#!/bin/bash

##############################################################
# Edita ciertas opciones del GRUB mediante terminal          #
# U. Modificacion: 27-10-2021                                #
# Autor: q3aql                                               #
# Contacto: q3aql@duck.com                                   #
# Licencia: GPL v2.0                                         #
##############################################################
VERSION="1.6"
M_DATE="271021"

# Variables generales
defaultGrub="/etc/default/grub"
defaultGrubFiles="/etc/default/grub.d"
zenigrubInit="${defaultGrubFiles}/zenigrub-init.cfg"
bootGrub="/boot/grub/grub.cfg"
zenigrubDir="/etc/zenigrub"
tmpZenigrub="/tmp/zenigrub.tmp"
zenigrubSedFolder="/tmp/zenigrub/word/"

# Variables
iconPath="/opt/zenigrub-custom/zenigrub-custom.png"
imagesPath="/opt/zenigrub-custom/img"

# Funcion para comprobar permisos de administrador
function comprobarAdministrador() {
  mkdir -p /etc/root &> /dev/null
  administrador=$?
  if [ ${administrador} -eq 0 ] ; then
    rm -rf /etc/root
    mkdir -p ${defaultGrubFiles}
    touch ${zenigrubInit}
  else
    echo ""
    echo "* zenigrub-custom-cli ${VERSION} (${M_DATE})"
    echo ""
    echo "* Administrator permissions are required."
    echo ""
    exit
  fi
}

# Funcion para actualizar el grub
function update-grub() {
  grub-mkconfig -o /boot/grub/grub.cfg
}

# Funcion para comprobar si existen los ficheros necesarios del grub
function comprobarFicheros() {
  if [ -f ${defaultGrub} ] ; then
    if [ -f ${bootGrub} ] ; then
      echo "null" > /dev/null
    else
      echo ""
      echo "* zenigrub-custom-cli ${VERSION} (${M_DATE})"
      echo ""
      echo "+ The file '${bootGrub}' doesn't exist!"
      echo ""
      exit
    fi
  else
    echo "* zenigrub-custom-cli ${VERSION} (${M_DATE})"
    echo ""
    echo "+ The file '${defaultGrub}' doesn't exist!"
    echo ""
    exit
  fi
}

# Funcion para hacer backup de los ficheros
function backupFicheros() {
  mkdir -p ${zenigrubDir}
  if [ -f ${zenigrubDir}/grub ] ; then
    echo "null" > /dev/null
  else
    cp -rfv ${defaultGrub} ${zenigrubDir}
  fi
  if [ -f ${zenigrubDir}/grub.initial ] ; then
    echo "null" > /dev/null
  else
    cp -rfv ${defaultGrub} ${zenigrubDir}/grub.initial
  fi
  if [ -f ${zenigrubDir}/grub.cfg ] ; then
    echo "null" > /dev/null
  else
    cp -rfv ${bootGrub} ${zenigrubDir}
  fi
  if [ -f ${zenigrubDir}/grub.cfg.initial ] ; then
    echo "null" > /dev/null
  else
    cp -rfv ${bootGrub} ${zenigrubDir}/grub.cfg.initial
  fi
}

#

# Funcion para restaurar la configuracion del GRUB
function restaurarConfiguracion() {
  clear
  echo ""
  echo "* zenigrub-custom-cli ${VERSION} (${M_DATE})"
  echo ""
  echo "* The initial or last saved GRUB configuration will be restored!." 
  echo -n "+ [Default: n] Do you want to continue? (y/n): " ; read restore_grub
  if [ -z "${restore_grub}" ] ; then
    echo "null" > /dev/null
  elif [ "${restore_grub}" == "n" ] ; then
    echo "null" > /dev/null
  else
    cp -rfv ${zenigrubDir}/grub ${defaultGrub}
    errorUno=$?
    cp -rfv ${zenigrubDir}/grub.cfg ${bootGrub}
    errorDos=$?
    erroresTotales=$(expr ${errorUno} + ${errorDos})
    if [ ${erroresTotales} -eq 0 ] ; then
      rm -rfv ${zenigrubDir}/grub
      rm -rfv ${zenigrubDir}/grub.cfg
      echo ""
      echo "* GRUB settings have been successfully restored."
      echo ""
      echo -n "+ Press ENTER to continue.. " ; read continue
    else
      echo ""
      echo "* There was a problem restoring the GRUB configuration."
      echo ""
      echo -n "+ Press ENTER to continue.. " ; read continue
    fi
  fi
}

# Funcion para guardar la configuracion del GRUB
function guardarConfiguracionGrub() {
  clear
  echo ""
  echo "* zenigrub-custom-cli ${VERSION} (${M_DATE})"
  echo ""
  echo "* The current configuration will be set as the default." 
  echo -n "+ [Default: n] Do you want to continue? (y/n): " ; read save_grub
  if [ -z "${save_grub}" ] ; then
    echo "null" > /dev/null
  elif [ "${save_grub}" == "n" ] ; then
    echo "null" > /dev/null
  else
    cp -rfv ${defaultGrub} ${zenigrubDir}
    errorUno=$?
    cp -rfv ${bootGrub} ${zenigrubDir}
    errorDos=$?
    erroresTotales=$(expr ${errorUno} + ${errorDos})
    if [ ${erroresTotales} -eq 0 ] ; then
      echo ""
      echo "* GRUB configuration has been saved successfully."
      echo ""
      echo -n "+ Press ENTER to continue " ; read continue
    else
      echo ""
      echo "* There was a problem saving the GRUB configuration."
      echo ""
      echo -n "+ Press ENTER to continue.. " ; read continue
    fi
  fi
}

# Funcion para habilitar las opciones necesarias
function habilitarOpciones() {
  # Habilitar las opciones si se encuentra desactivadas
  sed -i 's/#GRUB_DEFAULT=/GRUB_DEFAULT=/g' "${defaultGrub}" &> /dev/null
  sed -i 's/#GRUB_TIMEOUT=/GRUB_TIMEOUT=/g' "${defaultGrub}" &> /dev/null
  sed -i 's/#GRUB_CMDLINE_LINUX_DEFAULT=/GRUB_CMDLINE_LINUX_DEFAULT=/g' "${defaultGrub}" &> /dev/null
  sed -i 's/GRUB_HIDDEN_TIMEOUT=/#Disabled_GRUB_HIDDEN_TIMEOUT/g' "${defaultGrubFiles}"/* &> /dev/null
  TiempoDesactivado=$(cat ${defaultGrub} | grep "#GRUB_HIDDEN_TIMEOUT=")
  if [ -z "${TiempoDesactivado}" ] ; then
    sed -i 's/GRUB_HIDDEN_TIMEOUT=/#GRUB_HIDDEN_TIMEOUT=/g' "${defaultGrub}" &> /dev/null
  fi
  # Comprobar si las lineas se encuentran agregadas
  comprobarGrubDefault=$(cat ${defaultGrub} | grep "GRUB_DEFAULT=")
  comprobarGrubTimeout=$(cat ${defaultGrub} | grep "GRUB_TIMEOUT=")
  comprobarGrubCmdLineDefault=$(cat ${defaultGrub} | grep "GRUB_CMDLINE_LINUX_DEFAULT=")
  if [ -z "${comprobarGrubDefault}" ] ; then
    echo "GRUB_DEFAULT=\"0\"" > /etc/default/grub.tmp
    cat ${defaultGrub} >> /etc/default/grub.tmp
    cp -rfv /etc/default/grub.tmp ${defaultGrub}
  fi
  if [ -z "${comprobarGrubTimeout}" ] ; then
    echo "GRUB_TIMEOUT=\"10\"" > /etc/default/grub.tmp
    cat ${defaultGrub} >> /etc/default/grub.tmp
    cp -rfv /etc/default/grub.tmp ${defaultGrub}
  fi
  if [ -z "${comprobarGrubCmdLineDefault}" ] ; then
    parametrosAnterior=$(cat "${defaultGrubFiles}"/* | grep "GRUB_CMDLINE_LINUX_DEFAULT=")
    if [ -z "${parametrosAnterior}" ] ; then
      echo "GRUB_CMDLINE_LINUX_DEFAULT=\"\"" > /etc/default/grub.tmp
      cat ${defaultGrub} >> /etc/default/grub.tmp
      cp -rfv /etc/default/grub.tmp ${defaultGrub}
    else
      LineaInicial=2
      cat "${defaultGrubFiles}"/* | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 2 > ${tmpZenigrub}
      parametrosGrub=$(cat ${tmpZenigrub})
      LineaInicial=$(expr ${LineaInicial} + 1)
      parametrosGrubLeido=$(cat "${defaultGrubFiles}"/* | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 1)
      while [ "${parametrosGrubLeido}" != "" ] ; do
        parametrosGrub="${parametrosGrub}=${parametrosGrubLeido}"
        LineaInicial=$(expr ${LineaInicial} + 1)
        parametrosGrubLeido=$(cat "${defaultGrubFiles}"/* | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 1)
      done
      echo "GRUB_CMDLINE_LINUX_DEFAULT=\"${parametrosGrub}\"" > /etc/default/grub.tmp
      cat ${defaultGrub} >> /etc/default/grub.tmp
      cp -rfv /etc/default/grub.tmp ${defaultGrub}
      sed -i 's/GRUB_CMDLINE_LINUX_DEFAULT=/#Disabled_GRUB_CMDLINE_LINUX_DEFAULT/g' "${defaultGrubFiles}"/* &> /dev/null
    fi
  fi
  parametrosAnterior=$(cat "${defaultGrubFiles}"/* | grep "GRUB_CMDLINE_LINUX_DEFAULT=")
  if [ -z "${parametrosAnterior}" ] ; then
    echo "null" > /dev/null
  else
    LineaInicial=2
    cat "${defaultGrubFiles}"/* | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 2 > ${tmpZenigrub}
    parametrosGrubAnterior=$(cat ${tmpZenigrub})
    LineaInicial=$(expr ${LineaInicial} + 1)
    parametrosGrubLeidoAnterior=$(cat "${defaultGrubFiles}"/* | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 1)
    while [ "${parametrosGrubLeidoAnterior}" != "" ] ; do
      parametrosGrubAnterior="${parametrosGrubAnterior}=${parametrosGrubLeidoAnterior}"
      LineaInicial=$(expr ${LineaInicial} + 1)
      parametrosGrubLeidoAnterior=$(cat "${defaultGrubFiles}"/* | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 1)
    done
    LineaInicial=2
    cat "${defaultGrub}" | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 2 > ${tmpZenigrub}
    parametrosGrub=$(cat ${tmpZenigrub})
    LineaInicial=$(expr ${LineaInicial} + 1)
    parametrosGrubLeido=$(cat "${defaultGrub}" | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 1)
    while [ "${parametrosGrubLeido}" != "" ] ; do
      parametrosGrub="${parametrosGrub}=${parametrosGrubLeido}"
      LineaInicial=$(expr ${LineaInicial} + 1)
      parametrosGrubLeido=$(cat "${defaultGrub}" | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 1)
    done
    sed -i "s/GRUB_CMDLINE_LINUX_DEFAULT=\"${parametrosGrub}\"/GRUB_CMDLINE_LINUX_DEFAULT=\"${parametrosGrubAnterior}\"/g" "${defaultGrub}"
    sed -i "s/GRUB_CMDLINE_LINUX_DEFAULT=${parametrosGrub}/GRUB_CMDLINE_LINUX_DEFAULT=\"${parametrosGrubAnterior}\"/g" "${defaultGrub}"
    sed -i 's/GRUB_CMDLINE_LINUX_DEFAULT=/#Disabled_GRUB_CMDLINE_LINUX_DEFAULT/g' "${defaultGrubFiles}"/* &> /dev/null
  fi
}

# Funcion para eliminar espacios
# Sintaxis: eliminarEspacios "<texto>"
function eliminarEspacios() {
  wordToConvert=${1}
  zenigrubSedFile="${zenigrubSedFolder}/zenigrub-${RANDOM}.txt"
  mkdir -p ${zenigrubSedFolder} && chmod 777 -R ${zenigrubSedFolder} 2> /dev/null
  echo "${wordToConvert}" > ${zenigrubSedFile}
  # Borrar espacios
  sed -i 's/ /_/g' "${zenigrubSedFile}" &> /dev/null
  # Mostrar texto convertido
  wordToConvert=$(cat ${zenigrubSedFile})
  echo ${wordToConvert}
}

# Funcion para restaurar los espacios
# Sintaxis: restaEspacios "<texto>"
function restaurarEspacios() {
  wordToConvert=${1}
  zenigrubSedFile="${zenigrubSedFolder}/zenigrub-${RANDOM}.txt"
  mkdir -p ${zenigrubSedFolder} && chmod 777 -R ${zenigrubSedFolder} 2> /dev/null
  echo "${wordToConvert}" > ${zenigrubSedFile}
  # Borrar espacios
  sed -i 's/_/\\ /g' "${zenigrubSedFile}" &> /dev/null
  sed -i 's/\//\\\//g' "${zenigrubSedFile}" &> /dev/null
  # Mostrar texto convertido
  wordToConvert=$(cat ${zenigrubSedFile})
  echo ${wordToConvert}
}

# Funcion para mostrar las entradas del GRUB
function mostrarEntradasGrub() {
  grep 'menuentry "' /boot/grub/grub.cfg | cut -d '"' -f 2 > ${tmpZenigrub}
  grep "menuentry '" /boot/grub/grub.cfg | cut -d "'" -f 2 >> ${tmpZenigrub}
  listaTotal=$(wc -l ${tmpZenigrub} | cut -d " " -f 1)
  listaInicial=1
  listaCompleta=""
  clear
  echo ""
  echo "* zenigrub-custom-cli ${VERSION} ($M_DATE)"
  echo ""
  echo "* List of entries of GRUB:" 
  echo ""
  #echo ${listaCompleta}
  while [ ${listaInicial} -le ${listaTotal} ] ; do
    entradaLeida=$(cat ${tmpZenigrub} | head -${listaInicial} | tail -1)
    entradaLeida=$(eliminarEspacios "${entradaLeida}")
    #listaCompleta="${listaCompleta} ${entradaLeida}"
    echo " - ${entradaLeida}"
    listaInicial=$(expr ${listaInicial} + 1)
  done
  echo ""
  echo -n "+ Press ENTER to continue.. " ; read continue
}

# Funcion para cambiar la entrada por defecto
function cambiarEntradaDefecto() {
  grep 'menuentry "' /boot/grub/grub.cfg | cut -d '"' -f 2 > ${tmpZenigrub}
  grep "menuentry '" /boot/grub/grub.cfg | cut -d "'" -f 2 >> ${tmpZenigrub}
  listaTotal=$(wc -l ${tmpZenigrub} | cut -d " " -f 1)
  listaInicial=1
  listaCompleta=""
  clear
  echo ""
  echo "* zenigrub-custom-cli ${VERSION} ($M_DATE)"
  echo ""
  echo "* Type number of entry in GRUB to set by default:"
  echo ""
  while [ ${listaInicial} -le ${listaTotal} ] ; do
    entradaLeida=$(cat ${tmpZenigrub} | head -${listaInicial} | tail -1)
    entradaLeida=$(eliminarEspacios "${entradaLeida}")
    #listaCompleta="${listaCompleta} ${entradaLeida}"
    echo " ${listaInicial} --> ${entradaLeida}" 
    listaInicial=$(expr ${listaInicial} + 1)
  done
  echo ""
  echo " r --> Return to menu (cancel)"
  echo ""
  echo -n "+ [Default: r] Type option: " ; read option_grub
  if [ -z "${option_grub}" ] ; then
    mostrarMenuPrincipal
  elif [ "${option_grub}" == "r" ] ; then
    mostrarMenuPrincipal
  else
    if [ -z "${option_grub}" ] ; then
      mostrarMenuPrincipal
    else
      expr ${option_grub} + 1 2>/dev/null
      check_number=$?
      if [ ${check_number} -eq 0 ] ; then
        echo ""
        listaInicial=1
        listaTotal=${option_grub}
        while [ ${listaInicial} -le ${listaTotal} ] ; do
          entradaLeida=$(cat ${tmpZenigrub} | head -${listaInicial} | tail -1)
          entradaLeida=$(eliminarEspacios "${entradaLeida}")
          #listaCompleta="${listaCompleta} ${entradaLeida}"
          listaInicial=$(expr ${listaInicial} + 1)
        done
        entradaDefecto=$(cat ${defaultGrub} | grep "GRUB_DEFAULT=" | cut -d "=" -f 2 | cut -d '"' -f 2)
        entradaAnterior=$(eliminarEspacios "${entradaDefecto}")
        entradaAnterior=$(restaurarEspacios ${entradaAnterior})
        nuevaEntrada=$(restaurarEspacios ${entradaLeida})
        echo "* The current entry is '${entradaAnterior}'"
        echo "* It has been defined as main entrance to '${nuevaEntrada}'"
        sed -i "s/GRUB_DEFAULT=\"${entradaAnterior}\"/GRUB_DEFAULT=\"${nuevaEntrada}\"/g" "${defaultGrub}"
        sed -i "s/GRUB_DEFAULT=${entradaAnterior}/GRUB_DEFAULT=\"${nuevaEntrada}\"/g" "${defaultGrub}"
        actualizarGrub
      else
        mostrarMenuPrincipal
      fi
    fi
  fi
}

# Funcion para mostrar la configuracion por defecto
function mostrarConfiguracionActual() {
  entradaDefecto=$(cat ${defaultGrub} | grep "GRUB_DEFAULT=" | cut -d "=" -f 2 | cut -d '"' -f 2)
  tiempoGrub=$(cat ${defaultGrub} | grep "GRUB_TIMEOUT=" | cut -d "=" -f 2 | cut -d '"' -f 2)
  LineaInicial=2
  cat ${defaultGrub} | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 2 > ${tmpZenigrub}
  parametrosGrub=$(cat ${tmpZenigrub})
  LineaInicial=$(expr ${LineaInicial} + 1)
  parametrosGrubLeido=$(cat ${defaultGrub} | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 1)
  while [ "${parametrosGrubLeido}" != "" ] ; do
    parametrosGrub="${parametrosGrub}=${parametrosGrubLeido}"
    LineaInicial=$(expr ${LineaInicial} + 1)
    parametrosGrubLeido=$(cat ${defaultGrub} | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 1)
  done
  clear
  echo "${parametrosGrub}" > ${tmpZenigrub}
  echo ""
  echo "* zenigrub-custom-cli ${VERSION} (${M_DATE})"
  echo ""
  echo "* GRUB configuration:"
  echo ""
  echo " - Default entry: ${entradaDefecto}"
  echo " - GRUB time: ${tiempoGrub}"
  echo " - Boot parameters: ${parametrosGrub}"
  echo ""
  echo -n "+ Press ENTER to continue.. " ; read continue
}

# Funcion para cambiar el tiempo del GRUB
function cambiarTiempoGrub() {
  tiempoGrub=$(cat ${defaultGrub} | grep "GRUB_TIMEOUT=" | cut -d "=" -f 2 | cut -d '"' -f 2)
  clear
  echo ""
  echo "* zenigrub-custom-cli ${VERSION} (${M_DATE})"
  echo ""
  echo -n "* [Current: ${tiempoGrub}] Type the SECONDS that the GRUB will be visible: " ; read time_grub
  tiempoActual=${time_grub}
  if [ -z "${time_grub}" ] ; then
    mostrarMenuPrincipal
  else
    if [ -z "${tiempoActual}" ] ; then
      actualizarGrub
    else
      expr ${tiempoActual} + 1 2>/dev/null
      error_time=$?
      if [ ${error_time} -eq 0 ] ; then
        sed -i "s/GRUB_TIMEOUT=\"${tiempoGrub}\"/GRUB_TIMEOUT=\"${tiempoActual}\"/g" "${defaultGrub}"
        sed -i "s/GRUB_TIMEOUT=${tiempoGrub}/GRUB_TIMEOUT=\"${tiempoActual}\"/g" "${defaultGrub}"
        actualizarGrub
      else
        mostrarMenuPrincipal
      fi
    fi
  fi
}

# Funcion para editar los parametros de arranque
function editarParametrosArranque() {
  # Se cargan los actuales parametros de arranque
  LineaInicial=2
  cat ${defaultGrub} | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 2 > ${tmpZenigrub}
  parametrosGrub=$(cat ${tmpZenigrub})
  LineaInicial=$(expr ${LineaInicial} + 1)
  parametrosGrubLeido=$(cat ${defaultGrub} | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 1)
  while [ "${parametrosGrubLeido}" != "" ] ; do
    parametrosGrub="${parametrosGrub}=${parametrosGrubLeido}"
    LineaInicial=$(expr ${LineaInicial} + 1)
    parametrosGrubLeido=$(cat ${defaultGrub} | grep "GRUB_CMDLINE_LINUX_DEFAULT=" | cut -d "=" -f ${LineaInicial} | cut -d '"' -f 1)
  done
  echo "${parametrosGrub}" > ${tmpZenigrub}
  parametrosGrubMostrar=$(cat ${tmpZenigrub})
  sed -i 's/ /\\ /g' "${tmpZenigrub}" &> /dev/null
  parametrosGrub=$(cat ${tmpZenigrub})
  # Se leen y procesan los nuevos parametros
  clear
  echo ""
  echo "* zenigrub-custom-cli ${VERSION} (${M_DATE})"
  echo ""
  echo "+ Current parameters: ${parametrosGrubMostrar}"
  echo -n "* Type the BOOT PARAMETERS in GRUB: " ; read parametrosActual
  cancelar=$?
  if [ -z "${parametrosActual}" ] ; then
    mostrarMenuPrincipal
  else
    if [ -z "${parametrosActual}" ] ; then
      mostrarMenuPrincipal
    else
      echo ${parametrosActual} > ${tmpZenigrub}
      sed -i 's/ /\\ /g' "${tmpZenigrub}" &> /dev/null
      parametrosActual=$(cat ${tmpZenigrub})
      sed -i "s/GRUB_CMDLINE_LINUX_DEFAULT=\"${parametrosGrub}\"/GRUB_CMDLINE_LINUX_DEFAULT=\"${parametrosActual}\"/g" "${defaultGrub}"
      sed -i "s/GRUB_CMDLINE_LINUX_DEFAULT=${parametrosGrub}/GRUB_CMDLINE_LINUX_DEFAULT=\"${parametrosActual}\"/g" "${defaultGrub}"
      actualizarGrub
    fi
  fi
}

# Funcion para actualizar el GRUB
function actualizarGrub() {
  echo ""
  echo "* Updating GRUB configuration"
  update-grub
  output=$?
  if [ ${output} -eq 0 ] ; then
    echo "* GRUB update process is complete!"
    echo ""
    echo -n "+ Press ENTER to continue.. " ; read continue
  else
    echo "* There was an error in the GRUB update process."
    echo ""
    echo -n "+ Press ENTER to continue.. " ; read continue
  fi
}

# Funcion para mostrar el "acerca" del programa
function mostrarAcerca() {
  clear
  echo ""
  echo "* About:"
  echo ""
  echo " - Software: zenigrub-custom-cli ${VERSION} (${M_DATE})"
  echo " - Author: q3aql"
  echo " - Contact: q3aql@duck.com"
  echo " - License: GPL v2.0"
  echo ""
  echo -n "+ Press ENTER to continue.. " ; read continue
}

# Mostrar menu con todas las opciones
function mostrarMenuPrincipal() {
  mostrarMenu=0
  while [ ${mostrarMenu} -eq 0 ] ; do
    clear
    echo ""
    echo "* zenigrub-custom-cli ${VERSION} (${M_DATE})"
    echo ""
    echo " g --> Show GRUB entries"
    echo " d --> Change default entry"
    echo " t --> Change GRUB time"
    echo " e --> Edit boot parameters"
    echo " c --> Show current settings"
    echo " u --> Update GRUB (update-grub)"
    echo " s --> Save GRUB configuration" 
    echo " r --> Restore GRUB settings"
    echo " a --> About"
    echo ""
    echo " q --> Exit"
    echo ""
    echo -n "* Type the option (example: g): " ; read opcion
    cancelar=$?
    if [ ${cancelar} -eq 1 ] ; then
      mostrarMenu=1
      exit
    else
      if [ "${opcion}" == "g" ] ; then
        mostrarEntradasGrub
      elif [ "${opcion}" == "d" ] ; then
        cambiarEntradaDefecto
      elif [ "${opcion}" == "t" ] ; then
        cambiarTiempoGrub
      elif [ "${opcion}" == "e" ] ; then
        editarParametrosArranque
      elif [ "${opcion}" == "c" ] ; then
        mostrarConfiguracionActual
      elif [ "${opcion}" == "u" ] ; then
        actualizarGrub
      elif [ "${opcion}" == "s" ] ; then
        guardarConfiguracionGrub
      elif [ "${opcion}" == "r" ] ; then
        restaurarConfiguracion
      elif [ "${opcion}" == "a" ] ; then
        mostrarAcerca
      elif [ "${opcion}" == "q" ] ; then
        mostrarMenu=1
        exit
      else
        echo ""
        echo "+ Choose one of the menu options."
        echo ""
        echo "+ Press ENTER to continue.. " ; read continue
      fi
    fi
  done
}

# Iniciar aplicacion
comprobarAdministrador
comprobarFicheros
habilitarOpciones
backupFicheros
mostrarMenuPrincipal