package FileUtil

import (
	"bufio"
	"fmt"
	"io"
	"os"
)

// 判断所给路径文件/文件夹是否存在
func Exists(path string) bool {
	_, err := os.Stat(path)    //os.Stat获取文件信息
	if err != nil {
		if os.IsExist(err) {
			return true
		}
		return false
	}
	return true
}
/**
功能：按行读取文件
作者：黄海
时间：2020-07-08
 */
func ReadLines(path string) ([]string, error) {
	file, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	var lines []string
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		lines = append(lines, scanner.Text())
	}
	return lines, scanner.Err()
}

/**
功能：按行写入文件
作者：黄海
时间：2020-07-08
*/
func WriteLines(lines []string, path string) error {
	file, err := os.Create(path)
	if err != nil {
		return err
	}
	defer file.Close()

	w := bufio.NewWriter(file)
	for _, line := range lines {
		fmt.Fprintln(w, line)
	}
	return w.Flush()
}



func CopyFile (dstFilePath string,srcFilePath string)(written int64, err error){
	srcFile,err := os.Open(srcFilePath)
	if err != nil{
		fmt.Printf("打开源文件错误，错误信息=%v\n",err)
	}
	defer srcFile.Close()
	reader := bufio.NewReader(srcFile)

	dstFile,err := os.OpenFile(dstFilePath,os.O_WRONLY | os.O_CREATE,0777)
	if err != nil{
		fmt.Printf("打开目标文件错误，错误信息=%v\n",err)
		return
	}
	writer := bufio.NewWriter(dstFile)
	defer dstFile.Close()
	return io.Copy(writer,reader)
}