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/* Window creation, deletion and examination for GNU Emacs.
   Does not include redisplay.
   Copyright (C) 1985, 1986, 1987 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 1, 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
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 GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "config.h"
#include "lisp.h"
#include "buffer.h"
#include "screen.h"
#include "window.h"
#include "commands.h"
#include "indent.h"
#include "termchar.h"
#include "disptab.h"

Lisp_Object Qwindowp;

Lisp_Object Fnext_window (), Fdelete_window (), Fselect_window ();
Lisp_Object Fset_window_buffer (), Fsplit_window (), Frecenter ();

static void delete_all_subwindows ();
static struct window *decode_window();

/* This is the window in which the terminal's cursor should
   be left when nothing is being done with it.  This must
   always be a leaf window, and its buffer is selected by
   the top level editing loop at the end of each command.

   This value is always the same as
    SCREEN_SELECTED_WINDOW (selected_screen).  */

Lisp_Object selected_window;

#ifndef MULTI_SCREEN

/* The root window for the screen.
   This is accessed via SCREEN_ROOT_WINDOW (selected_screen).  */
Lisp_Object root_window;

#endif

/* The minibuffer window of the selected screen.
   Note that you cannot test for minibufferness of an arbitrary window
   by comparing against this; but you can test for minibufferness of
   the selected window.  */
Lisp_Object minibuf_window;

/* Non-nil means it is the window for C-M-v to scroll
   when the minibuffer is selected.  */
Lisp_Object Vminibuf_scroll_window;

/* Non-nil means this is the buffer whose window C-M-v should scroll.  */
Lisp_Object Vother_window_scroll_buffer;

/* Window that the mouse is over (nil if no mouse support).  */
Lisp_Object Vmouse_window;

/* Last mouse click data structure (nil if no mouse support).  */
Lisp_Object Vmouse_event;

/* Non-nil means it's function to call to display temp buffers.  */
Lisp_Object Vtemp_buffer_show_function;

/* If a window gets smaller than either of these, it is removed. */
int window_min_height;
int window_min_width;

/* Nonzero implies Fdisplay_buffer should create windows. */
int pop_up_windows;

/* Nonzero implies make new X screens for Fdisplay_buffer.  */
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int pop_up_screens;
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/* Non-nil means use this function instead of default */
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Lisp_Object Vpop_up_screen_function;
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/* Function to call to handle Fdisplay_buffer.  */
Lisp_Object Vdisplay_buffer_function;

/* Fdisplay_buffer always splits the largest window 
   if that window is more than this high.  */
int split_height_threshold;

/* Number of lines of continuity in scrolling by screenfuls.  */
int next_screen_context_lines;

/* Incremented for each window created.  */
static int sequence_number;

#define min(a, b) ((a) < (b) ? (a) : (b))

DEFUN ("windowp", Fwindowp, Swindowp, 1, 1, 0,
  "Returns t if OBJ is a window.")
  (obj)
     Lisp_Object obj;
{
  return XTYPE (obj) == Lisp_Window ? Qt : Qnil;
}

Lisp_Object
make_window ()
{
  register Lisp_Object val;
  register struct window *p;

  /* Add sizeof (Lisp_Object) here because sizeof (struct Lisp_Vector)
     includes the first element.  */
  val = Fmake_vector (
    make_number ((sizeof (struct window) - sizeof (struct Lisp_Vector)
		  + sizeof (Lisp_Object))
		 / sizeof (Lisp_Object)),
    Qnil);
  XSETTYPE (val, Lisp_Window);
  p = XWINDOW (val);
  XFASTINT (p->sequence_number) = ++sequence_number;
  XFASTINT (p->left) = XFASTINT (p->top)
    = XFASTINT (p->height) = XFASTINT (p->width)
      = XFASTINT (p->hscroll) = 0;
  XFASTINT (p->last_point_x) = XFASTINT (p->last_point_y) = 0;
  p->start = Fmake_marker ();
  p->pointm = Fmake_marker ();
  XFASTINT (p->use_time) = 0;
  p->screen = Qnil;
  p->display_table = Qnil;
  p->dedicated = Qnil;
  return val;
}

DEFUN ("selected-window", Fselected_window, Sselected_window, 0, 0, 0,
  "Return the window that the cursor now appears in and commands apply to.")
  ()
{
  return selected_window;
}

DEFUN ("minibuffer-window", Fminibuffer_window, Sminibuffer_window, 0, 0, 0,
  "Return the window used now for minibuffers.")
  ()
{
#ifdef MULTI_SCREEN
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  choose_minibuf_screen ();
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#endif /* MULTI_SCREEN */
  return minibuf_window;
}

DEFUN ("window-minibuffer-p", Fwindow_minibuffer_p, Swindow_minibuffer_p, 1, 1, 0,
  "Returns non-nil if WINDOW is a minibuffer window.")
  (window)
     Lisp_Object window;
{
  struct window *w = decode_window (window);
  return (MINI_WINDOW_P (w) ? Qt : Qnil);
}

DEFUN ("pos-visible-in-window-p", Fpos_visible_in_window_p,
  Spos_visible_in_window_p, 0, 2, 0,
  "Return t if position POS is currently on the screen in WINDOW.\n\
Returns nil if that position is scrolled vertically out of view.\n\
POS defaults to point; WINDOW, to the selected window.")
  (pos, window)
     Lisp_Object pos, window;
{
  register struct window *w;
  register int top;
  register int height;
  register int posint;
  register struct buffer *buf;
  struct position posval;

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  if (NILP (pos))
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    posint = point;
  else
    {
      CHECK_NUMBER_COERCE_MARKER (pos, 0);
      posint = XINT (pos);
    }

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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 1);
  w = XWINDOW (window);
  top = marker_position (w->start);

  if (posint < top)
    return Qnil;

  height = XFASTINT (w->height) - ! MINI_WINDOW_P (w);

  buf = XBUFFER (w->buffer);
  if (XFASTINT (w->last_modified) >= BUF_MODIFF (buf))
    {
      /* If screen is up to date,
	 use the info recorded about how much text fit on it. */
      if (posint < BUF_Z (buf) - XFASTINT (w->window_end_pos)
	  || (XFASTINT (w->window_end_vpos) < height))
	return Qt;
      return Qnil;
    }
  else
    {
      if (posint > BUF_Z (buf))
	return Qnil;

      /* If that info is not correct, calculate afresh */
      posval = *compute_motion (top, 0, 0, posint, height, 0,
				XFASTINT (w->width) - 1
				- (XFASTINT (w->width) + XFASTINT (w->left)
				   != XSCREEN (w->screen)->width),
				XINT (w->hscroll), 0);

      return posval.vpos < height ? Qt : Qnil;
    }
}

static struct window *
decode_window (window)
     register Lisp_Object window;
{
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  if (NILP (window))
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    return XWINDOW (selected_window);

  CHECK_WINDOW (window, 0);
  return XWINDOW (window);
}

DEFUN ("window-buffer", Fwindow_buffer, Swindow_buffer, 0, 1, 0,
  "Return the buffer that WINDOW is displaying.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->buffer;
}

DEFUN ("window-height", Fwindow_height, Swindow_height, 0, 1, 0,
  "Return the number of lines in WINDOW (including its mode line).")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->height;
}

DEFUN ("window-width", Fwindow_width, Swindow_width, 0, 1, 0,
  "Return the number of columns in WINDOW.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);
  register int width = w->width;

  /* If this window does not end at the right margin,
     must deduct one column for the border */
  if ((width + w->left) == SCREEN_WIDTH (XSCREEN (WINDOW_SCREEN (w))))
    return width;
  return width - 1;
}

DEFUN ("window-hscroll", Fwindow_hscroll, Swindow_hscroll, 0, 1, 0,
  "Return the number of columns by which WINDOW is scrolled from left margin.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->hscroll;
}

DEFUN ("set-window-hscroll", Fset_window_hscroll, Sset_window_hscroll, 2, 2, 0,
  "Set number of columns WINDOW is scrolled from left margin to NCOL.\n\
NCOL should be zero or positive.")
  (window, ncol)
     register Lisp_Object window, ncol;
{
  register struct window *w;

  CHECK_NUMBER (ncol, 1);
  if (XINT (ncol) < 0) XFASTINT (ncol) = 0;
  if (XFASTINT (ncol) >= (1 << (SHORTBITS - 1)))
    args_out_of_range (ncol, Qnil);
  w = decode_window (window);
  if (w->hscroll != ncol)
    clip_changed = 1;		/* Prevent redisplay shortcuts */
  w->hscroll = ncol;
  return ncol;
}

DEFUN ("window-edges", Fwindow_edges, Swindow_edges, 0, 1, 0,
  "Return a list of the edge coordinates of WINDOW.\n\
\(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of screen.\n\
RIGHT is one more than the rightmost column used by WINDOW,\n\
and BOTTOM is one more than the bottommost row used by WINDOW\n\
 and its mode-line.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);

  return Fcons (w->left, Fcons (w->top,
           Fcons (make_number (XFASTINT (w->left) + XFASTINT (w->width)),
		  Fcons (make_number (XFASTINT (w->top)
				      + XFASTINT (w->height)),
			 Qnil))));
}

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/* Test if the character at column *x, row *y is within window *w.
   If it is not, return 0;
   if it is in the window's text area,
      set *x and *y to its location relative to the upper left corner
         of the window, and
      return 1;
   if it is on the window's modeline, return 2;
   if it is on the border between the window and its right sibling,
      return 3.  */
static int
coordinates_in_window (w, x, y)
     register struct window *w;
     register int *x, *y;
{
  register int left = XINT (w->left);
  register int width = XINT (w->width);
  register int window_height = XINT (w->height);
  register int top = XFASTINT (w->top);

  if (   *x < left || *x >= left + width
      || *y < top  || *y >= top  + window_height)
    return 0;

  /* Is the character is the mode line?  */
  if (*y == top + window_height - 1
      && window_height > 1)	/* 1 line => minibuffer */
    return 2;
  
  /* Is the character in the right border?  */
  if (*x == left + width - 1
      && left + width != SCREEN_WIDTH (XSCREEN (w->screen)))
    return 3;

  *x -= left;
  *y -= top;
  return 1;
}

DEFUN ("coordinates-in-window-p", Fcoordinates_in_window_p,
  Scoordinates_in_window_p, 2, 2, 0,
  "Return non-nil if COORDINATES are in WINDOW.\n\
COORDINATES is a cons of the form (X . Y), X and Y being screen-relative.\n\
If COORDINATES are in the text portion of WINDOW,\n\
   the coordinates relative to the window are returned.\n\
If they are in the mode line of WINDOW, 'mode-line is returned.\n\
If they are on the border between WINDOW and its right sibling,\n\
   'vertical-split is returned.")
  (coordinates, window)
     register Lisp_Object coordinates, window;
{
  int x, y;

  CHECK_WINDOW (window, 0);
  CHECK_CONS (coordinates, 1);
  x = XINT (Fcar (coordinates));
  y = XINT (Fcdr (coordinates));

  switch (coordinates_in_window (XWINDOW (window), &x, &y))
    {
    case 0:			/* NOT in window at all. */
      return Qnil;

    case 1:			/* In text part of window. */
      return Fcons (x, y);

    case 2:			/* In mode line of window. */
      return Qmode_line;
      
    case 3:			/* On right border of window.  */
      return Qvertical_split;

    default:
      abort ();
    }
}

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/* Find the window containing column x, row y, and return it as a
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   Lisp_Object.  If x, y is on the window's modeline, set *part
   to 1; if it is on the separating line between the window and its
   right sibling, set it to 2; otherwise set it to 0.  If there is no
   window under x, y return nil and leave *part unmodified.  */
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Lisp_Object
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window_from_coordinates (screen, x, y, part)
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     SCREEN_PTR screen;
     int x, y;
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     int *part;
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{
  register Lisp_Object tem, first;

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  tem = first = SCREEN_SELECTED_WINDOW (screen);
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  do
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    {
      int found = coordinates_in_window (XWINDOW (tem), &x, &y);

      if (found)
	{
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	  *part = found - 1;
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	  return tem;
	}

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      tem = Fnext_window (tem, Qt, Qlambda);
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    }
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  while (! EQ (tem, first));
  
  return Qnil;
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}

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DEFUN ("window-at", Fwindow_at, Swindow_at, 1, 2, 0,
  "Return window containing position COORDINATES on SCREEN.\n\
If omitted, SCREEN defaults to the currently selected screen.\n\
COORDINATES is a pair (SCREEN-X . SCREEN-Y) of coordinates\n\
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which are relative to 0,0 at the top left corner of the screen.")
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  (coordinates, screen)
      Lisp_Object coordinates, screen;
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{
  int part;

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  if (NILP (screen))
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    XSET (screen, Lisp_Screen, selected_screen);
  else
    CHECK_LIVE_SCREEN (screen, 0);
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  CHECK_CONS (coordinates, 1);
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  CHECK_NUMBER (XCONS (coordinates)->car, 1);
  CHECK_NUMBER (XCONS (coordinates)->cdr, 1);
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  return window_from_coordinates (XSCREEN (screen),
				  XINT (Fcar (coordinates)),
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				  XINT (Fcdr (coordinates)),
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				  &part);
}

DEFUN ("window-point", Fwindow_point, Swindow_point, 0, 1, 0,
  "Return current value of point in WINDOW.\n\
For a nonselected window, this is the value point would have\n\
if that window were selected.\n\
\n\
Note that, when WINDOW is the selected window and its buffer\n\
is also currently selected, the value returned is the same as (point).\n\
It would be more strictly correct to return the `top-level' value\n\
of point, outside of any save-excursion forms.\n\
But that is hard to define.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);

  if (w == XWINDOW (selected_window)
      && current_buffer == XBUFFER (w->buffer))
    return Fpoint ();
  return Fmarker_position (w->pointm);
}

DEFUN ("window-start", Fwindow_start, Swindow_start, 0, 1, 0,
  "Return position at which display currently starts in WINDOW.")
  (window)
     Lisp_Object window;
{
  return Fmarker_position (decode_window (window)->start);
}

DEFUN ("window-end", Fwindow_end, Swindow_end, 0, 1, 0,
  "Return position at which display currently ends in WINDOW.")
  (window)
     Lisp_Object window;
{
  Lisp_Object value;
  struct window *w = decode_window (window);
  
  XSET (value, Lisp_Int,
	BUF_Z (current_buffer) - XFASTINT (w->window_end_pos));

  return value;
}

DEFUN ("set-window-point", Fset_window_point, Sset_window_point, 2, 2, 0,
  "Make point value in WINDOW be at position POS in WINDOW's buffer.")
  (window, pos)
     Lisp_Object window, pos;
{
  register struct window *w = decode_window (window);

  CHECK_NUMBER_COERCE_MARKER (pos, 1);
  if (w == XWINDOW (selected_window))
    Fgoto_char (pos);
  else
    set_marker_restricted (w->pointm, pos, w->buffer);

  return pos;
}

DEFUN ("set-window-start", Fset_window_start, Sset_window_start, 2, 3, 0,
  "Make display in WINDOW start at position POS in WINDOW's buffer.\n\
Optional third arg NOFORCE non-nil inhibits next redisplay\n\
from overriding motion of point in order to display at this exact start.")
  (window, pos, noforce)
     Lisp_Object window, pos, noforce;
{
  register struct window *w = decode_window (window);

  CHECK_NUMBER_COERCE_MARKER (pos, 1);
  set_marker_restricted (w->start, pos, w->buffer);
  /* this is not right, but much easier than doing what is right. */
  w->start_at_line_beg = Qnil;
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  if (NILP (noforce))
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    w->force_start = Qt;
  w->update_mode_line = Qt;
  XFASTINT (w->last_modified) = 0;
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  if (!EQ (window, selected_window))
    windows_or_buffers_changed++;
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  return pos;
}

DEFUN ("window-dedicated-p", Fwindow_dedicated_p, Swindow_dedicated_p,
       1, 1, 0,
  "Return WINDOW's dedicated object, usually t or nil.\n\
See also `set-window-buffer-dedicated'.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->dedicated;
}

DEFUN ("set-window-buffer-dedicated", Fset_window_buffer_dedicated,
       Sset_window_buffer_dedicated, 2, 2, 0,
  "Make WINDOW display BUFFER and be dedicated to that buffer.\n\
Then Emacs will not automatically change which buffer appears in WINDOW.\n\
If BUFFER is nil, make WINDOW not be dedicated (but don't change which\n\
buffer appears in it currently).")
  (window, arg)
       Lisp_Object window, arg;
{
  register struct window *w = decode_window (window);

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  if (NILP (arg))
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    w->dedicated = Qnil;
  else
    {
      Fset_window_buffer (window, Fget_buffer_create (arg));
      w->dedicated = Qt;
    }

  return w->dedicated;
}

DEFUN ("window-display-table", Fwindow_display_table, Swindow_display_table,
       0, 1, 0,
  "Return the display-table that WINDOW is using.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->display_table;
}

/* Get the display table for use currently on window W.
   This is either W's display table or W's buffer's display table.
   Ignore the specified tables if they are not valid;
   if no valid table is specified, return 0.  */

struct Lisp_Vector *
window_display_table (w)
     struct window *w;
{
  Lisp_Object tem;
  tem = w->display_table;
  if (XTYPE (tem) == Lisp_Vector && XVECTOR (tem)->size == DISP_TABLE_SIZE)
    return XVECTOR (tem);
  tem = XBUFFER (w->buffer)->display_table;
  if (XTYPE (tem) == Lisp_Vector && XVECTOR (tem)->size == DISP_TABLE_SIZE)
    return XVECTOR (tem);
  tem = Vstandard_display_table;
  if (XTYPE (tem) == Lisp_Vector && XVECTOR (tem)->size == DISP_TABLE_SIZE)
    return XVECTOR (tem);
  return 0;
}

DEFUN ("set-window-display-table",
       Fset_window_display_table, Sset_window_display_table, 2, 2, 0,
  "Set WINDOW's display-table to TABLE.")
  (window, table)
     register Lisp_Object window, table;
{
  register struct window *w;
  register Lisp_Object z;	/* Return value. */

  w = decode_window (window);
  w->display_table = table;
  return table;
}

/* Record info on buffer window w is displaying
   when it is about to cease to display that buffer.  */
static
unshow_buffer (w)
     register struct window *w;
{
  Lisp_Object buf = w->buffer;

  if (XBUFFER (buf) != XMARKER (w->pointm)->buffer)
    abort ();

  if (w == XWINDOW (selected_window)
      || ! EQ (buf, XWINDOW (selected_window)->buffer))
    /* Do this except when the selected window's buffer
       is being removed from some other window.  */
    XBUFFER (buf)->last_window_start = marker_position (w->start);

  /* Point in the selected window's buffer
     is actually stored in that buffer, and the window's pointm isn't used.
     So don't clobber point in that buffer.  */
  if (! EQ (buf, XWINDOW (selected_window)->buffer))
    BUF_PT (XBUFFER (buf))
      = clip_to_bounds (BUF_BEGV (XBUFFER (buf)),
			marker_position (w->pointm),
			BUF_ZV (XBUFFER (buf)));
}

/* Put replacement into the window structure in place of old. */
static
replace_window (old, replacement)
     Lisp_Object old, replacement;
{
  register Lisp_Object tem;
  register struct window *o = XWINDOW (old), *p = XWINDOW (replacement);

  /* If OLD is its screen's root_window, then replacement is the new
     root_window for that screen.  */

  if (old == XSCREEN (o->screen)->root_window)
    XSCREEN (o->screen)->root_window = replacement;

  p->left = o->left;
  p->top = o->top;
  p->width = o->width;
  p->height = o->height;

  p->next = tem = o->next;
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  if (!NILP (tem))
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    XWINDOW (tem)->prev = replacement;

  p->prev = tem = o->prev;
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  if (!NILP (tem))
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    XWINDOW (tem)->next = replacement;

  p->parent = tem = o->parent;
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  if (!NILP (tem))
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    {
      if (EQ (XWINDOW (tem)->vchild, old))
	XWINDOW (tem)->vchild = replacement;
      if (EQ (XWINDOW (tem)->hchild, old))
	XWINDOW (tem)->hchild = replacement;
    }

/*** Here, if replacement is a vertical combination
and so is its new parent, we should make replacement's
children be children of that parent instead.  ***/
}

DEFUN ("delete-window", Fdelete_window, Sdelete_window, 0, 1, "",
  "Remove WINDOW from the display.  Default is selected window.")
  (window)
     register Lisp_Object window;
{
  register Lisp_Object tem, parent, sib;
  register struct window *p;
  register struct window *par;

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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 0);

  p = XWINDOW (window);
  parent = p->parent;
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  if (NILP (parent))
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    error ("Attempt to delete minibuffer or sole ordinary window");
  par = XWINDOW (parent);

  windows_or_buffers_changed++;

  if (EQ (window, selected_window))
    Fselect_window (Fnext_window (window, Qnil, Qnil));

  tem = p->buffer;
  /* tem is null for dummy parent windows
     (which have inferiors but not any contents themselves) */
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  if (!NILP (tem))
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    {
      unshow_buffer (p);
      unchain_marker (p->pointm);
      unchain_marker (p->start);
      p->buffer = Qnil;
    }

  tem = p->next;
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  if (!NILP (tem))
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    XWINDOW (tem)->prev = p->prev;

  tem = p->prev;
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  if (!NILP (tem))
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    XWINDOW (tem)->next = p->next;

  if (EQ (window, par->hchild))
    par->hchild = p->next;
  if (EQ (window, par->vchild))
    par->vchild = p->next;

  /* Find one of our siblings to give our space to.  */
  sib = p->prev;
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  if (NILP (sib))
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    {
      /* If p gives its space to its next sibling, that sibling needs
	 to have its top/left side pulled back to where p's is.
	 set_window_{height,width} will re-position the sibling's
	 children.  */
      sib = p->next;
      XFASTINT (XWINDOW (sib)->top) = p->top;
      XFASTINT (XWINDOW (sib)->left) = p->left;
    }

  /* Stretch that sibling.  */
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  if (!NILP (par->vchild))
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    set_window_height (sib,
		       XFASTINT (XWINDOW (sib)->height) + XFASTINT (p->height),
		       1);
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  if (!NILP (par->hchild))
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    set_window_width (sib,
		      XFASTINT (XWINDOW (sib)->width) + XFASTINT (p->width),
		      1);

  /* If parent now has only one child,
     put the child into the parent's place.  */

  tem = par->hchild;
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  if (NILP (tem))
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    tem = par->vchild;
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  if (NILP (XWINDOW (tem)->next))
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    replace_window (parent, tem);
  return Qnil;
}


extern Lisp_Object next_screen (), prev_screen ();

DEFUN ("next-window", Fnext_window, Snext_window, 0, 3, 0,
  "Return next window after WINDOW in canonical ordering of windows.\n\
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If omitted, WINDOW defaults to the selected window.\n\
\n\
Optional second arg MINIBUF t means count the minibuffer window even\n\
if not active.  MINIBUF nil or omitted means count the minibuffer iff\n\
it is active.  MINIBUF neither t nor nil means not to count the\n\
minibuffer even if it is active.\n\
\n\
Several screens may share a single minibuffer; if the minibuffer\n\
counts, all windows on all screens that share that minibuffer count\n\
too.  This means that next-window may be used to iterate through the\n\
set of windows even when the minibuffer is on another screen.  If the\n\
minibuffer does not count, only windows from WINDOW's screen count.\n\
\n\
Optional third arg ALL-SCREENS t means include windows on all screens.\n\
ALL-SCREENS nil or omitted means cycle within the screens as specified\n\
above.  If neither nil nor t, restrict to WINDOW's screen.")
  (window, minibuf, all_screens)
     register Lisp_Object window, minibuf, all_screens;
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{
  register Lisp_Object tem;
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  Lisp_Object start_window;
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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 0);

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  start_window = window;

  /* minibuf == nil may or may not include minibuffers.
     Decide if it does.  */
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  if (NILP (minibuf))
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    minibuf = (minibuf_level ? Qt : Qlambda);

  /* all_screens == nil doesn't specify which screens to include.
     Decide which screens it includes.  */
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  if (NILP (all_screens))
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    all_screens = (EQ (minibuf, Qt)
		   ? (SCREEN_MINIBUF_WINDOW
		      (XSCREEN
		       (WINDOW_SCREEN
			(XWINDOW (window)))))
		   : Qnil);
  else if (! EQ (all_screens, Qt))
    all_screens = Qnil;
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  /* Do this loop at least once, to get the next window, and perhaps
     again, if we hit the minibuffer and that is not acceptable.  */
  do
    {
      /* Find a window that actually has a next one.  This loop
	 climbs up the tree.  */
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      while (tem = XWINDOW (window)->next, NILP (tem))
	if (tem = XWINDOW (window)->parent, !NILP (tem))
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	  window = tem;
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	else
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	  {
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	    /* We've reached the end of this screen.
	       Which other screens are acceptable?  */
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	    tem = WINDOW_SCREEN (XWINDOW (window));
#ifdef MULTI_SCREEN
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	    if (! NILP (all_screens))
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	      tem = next_screen (tem, all_screens);
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#endif
	    tem = SCREEN_ROOT_WINDOW (XSCREEN (tem));
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	    break;
	  }

      window = tem;
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      /* If we're in a combination window, find its first child and
	 recurse on that.  Otherwise, we've found the window we want.  */
      while (1)
	{
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	  if (!NILP (XWINDOW (window)->hchild))
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	    window = XWINDOW (window)->hchild;
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	  else if (!NILP (XWINDOW (window)->vchild))
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	    window = XWINDOW (window)->vchild;
	  else break;
	}
    }
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  /* Which windows are acceptible?
     Exit the loop and accept this window if
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     this isn't a minibuffer window, or
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     we're accepting minibuffer windows, or
     we've come all the way around and we're back at the original window.  */
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  while (MINI_WINDOW_P (XWINDOW (window))
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	 && ! EQ (minibuf, Qt)
	 && window != start_window);
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  return window;
}

DEFUN ("previous-window", Fprevious_window, Sprevious_window, 0, 3, 0,
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  "Return the window preceeding WINDOW in canonical ordering of windows.\n\
If omitted, WINDOW defaults to the selected window.\n\
\n\
Optional second arg MINIBUF t means count the minibuffer window even\n\
if not active.  MINIBUF nil or omitted means count the minibuffer iff\n\
it is active.  MINIBUF neither t nor nil means not to count the\n\
minibuffer even if it is active.\n\
\n\
Several screens may share a single minibuffer; if the minibuffer\n\
counts, all windows on all screens that share that minibuffer count\n\
too.  This means that previous-window may be used to iterate through\n\
the set of windows even when the minibuffer is on another screen.  If\n\
the minibuffer does not count, only windows from WINDOW's screen\n\
count.\n\
\n\
Optional third arg ALL-SCREENS t means include windows on all screens.\n\
ALL-SCREENS nil or omitted means cycle within the screens as specified\n\
above.  If neither nil nor t, restrict to WINDOW's screen.")
  (window, minibuf, all_screens)
     register Lisp_Object window, minibuf, all_screens;
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{
  register Lisp_Object tem;
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  Lisp_Object start_window;
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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 0);

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  start_window = window;

  /* minibuf == nil may or may not include minibuffers.
     Decide if it does.  */
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  if (NILP (minibuf))
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    minibuf = (minibuf_level ? Qt : Qlambda);

  /* all_screens == nil doesn't specify which screens to include.
     Decide which screens it includes.  */
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  if (NILP (all_screens))
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    all_screens = (EQ (minibuf, Qt)
		   ? (SCREEN_MINIBUF_WINDOW
		      (XSCREEN
		       (WINDOW_SCREEN
			(XWINDOW (window)))))
		   : Qnil);
  else if (! EQ (all_screens, Qt))
    all_screens = Qnil;
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  /* Do this loop at least once, to get the previous window, and perhaps
     again, if we hit the minibuffer and that is not acceptable.  */
  do
    {
      /* Find a window that actually has a previous one.  This loop
	 climbs up the tree.  */
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      while (tem = XWINDOW (window)->prev, NILP (tem))
	if (tem = XWINDOW (window)->parent, !NILP (tem))
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	  window = tem;
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	else
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	  {
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	    /* We have found the top window on the screen.
	       Which screens are acceptable?  */
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	    tem = WINDOW_SCREEN (XWINDOW (window));
#ifdef MULTI_SCREEN
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	    if (! NILP (all_screens))
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	      tem = next_screen (tem, all_screens);
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#endif
	    tem = SCREEN_ROOT_WINDOW (XSCREEN (tem));
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	    break;
	  }

      window = tem;
      /* If we're in a combination window, find its last child and
	 recurse on that.  Otherwise, we've found the window we want.  */
      while (1)
	{
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	  if (!NILP (XWINDOW (window)->hchild))
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	    window = XWINDOW (window)->hchild;
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	  else if (!NILP (XWINDOW (window)->vchild))
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	    window = XWINDOW (window)->vchild;
	  else break;
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	  while (tem = XWINDOW (window)->next, !NILP (tem))
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	    window = tem;
	}
    }
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  /* Which windows are acceptable?
     Exit the loop and accept this window if
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     this isn't a minibuffer window, or
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     we're accepting minibuffer windows, or
     we've come all the way around and we're back at the original window.  */
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  while (MINI_WINDOW_P (XWINDOW (window))
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	 && !EQ (minibuf, Qt)
	 && window != start_window);
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  return window;
}

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DEFUN ("other-window", Fother_window, Sother_window, 1, 2, "p",
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  "Select the ARG'th different window on this screen.\n\
All windows on current screen are arranged in a cyclic order.\n\
This command selects the window ARG steps away in that order.\n\
A negative ARG moves in the opposite order.  If the optional second\n\
argument ALL_SCREENS is non-nil, cycle through all screens.")
  (n, all_screens)
     register Lisp_Object n, all_screens;
{
  register int i;
  register Lisp_Object w;

  CHECK_NUMBER (n, 0);
  w = selected_window;
  i = XINT (n);

  while (i > 0)
    {
      w = Fnext_window (w, Qnil, all_screens);
      i--;
    }
  while (i < 0)
    {
      w = Fprevious_window (w, Qnil, all_screens);
      i++;
    }
  Fselect_window (w);
  return Qnil;
}

/* Look at all windows, performing an operation specified by TYPE
   with argument OBJ.
   If SCREENS is Qt, look at all screens, if Qnil, look at just the selected
   screen.  If SCREENS is a screen, just look at windows on that screen.
   If MINI is non-zero, perform the operation on minibuffer windows too.
*/

enum window_loop
{
  WINDOW_LOOP_UNUSED,
  GET_BUFFER_WINDOW,		/* Arg is buffer */
  GET_LRU_WINDOW,		/* Arg is t for full-width windows only */
  DELETE_OTHER_WINDOWS,		/* Arg is window not to delete */
  DELETE_BUFFER_WINDOWS,	/* Arg is buffer */
  GET_LARGEST_WINDOW,
  UNSHOW_BUFFER,		/* Arg is buffer */
};

static Lisp_Object
window_loop (type, obj, mini, screens)
     enum window_loop type;
     register Lisp_Object obj, screens;
     int mini;
{
  register Lisp_Object w;
  register Lisp_Object best_window;
  register Lisp_Object next_window;
  register Lisp_Object first_window;
  SCREEN_PTR screen;

  /* If we're only looping through windows on a particular screen,
     screen points to that screen.  If we're looping through windows
     on all screens, screen is 0.  */
  if (SCREENP (screens))
    screen = XSCREEN (screens);
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  else if (NILP (screens))
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    screen = selected_screen;
  else
    screen = 0;

  /* Pick a window to start with.  */
  if (XTYPE (obj) == Lisp_Window)
    first_window = obj;
  else if (screen)
    first_window = SCREEN_SELECTED_WINDOW (screen);
  else
    first_window = SCREEN_SELECTED_WINDOW (selected_screen);

  w = first_window;
  best_window = Qnil;
  do
    {
      /* Pick the next window now, since some operations will delete
	 the current window.  */
#ifdef MULTI_SCREEN
      if (screen)
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	next_window = Fnext_window (w, (mini ? Qt : Qnil), Qlambda);
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      else
#endif	/* MULTI_SCREEN */
	/* We know screen is 0, so we're looping through all screens.
	   Or we know this isn't a MULTI_SCREEN Emacs, so who cares?  */
	next_window = Fnext_window (w, mini ? Qt : Qnil, Qt);

      if (!MINI_WINDOW_P (XWINDOW (w))
	  || (mini && minibuf_level > 0))
	switch (type)
	  {
	  case GET_BUFFER_WINDOW:
#if 0
	    /* Ignore invisible and iconified screens.  */
	    if (! SCREEN_VISIBLE_P (XSCREEN (WINDOW_SCREEN (XWINDOW (w))))
		|| SCREEN_ICONIFIED_P (XSCREEN (WINDOW_SCREEN (XWINDOW (w)))))
	      break;
#endif
	    if (XBUFFER (XWINDOW (w)->buffer) == XBUFFER (obj))
	      return w;
	    break;

	  case GET_LRU_WINDOW:
	    /* t as arg means consider only full-width windows */
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	    if (!NILP (obj) && XFASTINT (XWINDOW (w)->width) != screen->width)
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	      break;
#if 0
	    /* Ignore invisible and iconified screens.  */
	    if (! SCREEN_VISIBLE_P (XSCREEN (WINDOW_SCREEN (XWINDOW (w))))
		|| SCREEN_ICONIFIED_P (XSCREEN (WINDOW_SCREEN (XWINDOW (w)))))
	      break;
#endif
	    /* Ignore dedicated windows and minibuffers.  */
	    if (MINI_WINDOW_P (XWINDOW (w))
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		|| !NILP (XWINDOW (w)->dedicated))
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	      break;
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	    if (NILP (best_window)
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		|| (XFASTINT (XWINDOW (best_window)->use_time)
		    > XFASTINT (XWINDOW (w)->use_time)))
	      best_window = w;
	    break;

	  case DELETE_OTHER_WINDOWS:
	    if (XWINDOW (w) != XWINDOW (obj))
	      Fdelete_window (w);
	    break;

	  case DELETE_BUFFER_WINDOWS:
	    if (EQ (XWINDOW (w)->buffer, obj))
	      {
		/* If we're deleting the buffer displayed in the only window
		   on the screen, find a new buffer to display there.  */
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		if (NILP (XWINDOW (w)->parent))
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		  {
		    Lisp_Object new_buffer = Fother_buffer (obj);
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		    if (NILP (new_buffer))
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		      new_buffer
			= Fget_buffer_create (build_string ("*scratch*"));
		    Fset_window_buffer (w, new_buffer);
		    Fset_buffer (XWINDOW (w)->buffer);
		  }
		else
		  Fdelete_window (w);
	      }
	    break;

	  case GET_LARGEST_WINDOW:
#if 0
	    /* Ignore invisible and iconified screens.  */
	    if (! SCREEN_VISIBLE_P (XSCREEN (WINDOW_SCREEN (XWINDOW (w))))
		|| SCREEN_ICONIFIED_P (XSCREEN (WINDOW_SCREEN (XWINDOW (w)))))
	      break;
#endif
	    /* Ignore dedicated windows and minibuffers.  */
	    if (MINI_WINDOW_P (XWINDOW (w))
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		|| !NILP (XWINDOW (w)->dedicated))
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	      break;
	    {
	      struct window *best_window_ptr = XWINDOW (best_window);
	      struct window *w_ptr = XWINDOW (w);
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	      if (NILP (best_window) ||
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		  (XFASTINT (w_ptr->height) * XFASTINT (w_ptr->width))
		  > (XFASTINT (best_window_ptr->height)
		     * XFASTINT (best_window_ptr->width)))
		best_window = w;
	    }
	    break;

	  case UNSHOW_BUFFER:
	    if (EQ (XWINDOW (w)->buffer, obj))
	      {
		/* Find another buffer to show in this window.  */
		Lisp_Object another_buffer = Fother_buffer (obj);
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		if (NILP (another_buffer))
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		  another_buffer
		    = Fget_buffer_create (build_string ("*scratch*"));
		Fset_window_buffer (w, another_buffer);
		if (EQ (w, selected_window))
		  Fset_buffer (XWINDOW (w)->buffer);
	      }
	    break;
	  }
      w = next_window;
    }
  while (! EQ (w, first_window));

  return best_window;
}     

DEFUN ("get-lru-window", Fget_lru_window, Sget_lru_window, 0, 1, 0,
  "Return the window least recently selected or used for display.\n\
If optional argument SCREENS is t, search all screens.  If SCREEN is a\n\
screen, search only that screen.\n")
  (screens)
    Lisp_Object screens;
{
  register Lisp_Object w;
  /* First try for a window that is full-width */
  w = window_loop (GET_LRU_WINDOW, Qt, 0, screens);
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  if (!NILP (w) && !EQ (w, selected_window))
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    return w;
  /* If none of them, try the rest */
  return window_loop (GET_LRU_WINDOW, Qnil, 0, screens);
}

DEFUN ("get-largest-window", Fget_largest_window, Sget_largest_window, 0, 1, 0,
  "Return the largest window in area.\n\
If optional argument SCREENS is t, search all screens.  If SCREEN is a\n\
screen, search only that screen.\n")
  (screen)
    Lisp_Object screen;
{
  return window_loop (GET_LARGEST_WINDOW, Qnil, 0,
		      screen);
}

DEFUN ("get-buffer-window", Fget_buffer_window, Sget_buffer_window, 1, 2, 0,
  "Return a window currently displaying BUFFER, or nil if none.\n\
If optional argument SCREENS is t, search all screens.  If SCREEN is a\n\
screen, search only that screen.\n")
  (buffer, screen)
    Lisp_Object buffer, screen;
{
  buffer = Fget_buffer (buffer);
  if (XTYPE (buffer) == Lisp_Buffer)
    return window_loop (GET_BUFFER_WINDOW, buffer, 1, screen);
  else
    return Qnil;
}

DEFUN ("delete-other-windows", Fdelete_other_windows, Sdelete_other_windows,
  0, 1, "",
  "Make WINDOW (or the selected window) fill its screen.\n\
Only the screen WINDOW is on is affected.")
  (window)
     Lisp_Object window;
{
  struct window *w;
  int opoint = point;
  struct buffer *obuf = current_buffer;
  int top;

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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 0);

  w = XWINDOW (window);
  top = XFASTINT (w->top);

  window_loop (DELETE_OTHER_WINDOWS, window, 0, WINDOW_SCREEN(w));

  Fset_buffer (w->buffer);
  SET_PT (marker_position (w->start));
  Frecenter (make_number (top));

  set_buffer_internal (obuf);
  SET_PT (opoint);
  return Qnil;
}

DEFUN ("delete-windows-on", Fdelete_windows_on, Sdelete_windows_on,
  1, 1, "bDelete windows on (buffer): ",
  "Delete all windows showing BUFFER.")
  (buffer)
     Lisp_Object buffer;
{
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  if (!NILP (buffer))
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    {
      buffer = Fget_buffer (buffer);
      CHECK_BUFFER (buffer, 0);
      window_loop (DELETE_BUFFER_WINDOWS, buffer, 0, Qt);
    }
  return Qnil;
}

DEFUN ("replace-buffer-in-windows", Freplace_buffer_in_windows,
  Sreplace_buffer_in_windows,
  1, 1, "bReplace buffer in windows: ",
  "Replace BUFFER with some other buffer in all windows showing it.")
  (buffer)
     Lisp_Object buffer;
{
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  if (!NILP (buffer))
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    {
      buffer = Fget_buffer (buffer);
      CHECK_BUFFER (buffer, 0);
      window_loop (UNSHOW_BUFFER, buffer, 0, Qt);
    }
  return Qnil;
}

/* Set the height of WINDOW and all its inferiors.  */
/* Normally the window is deleted if it gets too small.
   nodelete nonzero means do not do this.
   (The caller should check later and do so if appropriate)  */

set_window_height (window, height, nodelete)
     Lisp_Object window;
     int height;
     int nodelete;
{
  register struct window *w = XWINDOW (window);
  register struct window *c;
  int oheight = XFASTINT (w->height);
  int top, pos, lastbot, opos, lastobot;
  Lisp_Object child;

  if (!nodelete
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      && ! NILP (w->parent)
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      && height < window_min_height)
    {
      Fdelete_window (window);
      return;
    }

  XFASTINT (w->last_modified) = 0;
  windows_or_buffers_changed++;
  XFASTINT (w->height) = height;
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  if (!NILP (w->hchild))
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    {
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      for (child = w->hchild; !NILP (child); child = XWINDOW (child)->next)
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	{
	  XWINDOW (child)->top = w->top;
	  set_window_height (child, height, nodelete);
	}
    }
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  else if (!NILP (w->vchild))
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    {
      lastbot = top = XFASTINT (w->top);
      lastobot = 0;
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      for (child = w->vchild; !NILP (child); child = c->next)
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	{
	  c = XWINDOW (child);

	  opos = lastobot + XFASTINT (c->height);

	  XFASTINT (c->top) = lastbot;

	  pos = (((opos * height) << 1) + oheight) / (oheight << 1);

	  /* Avoid confusion: inhibit deletion of child if becomes too small */
	  set_window_height (child, pos + top - lastbot, 1);

	  /* Now advance child to next window,
	     and set lastbot if child was not just deleted.  */
	  lastbot = pos + top;
	  lastobot = opos;
	}
      /* Now delete any children that became too small.  */
      if (!nodelete)
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	for (child = w->vchild; !NILP (child); child = XWINDOW (child)->next)
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	  {
	    set_window_height (child, XINT (XWINDOW (child)->height), 0);
	  }
    }
}

/* Recursively set width of WINDOW and its inferiors. */

set_window_width (window, width, nodelete)
     Lisp_Object window;
     int width;
     int nodelete;
{
  register struct window *w = XWINDOW (window);
  register struct window *c;
  int owidth = XFASTINT (w->width);
  int left, pos, lastright, opos, lastoright;
  Lisp_Object child;

  if (!nodelete && width < window_min_width)
    {
      Fdelete_window (window);
      return;
    }

  XFASTINT (w->last_modified) = 0;
  windows_or_buffers_changed++;
  XFASTINT (w->width) = width;
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  if (!NILP (w->vchild))
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    {
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      for (child = w->vchild; !NILP (child); child = XWINDOW (child)->next)
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	{
	  XWINDOW (child)->left = w->left;
	  set_window_width (child, width, nodelete);
	}
    }
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  else if (!NILP (w->hchild))
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    {
      lastright = left = XFASTINT (w->left);
      lastoright = 0;
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      for (child = w->hchild; !NILP (child); child = c->next)
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	{
	  c = XWINDOW (child);

	  opos = lastoright + XFASTINT (c->width);

	  XFASTINT (c->left) = lastright;

	  pos = (((opos * width) << 1) + owidth) / (owidth << 1);

	  /* Inhibit deletion for becoming too small */
	  set_window_width (child, pos + left - lastright, 1);

	  /* Now advance child to next window,
	     and set lastright if child was not just deleted.  */
	  lastright = pos + left, lastoright = opos;
	}
      /* Delete children that became too small */
      if (!nodelete)
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	for (child = w->hchild; !NILP (child); child = XWINDOW (child)->next)
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	  {
	    set_window_width (child, XINT (XWINDOW (child)->width), 0);
	  }
    }
}

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int window_select_count;
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DEFUN ("set-window-buffer", Fset_window_buffer, Sset_window_buffer, 2, 2, 0,
  "Make WINDOW display BUFFER as its contents.\n\
BUFFER can be a buffer or buffer name.")
  (window, buffer)
     register Lisp_Object window, buffer;
{
  register Lisp_Object tem;
  register struct window *w = decode_window (window);

  buffer = Fget_buffer (buffer);
  CHECK_BUFFER (buffer, 1);

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  if (NILP (XBUFFER (buffer)->name))
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    error ("Attempt to display deleted buffer");

  tem = w->buffer;
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  if (NILP (tem))
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    error ("Window is deleted");
  else if (! EQ (tem, Qt))	/* w->buffer is t when the window
				   is first being set up.  */
    {
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      if (!NILP (w->dedicated) && !EQ (tem, buffer))
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	error ("Window is dedicated to %s\n", tem);

      unshow_buffer (w);
    }

  w->buffer = buffer;
  Fset_marker (w->pointm,
	       make_number (BUF_PT (XBUFFER (buffer))),
	       buffer);
  set_marker_restricted (w->start,
			 make_number (XBUFFER (buffer)->last_window_start),
			 buffer);
  w->start_at_line_beg = Qnil;
  XFASTINT (w->last_modified) = 0;
  windows_or_buffers_changed++;
  if (EQ (window, selected_window))
    Fset_buffer (buffer);

  return Qnil;
}

DEFUN ("select-window", Fselect_window, Sselect_window, 1, 1, 0,
  "Select WINDOW.  Most editing will apply to WINDOW's buffer.\n\
The main editor command loop selects the buffer of the selected window\n\
before each command.")
  (window)
     register Lisp_Object window;
{
  register struct window *w;
  register struct window *ow = XWINDOW (selected_window);

  CHECK_WINDOW (window, 0);

  w = XWINDOW (window);

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  if (NILP (w->buffer))
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    error ("Trying to select deleted window or non-leaf window");

  XFASTINT (w->use_time) = ++window_select_count;
  if (EQ (window, selected_window))
    return window;

  Fset_marker (ow->pointm, make_number (BUF_PT (XBUFFER (ow->buffer))),
	       ow->buffer);

  selected_window = window;
#ifdef MULTI_SCREEN
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  if (XSCREEN (WINDOW_SCREEN (w)) != selected_screen)
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    {
      XSCREEN (WINDOW_SCREEN (w))->selected_window = window;
      Fselect_screen (WINDOW_SCREEN (w), Qnil);
    }
  else
    selected_screen->selected_window = window;
#endif

  record_buffer (w->buffer);
  Fset_buffer (w->buffer);

  /* Go to the point recorded in the window.
     This is important when the buffer is in more
     than one window.  It also matters when
     redisplay_window has altered point after scrolling,
     because it makes the change only in the window.  */
  {
    register int new_point = marker_position (w->pointm);
    if (new_point < BEGV)
      SET_PT (BEGV);
    if (new_point > ZV)
      SET_PT (ZV);
    else
      SET_PT (new_point);
  }

  windows_or_buffers_changed++;
  return window;
}

DEFUN ("display-buffer", Fdisplay_buffer, Sdisplay_buffer, 1, 2, 0,
  "Make BUFFER appear in some window but don't select it.\n\
BUFFER can be a buffer or a buffer name.\n\
If BUFFER is shown already in some window, just use that one,\n\
unless the window is the selected window and the optional second\n\
argument NOT_THIS_WINDOW is non-nil.\n\
Returns the window displaying BUFFER.")
  (buffer, not_this_window)
     register Lisp_Object buffer, not_this_window;
{
  register Lisp_Object window;

  buffer = Fget_buffer (buffer);
  CHECK_BUFFER (buffer, 0);

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  if (!NILP (Vdisplay_buffer_function))
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    return call2 (Vdisplay_buffer_function, buffer, not_this_window);

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  if (NILP (not_this_window)
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      && XBUFFER (XWINDOW (selected_window)->buffer) == XBUFFER (buffer))
    return selected_window;

  window = Fget_buffer_window (buffer, Qnil);
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  if (!NILP (window)
      && (NILP (not_this_window) || !EQ (window, selected_window)))
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    return window;

#ifdef MULTI_SCREEN
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  /* If there are no screens open that have more than a minibuffer,
     we need to create a new screen.  */
  if (pop_up_screens || last_nonminibuf_screen == 0)
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    {
      window
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	= Fscreen_selected_window (call0 (Vpop_up_screen_function));
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      Fset_window_buffer (window, buffer);
#if 0
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      Fselect_screen (XWINDOW (window)->screen, Qnil);
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#endif
      return window;
    }
#endif /* MULTI_SCREEN */

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  if (pop_up_windows
#ifdef MULTI_SCREEN
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      || SCREEN_MINIBUF_ONLY_P (selected_screen)
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#endif
      )
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    {
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      Lisp_Object screens = Qnil;
      
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#ifdef MULTI_SCREEN
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      if (SCREEN_MINIBUF_ONLY_P (selected_screen))
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	XSET (screens, Lisp_Screen, last_nonminibuf_screen);
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#endif
      /* Don't try to create a window if would get an error */
      if (split_height_threshold < window_min_height << 1)
	split_height_threshold = window_min_height << 1;

      window = Fget_largest_window (screens);

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      if (!NILP (window)
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	  && window_height (window) >= split_height_threshold
	  &&
	  (XFASTINT (XWINDOW (window)->width)
	   == SCREEN_WIDTH (XSCREEN (WINDOW_SCREEN (XWINDOW (window))))))
	window = Fsplit_window (window, Qnil, Qnil);
      else
	{
	  window = Fget_lru_window (screens);
	  if ((EQ (window, selected_window)
	       || EQ (XWINDOW (window)->parent, Qnil))
	      && window_height (window) >= window_min_height << 1)
	    window = Fsplit_window (window, Qnil, Qnil);
	}
    }
  else
    window = Fget_lru_window (Qnil);

  Fset_window_buffer (window, buffer);
  return window;
}

void
temp_output_buffer_show (buf)
     register Lisp_Object buf;
{
  register struct buffer *old = current_buffer;
  register Lisp_Object window;
  register struct window *w;

  Fset_buffer (buf);
  XBUFFER (buf)->save_modified = MODIFF;
  BEGV = BEG;
  ZV = Z;
  SET_PT (BEG);
  clip_changed = 1;
  set_buffer_internal (old);

  if (!EQ (Vtemp_buffer_show_function, Qnil))
    call1 (Vtemp_buffer_show_function, buf);
  else
    {
      window = Fdisplay_buffer (buf, Qnil);

#ifdef MULTI_SCREEN
      if (XSCREEN (XWINDOW (window)->screen) != selected_screen)
	Fmake_screen_visible (XWINDOW (window)->screen);
#endif /* MULTI_SCREEN */
      Vminibuf_scroll_window = window;
      w = XWINDOW (window);
      XFASTINT (w->hscroll) = 0;
      set_marker_restricted (w->start, make_number (1), buf);
      set_marker_restricted (w->pointm, make_number (1), buf);
    }
}

static
make_dummy_parent (window)
     Lisp_Object window;
{
  register Lisp_Object old, new;
  register struct window *o, *p;

  old = window;
  XSETTYPE (old, Lisp_Vector);
  new = Fcopy_sequence (old);
  XSETTYPE (new, Lisp_Window);

  o = XWINDOW (old);
  p = XWINDOW (new);
  XFASTINT (p->sequence_number) = ++sequence_number;

  /* Put new into window structure in place of window */
  replace_window (window, new);

  o->next = Qnil;
  o->prev = Qnil;
  o->vchild = Qnil;
  o->hchild = Qnil;
  o->parent = new;

  p->start = Qnil;
  p->pointm = Qnil;
  p->buffer = Qnil;
}

DEFUN ("split-window", Fsplit_window, Ssplit_window, 0, 3, "",
  "Split WINDOW, putting SIZE lines in the first of the pair.\n\
WINDOW defaults to selected one and SIZE to half its size.\n\
If optional third arg HOR-FLAG is non-nil, split side by side\n\
and put SIZE columns in the first of the pair.")
  (window, chsize, horflag)
     Lisp_Object window, chsize, horflag;
{
  register Lisp_Object new;
  register struct window *o, *p;
  register int size;

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  if (NILP (window))
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    window = selected_window;
  else
    CHECK_WINDOW (window, 0);

  o = XWINDOW (window);

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  if (NILP (chsize))
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    {
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      if (!NILP (horflag))
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	/* Round odd size up, since this is for the left-hand window,
	   and it will lose a column for the separators.  */
	size = ((XFASTINT (o->width) + 1) & -2) >> 1;
      else
	size = XFASTINT (o->height) >> 1;
    }
  else
    {
      CHECK_NUMBER (chsize, 1);
      size = XINT (chsize);
    }

  if (MINI_WINDOW_P (o))
    error ("Attempt to split minibuffer window");
  else if (SCREEN_NO_SPLIT_P (XSCREEN (WINDOW_SCREEN (o))))
    error ("Attempt to split unsplittable screen");

  /* Smaller values might permit a crash.  */
  if (window_min_width < 2)
    window_min_width = 2;
  if (window_min_height < 2)
    window_min_height = 2;

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  if (NILP (horflag))
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    {
      if (size < window_min_height
	  || size + window_min_height > XFASTINT (o->height))
	args_out_of_range_3 (window, chsize, horflag);
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      if (NILP (o->parent)
	  || NILP (XWINDOW (o->parent)->vchild))
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	{
	  make_dummy_parent (window);
	  new = o->parent;
	  XWINDOW (new)->vchild = window;
	}
    }
  else
    {
      if (size < window_min_width
	  || size + window_min_width > XFASTINT (o->width))
	args_out_of_range_3 (window, chsize, horflag);
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      if (NILP (o->parent)
	  || NILP (XWINDOW (o->parent)->hchild))
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	{
	  make_dummy_parent (window);
	  new = o->parent;
	  XWINDOW (new)->hchild = window;
	}
    }

  /* Now we know that window's parent is a vertical combination
     if we are dividing vertically, or a horizontal combination
     if we are making side-by-side windows */

  windows_or_buffers_changed++;
  new = make_window ();
  p = XWINDOW (new);

  p->screen = o->screen;
  p->next = o->next;
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  if (!NILP (p->next))
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    XWINDOW (p->next)->prev = new;
  p->prev = window;
  o->next = new;
  p->parent = o->parent;
  p->buffer = Qt;

  Fset_window_buffer (new, o->buffer);

  /* Apportion the available screen space among the two new windows */

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  if (!NILP (horflag))
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    {
      p->height = o->height;
      p->top = o->top;
      XFASTINT (p->width) = XFASTINT (o->width) - size;
      XFASTINT (o->width) = size;
      XFASTINT (p->left) = XFASTINT (o->left) + size;
    }
  else
    {
      p->left = o->left;
      p->width = o->width;
      XFASTINT (p->height) = XFASTINT (o->height) - size;
      XFASTINT (o->height) = size;
      XFASTINT (p->top) = XFASTINT (o->top) + size;
    }

  return new;
}

DEFUN ("enlarge-window", Fenlarge_window, Senlarge_window, 1, 2, "p",
  "Make current window ARG lines bigger.\n\
From program, optional second arg non-nil means grow sideways ARG columns.")
  (n, side)
     register Lisp_Object n, side;
{
  CHECK_NUMBER (n, 0);
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  change_window_height (XINT (n), !NILP (side));
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  return Qnil;
}

DEFUN ("shrink-window", Fshrink_window, Sshrink_window, 1, 2, "p",
  "Make current window ARG lines smaller.\n\
From program, optional second arg non-nil means shrink sideways ARG columns.")
  (n, side)
     register Lisp_Object n, side;
{
  CHECK_NUMBER (n, 0);
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  change_window_height (-XINT (n), !NILP (side));
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  return Qnil;
}

int
window_height (window)
     Lisp_Object window;
{
  register struct window *p = XWINDOW (window);
  return XFASTINT (p->height);
}

int
window_width (window)
     Lisp_Object window;
{
  register struct window *p = XWINDOW (window);
  return XFASTINT (p->width);
}

#define MINSIZE(w) \
  (widthflag ? window_min_width : window_min_height)

#define CURBEG(w) \
  *(widthflag ? (int *) &(w)->left : (int *) &(w)->top)

#define CURSIZE(w) \
  *(widthflag ? (int *) &(w)->width : (int *) &(w)->height)

/* Unlike set_window_height, this function
   also changes the heights of the siblings so as to
   keep everything consistent. */

change_window_height (delta, widthflag)
     register int delta;
     int widthflag;
{
  register Lisp_Object parent;
  Lisp_Object window;
  register struct window *p;
  int *sizep;
  int (*sizefun) () = widthflag ? window_width : window_height;
  register int (*setsizefun) () = (widthflag
				   ? set_window_width
				   : set_window_height);

  /* Smaller values might permit a crash.  */
  if (window_min_width < 2)
    window_min_width = 2;
  if (window_min_height < 2)
    window_min_height = 2;

  window = selected_window;
  while (1)
    {
      p = XWINDOW (window);
      parent = p->parent;
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      if (NILP (parent))
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	{
	  if (widthflag)
	    error ("No other window to side of this one");
	  break;
	}
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      if (widthflag ? !NILP (XWINDOW (parent)->hchild)
	  : !NILP (XWINDOW (parent)->vchild))
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	break;
      window = parent;
    }

  sizep = &CURSIZE (p);

  if (*sizep + delta < MINSIZE (p)
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      && !NILP (XWINDOW (window)->parent))
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    {
      Fdelete_window (window);
      return;
    }

  {
    register int maxdelta;

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    maxdelta = (!NILP (parent) ? (*sizefun) (parent) - *sizep
		: !NILP (p->next) ? (*sizefun) (p->next) - MINSIZE (p->next)
		: !NILP (p->prev) ? (*sizefun) (p->prev) - MINSIZE (p->prev)
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		/* This is a screen with only one window, a minibuffer-only
		   or a minibufferless screen.  */
		: (delta = 0));
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    if (delta > maxdelta)
      /* This case traps trying to make the minibuffer
	 the full screen, or make the only window aside from the
	 minibuffer the full screen.  */
      delta = maxdelta;
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    if (delta == 0)
      return;
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  }

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  if (!NILP (p->next) &&
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      (*sizefun) (p->next) - delta >= MINSIZE (p->next))
    {
      (*setsizefun) (p->next, (*sizefun) (p->next) - delta, 0);
      (*setsizefun) (window, *sizep + delta, 0);
      CURBEG (XWINDOW (p->next)) += delta;
      /* This does not change size of p->next,
	 but it propagates the new top edge to its children */
      (*setsizefun) (p->next, (*sizefun) (p->next), 0);
    }
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  else if (!NILP (p->prev) &&
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	   (*sizefun) (p->prev) - delta >= MINSIZE (p->prev))
    {
      (*setsizefun) (p->prev, (*sizefun) (p->prev) - delta, 0);
      CURBEG (p) -= delta;
      (*setsizefun) (window, *sizep + delta, 0);
    }
  else
    {
      register int delta1;
      register int opht = (*sizefun) (parent);

      /* If trying to grow this window to or beyond size of the parent,
	 make delta1 so big that, on shrinking back down,
	 all the siblings end up with less than one line and are deleted.  */
      if (opht <= *sizep + delta)
	delta1 = opht * opht * 2;
      /* Otherwise, make delta1 just right so that if we add delta1
	 lines to this window and to the parent, and then shrink
	 the parent back to its original size, the new proportional
	 size of this window will increase by delta.  */
      else
	delta1 = (delta * opht * 100) / ((opht - *sizep - delta) * 100);

      /* Add delta1 lines or columns to this window, and to the parent,
	 keeping things consistent while not affecting siblings.  */
      CURSIZE (XWINDOW (parent)) = opht + delta1;
      (*setsizefun) (window, *sizep + delta1, 0);

      /* Squeeze out delta1 lines or columns from our parent,
	 shriking this window and siblings proportionately.
	 This brings parent back to correct size.
	 Delta1 was calculated so this makes this window the desired size,
	 taking it all out of the siblings.  */
      (*setsizefun) (parent, opht, 0);
    }

  XFASTINT (p->last_modified) = 0;
}
#undef MINSIZE
#undef CURBEG
#undef CURSIZE


/* Return number of lines of text (not counting mode line) in W.  */

int
window_internal_height (w)
     struct window *w;
{
  int ht = XFASTINT (w->height);

  if (MINI_WINDOW_P (w))
    return ht;

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  if (!NILP (w->parent) || !NILP (w->vchild) || !NILP (w->hchild)
      || !NILP (w->next) || !NILP (w->prev)
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      || SCREEN_WANTS_MODELINE_P (XSCREEN (WINDOW_SCREEN (w))))
    return ht - 1;

  return ht;
}

/* Scroll contents of window WINDOW up N lines.  */

void
window_scroll (window, n)
     Lisp_Object window;
     int n;
{
  register struct window *w = XWINDOW (window);
  register int opoint = point;
  register int pos;
  register int ht = window_internal_height (w);
  register Lisp_Object tem;
  int lose;
  Lisp_Object bolp, nmoved;

  XFASTINT (tem) = point;
  tem = Fpos_visible_in_window_p (tem, window);

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  if (NILP (tem))
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