#! /bin/sh
# See https://stackoverflow.com/q/1260748/7976758

case "$1" in
    -c|--cached) cached=--cached; shift ;;
esac &&

if [ $# != 1 ]; then
    echo "Usage: $0 [-c|--cached] submodule_name" >&2
    exit 1
fi

cd "`git rev-parse --show-toplevel`" || exit 1
if [ \! -f .gitmodules ]; then
    echo "Cannot find .gitmodules. The command must be run " >&2
    echo "in the top-level directory of a repository with submodules" >&2
    exit 1
fi

name="$1"
path="$(git config -f .gitmodules --get "submodule.$name.path")"

if [ -z "$path" ]; then
    echo "Error: submodule $name does not exist" >&2
    exit 1
fi

git rm $cached "$path" &&
rm -rf "`git rev-parse --git-dir`"/modules/"$name" &&
git config --remove-section submodule."$name" &&

if [ \! -s .gitmodules ]; then
    git rm -f .gitmodules
fi &&

if [ -z $(ls -A "`git rev-parse --git-dir`/modules") ]; then
    exec rmdir "`git rev-parse --git-dir`/modules"
fi