package log

import (
	"fmt"
	"os"
	"path/filepath"
)

// getExeFilename
func getExeFilename() string {
	_, logfilename := filepath.Split(os.Args[0])
	if logfilename == "" {
		panic("get exe filename failed")
	}
	return logfilename
}

// tryOptLogDirs
func tryOptLogDirs(optLogDirs []string) (string, error) {
	optionDirsStr := ""
	for i, d := range optLogDirs {
		dir := fmt.Sprintf("%s/", d)
		optionDirsStr += fmt.Sprintf("%d.[%s];", i, dir)
		if _, err := os.Stat(dir); err == nil {
			return dir, nil
		}
	}
	return "", fmt.Errorf("all optional dir are not exist: %s", optionDirsStr)
}