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// Package maildirpp implements Maildir++.
package maildirpp
import (
"errors"
"strings"
)
const separator = '.'
func Split(key string) ([]string, error) {
if len(key) == 0 || key[0] != '.' {
return nil, errors.New("maildirpp: invalid key")
}
return strings.Split(key, string(separator))[1:], nil
}
func Join(elems []string) (key string, err error) {
for _, d := range elems {
if strings.ContainsRune(d, separator) {
return "", errors.New("maildirpp: directory name cannot contain a dot")
}
}
return "." + strings.Join(elems, string(separator)), nil
}
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