Automate icon/splashscreen creation for PhoneGap

createimages.py

'''
Given an SVG in the same directory ('./res/' by default),
iterates and creates new icons and splashscreens for 
the PhoneGap Hello World Template
'''
import sys, os, subprocess

from PIL import Image

def createImages (logo_file_name = 'logo.svg', bg_color = '#ffffff', logo_name = 'project'):
    '''
        NOTE: phonegap hello world example splashscreens and icons must exist (to use their files for sizes)
        * pass an svg filename to use to create jpgs and pngs splashscreens and icons
        * pass a bg_color for splashscreens
        * pass a logo_name to overwrite 'Default' and 'Drawable' in the default files
    '''
    realpath = os.path.dirname(os.path.realpath(__file__))

    svg_file = os.path.join(realpath, logo_file_name)

    print 'SVG file : %s' % svg_file

    # ignoring windows and blackberry (add their directories if you care)
    icon_android = './icon/android/'
    icon_ios = './icon/ios/'
    screen_android = './screen/android/'
    screen_ios = './screen/ios/'

    def replaceIcons (the_dir) :

        os.chdir(the_dir)

        for filename in os.listdir('.'):
            image_file = Image.open(filename)
            size = '%dx%d' % image_file.size
            
            filename = filename.replace('drawable', logo_name)

            subprocess.call(['convert', 
                '-density', '300', 
                '-resize', size, 
                '-extent', size,
                '-gravity', 'center', 
                '-background', 'none', 
                svg_file, 
                filename])

        os.chdir(realpath)

    def replaceScreen (the_dir) :
        os.chdir(the_dir)

        for filename in os.listdir('.'):
            image_file = Image.open(filename)
            width, height = image_file.size
            size = '%dx%d' % image_file.size
            
            # needs padding (using 40% for padding)
            icon_size = '%dx%d' % (
                int(width*0.6),
                int(height*0.6),
                )
            filename = filename.replace('drawable', logo_name)
            filename = filename.replace('Default', logo_name)

            subprocess.call(['convert', 
                '-density', '300', 
                '-resize', icon_size, 
                '-extent', size, 
                '-gravity', 'center', 
                '-background', bg_color, 
                svg_file, 
                filename])

        os.chdir(realpath)

    replaceIcons(icon_android)
    replaceIcons(icon_ios)
    replaceScreen(screen_android)
    replaceScreen(screen_ios)
    
if __name__ == '__main__':
    createImages(*sys.argv[1:])
    
    # example
    # createImages abtom.svg #5bc0de abtom