lukskeychainfunctions

#!/bin/sh

script_version_functions="06032024-0247"

PREREQ=""

# Output prerequisites
prereqs() {
    echo "$PREREQ"
}

case "$1" in
    prereqs)
        prereqs
        exit 0
        ;;
esac


clear_the_line() {
    echo -ne "\033[2K" ; echo -ne "\r"
}

clear_the_line_go_up_and_clean_the_line() {
   echo -ne "\033[2K" # erase line
   echo -ne "\033[A\033[K" # up and erase to end of line (and go to new line)
   echo -ne "\033[2K" # erase line
   echo -ne "\r"
}


clear_input_buffer() {

    echo -n "  Clearing the input buffer (1 second)..."
    read -t 1 -n 111
    clear_the_line

   # Non-working examples in my version of BusyBox:
   
   #while read -t 0; do : ; done
   #read -d '' -t 0 -n 1
   #read -t 0 -n 1
   
}


# Function to clear the character
clear_character() {
    printf '\b \b'  # Move the cursor back, print a space, move the cursor back again
}


debug_pause() {

    if [ -n "${1}" ]; then
        timeout=$1
    else
        timeout=5
    fi

    while :; do

        echo "[ DEBUG: debug_pause ${timeout} / script version: ${script_version}/${script_version_functions} ]"

        clear_input_buffer
        clear_the_line_go_up_and_clean_the_line
        echo "Press 's' to drop to shell, or wait $timeout seconds to continue automatically, or press the spacebar to continue now..."

        choice="" # Setting the default value of choice to '' because the BusyBox read command
                  # doesn't change its value when no user input is provided.

        # Read a single character with timeout
        read -t $timeout -n 1 -r choice
        clear_the_line_go_up_and_clean_the_line
        # clear_character
        
        if [ "${choice}" = "s" ] || [ "${choice}" = "d" ]; then
            if [ -r /usr/bin/mcedit ];  then 
                echo "Dropping to shell... (Type 'exit' and press Enter to exit. Programs 'mc' and 'mcedit' are available.)"
            else
                echo "Dropping to shell... (Type 'exit' and press Enter to exit.)"
            fi
            /bin/sh
            break
        elif [ -n "${choice}" ]; then
            continue
        else
            break
        fi

    done

    echo "Continuing..."
    clear_input_buffer
    clear_the_line_go_up_and_clean_the_line
}


dialog_skip_or_do() {

    if [ -n "${1}" ]; then
        timeout_dialog_skip_or_do=$1 # local variable
    else
        echo "ERROR: timeout not specified."
        exit 2
    fi

    if [ -n "${2}" ]; then # if string is not null
       echo "${2}"
    fi

    while :; do

        clear_input_buffer
        clear_the_line
        
        echo "Press 'c' to cancel, or press 's' to drop to shell,"
        echo "or wait $timeout_dialog_skip_or_do seconds to continue automatically, or press the spacebar to continue now..."

        choice="" # Setting the default value of choice to '' because the BusyBox read command
                  # doesn't change its value when no user input is provided.

        # Read a single character with timeout
        read -t $timeout_dialog_skip_or_do -n 1 -r key
        clear_the_line_go_up_and_clean_the_line
        # clear_character
        
        if [ "${choice}" = "s" ] || [ "${choice}" = "d" ]; then
            if [ -r /usr/bin/mcedit ];  then 
                echo "Dropping to shell... (Type 'exit' and press Enter to exit. Programs 'mc' and 'mcedit' are available.)"
            else
                echo "Dropping to shell... (Type 'exit' and press Enter to exit.)"
            fi
            /bin/sh
            break
        elif [ "${choice}" = "c" ]; then
            echo "Cancelling..."
            clear_input_buffer
            clear_the_line_go_up_and_clean_the_line
            clear_the_line_go_up_and_clean_the_line
            echo "... Canceled."
            return 1
        elif [ -n "${choice}" ]; then
            continue
        else
            break
        fi

    done

    echo "Continuing..."
    clear_input_buffer
    clear_the_line_go_up_and_clean_the_line
    if [ -n "${2}" ]; then # if string is not null
        clear_the_line_go_up_and_clean_the_line
    fi
    return 0
}