#! /bin/bash
#
# mkclone - symlink every file appearing in $src/MANIFEST to a corresponding
#	    file in the target directory ($1).  Directories specified in
#	    MANIFEST are created in the target directory
#
prog=`basename $0`

SRCDIR=src

USAGE="usage: $prog [-m manifest] [-s srcdir] [-v] [-d] [-h] target"
while getopts dhm:s:v opt
do
	case "$opt" in
	m)	MANIFEST=$OPTARG ;;
	s)	SRCDIR=$OPTARG ;;
	v)	verbose=y ;;
	d)	ECHO=echo debug=y ;;
	h)	hardlinks=y ;;
	?)	echo $USAGE >&2
		exit 2;;
	esac
done

: ${MANIFEST:=${SRCDIR}/MANIFEST}

[ -n "$debug" ] && verbose=

shift $(( $OPTIND - 1 ))

if [ $# -lt 1 ]; then
	echo $USAGE >&2
        exit 2
fi

if [ ! -f $MANIFEST ]; then
	echo "$prog: $MANIFEST: no such file or directory" >&2
	echo "$prog: must be run with valid -s argument or from source directory" >&2
	exit 1
fi

rm -f /tmp/z
# if the user specified hard links, then do that.  otherwise, try to use
# symlinks if they're present
if [ -n "$hardlinks" ]; then
        LN=ln
elif (ln -s /dev/null /tmp/z) >/dev/null 2>&1; then
        LN="ln -s"
else
        LN=ln
fi
rm -f /tmp/z

TARGET=$1

if [ ! -d "$TARGET" ]; then
	mkdir "$TARGET"
fi

echo "${prog}: creating clone of bash source tree (from $SRCDIR) in $TARGET"

cd "$TARGET" || { echo "${prog}: cannot cd to $TARGET" >&2 ; exit 1; }

while read fname type mode
do
	[ -z "$fname" ] && continue

	case "$fname" in
	\#*)	continue ;;
	esac

	case "$type" in
	d)	[ -n "$verbose" ] && echo mkdir $fname
		$ECHO mkdir $fname ;;		# already in $TARGET
	f)	fn=${fname##*/}
		case "$fname" in
		*/*)	dn=${fname%/*} ;;
		*)	dn=. ;;
		esac
		if [ -n "$verbose" ] || [ -n "$debug" ]; then
			echo "( cd $dn && $LN $SRCDIR/$fname $fn )"
		fi
		[ -z "$debug" ] && ( cd $dn && $LN $SRCDIR/$fname $fn )
		;;
	*)	echo "${prog}: ${fname}: unknown file type $type" 1>&2 ;;
	esac
done < $MANIFEST

# special
SPECIAL="parser-built y.tab.c y.tab.h"

rm -f $SPECIAL
for sf in $SPECIAL
do
	[ -n "$verbose" ] && echo cp -p $SRCDIR/$sf $TARGET
	$ECHO cp -p $SRCDIR/$sf $TARGET
done

$ECHO $LN $SRCDIR/.distribution .
$ECHO $LN $SRCDIR/.patchlevel .

exit 0