filepath.go

package notes

import (
	"github.com/pkg/errors"
	"os/user"
	"path/filepath"
	"strings"
)

// canonPath canonicalizes given file path
func canonPath(path string) string {
	u, err := user.Current()
	if err != nil {
		return path // Give up
	}
	home := filepath.Clean(u.HomeDir)
	if !strings.HasPrefix(path, home) {
		return path
	}
	canon := strings.TrimPrefix(path, home)
	// Note: home went through filepath.Clean. So it does not have trailing slash and canon is
	// always prefixed with slash.
	return "~" + canon
}

func validateDirname(name string) error {
	if name == "" {
		return errors.New("Cannot be empty")
	}
	if strings.HasPrefix(name, ".") {
		return errors.New("Cannot start from '.'")
	}
	// https://en.wikipedia.org/wiki/Filename
	if strings.ContainsAny(name, "/\\?%*:|\"<>") {
		return errors.New("Cannot contain '/', '\\', '?', '%', '*', ':', '|', '\"', '<', '>' since they are reserved")
	}
	return nil
}