update 1.19.2 bot, chat support

chat/decoration.go

@@ -0,0 +1,51 @@
+package chat
+
+type Decoration struct {
+	TranslationKey string   `nbt:"translation_key"`
+	Parameters     []string `nbt:"parameters"`
+	Style          struct {
+		Bold          bool   `nbt:"bold"`
+		Italic        bool   `nbt:"italic"`
+		UnderLined    bool   `nbt:"underlined"`
+		StrikeThrough bool   `nbt:"strikethrough"`
+		Obfuscated    bool   `nbt:"obfuscated"`
+		Color         string `nbt:"color"`
+		Insertion     string `nbt:"insertion"`
+		Font          string `nbt:"font"`
+	} `nbt:"style"`
+}
+
+type Type struct {
+	ID         int32
+	SenderName Message
+	TargetName *Message
+}
+
+func (t *Type) Decorate(content Message, d *Decoration) (msg Message) {
+	with := make([]Message, len(d.Parameters))
+	for i, para := range d.Parameters {
+		switch para {
+		case "sender":
+			with[i] = t.SenderName
+		case "target":
+			with[i] = *t.TargetName
+		case "content":
+			with[i] = content
+		default:
+			with[i] = Text("<nil>")
+		}
+	}
+	return Message{
+		Translate: d.TranslationKey,
+		With:      with,
+
+		Bold:          d.Style.Bold,
+		Italic:        d.Style.Italic,
+		UnderLined:    d.Style.UnderLined,
+		StrikeThrough: d.Style.StrikeThrough,
+		Obfuscated:    d.Style.Obfuscated,
+		Font:          d.Style.Font,
+		Color:         d.Style.Color,
+		Insertion:     d.Style.Insertion,
+	}
+}