#!/bin/bash
#####################################################################
# Name: flickrfavsaver.sh
#
# Downloads Flickr!-Favorites from the Flickr!-Favorites RSS Feed
# of a user. In combination with a slide-show screensaver you get 
# your personal Flickr!-favs screensaver.
#
# Usage: Put in some directory and run from your crontab, point your 
#        slideshow-screensave to that dir. Be sure to adjust the
#        variable favs_rss to your favs-rss feed.
#
# Requires: xsltproc, aria2c and the file parse_enclosure.xsl
#           which must be located in the same dir as the script.
#           parse_enlcosure.xsl can be obtained from
#           http://lincgeek.org/bashpodder/
#
# Author: C. Herenz (christian.herenz <at> student.hu-berlin.de) 
# Date: 2010/07/31
#####################################################################

favs_rss='http://api.flickr.com/services/feeds/photos_faves.gne?nsid=66423646@N00&lang=en-us&format=rss_200_enc'
# adjust this variable to your flickr!-favorites rss feed
# note: the feed link is provided on your flickr!-favorites page, but  
# afaik you have to add _enc at the end to get enclosures
# (as an example I set it to my rss feed)


cd $(dirname $0) # crontab-friendly :-)

# cleanup & fetch rss
test -s favs.rss && rm favs.rss || true
aria2c  -q -s1 $favs_rss -o favs.rss 
# fetch images, if rss fetch was sucsessfull
test -s favs.rss && xsltproc parse_enclosure.xsl favs.rss | aria2c -q \
    -s2 --allow-overwrite=false \
    --auto-file-renaming=false -d ./Images -i -

# delete thumbnail-sized images, because they would look ugly in slide-show
du -s ./Images/* | while read size name; do
if [ $size -lt 100 ]; then 
rm $name
fi 
done

# delete images older than 60 days,
# but only if after that more than 10 images would be left
files=$(ls -l ./Images | wc -l)
oldfiles=$(find ./Images -mtime +60 | wc -l)
if [ $(($files - $oldfiles)) -gt 10 ]; then
find ./Images -mtime +60 -delete
fi