Randomly change desktop background

randomBackground

#!/bin/bash
# Changes desktop background to a pseudo-random background

# Set defaults
BG_DIR="$HOME/.backgrounds"
BG_LIST=(`cd $BG_DIR && ls *.{jp{e,}g,png,gif} 2> /dev/null`)
CURRENT_BG="`gsettings get org.gnome.desktop.background picture-uri | tail -c +8`"
NEW_BG=$CURRENT
BG_SET=0
SAME_BG=0
CHANGE_BG=1
WEIGHT_FILE="$BG_DIR/.weightings"
ABORT=0

# Functions
function change_bg () {
   # Find new pseudo-random background
   while [ $BG_SET -eq 0 ]; do
      let "INDEX = $RANDOM % ${#BG_LIST[@]}"
      NEW_BG="$BG_DIR/${BG_LIST[$INDEX]}"
      if [[ "$NEW_BG" != "$CURRENT_BG" || $SAME_BG -eq 1 ]]; then
         BG_SET=1
      fi
   done

   # Change background
   setBackground "$NEW_BG"

   # Change speed dial
   setSpeeddial "$NEW_BG"
}

function create_weights () {
   # Check to see if weight file already exists
   if [ -f $WEIGHT_FILE ]; then
      echo "Weightings file already exists, overwrite?"
      select OPTION in "yes" "no"; do
         if [ "$OPTION" = "yes" ]; then
            rm "$WEIGHT_FILE"
            echo "Overwriting existing file"
         else
            ABORT=1
         fi
         break
      done
   fi

   if [ "$ABORT" -eq 1 ]; then
      echo "Aborting"
   else
      # Get weighting for each background
      for BG in ${BG_LIST[@]}; do
         echo -n "Weighting for $BG: "
         read WEIGHTING
         if [[ $WEIGHTING -ge 0 && $WEIGHTING -lt 10 ]]; then
            echo "$BG:$WEIGHTING" >> $WEIGHT_FILE
         fi
      done
   fi
}

# Process flags
while getopts ":ws" FLAG
do
   case "$FLAG" in
      'w') CHANGE_BG=0 ;;
      's') SAME_BG=1 ;;
      '*') ;;
   esac
done
shift $((--OPTIND))

# Work out which function to call
if [ "$CHANGE_BG" -eq 1 ]; then
   change_bg
else
   create_weights
fi

setBackground

#!/bin/bash
# Sets the given image as the desktop's background image

if [ $# -ne 1 ]; then
    echo "Usage: $0 <image>"
else
    # Log background change
    logger "Changing background to $1"

    # Change background
    gsettings set org.gnome.desktop.background picture-uri "'file://$1'"
fi

setSpeedDial

#!/bin/bash
# Sets Opera's Speed Dial's background image to the given image

# Set default
OPERA_DIR=~/.opera-next

if [ $# -ne 1 ]; then
    echo "Usage: $0 <image>"
else
    # Set background
    sed -i "s:^Filename=.*$:Filename=$1:" $OPERA_DIR/speeddial.ini
fi