#!/usr/bin/env bash

ls-git-folder() {
    if [[ -z "$1" ]]; then
        echo '$1/filter is empty.' >&2
        return 1
    fi

    if [[ ! -f ".gitmodules" ]]; then
        echo "Error: '.gitmodules' not found in current directory." >&2
        return 1
    fi

    # Get submodule paths that start with filter, output space-separated
    git config --file .gitmodules --get-regexp '^submodule\..*\.path$' 2>/dev/null \
        | cut -d' ' -f2 \
        | grep "^$1" \
        | tr '\n' ' ' \
        | sed 's/ $//'
}