view: add view_cursors_new_force function

To create a cursor even if there already exists one at the same
position. Should only be used if all but one of the cursors will
later be removed.

2 files changed, 17 insertions, 4 deletions

diff --git a/view.c b/view.c
index ee6d5fb..f2a0c90 100644
--- a/view.c
+++ b/view.c
@@ -1059,7 +1059,7 @@ size_t view_screenline_goto(View *view, int n) {
 	return pos;
 }
 
-Cursor *view_cursors_new(View *view, size_t pos) {
+static Cursor *cursors_new(View *view, size_t pos, bool force) {
 	Cursor *c = calloc(1, sizeof(*c));
 	if (!c)
 		return NULL;
@@ -1074,7 +1074,7 @@ Cursor *view_cursors_new(View *view, size_t pos) {
 
 	Cursor *prev = NULL, *next = NULL;
 	size_t cur = view_cursors_pos(view->cursor);
-	if (pos > cur) {
+	if (pos >= cur) {
 		prev = view->cursor;
 		for (next = prev->next; next; prev = next, next = next->next) {
 			cur = view_cursors_pos(next);
@@ -1090,7 +1090,7 @@ Cursor *view_cursors_new(View *view, size_t pos) {
 		}
 	}
 
-	if (pos == cur)
+	if (pos == cur && !force)
 		goto err;
 
 	for (Cursor *after = next; after; after = after->next)
@@ -1115,6 +1115,14 @@ err:
 	return NULL;
 }
 
+Cursor *view_cursors_new(View *view, size_t pos) {
+	return cursors_new(view, pos, false);
+}
+
+Cursor *view_cursors_new_force(View *view, size_t pos) {
+	return cursors_new(view, pos, true);
+}
+
 int view_cursors_count(View *view) {
 	return view->cursor_count;
 }
diff --git a/view.h b/view.h
index fd0c329..fadaaba 100644
--- a/view.h
+++ b/view.h
@@ -119,8 +119,13 @@ void view_scroll_to(View*, size_t pos);
  * position is visible. if the position is in the middle of a line, try to
  * adjust the viewport in such a way that the whole line is displayed */
 void view_cursor_to(View*, size_t pos);
-/* create a new cursor, at given position */
+/* create a new cursor at given position, fails if there already
+ * exists a cursor at the same position */
 Cursor *view_cursors_new(View*, size_t pos);
+/* create a new cursor even if there already is one located at the
+ * same position, this should only be used if the one of the two
+ * cursors will later be disposed */
+Cursor *view_cursors_new_force(View*, size_t pos);
 /* get number of active cursors */
 int view_cursors_count(View*);
 /* get index/relative order at time of creation of a cursor [0,count-1] */