#! /bin/bash
#
#<ABS># Find files in dir1 which are newer than files in dir2
#
#<DSC># This shell script returns a list of files which are either
# newer than their counterparts in dir2 or do not exist there. If
# invoked with the switch -v the output lines are prefixed with "C"
# for files which are existant but older in dir2 then in dir1 and "N"
# for files non-existant in dir2.
# If dir2 is not specified it defaults to the current directory.
#
#<CPY># GPL 2007 Manfred Waßmann http://www.berlinos.de/
#<END>#
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License version 2,
#  as published by the Free Software Foundation.
#
# new,v 1.2 2007-09-25 19:40:27 manolo Exp
#

usage ()
{
	local rc="${1:-0}"

	echo "usage: ${0##*/} [-vD] [--] DIR1 [DIR2]"
	exit $rc
}


newer ()
{
	local path1="$1" path2="$2"

	if [ -d "$path1" ]; then
		for file in "$path1"/*; do
			test -e "$file" || continue
			newer "${path1}/${file##*/}" "${path2}/${file##*/}"
		done
	elif [ -e "$path1" ]; then
		if [ "$VERBOSE" ]; then
			if [ ! -e "$path2" ]; then
				printf '%s %s\n' N "$path1"
			elif [ "$path1" -nt "$path2" ]; then
				printf '%s %s\n' C "$path1"
			fi
		elif [ ! -e "$path2" -o "$path1" -nt "$path2" ]; then
			echo "$path1"
		fi
	fi
}

unset VERBOSE
while getopts :vD OPT; do
	case $OPT in
		h)
			usage
			;;
		v)
			VERBOSE=-v
			;;
		D)
			set -x
			;;
		*)
			usage 2
	esac
done
shift $[ OPTIND - 1 ]

if [ $# -eq 1 ]; then
	newer "$1" .
elif [ $# -ne 2 ]; then
		usage 2
else
	newer "${@%%/}"
fi