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1 ;;; desktop.el --- save partial status of Emacs when killed
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2
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3 ;; Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
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4
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5 ;; Author: Morten Welinder <terra@diku.dk>
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6 ;; Version: 2.09? RMS has an obnoxious tendency to remove version
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7 ;; numbers from packages, and he did in this case.
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8 ;; Keywords: customization
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9 ;; Favourite-brand-of-beer: None, I hate beer.
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10
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11 ;; This file is part of XEmacs.
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12
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13 ;; XEmacs is free software; you can redistribute it and/or modify it
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14 ;; under the terms of the GNU General Public License as published by
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15 ;; the Free Software Foundation; either version 2, or (at your option)
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16 ;; any later version.
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17
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18 ;; XEmacs is distributed in the hope that it will be useful, but
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19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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21 ;; General Public License for more details.
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22
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23 ;; You should have received a copy of the GNU General Public License
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24 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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25 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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26
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27 ;;; Synched up with: FSF 19.30.
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28
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29 ;;; Commentary:
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30
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31 ;; Save the Desktop, i.e.,
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32 ;; - some global variables
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33 ;; - the list of buffers with associated files. For each buffer also
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34 ;; - the major mode
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35 ;; - the default directory
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36 ;; - the point
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37 ;; - the mark & mark-active
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38 ;; - buffer-read-only
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39 ;; - some local variables
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40
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41 ;; To use this, first put these three lines in the bottom of your .emacs
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42 ;; file (the later the better):
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43 ;;
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44 ;; (load "desktop")
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45 ;; (desktop-load-default)
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46 ;; (desktop-read)
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47 ;;
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48 ;; Between the second and the third line you may wish to add something that
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49 ;; updates the variables `desktop-globals-to-save' and/or
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50 ;; `desktop-locals-to-save'. If for instance you want to save the local
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51 ;; variable `foobar' for every buffer in which it is local, you could add
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52 ;; the line
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53 ;;
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54 ;; (setq desktop-locals-to-save (cons 'foobar desktop-locals-to-save))
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55 ;;
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56 ;; To avoid saving excessive amounts of data you may also wish to add
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57 ;; something like the following
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58 ;;
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59 ;; (add-hook 'kill-emacs-hook
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60 ;; '(lambda ()
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61 ;; (desktop-truncate search-ring 3)
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62 ;; (desktop-truncate regexp-search-ring 3)))
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63 ;;
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64 ;; which will make sure that no more than three search items are saved. You
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65 ;; must place this line *after* the (load "desktop") line. See also the
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66 ;; variable desktop-save-hook.
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67
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68 ;; Start Emacs in the root directory of your "project". The desktop saver
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69 ;; is inactive by default. You activate it by M-x desktop-save RET. When
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70 ;; you exit the next time the above data will be saved. This ensures that
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71 ;; all the files you were editing will be reloaded the next time you start
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72 ;; Emacs from the same directory and that points will be set where you
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73 ;; left them. If you save a desktop file in your home directory it will
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74 ;; act as a default desktop when you start Emacs from a directory that
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75 ;; doesn't have its own. I never do this, but you may want to.
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76
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77 ;; By the way: don't use desktop.el to customize Emacs -- the file .emacs
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78 ;; in your home directory is used for that. Saving global default values
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79 ;; for buffers is an example of misuse.
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80
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81 ;; PLEASE NOTE: The kill ring can be saved as specified by the variable
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82 ;; `desktop-globals-to-save' (by default it isn't). This may result in saving
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83 ;; things you did not mean to keep. Use M-x desktop-clear RET.
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84
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85 ;; Thanks to hetrick@phys.uva.nl (Jim Hetrick) for useful ideas.
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86 ;; avk@rtsg.mot.com (Andrew V. Klein) for a dired tip.
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87 ;; chris@tecc.co.uk (Chris Boucher) for a mark tip.
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88 ;; f89-kam@nada.kth.se (Klas Mellbourn) for a mh-e tip.
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89 ;; kifer@sbkifer.cs.sunysb.edu (M. Kifer) for a bug hunt.
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90 ;; treese@lcs.mit.edu (Win Treese) for ange-ftp tips.
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91 ;; ---------------------------------------------------------------------------
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92 ;; TODO:
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93 ;;
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94 ;; Save window configuration.
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95 ;; Recognize more minor modes.
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96 ;; Save mark rings.
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97 ;; Start-up with buffer-menu???
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98
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99 ;;; Code:
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100
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101 ;; Make the compilation more silent
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102 (eval-when-compile
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103 ;; We use functions from these modules
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104 ;; We can't (require 'mh-e) since that wants to load something.
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105 (mapcar 'require '(info dired reporter)))
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106 ;; ----------------------------------------------------------------------------
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107 ;; USER OPTIONS -- settings you might want to play with.
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108 ;; ----------------------------------------------------------------------------
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109 (defconst desktop-basefilename
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110 (if (or (eq system-type 'ms-dos) (eq system-type 'windows-nt))
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111 "emacs.dsk" ; Ms-Dos does not support multiple dots in file name
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112 ".emacs.desktop")
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113 "File for Emacs desktop, not including the directory name.")
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114
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115 (defvar desktop-missing-file-warning t
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116 "*If non-nil then desktop warns when a file no longer exists.
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117 Otherwise it simply ignores that file.")
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118
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119 (defvar desktop-globals-to-save
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120 (list 'desktop-missing-file-warning
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121 ;; Feature: saving kill-ring implies saving kill-ring-yank-pointer
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122 ;; 'kill-ring
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123 'tags-file-name
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124 'tags-table-list
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125 'search-ring
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126 'regexp-search-ring
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127 'register-alist
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128 ;; 'desktop-globals-to-save ; Itself!
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129 )
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130 "List of global variables to save when killing Emacs.
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131 An element may be variable name (a symbol)
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132 or a cons cell of the form (VAR . MAX-SIZE),
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133 which means to truncate VAR's value to at most MAX-SIZE elements
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134 \(if the value is a list) before saving the value.")
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135
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136 (defvar desktop-locals-to-save
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137 (list 'desktop-locals-to-save ; Itself! Think it over.
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138 'truncate-lines
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139 'case-fold-search
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140 'case-replace
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141 'fill-column
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142 'overwrite-mode
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143 'change-log-default-name
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144 'line-number-mode
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145 )
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146 "List of local variables to save for each buffer.
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147 The variables are saved only when they really are local.")
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148 (make-variable-buffer-local 'desktop-locals-to-save)
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149
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150 ;; We skip .log files because they are normally temporary.
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151 ;; (ftp) files because they require passwords and whatsnot.
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152 ;; TAGS files to save time (tags-file-name is saved instead).
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153 (defvar desktop-buffers-not-to-save
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154 "\\(^nn\\.a[0-9]+\\|\\.log\\|(ftp)\\|^tags\\|^TAGS\\)$"
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155 "Regexp identifying buffers that are to be excluded from saving.")
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156
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157 ;; Skip ange-ftp files
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158 (defvar desktop-files-not-to-save
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159 "^/[^/:]*:"
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160 "Regexp identifying files whose buffers are to be excluded from saving.")
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161
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162 (defvar desktop-buffer-handlers
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163 '(desktop-buffer-dired
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164 desktop-buffer-rmail
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165 desktop-buffer-mh
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166 desktop-buffer-info
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167 desktop-buffer-file)
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168 "*List of functions to call in order to create a buffer.
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169 The functions are called without explicit parameters but may access
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170 the the major mode as `mam', the file name as `fn', the buffer name as
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171 `bn', the default directory as `dd'. If some function returns non-nil
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172 no further functions are called. If the function returns t then the
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173 buffer is considered created.")
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174
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175 (defvar desktop-create-buffer-form "(desktop-create-buffer 205"
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176 "Opening of form for creation of new buffers.")
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177
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178 (defvar desktop-save-hook nil
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179 "Hook run before saving the desktop to allow you to cut history lists and
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180 the like shorter.")
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181 ;; ----------------------------------------------------------------------------
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182 (defvar desktop-dirname nil
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183 "The directory in which the current desktop file resides.")
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184
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185 (defconst desktop-header
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186 ";; --------------------------------------------------------------------------
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187 ;; Desktop File for Emacs
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188 ;; --------------------------------------------------------------------------
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189 " "*Header to place in Desktop file.")
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190
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191 (defvar desktop-delay-hook nil
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192 "Hooks run after all buffers are loaded; intended for internal use.")
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193 ;; ----------------------------------------------------------------------------
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194 (defun desktop-truncate (l n)
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195 "Truncate LIST to at most N elements destructively."
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196 (let ((here (nthcdr (1- n) l)))
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197 (if (consp here)
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198 (setcdr here nil))))
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199 ;; ----------------------------------------------------------------------------
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200 (defun desktop-clear () "Empty the Desktop."
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201 (interactive)
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202 (setq kill-ring nil
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203 kill-ring-yank-pointer nil
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204 search-ring nil
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205 search-ring-yank-pointer nil
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206 regexp-search-ring nil
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207 regexp-search-ring-yank-pointer nil)
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208 (mapcar (function (lambda (x)
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209 ;; XEmacs change
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210 (if (not (equal (buffer-name x) "*Warnings*"))
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211 (kill-buffer x)))) (buffer-list))
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212 (delete-other-windows))
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213 ;; ----------------------------------------------------------------------------
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214 (add-hook 'kill-emacs-hook 'desktop-kill)
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215
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216 (defun desktop-kill ()
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217 (if desktop-dirname
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218 (condition-case err
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219 (desktop-save desktop-dirname)
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220 (file-error
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221 (if (yes-or-no-p "Error while saving the desktop. Quit anyway? ")
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222 nil
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223 (signal (car err) (cdr err)))))))
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224 ;; ----------------------------------------------------------------------------
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225 (defun desktop-internal-v2s (val)
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226 "Convert VALUE to a pair (QUOTE . TXT); (eval (read TXT)) gives VALUE.
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227 TXT is a string that when read and evaluated yields value.
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228 QUOTE may be `may' (value may be quoted),
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229 `must' (values must be quoted), or nil (value may not be quoted)."
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230 (cond
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231 ((or (numberp val) (null val) (eq t val))
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232 (cons 'may (prin1-to-string val)))
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233 ((stringp val)
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234 (let ((copy (copy-sequence val)))
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235 (set-text-properties 0 (length copy) nil copy)
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236 ;; Get rid of text properties because we cannot read them
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237 (cons 'may (prin1-to-string copy))))
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238 ((symbolp val)
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239 (cons 'must (prin1-to-string val)))
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240 ((vectorp val)
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241 (let* ((special nil)
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242 (pass1 (mapcar
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243 (lambda (el)
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244 (let ((res (desktop-internal-v2s el)))
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245 (if (null (car res))
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246 (setq special t))
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247 res))
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248 val)))
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249 (if special
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250 (cons nil (concat "(vector "
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251 (mapconcat (lambda (el)
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252 (if (eq (car el) 'must)
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253 (concat "'" (cdr el))
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254 (cdr el)))
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255 pass1
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256 " ")
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257 ")"))
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258 (cons 'may (concat "[" (mapconcat 'cdr pass1 " ") "]")))))
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259 ((consp val)
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260 (let ((p val)
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261 newlist
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262 anynil)
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263 (while (consp p)
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264 (let ((q.txt (desktop-internal-v2s (car p))))
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265 (or anynil (setq anynil (null (car q.txt))))
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266 (setq newlist (cons q.txt newlist)))
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267 (setq p (cdr p)))
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268 (if p
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269 (let ((last (desktop-internal-v2s p))
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270 (el (car newlist)))
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271 (setcar newlist
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272 (if (or anynil (setq anynil (null (car last))))
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273 (cons nil
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274 (concat "(cons "
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275 (if (eq (car el) 'must) "'" "")
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276 (cdr el)
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277 " "
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278 (if (eq (car last) 'must) "'" "")
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279 (cdr last)
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280 ")"))
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281 (cons 'must
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282 (concat (cdr el) " . " (cdr last)))))))
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283 (setq newlist (nreverse newlist))
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284 (if anynil
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285 (cons nil
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286 (concat "(list "
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287 (mapconcat (lambda (el)
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288 (if (eq (car el) 'must)
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289 (concat "'" (cdr el))
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290 (cdr el)))
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291 newlist
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292 " ")
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293 ")"))
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294 (cons 'must
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295 (concat "(" (mapconcat 'cdr newlist " ") ")")))))
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296 ((subrp val)
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297 (cons nil (concat "(symbol-function '"
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298 (substring (prin1-to-string val) 7 -1)
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299 ")")))
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300 ((markerp val)
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301 (let ((pos (prin1-to-string (marker-position val)))
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302 (buf (prin1-to-string (buffer-name (marker-buffer val)))))
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303 (cons nil (concat "(let ((mk (make-marker)))"
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304 " (add-hook 'desktop-delay-hook"
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305 " (list 'lambda '() (list 'set-marker mk "
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306 pos " (get-buffer " buf ")))) mk)"))))
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307 (t ; save as text
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308 (cons 'may "\"Unprintable entity\""))))
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309
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310 (defun desktop-value-to-string (val)
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311 "Convert VALUE to a string that when read evaluates to the same value.
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312 Not all types of values are supported."
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313 (let* ((print-escape-newlines t)
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314 (float-output-format nil)
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315 (quote.txt (desktop-internal-v2s val))
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316 (quote (car quote.txt))
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317 (txt (cdr quote.txt)))
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318 (if (eq quote 'must)
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319 (concat "'" txt)
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320 txt)))
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321 ;; ----------------------------------------------------------------------------
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322 (defun desktop-outvar (varspec)
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323 "Output a setq statement for variable VAR to the desktop file.
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324 The argument VARSPEC may be the variable name VAR (a symbol),
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325 or a cons cell of the form (VAR . MAX-SIZE),
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326 which means to truncate VAR's value to at most MAX-SIZE elements
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327 \(if the value is a list) before saving the value."
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328 (let (var size)
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329 (if (consp varspec)
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330 (setq var (car varspec) size (cdr varspec))
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331 (setq var varspec))
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332 (if (boundp var)
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333 (progn
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334 (if (and (integerp size)
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335 (> size 0)
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336 (listp (eval var)))
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337 (desktop-truncate (eval var) size))
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338 (insert "(setq "
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339 (symbol-name var)
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340 " "
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341 (desktop-value-to-string (symbol-value var))
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342 ")\n")))))
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343 ;; ----------------------------------------------------------------------------
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344 (defun desktop-save-buffer-p (filename bufname mode &rest dummy)
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345 "Return t if the desktop should record a particular buffer for next startup.
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346 FILENAME is the visited file name, BUFNAME is the buffer name, and
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347 MODE is the major mode."
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348 (let ((case-fold-search nil))
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349 (or (and filename
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350 (not (string-match desktop-buffers-not-to-save bufname))
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351 (not (string-match desktop-files-not-to-save filename)))
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352 (and (eq mode 'dired-mode)
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353 (save-excursion
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354 (set-buffer (get-buffer bufname))
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355 (not (string-match desktop-files-not-to-save
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356 default-directory))))
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357 (and (null filename)
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358 (memq mode '(Info-mode rmail-mode))))))
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359 ;; ----------------------------------------------------------------------------
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360 (defun desktop-save (dirname)
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361 "Save the Desktop file. Parameter DIRNAME specifies where to save desktop."
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362 (interactive "DDirectory to save desktop file in: ")
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363 (run-hooks 'desktop-save-hook)
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364 (save-excursion
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365 (let ((filename (expand-file-name
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366 (concat dirname desktop-basefilename)))
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367 (info (nreverse
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368 (mapcar
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369 (function (lambda (b)
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370 (set-buffer b)
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371 (list
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372 (buffer-file-name)
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373 (buffer-name)
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374 major-mode
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375 (list ; list explaining minor modes
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376 (not (null auto-fill-function)))
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377 (point)
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378 (list (mark t) ;; mark-active
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379 (not (null (mark)))) ; XEmacs
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380 buffer-read-only
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381 (cond ((eq major-mode 'Info-mode)
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382 (list Info-current-file
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383 Info-current-node))
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384 ((eq major-mode 'dired-mode)
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385 (cons
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386 (expand-file-name dired-directory)
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387 (cdr
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388 (nreverse
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389 (mapcar
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390 (function car)
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391 dired-subdir-alist))))))
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392 (let ((locals desktop-locals-to-save)
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393 (loclist (buffer-local-variables))
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394 (ll))
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395 (while locals
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396 (let ((here (assq (car locals) loclist)))
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397 (if here
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398 (setq ll (cons here ll))
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399 (if (member (car locals) loclist)
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400 (setq ll (cons (car locals) ll)))))
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401 (setq locals (cdr locals)))
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402 ll)
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403 )))
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404 (buffer-list))))
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405 (buf (get-buffer-create "*desktop*")))
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406 (set-buffer buf)
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407 (erase-buffer)
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408
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409 (insert desktop-header
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410 ";; Created " (current-time-string) "\n"
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411 ";; Emacs version " emacs-version "\n\n"
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412 ";; Global section:\n")
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413 (mapcar (function desktop-outvar) desktop-globals-to-save)
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414 (if (memq 'kill-ring desktop-globals-to-save)
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415 (insert "(setq kill-ring-yank-pointer (nthcdr "
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416 (int-to-string
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417 (- (length kill-ring) (length kill-ring-yank-pointer)))
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418 " kill-ring))\n"))
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419
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420 (insert "\n;; Buffer section:\n")
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421 (mapcar
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422 (function (lambda (l)
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423 (if (apply 'desktop-save-buffer-p l)
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424 (progn
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425 (insert desktop-create-buffer-form)
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426 (mapcar
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427 (function (lambda (e)
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428 (insert "\n "
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429 (desktop-value-to-string e))))
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430 l)
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431 (insert ")\n\n")))))
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432 info)
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433 (setq default-directory dirname)
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434 (if (file-exists-p filename) (delete-file filename))
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435 (write-region (point-min) (point-max) filename nil 'nomessage)))
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436 (setq desktop-dirname dirname))
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437 ;; ----------------------------------------------------------------------------
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438 (defun desktop-remove ()
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439 "Delete the Desktop file and inactivate the desktop system."
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440 (interactive)
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441 (if desktop-dirname
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442 (let ((filename (concat desktop-dirname desktop-basefilename)))
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443 (setq desktop-dirname nil)
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444 (if (file-exists-p filename)
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445 (delete-file filename)))))
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446 ;; ----------------------------------------------------------------------------
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447 (defun desktop-read ()
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448 "Read the Desktop file and the files it specifies."
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449 (interactive)
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450 (let ((filename))
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451 (if (file-exists-p (concat "./" desktop-basefilename))
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452 (setq desktop-dirname (expand-file-name "./"))
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453 (if (file-exists-p (concat "~/" desktop-basefilename))
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454 (setq desktop-dirname (expand-file-name "~/"))
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455 (setq desktop-dirname nil)))
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456 (if desktop-dirname
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457 (progn
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458 (load (concat desktop-dirname desktop-basefilename) t t t)
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459 (run-hooks 'desktop-delay-hook)
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460 (message "Desktop loaded."))
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461 (desktop-clear))))
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462 ;; ----------------------------------------------------------------------------
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463 (defun desktop-load-default ()
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464 "Load the `default' start-up library manually.
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465 Also inhibit further loading of it. Call this from your `.emacs' file
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466 to provide correct modes for autoloaded files."
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467 (if (not inhibit-default-init) ; safety check
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468 (progn
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469 (load "default" t t)
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470 (setq inhibit-default-init t))))
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471 ;; ----------------------------------------------------------------------------
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472 ;; Note: the following functions use the dynamic variable binding in Lisp.
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473 ;;
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474 (defun desktop-buffer-info () "Load an info file."
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475 (if (eq 'Info-mode mam)
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476 (progn
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477 (require 'info)
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478 (Info-find-node (nth 0 misc) (nth 1 misc))
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479 t)))
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480 ;; ----------------------------------------------------------------------------
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481 (defun desktop-buffer-rmail () "Load an RMAIL file."
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482 (if (eq 'rmail-mode mam)
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483 (condition-case error
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484 (progn (rmail-input fn) t)
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485 (file-locked
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486 (kill-buffer (current-buffer))
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487 'ignored))))
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488 ;; ----------------------------------------------------------------------------
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489 (defun desktop-buffer-mh () "Load a folder in the mh system."
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490 (if (eq 'mh-folder-mode mam)
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491 (progn
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492 (require 'mh-e)
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493 (mh-find-path)
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494 (mh-visit-folder bn)
|
|
|
495 t)))
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|
496 ;; ----------------------------------------------------------------------------
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497 (defun desktop-buffer-dired () "Load a directory using dired."
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498 (if (eq 'dired-mode mam)
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499 (if (file-directory-p (file-name-directory (car misc)))
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500 (progn
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501 (dired (car misc))
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502 (mapcar 'dired-insert-subdir (cdr misc))
|
|
|
503 t)
|
|
|
504 (message "Directory %s no longer exists." (car misc))
|
|
|
505 (sit-for 1)
|
|
|
506 'ignored)))
|
|
|
507 ;; ----------------------------------------------------------------------------
|
|
|
508 (defun desktop-buffer-file () "Load a file."
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|
|
509 (if fn
|
|
|
510 (if (or (file-exists-p fn)
|
|
|
511 (and desktop-missing-file-warning
|
|
|
512 (y-or-n-p (format
|
|
|
513 "File \"%s\" no longer exists. Re-create? "
|
|
|
514 fn))))
|
|
|
515 (progn (find-file fn) t)
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|
|
516 'ignored)))
|
|
|
517 ;; ----------------------------------------------------------------------------
|
|
|
518 ;; Create a buffer, load its file, set is mode, ...; called from Desktop file
|
|
|
519 ;; only.
|
|
|
520 (defun desktop-create-buffer (ver fn bn mam mim pt mk ro misc &optional locals)
|
|
|
521 (let ((hlist desktop-buffer-handlers)
|
|
|
522 (result)
|
|
|
523 (handler))
|
|
|
524 (while (and (not result) hlist)
|
|
|
525 (setq handler (car hlist))
|
|
|
526 (setq result (funcall handler))
|
|
|
527 (setq hlist (cdr hlist)))
|
|
|
528 (if (eq result t)
|
|
|
529 (progn
|
|
|
530 (if (not (equal (buffer-name) bn))
|
|
|
531 (rename-buffer bn))
|
|
|
532 (auto-fill-mode (if (nth 0 mim) 1 0))
|
|
|
533 (goto-char pt)
|
|
|
534 (if (consp mk)
|
|
|
535 (progn
|
|
|
536 (set-mark (car mk))
|
|
|
537 ;; (setq mark-active (car (cdr mk))))
|
|
|
538 (if (car (cdr mk)) (zmacs-activate-region))) ; XEmacs
|
|
|
539 (set-mark mk))
|
|
|
540 ;; Never override file system if the file really is read-only marked.
|
|
|
541 (if ro (setq buffer-read-only ro))
|
|
|
542 (while locals
|
|
|
543 (let ((this (car locals)))
|
|
|
544 (if (consp this)
|
|
|
545 ;; an entry of this form `(symbol . value)'
|
|
|
546 (progn
|
|
|
547 (make-local-variable (car this))
|
|
|
548 (set (car this) (cdr this)))
|
|
|
549 ;; an entry of the form `symbol'
|
|
|
550 (make-local-variable this)
|
|
|
551 (makunbound this)))
|
|
|
552 (setq locals (cdr locals)))
|
|
|
553 ))))
|
|
|
554
|
|
|
555 ;; Backward compatibility -- update parameters to 205 standards.
|
|
|
556 (defun desktop-buffer (fn bn mam mim pt mk ro tl fc cfs cr misc)
|
|
|
557 (desktop-create-buffer 205 fn bn mam (cdr mim) pt mk ro misc
|
|
|
558 (list (cons 'truncate-lines tl)
|
|
|
559 (cons 'fill-column fc)
|
|
|
560 (cons 'case-fold-search cfs)
|
|
|
561 (cons 'case-replace cr)
|
|
|
562 (cons 'overwrite-mode (car mim)))))
|
|
|
563 ;; ----------------------------------------------------------------------------
|
|
|
564 (provide 'desktop)
|
|
|
565
|
|
|
566 ;; desktop.el ends here.
|
