my goto file open in go

file_open.go

import (
	"github.com/Laughs-In-Flowers/xrr"
)

func openFile(path string) (*os.File, error) {
	p := filepath.Clean(path)

	dir, name := filepath.Split(p)

	var fp string
	var aErr error
	switch dir {
	case "":
		fp, aErr = filepath.Abs(name)
	default:
		exist(dir)
		fp, aErr = filepath.Abs(p)
	}
	if aErr != nil {
		return nil, aErr
	}

	var file *os.File
	var oErr error
	if file, oErr = os.OpenFile(fp, os.O_RDWR|os.O_CREATE, 0660); oErr != nil {
		return nil, openError(fp, path)
	}

	return file, nil
}

func exist(path string) {
	if _, err := os.Stat(path); os.IsNotExist(err) {
		os.MkdirAll(path, os.ModeDir|0755)
	}
}

var openError = xrr.Xrror("unable to find or open file %s, provided %s").Out