#! /bin/sh
# Run `git submodule add` on submodules in `.gitmodules`
# if said `.gitmodules` has been simply copied into the project.

# Adapted from https://stackoverflow.com/a/53899440/7976758

git config -f .gitmodules --get-regexp '^submodule\..*\.path$' |
    while read -r KEY MODULE_PATH
    do
        # If the module's path exists, remove it.
        # This is done b/c the module's path is currently 
        # not a valid git repo and adding the submodule will cause an error.
        [ -d "${MODULE_PATH}" ] && rm -rf "${MODULE_PATH}"

        NAME="$(echo "${KEY}" | sed 's/^submodule\.\(.*\)\.path$/\1/')"

        url_key="$(echo "${KEY}" | sed 's/\.path$/.url/')"
        branch_key="$(echo "${KEY}" | sed 's/\.path$/.branch/')"

        URL="$(git config -f .gitmodules --get "${url_key}")"
        BRANCH="$(git config -f .gitmodules --get "${branch_key}")"

        if [ -n "$BRANCH" ]; then
           git submodule add --force -b "${BRANCH}" --name "${NAME}" "${URL}" "${MODULE_PATH}"
        else
           git submodule add --force --name "${NAME}" "${URL}" "${MODULE_PATH}"
        fi
    done

exec git submodule update --init --recursive