log.go

package conch

import (
	"fmt"
	"os"
	"time"
)

type Log struct {
	Path	string
}

func (log Log)Out(format string, arg ...interface{}) {
	result := time.Now().Format("[2006-01-02 15:04:05] ")
	result += fmt.Sprintf(format + "\n", arg...)
	fmt.Print(result)
	if len(log.Path) > 0 {
		if !Exists(log.Path) {
			file, err := os.Create(log.Path)
			defer file.Close()
			if err != nil {
				fmt.Println("Create log file error.")
			}
		}
		file, err := os.OpenFile(log.Path, os.O_APPEND|os.O_WRONLY, 0666)
		defer file.Close()
		if err != nil {
			fmt.Println("Log error.")
		}
		_, _ = file.WriteString(result)
	}
}

func Exists(path string) bool {
	_, err := os.Stat(path)
	if err != nil {
		if os.IsExist(err) {
			return true
		}
		return false
	}
	return true
}