Variety - custom set_wallpaper script for KDE

set_wallpaper

#!/bin/bash
# KDE - User will have to manually choose ~/Pictures/variety-wallpaper/ as a slideshow folder with a short iterval.
# Afterwards, with the command below, Variety will just overwrite the single file there when changing the wallpaper
# and KDE will refresh it
if [ "`env | grep KDE_FULL_SESSION | tail -c +18`" == "true" ]; then
    mkdir -p "$(xdg-user-dir PICTURES)/variety-wallpaper"
    NEWWP="$(xdg-user-dir PICTURES)/variety-wallpaper/wallpaper-kde-$RANDOM.jpg"
    cp "$WP" "$NEWWP"
    touch "$NEWWP"
    PWDIR=`pwd`
    cd "$(xdg-user-dir PICTURES)/variety-wallpaper/"
    ls -tr "$(xdg-user-dir PICTURES)/variety-wallpaper/" | head -n -1 | xargs --no-run-if-empty rm
    echo "[Desktop Entry]" > metadata.desktop
    # Recover PNG extension
    TYPE=$(file -b $NEWWP)
    [[ $TYPE == PNG\ image\ data* ]] && mv "$NEWWP" "$(dirname "$NEWWP")/$(basename "$NEWWP" .jpg).png" 
    cd "$PWDIR"

    # Repeat for second desktop
    mkdir -p "$(xdg-user-dir PICTURES)/variety-wallpaper-2"
    NEWWP="$(xdg-user-dir PICTURES)/variety-wallpaper-2/wallpaper-kde-$RANDOM.jpg"
    cp "$WP" "$NEWWP"
    touch "$NEWWP"
    PWDIR=`pwd`
    cd "$(xdg-user-dir PICTURES)/variety-wallpaper-2/"
    ls -tr "$(xdg-user-dir PICTURES)/variety-wallpaper-2/" | head -n -1 | xargs --no-run-if-empty rm
    echo "[Desktop Entry]" > metadata.desktop
    # Recover PNG extension
    TYPE=$(file -b $NEWWP)
    [[ $TYPE == PNG\ image\ data* ]] && mv "$NEWWP" "$(dirname "$NEWWP")/$(basename "$NEWWP" .jpg).png" 
    cd "$PWDIR"
    exit 0
fi