patch 8.2.0004: get E685 and E931 if buffer reload is interrupted

Problem:    Get E685 and E931 if buffer reload is interrupted.
Solution:   Do not abort deleting a dummy buffer. (closes #5361)

src/buffer.c

@@ -184,7 +184,7 @@ open_buffer(
 	 * There MUST be a memfile, otherwise we can't do anything
 	 * If we can't create one for the current buffer, take another buffer
 	 */
-	close_buffer(NULL, curbuf, 0, FALSE);
+	close_buffer(NULL, curbuf, 0, FALSE, FALSE);
 	FOR_ALL_BUFFERS(curbuf)
 	    if (curbuf->b_ml.ml_mfp != NULL)
 		break;
@@ -487,13 +487,16 @@ can_unload_buffer(buf_T *buf)
  * When "abort_if_last" is TRUE then do not close the buffer if autocommands
  * cause there to be only one window with this buffer.  e.g. when ":quit" is
  * supposed to close the window but autocommands close all other windows.
+ *
+ * When "ignore_abort" is TRUE don't abort even when aborting() returns TRUE.
  */
     void
 close_buffer(
     win_T	*win,		// if not NULL, set b_last_cursor
     buf_T	*buf,
     int		action,
-    int		abort_if_last)
+    int		abort_if_last,
+    int		ignore_abort)
 {
     int		is_curbuf;
     int		nwindows;
@@ -609,7 +612,8 @@ aucmd_abort:
 		goto aucmd_abort;
 	}
 #ifdef FEAT_EVAL
-	if (aborting())	    // autocmds may abort script processing
+	// autocmds may abort script processing
+	if (!ignore_abort && aborting())
 	    return;
 #endif
     }
@@ -662,13 +666,16 @@ aucmd_abort:
     is_curbuf = (buf == curbuf);
     buf->b_nwindows = nwindows;
 
-    buf_freeall(buf, (del_buf ? BFA_DEL : 0) + (wipe_buf ? BFA_WIPE : 0));
+    buf_freeall(buf, (del_buf ? BFA_DEL : 0)
+	           + (wipe_buf ? BFA_WIPE : 0)
+		   + (ignore_abort ? BFA_IGNORE_ABORT : 0));
 
     // Autocommands may have deleted the buffer.
     if (!bufref_valid(&bufref))
 	return;
 #ifdef FEAT_EVAL
-    if (aborting())	    // autocmds may abort script processing
+    // autocmds may abort script processing
+    if (!ignore_abort && aborting())
 	return;
 #endif
 
@@ -762,9 +769,10 @@ buf_clear_file(buf_T *buf)
  * buf_freeall() - free all things allocated for a buffer that are related to
  * the file.  Careful: get here with "curwin" NULL when exiting.
  * flags:
- * BFA_DEL	  buffer is going to be deleted
+ * BFA_DEL	     buffer is going to be deleted
- * BFA_WIPE	  buffer is going to be wiped out
+ * BFA_WIPE	     buffer is going to be wiped out
- * BFA_KEEP_UNDO  do not free undo information
+ * BFA_KEEP_UNDO     do not free undo information
+ * BFA_IGNORE_ABORT  don't abort even when aborting() returns TRUE
  */
     void
 buf_freeall(buf_T *buf, int flags)
@@ -815,7 +823,8 @@ buf_freeall(buf_T *buf, int flags)
     }
 
 #ifdef FEAT_EVAL
-    if (aborting())	    // autocmds may abort script processing
+    // autocmds may abort script processing
+    if ((flags & BFA_IGNORE_ABORT) == 0 && aborting())
 	return;
 #endif
 
@@ -1077,7 +1086,7 @@ handle_swap_exists(bufref_T *old_curbuf)
 	// open a new, empty buffer.
 	swap_exists_action = SEA_NONE;	// don't want it again
 	swap_exists_did_quit = TRUE;
-	close_buffer(curwin, curbuf, DOBUF_UNLOAD, FALSE);
+	close_buffer(curwin, curbuf, DOBUF_UNLOAD, FALSE, FALSE);
 	if (old_curbuf == NULL || !bufref_valid(old_curbuf)
 					      || old_curbuf->br_buf == curbuf)
 	    buf = buflist_new(NULL, NULL, 1L, BLN_CURBUF | BLN_LISTED);
@@ -1281,7 +1290,7 @@ empty_curbuf(
      * if the buffer still exists.
      */
     if (buf != curbuf && bufref_valid(&bufref) && buf->b_nwindows == 0)
-	close_buffer(NULL, buf, action, FALSE);
+	close_buffer(NULL, buf, action, FALSE, FALSE);
     if (!close_others)
 	need_fileinfo = FALSE;
     return retval;
@@ -1478,7 +1487,7 @@ do_buffer(
 	{
 	    close_windows(buf, FALSE);
 	    if (buf != curbuf && bufref_valid(&bufref) && buf->b_nwindows <= 0)
-		    close_buffer(NULL, buf, action, FALSE);
+		    close_buffer(NULL, buf, action, FALSE, FALSE);
 	    return OK;
 	}
 
@@ -1708,7 +1717,8 @@ set_curbuf(buf_T *buf, int action)
 	    close_buffer(prevbuf == curwin->w_buffer ? curwin : NULL, prevbuf,
 		    unload ? action : (action == DOBUF_GOTO
 			&& !buf_hide(prevbuf)
-			&& !bufIsChanged(prevbuf)) ? DOBUF_UNLOAD : 0, FALSE);
+			&& !bufIsChanged(prevbuf)) ? DOBUF_UNLOAD : 0,
+		    FALSE, FALSE);
 	    if (curwin != previouswin && win_valid(previouswin))
 	      // autocommands changed curwin, Grr!
 	      curwin = previouswin;
@@ -3296,7 +3306,7 @@ setfname(
 		return FAIL;
 	    }
 	    // delete from the list
-	    close_buffer(NULL, obuf, DOBUF_WIPE, FALSE);
+	    close_buffer(NULL, obuf, DOBUF_WIPE, FALSE, FALSE);
 	}
 	sfname = vim_strsave(sfname);
 	if (ffname == NULL || sfname == NULL)
@@ -5633,7 +5643,7 @@ buf_contents_changed(buf_T *buf)
     void
 wipe_buffer(
     buf_T	*buf,
-    int		aucmd UNUSED)	    // When TRUE trigger autocommands.
+    int		aucmd)	    // When TRUE trigger autocommands.
 {
     if (buf->b_fnum == top_file_num - 1)
 	--top_file_num;
@@ -5641,7 +5651,7 @@ wipe_buffer(
     if (!aucmd)		    // Don't trigger BufDelete autocommands here.
 	block_autocmds();
 
-    close_buffer(NULL, buf, DOBUF_WIPE, FALSE);
+    close_buffer(NULL, buf, DOBUF_WIPE, FALSE, TRUE);
 
     if (!aucmd)
 	unblock_autocmds();

src/ex_cmds.c

@@ -2742,7 +2742,7 @@ do_ecmd(
 		// oldwin->w_buffer to NULL.
 		u_sync(FALSE);
 		close_buffer(oldwin, curbuf,
-			       (flags & ECMD_HIDE) ? 0 : DOBUF_UNLOAD, FALSE);
+			 (flags & ECMD_HIDE) ? 0 : DOBUF_UNLOAD, FALSE, FALSE);
 
 		the_curwin->w_closing = FALSE;
 		--buf->b_locked;

src/ex_getln.c

@@ -4372,7 +4372,7 @@ open_cmdwin(void)
 	// win_close() may have already wiped the buffer when 'bh' is
 	// set to 'wipe'
 	if (bufref_valid(&bufref))
-	    close_buffer(NULL, bufref.br_buf, DOBUF_WIPE, FALSE);
+	    close_buffer(NULL, bufref.br_buf, DOBUF_WIPE, FALSE, FALSE);
 
 	// Restore window sizes.
 	win_size_restore(&winsizes);

src/misc2.c

@@ -1185,7 +1185,7 @@ free_all_mem(void)
 
 	set_bufref(&bufref, buf);
 	nextbuf = buf->b_next;
-	close_buffer(NULL, buf, DOBUF_WIPE, FALSE);
+	close_buffer(NULL, buf, DOBUF_WIPE, FALSE, FALSE);
 	if (bufref_valid(&bufref))
 	    buf = nextbuf;	/* didn't work, try next one */
 	else

src/proto/buffer.pro

@@ -5,7 +5,7 @@ int open_buffer(int read_stdin, exarg_T *eap, int flags);
 void set_bufref(bufref_T *bufref, buf_T *buf);
 int bufref_valid(bufref_T *bufref);
 int buf_valid(buf_T *buf);
-void close_buffer(win_T *win, buf_T *buf, int action, int abort_if_last);
+void close_buffer(win_T *win, buf_T *buf, int action, int abort_if_last, int ignore_abort);
 void buf_clear_file(buf_T *buf);
 void buf_freeall(buf_T *buf, int flags);
 void goto_buffer(exarg_T *eap, int start, int dir, int count);

src/quickfix.c

@@ -1925,7 +1925,7 @@ wipe_qf_buffer(qf_info_T *qi)
 	{
 	    // If the quickfix buffer is not loaded in any window, then
 	    // wipe the buffer.
-	    close_buffer(NULL, qfbuf, DOBUF_WIPE, FALSE);
+	    close_buffer(NULL, qfbuf, DOBUF_WIPE, FALSE, FALSE);
 	    qi->qf_bufnr = INVALID_QFBUFNR;
 	}
     }
@@ -6311,7 +6311,7 @@ unload_dummy_buffer(buf_T *buf, char_u *dirname_start)
 {
     if (curbuf != buf)		// safety check
     {
-	close_buffer(NULL, buf, DOBUF_UNLOAD, FALSE);
+	close_buffer(NULL, buf, DOBUF_UNLOAD, FALSE, TRUE);
 
 	// When autocommands/'autochdir' option changed directory: go back.
 	restore_start_dir(dirname_start);

src/testdir/test_trycatch.vim

@@ -1972,6 +1972,29 @@ func Test_builtin_func_error()
   call assert_equal('jlmnpqrtueghivyzACD', g:Xpath)
 endfunc
 
-" Modelines								    {{{1
+func Test_reload_in_try_catch()
+  call writefile(['x'], 'Xreload')
+  set autoread
+  edit Xreload
+  tabnew
+  call writefile(['xx'], 'Xreload')
+  augroup ReLoad
+    au FileReadPost Xreload let x = doesnotexist
+    au BufReadPost Xreload let x = doesnotexist
+  augroup END
+  try
+    edit Xreload
+  catch
+  endtry
+  tabnew
+
+  tabclose
+  tabclose
+  autocmd! ReLoad
+  set noautoread
+  bwipe! Xreload
+  call delete('Xreload')
+endfunc
+
+" Modeline								    {{{1
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker
-"-------------------------------------------------------------------------------

src/version.c

@@ -742,6 +742,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4,
 /**/
     3,
 /**/

src/vim.h

@@ -2458,9 +2458,10 @@ typedef enum {
 #define VIF_GET_OLDFILES	8	// load v:oldfiles
 
 // flags for buf_freeall()
-#define BFA_DEL		1	// buffer is going to be deleted
+#define BFA_DEL		 1	// buffer is going to be deleted
-#define BFA_WIPE	2	// buffer is going to be wiped out
+#define BFA_WIPE	 2	// buffer is going to be wiped out
-#define BFA_KEEP_UNDO	4	// do not free undo information
+#define BFA_KEEP_UNDO	 4	// do not free undo information
+#define BFA_IGNORE_ABORT 8	// do not abort for aborting()
 
 // direction for nv_mousescroll() and ins_mousescroll()
 #define MSCR_DOWN	0	// DOWN must be FALSE

src/window.c

@@ -2410,7 +2410,7 @@ win_close_buffer(win_T *win, int action, int abort_if_last)
 
 	set_bufref(&bufref, curbuf);
 	win->w_closing = TRUE;
-	close_buffer(win, win->w_buffer, action, abort_if_last);
+	close_buffer(win, win->w_buffer, action, abort_if_last, FALSE);
 	if (win_valid_any_tab(win))
 	    win->w_closing = FALSE;
 	// Make sure curbuf is valid. It can become invalid if 'bufhidden' is
@@ -2677,7 +2677,8 @@ win_close_othertab(win_T *win, int free_buf, tabpage_T *tp)
 
     if (win->w_buffer != NULL)
 	// Close the link to the buffer.
-	close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0, FALSE);
+	close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0,
+								 FALSE, FALSE);
 
     // Careful: Autocommands may have closed the tab page or made it the
     // current tab page.
@@ -5001,7 +5002,7 @@ win_free_popup(win_T *win)
     if (bt_popup(win->w_buffer))
 	win_close_buffer(win, DOBUF_WIPE_REUSE, FALSE);
     else
-	close_buffer(win, win->w_buffer, 0, FALSE);
+	close_buffer(win, win->w_buffer, 0, FALSE, FALSE);
 # if defined(FEAT_TIMERS)
     if (win->w_popup_timer != NULL)
 	stop_timer(win->w_popup_timer);