#!/usr/bin/env bash

set -o nounset

submodule_count=$(git diff --staged --submodule=log | grep -c '^Submodule')

if (( $submodule_count == 1 )) ; then
    msg="Update submodule $(git diff --staged --submodule=log | grep '^Submodule' | cut -d ' ' -f 2)"
else
    msg="Update submodules"
fi

git commit --edit --no-status \
    --message="$msg" \
    --message "$(git diff --staged --color=never --submodule=log | sed 's/^S/\nS/' | sed 's/^Submodule /* /' | sed 's/  >/  */')"