view: add query function for multiple cursors

main.c

@@ -1253,7 +1253,7 @@ static const char *cursors_align_indent(Vis *vis, const char *keys, const Arg *a
 
 static const char *cursors_clear(Vis *vis, const char *keys, const Arg *arg) {
 	View *view = vis_view(vis);
-	if (view_cursors_count(view) > 1)
+	if (view_cursors_multiple(view))
 		view_cursors_clear(view);
 	else
 		view_cursors_selection_clear(view_cursors_primary_get(view));
@@ -1317,8 +1317,7 @@ static const char *cursors_remove(Vis *vis, const char *keys, const Arg *arg) {
 
 static const char *cursors_navigate(Vis *vis, const char *keys, const Arg *arg) {
 	View *view = vis_view(vis);
-	bool multiple_cursors = view_cursors_next(view_cursors(view));
-	if (!multiple_cursors)
+	if (!view_cursors_multiple(view))
 		return wscroll(vis, keys, arg);
 	Cursor *c = view_cursors_primary_get(view);
 	if (arg->i < 0) {
@@ -1471,7 +1470,7 @@ static const char *undo(Vis *vis, const char *keys, const Arg *arg) {
 	size_t pos = text_undo(vis_text(vis));
 	if (pos != EPOS) {
 		View *view = vis_view(vis);
-		if (view_cursors_count(view) == 1)
+		if (!view_cursors_multiple(view))
 			view_cursor_to(view, pos);
 		/* redraw all windows in case some display the same file */
 		vis_draw(vis);
@@ -1483,7 +1482,7 @@ static const char *redo(Vis *vis, const char *keys, const Arg *arg) {
 	size_t pos = text_redo(vis_text(vis));
 	if (pos != EPOS) {
 		View *view = vis_view(vis);
-		if (view_cursors_count(view) == 1)
+		if (!view_cursors_multiple(view))
 			view_cursor_to(view, pos);
 		/* redraw all windows in case some display the same file */
 		vis_draw(vis);

ui-curses.c

@@ -683,7 +683,7 @@ static void ui_window_draw(UiWin *w) {
 	}
 	short selection_bg = win->styles[UI_STYLE_SELECTION].bg;
 	short cursor_line_bg = win->styles[UI_STYLE_CURSOR_LINE].bg;
-	bool multiple_cursors = view_cursors_next(view_cursors(win->view));
+	bool multiple_cursors = view_cursors_multiple(win->view);
 	attr_t attr = A_NORMAL;
 	for (const Line *l = view_lines_get(win->view); l; l = l->next) {
 		bool cursor_line = l->lineno == cursor_lineno;

view.c

@@ -1090,6 +1090,10 @@ int view_cursors_count(View *view) {
 	return i;
 }
 
+bool view_cursors_multiple(View *view) {
+	return view->cursors && view->cursors->next;
+}
+
 static void view_cursors_free(Cursor *c) {
 	if (!c)
 		return;

view.h

@@ -123,6 +123,8 @@ void view_cursor_to(View*, size_t pos);
 Cursor *view_cursors_new(View*);
 /* get number of active cursors */
 int view_cursors_count(View*);
+/* exist there more than 1 cursor */
+bool view_cursors_multiple(View*);
 /* dispose an existing cursor with its associated selection (if any),
  * not applicaple for the last existing cursor */
 void view_cursors_dispose(Cursor*);