#!/bin/bash
# shellcheck source=kzcommon.sh
# ##############################################################################
# Apps installeren.
#
# Geschreven door Karel Zimmer <info@karelzimmer.nl>.
#
# Auteursrecht © 2009-2020 Karel Zimmer.
# GNU Algemene Publieke Licentie v3 <https://www.gnu.org/licenses/gpl.html>.
# ##############################################################################
# REL_NUM=55.05.00
# REL_DAT=2020-10-14
# REL_MSG='Controle en toelichting installatiebestanden aangepast'

# ##############################################################################
# Settings
# ##############################################################################
source "$(dirname "$0")"/kzcommon.sh

# ------------------------------------------------------------------------------
# Global constants
# ------------------------------------------------------------------------------
readonly BEGIN_INFO="\
==============================================================================
= Volg onderstaande aanvullende instructies na het installeren van deze apps =
=============================================================================="
readonly END_INFO="
==============================================================================
= Volg bovenstaande aanvullende instructies na het installeren van deze apps =
=============================================================================="
readonly BEGIN_REMOVE_INFO="\
====================================================================
= Volg onderstaande instructies voor het verwijderen van deze apps =
===================================================================="
readonly END_REMOVE_INFO="
====================================================================
= Volg bovenstaande instructies voor het verwijderen van deze apps =
===================================================================="
readonly EDITION_DEFAULT=desktop
readonly RUN_AS_SUPERUSER=true

# Bij aanpassingen ook .completion aanpassen!
readonly OPTIONS_SHORT=$OPTIONS_SHORT_COMMON'ace:firs'
readonly OPTIONS_LONG=$OPTIONS_LONG_COMMON",apps,cat,edition:,files,info,\
remove-info,simulate"
readonly USAGE="Gebruik: $PROGNAME [-a|--apps] [-c|--cat] \
[-e|--edition=EDITIE] [-f|--files]
                   [-i|--info] [-r|--remove-info] [-s|--simulate]
                   $OPTIONS_USAGE_COMMON
                   [APP...] [BESTAND...]

$OPTIONS_LONG_SHORT

$ARGUMENT_LONG_SHORT"
readonly HELP="Gebruik: $PROGNAME [OPTIE...] [--] [APP...] [BESTAND...]

Apps installeren.

Opties:
  $OPTIONS_LONG_SHORT

  $ARGUMENT_LONG_SHORT

  -a --apps           Toon lijst van te installeren apps
  -c --cat            Toon inhoud van installatiebestanden
  -e --edition=EDITIE Gebruik opgegeven editie
  -f --files          Toon lijst van alle installatiebestanden
  -i --info           Toon aanvullende instructies na het installeren van de \
apps
  -r --remove-info    Toon instructies voor het verwijderen van de apps
  -s --simulate       Geen actie, simuleer installatie, en toon opdracht die
                      uitgevoerd zou worden
$OPTIONS_HELP_COMMON

Argumenten:
  APP                 Opgegeven apps verwerken
  BESTAND             Opgegeven bestanden verwerken"

# ------------------------------------------------------------------------------
# Global variables
# ------------------------------------------------------------------------------
declare -a APP_ARGUMENT=''
declare -a FILE_ARGUMENT=''
declare -a INPUTFILE=''
declare ARGUMENT_APP=false
declare ARGUMENT_FILE=false
declare COMMANDS_FOUND=false
declare DFLTFILE_1=''
declare DFLTFILE_2=''
declare DFLTFILE_NOTFOUND=''
declare DISTRO=''
declare EDITION_ARGUMENT=''
declare EDITION=$EDITION_DEFAULT
declare EXECUTE_COMMANDS=true
declare -i MAXRC=0
declare INFO_FOUND=false
declare OPTION_APPS=false
declare OPTION_CAT=false
declare OPTION_EDITION=false
declare OPTION_FILES=false
declare OPTION_INFO=false
declare OPTION_REMOVE_INFO=false
declare OPTION_SIMULATE=false
declare REMOVE_INFO_FOUND=false
declare TEMP_TEXT_FILE=''

# ##############################################################################
# Functions
# ##############################################################################
check_input() {
    local file_notfound=false
    local -i app_arg_num=0
    local -i file_arg_num=0
    local -i file_num=0
    local -i getopt_rc=0
    local parsed=''

    set +o errexit
    parsed=$(
        getopt  --alternative                       \
                --options       "$OPTIONS_SHORT"    \
                --longoptions   "$OPTIONS_LONG"     \
                --name          "$PROGNAME"         \
                -- "$@"
        )
    getopt_rc=$?
    set -o errexit
    if [[ $getopt_rc -ne 0 ]]; then
        printf '%s\n' "$USAGELINE" >&2
        QUIET=true exit $ERROR
    fi
    eval set -- "$parsed"
    process_general_options "$@"

    while true; do
        case $1 in
            -a|--apps)
                OPTION_APPS=true
                shift
                ;;
            -c|--cat)
                OPTION_CAT=true
                shift
                ;;
            -e|--edition)
                if $OPTION_EDITION; then
                    printf  "$PROGNAME: %s\n%s\n"   \
                            "optie '$1' éénmaal opgeven" "$USAGELINE" >&2
                    QUIET=true exit $ERROR
                else
                    OPTION_EDITION=true
                    EDITION_ARGUMENT=$2
                    EDITION=$EDITION_ARGUMENT
                fi
                shift 2
                ;;
            -f|--files)
                OPTION_FILES=true
                shift
                ;;
            -i|--info)
                OPTION_INFO=true
                EXECUTE_COMMANDS=false
                shift
                ;;
            -r|--remove-info)
                OPTION_REMOVE_INFO=true
                EXECUTE_COMMANDS=false
                shift
                ;;
            -s|--simulate)
                OPTION_SIMULATE=true
                EXECUTE_COMMANDS=false
                shift
                ;;
            --)
                shift
                break
                ;;
            *)
                shift
                ;;
        esac
    done

    DISTRO=$ID-$VERSION_ID-$EDITION
    DFLTFILE_1=$PROGDIR/$PROGNAME-$DISTRO.sh
    DFLTFILE_2=$PROGDIR/$PROGNAME-$DISTRO-$HOSTNAME.sh
    DFLTFILE_NOTFOUND="Geen bestanden zoals $PROGNAME-$DISTRO*.sh in $PROGDIR."

    # Verwerk argumenten.
    while [[ "$*" ]]; do
        if [[ "$(basename "$1")" == $PROGNAME-*.sh ]]; then
            ARGUMENT_FILE=true
            FILE_ARGUMENT[$file_arg_num]=$1
            (( ++file_arg_num ))
            shift
        else
            ARGUMENT_APP=true
            APP_ARGUMENT[$app_arg_num]=$1
            (( ++app_arg_num ))
            shift
        fi
    done
    if $ARGUMENT_APP; then
        process_argument_app
    fi
    if $ARGUMENT_FILE; then
        process_argument_file
    fi
    # Als APP of FILE is opgegeven, de DFLTFILEs niet verwerken.
    if ! ($ARGUMENT_APP || $ARGUMENT_FILE); then
        process_dfltfiles
    fi
    if $file_notfound; then
        QUIET=true exit $SUCCESS
    fi

    # Verwerk opties (optie cat is afhankelijk van argumenten APP en FILE).
    if $OPTION_APPS; then
        process_option_apps
        QUIET=true exit $SUCCESS
    elif $OPTION_FILES; then
        process_option_files
        QUIET=true exit $SUCCESS
    elif $OPTION_CAT; then
        process_option_cat
        QUIET=true exit $SUCCESS
    fi

    # We gaan opdrachten uitvoeren, mogen we dat wel?
    if $EXECUTE_COMMANDS; then
        check_user
    fi
}

process_option_apps() {
    local temp_text_file

    temp_text_file=$(mktemp -t "$PROGNAME-XXXXXXXXXX.txt")

    # shellcheck disable=SC2062
    printf '%s\n' "De volgende apps kunnen geïnstalleerd worden:
NUMMER APP
$(
    if !    grep    --regexp='^#@'                      \
                    --no-messages                       \
                    "$PROGDIR/$PROGNAME-$DISTRO"*.sh    |
            awk     -F#@                                \
                    '{print $2}'                        |
            sort    --unique                            |
            nl      --number-width=6                    \
                    --number-format=rn                  \
                    --number-separator=' '              \
                    --body-numbering=a; then
        printf  '%s\n' "     0 Geen apps gevonden.

$DFLTFILE_NOTFOUND"
    else
        printf  '%s\n' "
De gevonden apps zijn te gebruiken als invoer voor dit script:
    ${BLUE}$PROGNAME APP...${NORMAL}
Voor meer informatie voer uit:
    ${BLUE}$PROGNAME --sim APP...${NORMAL}
    ${BLUE}$PROGNAME --cat APP...${NORMAL}"
    fi
)"  > "$temp_text_file"

    if $OPTION_GUI; then
        remove_non_printables "$temp_text_file"
        # Constructie '2> >($LOGCMD)' om stderr naar de log te krijgen.
        # Voorbeeld: Unable to init server: Kon niet verbinden:
        #            Verbinding is geweigerd
        #        en: (zenity:47712): Gtk-WARNING **: 10:35:49.339:
        #            cannot open display:
        if ! zenity --text-info                         \
                    --width         550                 \
                    --height        600                 \
                    --title         'Overzicht apps'    \
                    --filename      "$temp_text_file"   \
                    --font          'Ubuntu Mono 12'    \
                    --ok-label      'Oké'               \
                    --cancel-label  'Annuleren'         \
                    2> >($LOGCMD); then
            true
        fi
    else
        cat "$temp_text_file"
    fi

    rm "$temp_text_file"
}

process_option_files() {
    local temp_text_file

    temp_text_file=$(mktemp -t "$PROGNAME-XXXXXXXXXX.txt")

    # shellcheck disable=SC2012
    printf '%s\n' "De volgende installatiebestanden zijn beschikbaar:
NUMMER BESTAND
$(
    if !    ls  --format=single-column                      \
                "$PROGDIR/$PROGNAME-$DISTRO"*.sh            \
                2> /dev/null                                |
            nl  --number-width=6                            \
                --number-format=rn                          \
                --number-separator=' '                      \
                --body-numbering=a; then
        printf  '%s\n' "     0 Geen bestanden gevonden.

$DFLTFILE_NOTFOUND"
    else
        printf '%s\n' "
De gevonden bestanden zijn te gebruiken als invoer voor dit script:
    ${BLUE}$PROGNAME BESTAND...${NORMAL}
Voor meer informatie voer uit:
    ${BLUE}$PROGNAME --sim BESTAND...${NORMAL}
    ${BLUE}$PROGNAME --cat BESTAND...${NORMAL}"
    fi
)"  > "$temp_text_file"

    if $OPTION_GUI; then
        remove_non_printables "$temp_text_file"
        if ! zenity --text-info                             \
                    --width         750                     \
                    --height        600                     \
                    --title         'Overzicht bestanden'   \
                    --filename      "$temp_text_file"       \
                    --font          'Ubuntu Mono 12'        \
                    --ok-label      'Oké'                   \
                    --cancel-label  'Annuleren'             \
                    2> >($LOGCMD); then
            true
        fi
    else
        cat "$temp_text_file"
    fi

    rm "$temp_text_file"
}

process_argument_app() {
    local app=''
    local app_found=false
    local file=''

    for app in "${APP_ARGUMENT[@]}"; do
        # Zoek exact (line-regexp) naar app-tag in installatiebestanden.
        # Alleen eerstgevonden bestand verwerken (lines=1), want tag kan
        # in meerdere bestanden voorkomen.
        # shellcheck disable=SC2062
        file=$(
            if ! grep   --files-with-matches                \
                        --line-regexp                       \
                        --regexp="#@$app"                   \
                        "$PROGDIR/$PROGNAME-$DISTRO"*.sh    \
                        2> /dev/null                        |
                head    --lines=1; then
                printf  '%s' ''
            fi
            )
        if [[ $file ]]; then
            process_argument_app_file
        else
            info "App '$app' niet gevonden."
            file_notfound=true
        fi
    done
    if $file_notfound; then
        info "Typ 'kzsetup --apps' voor meer informatie."
    fi
}

process_argument_app_file() {
    local description_found=false
    local record=''
    local temp_sh=''

    temp_sh=$(mktemp -t "$PROGNAME-$app-XXXXXXXXXX.sh")
    while read -r record; do
        case $record in
            '#@'*)
                if [[ $record = '#@'$app ]]; then
                    if $app_found; then
                        info "Dubbele app-tag $app."
                    else
                        # Gezochte app-tag.
                        printf  '%b\n'                              \
                                "# $DASHES\n# Bestand: $temp_sh"    \
                                >> "$temp_sh"
                        # Regels doorschrijven naar tijdelijk
                        # bestand tot eerstvolgende app-tag of
                        # beschrijving (verplicht), of tot EOF.
                        app_found=true
                    fi
                elif $app_found; then
                    # Volgende app-tag.
                    break
                fi
                ;;
            '#1'*)
                # Beschrijving.
                if $description_found; then
                    # Volgende beschrijving.
                    break
                elif $app_found; then
                    printf '%b\n' \
                        "#    Bron: $file\n# $DASHES\n\n$record"    \
                        >> "$temp_sh"
                    description_found=true
                fi
                ;;
            *)
                # Overige regels.
                if $app_found; then
                    printf '%s\n' "$record" >> "$temp_sh"
                fi
                ;;
        esac
    done < "$file"
    if ! grep   --quiet                                             \
                --line-regexp                                       \
                --regexp='# EOF' "$temp_sh"
    then
        printf '%s\n' '# EOF' >> "$temp_sh"
    fi
    INPUTFILE[$file_num]=$temp_sh
    (( ++file_num ))
}

process_argument_file() {
    local file=''

    for file in "${FILE_ARGUMENT[@]}"; do
        if [[ -e $file ]]; then
            INPUTFILE[$file_num]=$file
            (( ++file_num ))
        else
            info "Bestand '$file' bestaat niet."
            file_notfound=true
        fi
    done
    if $file_notfound; then
        info "Typ 'kzsetup --files' voor meer informatie."
    fi
}

process_dfltfiles() {
    if [[ -e $DFLTFILE_1 ]]; then
        INPUTFILE[$file_num]=$DFLTFILE_1
        (( ++file_num ))
    else
        file_notfound=true
    fi
    # Niet verplicht aanwezig.
    if [[ -e $DFLTFILE_2 ]]; then
        INPUTFILE[$file_num]=$DFLTFILE_2
        (( ++file_num ))
    fi
    if $file_notfound; then
        info "$DFLTFILE_NOTFOUND"
    fi
}

process_option_cat() {
    local temp_text_file

    temp_text_file=$(mktemp -t "$PROGNAME-XXXXXXXXXX.txt")

    for file in "${INPUTFILE[@]}"; do
        {
            printf  '%s\n' "${BLUE}# $file${NORMAL}"
            cat     "$file"
        }   >> "$temp_text_file"
    done

    if $OPTION_GUI; then
        remove_non_printables "$temp_text_file"
        if ! zenity --text-info                         \
                    --width         1100                \
                    --height        600                 \
                    --title         'Inhoud bestanden'  \
                    --filename      "$temp_text_file"   \
                    --font          'Ubuntu Mono 12'    \
                    --ok-label      'Oké'               \
                    --cancel-label  'Annuleren'         \
                    2> >($LOGCMD); then
            true
        fi
    else
        less "$LESS_OPTIONS" "$temp_text_file"
    fi

    rm "$temp_text_file"
}

process_input() {
    local file=''
    local -i app_seq_num=0
    local -i app_tot_num=0
    local text=''

    TEMP_TEXT_FILE=$(mktemp -t "$PROGNAME-XXXXXXXXXX.txt")

    for file in "${INPUTFILE[@]}"; do
        if $OPTION_SIMULATE || $EXECUTE_COMMANDS; then
            app_seq_num=0
            # 'if ! grep --regexp='^#1' ...; then ...' werkt niet;
            # grep geeft 0 terug als niets gevonden, OK, maar dan ook rc=1, ¬OK.
            app_tot_num=$(
                grep    --word-regexp   \
                        --regexp='^#1'  \
                        --count "$file" ||
                true
                )
        fi

        if $EXECUTE_COMMANDS && $OPTION_GUI; then
            title='Apps installeren'
            text="Verwerk bestand $file"
            # Met "|& zenity --progress" worden globale variabelen uit
            # aangeroepen functies niet doorgegeven, vandaar de
            # 'process substitution' met "> >(zenity ...)".
            # Zenity progress-informatie per opdracht (bij setup per bestand).
            process_file "$file" > >(
                zenity  --progress              \
                        --pulsate               \
                        --auto-close            \
                        --no-cancel             \
                        --width     700         \
                        --height    50          \
                        --title     "$title"    \
                        --text      "$text"     \
                        2> >($LOGCMD)
                )
        else
            process_file "$file"
        fi
    done
}

process_file() {
    local file=${1:-file?}
    local description='### GEEN BESCHRIJVING ###'
    local file_text=''
    local -i cmd_seq_num=0
    local prev_recordtype=''
    local record=''
    local recordtype=''
    local write_description_line=true

    file_text="${BOLD}[BEGIN] Bestand $file${NORMAL}"
    if $EXECUTE_COMMANDS; then
        log "$file_text"
        printf '%b'   "${CURSOR_INVISABLE}"
        printf '%s\n' "$file_text"
    elif $OPTION_SIMULATE; then
        printf '%s\n' "$file_text" >> "$TEMP_TEXT_FILE"
    fi

    while read -r record; do
        recordtype=${record:0:2}
        case $recordtype in
            '#1')
                process_description "$record"
                ;;
            '#2')
                process_install_instruction "$record"
                ;;
            '#3')
                process_remove_instruction "$record"
                ;;
            ''|'#'*)
                continue
                ;;
            *)
                process_command "$record"
                ;;
        esac
        prev_recordtype=$recordtype
    done < "$file"

    file_text="${BOLD}[EINDE] Bestand $file${NORMAL}"
    if $EXECUTE_COMMANDS; then
        log "$file_text"
        printf '%s\n' "$file_text"
        printf '%b'   "${CURSOR_VISABLE}"
    elif $OPTION_SIMULATE; then
        printf '%s\n' "$file_text" >> "$TEMP_TEXT_FILE"
    fi
}

process_description() {
    local record=${1:-record?}

    description="${record:3}"
    if ! $OPTION_SIMULATE && ! $EXECUTE_COMMANDS; then
        return 0
    fi

    write_description_line=true
    (( ++app_seq_num ))
    cmd_seq_num=0
}

process_install_instruction() {
    local record=${1:-record?}

    INFO_FOUND=true
    if ! $OPTION_INFO; then
        return 0
    fi
    if [[ $app_seq_num -eq 0 ]]; then
        printf '%s\n' "$BEGIN_INFO" > "$TEMP_TEXT_FILE"
    fi
    if [[ $prev_recordtype = '#2' ]]; then
        printf '%s\n' "    ${record:3}" >> "$TEMP_TEXT_FILE"
    else
        (( ++app_seq_num ))
        printf "\n%2s. %s\n    %.${#description}s\n    %s\n" \
"$app_seq_num" "$description" "$DASHES" "${record:3}" >> "$TEMP_TEXT_FILE"
    fi
}

process_remove_instruction() {
    local record=${1:-record?}

    REMOVE_INFO_FOUND=true
    if ! $OPTION_REMOVE_INFO; then
        return 0
    fi
    if [[ $app_seq_num -eq 0 ]]; then
        printf '%s\n' "$BEGIN_REMOVE_INFO" > "$TEMP_TEXT_FILE"
    fi
    if [[ $prev_recordtype = '#3' ]]; then
        printf '%s\n' "    ${record:3}" >> "$TEMP_TEXT_FILE"
    else
        (( ++app_seq_num ))
        printf  "\n%2s. %s\n    %.${#description}s\n    %s\n"           \
                "$app_seq_num" "$description" "$DASHES" "${record:3}"   \
                >> "$TEMP_TEXT_FILE"
    fi
}

process_command() {
    local cmd=${1:-cmd?}
    local -i cmd_rc=0
    local description_line=''
    local -i description_maxlen=1000
    local description_printf=''
    local status=''

    COMMANDS_FOUND=true
    (( ++cmd_seq_num ))

    if $OPTION_SIMULATE; then
        if $write_description_line; then
            printf '[%2d/%-2d] %s\n' \
"$app_seq_num" "$app_tot_num" "$description" >> "$TEMP_TEXT_FILE"
        fi
        write_description_line=false
        printf  '%7s [%2d] %s\n'                                \
                " " "$cmd_seq_num" "${BLUE}$record${NORMAL}"    \
                >> "$TEMP_TEXT_FILE"
    elif $EXECUTE_COMMANDS; then
        description_printf=$description
        if $OPTION_GUI; then
            printf  '%s\n' \
                    "#Bestand:\t$file\n\nVerwerk:\t[$app_seq_num/$app_tot_num] \
$description\n\n\Opdracht:\t$record"
        else
            # Afbreken in Terminalvenster moet i.v.m. updaten status van BEZIG
            # naar GOED of FOUT.
            #  <------------ tput cols ------------->
            # '[BEZIG] [ 1/1 ] [ 1] Te lange descr...' <== moet 1 regel blijven
            #  <------- 21 -------->
            description_maxlen=$(($(tput cols) - 21))
            if [[ ${#description_printf} -gt $description_maxlen ]]; then
                description_printf=\
${description_printf:0:(($description_maxlen - 3))}'...'
            fi
        fi
        printf  -v  description_line                                \
                    "[%2d/%-2d] [%2d] %-${description_maxlen}.\
${description_maxlen}s"                                             \
                    "$app_seq_num" "$app_tot_num" "$cmd_seq_num"    \
"$description_printf"
        execute_command "$record"
    fi
}

execute_command() {
    local cmd=${1:-cmd?}
    local -i cmd_rc=0
    local status=''

    check_dpkg_available
    if ! $OPTION_GUI; then
        if [[ $cmd_seq_num -eq 1 ]]; then
            printf " $STATUS_BUSY %s\r" "$description_line"
        else
            printf " $STATUS_BUSY         %s\r" "${description_line:8}"
        fi
    fi

    set +o errexit
    set +o nounset
    log "$description_line"
    log "${BLUE}$cmd${NORMAL}"
    eval "$cmd" |& $LOGCMD
    cmd_rc=$?
    set -o errexit
    set -o nounset

    if [[ $cmd_rc -gt $MAXRC ]]; then
        MAXRC=$cmd_rc
    fi
    if [[ $cmd_rc -eq 0 ]]; then
        status="$STATUS_SUCCESS"
    else
        status="$STATUS_ERROR"
    fi
    printf ' %s\n' "$status"
    log "$status rc=$cmd_rc, maxrc=$MAXRC"
}

check_dpkg_available() {
    local -i wait_for_aptd=10
    local text='Wacht totdat andere softwarebeheerders klaar zijn ...'

    if ls /snap/core/*/var/cache/debconf/config.dat &> /dev/null; then
        # shellcheck disable=SC2024
        while sudo  fuser                                               \
                    /var/{lib/{dpkg,apt/lists},cache/apt/archives}/lock \
                    /var/cache/debconf/config.dat                       \
                    /snap/core/*/var/cache/debconf/config.dat           \
                    &> /dev/null; do
            info    "$text"
            sleep   $wait_for_aptd
        done
    else
        # shellcheck disable=SC2024
        while sudo  fuser                                               \
                    /var/{lib/{dpkg,apt/lists},cache/apt/archives}/lock \
                    /var/cache/debconf/config.dat                       \
                    &> /dev/null; do
            info    "$text"
            sleep   $wait_for_aptd
        done
    fi
}

term_script() {
    local title=''

    if $OPTION_SIMULATE; then
        if $OPTION_GUI; then
            title='Simuleer installatie'
            remove_non_printables "$TEMP_TEXT_FILE"
            if ! zenity --text-info                         \
                        --width         1100                \
                        --height        600                 \
                        --title         "$title"            \
                        --filename      "$TEMP_TEXT_FILE"   \
                        --font          'Ubuntu Mono 12'    \
                        --ok-label      'Oké'               \
                        --cancel-label  'Annuleren'         \
                        2> >($LOGCMD); then
                true
            fi
        else
            cat "$TEMP_TEXT_FILE"
        fi
        QUIET=true
    elif $OPTION_INFO && $INFO_FOUND; then
        printf '%s\n' "$END_INFO" >> "$TEMP_TEXT_FILE"
        if $OPTION_GUI; then
            title='Installatie-instructies'
            if ! zenity --text-info                         \
                        --width         850                 \
                        --height        400                 \
                        --title         "$title"            \
                        --filename      "$TEMP_TEXT_FILE"   \
                        --font          'Ubuntu Mono 12'    \
                        --ok-label      'Oké'               \
                        --cancel-label  'Annuleren'         \
                        2> >($LOGCMD); then
                true
            fi
        else
            less "$LESS_OPTIONS" "$TEMP_TEXT_FILE"
        fi
        QUIET=true
    elif $OPTION_INFO && ! $INFO_FOUND; then
        info 'Geen instructies aanwezig.'
    elif $OPTION_REMOVE_INFO && $REMOVE_INFO_FOUND; then
        printf '%s\n' "$END_REMOVE_INFO" >> "$TEMP_TEXT_FILE"
        if $OPTION_GUI; then
            title='Verwijder-instructies'
            if ! zenity --text-info                         \
                        --width         850                 \
                        --height        400                 \
                        --title         "$title"            \
                        --filename      "$TEMP_TEXT_FILE"   \
                        --font          'Ubuntu Mono 12'    \
                        --ok-label      'Oké'               \
                        --cancel-label  'Annuleren'         \
                        2> >($LOGCMD); then
                true
            fi
        else
            less "$LESS_OPTIONS" "$TEMP_TEXT_FILE"
        fi
        QUIET=true
    elif $OPTION_REMOVE_INFO && ! $REMOVE_INFO_FOUND; then
        info 'Geen instructies aanwezig.'
    elif ! $COMMANDS_FOUND; then
        info 'Geen opdrachten aanwezig.'
    fi
    rm "$TEMP_TEXT_FILE"

    if  $EXECUTE_COMMANDS   &&
        [[ $MAXRC -eq 0 ]]  &&
        $INFO_FOUND         &&
        ! $OPTION_GUI; then
        info "Er zijn aanvullende instructies, gebruik de opdracht:
    ${BLUE}$PROGNAME --info${NORMAL}"
    fi

    if $EXECUTE_COMMANDS && [[ $MAXRC -ne 0 ]]; then
        exit $WARNING
    else
        exit $SUCCESS
    fi
}

process_script() {
    check_input "$@"
    process_input
}

# ##############################################################################
# Main line
# ##############################################################################
main() {
    init_script
    process_script "$@"
    term_script
}

main "$@"

# EOF