script downloading Bing wallpapers

bing-wallpaper.sh

#!/usr/bin/env zsh

# The mkt parameter determines which Bing market you would like to
# obtain your images from.
# Valid values are: en-US, zh-CN, ja-JP, en-AU, en-UK, de-DE, en-NZ, en-CA.
#
# The idx parameter determines where to start from. 0 is the current day,
# 1 the previous day, etc.
#IDX=1
for IDX in 0 1 2
do
#xmlURL="http://www.bing.com/HPImageArchive.aspx?format=xml&idx="$IDX"&n=1&mkt=ja-JP"
xmlURL="http://www.bing.com/HPImageArchive.aspx?format=xml&n=1&idx="
xmlURL+=$IDX
xmlURL+="&mkt=en-US"

# $bing is needed to form the fully qualified URL for
# the Bing pic of the day
bing="www.bing.com"

# $PICTURE_DIR is used to set the location where Bing pics of the day
# are stored.  $HOME holds the path of the current user's home directory
PICTURE_DIR="$HOME/Pictures/Bing/"
# Create PICTURE_DIR if it does not already exist
#mkdir -p $PICTURE_DIR

# The desired Bing picture resolution to download
# Valid options: "_1024x768" "_1280x720" "_1366x768" "_1920x1200"
desiredPicRes="_1920x1200"

# The file extension for the Bing pic
picExt=".jpg"

# Extract the relative URL of the Bing pic of the day from
# the XML data retrieved from xmlURL, form the fully qualified
# URL for the pic of the day, and store it in $picURL

# Form the URL for the desired pic resolution
# using ggrep (gnu grep (homebrew/dupes) not default Mac grep)
desiredPicURL=$bing$(echo $(curl -s $xmlURL) | ggrep -oP "<urlBase>(.*)</urlBase>" | cut -d ">" -f 2 | cut -d "<" -f 1)$desiredPicRes$picExt
echo $desiredPicURL
# Form the URL for the default pic resolution
#defaultPicURL=$bing$(echo $(curl -s $xmlURL) | ggrep -oP "<url>(.*)</url>" | cut -d ">" -f 2 | cut -d "<" -f 1)
#echo $defaultPicURL

# $picName contains the filename of the Bing pic of the day
    picName=${desiredPicURL##*/}
    if [ ! -f $PICTURE_DIR/$picName ]; then
        '/usr/local/bin/terminal-notifier' -title "Bing Wallpaper" -message "Downloading: $picName ..." 1>/dev/null
        # echo "Downloading: $filename ..."
        curl -Lso "$PICTURE_DIR/$picName" $desiredPicURL
    else
        '/usr/local/bin/terminal-notifier' -title "Bing Wallpaper" -message "Skipping: $picName ..." 1>/dev/null
        # echo "Skipping: $filename ..."
    fi
done