pass img type and size

txt.go

@@ -171,7 +171,7 @@ type astTransformer struct {
 func (t *astTransformer) Transform(node *ast.Document, reader text.Reader, pc parser.Context) {
 	ast.Walk(node, func(n ast.Node, entering bool) (ast.WalkStatus, error) {
 		if link, ok := n.(*ast.Link); ok && entering {
-			link.Destination = append([]byte("/?t=txt&url="), link.Destination...)
+			link.Destination = append([]byte("/?m=html&t="+t.imgType+"&s="+strconv.Itoa(t.maxSize)+"&url="), link.Destination...)
 		}
 		if img, ok := n.(*ast.Image); ok && entering {
 			// TODO: dynamic extension based on form value