Calculate the before and after size difference of an iOS App Store update.

app_store_diff.sh

#! /usr/bin/env sh
bitcode_strip="xcrun bitcode_strip"
strip="xcrun strip"
lipo="xcrun lipo"

archives=(*.xcarchive)
if [ ! ${#archives[@]} -eq 2 ] && [ ! -e "$archives[0]" ];
then
  echo "There must be two Xcode archives to calculate the before and after size of the predict.io SDK."
  exit -1
fi

working_dir=~/.predictio_calculate_sdk_size

rm -rf $working_dir &> /dev/null
mkdir $working_dir

for archive in "${archives[@]}"
do
  cp -R "$archive" $working_dir/
done

archives=("$working_dir/*.xcarchive")

declare -a app_sizes=(0,0)
archive_index=-1
for archive in ${archives[@]}
do
  ((archive_index++))

  archive_basename=`basename "$archive"`
  echo "\033[1m===> Processing '$archive_basename'\033[0m"

  frameworks=("$archive"/Products/Applications/*.app/Frameworks/*.framework)

  if [ ${#frameworks[@]} -gt 0 ] && [ -e "${frameworks[0]}" ];
  then
    echo "     ${#frameworks[*]} frameworks to strip bitcode and architectures"
    echo ""
    for framework in "${frameworks[@]}"
    do
      [ -e "$framework" ] || continue

      framework_basename=`basename "$framework"`
      binary=${framework_basename//.framework/}

      full_size=$(du -k "$framework/$binary" | cut -f1)
      echo "\033[94m\033[1m---> $framework_basename full size... $full_size KB\033[0m"

      $strip -S -T -X -x "$framework/$binary" &> /dev/null
      stripped_size=$(du -k "$framework/$binary" | cut -f1)
      echo "\033[2m     Stripping symbols... $stripped_size KB\033[0m"

      $bitcode_strip -r "$framework/$binary" -o "$framework/$binary"
      nobitcode_size=$(du -k "$framework/$binary" | cut -f1)
      echo "\033[2m     Bitcode removed... $nobitcode_size KB\033[0m"

      $lipo -thin arm64 "$framework/$binary" -o "$framework/$binary"
      thinned_size=$(du -k "$framework/$binary" | cut -f1)
      echo "\033[2m     Single architecture slice... $thinned_size KB\033[0m"

      gzip -9 < "$framework/$binary" > "$framework/$binary.gz"
      gzip_size=$(du -k "$framework/$binary.gz" | cut -f1)
      echo "     Compressed Size... $gzip_size KB"
      rm -rf "$framework/$binary.gz"
    done
  fi

  app=("$archive"/Products/Applications/*.app)
  app_name=`basename "$app"`
  app_binary=${app_name//.app/}

  echo ""
  full_size=$(du -k "$app/$app_binary" | cut -f1)
  echo "\033[94m\033[1m---> App Binary full size... $full_size KB\033[0m"

  $strip -S -T -X -x "$app/$app_binary" &> /dev/null
  stripped_size=$(du -k "$app/$app_binary" | cut -f1)
  echo "\033[2m     Stripping symbols... $stripped_size KB\033[0m"

  $bitcode_strip -r "$app/$app_binary" -o "$app/$app_binary"
  nobitcode_size=$(du -k "$app/$app_binary" | cut -f1)
  echo "\033[2m     Bitcode removed... $nobitcode_size KB\033[0m"

  $lipo -thin arm64 "$app/$app_binary" -o "$app/$app_binary"
  thinned_size=$(du -k "$app/$app_binary" | cut -f1)
  echo "\033[2m     Single architecture slice... $thinned_size KB\033[0m"

  env GZIP=-9 tar -zcf "${app}.gz" "$app" &> /dev/null
  gzip_size=$(du -k "${app}.gz" | cut -f1)
  echo "\033[1m\033[32m===> Compressed App Size... $gzip_size KB Done!\033[0m"

  app_sizes[$archive_index]=$gzip_size

  echo ""
  # echo "===> $archive_basename Done!"
  # echo ""
done

echo "\033[1m\033[32m===> App Store Download Difference"
dl_diff=$((app_sizes[0]-app_sizes[1]))
echo "     ${dl_diff/#-/} KB\033[0m"