feat(types): parse mode in generated types (#38)

* fix(types): use fmt.Stringer in ParseMode defention

examples/quote-bot/main.go

@@ -104,7 +104,7 @@ func run(ctx context.Context) error {
 					Description: quoteText(quote.Text),
 					InputMessageContent: tg.InputTextMessageContent{
 						MessageText: messageText,
-						ParseMode:   tg.HTML.String(),
+						ParseMode:   tg.HTML,
 					},
 					ReplyMarkup: tg.NewInlineKeyboardMarkup(
 						tg.NewButtonRow(

parse_mode.go

@@ -1,13 +1,16 @@
 package tg
 
 import (
+	"encoding"
+	"fmt"
 	"html"
 	"regexp"
 	"strings"
 )
 
 type ParseMode interface {
-	String() string
+	encoding.TextMarshaler
+	fmt.Stringer
 
 	// Change separator for next calls
 	Sep(v string) ParseMode
@@ -140,6 +143,10 @@ func (pm parseMode) Line(v ...string) string {
 	return strings.Join(v, " ")
 }
 
+func (pm parseMode) MarshalText() ([]byte, error) {
+	return []byte(pm.String()), nil
+}
+
 func (pm parseMode) String() string {
 	return pm.name
 }

parse_mode_test.go

@@ -8,6 +8,10 @@ import (
 
 func TestParseModeHTML(t *testing.T) {
 	assert.Equal(t, "HTML", HTML.String())
+	marshaled, err := HTML.MarshalText()
+	assert.NoError(t, err)
+	assert.Equal(t, "HTML", string(marshaled))
+
 	assert.Equal(t, "Hello World", HTML.Line("Hello", "World"))
 	assert.Equal(t, "Hello\nWorld", HTML.Text("Hello", "World"))
 	assert.Equal(t, "<b>Hello World</b>", HTML.Bold("Hello", "World"))