#| -*-Scheme-*-

Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
    2017, 2018, 2019, 2020 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

MIT/GNU Scheme 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 of the License, or (at
your option) any later version.

MIT/GNU Scheme 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 MIT/GNU Scheme; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

|#

;;;; Screen Commands

(declare (usual-integrations))

(define-command delete-frame
  "Delete the frame that point is in."
  ()
  (lambda ()
    (if (null? (cdr (screen-list)))
	(editor-error "Can't delete the only frame."))
    (delete-screen! (selected-screen))))

(define-command make-frame
  "Create a new frame, displaying the current buffer."
  ()
  (lambda () (select-buffer-other-screen (current-buffer))))

(define-command other-frame
  "Select the ARG'th different visible frame, and raise it.
All frames are arranged in a cyclic order.
This command selects the frame ARG steps away in that order.
A negative ARG moves in the opposite order."
  "p"
  (lambda (arg)
    (let ((screen (other-screen (selected-screen) arg)))
      (if (not screen)
	  (editor-error "No other visible frame."))
      (select-screen screen))))

(define-variable frame-name-format
  "If not false, template for displaying frame name.
Has same format as `mode-line-format'."
  'mode-line-buffer-identification)

(define-variable frame-name-length
  "Maximum length of frame name.
Used only if `frame-name-format' is non-false."
  64
  exact-nonnegative-integer?)

;; For upwards compatibility:
(define edwin-command$delete-screen edwin-command$delete-frame)
(define edwin-variable$x-screen-name-format edwin-variable$frame-name-format)
(define edwin-variable$x-screen-name-length edwin-variable$frame-name-length)