sdtp

#!/bin/sh
#
# Copyright (c) 2000-2015 Matthew Pearson <matthewpearson@gmail.com>.
#
# These scripts are free. There is no warranty; your mileage may vary.
# Visit http://creativecommons.org/licenses/by-nc-sa/4.0/ for more details.
#
# $Id$
# paint the root window with an image named on the command line
#

SNAME=`basename $0`
USAGE="usage: $SNAME [-s] [<img>]"
VSAGE="\t-s scale image to fit desktop\n\n\
       \t$SNAME changes the root window graphic to <img> or randomly.\n\n\
       \tThis script looks for files in \$HOME/desktops/XxY/, where XxY\n\
       \tis the resolution of the current display. Users with multiple\n\
       \tdisplays might place images suitable for one screen in\n\
       \t\$HOME/desktops/1024x768/ and ones for another in 1280x852/.\n\
       \tIf no file is set on the command line, one is chosen at random.\n"

serror() {
	printf '%s: %s.\n' $SNAME "$*"
	exit 1
}

RES=`xdpyinfo | awk '/dimensions/ { print $2 }'`
[ $? -eq 0 ] && [ "$RES" ] || serror 'xdpyinfo unavailable'

while getopts lrsh arg
do
    case $arg in
	r)  : ;;		# deprecated
	s)  xvarg="-maxp" ;;
	h)  echo $USAGE
	    printf "$VSAGE"
	    exit 0 ;;
	*)  echo $USAGE
	    exit 1 ;;
    esac
done
shift `expr $OPTIND - 1`

if [ "$1" ]
then
	img=`ls $HOME/desktops/$RES/${1}* 2>/dev/null`
	[ "$img" ] || img=`ls $HOME/desktops/*/${1}* 2>/dev/null`
	[ "$img" ] || img=`ls $HOME/desktops/${1}* 2>/dev/null`
else
	[ -d $HOME/desktops/$RES ] || \
	    serror 'no files exist at current resolution' $RES
	seed=`date +%S`
	filec=`ls $HOME/desktops/$RES | wc -w`
	index=`expr 1 + $seed % $filec`
	img=$HOME/desktops/$RES/`ls $HOME/desktops/$RES | awk "NR == $index"`
fi

[ `echo "$img" | wc -w` -gt 1 ] && \
    serror 'ambiguous image name' \"$1\"
[ -f "$img" ] || serror 'could not find image' \"$1\"

echo "setting desktop to $img..."
exec xv $xvarg -root $img -rmode 5 -quit

#EOF __TAGGED__