make-macos-icon

#!/bin/bash

print_help () {
	echo "make-macos-icon 1.0"
	echo "Converts an icon to all requires sizes to use in Xcode"
	echo "Try --help for help using this tool"
}

print_man () {
	echo "Icon Resize"
	echo
	echo "USAGE: "
	echo "icon_resize [file]"
	echo
	echo "OUTPUT: "
	echo "Every required file with the correct extension"
}

save () {
	org=$1
	dirname=$2
 	ext=$3
	_size=$4
	
	filename=$(basename "$org")
	extension="${filename##*.}"
	filename="${filename%.*}"
	
	new="$dirname/$filename$ext.$extension"
	cp "$org" "$new"
	
	sips -z $_size $_size $new > /dev/null
}

if [[ $# -eq 1 ]]
then
	if [[ "$1" == "--help" ]]
	then
		print_man
		exit
	fi

	file="$1"
	
	if [ -f $file ]; then
		echo "Processing image…"
		save $file $(dirname "$file") "512@2x" 1024
		save $file $(dirname "$file") "512" 512
    		save $file $(dirname "$file") "256@2x" 512
    		save $file $(dirname "$file") "256" 256
    		save $file $(dirname "$file") "128@2x" 256
    		save $file $(dirname "$file") "128" 128
    		save $file $(dirname "$file") "32@2x" 64
    		save $file $(dirname "$file") "32" 32
    		save $file $(dirname "$file") "16@2x" 32
    		save $file $(dirname "$file") "16" 16
		
		echo "Done"
	else
		echo "File doesn't exist"
		echo 
		print_help
	fi
else 
	echo "Too few arguments"
	echo
	print_help
fi