shell select code

select_menu.sh

#!/bin/sh

ESC=`printf "\033"`;

input_key() {
    read -s -n3 INPUT;
    echo $INPUT;
}

check_selected() {
    if [ $1 = $2 ];
    then echo " => "
    else echo "    "
    fi
}

select_menu() {
    SELECTED=1;
    INPUT="";
    MIN_MENU=1;
    MAX_MENU=$#;
    
    while true;
    do
        for (( i=1; i<=$#; i++))
        do
            printf "$ESC[2K$(check_selected $i $SELECTED) $i. ${!i}\n";
        done
        printf "\n$ESC[2KUse Arrow key to select and input Enter to select\n$ESC[2K(selected : ${!SELECTED})\n";
        INPUT=$(input_key);
        if [[ $INPUT = "" ]];
        then break;
        fi
        
        if [[ $INPUT = $ESC[A ]];
        then SELECTED=$(expr $SELECTED - 1);
        elif [[ $INPUT = $ESC[B ]];
        then SELECTED=$(expr $SELECTED + 1);
        fi
        
        if [[ $SELECTED -lt $MIN_MENU ]];
        then SELECTED=${MIN_MENU};
        elif [[ $SELECTED -gt $MAX_MENU ]];
        then SELECTED=${MAX_MENU};
        fi
        
        printf "$ESC[$(expr $# + 3)A";
    done
    return `expr ${SELECTED} - 1`;
}

select_test() {
    arr_params=("value1" "value2" "value3");
    echo "Select Value";
    select_menu "${arr_params[@]}";
    local SELECTED=$?;
    SELECTED_MODE=${arr_params[${SELECTED}]};
}

main() {
    select_test;
}

main