Generate auto changing wallpater XML file for GNOME

bgxml-gen

#!/bin/bash

#finishing script function
die()
{
	if ! [ -z $2 ]
	then
		rm -f $2
	fi
	echo "Exiting..."
	exit $1
}

# Usage: bgxml-gen [<path> [<duration in minutes> [<animation duration in seconds>]]]

V=$1
if [ -z $V ]
then
	V=$PWD
elif ! [ -d $V ]
then
	echo "Error: $V: Not a directory"
	die 1
fi
V=$(realpath $V)


TIME=$2
if [ -z $TIME ]
then
	TIME=15
fi
echo "The time was set to $TIME minutes."

TIME=$(($TIME*60))

ANIMATION=$3
if [ -z $ANIMATION ]
then
	ANIMATION=0
fi
echo "The animation time was set to $ANIMATION seconds."

FILES=.file-$RANDOM

echo "The temp file is $FILES."
echo "Searching images in $V."

#searching for files
for EXT in jpg jpeg png gif svg
do
	find "$V" -iname "*.$EXT" | sort -d >> $FILES
done

LINES=$(wc -l < "$FILES")

if [ $LINES -eq 0 ]
then
	echo "No images was found in the directory."
	die 2 $FILES
fi


BACK="$HOME/.config/background.xml"
echo "The name of the xml file is $BACK."
echo "Creating the xml file."

echo "<!-- GENERATED WITH XML BACKGROUND CREATOR SCRIPT (bgxml-gen) -->" > "$BACK"

echo "<background>
  <starttime>
    <year>2009</year>
    <month>08</month>
    <day>04</day>
    <hour>00</hour>
    <minute>00</minute>
    <second>00</second>
  </starttime>" >> "$BACK"


for ((i = 2; i <= $LINES; ++i)); do
	FROM=$(sed -n "$(($i-1))p" "$FILES")
	TO=$(sed -n "${i}p" "$FILES")
	echo "  <static>
    <duration>$TIME.0</duration>
    <file>$FROM</file>
  </static>
  <transition>
    <duration>$ANIMATION.0</duration>
    <from>$FROM</from>
    <to>$TO</to>
  </transition>" >> "$BACK"
done

FROM=$(sed -n 1p $FILES)

echo "  <static>
    <duration>$TIME.0</duration>
    <file>$TO</file>
  </static>
  <transition>
    <duration>$ANIMATION.0</duration>
    <from>$TO</from>
    <to>$FROM</to>
  </transition>" >> "$BACK"
echo "</background>" >> "$BACK"
echo "The xml file was created."

echo "Putting the $BACK file as background."
gsettings set org.gnome.desktop.background picture-uri file://$BACK

echo "Deleting the temp file and finishing the execution."
die 0 $FILES