random-wallpaper.sh

#/bin/bash

# Author : Quentin Manfroi
# Year : 2013


DEFAULT_DELAY=900
DEFAULT_WALL_DIR=${HOME}/.wallpapers/
DB_DIR="${HOME}/.random_wallpapers"

DELAY=
DIRECTORIES=
VERB=1
CLEAN=0

usage()
{
cat << EOF
Usage :	$0 [-dr] [WALLPAPERS DIRECTORIES LIST]
OR:	$0 -n [WALLPAPERS DIRECTORIES LIST]
OR:	$0 -c [WALLPAPERS DIRECTORIES LIST]

Script to set a random wallpaper for OpenBox environment.

Prerequites : nitrogen
Note : each wallpaper directory must be a absolute path separated by a space
example : $0 /path/rep1 /path/rep2 ... /path/repN

OPTIONS:
   -h       Show this help message
   -n       Set a random wallpaper just once
   -d       Set the delay between each change in seconds
   -c       Clean the database
   -s       Run script in silence without prompt message
   -r	    Enable recursion to list directories

EOF
}

init()
{
	if [[ -z $DELAY ]] #|| [[ -z $SERVER ]] || [[ -z $PASSWD ]]
	then
        	DELAY=$DEFAULT_DELAY
	fi
	DIRECTORIES=$@
	if [[ -z $DIRECTORIES ]]
        then
                DIRECTORIES=$DEFAULT_WALL_DIR
	else
		TMP_DIRECTORIES=
		for DIRECTORY in $DIRECTORIES
		do
			if [[ -d $DIRECTORY ]]
			then
				TMP_DIRECTORIES="$TMP_DIRECTORIES $DIRECTORY"
			elif [[ $CLEAN == 0 ]]
			then
				TMP_DIRECTORIES="$TMP_DIRECTORIES $DIRECTORY"
			fi
		done

		if [[ -z $TMP_DIRECTORIES ]]
		then
			echo "None of directories specified exists"
			exit -1
		else
			DIRECTORIES=$TMP_DIRECTORIES
		fi
	fi

	if [[ ! -d $DB_DIR ]]
	then
        	mkdir -p $DB_DIR
	fi
}

parse()
{
	DB_NAME=
	for DIRECTORY in $DIRECTORIES
	do
		if [[ `echo $DIRECTORY | head -c 2` == "~/" ]]
		then
			TMP_DB_NAME=${DIRECTORY:2}
		else
			TMP_DB_NAME=$DIRECTORY
		fi
		TMP_DB_NAME=${TMP_DB_NAME//\//-}
		TMP_DB_NAME=${TMP_DB_NAME//~/-}
		if [[ `echo $TMP_DB_NAME | tail -c 2` == "-" ]]
		then
			TMP_DB_NAME=${TMP_DB_NAME%?}
		fi
		while [[ `echo $TMP_DB_NAME | head -c 1` == "-"  ]]
		do
			TMP_DB_NAME=${TMP_DB_NAME:1}
		done
		if [[ `echo $TMP_DB_NAME | head -c 1` == "."  ]]
		then
			TMP_DB_NAME=${TMP_DB_NAME:1}
		fi
		DB_NAME="$DB_NAME-$TMP_DB_NAME"
	done
	echo $DB_NAME
}

change()
{
	DB_FILE="$DB_DIR/$(parse).db"
	WALLPAPER=
	if [[ $RECURSIVE -eq 1 ]]
	then
		WALLPAPERS=`for i in $DIRECTORIES ; do find $i -type f -regex '.*\.\(jpeg\|jpg\)$' ; done`
	else
		WALLPAPERS=`for i in $DIRECTORIES ; do find $i -maxdepth 1 -type f -regex '.*\.\(jpeg\|jpg\)$' ; done`
	fi
	if [[ ! -f $DB_FILE ]]
	then
		WALLPAPER=`echo $WALLPAPERS | sed -e 's/ /\n/g' | sort -R | head -1`
	else
		if [[ `echo $WALLPAPERS | sed -e 's/ /\n/g'` == `sort $DB_FILE` ]]
		then
			WALLPAPER=`echo $WALLPAPERS | sed -e 's/ /\n/g' | sort -R | head -1`
			rm -f $DB_FILE

		else
			WALLPAPER=`comm -23 <(echo $WALLPAPERS | sed -e 's/ /\n/g' | sort) <(sort $DB_FILE) | sort -R | head -1`
		fi
	fi
	nitrogen --set-scaled $WALLPAPER
	echo $WALLPAPER >> $DB_FILE
}

clean()
{
	if [[ $VERB -eq 1 ]]
        then
                read -p "Are you sure to would delete database for : $DIRECTORIES ? [y/n] " rep
                case $rep in
                        [Nn]* )
                                exit 0
                                ;;
                esac

        fi
	rm -f $DB_DIR/$(parse).db
}

ARGS=0
while getopts "hrncsid:" OPTION
do
	case $OPTION in
	h)
		usage
		exit 1
		;;
	d)
		DELAY=$OPTARG
		ARGS="$(($ARGS+2))"
		;;
	n)
		shift
		init $@
		change
		exit 0
		;;
	c)
		ARGS="$(($ARGS+1))"
		CLEAN=1
		;;
	s)
		ARGS="$(($ARGS+1))"
		VERB=0
		;;
	r)
		RECURSIVE=1
		ARGS="$(($ARGS+1))"
		;;
	?)
		usage
		exit
		;;
	esac
done

if [[ $CLEAN -eq 1 ]]
then
	if [[ $1 == "-sc" ]] || [[ $1 == "-cs" ]]
	then
		let "ARGS = $ARGS - 1"
	fi
	for i in `seq 1 $ARGS`
	do
		shift
	done
	init $@
	clean
	exit 0
else
	if [[ $1 == "-rd" ]]
	then
		shift $(($ARGS-1))
	else
		shift $ARGS
	fi
	init $@
fi

while :
do
	change
	sleep $DELAY
done