#!/bin/bash

set -e

#set -x

[ -z "$2" ] && echo "usage: \"$0\" <file> <source-prefix> <destination-dir>" && echo "This utility relocates binary <file> from <source-prefix> to <destonation-dir> together with all dependencies and adds rpath support." && exit 1</destonation-dir></source-prefix></file></destination-dir></source-prefix></file>

readlink_f() {

	TARGET_FILE=$1

	cd `dirname $TARGET_FILE`

	TARGET_FILE=`basename $TARGET_FILE`

	# Iterate down a (possible) chain of symlinks

	while [ -L "$TARGET_FILE" ]

	do

		TARGET_FILE=`readlink $TARGET_FILE`

		cd `dirname $TARGET_FILE`

		TARGET_FILE=`basename $TARGET_FILE`

	done

	# Compute the canonicalized name by finding the physical path 

	# for the directory we're in and appending the target file.

	PHYS_DIR=`pwd -P`

	RESULT=$PHYS_DIR/$TARGET_FILE

	echo $RESULT

}

remove_prefix() {

	local INPUT="$1"

	local OUTPUT=""

	if [[ "$INPUT" == /usr/local/Cellar/* ]]; then

		TMP="${INPUT#*/}" # usr/local/Cellar/pkgname/pkgversion/path

		TMP="${TMP#*/}"  # local/Cellar/pkgname/pkgversion/path

		TMP="${TMP#*/}"  # Cellar/pkgname/pkgversion/path

		TMP="${TMP#*/}"  # pkgname/pkgversion/path

		TMP="${TMP#*/}"  # pkgversion/path

		TMP="${TMP#*/}"  # path

		OUTPUT="${TMP}"

	elif [[ "$INPUT" == /usr/local/opt/* ]]; then

		TMP="${INPUT#*/}" # usr/local/opt/pkgname/path

		TMP="${TMP#*/}"  # local/opt/pkgname/path

		TMP="${TMP#*/}"  # opt/pkgname/path

		TMP="${TMP#*/}"  # pkgname/path

		TMP="${TMP#*/}"  # path

		OUTPUT="${TMP}"

	elif [[ "$INPUT" == /usr/local/lib/* ]]; then

		TMP="${INPUT#*/}" # usr/local/lib/file

		TMP="${TMP#*/}"  # local/lib/file

		TMP="${TMP#*/}"  # lib/file = path

		OUTPUT="${TMP}"

	elif [[ "$INPUT" == /usr/local/share/* ]]; then

		TMP="${INPUT#*/}" # usr/local/share/file

		TMP="${TMP#*/}"  # local/share/file

		TMP="${TMP#*/}"  # share/file = path

		OUTPUT="${TMP}"

	elif [[ "$INPUT" == $PREFIX* ]]; then

		#LINE2=`echo "${INPUT}" | cut -c1-$PREFIXLEN`

		OUTPUT="${INPUT:$PREFIXLEN}"

	fi

	echo "$OUTPUT"

}

process_lib() {

local FILESRC="$1"

local FILEDEST_SHORT="$2"

#local FILE_PARENT="$2"

	local FILEDEST="${DEST}/${FILEDEST_SHORT}"

	if [ ! -f "${FILEDEST}" ]; then

		if [ ! -d `dirname "${FILEDEST}"` ]; then

			mkdir -p `dirname "${FILEDEST}"`

		fi

		REALPATH=`readlink_f "${FILESRC}"`

		cp "${REALPATH}" "${FILEDEST}"

		chmod a+rw "$FILEDEST"

		install_name_tool -add_rpath ./ "$FILEDEST" > /dev/null 2>&1 || true

		echo "Relinking ${FILEDEST_SHORT} ..."

		local FIRST=true

		local LINE=

		local LINE2=

		otool -L "${FILEDEST}" | while read -r LINE; do

			#echo "$LINE"

			if $FIRST; then

				FIRST=false

			else

				LINE=`echo "$LINE" | sed -e 's/^[ \t]*//' | sed -e 's/ \(.*\)$//'`

				# make sure file isn't referencing itself

				#A=$(basename "$FILEDEST")

				#B=$(basename "$LINE")

				if [ ! "$LINE" == "$FILESRC" ]; then

					LINE2=`remove_prefix "$LINE"`

					if [ ! -z "$LINE2" ]; then

					#if [ ! -z "$FILE_PARENT" ]; then

						#echo "   install_name_tool -change \"$LINE\" \"@rpath/$LINE2\" \"$FILEDEST\""

						install_name_tool -change "$LINE" "@rpath/$LINE2" "$FILEDEST"

						process_lib "$LINE" "$LINE2"

					#fi

					fi

				fi

			fi

    	done

		#echo "... finished ${FILEDEST_SHORT}"

	fi

}

#scan "$BASE_FILE"

#scan "$BASE_FILE" subscan

#TARGET_FILE=`readlink_f "$1"`

TARGET_FILE="$1"

echo "Gathering deps for: $TARGET_FILE"

export DEST="$3"

#echo "DESTINATION: $DEST"

export PREFIX="$2"

export PREFIXLEN=${#PREFIX}

if [ ! -f "${TARGET_FILE}" ]; then

	echo "ERROR: File not found."

	exit 1

fi

FILEDEST_SHORT=`remove_prefix "${TARGET_FILE}"`

if [[ "${TARGET_FILE}" == ${PREFIX}* ]]; then

	process_lib "${TARGET_FILE}" "${FILEDEST_SHORT}"

fi

echo "Success."

echo ""