dusage

#!/bin/sh
# Show disk usage in specified or current folder
# Usage: dusage -args -folder
# Static variables
RED='\033[0;31m'
NC='\033[0m'
BLUE='\033[0;34m'
YELLOW='\033[0;33m'
CYAN='\033[0;36m'
# Functions:

sprint(){
	echo ""
	echo "It is ${YELLOW}highly recommended${NC} to you to use this program as ${CYAN}\"sudo\" or SuperUser${NC} in order to list and see all files in your folders. Anyway, this program perfectly runs without admin permissions"
	echo ""
}

terms_of_service(){
	echo "dusage  Copyright (C) 2017  Javinator_9889"
	echo "   This program comes with ABSOLUTELY NO WARRANTY; for details click link below"
    echo "This is free software, and you are welcome to redistribute it"
    echo "under certain conditions."
    echo "${CYAN}For more information, please click link below: ${NC}"
    echo https://goo.gl/nAjgpH
}

help(){
	echo "Usage: \"dusage [OPTIONAL](-r | --reverse; -d | --directory + PATH; -f | --file; -h | --help; -tos | --Terms)\""
	echo "${RED}-r \t| --reverse: \t${NC}${YELLOW}show files in decreasing order"
	echo "${RED}-d \t| --directory: \t${NC}${YELLOW}show used space in specified directory"
	echo "${RED}-f \t| --file: \t${NC}${YELLOW}show used space by files, not only parent folder"
	echo "${RED}-h \t| --help: \t${NC}${YELLOW}show help${NC}"
	echo "${RED}-tos \t| --Terms: \t${NC}${YELLOW}show Terms of Service${NC}"
}

standard(){
	sprint
	echo "${CYAN}Showing space usage in: $PWD${NC}"
	echo ""
	echo "+------+-----------+"
	echo "| Size | Directory |"
	echo "+------+-----------+"
	du -s -h -x * | sort -h
}

reverse(){
		sprint
        echo "${CYAN}Showing space usage in: $PWD${NC}"
        echo ""
        echo "+------+-----------+"
        echo "| Size | Directory |"
        echo "+------+-----------+"
        if $is_file; then
        	find . -type f  -exec du -s -h -x {} + | sort -hr
        else
        	du -s -h -x * | sort -hr
        fi
}

directory(){
		sprint
        echo "${CYAN}Showing space usage in: $cdirectory${NC}"
        echo ""
        echo "+------+-----------+"
        echo "| Size | Directory |"
        echo "+------+-----------+"
        if $is_file && $is_rev; then
        	find "$cdirectory"* -type f  -exec du -s -h -x {} + | sort -hr
        elif  $is_file; then
        	find "$cdirectory"* -type f  -exec du -s -h -x {} + | sort -h
        elif $is_rev; then
        	du -s -h "$cdirectory"* | sort -hr
        else
        	du -s -h "$cdirectory"* | sort -h
        fi
}

files(){
		sprint
		echo "${CYAN}Showing space usage in: $PWD${NC}"
        echo ""
        echo "+------+-----------+"
        echo "| Size | Directory |"
        echo "+------+-----------+"
        if $is_rev; then
        	find . -type f  -exec du -s -h -x {} + | sort -hr
        else
        	find . -type f  -exec du -s -h -x {} + | sort -h
        fi
}

# Main
cdirectory=
is_rev=false
is_file=false
is_dir=false
case "$1" in
  -d | --directory)	shift
					cdirectory=$1
					shift
					case "$1" in
					  -r | --reverse)	shift
										is_rev=true
										case "$1" in
										  -f | --file)	shift
														is_file=true
														directory
														;;
										  "")			directory
														;;
										  *)			echo "${RED}NON-ADMITTED OPTION${NC}"
														;;
										esac
										;;
					  -f | --file)	shift
									is_file=true
									case "$1" in
									  -r | --reverse)	shift
														is_rev=true
														directory
														;;
									  "")				directory
														;;
									  *)				echo "${RED}NON-ADMITTED OPTION${NC}"
														;;
									esac
									;;
					  "")			directory
									;;
					  *)			echo "${RED}NON-ADMITTED OPTION${NC}"
									;;
					esac
					;;
  -r | --reverse)	shift
					is_rev=true
					case "$1" in
					  -d | --directory)	shift
										is_dir=true
										cdirectory=$1
										shift
										case "$1" in
										  -f | --file)	shift
														is_file=true
														directory
														;;
										  "")			directory
														;;
										  *)			echo "${RED}NON-ADMITTED OPTION${NC}"
														;;
										esac
										;;
					  -f | --file)	shift
									is_file=true
									case "$1" in
									  -d | --directory)	shift
														is_dir=true
														cdirectory=$1
														directory
														;;
									  "")				reverse
														;;
									  *)				echo "${RED}NON-ADMITTED OPTION${NC}"
														;;
									esac
									;;
					  "")			reverse
									;;
					  *)			echo "${RED}NON-ADMITTED OPTION${NC}"
									;;
					esac
					;;
  -f | --files)		shift
					is_file=true
					case "$1" in
					  -r | --reverse)	shift
										is_rev=true
										case "$1" in
										  -d | --directory)	shift
															is_dir=true
															cdirectory=$1
															directory
															;;
										  "")				files
															;;
										  *)				echo "${RED}NON-ADMITTED OPTION${NC}"
															;;
										esac
										;;
					  -d | --directory)	shift
										is_dir=true
										cdirectory=$1
										shift
										case "$1" in
										  -r | --reverse)	shift
															is_rev=true
															directory
															;;
										  "")				directory
															;;
										  *)				echo "${RED}NON-ADMITTED OPTION${NC}"
															;;
										esac
										;;
					  "")				files
										;;
					  *)				echo "${RED}NON-ADMITTED OPTION${NC}"
										;;
					esac
					;;
  -h | --help)		shift
					help
					;;
  -tos | --Terms)	terms_of_service
					;;
  "")				standard
					;;
  *)				echo "Type ${CYAN} \"dusage -h\"${NC} in order to get help and see how this program works"
					;;
esac