simpledesktop_downloader.py

#!/usr/bin/env python
"""
A simple script that downloads the first page wallpapers from Simple
Desktops <http://simpledesktops.com/browse/>.

Copyright (c) 2010, Myles Braithwaite <me@mylesbraithwaite.com>
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

* Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in
  the documentation and/or other materials provided with the
  distribution.

* Neither the name of the Monkey in your Soul nor the names of its
  contributors may be used to endorse or promote products derived
  from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
"""

import os
import sys
import urllib
import urllib2
from BeautifulSoup import BeautifulSoup, SoupStrainer

__version__ = '0.1'
__project_name__ = 'SimpleDesktopDownloader'
__project_link__ = 'http://gist.github.com/498353'

SIMPLEDESKTOPS_URL = 'http://simpledesktops.com/browse/'

divs = SoupStrainer('div')

def get_html(url):
    request = urllib2.Request(url)
    request.add_header('User-Agent', '%s/%s +%s' % (
        __project_name__, __version__, __project_link__
    ))
    opener = urllib2.build_opener()
    return opener.open(request).read()

def get_pages(url):
    page_num = 1
    page_num_urls = [ ]
    
    while True:
        page_url = url + str(page_num) + '/'
        
        try:
            html = get_html(page_url)
        except urllib2.HTTPError:
            break
        
        page_num = page_num + 1
        page_num_urls += [ page_url, ]
    
    return page_num_urls

def get_wallpaper_urls(html):
    soup = BeautifulSoup(html, parseOnlyThese=divs)
    
    desktops = soup.findAll('div', attrs={ 'class': "desktop" })
    
    wallpaper_urls = []
    
    for desktop in desktops:
        wallpaper_urls += [ desktop.find('a')['href'], ]
    
    return wallpaper_urls

def get_wallpaper(wallpaper_url, output_path):
    filename = wallpaper_url.split("/")[-1]
    outpath = os.path.join(output_path, filename)
    urllib.urlretrieve(wallpaper_url, outpath)

def main(output_path):
    wallpaper_urls = []
    
    for page_url in get_pages(SIMPLEDESKTOPS_URL):
        html = get_html(page_url)
        wallpaper_urls += get_wallpaper_urls(html)
    
    for url in wallpaper_urls:
        get_wallpaper(url, output_path)

if __name__ == "__main__":
    output_path = sys.argv[-1]
    main(output_path)