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path: root/internal/plural/plural.go
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package plural

import "strings"

func Plural(s string) string {
	l := len(s)
	switch {
	case strings.HasSuffix(s, "y"):
		return s[:l-1] + "ies"
	case strings.HasSuffix(s, "us"):
		return s[:l-2] + "i"
	case strings.HasSuffix(s, "ch"), strings.HasSuffix(s, "x"), strings.HasSuffix(s, "s"):
		return s + "es"
	case strings.HasSuffix(s, "f"):
		return s[:l-1] + "ves"
	case strings.HasSuffix(s, "man"), strings.HasSuffix(s, "Man"):
		return s[:l-2] + "en"
	default:
		return s + "s"
	}
}

func Indefinite(s string, n int) string {
	if strings.IndexByte("AEIOUÜaeiouü", s[0]) > 0 {
		s = "an " + s
	} else {
		s = "a " + s
	}
	if n > 1 {
		s = Plural(s)
	}
	return s
}