Disabled formatting in URLs

Render.go

@@ -253,14 +253,13 @@ func (r *renderer) writeText(markdown string) {
 		searchStart   = 0
 		linkTextStart = -1
 		linkTextEnd   = -1
-		urlStart      = -1
 		codeStart     = -1
 		emStart       = -1
 		strongStart   = -1
 		strikeStart   = -1
-		parentheses   = 0
 	)
 
+begin:
 	for {
 		i := strings.IndexAny(markdown[searchStart:], "[]()`*_~")
 
@@ -282,30 +281,46 @@ func (r *renderer) writeText(markdown string) {
 			linkTextEnd = i
 
 		case '(':
-			if parentheses == 0 {
-				urlStart = i
+			if linkTextStart == -1 || linkTextEnd == -1 {
+				continue
 			}
 
-			parentheses++
+			level := 1
 
-		case ')':
-			parentheses--
+			for {
+				pos := strings.IndexAny(markdown[searchStart:], "()")
 
-			if parentheses == 0 && linkTextStart >= 0 && linkTextEnd >= 0 && urlStart >= 0 {
-				linkText := markdown[linkTextStart+1 : linkTextEnd]
-				linkURL := markdown[urlStart+1 : i]
+				if pos == -1 {
+					goto begin
+				}
 
-				r.WriteString("<a href=\"")
-				r.WriteString(sanitizeURL(linkURL))
-				r.WriteString("\">")
-				r.WriteString(html.EscapeString(linkText))
-				r.WriteString("</a>")
+				switch markdown[searchStart+pos] {
+				case '(':
+					level++
+				case ')':
+					level--
 
-				linkTextStart = -1
-				linkTextEnd = -1
-				urlStart = -1
+					if level == 0 {
+						urlEnd := searchStart + pos
+						searchStart = urlEnd + 1
 
-				tokenStart = i + 1
+						linkText := markdown[linkTextStart+1 : linkTextEnd]
+						linkURL := markdown[i+1 : urlEnd]
+
+						r.WriteString("<a href=\"")
+						r.WriteString(sanitizeURL(linkURL))
+						r.WriteString("\">")
+						r.WriteString(html.EscapeString(linkText))
+						r.WriteString("</a>")
+
+						linkTextStart = -1
+						linkTextEnd = -1
+						tokenStart = urlEnd + 1
+						goto begin
+					}
+				}
+
+				searchStart += pos + 1
 			}
 
 		case '`':