#!/bin/sh
#
# Display an image with conversion as necessary
#

CMD=$(basename $0)
MAGIC=/usr/share/misc/magic-mm
SHOWTIME=20
SLEEPTIME=2

usage()
{
    echo "usage: $CMD [-s] file" >&2
    exit 1
}

while getopts ":s" c
do
    case "$c" in
    s)     slide=1;;
    :|'?') usage;;
    esac
done
shift $(($OPTIND - 1))
[ $# -lt 1 ] && usage

file=$1
case "$1" in
*.[Pp][Nn][Gg])
    done=1;;
*.[Jj][Bb][Gg])
    done=1;;
*.[Jj][Ll][Ss])
    pnmcmd=djls; done=1;;
*.[Bb][Zz]2)
    pnmcmd=bzcat; done=1;;
esac
if [ -z "$done" ]; then
    ts="$(file -m $MAGIC "$1")"; t="${ts#*: }"

    case "$t" in
    GIMP\ XCF\ image\ data*)
	exec gimp "$file";;

    Netpbm\ PBM* | Netpbm\ PGM* | Netpbm\ PPM* | GIF\ image\ data* | \
	    JPEG\ image\ data* | TIFF\ image\ data*)
	;;

    IFF\ data,\ ILBM*)
	pnmcmd=ilbmtoppm;;

    PC\ bitmap\ data*)
	pnmcmd=bmptopnm;;

    Targa\ image\ data*)
	pnmcmd=tgatoppm;;

    Sun\ raster\ image\ data*)
	pnmcmd=rasttopnm;;

    Kodak\ Photo\ CD\ image\ pack\ file*)
	pnmcmd="hpcdtoppm -3";;

    JPEG\ 2000\ image\ data)
	pnmcmd=djp2;;

    JPEG\ 2000\ image\ data,\ extended\ format)
	pnmcmd=djpf;;

    *)
	case "$1" in
	*.[Pp][Cc][Xx] | *.[Pp][Cc][Cc] | *.[Xx][Bb][Mm])
	    ;;
	*.[Mm][Aa][Cc])
	    pnmcmd=macptopbm;;
	*.[Pp][Ii]1)
	    pnmcmd=/usr/local/netpbm/bin/pi1toppm;;
	*.[Pp][Ii]3)
	    pnmcmd=pi3topbm;;
	*.[Xx][Bb][Mm])
	    pnmcmd=xbmtopbm;;
	*.[Xx][Pp][Mm])
	    pnmcmd=xpmtoppm;;
	*)
	    exit 1;;
	esac;;
    esac
fi

exec 2>/dev/null

if [ -n "$slide" ]; then
    echo "$CMD: Displaying \"$1\""
    if [ -n "$pnmcmd" ]; then
    	$pnmcmd | iv >/dev/null 2>&1 &
    else
	iv "$file" >/dev/null 2>&1 &
    fi
    sleep $SLEEPTIME
    xset s reset
    sleep $SHOWTIME
    xset s activate
    kill $!
else
    if [ -n "$pnmcmd" ]; then
    	exec $pnmcmd "$file" | iv >/dev/null 2>&1
    else
	exec iv "$file" >/dev/null 2>&1
    fi
fi
.