#!/usr/bin/env bash
#
# OS X SDK packaging script
# This script must be run on OS X
#

if [ $(uname -s) != "Darwin" ]; then
  echo "This script must be run on OS X"
  exit 1
fi

XCODEDIR=$(ls /Volumes | grep Xcode | head -n1)

if [ -z "$XCODEDIR" ]; then
  if [ -d "/Applications/Xcode.app" ]; then
    XCODEDIR="/Applications/Xcode.app"
  else
    echo "please mount Xcode.dmg"
    exit 1
  fi
else
  XCODEDIR="/Volumes/$XCODEDIR/Xcode.app"
fi

[ ! -d $XCODEDIR ] && exit 1
echo -e "found Xcode: $XCODEDIR"

WDIR=$(pwd)

which gnutar &>/dev/null

if [ $? -eq 0 ]; then
  TAR=gnutar
else
  TAR=tar
fi

which xz &>/dev/null

if [ $? -eq 0 ]; then
  COMPRESSOR=xz
  PKGEXT="tar.xz"
else
  COMPRESSOR=bzip2
  PKGEXT="tar.bz2"
fi

set -e

pushd $XCODEDIR &>/dev/null
pushd "Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs" &>/dev/null || {
  echo "Xcode (or this script) is out of date"
  echo "trying some magic to find the SDKs anyway ..."

  SDKDIR=$(find . -name SDKs -type d | grep MacOSX | head -n1)

  if [ -z "$SDKDIR" ]; then
    echo "cannot find SDKs!"
    exit 1
  fi

  pushd $SDKDIR &>/dev/null
}

SDKS=$(ls | grep MacOSX)

if [ -z "$SDKS" ]; then
    echo "No SDK found"
    exit 1
fi

LIBCXXDIR="Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1"

for SDK in $SDKS; do
  echo "packaging ${SDK/.sdk/} SDK (this may take several minutes) ..."

  if [[ $SDK == *.pkg ]]; then
    cp $SDK $WDIR
    continue
  fi

  TMP=$(mktemp -d /tmp/XXXXXXXXXXX)
  cp -r $SDK $TMP &>/dev/null || true

  pushd $XCODEDIR &>/dev/null

  # libc++ headers for C++11/C++14
  if [ -d $LIBCXXDIR ]; then
    cp -rf $LIBCXXDIR "$TMP/$SDK/usr/include/c++"
  fi

  popd &>/dev/null

  pushd $TMP &>/dev/null
  $TAR -cf - * | $COMPRESSOR -9 -c - > "$WDIR/$SDK.$PKGEXT"
  popd &>/dev/null

  rm -rf $TMP
done

popd &>/dev/null
popd &>/dev/null

echo ""
ls -l | grep MacOSX