implement scroll autocommand

1 files changed, 25 insertions, 0 deletions

diff --git a/src/nvim/edit.c b/src/nvim/edit.c
index de2346a9d8..447f922767 100644
--- a/src/nvim/edit.c
+++ b/src/nvim/edit.c
@@ -1482,6 +1482,31 @@ static void ins_redraw(
     }
   }
 
+  if (ready && has_event(EVENT_SCROLL)
+      && (curwin->w_last_topline != curwin->w_topline ||
+          curwin->w_last_leftcol != curwin->w_leftcol)) {
+
+    // XXX is the buf changedtick thing necessary?
+    // XXX apply_autocmds vs ins_apply_autocmds?
+    // XXX why can't we re-use normal_check_window_scrolled()?
+
+    aco_save_T aco;
+    varnumber_T tick = buf_get_changedtick(curbuf);
+
+    // save and restore curwin and curbuf, in case the autocmd changes them
+    aucmd_prepbuf(&aco, curbuf);
+    apply_autocmds(EVENT_SCROLL, NULL, NULL, false, curbuf);
+    aucmd_restbuf(&aco);
+    curbuf->b_last_changedtick_pum = buf_get_changedtick(curbuf);
+    if (tick != buf_get_changedtick(curbuf)) {  // see ins_apply_autocmds()
+      u_save(curwin->w_cursor.lnum,
+             (linenr_T)(curwin->w_cursor.lnum + 1));
+    }
+
+    curwin->w_last_topline = curwin->w_topline;
+    curwin->w_last_leftcol = curwin->w_leftcol;
+  }
+
   if (curwin->w_p_cole > 0 && conceal_cursor_line(curwin)
       && conceal_cursor_moved) {
     redrawWinline(curwin, curwin->w_cursor.lnum);