(new): rich message support

(fix): runtime reliability
(tests): regression coverage
(doc): v1.1 release notes

tgfmt/utils.go

@@ -1,6 +1,8 @@
 package tgfmt
 
-import "strings"
+import (
+	"strings"
+)
 
 func escapeHTML(s string) string {
 	s = strings.ReplaceAll(s, "&", "&")
@@ -9,7 +11,21 @@ func escapeHTML(s string) string {
 	s = strings.ReplaceAll(s, `"`, """)
 	return s
 }
-func escapeRich(s string) Rich { return Rich(escapeHTML(s)) }
+
+func escapeMD(s string) string {
+	s = strings.ReplaceAll(s, "_", `\_`)
+	s = strings.ReplaceAll(s, "*", `\*`)
+	s = strings.ReplaceAll(s, "[", `\[`)
+	s = strings.ReplaceAll(s, "`", "\\`")
+	return s
+}
+func escapeMDv2(s string) string {
+	symbols := []string{"\\", "_", "*", "[", "]", "(", ")", "~", "`", ">", "#", "+", "-", "=", "|", "{", "}", ".", "!"}
+	for _, symbol := range symbols {
+		s = strings.ReplaceAll(s, symbol, "\\"+symbol)
+	}
+	return s
+}
 
 // EscapePunctuation escapes '.', '!' and '-' for MarkdownV2 fragments.
 func EscapePunctuation(s string) string {