Find dollar sign in a text string for adding emoji

[punkzberryz]

From Easy way to add emoji to text message #456

When we want to add Emoji in text message, we use $ as a placeholder inside the text and provide the index of the $. (ref)

Function FindDollarSignIndexInUni16Text helps to identify the the dollar-sign position inside the string.

Example use case can be found in Kitchen Signk

		message := "Hello, $ hello こんにちは $, สวัสดีครับ $"
		emojiIndexes := linebot.FindDollarSignIndexInUni16Text(message)
		emojis := []messaging_api.Emoji{}
		for _, index := range emojiIndexes {
			emojis = append(emojis, messaging_api.Emoji{
				Index:     int32(index),
				ProductId: "5ac1bfd5040ab15980c9b435",
				EmojiId:   "001",
			})
		}
		result, _, err := app.bot.ReplyMessageWithHttpInfo(
			&messaging_api.ReplyMessageRequest{
				ReplyToken: replyToken,
				Messages: []messaging_api.MessageInterface{
					messaging_api.TextMessage{
						Text:   message,
						Emojis: emojis,
					},
				},
			},
		)

Example result shown in the image

[CLAassistant]

All committers have signed the CLA.

[Yang-33]

Thank you, @punkzberryz ! Almost all looks good to me. Let me leave minor comments. After fixing minors, this change will be released as v8.7.0!

[Yang-33]

To clarify 36 is $, how about this?

Suggested change

	bytes := utf16.Encode([]rune(text))
	for i := range bytes {
	if bytes[i] == 36 {
	encoded := utf16.Encode([]rune(text))
	for i, unit := range encoded {
	if unit == '$' {

[punkzberryz]

The value unit itself is actually value 36. Because the value has been encoded.

But I see your point. So I will do this instead:

type CharInUTF16 uint16

const dollarSign CharInUTF16 = 36

...

encoded := utf16.Encode([]rune(text))
	for i, unit := range encoded {

		if unit == uint16(dollarSign) {

[Yang-33]

thanks!

[Yang-33]

Thank you, @punkzberryz !