Download.Shirt.Woot.sh

#!/bin/bash

HTMLURL="http://Shirt.Woot.com"
XMLURL="http://Shirt.Woot.com/blog/rss.aspx"
WhereToSave="${HOME}/Pictures/Shirt.Woot"

function ShowUsage {
	echo "$0 - download shirt.Woot detailed images"
	echo "USAGE: $0"
	echo "Fetch the detailed shirt.woot image from Shirt.Woot's webpage at ${HTMLURL} and"
	echo "save it to ${WhereToSave}/.  Then update a link at ${WhereToSave}/Current.png to"
	echo "point to the latest image."
	echo ""
	echo "NOTE:"
	echo "(If you want to use this to get a fresh desktop background every day, you'll"
	echo "want to use that link file as the background.)"
	echo ""
	echo "Arguments:"
	echo "------------"
	echo "  --snarf      Use the XML feed to get the last few days worth of images."
	echo "  --nocurrent  Don\'t update the \"Current.png\" link."
	exit 1
}

function Snarf {
	mkdir ${WhereToSave}
	cd ${WhereToSave}

	#Search the XML to find the URLs of the detail pics, and download them.
	curl -s "${XMLURL}" | grep -i media:content | grep -i detail | \
	 sed -e 's/\.png.*/\.png/' -e 's/.*http:/http:/' | \
	 while read URL
	do			
		wget $URL
	done

}

function Download {
	mkdir -p ${WhereToSave}
	cd ${WhereToSave}

	#Search the HTML to find the URL of the salepic, and download it.
	URL=`curl -s "${HTMLURL}" | grep -i salepic | sed -e 's/\.png.*/\.png/' -e 's/.*http:/http:/'`
	wget ${URL}
}

function MakeCurrent {
	#Find the most recent image.
	MostRecent=`ls "${WhereToSave}/" -t | grep .png | grep -v Current.png | head -1`

	#You must use cat to write over Current.png rather than replacing it with a new copy or link which would change the inode number, and break the desktop manager's file handle.
	cat ${MostRecent} > "${WhereToSave}/Current.png"
}

case $1 in
--help* | help* | --usage* | usage*)
	ShowUsage
	;;
--snarf* | snarf*)
	Snarf
	;;
--nocurrent*)
	Download
	;;
*)
	Download
	MakeCurrent
	;;

esac

exit 0