package transform import (	"fmt"	"strings"	"sync" 	"github.com/rclone/rclone/fs"	"golang.org/x/text/encoding/charmap") var (	cmaps = map[int]*charmap.Charmap{}	lock  sync.Mutex) type cmapChoices struct{} func (cmapChoices) Choices() []string {	choices := make([]string, 1)	i := 0	for _, enc := range charmap.All {		c, ok := enc.(*charmap.Charmap)		if !ok {			continue		}		name := strings.ReplaceAll(c.String(), " ", "-")		if name == "" {			name = fmt.Sprintf("unknown-%d", i)		}		lock.Lock()		cmaps[i] = c		lock.Unlock()		choices = append(choices, name)		i++	}	return choices} func (cmapChoices) Type() string {	return "string"} func charmapByID(cm fs.Enum[cmapChoices]) *charmap.Charmap {	lock.Lock()	c, ok := cmaps[int(cm)]	lock.Unlock()	if ok {		return c	}	return nil} func encodeWithReplacement(s string, cmap *charmap.Charmap) string {	return strings.Map(func(r rune) rune {		b, ok := cmap.EncodeRune(r)		if !ok {			return '_'		}		return cmap.DecodeByte(b)	}, s)} func toASCII(s string) string {	return strings.Map(func(r rune) rune {		if r <= 127 {			return r		}		return -1	}, s)}