#!/bin/bash

lock_file=/tmp/watch-calendars.lock

if [ $# -eq 0 ]; then
  if [ -r "${lock_file}" ] \
  && kill -0 "$(cat "${lock_file}")"; then
    exit
  fi

  echo $$ >"${lock_file}"
  trap 'rm "${lock_file:?}"' EXIT

  find ~/.local/share/khal/calendars \
    -mindepth 1 \
    -maxdepth 1 \
    -type d \
  | parallel -j0 "$0"
  exit $?
fi

while [ -d "$1" ]; do
  inotifywait -r "$1" -e CREATE,MOVED_TO,DELETE -t 30
  git -C "$1" add -A
  git -C "$1" commit -m'update by '"$(whoami)"'@'"$(uname -n)"' on '"$(date)"
  git -C "$1" pull --rebase
  git -C "$1" push
done