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209
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1 ;;; auto-save.el -- Safer autosaving for EFS and tmp.
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2
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3 ;; Copyright (C) 1997 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1992 by Sebastian Kremer <sk@thp.uni-koeln.de>
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5
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6 ;; Author: Sebastian Kremer <sk@thp.uni-koeln.de>
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7 ;; Maintainer: XEmacs Development Team
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8 ;; Keywords: extensions, dumped
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9 ;; Version: 1.26
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 1, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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24 ;; 02111-1307, USA.
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25
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26 ;;; Synched up with: Not in FSF
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27
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28 ;;; Commentary:
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29
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30 ;; This file is dumped with XEmacs.
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31
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32 ;; Combines autosaving for efs (to a local or remote directory)
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33 ;; with the ability to do autosaves to a fixed directory on a local
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34 ;; disk, in case NFS is slow. The auto-save file used for
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35 ;; /usr/foo/bar/baz.txt
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36 ;; will be
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37 ;; AUTOSAVE/#\!usr\!foo\!bar\!baz.txt#
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38 ;; assuming AUTOSAVE is the non-nil value of the variable
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39 ;; `auto-save-directory'.
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40
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41 ;; Takes care that autosave files for non-file-buffers (e.g. *mail*)
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42 ;; from two simultaneous Emacses don't collide.
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43
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44 ;; Autosaves even if the current directory is not writable.
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45
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46 ;; Can limit autosave names to 14 characters using a hash function,
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47 ;; see `auto-save-hash-p'.
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48
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49 ;; See `auto-save-directory' and `make-auto-save-file-name' and
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50 ;; references therein for complete documentation.
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51
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52 ;; `M-x recover-all-files' will effectively do recover-file on all
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53 ;; files whose autosave file is newer (one of the benefits of having
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54 ;; all autosave files in the same place).
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55
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56 ;; This file is dumped with XEmacs.
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57
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58 ;; If you want to autosave in the fixed directory /tmp/USER-autosave/
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59 ;; (setq auto-save-directory
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60 ;; (concat "/tmp/" (user-login-name) "-autosave/"))
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61
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62 ;; If you don't want to save in /tmp (e.g., because it is swap
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63 ;; mounted) but rather in ~/autosave/
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64 ;; (setq auto-save-directory (expand-file-name "~/.autosave/"))
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65
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66 ;; If you want to save each file in its own directory (the default)
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67 ;; (setq auto-save-directory nil)
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68 ;; You still can take advantage of autosaving efs remote files
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69 ;; in a fixed local directory, `auto-save-directory-fallback' will
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70 ;; be used.
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71
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72 ;; If you want to use 14 character hashed autosave filenames
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73 ;; (setq auto-save-hash-p t)
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74
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75 ;; Finally, put this line after the others in your ~/.emacs:
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76 ;; (require 'auto-save)
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77
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78
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79 ;;; Acknowledgement:
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80
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81 ;; This code is loosely derived from autosave-in-tmp.el by Jamie
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82 ;; Zawinski <jwz@netscape.com> (the version I had was last modified 22
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83 ;; dec 90 jwz) and code submitted to ange-ftp-lovers on Sun, 5 Apr
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84 ;; 92 23:20:47 EDT by drw@BOURBAKI.MIT.EDU (Dale R. Worley).
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85 ;; auto-save.el tries to cover the functionality of those two
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86 ;; packages.
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87
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88 ;; Valuable comments and help from Dale Worley, Andy Norman, Jamie
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89 ;; Zawinski and Sandy Rutherford are gratefully acknowledged.
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90
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91 (defconst auto-save-version "1.26"
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92 "Version number of auto-save.")
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93
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94 (provide 'auto-save)
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95
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96
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97 ;;; Customization:
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98
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99 (defgroup auto-save nil
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100 "Autosaving with support for efs and /tmp."
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101 :group 'data)
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102
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103 (put 'auto-save-interval 'custom-type 'integer)
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104 (put 'auto-save-interval 'factory-value '(300))
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105 (custom-add-to-group 'auto-save 'auto-save-interval 'custom-variable)
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106
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107 (defcustom auto-save-directory nil
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108
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109 ;; Don't make this user-variable-p, it should be set in .emacs and
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110 ;; left at that. In particular, it should remain constant across
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111 ;; several Emacs session to make recover-all-files work.
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112
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113 ;; However, it's OK for it to be customizable, as most of the
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114 ;; customizable variables are set at the time `.emacs' is read.
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115 ;; -hniksic
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116
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117 "If non-nil, fixed directory for autosaving: all autosave files go
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118 there. If this directory does not yet exist at load time, it is
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119 created and its mode is set to 0700 so that nobody else can read your
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120 autosave files.
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121
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122 If nil, each autosave files goes into the same directory as its
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123 corresponding visited file.
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124
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125 A non-nil `auto-save-directory' could be on a local disk such as in
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126 /tmp, then auto-saves will always be fast, even if NFS or the
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127 automounter is slow. In the usual case of /tmp being locally mounted,
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128 note that if you run emacs on two different machines, they will not
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129 see each other's auto-save files.
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130
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131 The value \(expand-file-name \"~/.autosave/\"\) might be better if /tmp
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132 is mounted from swap (possible in SunOS, type `df /tmp' to find out)
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133 and thus vanishes after a reboot, or if your system is particularly
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134 thorough when cleaning up /tmp, clearing even non-empty subdirectories.
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135
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136 It should never be an efs remote filename because that would
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137 defeat `efs-auto-save-remotely'.
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138
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139 Unless you set `auto-save-hash-p', you shouldn't set this to a
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140 directory in a filesystem that does not support long filenames, since
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141 a file named
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142
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143 /home/sk/lib/emacs/lisp/auto-save.el
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144
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145 will have a longish filename like
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146
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147 AUTO-SAVE-DIRECTORY/#\\!home\\!sk\\!lib\\!emacs\\!lisp\\!auto-save.el#
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148
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149 as auto save file.
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150
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151 See also variables `auto-save-directory-fallback',
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152 `efs-auto-save' and `efs-auto-save-remotely'."
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153 :type '(choice (const :tag "Same as file" nil)
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154 directory)
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155 :group 'auto-save)
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156
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157
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158 (defcustom auto-save-hash-p nil
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159 "If non-nil, hashed autosave names of length 14 are used.
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160 This is to avoid autosave filenames longer than 14 characters.
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161 The directory used is `auto-save-hash-directory' regardless of
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162 `auto-save-directory'.
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163 Hashing defeats `recover-all-files', you have to recover files
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164 individually by doing `recover-file'."
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165 :type 'boolean
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166 :group 'auto-save)
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167
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168 ;;; This defvar is in efs.el now, but doesn't hurt to give it here as
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169 ;;; well so that loading first auto-save.el does not abort.
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170
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171 ;; #### Now that `auto-save' is dumped, this is looks obnoxious.
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172 (or (boundp 'efs-auto-save) (defvar efs-auto-save 0))
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173 (or (boundp 'efs-auto-save-remotely) (defvar efs-auto-save-remotely nil))
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174
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175 (defcustom auto-save-offer-delete nil
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176 "*If non-nil, `recover-all-files' offers to delete autosave files
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177 that are out of date or were dismissed for recovering.
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178 Special value 'always deletes those files silently."
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179 :type '(choice (const :tag "on" t)
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180 (const :tag "off" nil)
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181 (const :tag "Delete silently" always))
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182 :group 'auto-save)
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183
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184 ;;;; end of customization
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185
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186
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187 ;;; Preparations to be done at load time
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188
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189 (defvar auto-save-directory-fallback (expand-file-name "~/.autosave/")
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190 ;; not user-variable-p, see above
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191 "Directory used for local autosaving of remote files if
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192 both `auto-save-directory' and `efs-auto-save-remotely' are nil.
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193 Also used if a working directory to be used for autosaving is not writable.
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194 This *must* always be the name of directory that exists or can be
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195 created by you, never nil.")
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196
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197 (defvar auto-save-hash-directory
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198 (expand-file-name "hash/" (or auto-save-directory
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199 auto-save-directory-fallback))
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200 "If non-nil, directory used for hashed autosave filenames.")
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201
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202 (defun auto-save-check-directory (var)
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203 (let ((dir (symbol-value var)))
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204 (if (null dir)
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205 nil
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206 ;; Expand and store back into the variable
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207 (set var (setq dir (expand-file-name dir)))
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208 ;; Make sure directory exists
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209 (if (file-directory-p dir)
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210 nil
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211 ;; Else we create and chmod 0700 the directory
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212 (setq dir (directory-file-name dir)) ; some systems need this
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213 (make-directory dir)
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214 (set-file-modes dir #o700)))))
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215
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216 (mapc #'auto-save-check-directory
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217 '(auto-save-directory auto-save-directory-fallback))
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218
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219 (and auto-save-hash-p
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220 (auto-save-check-directory 'auto-save-hash-directory))
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221
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222
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223 ;;; Computing an autosave name for a file and vice versa
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224
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225 ;; #### Now that this file is dumped, we should turn off the routine
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226 ;; from files.el. But it would make it harder to remove it!
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227
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228 (defun make-auto-save-file-name (&optional file-name);; redefines files.el
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229 ;; auto-save-file-name-p need not be redefined.
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230
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231 "Return file name to use for auto-saves of current buffer.
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232 Does not consider `auto-save-visited-file-name'; that is checked
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233 before calling this function.
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234
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235 Offers to autosave all files in the same `auto-save-directory'. All
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236 autosave files can then be recovered at once with function
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237 `recover-all-files'.
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238
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239 Takes care to make autosave files for files accessed through efs
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240 be local files if variable `efs-auto-save-remotely' is nil.
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241
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242 Takes care of slashes in buffer names to prevent autosave errors.
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243
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244 Takes care that autosave files for buffers not visiting any file (such
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245 as `*mail*') from two simultaneous Emacses don't collide by prepending
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246 the Emacs pid.
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247
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248 Uses 14 character autosave names if `auto-save-hash-p' is true.
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249
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250 Autosaves even if the current directory is not writable, using
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251 directory `auto-save-directory-fallback'.
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252
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253 You can redefine this for customization (he he :-).
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254 See also function `auto-save-file-name-p'."
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255
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256 ;; We have to be very careful about not signalling an error in this
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257 ;; function since files.el does not provide for this (e.g. find-file
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258 ;; would fail for each new file).
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259
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260 (setq file-name (or file-name
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261 buffer-file-truename
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262 (and buffer-file-name
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263 (expand-file-name buffer-file-name))))
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264 (condition-case error-data
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265 (let (
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266 ;; So autosavename looks like #%...#, roughly as with the
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267 ;; old make-auto-save-file-name function. The
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268 ;; make-temp-name inserts the pid of this Emacs: this
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269 ;; avoids autosaving from two Emacses into the same file.
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270 ;; It cannot be recovered automatically then because in
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271 ;; the next Emacs session (the one after the crash) the
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272 ;; pid will be different, but file-less buffers like
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273 ;; *mail* must be recovered manually anyway.
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274
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275 ;; jwz: putting the emacs PID in the auto-save file name is bad
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276 ;; news, because that defeats auto-save-recovery of *mail*
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277 ;; buffers -- the (sensible) code in sendmail.el calls
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278 ;; (make-auto-save-file-name) to determine whether there is
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279 ;; unsent, auto-saved mail to recover. If that mail came from a
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280 ;; previous emacs process (far and away the most likely case)
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281 ;; then this can never succeed as the pid differs.
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282 ;;(name-prefix (if file-name nil (make-temp-name "#%")))
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283 (name-prefix (if file-name nil "#%"))
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284
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285 (save-name (or file-name
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286 ;; Prevent autosave errors. Buffername
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287 ;; (to become non-dir part of filename) will
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288 ;; be unslashified twice. Don't care.
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289 (auto-save-unslashify-name (buffer-name))))
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290 (remote-p (and (stringp file-name)
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291 (fboundp 'efs-ftp-path)
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292 (efs-ftp-path file-name))))
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293 ;; Return the appropriate auto save file name:
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294 (expand-file-name;; a buffername needs this, a filename not
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295 (cond (remote-p
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296 (if efs-auto-save-remotely
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297 (auto-save-name-in-same-directory save-name)
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298 ;; We have to use the `fixed-directory' now since the
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299 ;; `same-directory' would be remote.
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300 ;; It will use the fallback if needed.
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301 (auto-save-name-in-fixed-directory save-name)))
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302 ;; Else it is a local file (or a buffer without a file,
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303 ;; hence the name-prefix).
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304 ((or auto-save-directory auto-save-hash-p)
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305 ;; Hashed files always go into the special hash dir,
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306 ;; never in the same directory, to make recognizing
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307 ;; reliable.
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308 (auto-save-name-in-fixed-directory save-name name-prefix))
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309 (t
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310 (auto-save-name-in-same-directory save-name name-prefix)))))
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311
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312 ;; If any error occurs in the above code, return what the old
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313 ;; version of this function would have done. It is not ok to
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314 ;; return nil, e.g., when after-find-file tests
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315 ;; file-newer-than-file-p, nil would bomb.
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316
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317 (error (warn "Error caught in `make-auto-save-file-name':\n%s"
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318 (error-message-string error-data))
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319 (if buffer-file-name
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320 (concat (file-name-directory buffer-file-name)
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321 "#"
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322 (file-name-nondirectory buffer-file-name)
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323 "#")
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324 (expand-file-name (concat "#%" (buffer-name) "#"))))))
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325
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326 (defun auto-save-original-name (savename)
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327 "Reverse of `make-auto-save-file-name'.
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328 Returns nil if SAVENAME was not associated with a file (e.g., it came
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329 from an autosaved `*mail*' buffer) or does not appear to be an
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330 autosave file at all.
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331 Hashed files are not understood, see `auto-save-hash-p'."
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332 (let ((basename (file-name-nondirectory savename))
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333 (savedir (file-name-directory savename)))
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334 (cond ((or (not (auto-save-file-name-p basename))
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335 (string-match "^#%" basename))
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336 nil)
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337 ;; now we know it looks like #...# thus substring is safe to use
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338 ((or (equal savedir auto-save-directory) ; 2nd arg may be nil
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339 (equal savedir auto-save-directory-fallback))
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340 ;; it is of the `-fixed-directory' type
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341 (auto-save-slashify-name (substring basename 1 -1)))
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342 (t
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343 ;; else it is of `-same-directory' type
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344 (concat savedir (substring basename 1 -1))))))
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345
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346 (defun auto-save-name-in-fixed-directory (filename &optional prefix)
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347 ;; Unslashify and enclose the whole FILENAME in `#' to make an auto
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348 ;; save file in the auto-save-directory, or if that is nil, in
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349 ;; auto-save-directory-fallback (which must be the name of an
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350 ;; existing directory). If the results would be too long for 14
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351 ;; character filenames, and `auto-save-hash-p' is set, hash FILENAME
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352 ;; into a shorter name.
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353 ;; Optional PREFIX is string to use instead of "#" to prefix name.
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354 (let ((base-name (concat (or prefix "#")
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355 (auto-save-unslashify-name filename)
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356 "#")))
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357 (if (and auto-save-hash-p
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358 auto-save-hash-directory
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359 (> (length base-name) 14))
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360 (expand-file-name (auto-save-cyclic-hash-14 filename)
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361 auto-save-hash-directory)
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362 (expand-file-name base-name
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363 (or auto-save-directory
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364 auto-save-directory-fallback)))))
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365
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366 (defun auto-save-name-in-same-directory (filename &optional prefix)
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367 ;; Enclose the non-directory part of FILENAME in `#' to make an auto
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368 ;; save file in the same directory as FILENAME. But if this
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369 ;; directory is not writable, use auto-save-directory-fallback.
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370 ;; FILENAME is assumed to be in non-directory form (no trailing slash).
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371 ;; It may be a name without a directory part (pesumably it really
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372 ;; comes from a buffer name then), the fallback is used then.
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373 ;; Optional PREFIX is string to use instead of "#" to prefix name.
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374 (let ((directory (file-name-directory filename)))
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375 (or (null directory)
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376 (file-writable-p directory)
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377 (setq directory auto-save-directory-fallback))
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378 (concat directory ; (concat nil) is ""
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379 (or prefix "#")
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380 (file-name-nondirectory filename)
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381 "#")))
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382
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383 ;; #### The following two should probably use `replace-in-string'.
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384
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385 (defun auto-save-unslashify-name (s)
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386 ;; "Quote any slashes in string S by replacing them with the two
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387 ;;characters `\\!'.
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388 ;;Also, replace any backslash by double backslash, to make it one-to-one."
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389 (let ((limit 0))
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390 (while (string-match "[/\\]" s limit)
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391 (setq s (concat (substring s 0 (match-beginning 0))
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392 (if (string= (substring s
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393 (match-beginning 0)
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394 (match-end 0))
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395 "/")
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396 "\\!"
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397 "\\\\")
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398 (substring s (match-end 0))))
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399 (setq limit (1+ (match-end 0)))))
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400 s)
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401
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402 (defun auto-save-slashify-name (s)
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403 ;;"Reverse of `auto-save-unslashify-name'."
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404 (let (pos)
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405 (while (setq pos (string-match "\\\\[\\!]" s pos))
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406 (setq s (concat (substring s 0 pos)
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407 (if (eq ?! (aref s (1+ pos))) "/" "\\")
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408 (substring s (+ pos 2)))
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409 pos (1+ pos))))
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410 s)
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411
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412
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413 ;;; Hashing for autosave names
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414
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415 ;;; Hashing function contributed by Andy Norman <ange@hplb.hpl.hp.com>
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416 ;;; based upon C code from pot@fly.cnuce.cnr.IT (Francesco Potorti`).
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417
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418 (defun auto-save-cyclic-hash-14 (s)
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419 ;; "Hash string S into a string of length 14.
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420 ;; A 7-bytes cyclic code for burst correction is calculated on a
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421 ;; byte-by-byte basis. The polynomial used is D^7 + D^6 + D^3 +1.
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422 ;; The resulting string consists of hexadecimal digits [0-9a-f].
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423 ;; In particular, it contains no slash, so it can be used as autosave name."
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424 (let ((crc (make-string 7 ?\0)))
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425 (mapc
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426 (lambda (new)
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427 (setq new (+ new (aref crc 6)))
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428 (aset crc 6 (+ (aref crc 5) new))
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429 (aset crc 5 (aref crc 4))
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430 (aset crc 4 (aref crc 3))
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431 (aset crc 3 (+ (aref crc 2) new))
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432 (aset crc 2 (aref crc 1))
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433 (aset crc 1 (aref crc 0))
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434 (aset crc 0 new))
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435 s)
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436 (format "%02x%02x%02x%02x%02x%02x%02x"
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437 (aref crc 0)
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438 (aref crc 1)
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439 (aref crc 2)
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440 (aref crc 3)
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441 (aref crc 4)
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442 (aref crc 5)
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443 (aref crc 6))))
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444
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445 ;; #### It is unclear to me how the following function is useful. It
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446 ;; should be used in `auto-save-name-in-same-directory', if anywhere.
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447 ;; -hniksic
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448
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449 ;; This leaves two characters that could be used to wrap it in `#' or
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450 ;; make two filenames from it: one for autosaving, and another for a
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451 ;; file containing the name of the autosaved filed, to make hashing
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452 ;; reversible.
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453 ;(defun auto-save-cyclic-hash-12 (s)
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454 ; "Outputs the 12-characters ascii hex representation of a 6-bytes
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455 ;cyclic code for burst correction calculated on STRING on a
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456 ;byte-by-byte basis. The used polynomial is D^6 + D^5 + D^4 + D^3 +1."
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457 ; (let ((crc (make-string 6 0)))
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458 ; (mapc
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459 ; (lambda (new)
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460 ; (setq new (+ new (aref crc 5)))
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461 ; (aset crc 5 (+ (aref crc 4) new))
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462 ; (aset crc 4 (+ (aref crc 3) new))
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463 ; (aset crc 3 (+ (aref crc 2) new))
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464 ; (aset crc 2 (aref crc 1))
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465 ; (aset crc 1 (aref crc 0))
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466 ; (aset crc 0 new))
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467 ; s)
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468 ; (format "%02x%02x%02x%02x%02x%02x"
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469 ; (aref crc 0)
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470 ; (aref crc 1)
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471 ; (aref crc 2)
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472 ; (aref crc 3)
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473 ; (aref crc 4)
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474 ; (aref crc 5))))
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475
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476
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477
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478 ;;; Recovering files
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479
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480 (defun recover-all-files (&optional silent)
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481 "Do recover-file for all autosave files which are current.
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482 Only works if you have a non-nil `auto-save-directory'.
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483
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484 Optional prefix argument SILENT means to be silent about non-current
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485 autosave files. This is useful if invoked automatically at Emacs
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486 startup.
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487
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488 If `auto-save-offer-delete' is t, this function will offer to delete
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489 old or rejected autosave files.
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490
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491 Hashed files (see `auto-save-hash-p') are not understood, use
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492 `recover-file' to recover them individually."
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493 (interactive "P")
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494 (let ((savefiles (directory-files auto-save-directory
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495 t "\\`#" nil t))
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496 afile ; the auto save file
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497 file ; its original file
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498 (total 0) ; # of files offered to recover
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499 (count 0)) ; # of files actually recovered
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500 (or (equal auto-save-directory auto-save-directory-fallback)
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501 (setq savefiles
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502 (nconc savefiles
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503 (directory-files auto-save-directory-fallback
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504 t "\\`#" nil t))))
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505 (while savefiles
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506 (setq afile (car savefiles)
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507 file (auto-save-original-name afile)
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508 savefiles (cdr savefiles))
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509 (cond ((and file (not (file-newer-than-file-p afile file)))
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510 (warn "Autosave file \"%s\" is not current." afile))
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511 (t
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512 (incf total)
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513 (with-output-to-temp-buffer "*Directory*"
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514 (apply 'call-process "ls" nil standard-output nil
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515 "-l" afile (if file (list file))))
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516 (if (yes-or-no-p (format "Recover %s from auto save file? "
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517 (or file "non-file buffer")))
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518 (let* ((obuf (current-buffer)))
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519 (set-buffer (if file
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520 (find-file-noselect file t)
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521 (generate-new-buffer "*recovered*")))
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522 (setq buffer-read-only nil)
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523 (erase-buffer)
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524 (insert-file-contents afile nil)
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525 (ignore-errors
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526 (after-find-file nil))
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527 (setq buffer-auto-save-file-name nil)
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528 (incf count)
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529 (message "\
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530 Auto-save off in buffer \"%s\" till you do M-x auto-save-mode."
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531 (buffer-name))
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532 (set-buffer obuf)
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533 (sit-for 1))
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534 ;; If not used for recovering, offer to delete
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535 ;; autosave file
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536 (and auto-save-offer-delete
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537 (or (eq 'always auto-save-offer-delete)
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538 (yes-or-no-p
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539 (format "Delete autosave file for `%s'? " file)))
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540 (delete-file afile))))))
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541 (if (zerop total)
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542 (or silent (message "Nothing to recover."))
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543 (message "%d/%d file%s recovered." count total (if (= count 1) "" "s"))))
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544 (and (get-buffer "*Directory*")
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545 (kill-buffer "*Directory*")))
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546
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547 ;;; auto-save.el ends here
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