/*
 * Copyright © 2021 peizhaoyou <peizhaoyou@4paradigm.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package main

import (
	"os"
	"os/signal"

	"github.com/fsnotify/fsnotify"
)

func newFSWatcher(files ...string) (*fsnotify.Watcher, error) {
	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		return nil, err
	}

	for _, f := range files {
		err = watcher.Add(f)
		if err != nil {
			watcher.Close()
			return nil, err
		}
	}

	return watcher, nil
}

func newOSWatcher(sigs ...os.Signal) chan os.Signal {
	sigChan := make(chan os.Signal, 1)
	signal.Notify(sigChan, sigs...)

	return sigChan
}
