
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declare -i head_r head_c tail_r tail_c
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declare -i alive
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declare -i length
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declare body
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declare -i direction delta_dir
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declare -i score=0
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border_color="\e[30;43m"
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snake_color="\e[32;42m"
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food_color="\e[34;44m"
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text_color="\e[31;43m"
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no_color="\e[0m"
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SIG_UP=USR1
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SIG_RIGHT=USR2
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SIG_DOWN=URG
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SIG_LEFT=IO
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SIG_QUIT=WINCH
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SIG_DEAD=HUP
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move_r=([0]=-1 [1]=0 [2]=1 [3]=0)
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move_c=([0]=0 [1]=1 [2]=0 [3]=-1)
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init_game() {
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clear
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echo -ne "\e[?25l"
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stty -echo
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for ((i=0; i<height; i++)); do
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for ((j=0; j<width; j++)); do
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eval "arr$i[$j]=' '"
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done
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done
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}
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move_and_draw() {
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echo -ne "\e[${1};${2}H$3"
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}
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draw_board() {
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move_and_draw 1 1 "$border_color+$no_color"
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for ((i=2; i<=width+1; i++)); do
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move_and_draw 1 $i "$border_color-$no_color"
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done
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move_and_draw 1 $((width + 2)) "$border_color+$no_color"
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echo
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for ((i=0; i<height; i++)); do
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move_and_draw $((i+2)) 1 "$border_color|$no_color"
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eval echo -en "\"\${arr$i[*]}\""
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echo -e "$border_color|$no_color"
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done
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move_and_draw $((height+2)) 1 "$border_color+$no_color"
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for ((i=2; i<=width+1; i++)); do
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move_and_draw $((height+2)) $i "$border_color-$no_color"
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done
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move_and_draw $((height+2)) $((width + 2)) "$border_color+$no_color"
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echo
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}
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init_snake() {
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alive=0
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length=10
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direction=0
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delta_dir=-1
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head_r=$((height / 4))
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head_c=$((width / 4))
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body=''
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for ((i = 0; i < length - 1; i++)); do
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body="1$body"
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done
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local p=$((${move_r[1]} * (length - 1)))
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local q=$((${move_c[1]} * (length - 1)))
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tail_r=$((head_r + p))
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tail_c=$((head_c + q))
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eval "arr$head_r[$head_c]=\"${snake_color}o$no_color\""
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prev_r=$head_r
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prev_c=$head_c
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b=$body
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while [ -n "$b" ]; do
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local p=${move_r[$(echo $b | grep -o '^[0-3]')]}
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local q=${move_c[$(echo $b | grep -o '^[0-3]')]}
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new_r=$((prev_r + p))
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new_c=$((prev_c + q))
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eval "arr$new_r[$new_c]=\"${snake_color}o$no_color\""
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prev_r=$new_r
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prev_c=$new_c
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b=${b#[0-3]}
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done
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}
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is_dead() {
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if [ "$1" -lt 0 ] || [ "$1" -ge "$height" ] || \
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[ "$2" -lt 0 ] || [ "$2" -ge "$width" ]; then
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return 0
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fi
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eval "local pos=\${arr$1[$2]}"
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if [ "$pos" == "${snake_color}o$no_color" ] || [[ "$pos" == *"$border_color"* ]]; then
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return 0
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fi
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return 1
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}
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init_wall() {
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local wall_start_r=$((height / 2 - 3))
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local wall_start_c=$((width / 2 - 30))
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local wall_text=(
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"████████╗██╗ ██████╗ ██████╗ ██████╗ ██████╗ ██╗ "
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"╚══██╔══╝██║ ██╔════╝ ██╔══██╗██╔═══██╗██╔═══██╗██║ "
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" ██║ ██║ ██║ ███╗ ██████╔╝██║ ██║██║ ██║██║ "
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" ██║ ██║ ██║ ██║ ██╔═══╝ ██║ ██║██║ ██║██║ "
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" ██║ ██║ ╚██████╔╝ ██║ ╚██████╔╝╚██████╔╝███████╗"
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" ╚═╝ ╚═╝ ╚═════╝ ╚═╝ ╚═════╝ ╚═════╝ ╚══════╝"
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)
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for ((i = 0; i < ${#wall_text[@]}; i++)); do
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for ((j = 0; j < ${#wall_text[i]}; j++)); do
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local r=$((wall_start_r + i))
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local c=$((wall_start_c + j))
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eval "arr$r[$c]=\"${border_color}${wall_text[i]:j:1}$no_color\""
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done
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done
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}
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give_food() {
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local food_r=$((RANDOM % height))
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local food_c=$((RANDOM % width))
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eval "local pos=\${arr$food_r[$food_c]}"
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while [ "$pos" != ' ' ]; do
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food_r=$((RANDOM % height))
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food_c=$((RANDOM % width))
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eval "pos=\${arr$food_r[$food_c]}"
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done
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eval "arr$food_r[$food_c]=\"$food_color@$no_color\""
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}
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move_snake() {
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local newhead_r=$((head_r + move_r[direction]))
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local newhead_c=$((head_c + move_c[direction]))
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eval "local pos=\${arr$newhead_r[$newhead_c]}"
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if $(is_dead $newhead_r $newhead_c); then
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alive=1
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return
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fi
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if [ "$pos" == "$food_color@$no_color" ]; then
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length+=1
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eval "arr$newhead_r[$newhead_c]=\"${snake_color}o$no_color\""
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body="$(((direction+2)%4))$body"
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head_r=$newhead_r
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head_c=$newhead_c
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score+=1
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give_food;
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return
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fi
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head_r=$newhead_r
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head_c=$newhead_c
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local d=$(echo $body | grep -o '[0-3]$')
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body="$(((direction+2)%4))${body%[0-3]}"
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eval "arr$tail_r[$tail_c]=' '"
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eval "arr$head_r[$head_c]=\"${snake_color}o$no_color\""
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local p=${move_r[(d+2)%4]}
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local q=${move_c[(d+2)%4]}
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tail_r=$((tail_r+p))
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tail_c=$((tail_c+q))
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}
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change_dir() {
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if [ $(((direction+2)%4)) -ne $1 ]; then
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direction=$1
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fi
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delta_dir=-1
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}
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getchar() {
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trap "" SIGINT SIGQUIT
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trap "return;" $SIG_DEAD
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while true; do
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read -s -n 1 key
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if [[ "$key" == $'\e' ]]; then
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read -s -n 2 arrow
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key+="$arrow"
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fi
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case "$key" in
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[qQ]) kill -$SIG_QUIT $game_pid
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return
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;;
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$'\e[A') kill -$SIG_UP $game_pid
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;;
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$'\e[C') kill -$SIG_RIGHT $game_pid
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;;
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$'\e[B') kill -$SIG_DOWN $game_pid
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;;
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$'\e[D') kill -$SIG_LEFT $game_pid
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;;
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esac
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done
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}
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game_loop() {
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trap "delta_dir=0;" $SIG_UP
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trap "delta_dir=1;" $SIG_RIGHT
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trap "delta_dir=2;" $SIG_DOWN
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trap "delta_dir=3;" $SIG_LEFT
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trap "exit 1;" $SIG_QUIT
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while [ "$alive" -eq 0 ]; do
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echo -e "\n${text_color}Your score: $score $no_color"
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if [ "$delta_dir" -ne -1 ]; then
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change_dir $delta_dir
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fi
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move_snake
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draw_board
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sleep 0.03
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done
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echo -e "${text_color}Oh no! You’re dead! Share your best score! :)$no_color"
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kill -$SIG_DEAD $$
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}
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clear_game() {
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stty echo
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echo -e "\e[?25h"
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}
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init_game
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init_snake
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init_wall
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give_food
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draw_board
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game_loop &
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game_pid=$!
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getchar
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clear_game
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exit 0
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