zulip/assets/favicon/generate

#!/usr/bin/env python2.7
from __future__ import absolute_import
import xml.etree.ElementTree as ET
import subprocess
from six.moves import range

# Generates the favicon images containing unread message counts.

# Open the SVG and find the number text elements using XPath
tree  = ET.parse('orig.svg')
elems = [tree.getroot().findall(
    ".//*[@id='%s']/{http://www.w3.org/2000/svg}tspan" % (name,))[0]
     for name in ('number_back', 'number_front')]

for i in range(1, 100):
    # Prepare a modified SVG
    s = '%2d' % (i,)
    for e in elems:
        e.text = s
    with open('tmp.svg', 'w') as out:
        tree.write(out)

    # Convert to PNG
    subprocess.check_call(['inkscape', '--without-gui', '--export-area-page',
        '--export-png=../../static/images/favicon/favicon-%d.png' % (i,),
        'tmp.svg'])