#!/bin/sh

set -eu

# Set up shared variables.
GIT_REPO="$1"
GIT_BRANCH="$2"

# Ensure correct usage and state.
if test -z "$GIT_REPO"; then
    echo "Git repository path is empty, please provide a valid path as the first argument."
    exit 1
elif test -z "$GIT_BRANCH"; then
    echo "Git branch name is empty, please provide a valid branch name as the second argument."
    exit 1
elif test ! -e "/src/${GIT_REPO}/refs/heads/${GIT_BRANCH}"; then
    echo "Unable to find HEAD reference for '${GIT_REPO}', branch '${GIT_BRANCH}', is this a valid Git repository?"
    exit 2
fi

chown -R hugo:hugo /dest
gosu hugo git clone --quiet --shared --branch "${GIT_BRANCH}" "/src/${GIT_REPO}" /tmp/src

# Wait for updates to watched branch for the given site, and build static content anew.
(
    cd /tmp/src
    while inotifywait -qq --event modify "/src/${GIT_REPO}/refs/heads/${GIT_BRANCH}"; do
        gosu hugo git fetch origin "${GIT_BRANCH}" && gosu hugo git reset --hard "${GIT_BRANCH}"
    done
) &

gosu hugo hugo watch --verbose --source /tmp/src --destination /dest