#!/bin/sh

# 
# Copyright (c) 1999 Ethan Fischer
#

# some useful variables
nl="
"
q='"'
sednl="\\
"
name=`echo "$0" | sed "s@/@$sednl@g" | tail -1`

# set input field separator
old_ifs="$IFS"
IFS=$nl

# set defaults
option_delay="10"
option_types='*.gif,*.jpg,*.xpm'
find_args=""
find_args2=""

# parse options
while test -n "$1"; do
	case "$1" in
		-d|--delay)
			shift
			option_delay="$1"
			;;
		-e|--repeat)
			option_repeat=1
			;;
		-f|--file)
			shift
			option_file="$1"
			;;
		-h|--help)
			option_help=1
			;;
		-n|--new-term)
			option_new_term=1
			;;
		-r|--recurse)
			option_recurse=1
			;;
		-R|--random)
			option_random=1
			;;
		-s|--shade)
			shift
			option_shade="$1"
			;;
		-t|--term)
			option_term=1
			;;
		-v|--version)
			option_version=1
			;;
		-T|--types)
			shift
			option_types="$1"
			;;
		--)
			shift
			break
			;;
		-*)
			echo "Unknown option: $1"
			exit 1
			;;
		*)
			break
			;;
	esac
	shift
done

# display version info
if test -n "$option_version"; then
	echo "$name version 1.0"
	exit 0
fi

# display help
if test -n "$option_help"; then
	echo "Usage:"
	echo "$name [-d] [-e] [-f file] [-h] [-n term] [-r] [-R] [-s %] [-t]"
	printf "%*s [-T type1,[type2,[...]]] [-v] dirs\\n" ${#name} ""
	echo "-d (--delay) n     set delay between frames to n seconds (default 10)"
	echo "-e (--repeat)      repeatedly display list, re-randomizing if --random"
	echo "-f (--file) f      read image names from file f"
	echo "-h (--help)        this help"
	echo "-n (--new-term)    open new aterm, then same as --term"
	echo "-r (--recurse)     recursive search"
	echo "-R (--random)      randomize image list"
	echo "-s (--shade) %     shading option to be passed to aterm (only valid with -n)"
	echo "-t (--term)        display image in xterm background"
	echo "-T (--types) types types of files to display; types is a comma-separated"
	echo '                   list (default is "*.gif,*.jpg,*.xpm")'
	echo "-v (--version)     display version information"
	echo "dirs               directories (or files) to search"
	exit 0
fi

# need at least one dir
if test -z "$*" && test -z "$option_file"; then
	echo "$name: at least one file or directory is required"
	exit 1
fi

# follow symlinks
find_args="-follow"

# set recursion
if test -z $option_recurse; then
	find_args="$find_args${nl}-maxdepth${nl}1"
fi

# set input file
if test -n "$option_file"; then
	opts=`cat $option_file`
else
  tmp="-name${nl}"`echo $option_types | sed -e "s/,/ -o -name /g" -e "s/ /$sednl/g"`
	opts=`find "$@" $find_args $tmp | sort | uniq`
fi

# randomize the list
if test -n "$option_random"; then
	opts=`echo "$opts" | randomize`
fi

if test -n "$option_new_term"; then
	echo "$opts" > /tmp/slideshow.txt
	command="slideshow -t -f /tmp/slideshow.txt"
	if test -n "$option_delay"; then command="$command -d $option_delay"; fi
	if test -n "$option_repeat"; then command="$command -e"; fi
	if test -n "$option_recurse"; then command="$command -r"; fi
	if test -n "$option_random"; then command="$command -R"; fi
	if test -n "$option_types"; then command="$command -T $option_types"; fi
	if test -n "$option_shade"; then
		aterm -sh "$option_shade" +sb -e sh -c "($command &);exec $SHELL"
	else
		aterm +sb -e sh -c "($command &);exec $SHELL"
	fi
elif test -n "$option_term"; then
	cont=1
	while test "$cont" = "1"; do
		for i in $opts; do
			echo -n "]20;$i"
		  sleep $option_delay
		done
		cont=$option_repeat
	done
else
	cont=1
	while test "$cont" = "1"; do
		for i in $opts; do
			ascommand.pl "Background "'""'" $i"
		  sleep $option_delay
		done
		cont=$option_repeat
	done
fi