kde_wallpaper.sh

#!/bin/bash
set -e
WALLPAPER_PATH="$HOME/Bilder/Sample Pictures/"


create_queue() {
    find $WALLPAPER_PATH -type f -iregex '.*\.\(jpg\|gif\|png\|jpeg\)$' > /tmp/krawall_queue
}
 
shuffle_wallpapers() {
    cat /tmp/krawall_queue | shuf -n 1 > /tmp/krawall_head
}

# shuffle wallpaper queue, or create it
if [[ ! -f "/tmp/krawall_queue" ]] ; then
    create_queue
else
 
    if [[( $1 == "--prev") || $1 == "-p"  ]] ; then
        NEXT_WALLPAPER="$(cat /tmp/krawall_head 2>/dev/null)"
    fi
 
    if [[( $1 == "--next") || $1 == "-n" ]] ; then
        shuffle_wallpapers
        NEXT_WALLPAPER="$(cat /tmp/krawall_head 2>/dev/null)"
    fi
 
    if [[( $1 == "--resort") || $1 == "-r"  ]] ; then
        shuffle_wallpapers
        echo -e "Successfully randomized the wallpaper list\n"
        exit 0
    fi
 
    if [[( $1 == "--rescan") || $1 == "-s"  ]] ; then
        rm -f /tmp/krawall_queue > /dev/null
        create_queue
        echo -e "Successfully created the wallpaper list\n"
        exit 0
    fi
 
fi

# kde4 way...
kde4_script=$(mktemp) && cat > $kde4_script \
<<_EOF
  var wallpaper = "$NEXT_WALLPAPER";
  var activity = activities()[0];
  activity.currentConfigGroup = ["Wallpaper","image"];
  activity.writeConfig("wallpaper", wallpaper);
  activity.writeConfig("userswallpaper", wallpaper);
  activity.reloadConfig();
_EOF
 
# Run the above javascript, then remove the temp file
qdbus org.kde.plasma-desktop /MainApplication loadScriptInInteractiveConsole $kde4_script > /dev/null && rm -f "$kde4_script"
 
# Let's reparse the configuration
dbus-send --dest=org.kde.plasma-desktop /MainApplication org.kde.plasma-desktop.reparseConfiguration
dbus-send --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.ReloadConfig
dbus-send --dest=org.kde.kwin /KWin org.kde.KWin.reloadConfig
 
# Run again to be sure, because I don't know what I do
#qdbus org.kde.plasma-desktop /MainApplication reparseConfiguration
#qdbus org.freedesktop.DBus /org/freedesktop/DBus ReloadConfig
#qdbus org.kde.kwin /KWin reconfigure
 
 
# This is stupid! I don't want to restart plasma, but have to? Isn't there a better way????????
kbuildsycoca4 2>/dev/null && kquitapp plasma-desktop 2>/dev/null ; kstart plasma-desktop > /dev/null 2>&1