#! /usr/bin/ksh
##########################################################################
# Title      :	update.ksh - update files based on the modification time
# Author     :	Heiner Steven <heiner.steven@odn.de>
# Category   :	File Utilities
# Requires   :	cp, cpio, find, ksh
# Date       :	1996-05-24
# SCCS-Id.   :	@(#) update.ksh	1.4 03/12/19
##########################################################################
# Description
#
##########################################################################

PN=${0##*/}			# Program name
VER='1.4'

CpioFlags=dm
CpFlags=p

function usage
{
    print -u2 "$PN - update files based on the modification time $VER (hs '96)
usage: $PN [-v] file [file ...] directory
       $PN [-v] file file
       $PN [-vr] {file|directory} [...] directory"
    exit 1
}

function fatal { print -u2 "$PN:" "$@"; exit 1; }
function msg { [[ $Verbose == yes ]] && print -u2 -- "$@"; }

set -u	# DEBUG

Recurse=no
Verbose=no
MultipleFiles=no
while getopts :vrRh Opt
do
    case "$Opt" in
	(v)	CpioFlags="${CpioFlags}v" Verbose=yes;;
	([rR])	Recurse=yes;;
	(h)	usage;;
	(*)	usage;;
    esac
done
shift OPTIND-1

(( $# < 2 )) && usage
(( $# > 3 )) && MultipleFiles=yes

eval Dst="\${$#}"

if [[ -d $Dst ]]
then				# Copy files to a directory
    if [[ $Recurse == no ]]
    then
	Files=$(
	    for Path
	    do
		[[ $Path == $Dst ]] && continue
		New="$Dst/${Path##*/}"
		if [[ ! -a $New || $Path -nt $New ]]
		then
		    echo "$Path"
		    msg "$New"
		else
		    msg "Existing \"$New\" is same age or newer"
		fi
	    done)
	[[ -n $Files ]] && cp -$CpFlags $Files "$Dst"
    else
	for Path
	do
	    [[ $Path == $Dst ]] && continue
	    find "$Path" -print | {
		[[ $Verbose == no ]] && exec >/dev/null 2>&1
		cpio -p$CpioFlags "$Dst"
	    }
	done
    fi
elif [[ $MultipleFiles == yes ]]
then
    fatal "cannot copy multiple files to file $Dst"
elif [[ -f $1 ]]
then
    if [[ ! -a $Dst || $1 -nt $Dst ]]
    then
	msg "$Dst"
	cp -p "$1" "$Dst"
    else
	msg "Existing \"$Dst\" is same age or newer"
    fi
else			# $1 is no file or non-existing
    fatal "cannot copy $1 to file $Dst"
fi