bash chess (partial)

chess.sh

#!/bin/bash

trap restore_cursor_exit INT
function restore_cursor_exit {
    printf '\e[?25h\n'
    exit 0
}
printf '\e[?25l'

color_clear=$'\e[0m'
color_rev=$'\e[7m'

color1=$'\e[33m'
color2=$'\e[34m'

posx='3'
posy='1'

declare -a space_chars=( ' ' "${color1}K" "${color1}Q" "${color1}R" "${color1}B" "${color1}N" "${color1}P" "${color2}K" "${color2}Q" "${color2}R" "${color2}B" "${color2}N" "${color2}P" )

declare -a row7=(  '9' '11' '10'  '8'  '7' '10' '11'  '9' )
declare -a row6=( '12' '12' '12' '12' '12' '12' '12' '12' )
declare -a row5=(  '0'  '0'  '0'  '0'  '0'  '0'  '0'  '0' )
declare -a row4=(  '0'  '0'  '0'  '0'  '0'  '0'  '0'  '0' )
declare -a row3=(  '0'  '0'  '0'  '0'  '0'  '0'  '0'  '0' )
declare -a row2=(  '0'  '0'  '0'  '0'  '0'  '0'  '0'  '0' )
declare -a row1=(  '6'  '6'  '6'  '6'  '6'  '6'  '6'  '6' )
declare -a row0=(  '3'  '5'  '4'  '2'  '1'  '4'  '5'  '3' )

key=''

function get_space_char {
    piece="space_chars["${1}"]"
    printf "${!piece}"
}

function print_board {
    printf '\e[1;1H+-----------------+  \e[E'
    for ((row = 7; row >= 0; row--)); do
        printf '|'
        for ((col = 0; col <= 7; col++)); do
            space="row"$row"["$col"]"
            printf ' '
            (( "$col" == "$posx" && "$row" == "$posy" )) && printf "${color_rev}"
            printf "$(get_space_char "${!space}")"${color_clear}""
        done
        printf ' |  \e[E'
    done
    printf '+-----------------+  '
}

function handle_inp {
    if [[ "$1" == $'\033[A' ]]; then
        key='k'
    elif [[ "$1" == $'\033[B' ]]; then
        key='j'
    elif [[ "$1" == $'\033[C' ]]; then
        key='l'
    elif [[ "$1" == $'\033[D' ]]; then
        key='h'
    else
        key="$1"
    fi

    case "$key" in
        h)
            if (( "$posx" == 0 )); then
                posx=7
            else
                (( posx-- )) >/dev/null 2>&1
            fi
            ;;
        j)
            if (( "$posy" == 0 )); then
                posy=7
            else
                (( posy-- )) >/dev/null 2>&1
            fi
            ;;
        k)
            if (( "$posy" == 7 )); then
                posy=0
            else
                (( posy++ )) >/dev/null 2>&1
            fi
            ;;
        l)
            if (( "$posx" == 7 )); then
                posx=0
            else
                (( posx++ )) >/dev/null 2>&1
            fi
            ;;
        q)
            restore_cursor_exit
    esac
}


printf '\e[1;1H\e[2J'

while :; do
    print_board
    read -sn1 inp >/dev/null 2>&1
    if [[ "$inp" == $'\033' ]]; then
        new_inp='_'
        while [[ "$new_inp" =~ [^A-Za-z] ]]; do
            read -sn1 new_inp >/dev/null 2>&1
            inp="${inp}${new_inp}"
        done
    fi
    handle_inp "$inp"
done