#!/bin/bash
# freplace.sh v1.1 <17.12.2006>
# (cc) 2006 Filipp Lepalaan <filipp@mac.com>

usage="`basename $0` [-sb] [-o owner:group] -d indir target replacement"

# Set up defaults
do_chown='no'
do_backup='no'
do_symlink='no'
do_replace='yes'

if [ $# -lt 2 ]
	then echo "Usage: $usage"
	exit 1
fi

# Parse the args
while getopts "rsbo:d:" param
do
	case $param in
		s ) do_symlink='yes';;
		b ) do_backup='yes';;
		o ) do_chown='yes';o_user=${OPTARG%:*};o_group=${OPTARG#*:};;
		d ) srch_dir=$OPTARG;;
	esac
done

# Need the last two args
shift $(($# - 2))
target=$1
replacement=$2

# Sanity check
if ! [ -a "$replacement" ]
	then echo "Error: \"$replacement\" not found"
	exit 1
fi

# Just a little timesaver. Too bad Bash won't do this.
function realpath {
	echo `/usr/bin/php -r "echo realpath ('$1');"`
	exit 0
}

IFS=$'\n';	# So that names with spaces would't bother us

for i in `find $srch_dir -name $target`
do
	replacement=`realpath $replacement`	# Create absolute path
	
	echo "*** Replacing \"`realpath $i`\" with \"$replacement\""
	
	if [ $do_backup = "yes" ]
		then mv $i "$i.old"
	fi
	
	if [ $do_symlink = "yes" ]
		then rm -rf $i
		ln -fs $replacement $i
		do_replace='no'					# If we link, we don't copy
	fi
	
	if [ $do_replace = 'yes' ]
		then cp -rf $replacement $i
	fi
	
	if [ $do_chown = 'yes' ]
		then chown $o_user:$o_group $i
	fi
done

exit 0