#!/bin/sh
set -e
if [ $# -lt 3 ]; then
 echo >&2 'usage: view-cyclicly ./view-NN file-NN-a.cfm file-NN-b.cfm...'
 exit 1
fi

viewer=$1; shift

alt=".alternately"
for f in "$@"; do
	g="${g//_/__}"
	g="${g//"/"/_:}"
	alt="${alt}_,$g"
done

ln -sf -- "$1" "$alt"
"$viewer" "$alt" &

while sleep 1.0; do
	justhad="$1"; shift; set -- "$@" "$justhad"
	ln -sf -- "$1" "$alt"
done