dlxcode.sh

CURL_REQUEST_CMD=...;
XCODE_DL_LOCATION="/Volumes/Card512";
XCODE_TMP_EXTRACT_LOCATION="/Volumes/Card512/xcode";
XCODE_FINAL_EXTRACT_LOCATION="/Volumes/Card512"

# download xcode
cd "${XCODE_DL_LOCATION}" || \
    { echo "cd ${XCODE_DL_LOCATION} failed"; exit 1; }

while ! ${CURL_REQUEST_CMD} -o xcode.xip --continue -; do
    echo "continue download";
done

# raw extract xpi (cannot use `xip --expand` because xip cannot filter extraction)
tar -zxvf xcode.xip -C "${XCODE_TMP_EXTRACT_LOCATION}";

# extract xcode.app
cd "${XCODE_FINAL_EXTRACT_LOCATION}" \
    || { echo "cd ${XCODE_FINAL_EXTRACT_LOCATION} failed"; exit 1; }

# if pbzx not installed, get it here
#     https://github.com/NiklasRosenstein/pbzx.git
#     brew install xz
#     clang -I /usr/local/include pbzx.c -o pbzx -llzma -lxar

# skipping extracting CoreSimulator, which will take about > 70GB of space
pbzx -n "${XCODE_TMP_EXTRACT_LOCATION}/Content" | cpio -i -v -f '*CoreSimulator*'

# Setting the new xcode
# sudo xcode-select --switch ${XCODE_FINAL_EXTRACT_LOCATION}/Xcode.app
# sudo xcode-select --install