#!/usr/bin/env bash

# This script does not need to be run in a general
# workflow. I just ran it once upon some brew libs
# that I'd copied into lib_relinked.
#
# As a result: lib_relinked now contains _relinked_
# binaries, whose install names are relative to @rpath
# (instead of an absolute path provided by brew).
#
# Thus, libraries in lib_relinked are portable, and
# and executable which sets rpath correctly can
# discover them.

# Ascertain directory in which script lives; compatible with all UNIX
# Thanks to kenorb
# http://stackoverflow.com/a/17744637/5257399
MYDIR=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
set -o pipefail

error() {
  local parent_lineno="$1"
  local message="$2"
  local code="${3:-1}"
  if [[ -n "$message" ]] ; then
    echo "Error on or near line ${parent_lineno}: ${message}; exiting with status ${code}"
  else
    echo "Error on or near line ${parent_lineno}; exiting with status ${code}"
  fi
  exit "${code}"
}
trap 'error ${LINENO}' ERR

####

FLUIDSYNTH="libfluidsynth.1.7.2.dylib"
FLUIDSYNTHNOVER="libfluidsynth.dylib"
GLIB="libglib-2.0.0.dylib"
GTHREAD="libgthread-2.0.0.dylib"
INTL="libintl.8.dylib"
PCRE="libpcre.1.dylib"

# all of the following are just for SF3 support...
SNDFILE="libsndfile.1.dylib"
FLAC="libFLAC.8.dylib"
OGG="libogg.0.dylib"
VORBIS="libvorbis.0.dylib"
VORBISENC="libvorbisenc.2.dylib"

IDPREFIX="@rpath"
FRAMEWORKLOAD="$IDPREFIX"

FRAMEWORKS="$MYDIR/lib_relinked"

cp "$MYDIR/lib"/*.dylib "$FRAMEWORKS/"

# we're gonna relink these frameworks also, so make them writeable
chmod +w "$FRAMEWORKS/"*.dylib

# changes to our libfluidsynth (depends on glib, gthread, intl):
# change our x.1.7.2.dylib to identify itself as x.dylib, to meet our targets' expectations
install_name_tool -id "$IDPREFIX/$FLUIDSYNTHNOVER" "$FRAMEWORKS/$FLUIDSYNTH"
install_name_tool -change /usr/local/opt/libsndfile/lib/libsndfile.1.dylib "$FRAMEWORKLOAD/$SNDFILE" "$FRAMEWORKS/$FLUIDSYNTH"
install_name_tool -change /usr/local/opt/glib/lib/libglib-2.0.0.dylib "$FRAMEWORKLOAD/$GLIB" "$FRAMEWORKS/$FLUIDSYNTH"
install_name_tool -change /usr/local/opt/glib/lib/libgthread-2.0.0.dylib "$FRAMEWORKLOAD/$GTHREAD" "$FRAMEWORKS/$FLUIDSYNTH"
install_name_tool -change /usr/local/opt/gettext/lib/libintl.8.dylib "$FRAMEWORKLOAD/$INTL" "$FRAMEWORKS/$FLUIDSYNTH"

# our linker option -lfluidsynth expects a dylib to exist with no version number in its filename
[ ! -L "$FRAMEWORKS/$FLUIDSYNTHNOVER" ] && ln -s "$FLUIDSYNTH" "$FRAMEWORKS/$FLUIDSYNTHNOVER"

# changes to our glib (depends on pcre, intl):
install_name_tool -id "$IDPREFIX/$GLIB" "$FRAMEWORKS/$GLIB"
install_name_tool -change /usr/local/opt/pcre/lib/libpcre.1.dylib "$FRAMEWORKLOAD/$PCRE" "$FRAMEWORKS/$GLIB"
install_name_tool -change /usr/local/opt/gettext/lib/libintl.8.dylib "$FRAMEWORKLOAD/$INTL" "$FRAMEWORKS/$GLIB"

# changes to our gthread (depends on pcre, intl, glib):
# yes, the brew-installed libgthread links directly to brew-installed libglib (unlike fluidsynth, which points at a _symlink_ to the same)
install_name_tool -id "$IDPREFIX/$GTHREAD" "$FRAMEWORKS/$GTHREAD"
install_name_tool -change /usr/local/opt/pcre/lib/libpcre.1.dylib "$FRAMEWORKLOAD/$PCRE" "$FRAMEWORKS/$GTHREAD"
install_name_tool -change /usr/local/opt/gettext/lib/libintl.8.dylib "$FRAMEWORKLOAD/$INTL" "$FRAMEWORKS/$GTHREAD"
install_name_tool -change /usr/local/Cellar/glib/2.56.1/lib/libglib-2.0.0.dylib "$FRAMEWORKLOAD/$GLIB" "$FRAMEWORKS/$GTHREAD"

# changes to our intl:
install_name_tool -id "$IDPREFIX/$INTL" "$FRAMEWORKS/$INTL"

# changes to our pcre:
install_name_tool -id "$IDPREFIX/$PCRE" "$FRAMEWORKS/$PCRE"

# the following are just for SF3 support...
# changes to our libsndfile (depends on FLAC, ogg, vorbis, vorbisenc):
install_name_tool -id "$IDPREFIX/$SNDFILE" "$FRAMEWORKS/$SNDFILE"
install_name_tool -change /usr/local/opt/flac/lib/libFLAC.8.dylib "$FRAMEWORKLOAD/$FLAC" "$FRAMEWORKS/$SNDFILE"
install_name_tool -change /usr/local/opt/libogg/lib/libogg.0.dylib "$FRAMEWORKLOAD/$OGG" "$FRAMEWORKS/$SNDFILE"
install_name_tool -change /usr/local/opt/libvorbis/lib/libvorbis.0.dylib "$FRAMEWORKLOAD/$VORBIS" "$FRAMEWORKS/$SNDFILE"
install_name_tool -change /usr/local/opt/libvorbis/lib/libvorbisenc.2.dylib "$FRAMEWORKLOAD/$VORBISENC" "$FRAMEWORKS/$SNDFILE"

# changes to our FLAC:
install_name_tool -id "$IDPREFIX/$FLAC" "$FRAMEWORKS/$FLAC"

# changes to our ogg:
install_name_tool -id "$IDPREFIX/$OGG" "$FRAMEWORKS/$OGG"

# changes to our vorbis (depends on ogg):
install_name_tool -id "$IDPREFIX/$VORBIS" "$FRAMEWORKS/$VORBIS"
install_name_tool -change /usr/local/opt/libogg/lib/libogg.0.dylib "$FRAMEWORKLOAD/$OGG" "$FRAMEWORKS/$VORBIS"

# changes to our vorbisenc (depends on vorbis, ogg):
install_name_tool -id "$IDPREFIX/$VORBISENC" "$FRAMEWORKS/$VORBISENC"
install_name_tool -change /usr/local/Cellar/libvorbis/1.3.6/lib/libvorbis.0.dylib "$FRAMEWORKLOAD/$VORBIS" "$FRAMEWORKS/$VORBISENC"
install_name_tool -change /usr/local/opt/libogg/lib/libogg.0.dylib "$FRAMEWORKLOAD/$OGG" "$FRAMEWORKS/$VORBISENC"