(draft): telegram markdown v2 string builder

tgmd/utils.go

@@ -0,0 +1,71 @@
+package tgmd
+
+import (
+	"strconv"
+	"strings"
+
+	"git.scuroneko.dev/scuroneko/laniakea"
+)
+
+// Helpers in this file generate Telegram MarkdownV2.
+// All user-provided text is escaped.
+
+// TODO Markdown v2 escaping. GoDoc and tests
+
+// WithBold returns s wrapped as bold Telegram Markdown text.
+func WithBold(s string) string {
+	return "*" + s + "*"
+}
+
+// WithItalic returns s wrapped as italic Telegram Markdown text.
+func WithItalic(s string) string {
+	return "_" + s + "_"
+}
+
+func WithUnderline(s string) string {
+	return "__" + s + "__"
+}
+func WithStrikethrough(s string) string {
+	return "~" + s + "~"
+}
+func WithSpoiler(s string) string {
+	return "||" + s + "||"
+}
+
+// WithLink returns a Telegram Markdown link for text and URL.
+func WithLink(text, url string) string {
+	return "[" + text + "](" + url + ")"
+}
+
+func WithMention(text string, userID uint64) string {
+	return "[" + text + "](tg://user?id=" + strconv.FormatUint(userID, 10) + ")"
+}
+func WithEmoji(text, emojiID string) string {
+	return "[" + text + "](tg://emoji?id=" + emojiID + ")"
+}
+
+func WithTime(text string, unix uint64) string {
+	return "![" + text + "](tg://time?unix=" + strconv.FormatUint(unix, 10) + ")"
+}
+func WithTimeFormat(text string, unix uint64, format string) string {
+	return "![" + text + "](tg://time?unix=" +
+		strconv.FormatUint(unix, 10) +
+		"&format=" + format + ")"
+}
+
+// WithInlineCode returns s wrapped as inline code Telegram Markdown text.
+func WithInlineCode(s string) string {
+	return "`" + s + "`"
+}
+func WithBlockCode(s string) string {
+	return "```\n" + s + "\n```"
+}
+func WithBlockCodeLanguage(s, lang string) string {
+	return "```" + lang + "\n" + s + "\n```"
+}
+func WithQuote(s string) string {
+	return ">" + strings.ReplaceAll(laniakea.EscapeMarkdownV2(s), "\n", "\n>")
+}
+func WithQuoteExpandable(s string) string {
+	return "**>" + s
+}