Resize Vector source image for AppIcon

mk-appicon.py

#!/usr/bin/env python3
# Script to create all required sizes and resolutions of AppIcon files
# from a vector PDF file. Updates the AppIcon.appiconset/Contents.json
#
# Available:
# https://gist.github.com/stephenhouser/cdc18be41d2d49ba9292
#
# Based on: http://blog.paddlefish.net/?p=983
# Updated to include 3x (generic actually) size icon creation. 
#
import re
import json
from subprocess import call
from pprint import pprint

# Required File and Directory Locations
source_pdf = 'Assets/AppIcon.pdf'
asset_catalogs = ['Design Show Server/Images.xcassets/AppIcon.appiconset', 'Design Show/Images.xcassets/AppIcon.appiconset'] 

for iconset in asset_catalogs:
	json_data=open(iconset + '/Contents.json')
	newdata = []

	data = json.load(json_data)
	for img in data["images"]:
		size = int(re.sub(r'x.+$','', img["size"]))
		filename='{idiom:s}_{size:d}_{scale}.png'.format(idiom=img["idiom"],scale=img["scale"],size=size)
		filepath='{iconset:s}/{filename:s}'.format(iconset=iconset,filename=filename)
        
		scale_match = re.match(r'(\d+)x', img["scale"])
		if scale_match:
			size = size * int(scale_match.group(1))
			print("scale =", int(scale_match.group(1)))

		newdata.append({ "filename" : filename, "size" : img["size"], "idiom" : img["idiom"], "scale" :img["scale"] })
        
		print('{filename:s} size={size:d}'.format(filename=filename,size=size))
		call(['sips', '-s', 'format', 'png', '-Z', str(size), '-o', filepath, source_pdf])
        
	json_data.close()
	contents_file = open(iconset + '/Contents.json', "w")
	contents_file.write( json.dumps({ "images" : newdata, "info" : { "version" : 1, "author" : "andy's python script" }}) )
	contents_file.close()