* src/split.c (current_window): call screen_get_frame.

(split_frame): call screen_get_frame to get appropriate structure.
(split_frame): call find_window_number to get appropriate
structure.
(remove_all_splits): call screen_get_frame to get appropriate
structure.
(resize_frame): make sure all frames that will be resized are big
enough for the resize.
(resize_frame): return int
(resize_shrink_to_window): call find_window_number to get the
appropriate structure.
(resize_frame_right): return int
(resize_frame_left): likewise
(resize_frame_top): likewise
(resize_frame_bottom): likewise
(resize_frame_horizontally): backup the frameset and restore it if
the resize fails. Do not allow a frame to be resized too small or
too big.
(resize_frame_vertically): likewise
(remove_frame): call find_window_number to get the appropriate
structure.
(set_active_frame): likewise
(blank_frame): likewise
(show_frame_message): call screen_get_frame to get the appropriate
structure.

* src/screen.c (screen_width): new function (and prototype)
(screen_height): likewise
(screen_left): likewise
(screen_right): likewise
(screen_top): likewise
(screen_bottom): likewise
(screen_copy_frameset): likewise
(screen_restore_frameset): likewise
(frameset_free): likewise
(screen_get_frame): likewise

* src/split.c (maximize_frame): call screen_width and
screen_height to get the size for the frame.

* src/ratpoison.h: include screen.h

* src/manage.c (move_window):

* src/frame.h (frame_copy): new prototype
(frame_dump): likewise

* src/frame.c (frame_copy): new function
(frame_dump): likewise

* src/events.c (unmap_notify): compare frame numbers, not
pointers.
(client_msg): call screen_get_frame when blanking the frame.

* src/data.h (EMPTY): new define
(struct rp_window_frame): replace the win field with
win_number. Dependant code updated.
(struct rp_window): replace frame with frame_number. Dependant
code updated.
(struct screen_info): replace rp_current_frame with current_frame
and change type to int. Dependant code updated.

* src/Makefile.am (ratpoison_SOURCES): added screen.h and screen.c

14 files changed, 557 insertions, 148 deletions

diff --git a/ChangeLog b/ChangeLog
index f8fbd8c..30c15de 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,69 @@
+2003-03-30  Shawn Betts  <sabetts@sfu.ca>
+
+	* src/split.c (current_window): call screen_get_frame.
+	(split_frame): call screen_get_frame to get appropriate structure.
+	(split_frame): call find_window_number to get appropriate
+	structure.
+	(remove_all_splits): call screen_get_frame to get appropriate
+	structure.
+	(resize_frame): make sure all frames that will be resized are big
+	enough for the resize.
+	(resize_frame): return int
+	(resize_shrink_to_window): call find_window_number to get the
+	appropriate structure.
+	(resize_frame_right): return int
+	(resize_frame_left): likewise
+	(resize_frame_top): likewise
+	(resize_frame_bottom): likewise
+	(resize_frame_horizontally): backup the frameset and restore it if
+	the resize fails. Do not allow a frame to be resized too small or
+	too big.
+	(resize_frame_vertically): likewise
+	(remove_frame): call find_window_number to get the appropriate
+	structure.
+	(set_active_frame): likewise
+	(blank_frame): likewise
+	(show_frame_message): call screen_get_frame to get the appropriate
+	structure.
+
+	* src/screen.c (screen_width): new function (and prototype)
+	(screen_height): likewise
+	(screen_left): likewise
+	(screen_right): likewise
+	(screen_top): likewise
+	(screen_bottom): likewise
+	(screen_copy_frameset): likewise
+	(screen_restore_frameset): likewise
+	(frameset_free): likewise
+	(screen_get_frame): likewise
+
+	* src/split.c (maximize_frame): call screen_width and
+	screen_height to get the size for the frame.
+
+	* src/ratpoison.h: include screen.h
+
+	* src/manage.c (move_window): 
+
+	* src/frame.h (frame_copy): new prototype
+	(frame_dump): likewise
+
+	* src/frame.c (frame_copy): new function
+	(frame_dump): likewise
+
+	* src/events.c (unmap_notify): compare frame numbers, not
+	pointers.
+	(client_msg): call screen_get_frame when blanking the frame.
+
+	* src/data.h (EMPTY): new define
+	(struct rp_window_frame): replace the win field with
+	win_number. Dependant code updated.
+	(struct rp_window): replace frame with frame_number. Dependant
+	code updated.
+	(struct screen_info): replace rp_current_frame with current_frame
+	and change type to int. Dependant code updated.
+
+	* src/Makefile.am (ratpoison_SOURCES): added screen.h and screen.c
+
 2003-03-25  Shawn Betts  <sabetts@sfu.ca>
 
 	* src/split.h (show_frame_message): new prototype
diff --git a/src/Makefile.am b/src/Makefile.am
index 798564b..5a10925 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -17,7 +17,7 @@
 ## along with this program; if not, write to the Free Software
 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##
-## $Id: Makefile.am,v 1.13 2003/03/07 11:43:26 sabetts Exp $
+## $Id: Makefile.am,v 1.14 2003/03/31 07:06:23 sabetts Exp $
 
 bin_PROGRAMS		= ratpoison
 
@@ -47,6 +47,8 @@ ratpoison_SOURCES	= actions.c		\
 			ratpoison.h		\
 			sbuf.c			\
 			sbuf.h			\
+			screen.h		\
+			screen.c		\
 			split.c			\
 			split.h			\
 			window.c		\
diff --git a/src/actions.c b/src/actions.c
index 8e18bf2..661e8f2 100644
--- a/src/actions.c
+++ b/src/actions.c
@@ -674,9 +674,9 @@ cmd_prev_frame (int interactive, void *data)
 {
   rp_window_frame *frame;
 
-  frame = find_frame_prev (current_screen()->rp_current_frame);
+  frame = find_frame_prev (screen_get_frame (current_screen(), current_screen()->current_frame));
   if (!frame)
-    message (MESSAGE_NO_OTHER_WINDOW);
+    message (MESSAGE_NO_OTHER_FRAME);
   else
     set_active_frame (frame);
 
@@ -716,7 +716,7 @@ cmd_next_frame (int interactive, void *data)
 {
   rp_window_frame *frame;
 
-  frame = find_frame_next (current_screen()->rp_current_frame);
+  frame = find_frame_next (screen_get_frame (current_screen(), current_screen()->current_frame));
   if (!frame)
     message (MESSAGE_NO_OTHER_FRAME);
   else
@@ -778,7 +778,7 @@ cmd_select (int interactive, void *data)
     {
       if (strlen (str) == 1 && str[0] == '-')
 	{
-	  blank_frame (current_screen()->rp_current_frame);
+	  blank_frame (screen_get_frame (current_screen(), current_screen()->current_frame));
 	}
 /*       else if ((w = find_window_name (str))) */
 /* 	{ */
@@ -1333,17 +1333,19 @@ read_split (const char *str, int max)
 char *
 cmd_h_split (int interactive, void *data)
 {
+  rp_window_frame *frame;
   int pixels;
 
+  frame = screen_get_frame (current_screen(), current_screen()->current_frame);
+
   /* Default to dividing the frame in half. */
   if (data == NULL)
-    pixels = current_screen()->rp_current_frame->height / 2;
+    pixels = frame->height / 2;
   else 
-    pixels = read_split (data, current_screen()->rp_current_frame->height);
-
+    pixels = read_split (data, frame->height);
 
   if (pixels > 0)
-    h_split_frame (current_screen()->rp_current_frame, pixels);
+    h_split_frame (frame, pixels);
   else
     message (" hsplit: invalid argument ");    
 
@@ -1353,16 +1355,19 @@ cmd_h_split (int interactive, void *data)
 char *
 cmd_v_split (int interactive, void *data)
 {
+  rp_window_frame *frame;
   int pixels;
 
+  frame = screen_get_frame (current_screen(), current_screen()->current_frame);
+
   /* Default to dividing the frame in half. */
   if (data == NULL)
-    pixels = current_screen()->rp_current_frame->width / 2;
+    pixels = frame->width / 2;
   else
-    pixels = read_split (data, current_screen()->rp_current_frame->width);
+    pixels = read_split (data, frame->width);
 
   if (pixels > 0)
-    v_split_frame (current_screen()->rp_current_frame, pixels);
+    v_split_frame (frame, pixels);
   else
     message (" vsplit: invalid argument ");    
 
@@ -1390,11 +1395,11 @@ cmd_remove (int interactive, void *data)
       return NULL;
     }
 
-  frame = find_frame_next (s->rp_current_frame);
+  frame = find_frame_next (screen_get_frame (s, s->current_frame));
 
   if (frame)
     {
-      remove_frame (current_screen()->rp_current_frame);
+      remove_frame (screen_get_frame (s, s->current_frame));
       set_active_frame (frame);
     }
 
@@ -1406,7 +1411,7 @@ cmd_shrink (int interactive, void *data)
 {
   screen_info *s = current_screen ();
 
-  resize_shrink_to_window (s->rp_current_frame);
+  resize_shrink_to_window (screen_get_frame (s, s->current_frame));
   return NULL;
 }
 
@@ -1424,6 +1429,7 @@ cmd_resize (int interactive, void *data)
       unsigned int mod;
       KeySym c;
       Window fwin;
+      struct list_head *bk;
 
       /* If we haven't got at least 2 frames, there isn't anything to
 	 scale. */
@@ -1432,26 +1438,46 @@ cmd_resize (int interactive, void *data)
       XGetInputFocus (dpy, &fwin, &revert);
       XSetInputFocus (dpy, s->key_window, RevertToPointerRoot, CurrentTime);
 
+      /* Save the frameset in case the user aborts. */
+      bk = screen_copy_frameset (s);
+
       while (1)
 	{
 	  show_frame_message (" Resize frame ");
 	  nbytes = read_key (&c, &mod, buffer, sizeof (buffer), 1);
 
 	  if (c == RESIZE_VGROW_KEY && mod == RESIZE_VGROW_MODIFIER)
-	    resize_frame_vertically (s->rp_current_frame, defaults.frame_resize_unit);
+	    resize_frame_vertically (screen_get_frame (s, s->current_frame), defaults.frame_resize_unit);
 	  else if (c == RESIZE_VSHRINK_KEY && mod == RESIZE_VSHRINK_MODIFIER)
-	    resize_frame_vertically (s->rp_current_frame, -defaults.frame_resize_unit);
+	    resize_frame_vertically (screen_get_frame (s, s->current_frame), -defaults.frame_resize_unit);
 	  else if (c == RESIZE_HGROW_KEY && mod == RESIZE_HGROW_MODIFIER)
-	    resize_frame_horizontally (s->rp_current_frame, defaults.frame_resize_unit);
+	    resize_frame_horizontally (screen_get_frame (s, s->current_frame), defaults.frame_resize_unit);
 	  else if (c == RESIZE_HSHRINK_KEY && mod == RESIZE_HSHRINK_MODIFIER)
-	    resize_frame_horizontally (s->rp_current_frame, -defaults.frame_resize_unit);
+	    resize_frame_horizontally (screen_get_frame (s, s->current_frame), -defaults.frame_resize_unit);
 	  else if (c == RESIZE_SHRINK_TO_WINDOW_KEY 
 		   && mod == RESIZE_SHRINK_TO_WINDOW_MODIFIER)
-	    resize_shrink_to_window (s->rp_current_frame);
+	    resize_shrink_to_window (screen_get_frame (s, s->current_frame));
+	  else if (c == INPUT_ABORT_KEY && mod == INPUT_ABORT_MODIFIER)
+	    {
+	      rp_window_frame *cur;
+
+	      screen_restore_frameset (s, bk);
+	      list_for_each_entry (cur, &s->rp_window_frames, node)
+		{
+		  maximize_all_windows_in_frame (cur);
+		}
+	      break;
+	    }
 	  else if (c == RESIZE_END_KEY && mod == RESIZE_END_MODIFIER)
-	    break;
+	    {
+	      frameset_free (bk);
+	      break;
+	    }
 	}
 
+      /* It is our responsibility to free this. */
+      free (bk);
+
       hide_frame_indicator ();
       XSetInputFocus (dpy, fwin, RevertToPointerRoot, CurrentTime);
     }
@@ -1465,8 +1491,8 @@ cmd_resize (int interactive, void *data)
 	  return NULL;
 	}
 
-      resize_frame_horizontally (s->rp_current_frame, xdelta);
-      resize_frame_vertically (s->rp_current_frame, ydelta);
+      resize_frame_horizontally (screen_get_frame (s, s->current_frame), xdelta);
+      resize_frame_vertically (screen_get_frame (s, s->current_frame), ydelta);
     }
 
   return NULL;
@@ -2104,7 +2130,7 @@ cmd_defborder (int interactive, void *data)
   /* Update all the visible windows. */
   list_for_each_entry (win,&rp_mapped_window,node)
     {
-      if (win->frame)
+      if (win_get_frame (win))
 	maximize (win);
     }
 
@@ -2462,7 +2488,7 @@ cmd_focusup (int interactive, void *data)
 {
   rp_window_frame *frame;
 
-  if ((frame = find_frame_up (current_screen()->rp_current_frame)))
+  if ((frame = find_frame_up (screen_get_frame (current_screen(), current_screen()->current_frame))))
     set_active_frame (frame);
 
   return NULL;
@@ -2473,7 +2499,7 @@ cmd_focusdown (int interactive, void *data)
 {
   rp_window_frame *frame;
 
-  if ((frame = find_frame_down (current_screen()->rp_current_frame)))
+  if ((frame = find_frame_down (screen_get_frame (current_screen(), current_screen()->current_frame))))
     set_active_frame (frame);
 
   return NULL;
@@ -2484,7 +2510,7 @@ cmd_focusleft (int interactive, void *data)
 {
   rp_window_frame *frame;
 
-  if ((frame = find_frame_left (current_screen()->rp_current_frame)))
+  if ((frame = find_frame_left (screen_get_frame (current_screen(), current_screen()->current_frame))))
     set_active_frame (frame);
 
   return NULL;
@@ -2495,7 +2521,7 @@ cmd_focusright (int interactive, void *data)
 {
   rp_window_frame *frame;
 
-  if ((frame = find_frame_right (current_screen()->rp_current_frame)))
+  if ((frame = find_frame_right (screen_get_frame (current_screen(), current_screen()->current_frame))))
     set_active_frame (frame);
 
   return NULL;
@@ -2707,7 +2733,7 @@ cmd_nextscreen (int interactive, void *data)
   if (new_screen >= num_screens)
     new_screen = 0;
 
-  set_active_frame (screens[new_screen].rp_current_frame);
+  set_active_frame (screen_get_frame (&screens[new_screen], screens[new_screen].current_frame));
 
   return NULL;
 }
@@ -2728,7 +2754,7 @@ cmd_prevscreen (int interactive, void *data)
   if (new_screen < 0)
     new_screen = num_screens - 1;
 
-  set_active_frame (screens[new_screen].rp_current_frame);
+  set_active_frame (screen_get_frame (&screens[new_screen], screens[new_screen].current_frame));
 
   return NULL;
 }
@@ -2797,7 +2823,7 @@ cmd_tmpwm (int interactive, void *data)
       /* Remove the window from the frame. */
       frame = find_windows_frame (win);
       if (frame) cleanup_frame (frame);
-      if (frame == win->scr->rp_current_frame) set_active_frame (frame);
+      if (frame->number == win->scr->current_frame) set_active_frame (frame);
 
       /* put the window in the unmapped list. */
       numset_release (rp_window_numset, win->number);
@@ -2949,3 +2975,9 @@ cmd_fselect (int interactive, void *data)
 
   return NULL;
 }
+
+char *
+cmd_restore (int interactively, void *data)
+{
+  return NULL;
+}
diff --git a/src/data.h b/src/data.h
index e87d63e..c7bba0f 100644
--- a/src/data.h
+++ b/src/data.h
@@ -32,6 +32,11 @@
 #define FONT_HEIGHT(f) ((f)->max_bounds.ascent + (f)->max_bounds.descent)
 
 #define WIN_EVENTS (StructureNotifyMask | PropertyChangeMask | ColormapChangeMask | FocusChangeMask)
+/* EMPTY is used when a frame doesn't contain a window, or a window
+   doesn't have a frame. Any time a field refers to the number of a
+   window/frame/screen/etc, Use EMPTY to denote a lack there of. */
+#define EMPTY -1
+
 
 typedef struct rp_window rp_window;
 typedef struct screen_info screen_info;
@@ -42,7 +47,9 @@ struct rp_window_frame
 {
   int number;
   int x, y, width, height;
-  rp_window *win;
+
+  /* The number of the window that is focused in this frame. */
+  int win_number;
 
   /* For determining the last frame. */
   int last_access;
@@ -88,7 +95,7 @@ struct rp_window
   /* A window can be visible inside a frame but not the frame's
      current window. This keeps track of what frame the window was
      mapped into. */
-  rp_window_frame *frame;
+  int frame_number;
 
   struct list_head node;
 };
@@ -113,9 +120,9 @@ struct screen_info
   /* Keep track of which numbers have been given to frames. */
   struct numset *frames_numset;
 
-  /* Pointer to the currently focused frame. One for each screen so
+  /* The number of the currently focused frame. One for each screen so
      when you switch screens the focus doesn't get frobbed. */
-  rp_window_frame *rp_current_frame;
+  int current_frame;
 };
 
 struct rp_action
diff --git a/src/events.c b/src/events.c
index b656f16..e73661f 100644
--- a/src/events.c
+++ b/src/events.c
@@ -94,7 +94,7 @@ unmap_notify (XEvent *ev)
 	 window. */
       frame = find_windows_frame (win);
       if (frame) cleanup_frame (frame);
-      if (frame == win->scr->rp_current_frame) set_active_frame (frame);
+      if (frame->number == win->scr->current_frame) set_active_frame (frame);
 
       withdraw_window (win);
       break;
@@ -180,8 +180,12 @@ destroy_window (XDestroyWindowEvent *ev)
      have been cleaned up with an unmap notify event, but just in
      case... */
   frame = find_windows_frame (win);
-  if (frame) cleanup_frame (frame);
-  if (frame == win->scr->rp_current_frame) set_active_frame (frame);
+  if (frame)
+    {
+      cleanup_frame (frame);
+      if (frame->number == win->scr->current_frame) 
+	set_active_frame (frame);
+    }
 
   unmanage (win);
 
@@ -319,7 +323,7 @@ client_msg (XClientMessageEvent *ev)
 	      if (w)
 		set_active_window (w);
 	      else
-		blank_frame (win->scr->rp_current_frame);
+		blank_frame (screen_get_frame (win->scr, win->scr->current_frame));
 	    }
 	}
       else
diff --git a/src/frame.c b/src/frame.c
index 6faf26e..6ac0277 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -124,3 +124,44 @@ frame_free (screen_info *s, rp_window_frame *f)
   numset_release (s->frames_numset, f->number);
   free (f);
 }
+
+
+rp_window_frame *
+frame_copy (rp_window_frame *frame)
+{
+  rp_window_frame *copy;
+
+  copy = xmalloc (sizeof (rp_window_frame));
+
+  copy->number = frame->number;
+  copy->x = frame->x;
+  copy->y = frame->y;
+  copy->width = frame->width;
+  copy->height = frame->height;
+  copy->win_number = frame->win_number;
+  copy->last_access = frame->last_access;
+
+  return copy;
+}
+
+char *
+frame_dump (rp_window_frame *frame)
+{
+  char *tmp;
+  struct sbuf *s;
+
+  s = sbuf_new (0);
+  sbuf_printf (s, "%d %d %d %d %d %d %d", 
+	       frame->number,
+	       frame->x,
+	       frame->y,
+	       frame->width,
+	       frame->height,
+	       frame->win_number,
+	       frame->last_access);
+
+  /* Extract the string and return it, and don't forget to free s. */
+  tmp = sbuf_get (s);
+  free (s);
+  return tmp;
+}
diff --git a/src/frame.h b/src/frame.h
index f2e1e4b..256bea3 100644
--- a/src/frame.h
+++ b/src/frame.h
@@ -38,5 +38,7 @@ int frame_left (rp_window_frame *frame);
 
 rp_window_frame *frame_new (screen_info *s);
 void frame_free (screen_info *s, rp_window_frame *f);
+rp_window_frame *frame_copy (rp_window_frame *frame);
+char *frame_dump (rp_window_frame *frame);
 
 #endif
diff --git a/src/manage.c b/src/manage.c
index 7a19934..93fe869 100644
--- a/src/manage.c
+++ b/src/manage.c
@@ -397,26 +397,30 @@ get_state (rp_window *win)
 static void
 move_window (rp_window *win)
 {
-  if (win->frame == NULL) 
+  rp_window_frame *frame;
+
+  if (win->frame_number == EMPTY) 
     return;
 
+  frame = win_get_frame (win);
+
   /* X coord. */
   switch (win->gravity)
     {
     case NorthWestGravity:
     case WestGravity:
     case SouthWestGravity:
-      win->x = win->frame->x;
+      win->x = frame->x;
       break;
     case NorthGravity:
     case CenterGravity:
     case SouthGravity:
-      win->x = win->frame->x + (win->frame->width - win->border * 2) / 2 - win->width / 2;
+      win->x = frame->x + (frame->width - win->border * 2) / 2 - win->width / 2;
       break;
     case NorthEastGravity:
     case EastGravity:
     case SouthEastGravity:
-      win->x = win->frame->x + win->frame->width - win->width - win->border;
+      win->x = frame->x + frame->width - win->width - win->border;
       break;
     }
 
@@ -426,17 +430,17 @@ move_window (rp_window *win)
     case NorthEastGravity:
     case NorthGravity:
     case NorthWestGravity:
-      win->y = win->frame->y;
+      win->y = frame->y;
       break;
     case EastGravity:
     case CenterGravity:
     case WestGravity:
-      win->y = win->frame->y + (win->frame->height - win->border * 2) / 2 - win->height / 2;
+      win->y = frame->y + (frame->height - win->border * 2) / 2 - win->height / 2;
       break;
     case SouthEastGravity:
     case SouthGravity:
     case SouthWestGravity:
-      win->y = win->frame->y + win->frame->height - win->height - win->border;
+      win->y = frame->y + frame->height - win->height - win->border;
       break;
     }
 }
@@ -449,15 +453,15 @@ maximize_transient (rp_window *win)
   rp_window_frame *frame;
   int maxx, maxy;
 
+  frame = win_get_frame (win);
+
   /* We can't maximize a window if it has no frame. */
-  if (win->frame == NULL)
+  if (frame == NULL)
     return;
 
   /* Set the window's border */
   win->border = defaults.window_border_width;
 
-  frame = win->frame;
-
   /* Always use the window's current width and height for
      transients. */
   maxx = win->width;
@@ -507,15 +511,15 @@ maximize_normal (rp_window *win)
   rp_window_frame *frame;
   int maxx, maxy;
 
+  frame = win_get_frame (win);
+
   /* We can't maximize a window if it has no frame. */
-  if (win->frame == NULL)
+  if (frame == NULL)
     return;
 
   /* Set the window's border */
   win->border = defaults.window_border_width;
 
-  frame = win->frame;
-
   /* Honour the window's maximum size */
   if (win->hints->flags & PMaxSize)
     {
@@ -670,7 +674,7 @@ hide_window (rp_window *win)
   if (win == NULL) return;
 
   /* An unmapped window is not inside a frame. */
-  win->frame = NULL;
+  win->frame_number = EMPTY;
 
   /* Ignore the unmap_notify event. */
   XSelectInput(dpy, win->w, WIN_EVENTS&~(StructureNotifyMask));
@@ -748,7 +752,7 @@ hide_others (rp_window *win)
     {
       if (find_windows_frame (cur) 
 	  || cur->state != NormalState 
-	  || cur->frame != frame)
+	  || cur->frame_number != frame->number)
 	continue;
 
       hide_window (cur);
diff --git a/src/ratpoison.h b/src/ratpoison.h
index 4a5dde7..cc1420f 100644
--- a/src/ratpoison.h
+++ b/src/ratpoison.h
@@ -69,6 +69,7 @@ extern XGCValues gv;
 #include "sbuf.h"
 #include "split.h"
 #include "frame.h"
+#include "screen.h"
 
 void clean_up ();
 screen_info *find_screen (Window w);
diff --git a/src/screen.c b/src/screen.c
new file mode 100644
index 0000000..aa7b1df
--- /dev/null
+++ b/src/screen.c
@@ -0,0 +1,118 @@
+/* Copyright (C) 2000-2003 Shawn Betts
+ *
+ * This file is part of ratpoison.
+ *
+ * ratpoison 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 2, or (at your option)
+ * any later version.
+ * 
+ * ratpoison is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307 USA
+ */
+
+#include "ratpoison.h"
+
+int
+screen_width (screen_info *s)
+{
+  return DisplayWidth (dpy, s->screen_num) - defaults.padding_right - defaults.padding_left;
+}
+
+int
+screen_height (screen_info *s)
+{
+  return DisplayHeight (dpy, s->screen_num) - defaults.padding_bottom - defaults.padding_top;
+}
+
+int
+screen_left (screen_info *s)
+{
+  return defaults.padding_left;
+}
+
+int
+screen_right (screen_info *s)
+{
+  return screen_left (s) + screen_width (s);
+}
+
+int
+screen_top (screen_info *s)
+{
+  return defaults.padding_top;
+}
+
+int
+screen_bottom (screen_info *s)
+{
+  return screen_top (s) + screen_height (s);
+}
+
+/* Returns a pointer to a list of frames. */
+struct list_head *
+screen_copy_frameset (screen_info *s)
+{
+  struct list_head *head;
+  rp_window_frame *cur;
+
+  /* Init our new list. */
+  head = xmalloc (sizeof (struct list_head));
+  INIT_LIST_HEAD (head);
+
+  /* Copy each frame to our new list. */
+  list_for_each_entry (cur, &s->rp_window_frames, node)
+    {
+      list_add_tail (&(frame_copy (cur))->node, head);
+    }
+
+  return head;
+}
+
+/* Set head as the frameset, deleting the existing one. */
+void
+screen_restore_frameset (screen_info *s, struct list_head *head)
+{
+  frameset_free (&s->rp_window_frames);
+  INIT_LIST_HEAD (&s->rp_window_frames);
+
+  /* Hook in our new frameset. */
+  list_splice (head, &s->rp_window_frames);
+}
+
+/* Given a list of frames, free them, but don't remove their numbers
+   from the numset. */
+void
+frameset_free (struct list_head *head)
+{
+  rp_window_frame *frame;
+  struct list_head *iter, *tmp;
+
+  list_for_each_safe_entry (frame, iter, tmp, head, node)
+    {
+      /* FIXME: what if rp_window_frames has memory inside its struct
+	 that needs to be freed? */
+      free (frame);
+    }
+}
+
+rp_window_frame *
+screen_get_frame (screen_info *s, int frame_num)
+{
+  rp_window_frame *cur;
+
+  list_for_each_entry (cur, &s->rp_window_frames, node)
+    {
+      if (cur->number == frame_num)
+	return cur;
+    }
+  
+  return NULL;
+}
diff --git a/src/screen.h b/src/screen.h
new file mode 100644
index 0000000..5b0bbc2
--- /dev/null
+++ b/src/screen.h
@@ -0,0 +1,36 @@
+/* Copyright (C) 2000-2003 Shawn Betts
+ *
+ * This file is part of ratpoison.
+ *
+ * ratpoison 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 2, or (at your option)
+ * any later version.
+ * 
+ * ratpoison is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307 USA
+ */
+
+#ifndef SCREEN_H
+#define SCREEN_H
+
+int screen_bottom (screen_info *s);
+int screen_top (screen_info *s);
+int screen_right (screen_info *s);
+int screen_left (screen_info *s);
+int screen_height (screen_info *s);
+int screen_width (screen_info *s);
+
+struct list_head *screen_copy_frameset (screen_info *s);
+void screen_restore_frameset (screen_info *s, struct list_head *head);
+void frameset_free (struct list_head *head);
+rp_window_frame *screen_get_frame (screen_info *s, int frame_num);
+
+#endif
diff --git a/src/split.c b/src/split.c
index b0d6ff1..7db350a 100644
--- a/src/split.c
+++ b/src/split.c
@@ -85,14 +85,20 @@ cleanup_frame (rp_window_frame *frame)
 rp_window *
 set_frames_window (rp_window_frame *frame, rp_window *win)
 {
-  rp_window *last_win;
+  int last_win;
 
-  last_win = frame->win;
-  frame->win = win;
+  last_win = frame->win_number;
   if (win)
-    win->frame = frame;
+    {
+      frame->win_number = win->number;
+      win->frame_number = frame->number;
+    }
+  else
+    {
+      frame->win_number = EMPTY;
+    }
 
-  return last_win;
+  return find_window_number (last_win);
 }
 
 static screen_info *
@@ -120,7 +126,7 @@ maximize_all_windows_in_frame (rp_window_frame *frame)
 
   list_for_each_entry (win, &rp_mapped_window, node)
     {
-      if (win->frame == frame)
+      if (win->frame_number == frame->number)
 	{
 	  maximize (win);
 	}
@@ -136,22 +142,24 @@ maximize_frame (rp_window_frame *frame)
   frame->x = defaults.padding_left;
   frame->y = defaults.padding_top;
 
-  frame->width = DisplayWidth (dpy, s->screen_num) - defaults.padding_right - defaults.padding_left;
-  frame->height = DisplayHeight (dpy, s->screen_num) - defaults.padding_bottom - defaults.padding_top;
+  frame->width = screen_width (s);
+  frame->height = screen_height (s);
 }
 
 /* Create a full screen frame */
 static void
 create_initial_frame (screen_info *screen)
 {
-  screen->rp_current_frame = frame_new (screen);
+  rp_window_frame *frame;
 
-  list_add_tail (&screen->rp_current_frame->node, &screen->rp_window_frames);
+  frame = frame_new (screen);
+  screen->current_frame = frame->number;
+  list_add_tail (&frame->node, &screen->rp_window_frames);
 
-  update_last_access (screen->rp_current_frame);
+  update_last_access (frame);
 
-  maximize_frame (screen->rp_current_frame);
-  set_frames_window (screen->rp_current_frame, NULL);
+  maximize_frame (frame);
+  set_frames_window (frame, NULL);
 }
 
 void
@@ -179,7 +187,7 @@ find_last_frame (screen_info *s)
 
   list_for_each_entry (cur, &s->rp_window_frames, node)
     {
-      if (cur != s->rp_current_frame
+      if (cur->number != s->current_frame
 	  && cur->last_access > last_access)
 	{
 	  last_access = cur->last_access;
@@ -201,7 +209,7 @@ find_windows_frame (rp_window *win)
 
   list_for_each_entry (cur, &s->rp_window_frames, node)
     {
-      if (cur->win == win) return cur;
+      if (cur->win_number == win->number) return cur;
     }
 
   return NULL;
@@ -224,7 +232,8 @@ find_frame_prev (rp_window_frame *frame)
 rp_window *
 current_window ()
 {
-  return screens[rp_current_screen].rp_current_frame->win;
+  return find_window_number (screen_get_frame (&screens[rp_current_screen],
+					       screens[rp_current_screen].current_frame)->win_number);
 }
 
 static int
@@ -262,7 +271,7 @@ find_window_for_frame (rp_window_frame *frame)
 	  && !find_windows_frame (cur)
 	  && cur->last_access >= last_access
 	  && window_fits_in_frame (cur, frame)
-	  && !cur->frame)
+	  && cur->frame_number == EMPTY)
 	{
 	  most_recent = cur;
 	  last_access = cur->last_access;
@@ -286,14 +295,8 @@ split_frame (rp_window_frame *frame, int way, int pixels)
   /* Make our new frame. */
   new_frame = frame_new (s);
 
-  /* It seems intuitive to make the last frame the newly created
-     frame. */
-  update_last_access (new_frame);
-
-  /* TODO: don't put the new frame at the end of the list, put it
-     after the existing frame. Then cycling frames cycles in the order
-     they were created. */
-  list_add (&new_frame->node, &s->rp_current_frame->node);
+  /* Add the frame to the frameset. */
+  list_add (&new_frame->node, &(screen_get_frame (s, s->current_frame)->node));
 
   set_frames_window (new_frame, NULL);
 
@@ -335,10 +338,10 @@ split_frame (rp_window_frame *frame, int way, int pixels)
     }
 
   /* resize the existing frame */
-  if (frame->win)
+  if (frame->win_number != EMPTY)
     {
       maximize_all_windows_in_frame (frame);
-      XRaiseWindow (dpy, frame->win->w);
+      XRaiseWindow (dpy, find_window_number (frame->win_number)->w);
     }
 
   show_frame_indicator();
@@ -371,14 +374,14 @@ remove_all_splits ()
   /* Hide all the windows not in the current frame. */
   list_for_each_entry (win, &rp_mapped_window, node)
     {
-      if (win->frame != s->rp_current_frame)
+      if (win->frame_number != s->current_frame)
 	hide_window (win);
     }
 
   /* Delete all the frames except the current one. */
   list_for_each_safe_entry (frame, iter, tmp, &s->rp_window_frames, node)
     {
-      if (frame != s->rp_current_frame)
+      if (frame->number != s->current_frame)
 	{
 	  list_del (&frame->node);
 	  frame_free (s, frame);
@@ -386,30 +389,35 @@ remove_all_splits ()
     }
 
   /* Maximize the frame and the windows in the frame. */
-  maximize_frame (s->rp_current_frame);
-  maximize_all_windows_in_frame (s->rp_current_frame);
+  maximize_frame (screen_get_frame (s, s->current_frame));
+  maximize_all_windows_in_frame (screen_get_frame (s, s->current_frame));
 }
 
 /* Shrink the size of the frame to fit it's current window. */
 void
 resize_shrink_to_window (rp_window_frame *frame)
 {
-  if (frame->win == NULL) return;
+  rp_window *win;
+
+  if (frame->win_number == EMPTY) return;
 
-  resize_frame_horizontally (frame, frame->win->width + frame->win->border*2 - frame->width);
-  resize_frame_vertically (frame, frame->win->height + frame->win->border*2 - frame->height);
+  win = find_window_number (frame->win_number);
+
+  resize_frame_horizontally (frame, win->width + win->border*2 - frame->width);
+  resize_frame_vertically (frame, win->height + win->border*2 - frame->height);
 }
 
 /* resize_frame is a generic frame resizer that can resize vertically,
    horizontally, to the right, to the left, etc. It all depends on the
-   functions passed to it. */
-static void
+   functions passed to it. Returns -1 if the resize failed, 0 for
+   success. */
+static int
 resize_frame (rp_window_frame *frame, rp_window_frame *pusher, int diff,
 	      int (*c1)(rp_window_frame *), int (c2)(rp_window_frame *),
 	      int (*c3)(rp_window_frame *), int (c4)(rp_window_frame *),
 	      void (*resize1)(rp_window_frame *, int),
 	      void (*resize2)(rp_window_frame *, int),
-	      void (*resize3)(rp_window_frame *, rp_window_frame *, int))
+	      int (*resize3)(rp_window_frame *, rp_window_frame *, int))
 {
   screen_info *s = frames_screen (frame);
   rp_window_frame *cur;
@@ -423,6 +431,10 @@ resize_frame (rp_window_frame *frame, rp_window_frame *pusher, int diff,
 	 moved then this frame is affected by the resize. */
       if ((*c1)(cur) == (*c3)(frame))
 	{
+	  /* If the frame can't get any smaller, then fail. */
+	  if (diff > 0 
+	      && abs ((*c3)(cur) - (*c1)(cur)) - diff <= defaults.window_border_width * 2)
+	    return -1;
 	  /* Test for this circumstance:
 	     --+
 	     | |+-+
@@ -451,7 +463,9 @@ resize_frame (rp_window_frame *frame, rp_window_frame *pusher, int diff,
 		   || ((*c4)(cur) > (*c2)(frame)
 		       && (*c4)(cur) <= (*c4)(frame)))
 	    {
-	      resize3 (cur, frame, -diff);
+	      /* Attempt to resize cur. */
+	      if (resize3 (cur, frame, -diff) == -1)
+		return -1;
 	    }
 	}
     }
@@ -459,47 +473,49 @@ resize_frame (rp_window_frame *frame, rp_window_frame *pusher, int diff,
   /* Finally, resize the frame and the windows inside. */
   (*resize1) (frame, diff);
   maximize_all_windows_in_frame (frame);
+
+  return 0;
 }
 
-static void resize_frame_bottom (rp_window_frame *frame, rp_window_frame *pusher, int diff);
-static void resize_frame_top (rp_window_frame *frame, rp_window_frame *pusher, int diff);
-static void resize_frame_left (rp_window_frame *frame, rp_window_frame *pusher, int diff);
-static void resize_frame_right (rp_window_frame *frame, rp_window_frame *pusher, int diff);
+static int resize_frame_bottom (rp_window_frame *frame, rp_window_frame *pusher, int diff);
+static int resize_frame_top (rp_window_frame *frame, rp_window_frame *pusher, int diff);
+static int resize_frame_left (rp_window_frame *frame, rp_window_frame *pusher, int diff);
+static int resize_frame_right (rp_window_frame *frame, rp_window_frame *pusher, int diff);
 
 /* Resize frame by moving it's right side. */
-static void
+static int
 resize_frame_right (rp_window_frame *frame, rp_window_frame *pusher, int diff)
 {
-  resize_frame (frame, pusher, diff,
-		frame_left, frame_top, frame_right, frame_bottom,
-		frame_resize_right, frame_resize_left, resize_frame_left);
+  return resize_frame (frame, pusher, diff,
+		       frame_left, frame_top, frame_right, frame_bottom,
+		       frame_resize_right, frame_resize_left, resize_frame_left);
 }
 
 /* Resize frame by moving it's left side. */
-static void
+static int
 resize_frame_left (rp_window_frame *frame, rp_window_frame *pusher, int diff)
 {
-  resize_frame (frame, pusher, diff,
-		frame_right, frame_top, frame_left, frame_bottom,
-		frame_resize_left, frame_resize_right, resize_frame_right);
+  return resize_frame (frame, pusher, diff,
+		       frame_right, frame_top, frame_left, frame_bottom,
+		       frame_resize_left, frame_resize_right, resize_frame_right);
 }
 
 /* Resize frame by moving it's top side. */
-static void
+static int
 resize_frame_top (rp_window_frame *frame, rp_window_frame *pusher, int diff)
 {
-  resize_frame (frame, pusher, diff,
-		frame_bottom, frame_left, frame_top, frame_right,
-		frame_resize_up, frame_resize_down, resize_frame_bottom);
+  return resize_frame (frame, pusher, diff,
+		       frame_bottom, frame_left, frame_top, frame_right,
+		       frame_resize_up, frame_resize_down, resize_frame_bottom);
 }
 
 /* Resize frame by moving it's bottom side. */
-static void
+static int
 resize_frame_bottom (rp_window_frame *frame, rp_window_frame *pusher, int diff)
 {
-  resize_frame (frame, pusher, diff,
-		frame_top, frame_left, frame_bottom, frame_right,
-		frame_resize_down, frame_resize_up, resize_frame_top);
+  return resize_frame (frame, pusher, diff,
+		       frame_top, frame_left, frame_bottom, frame_right,
+		       frame_resize_down, frame_resize_up, resize_frame_top);
 }
 
 /* Resize frame diff pixels by expanding it to the right. If the frame
@@ -507,19 +523,45 @@ resize_frame_bottom (rp_window_frame *frame, rp_window_frame *pusher, int diff)
 void
 resize_frame_horizontally (rp_window_frame *frame, int diff)
 {
+  int (*resize_fn)(rp_window_frame *, rp_window_frame*, int);
+  struct list_head *l;
   screen_info *s = frames_screen (frame);
 
   if (num_frames (s) < 2 || diff == 0)
     return;
 
-  if (frame_right (frame) < DisplayWidth (dpy, s->screen_num) - defaults.padding_right - defaults.padding_left)
+  if (frame_width (frame) + diff <= defaults.window_border_width * 2)
+    return;
+
+  /* Find out which resize function to use. */
+  if (frame_right (frame) < screen_right (s))
+    {
+      resize_fn = resize_frame_right;
+    }
+  else if (frame_left (frame) > screen_left (s))
+    {
+      resize_fn = resize_frame_left;
+    }
+  else
+    {
+      return;
+    }
+
+  /* Copy the frameset. If the resize fails, then we restore the
+     original one. */
+  l = screen_copy_frameset (s);
+
+  if ((*resize_fn) (frame, NULL, diff) == -1)
     {
-      resize_frame_right (frame, NULL, diff);
+      screen_restore_frameset (s, l);
     }
-  else if (frame_left (frame) > defaults.padding_left)
+  else
     {
-      resize_frame_left (frame, NULL, diff);
+      frameset_free (l);
     }
+
+  /* It's our responsibility to free this. */
+  free (l);
 }
 
 /* Resize frame diff pixels by expanding it down. If the frame is
@@ -527,19 +569,45 @@ resize_frame_horizontally (rp_window_frame *frame, int diff)
 void
 resize_frame_vertically (rp_window_frame *frame, int diff)
 {
+  int (*resize_fn)(rp_window_frame *, rp_window_frame*, int);
+  struct list_head *l;
   screen_info *s = frames_screen (frame);
 
   if (num_frames (s) < 2 || diff == 0)
     return;
 
-  if (frame_bottom (frame) < DisplayHeight (dpy, s->screen_num) - defaults.padding_bottom - defaults.padding_top)
+  if (frame_height (frame) + diff <= defaults.window_border_width * 2)
+    return;
+
+  /* Find out which resize function to use. */
+  if (frame_bottom (frame) < screen_bottom (s))
+    {
+      resize_fn = resize_frame_bottom;
+    }
+  else if (frame_top (frame) > screen_top (s))
+    {
+      resize_fn = resize_frame_top;
+    }
+  else
+    {
+      return;
+    }
+
+  /* Copy the frameset. If the resize fails, then we restore the
+     original one. */
+  l = screen_copy_frameset (s);
+
+  if ((*resize_fn) (frame, NULL, diff) == -1)
     {
-      resize_frame_bottom (frame, NULL, diff);
+      screen_restore_frameset (s, l);
     }
-  else if (frame_top (frame) > defaults.padding_top)
+  else
     {
-      resize_frame_top (frame, NULL, diff);
+      frameset_free (l);
     }
+
+  /* It's our responsibility to free this. */
+  free (l);
 }
 
 static int
@@ -623,6 +691,7 @@ remove_frame (rp_window_frame *frame)
   screen_info *s;
   int area;
   rp_window_frame *cur;
+  rp_window *win;
 
   if (frame == NULL) return;
 
@@ -632,22 +701,23 @@ remove_frame (rp_window_frame *frame)
   PRINT_DEBUG (("Total Area: %d\n", area));
 
   list_del (&frame->node);
-  hide_window (frame->win);
-  hide_others (frame->win);
+  win = find_window_number (frame->win_number);
+  hide_window (win);
+  hide_others (win);
 
   list_for_each_entry (cur, &s->rp_window_frames, node)
     {
       rp_window_frame tmp_frame;
       int fits = 0;
 
-      if (cur->win)
-	{
-	  PRINT_DEBUG (("Trying frame containing window '%s'\n", window_name (cur->win)));
-	}
-      else
-	{
-	  PRINT_DEBUG (("Trying some empty frame\n"));
-	}
+/*       if (cur->win_number != EMPTY) */
+/* 	{ */
+/* 	  PRINT_DEBUG (("Trying frame containing window '%s'\n", window_name (cur->win))); */
+/* 	} */
+/*       else */
+/* 	{ */
+/* 	  PRINT_DEBUG (("Trying some empty frame\n")); */
+/* 	} */
 
       /* Backup the frame */
       memcpy (&tmp_frame, cur, sizeof (rp_window_frame));
@@ -716,10 +786,11 @@ remove_frame (rp_window_frame *frame)
 	  /* The current frame fits into the new space so keep its
 	     new frame parameters and maximize the window to fit
 	     the new frame size. */
-	  if (cur->win)
+	  if (cur->win_number != EMPTY)
 	    {
+	      win = find_window_number (cur->win_number);
 	      maximize_all_windows_in_frame (cur);
-	      XRaiseWindow (dpy, cur->win->w);
+	      XRaiseWindow (dpy, win->w);
 	    }
 	}
       else
@@ -738,18 +809,23 @@ set_active_frame (rp_window_frame *frame)
 {
   screen_info *old_s = current_screen();
   screen_info *s = frames_screen (frame);
-  rp_window_frame *old = current_screen()->rp_current_frame;
+  int old = current_screen()->current_frame;
+  rp_window *win, *old_win;
+
+  win = find_window_number (frame->win_number);
+  old_win = find_window_number (screen_get_frame (current_screen(), 
+						  current_screen()->current_frame)->win_number);
 
   /* Make the switch */
-  give_window_focus (frame->win, old->win);
+  give_window_focus (win, old_win);
   update_last_access (frame);
-  s->rp_current_frame = frame;
+  s->current_frame = frame->number;
 
   /* If frame->win == NULL, then rp_current_screen is not updated. */
   rp_current_screen = s->screen_num;
 
   /* Possibly show the frame indicator. */
-  if ((old != s->rp_current_frame && num_frames(s) > 1)
+  if ((old != s->current_frame && num_frames(s) > 1)
       || s != old_s)
     {
       show_frame_indicator();
@@ -757,7 +833,7 @@ set_active_frame (rp_window_frame *frame)
 
   /* If the frame has no window to give focus to, give the key window
      focus. */
-  if( !frame->win )
+  if(frame->win_number == EMPTY)
     {
       XSetInputFocus (dpy, s->key_window,
 		      RevertToPointerRoot, CurrentTime);
@@ -767,10 +843,13 @@ set_active_frame (rp_window_frame *frame)
 void
 blank_frame (rp_window_frame *frame)
 {
-  if (frame->win == NULL) return;
+  rp_window *win;
+
+  if (frame->win_number == EMPTY) return;
 
-  hide_window (frame->win);
-  hide_others (frame->win);
+  win = find_window_number (frame->number);
+  hide_window (win);
+  hide_others (win);
 
   set_frames_window (frame, NULL);
 
@@ -797,18 +876,19 @@ show_frame_message (char *msg)
 {
   screen_info *s = current_screen ();
   int width, height;
+  rp_window_frame *frame;
+
+  frame = screen_get_frame (s, s->current_frame);
 
   width = defaults.bar_x_padding * 2 + XTextWidth (defaults.font, msg, strlen (msg));
   height = (FONT_HEIGHT (defaults.font) + defaults.bar_y_padding * 2);
 
-  XMoveResizeWindow (dpy, current_screen()->frame_window,
-		     current_screen()->rp_current_frame->x
-		     + current_screen()->rp_current_frame->width / 2 - width / 2,
-		     current_screen()->rp_current_frame->y
-		     + current_screen()->rp_current_frame->height / 2 - height / 2,
+  XMoveResizeWindow (dpy, s->frame_window,
+		     frame->x + frame->width / 2 - width / 2,
+		     frame->y + frame->height / 2 - height / 2,
 		     width, height);
 
-  XMapRaised (dpy, current_screen()->frame_window);
+  XMapRaised (dpy, s->frame_window);
   XClearWindow (dpy, s->frame_window);
   XSync (dpy, False);
 
diff --git a/src/window.c b/src/window.c
index 87ad967..a3042ab 100644
--- a/src/window.c
+++ b/src/window.c
@@ -178,7 +178,10 @@ find_window (Window w)
 void
 set_current_window (rp_window *win)
 {
-  set_frames_window (current_screen()->rp_current_frame, win);
+  rp_window_frame *frame;
+
+  frame = screen_get_frame (current_screen(), current_screen()->current_frame);
+  set_frames_window (frame, win);
 }
 
 rp_window *
@@ -475,10 +478,12 @@ void
 set_active_window (rp_window *win)
 {
   rp_window *last_win;
+  rp_window_frame *frame;
 
   if (win == NULL) return;
 
-  last_win = set_frames_window (win->scr->rp_current_frame, win);
+  frame = screen_get_frame (win->scr, win->scr->current_frame);
+  last_win = set_frames_window (frame, win);
 
   if (last_win) PRINT_DEBUG (("last window: %s\n", window_name (last_win)));
   PRINT_DEBUG (("new window: %s\n", window_name (win)));
@@ -683,3 +688,12 @@ free_window_stuff ()
 {
   numset_free (rp_window_numset);
 }
+
+rp_window_frame *
+win_get_frame (rp_window *win)
+{
+  if (win->frame_number != EMPTY)
+    return screen_get_frame (win->scr, win->frame_number);
+  else
+    return NULL;
+}
diff --git a/src/window.h b/src/window.h
index f15c26b..1ecf16b 100644
--- a/src/window.h
+++ b/src/window.h
@@ -63,4 +63,6 @@ void get_window_list (char *fmt, char *delim, struct sbuf *buffer,
 void init_window_stuff ();
 void free_window_stuff ();
 
+rp_window_frame *win_get_frame (rp_window *win);
+
 #endif /* ! _RATPOISON_LIST_H */