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651 lines
23 KiB
EmacsLisp
651 lines
23 KiB
EmacsLisp
;;; desktop.el --- save partial status of Emacs when killed
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;; Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
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;; Author: Morten Welinder <terra@diku.dk>
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;; Keywords: customization
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;; Favourite-brand-of-beer: None, I hate beer.
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Save the Desktop, i.e.,
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;; - some global variables
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;; - the list of buffers with associated files. For each buffer also
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;; - the major mode
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;; - the default directory
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;; - the point
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;; - the mark & mark-active
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;; - buffer-read-only
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;; - some local variables
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;; To use this, first put these two lines in the bottom of your .emacs
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;; file (the later the better):
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;;
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;; (desktop-load-default)
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;; (desktop-read)
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;;
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;; Between the second and the third line you may wish to add something that
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;; updates the variables `desktop-globals-to-save' and/or
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;; `desktop-locals-to-save'. If for instance you want to save the local
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;; variable `foobar' for every buffer in which it is local, you could add
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;; the line
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;;
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;; (setq desktop-locals-to-save (cons 'foobar desktop-locals-to-save))
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;;
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;; To avoid saving excessive amounts of data you may also wish to add
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;; something like the following
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;;
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;; (add-hook 'kill-emacs-hook
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;; '(lambda ()
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;; (desktop-truncate search-ring 3)
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;; (desktop-truncate regexp-search-ring 3)))
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;;
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;; which will make sure that no more than three search items are saved. You
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;; must place this line *after* the (load "desktop") line. See also the
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;; variable desktop-save-hook.
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;; Start Emacs in the root directory of your "project". The desktop saver
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;; is inactive by default. You activate it by M-x desktop-save RET. When
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;; you exit the next time the above data will be saved. This ensures that
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;; all the files you were editing will be reloaded the next time you start
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;; Emacs from the same directory and that points will be set where you
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;; left them. If you save a desktop file in your home directory it will
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;; act as a default desktop when you start Emacs from a directory that
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;; doesn't have its own. I never do this, but you may want to.
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;; By the way: don't use desktop.el to customize Emacs -- the file .emacs
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;; in your home directory is used for that. Saving global default values
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;; for buffers is an example of misuse.
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;; PLEASE NOTE: The kill ring can be saved as specified by the variable
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;; `desktop-globals-to-save' (by default it isn't). This may result in saving
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;; things you did not mean to keep. Use M-x desktop-clear RET.
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;; Thanks to hetrick@phys.uva.nl (Jim Hetrick) for useful ideas.
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;; avk@rtsg.mot.com (Andrew V. Klein) for a dired tip.
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;; chris@tecc.co.uk (Chris Boucher) for a mark tip.
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;; f89-kam@nada.kth.se (Klas Mellbourn) for a mh-e tip.
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;; kifer@sbkifer.cs.sunysb.edu (M. Kifer) for a bug hunt.
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;; treese@lcs.mit.edu (Win Treese) for ange-ftp tips.
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;; pot@cnuce.cnr.it (Francesco Potorti`) for misc. tips.
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;; ---------------------------------------------------------------------------
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;; TODO:
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;;
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;; Save window configuration.
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;; Recognize more minor modes.
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;; Save mark rings.
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;; Start-up with buffer-menu???
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;;; Code:
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;; Make the compilation more silent
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(eval-when-compile
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;; We use functions from these modules
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;; We can't (require 'mh-e) since that wants to load something.
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(mapcar 'require '(info dired reporter)))
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;; ----------------------------------------------------------------------------
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;; USER OPTIONS -- settings you might want to play with.
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;; ----------------------------------------------------------------------------
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(defgroup desktop nil
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"Save status of Emacs when you exit."
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:group 'frames)
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(defcustom desktop-enable nil
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"*Non-nil enable Desktop to save the state of Emacs when you exit."
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:group 'desktop
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:type 'boolean
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:require 'desktop
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:initialize 'custom-initialize-default
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:version "20.3")
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(defcustom desktop-basefilename
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(convert-standard-filename ".emacs.desktop")
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"File for Emacs desktop, not including the directory name."
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:type 'file
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:group 'desktop)
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(defcustom desktop-missing-file-warning nil
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"*If non-nil then desktop warns when a file no longer exists.
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Otherwise it simply ignores that file."
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:type 'boolean
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:group 'desktop)
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(defvar desktop-globals-to-save
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(list 'desktop-missing-file-warning
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;; Feature: saving kill-ring implies saving kill-ring-yank-pointer
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;; 'kill-ring
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'tags-file-name
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'tags-table-list
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'search-ring
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'regexp-search-ring
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'register-alist
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;; 'desktop-globals-to-save ; Itself!
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)
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"List of global variables to save when killing Emacs.
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An element may be variable name (a symbol)
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or a cons cell of the form (VAR . MAX-SIZE),
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which means to truncate VAR's value to at most MAX-SIZE elements
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\(if the value is a list) before saving the value.")
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(defvar desktop-locals-to-save
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(list 'desktop-locals-to-save ; Itself! Think it over.
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'truncate-lines
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'case-fold-search
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'case-replace
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'fill-column
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'overwrite-mode
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'change-log-default-name
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'line-number-mode
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)
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"List of local variables to save for each buffer.
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The variables are saved only when they really are local.")
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(make-variable-buffer-local 'desktop-locals-to-save)
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;; We skip .log files because they are normally temporary.
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;; (ftp) files because they require passwords and whatnot.
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;; TAGS files to save time (tags-file-name is saved instead).
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(defcustom desktop-buffers-not-to-save
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"\\(^nn\\.a[0-9]+\\|\\.log\\|(ftp)\\|^tags\\|^TAGS\\)$"
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"Regexp identifying buffers that are to be excluded from saving."
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:type 'regexp
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:group 'desktop)
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;; Skip ange-ftp files
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(defcustom desktop-files-not-to-save
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"^/[^/:]*:"
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"Regexp identifying files whose buffers are to be excluded from saving."
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:type 'regexp
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:group 'desktop)
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(defcustom desktop-buffer-major-mode nil
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"When desktop creates a buffer, this holds the desired Major mode."
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:type 'symbol
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:group 'desktop)
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(defcustom desktop-buffer-file-name nil
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"When desktop creates a buffer, this holds the file name to visit."
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:type '(choice file (const nil))
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:group 'desktop)
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(defcustom desktop-buffer-name nil
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"When desktop creates a buffer, this holds the desired buffer name."
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:type '(choice string (const nil))
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:group 'desktop)
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(defvar desktop-buffer-misc nil
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"When desktop creates a buffer, this holds a list of misc info.
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It is used by the `desktop-buffer-handlers' functions.")
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(defcustom desktop-buffer-handlers
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'(desktop-buffer-dired
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desktop-buffer-rmail
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desktop-buffer-mh
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desktop-buffer-info
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desktop-buffer-file)
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"*List of functions to call in order to create a buffer.
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The functions are called without explicit parameters but can use the
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variables `desktop-buffer-major-mode', `desktop-buffer-file-name',
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`desktop-buffer-name'.
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If one function returns non-nil, no further functions are called.
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If the function returns t then the buffer is considered created."
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:type '(repeat function)
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:group 'desktop)
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(defvar desktop-create-buffer-form "(desktop-create-buffer 205"
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"Opening of form for creation of new buffers.")
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(defcustom desktop-save-hook nil
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"Hook run before desktop saves the state of Emacs.
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This is useful for truncating history lists, for example."
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:type 'hook
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:group 'desktop)
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;; ----------------------------------------------------------------------------
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(defvar desktop-dirname nil
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"The directory in which the current desktop file resides.")
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(defconst desktop-header
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";; --------------------------------------------------------------------------
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;; Desktop File for Emacs
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;; --------------------------------------------------------------------------
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" "*Header to place in Desktop file.")
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(defvar desktop-delay-hook nil
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"Hooks run after all buffers are loaded; intended for internal use.")
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;; ----------------------------------------------------------------------------
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(defun desktop-truncate (l n)
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"Truncate LIST to at most N elements destructively."
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(let ((here (nthcdr (1- n) l)))
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(if (consp here)
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(setcdr here nil))))
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;; ----------------------------------------------------------------------------
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(defcustom desktop-clear-preserve-buffers
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'("*scratch*" "*Messages*")
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"*Buffer names that `desktop-clear' should not delete."
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:type '(repeat string)
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:group 'desktop)
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(defun desktop-clear ()
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"Empty the Desktop.
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This kills all buffers except for internal ones
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and those listed in `desktop-clear-preserve-buffers'."
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(interactive)
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(setq kill-ring nil
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kill-ring-yank-pointer nil
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search-ring nil
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search-ring-yank-pointer nil
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regexp-search-ring nil
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regexp-search-ring-yank-pointer nil)
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(let ((buffers (buffer-list)))
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(while buffers
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(or (member (buffer-name (car buffers)) desktop-clear-preserve-buffers)
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(null (buffer-name (car buffers)))
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;; Don't kill buffers made for internal purposes.
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(and (not (equal (buffer-name (car buffers)) ""))
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(eq (aref (buffer-name (car buffers)) 0) ?\ ))
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(kill-buffer (car buffers)))
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(setq buffers (cdr buffers))))
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(delete-other-windows))
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;; ----------------------------------------------------------------------------
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(add-hook 'kill-emacs-hook 'desktop-kill)
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(defun desktop-kill ()
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(if desktop-dirname
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(condition-case err
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(desktop-save desktop-dirname)
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(file-error
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(if (yes-or-no-p "Error while saving the desktop. Quit anyway? ")
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nil
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(signal (car err) (cdr err)))))))
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;; ----------------------------------------------------------------------------
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(defun desktop-list* (&rest args)
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(if (null (cdr args))
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(car args)
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(setq args (nreverse args))
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(let ((value (cons (nth 1 args) (car args))))
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(setq args (cdr (cdr args)))
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(while args
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(setq value (cons (car args) value))
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(setq args (cdr args)))
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value)))
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(defun desktop-internal-v2s (val)
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"Convert VALUE to a pair (QUOTE . TXT); (eval (read TXT)) gives VALUE.
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TXT is a string that when read and evaluated yields value.
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QUOTE may be `may' (value may be quoted),
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`must' (values must be quoted), or nil (value may not be quoted)."
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(cond
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((or (numberp val) (null val) (eq t val))
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(cons 'may (prin1-to-string val)))
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((stringp val)
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(let ((copy (copy-sequence val)))
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(set-text-properties 0 (length copy) nil copy)
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;; Get rid of text properties because we cannot read them
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(cons 'may (prin1-to-string copy))))
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((symbolp val)
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(cons 'must (prin1-to-string val)))
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((vectorp val)
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(let* ((special nil)
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(pass1 (mapcar
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(lambda (el)
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(let ((res (desktop-internal-v2s el)))
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(if (null (car res))
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(setq special t))
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res))
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val)))
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(if special
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(cons nil (concat "(vector "
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(mapconcat (lambda (el)
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(if (eq (car el) 'must)
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(concat "'" (cdr el))
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(cdr el)))
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pass1
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" ")
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")"))
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(cons 'may (concat "[" (mapconcat 'cdr pass1 " ") "]")))))
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((consp val)
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(let ((p val)
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newlist
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use-list*
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anynil)
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(while (consp p)
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(let ((q.txt (desktop-internal-v2s (car p))))
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(or anynil (setq anynil (null (car q.txt))))
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(setq newlist (cons q.txt newlist)))
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(setq p (cdr p)))
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(if p
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(let ((last (desktop-internal-v2s p))
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(el (car newlist)))
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(or anynil (setq anynil (null (car last))))
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(or anynil
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(setq newlist (cons '(must . ".") newlist)))
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(setq use-list* t)
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(setq newlist (cons last newlist))))
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(setq newlist (nreverse newlist))
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(if anynil
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(cons nil
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(concat (if use-list* "(desktop-list* " "(list ")
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(mapconcat (lambda (el)
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(if (eq (car el) 'must)
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(concat "'" (cdr el))
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(cdr el)))
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newlist
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" ")
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")"))
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(cons 'must
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(concat "(" (mapconcat 'cdr newlist " ") ")")))))
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((subrp val)
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(cons nil (concat "(symbol-function '"
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(substring (prin1-to-string val) 7 -1)
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")")))
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((markerp val)
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(let ((pos (prin1-to-string (marker-position val)))
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(buf (prin1-to-string (buffer-name (marker-buffer val)))))
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(cons nil (concat "(let ((mk (make-marker)))"
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" (add-hook 'desktop-delay-hook"
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" (list 'lambda '() (list 'set-marker mk "
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pos " (get-buffer " buf ")))) mk)"))))
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(t ; save as text
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(cons 'may "\"Unprintable entity\""))))
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(defun desktop-value-to-string (val)
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"Convert VALUE to a string that when read evaluates to the same value.
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Not all types of values are supported."
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(let* ((print-escape-newlines t)
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(float-output-format nil)
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(quote.txt (desktop-internal-v2s val))
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(quote (car quote.txt))
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(txt (cdr quote.txt)))
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(if (eq quote 'must)
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(concat "'" txt)
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txt)))
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;; ----------------------------------------------------------------------------
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(defun desktop-outvar (varspec)
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"Output a setq statement for variable VAR to the desktop file.
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The argument VARSPEC may be the variable name VAR (a symbol),
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or a cons cell of the form (VAR . MAX-SIZE),
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which means to truncate VAR's value to at most MAX-SIZE elements
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\(if the value is a list) before saving the value."
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(let (var size)
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(if (consp varspec)
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(setq var (car varspec) size (cdr varspec))
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(setq var varspec))
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(if (boundp var)
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(progn
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(if (and (integerp size)
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(> size 0)
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(listp (eval var)))
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(desktop-truncate (eval var) size))
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(insert "(setq "
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(symbol-name var)
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" "
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(desktop-value-to-string (symbol-value var))
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")\n")))))
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;; ----------------------------------------------------------------------------
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(defun desktop-save-buffer-p (filename bufname mode &rest dummy)
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"Return t if the desktop should record a particular buffer for next startup.
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FILENAME is the visited file name, BUFNAME is the buffer name, and
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MODE is the major mode."
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(let ((case-fold-search nil))
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(or (and filename
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(not (string-match desktop-buffers-not-to-save bufname))
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(not (string-match desktop-files-not-to-save filename)))
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(and (eq mode 'dired-mode)
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(save-excursion
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(set-buffer (get-buffer bufname))
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(not (string-match desktop-files-not-to-save
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default-directory))))
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(and (null filename)
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(memq mode '(Info-mode rmail-mode))))))
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;; ----------------------------------------------------------------------------
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(defun desktop-save (dirname)
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"Save the Desktop file. Parameter DIRNAME specifies where to save desktop."
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(interactive "DDirectory to save desktop file in: ")
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(run-hooks 'desktop-save-hook)
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(save-excursion
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(let ((filename (expand-file-name
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(concat dirname desktop-basefilename)))
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(info (nreverse
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(mapcar
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(function (lambda (b)
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(set-buffer b)
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(list
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(buffer-file-name)
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(buffer-name)
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major-mode
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(list ; list explaining minor modes
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(not (null auto-fill-function)))
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(point)
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(list (mark t) mark-active)
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buffer-read-only
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(cond ((eq major-mode 'Info-mode)
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(list Info-current-file
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Info-current-node))
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((eq major-mode 'dired-mode)
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(cons
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(expand-file-name dired-directory)
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(cdr
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(nreverse
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(mapcar
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(function car)
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dired-subdir-alist))))))
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(let ((locals desktop-locals-to-save)
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(loclist (buffer-local-variables))
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(ll))
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(while locals
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(let ((here (assq (car locals) loclist)))
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(if here
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(setq ll (cons here ll))
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(if (member (car locals) loclist)
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(setq ll (cons (car locals) ll)))))
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(setq locals (cdr locals)))
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ll)
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)))
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(buffer-list))))
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(buf (get-buffer-create "*desktop*")))
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(set-buffer buf)
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(erase-buffer)
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(insert desktop-header
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";; Created " (current-time-string) "\n"
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";; Emacs version " emacs-version "\n\n"
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";; Global section:\n")
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(mapcar (function desktop-outvar) desktop-globals-to-save)
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(if (memq 'kill-ring desktop-globals-to-save)
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(insert "(setq kill-ring-yank-pointer (nthcdr "
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(int-to-string
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(- (length kill-ring) (length kill-ring-yank-pointer)))
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" kill-ring))\n"))
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(insert "\n;; Buffer section:\n")
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(mapcar
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(function (lambda (l)
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(if (apply 'desktop-save-buffer-p l)
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(progn
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(insert desktop-create-buffer-form)
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(mapcar
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(function (lambda (e)
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(insert "\n "
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(desktop-value-to-string e))))
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l)
|
|
(insert ")\n\n")))))
|
|
info)
|
|
(setq default-directory dirname)
|
|
(if (file-exists-p filename) (delete-file filename))
|
|
(write-region (point-min) (point-max) filename nil 'nomessage)))
|
|
(setq desktop-dirname dirname))
|
|
;; ----------------------------------------------------------------------------
|
|
(defun desktop-remove ()
|
|
"Delete the Desktop file and inactivate the desktop system."
|
|
(interactive)
|
|
(if desktop-dirname
|
|
(let ((filename (concat desktop-dirname desktop-basefilename)))
|
|
(setq desktop-dirname nil)
|
|
(if (file-exists-p filename)
|
|
(delete-file filename)))))
|
|
;; ----------------------------------------------------------------------------
|
|
;;;###autoload
|
|
(defun desktop-read ()
|
|
"Read the Desktop file and the files it specifies.
|
|
This is a no-op when Emacs is running in batch mode."
|
|
(interactive)
|
|
(if noninteractive
|
|
nil
|
|
(let ((dirs '("./" "~/")))
|
|
(while (and dirs
|
|
(not (file-exists-p (expand-file-name
|
|
desktop-basefilename
|
|
(car dirs)))))
|
|
(setq dirs (cdr dirs)))
|
|
(setq desktop-dirname (and dirs (expand-file-name (car dirs))))
|
|
(if desktop-dirname
|
|
(progn
|
|
(load (expand-file-name desktop-basefilename desktop-dirname)
|
|
t t t)
|
|
(run-hooks 'desktop-delay-hook)
|
|
(setq desktop-delay-hook nil)
|
|
(message "Desktop loaded."))
|
|
(desktop-clear)))))
|
|
;; ----------------------------------------------------------------------------
|
|
;;;###autoload
|
|
(defun desktop-load-default ()
|
|
"Load the `default' start-up library manually.
|
|
Also inhibit further loading of it. Call this from your `.emacs' file
|
|
to provide correct modes for autoloaded files."
|
|
(if (not inhibit-default-init) ; safety check
|
|
(progn
|
|
(load "default" t t)
|
|
(setq inhibit-default-init t))))
|
|
;; ----------------------------------------------------------------------------
|
|
;; Note: the following functions use the dynamic variable binding in Lisp.
|
|
;;
|
|
(defun desktop-buffer-info () "Load an info file."
|
|
(if (eq 'Info-mode desktop-buffer-major-mode)
|
|
(progn
|
|
(require 'info)
|
|
(Info-find-node (nth 0 desktop-buffer-misc) (nth 1 desktop-buffer-misc))
|
|
(current-buffer))))
|
|
;; ----------------------------------------------------------------------------
|
|
(defun desktop-buffer-rmail () "Load an RMAIL file."
|
|
(if (eq 'rmail-mode desktop-buffer-major-mode)
|
|
(condition-case error
|
|
(progn (rmail-input desktop-buffer-file-name)
|
|
(if (eq major-mode 'rmail-mode)
|
|
(current-buffer)
|
|
rmail-buffer))
|
|
(file-locked
|
|
(kill-buffer (current-buffer))
|
|
'ignored))))
|
|
;; ----------------------------------------------------------------------------
|
|
(defun desktop-buffer-mh () "Load a folder in the mh system."
|
|
(if (eq 'mh-folder-mode desktop-buffer-major-mode)
|
|
(progn
|
|
(require 'mh-e)
|
|
(mh-find-path)
|
|
(mh-visit-folder desktop-buffer-name)
|
|
(current-buffer))))
|
|
;; ----------------------------------------------------------------------------
|
|
(defun desktop-buffer-dired () "Load a directory using dired."
|
|
(if (eq 'dired-mode desktop-buffer-major-mode)
|
|
(if (file-directory-p (file-name-directory (car desktop-buffer-misc)))
|
|
(progn
|
|
(dired (car desktop-buffer-misc))
|
|
(mapcar 'dired-insert-subdir (cdr desktop-buffer-misc))
|
|
(current-buffer))
|
|
(message "Directory %s no longer exists." (car desktop-buffer-misc))
|
|
(sit-for 1)
|
|
'ignored)))
|
|
;; ----------------------------------------------------------------------------
|
|
(defun desktop-buffer-file () "Load a file."
|
|
(if desktop-buffer-file-name
|
|
(if (or (file-exists-p desktop-buffer-file-name)
|
|
(and desktop-missing-file-warning
|
|
(y-or-n-p (format
|
|
"File \"%s\" no longer exists. Re-create? "
|
|
desktop-buffer-file-name))))
|
|
(progn (find-file desktop-buffer-file-name) (current-buffer))
|
|
'ignored)))
|
|
;; ----------------------------------------------------------------------------
|
|
;; Create a buffer, load its file, set is mode, ...; called from Desktop file
|
|
;; only.
|
|
(defun desktop-create-buffer (ver desktop-buffer-file-name desktop-buffer-name
|
|
desktop-buffer-major-mode
|
|
mim pt mk ro desktop-buffer-misc &optional locals)
|
|
(let ((hlist desktop-buffer-handlers)
|
|
(result)
|
|
(handler))
|
|
(while (and (not result) hlist)
|
|
(setq handler (car hlist))
|
|
(setq result (funcall handler))
|
|
(setq hlist (cdr hlist)))
|
|
(when (bufferp result)
|
|
(set-buffer result)
|
|
(if (not (equal (buffer-name) desktop-buffer-name))
|
|
(rename-buffer desktop-buffer-name))
|
|
(auto-fill-mode (if (nth 0 mim) 1 0))
|
|
(goto-char pt)
|
|
(if (consp mk)
|
|
(progn
|
|
(set-mark (car mk))
|
|
(setq mark-active (car (cdr mk))))
|
|
(set-mark mk))
|
|
;; Never override file system if the file really is read-only marked.
|
|
(if ro (setq buffer-read-only ro))
|
|
(while locals
|
|
(let ((this (car locals)))
|
|
(if (consp this)
|
|
;; an entry of this form `(symbol . value)'
|
|
(progn
|
|
(make-local-variable (car this))
|
|
(set (car this) (cdr this)))
|
|
;; an entry of the form `symbol'
|
|
(make-local-variable this)
|
|
(makunbound this)))
|
|
(setq locals (cdr locals))))))
|
|
|
|
;; Backward compatibility -- update parameters to 205 standards.
|
|
(defun desktop-buffer (desktop-buffer-file-name desktop-buffer-name
|
|
desktop-buffer-major-mode
|
|
mim pt mk ro tl fc cfs cr desktop-buffer-misc)
|
|
(desktop-create-buffer 205 desktop-buffer-file-name desktop-buffer-name
|
|
desktop-buffer-major-mode (cdr mim) pt mk ro
|
|
desktop-buffer-misc
|
|
(list (cons 'truncate-lines tl)
|
|
(cons 'fill-column fc)
|
|
(cons 'case-fold-search cfs)
|
|
(cons 'case-replace cr)
|
|
(cons 'overwrite-mode (car mim)))))
|
|
;; ----------------------------------------------------------------------------
|
|
|
|
;; If the user set desktop-enable to t with Custom,
|
|
;; do the rest of what it takes to use desktop,
|
|
;; but do it after finishing loading the init file.
|
|
(add-hook 'after-init-hook
|
|
'(lambda ()
|
|
(when desktop-enable
|
|
(desktop-load-default)
|
|
(desktop-read))))
|
|
|
|
(provide 'desktop)
|
|
|
|
;; desktop.el ends here.
|