ma_plan_view_feh

#!/bin/sh -e
# Ma_Sys.ma Plan View Feh 1.0.0.2, Copyright (c) 2015 Ma_Sys.ma.
# For further info send an e-mail to Ma_Sys.ma@web.de.

mpvf_main() {
	if [ $# = 0 ]; then
		mpvf_invoc .
	elif [ "$1" = "-s" ]; then
		shift
		mpvf_special "$@"
	elif [ "$1" = "--help" -o "$1" = "-h" -o "$1" = "-?" -o "$1" = "help" ];
									then
		mpvf_help
	elif [ $# = 1 -a -f "$1" ]; then
		dn="$(dirname "$1")"
		mpvf_invoc --start-at "$dn/$(basename "$1")" "$dn"/*
	else
		mpvf_invoc "$@"
	fi
	return $?
}

mpvf_invoc() {
	# exec is crucial for keeping the same pid!
	exec /usr/bin/feh --action1 "; $0 -s store %F" \
		--action2 "; $0 -s go $$ %F" -. -S filename "$@"
}

# -s store PATH
# -s go PID PATH
mpvf_special() {
	if [ "$1" = store ]; then
		mpvf_store "$2"
	elif [ "$1" = go ]; then
		mpvf_go "$2" "$3"
	else
		echo "ERROR: Need to give store|go."
		echo "Program bug or malformed invocation."
		return 1
	fi
}

# $1 FILE
mpvf_store() {
	echo "$1" >> planview_sel.txt
}

# PID PATH
mpvf_go() {
	sel="$(zenity --file-selection --title="Directory selection" \
						--filename="$2" --directory)"
	if [ -n "$sel" -a -d "$sel" ]; then
		mpvf_replace "$1" "$sel"
	fi
}

# PID PATH
mpvf_replace() {
	kill -s TERM "$1" || echo WARNING: Failed to terminate old process
	mpvf_invoc "$2"/*
}

mpvf_main "$@"