#! /bin/sh

# lndir - create shadow link tree

#

# Time stamp <89/11/28 18:56:54 gildea>

# By Stephen Gildea <gildea@bbn.com> based on

#  XConsortium: lndir.sh,v 1.1 88/10/20 17:37:16 jim Exp

#

# Used to create a copy of the a directory tree that has links for all non-

# directories (except those named RCS).  If you are building the distribution

# on more than one machine, you should use this script.

#

# If your master sources are located in /usr/local/src/X and you would like

# your link tree to be in /usr/local/src/new-X, do the following:

#

# 	%  mkdir /usr/local/src/new-X

#	%  cd /usr/local/src/new-X

# 	%  lndir ../X

#

# Note: does not link files beginning with "."  Is this a bug or a feature?

#

# Improvements over R3 version:

#   Allows the fromdir to be relative: usually you want to say "../dist"

#   The name is relative to the todir, not the current directory.

#

# Bugs in R3 version fixed:

#   Do "pwd" command *after* "cd $DIRTO".

#   Don't try to link directories, avoiding error message "<dir> exists".

#   Barf with Usage message if either DIRFROM *or* DIRTO is not a directory.

USAGE="Usage: $0 fromdir [todir]"

case $0 in 

/*) lndir=$0 ;;

*/*) lndir=`pwd`/$0 ;;

*) lndir=$0 ;;

esac

if [ $# -lt 1 -o $# -gt 2 ]

then

	echo "$USAGE"

	exit 1

fi

DIRFROM=$1

if [ $# -eq 2 ];

then

	DIRTO=$2

else

	DIRTO=.

fi

if [ ! -d $DIRTO ]

then

	echo "$0: $DIRTO is not a directory"

	echo "$USAGE"

	exit 2

fi

cd $DIRTO

if [ ! -d $DIRFROM ]

then

	echo "$0: $DIRFROM is not a directory"

	echo "$USAGE"

	exit 2

fi

pwd=`pwd`

if [ `(cd $DIRFROM; pwd)` = $pwd ]

then

	echo "$pwd: FROM and TO are identical!"

	exit 1

fi

for file in `ls -a $DIRFROM`

do

	if [ ! -d $DIRFROM/$file ]

	then

		ln -s $DIRFROM/$file .

	else

	       if [ $file != RCS -a $file != CVS -a $file != . -a $file != .. ]

		then

			echo $file:

			mkdir $file

			(cd $file

			 pwd=`pwd`

			 case "$DIRFROM" in

				 /*) ;;

				 *)  DIRFROM=../$DIRFROM ;;

			 esac

			 if [ `(cd $DIRFROM/$file; pwd)` = $pwd ]

			 then

				echo "$pwd: FROM and TO are identical!"

				exit 1

			 fi

			 $lndir $DIRFROM/$file

			)

		fi

	fi

done