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#!/bin/bash
###################################################################################################
# drive-empty-trash
###################################################################################################
# Copyright 2017-2022 Jean-Christophe Manciot <jcmanciot@sdxlive.com>
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 
# in compliance with the License. You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# This script is using a project hosted at https://github.com/odeke-em/drive, originally developed 
# by Burcu Dogan while working on the Google Drive team and now maintained by Emmanuel T Odeke.
#
# Attribution — You must give appropriate credit, provide a link to the license, and indicate if 
#               changes were made. You may do so in any reasonable manner, but not in any way that 
#               suggests the licensor endorses you or your use.
###################################################################################################

###################################################################################################
#
# Emptying the trash will permanently delete all trashed objects.
# ***Caution***: They cannot be recovered after running this command.
#
###################################################################################################
#
# Requirements:
# ------------
#
# - We assume that:
#       + drive-google package is already installed.
#       + zenity package is already installed.
#
# - This command must be called from your <google_drive_folder>.
#
###################################################################################################
#
# Parameters:
# ----------
#
# - <anything> will display this help message
#
###################################################################################################
#
# Usage example:
# -------------
#
# cd ~/<google_drive_folder>
# drive-empty-trash
#
###################################################################################################
if [[ $LOG_DRIVE_EMPTY_TRASH == ON ]]; then
        # Getting the last existing file descriptor of ~/.drive-google/logs/drive-google.log
        fd=$(ls -al /proc/$$/fd | grep ~/.drive-google/logs/drive-google.log | sed -E 's|^.* ([0-9]+) -> .*$|\1|g' | sort -V | tail -n 1)

        # Case where fd is unset, i.e the file ~/.drive-google/logs/drive-google.log has not yet been opened
        if [[ -z $fd ]]; then
                lowest_unused_fd () 
                {
                        local fd=0
                        while [ -e /proc/$$/fd/${fd} ]; do
                                fd=$((fd+1))
                        done
                        echo $fd
                }
                fd=$(lowest_unused_fd)

                # Opening ~/.drive-google/logs/drive-google.log as file descriptor $fd for appending
                eval "exec $fd>> ~/.drive-google/logs/drive-google.log"
        fi

        # Writing the trace output generated when set -x is enabled to file descriptor $fd 
        eval "BASH_XTRACEFD=$fd"
        # Logging line numbers - We could also use ${0} for ${BASH_SOURCE}
        BASH_SOURCE_BASENAME=$(basename ${BASH_SOURCE})
        export PS4='${BASH_SOURCE_BASENAME}.${LINENO}+ '
        # Expanding all variables and prints the full commands before output of the command
        set -x
fi

# Preventing globbing (pathname expansion)
set -o noglob
# Allowing extended globbing
shopt -s extglob

parameter=$1

# Checking for no parameter
if [[ $# -eq 0 ]]; then
        zenity --question --text "Do you confirm emptying your Google Drive trash online?\n\nThose objects cannot be recovered remotely after running this command." --width 800
        if [[ $? -eq 0 ]]; then
                # OK has been selected
                drive emptytrash 2>&1 | zenity --text-info --title "Emptied Google Drive trash online" --width 1000 --height 200
        else
                zenity --warning --title "Do you confirm emptying your Google Drive trash online?" --text="Operation cancelled" --width=800
                exit 3
        fi

        exit 0
else
        # Any parameter
        end_of_help_message_line_number=$(awk '/^if \[\[ \$LOG_/{ print NR; exit }' $(which drive-empty-trash))
        ((end_of_help_message_line_number--))
        awk -v var=$end_of_help_message_line_number 'NR >= 20 && NR <= var' $(which drive-empty-trash) | zenity --text-info --title "drive-empty-trash help" --width 1150 --height 1000
        exit 1
fi