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[gnu-emacs] / src / undo.c

diff --git a/src/undo.c b/src/undo.c
index 104c3bb3fc4c10ed34eea4e2264f661b25dcda23..be5b27020540a882287ca5a128ee82392a7e065b 100644 (file)
--- a/src/undo.c
+++ b/src/undo.c
@@ -1,13 +1,13 @@
 /* undo handling for GNU Emacs.
-   Copyright (C) 1990, 1993-1994, 2000-2015 Free Software Foundation,
+   Copyright (C) 1990, 1993-1994, 2000-2016 Free Software Foundation,
    Inc.
 
 This file is part of GNU Emacs.
 
 GNU Emacs is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
 
 GNU Emacs is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -22,10 +22,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "lisp.h"
 #include "buffer.h"
-
-/* Position of point last time we inserted a boundary.  */
-static struct buffer *last_boundary_buffer;
-static ptrdiff_t last_boundary_position;
+#include "keyboard.h"
 
 /* The first time a command records something for undo.
    it also allocates the undo-boundary object
@@ -36,35 +33,40 @@ static Lisp_Object pending_boundary;
 
 /* Record point as it was at beginning of this command (if necessary)
    and prepare the undo info for recording a change.
+   Prepare the undo info for recording a change. */
+static void
+prepare_record (void)
+{
+  /* Allocate a cons cell to be the undo boundary after this command.  */
+  if (NILP (pending_boundary))
+    pending_boundary = Fcons (Qnil, Qnil);
+
+  if (MODIFF <= SAVE_MODIFF)
+    record_first_change ();
+}
+
+/* Record point as it was at beginning of this command.
    PT is the position of point that will naturally occur as a result of the
    undo record that will be added just after this command terminates.  */
-
 static void
 record_point (ptrdiff_t pt)
 {
-  bool at_boundary;
-
   /* Don't record position of pt when undo_inhibit_record_point holds.  */
   if (undo_inhibit_record_point)
     return;
 
-  /* Allocate a cons cell to be the undo boundary after this command.  */
-  if (NILP (pending_boundary))
-    pending_boundary = Fcons (Qnil, Qnil);
+  bool at_boundary;
 
   at_boundary = ! CONSP (BVAR (current_buffer, undo_list))
                 || NILP (XCAR (BVAR (current_buffer, undo_list)));
 
-  if (MODIFF <= SAVE_MODIFF)
-    record_first_change ();
+  prepare_record ();
 
   /* If we are just after an undo boundary, and
      point wasn't at start of deleted range, record where it was.  */
-  if (at_boundary
-      && current_buffer == last_boundary_buffer
-      && last_boundary_position != pt)
+  if (at_boundary)
     bset_undo_list (current_buffer,
-                   Fcons (make_number (last_boundary_position),
+                   Fcons (make_number (pt),
                           BVAR (current_buffer, undo_list)));
 }
 
@@ -81,7 +83,7 @@ record_insert (ptrdiff_t beg, ptrdiff_t length)
   if (EQ (BVAR (current_buffer, undo_list), Qt))
     return;
 
-  record_point (beg);
+  prepare_record ();
 
   /* If this is following another insertion and consecutive with it
      in the buffer, combine the two.  */
@@ -153,7 +155,6 @@ record_marker_adjustments (ptrdiff_t from, ptrdiff_t to)
 /* Record that a deletion is about to take place, of the characters in
    STRING, at location BEG.  Optionally record adjustments for markers
    in the region STRING occupies in the current buffer.  */
-
 void
 record_delete (ptrdiff_t beg, Lisp_Object string, bool record_markers)
 {
@@ -162,15 +163,19 @@ record_delete (ptrdiff_t beg, Lisp_Object string, bool record_markers)
   if (EQ (BVAR (current_buffer, undo_list), Qt))
     return;
 
+  if (point_before_last_command_or_undo != beg
+      && buffer_before_last_command_or_undo == current_buffer)
+    record_point (point_before_last_command_or_undo);
+
   if (PT == beg + SCHARS (string))
     {
       XSETINT (sbeg, -beg);
-      record_point (PT);
+      prepare_record ();
     }
   else
     {
       XSETFASTINT (sbeg, beg);
-      record_point (beg);
+      prepare_record ();
     }
 
   /* primitive-undo assumes marker adjustments are recorded
@@ -224,7 +229,7 @@ record_property_change (ptrdiff_t beg, ptrdiff_t length,
                        Lisp_Object buffer)
 {
   Lisp_Object lbeg, lend, entry;
-  struct buffer *obuf = current_buffer, *buf = XBUFFER (buffer);
+  struct buffer *buf = XBUFFER (buffer);
 
   if (EQ (BVAR (buf, undo_list), Qt))
     return;
@@ -268,10 +273,11 @@ but another undo command will undo to the previous boundary.  */)
        bset_undo_list (current_buffer,
                        Fcons (Qnil, BVAR (current_buffer, undo_list)));
     }
-  last_boundary_position = PT;
-  last_boundary_buffer = current_buffer;
 
   Fset (Qundo_auto__last_boundary_cause, Qexplicit);
+  point_before_last_command_or_undo = PT;
+  buffer_before_last_command_or_undo = current_buffer;
+
   return Qnil;
 }
 
@@ -423,8 +429,6 @@ syms_of_undo (void)
   pending_boundary = Qnil;
   staticpro (&pending_boundary);
 
-  last_boundary_buffer = NULL;
-
   defsubr (&Sundo_boundary);
 
   DEFVAR_INT ("undo-limit", undo_limit,