Generate XML for dynamic gnome wallpapers

dynamic-gnome-wallpaper.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
Generates a dynamic-gnome-wallpaper XML file on STDOUT
with images provided as arguments
To be called like:
$ python dynamic-gnome-wallpaper.py ~/Pictures/*.png > ~/Pictures/dynamic-gnome-wallpaper.xml
"""

import sys
import re

# if no args
if len(sys.argv) < 2:
    print("Give this script some datas!")
    exit(0)
else:
    # keep only images in args list
    R = re.compile(".*(jpg|gif|png)")
    IMG_LIST = list(filter(R.match, sys.argv))
    XML = """<background>
  <starttime>
    <year>2011</year>
    <month>11</month>
    <day>24</day>
    <hour>7</hour>
    <minute>00</minute>
    <second>00</second>
  </starttime>
  
  """

for index, value in enumerate(IMG_LIST):
    # loop final element with first
    if index == len(IMG_LIST[:-1]):
        next_element = IMG_LIST[0]
    else:
        next_element = IMG_LIST[index+1]

    XML += """
  <static>
    <duration>600.0</duration>
    <file>{current_file}</file>
  </static>

  <transition type="overlay">
    <duration>1.0</duration>
    <from>{current_file}</from>
    <to>{next_file}</to>
  </transition>

""".format(current_file=value, next_file=next_element)

XML += "</background>"
print(XML)