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428
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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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464
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5 ;; Copyright (C) 2001 Ben Wing.
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428
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6
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7 ;; Author: Sebastian Kremer <sk@thp.uni-koeln.de>
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8 ;; Maintainer: XEmacs Development Team
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9 ;; Keywords: extensions, dumped
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10 ;; Version: 1.26
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 1, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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24 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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25 ;; 02111-1307, USA.
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26
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27 ;;; Synched up with: Not in FSF
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28
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29 ;;; Commentary:
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30
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31 ;; This file is dumped with XEmacs.
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32
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33 ;; Combines autosaving for efs (to a local or remote directory)
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34 ;; with the ability to do autosaves to a fixed directory on a local
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35 ;; disk, in case NFS is slow. The auto-save file used for
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36 ;; /usr/foo/bar/baz.txt
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37 ;; will be
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464
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38 ;; AUTOSAVE/#=2Fusr=2Ffoo=2Fbar=2Fbaz.txt#"
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428
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39 ;; assuming AUTOSAVE is the non-nil value of the variable
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40 ;; `auto-save-directory'.
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41
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42 ;; Autosaves even if the current directory is not writable.
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43
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44 ;; Can limit autosave names to 14 characters using a hash function,
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45 ;; see `auto-save-hash-p'.
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46
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47 ;; See `auto-save-directory' and `make-auto-save-file-name' and
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48 ;; references therein for complete documentation.
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49
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50 ;; `M-x recover-all-files' will effectively do recover-file on all
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51 ;; files whose autosave file is newer (one of the benefits of having
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52 ;; all autosave files in the same place).
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53
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54 ;; This file is dumped with XEmacs.
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55
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56 ;; If you want to autosave in the fixed directory /tmp/USER-autosave/
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57 ;; (setq auto-save-directory
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58 ;; (concat "/tmp/" (user-login-name) "-autosave/"))
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59
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60 ;; If you don't want to save in /tmp (e.g., because it is swap
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464
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61 ;; mounted) but rather in ~/.autosave/
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428
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62 ;; (setq auto-save-directory (expand-file-name "~/.autosave/"))
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63
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64 ;; If you want to save each file in its own directory (the default)
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65 ;; (setq auto-save-directory nil)
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66 ;; You still can take advantage of autosaving efs remote files
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67 ;; in a fixed local directory, `auto-save-directory-fallback' will
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68 ;; be used.
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69
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70 ;; If you want to use 14 character hashed autosave filenames
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71 ;; (setq auto-save-hash-p t)
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72
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73 ;; Finally, put this line after the others in your ~/.emacs:
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74 ;; (require 'auto-save)
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75
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76
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77 ;;; Acknowledgement:
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78
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79 ;; This code is loosely derived from autosave-in-tmp.el by Jamie
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80 ;; Zawinski <jwz@jwz.org> (the version I had was last modified 22
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81 ;; dec 90 jwz) and code submitted to ange-ftp-lovers on Sun, 5 Apr
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82 ;; 92 23:20:47 EDT by drw@BOURBAKI.MIT.EDU (Dale R. Worley).
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83 ;; auto-save.el tries to cover the functionality of those two
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84 ;; packages.
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85
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86 ;; Valuable comments and help from Dale Worley, Andy Norman, Jamie
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87 ;; Zawinski and Sandy Rutherford are gratefully acknowledged.
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88
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89 (defconst auto-save-version "1.26"
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90 "Version number of auto-save.")
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91
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92 (provide 'auto-save)
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93
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94
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95 ;;; Customization:
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96
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97 (defgroup auto-save nil
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98 "Autosaving with support for efs and /tmp."
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99 :group 'data)
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100
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101 (put 'auto-save-interval 'custom-type 'integer)
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102 (put 'auto-save-interval 'factory-value '(300))
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103 (custom-add-to-group 'auto-save 'auto-save-interval 'custom-variable)
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104
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105 (defcustom auto-save-directory nil
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106
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107 ;; Don't make this user-variable-p, it should be set in .emacs and
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108 ;; left at that. In particular, it should remain constant across
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109 ;; several Emacs session to make recover-all-files work.
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110
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111 ;; However, it's OK for it to be customizable, as most of the
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112 ;; customizable variables are set at the time `.emacs' is read.
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113 ;; -hniksic
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114
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115 "If non-nil, fixed directory for autosaving: all autosave files go
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116 there. If this directory does not yet exist at load time, it is
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117 created and its mode is set to 0700 so that nobody else can read your
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118 autosave files.
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119
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120 If nil, each autosave files goes into the same directory as its
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121 corresponding visited file.
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122
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123 A non-nil `auto-save-directory' could be on a local disk such as in
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124 /tmp, then auto-saves will always be fast, even if NFS or the
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125 automounter is slow. In the usual case of /tmp being locally mounted,
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126 note that if you run emacs on two different machines, they will not
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127 see each other's auto-save files.
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128
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129 The value \(expand-file-name \"~/.autosave/\"\) might be better if /tmp
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130 is mounted from swap (possible in SunOS, type `df /tmp' to find out)
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131 and thus vanishes after a reboot, or if your system is particularly
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132 thorough when cleaning up /tmp, clearing even non-empty subdirectories.
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133
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134 It should never be an efs remote filename because that would
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135 defeat `efs-auto-save-remotely'.
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136
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137 Unless you set `auto-save-hash-p', you shouldn't set this to a
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138 directory in a filesystem that does not support long filenames, since
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139 a file named
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140
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141 /home/sk/lib/emacs/lisp/auto-save.el
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142
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143 will have a longish filename like
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144
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464
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145 AUTO-SAVE-DIRECTORY/#=2Fhome=2Fsk=2Flib=2Femacs=2Flisp=2Fauto-save.el#
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428
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146
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147 as auto save file.
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148
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149 See also variables `auto-save-directory-fallback',
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150 `efs-auto-save' and `efs-auto-save-remotely'."
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151 :type '(choice (const :tag "Same as file" nil)
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152 directory)
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153 :group 'auto-save)
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154
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155
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156 (defcustom auto-save-hash-p nil
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157 "If non-nil, hashed autosave names of length 14 are used.
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158 This is to avoid autosave filenames longer than 14 characters.
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159 The directory used is `auto-save-hash-directory' regardless of
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160 `auto-save-directory'.
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161 Hashing defeats `recover-all-files', you have to recover files
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162 individually by doing `recover-file'."
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163 :type 'boolean
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164 :group 'auto-save)
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165
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166 ;;; This defvar is in efs.el now, but doesn't hurt to give it here as
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167 ;;; well so that loading first auto-save.el does not abort.
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168
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169 ;; #### Now that `auto-save' is dumped, this is looks obnoxious.
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170 (or (boundp 'efs-auto-save) (defvar efs-auto-save 0))
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171 (or (boundp 'efs-auto-save-remotely) (defvar efs-auto-save-remotely nil))
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172
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173 (defcustom auto-save-offer-delete nil
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174 "*If non-nil, `recover-all-files' offers to delete autosave files
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175 that are out of date or were dismissed for recovering.
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176 Special value 'always deletes those files silently."
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177 :type '(choice (const :tag "on" t)
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178 (const :tag "off" nil)
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179 (const :tag "Delete silently" always))
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180 :group 'auto-save)
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181
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182 ;;;; end of customization
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183
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184
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185 ;;; Preparations to be done at load time
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186
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187 ;; Do not call expand-file-name! This is evaluated at dump time now!
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188 (defvar auto-save-directory-fallback "~/.autosave/"
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189 ;; not user-variable-p, see above
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190 "Directory used for local autosaving of remote files if
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191 both `auto-save-directory' and `efs-auto-save-remotely' are nil.
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192 Also used if a working directory to be used for autosaving is not writable.
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193 This *must* always be the name of directory that exists or can be
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194 created by you, never nil.")
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195
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196 (defvar auto-save-hash-directory
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197 (expand-file-name "hash/" (or auto-save-directory
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198 auto-save-directory-fallback))
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199 "If non-nil, directory used for hashed autosave filenames.")
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200
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201 (defun auto-save-checked-directory (dir)
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202 "Make sure the directory DIR exists and return it expanded if non-nil."
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203 (when dir
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204 (setq dir (expand-file-name dir))
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205 ;; Make sure directory exists
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206 (unless (file-directory-p dir)
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207 ;; Else we create and chmod 0700 the directory
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208 (setq dir (directory-file-name dir)) ; some systems need this
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209 (make-directory dir)
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210 (set-file-modes dir #o700))
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211 dir))
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212
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213 ;; This make no sense at dump time
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214 ;; (mapc #'auto-save-check-directory
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215 ; '(auto-save-directory auto-save-directory-fallback))
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216
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217 ;(and auto-save-hash-p
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218 ; (auto-save-check-directory 'auto-save-hash-directory))
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219
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220
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221 ;;; Computing an autosave name for a file and vice versa
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222
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464
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223 (defun make-auto-save-file-name (&optional file-name)
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428
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224 "Return file name to use for auto-saves of current buffer.
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225 Does not consider `auto-save-visited-file-name'; that is checked
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226 before calling this function.
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227
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228 Offers to autosave all files in the same `auto-save-directory'. All
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229 autosave files can then be recovered at once with function
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230 `recover-all-files'.
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231
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232 Takes care to make autosave files for files accessed through efs
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233 be local files if variable `efs-auto-save-remotely' is nil.
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234
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235 Takes care of slashes in buffer names to prevent autosave errors.
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236
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237 Takes care that autosave files for buffers not visiting any file (such
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238 as `*mail*') from two simultaneous Emacses don't collide by prepending
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239 the Emacs pid.
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240
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241 Uses 14 character autosave names if `auto-save-hash-p' is true.
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242
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243 Autosaves even if the current directory is not writable, using
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244 directory `auto-save-directory-fallback'.
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245
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246 You can redefine this for customization (he he :-).
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247 See also function `auto-save-file-name-p'."
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248
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249 ;; We have to be very careful about not signalling an error in this
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250 ;; function since files.el does not provide for this (e.g. find-file
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251 ;; would fail for each new file).
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252
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253 (setq file-name (or file-name
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254 buffer-file-truename
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255 (and buffer-file-name
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256 (expand-file-name buffer-file-name))))
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257 (condition-case error-data
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258 (let (
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259 ;; So autosavename looks like #%...#, roughly as with the
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260 ;; old make-auto-save-file-name function. The
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261 ;; make-temp-name inserts the pid of this Emacs: this
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262 ;; avoids autosaving from two Emacses into the same file.
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263 ;; It cannot be recovered automatically then because in
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264 ;; the next Emacs session (the one after the crash) the
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265 ;; pid will be different, but file-less buffers like
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266 ;; *mail* must be recovered manually anyway.
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267
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268 ;; jwz: putting the emacs PID in the auto-save file name is bad
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269 ;; news, because that defeats auto-save-recovery of *mail*
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270 ;; buffers -- the (sensible) code in sendmail.el calls
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271 ;; (make-auto-save-file-name) to determine whether there is
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272 ;; unsent, auto-saved mail to recover. If that mail came from a
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273 ;; previous emacs process (far and away the most likely case)
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274 ;; then this can never succeed as the pid differs.
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275 ;;(name-prefix (if file-name nil (make-temp-name "#%")))
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276 (name-prefix (if file-name nil "#%"))
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277
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278 (save-name (or file-name
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279 ;; Prevent autosave errors. Buffername
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280 ;; (to become non-dir part of filename) will
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464
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281 ;; be escaped twice. Don't care.
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282 (auto-save-escape-name (buffer-name))))
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428
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283 (remote-p (and (stringp file-name)
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284 (fboundp 'efs-ftp-path)
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285 (efs-ftp-path file-name))))
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286 ;; Return the appropriate auto save file name:
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287 (expand-file-name;; a buffername needs this, a filename not
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288 (cond (remote-p
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289 (if efs-auto-save-remotely
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290 (auto-save-name-in-same-directory save-name)
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291 ;; We have to use the `fixed-directory' now since the
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292 ;; `same-directory' would be remote.
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293 ;; It will use the fallback if needed.
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294 (auto-save-name-in-fixed-directory save-name)))
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295 ;; Else it is a local file (or a buffer without a file,
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296 ;; hence the name-prefix).
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297 ((or auto-save-directory auto-save-hash-p)
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298 ;; Hashed files always go into the special hash dir,
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299 ;; never in the same directory, to make recognizing
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300 ;; reliable.
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301 (auto-save-name-in-fixed-directory save-name name-prefix))
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302 (t
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303 (auto-save-name-in-same-directory save-name name-prefix)))))
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304
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305 ;; If any error occurs in the above code, return what the old
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306 ;; version of this function would have done. It is not ok to
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307 ;; return nil, e.g., when after-find-file tests
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308 ;; file-newer-than-file-p, nil would bomb.
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309
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310 (error (warn "Error caught in `make-auto-save-file-name':\n%s"
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311 (error-message-string error-data))
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464
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312 (let ((fname
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313 (if file-name
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314 (concat (file-name-directory file-name)
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315 "#"
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316 (file-name-nondirectory file-name)
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317 "#")
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318 (expand-file-name
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319 (concat "#%" (auto-save-escape-name (buffer-name))
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320 "#")))))
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321 (if (or (file-writable-p fname)
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322 (file-exists-p fname))
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323 fname
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324 (expand-file-name (concat "~/"
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325 (file-name-nondirectory fname))))))))
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326
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327 (defun auto-save-file-name-p (filename)
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328 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
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329 FILENAME should lack slashes.
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330 You can redefine this for customization."
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331 (string-match "\\`#.*#\\'" filename))
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428
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332
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333 (defun auto-save-original-name (savename)
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334 "Reverse of `make-auto-save-file-name'.
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335 Returns nil if SAVENAME was not associated with a file (e.g., it came
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336 from an autosaved `*mail*' buffer) or does not appear to be an
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337 autosave file at all.
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338 Hashed files are not understood, see `auto-save-hash-p'."
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339 (let ((basename (file-name-nondirectory savename))
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340 (savedir (file-name-directory savename)))
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341 (cond ((or (not (auto-save-file-name-p basename))
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342 (string-match "^#%" basename))
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343 nil)
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344 ;; now we know it looks like #...# thus substring is safe to use
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345 ((or (equal savedir
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346 (and auto-save-directory
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347 (expand-file-name auto-save-directory)))
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348 ; 2nd arg may be nil
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349 (equal savedir
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350 (expand-file-name auto-save-directory-fallback)))
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351 ;; it is of the `-fixed-directory' type
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464
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352 (auto-save-unescape-name (substring basename 1 -1)))
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428
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353 (t
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354 ;; else it is of `-same-directory' type
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355 (concat savedir (substring basename 1 -1))))))
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356
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357 (defun auto-save-name-in-fixed-directory (filename &optional prefix)
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464
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358 ;; Escape and enclose the whole FILENAME in `#' to make an auto
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428
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359 ;; save file in the auto-save-directory, or if that is nil, in
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360 ;; auto-save-directory-fallback (which must be the name of an
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361 ;; existing directory). If the results would be too long for 14
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362 ;; character filenames, and `auto-save-hash-p' is set, hash FILENAME
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363 ;; into a shorter name.
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364 ;; Optional PREFIX is string to use instead of "#" to prefix name.
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365 (let ((base-name (concat (or prefix "#")
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464
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366 (auto-save-escape-name filename)
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428
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367 "#")))
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368 (if (and auto-save-hash-p
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369 auto-save-hash-directory
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370 (> (length base-name) 14))
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371 (expand-file-name (auto-save-cyclic-hash-14 filename)
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372 (auto-save-checked-directory auto-save-hash-directory))
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373 (expand-file-name base-name
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374 (auto-save-checked-directory
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375 (or auto-save-directory
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376 auto-save-directory-fallback))))))
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377
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378 (defun auto-save-name-in-same-directory (filename &optional prefix)
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379 ;; Enclose the non-directory part of FILENAME in `#' to make an auto
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380 ;; save file in the same directory as FILENAME. But if this
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381 ;; directory is not writable, use auto-save-directory-fallback.
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382 ;; FILENAME is assumed to be in non-directory form (no trailing slash).
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440
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383 ;; It may be a name without a directory part (presumably it really
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428
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384 ;; comes from a buffer name then), the fallback is used then.
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385 ;; Optional PREFIX is string to use instead of "#" to prefix name.
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386 (let ((directory (file-name-directory filename)))
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387 (or (null directory)
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388 (file-writable-p directory)
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389 (setq directory (auto-save-checked-directory
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390 auto-save-directory-fallback)))
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391 (concat directory ; (concat nil) is ""
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392 (or prefix "#")
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393 (file-name-nondirectory filename)
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394 "#")))
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395
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464
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396 (defconst auto-save-reserved-chars
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397 '(
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398 ?\0 ?\1 ?\2 ?\3 ?\4 ?\5 ?\6 ?\7 ?\10 ?\11 ?\12 ?\13 ?\14 ?\15 ?\16
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399 ?\17 ?\20 ?\21 ?\22 ?\23 ?\24 ?\25 ?\26 ?\27 ?\30 ?\31 ?\32 ?\33
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400 ?\34 ?\35 ?\36 ?\37 ?\40 ?? ?* ?: ?< ?> ?| ?/ ?\\ ?& ?^ ?% ?= ?\")
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401 "List of characters disallowed (or potentially disallowed) in filenames.
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402 Includes everything that can get us into trouble under MS Windows or Unix.")
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403
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404 ;; This code based on code in Bill Perry's url.el.
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405
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406 (defun auto-save-escape-name (str)
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407 "Escape any evil nasty characters in a potential filename.
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408 Uses quoted-printable-style escaping -- e.g. the dreaded =3D.
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409 Does not use URL escaping (with %) because filenames beginning with #% are
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410 a special signal for non-file buffers."
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411 (mapconcat
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412 (function
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413 (lambda (char)
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414 (if (memq char auto-save-reserved-chars)
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415 (if (< char 16)
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416 (upcase (format "=0%x" char))
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417 (upcase (format "=%x" char)))
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418 (char-to-string char))))
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419 str ""))
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420
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421 (defun auto-save-unhex (x)
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422 (if (> x ?9)
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423 (if (>= x ?a)
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424 (+ 10 (- x ?a))
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425 (+ 10 (- x ?A)))
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426 (- x ?0)))
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428
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427
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464
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428 (defun auto-save-unescape-name (str)
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429 "Undo any escaping of evil nasty characters in a file name.
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430 See `auto-save-escape-name'."
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431 (setq str (or str ""))
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432 (let ((tmp "")
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433 (case-fold-search t))
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434 (while (string-match "=[0-9a-f][0-9a-f]" str)
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435 (let* ((start (match-beginning 0))
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436 (ch1 (auto-save-unhex (elt str (+ start 1))))
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437 (code (+ (* 16 ch1)
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438 (auto-save-unhex (elt str (+ start 2))))))
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439 (setq tmp (concat tmp (substring str 0 start)
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440 (char-to-string code))
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441 str (substring str (match-end 0)))))
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442 (setq tmp (concat tmp str))
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443 tmp))
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444
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|
445 ;; The old versions are below.
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428
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446
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464
|
447 ;(defun auto-save-escape-name (s)
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448 ; ;; "Quote any slashes in string S by replacing them with the two
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449 ; ;;characters `\\!'.
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450 ; ;;Also, replace any backslash by double backslash, to make it one-to-one."
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451 ; (let ((limit 0))
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452 ; (while (string-match "[/\\]" s limit)
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453 ; (setq s (concat (substring s 0 (match-beginning 0))
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454 ; (if (string= (substring s
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455 ; (match-beginning 0)
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456 ; (match-end 0))
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457 ; "/")
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458 ; "\\!"
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459 ; "\\\\")
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460 ; (substring s (match-end 0))))
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461 ; (setq limit (1+ (match-end 0)))))
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462 ; s)
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463
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464 ;(defun auto-save-unescape-name (s)
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465 ; ;;"Reverse of `auto-save-escape-name'."
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466 ; (let (pos)
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467 ; (while (setq pos (string-match "\\\\[\\!]" s pos))
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468 ; (setq s (concat (substring s 0 pos)
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469 ; (if (eq ?! (aref s (1+ pos))) "/" "\\")
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470 ; (substring s (+ pos 2)))
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|
|
471 ; pos (1+ pos))))
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472 ; s)
|
|
428
|
473
|
|
|
474
|
|
|
475 ;;; Hashing for autosave names
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476
|
|
|
477 ;;; Hashing function contributed by Andy Norman <ange@hplb.hpl.hp.com>
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|
478 ;;; based upon C code from pot@fly.cnuce.cnr.IT (Francesco Potorti`).
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|
479
|
|
|
480 (defun auto-save-cyclic-hash-14 (s)
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|
|
481 ;; "Hash string S into a string of length 14.
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|
|
482 ;; A 7-bytes cyclic code for burst correction is calculated on a
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|
|
483 ;; byte-by-byte basis. The polynomial used is D^7 + D^6 + D^3 +1.
|
|
|
484 ;; The resulting string consists of hexadecimal digits [0-9a-f].
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|
485 ;; In particular, it contains no slash, so it can be used as autosave name."
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|
|
486 (let ((crc (make-vector 7 ?\0)))
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|
|
487 (mapc
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|
|
488 (lambda (new)
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|
|
489 (setq new (+ new (aref crc 6)))
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|
|
490 (aset crc 6 (+ (aref crc 5) new))
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|
|
491 (aset crc 5 (aref crc 4))
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|
|
492 (aset crc 4 (aref crc 3))
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|
|
493 (aset crc 3 (+ (aref crc 2) new))
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|
|
494 (aset crc 2 (aref crc 1))
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|
|
495 (aset crc 1 (aref crc 0))
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|
|
496 (aset crc 0 new))
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|
|
497 s)
|
|
|
498 (format "%02x%02x%02x%02x%02x%02x%02x"
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|
|
499 (logand 255 (aref crc 0))
|
|
|
500 (logand 255 (aref crc 1))
|
|
|
501 (logand 255 (aref crc 2))
|
|
|
502 (logand 255 (aref crc 3))
|
|
|
503 (logand 255 (aref crc 4))
|
|
|
504 (logand 255 (aref crc 5))
|
|
|
505 (logand 255 (aref crc 6)))))
|
|
|
506
|
|
|
507 ;; #### It is unclear to me how the following function is useful. It
|
|
|
508 ;; should be used in `auto-save-name-in-same-directory', if anywhere.
|
|
|
509 ;; -hniksic
|
|
|
510
|
|
|
511 ;; This leaves two characters that could be used to wrap it in `#' or
|
|
|
512 ;; make two filenames from it: one for autosaving, and another for a
|
|
464
|
513 ;; file containing the name of the autosaved file, to make hashing
|
|
428
|
514 ;; reversible.
|
|
|
515 ;(defun auto-save-cyclic-hash-12 (s)
|
|
|
516 ; "Outputs the 12-characters ascii hex representation of a 6-bytes
|
|
|
517 ;cyclic code for burst correction calculated on STRING on a
|
|
|
518 ;byte-by-byte basis. The used polynomial is D^6 + D^5 + D^4 + D^3 +1."
|
|
|
519 ; (let ((crc (make-string 6 0)))
|
|
|
520 ; (mapc
|
|
|
521 ; (lambda (new)
|
|
|
522 ; (setq new (+ new (aref crc 5)))
|
|
|
523 ; (aset crc 5 (+ (aref crc 4) new))
|
|
|
524 ; (aset crc 4 (+ (aref crc 3) new))
|
|
|
525 ; (aset crc 3 (+ (aref crc 2) new))
|
|
|
526 ; (aset crc 2 (aref crc 1))
|
|
|
527 ; (aset crc 1 (aref crc 0))
|
|
|
528 ; (aset crc 0 new))
|
|
|
529 ; s)
|
|
|
530 ; (format "%02x%02x%02x%02x%02x%02x"
|
|
|
531 ; (aref crc 0)
|
|
|
532 ; (aref crc 1)
|
|
|
533 ; (aref crc 2)
|
|
|
534 ; (aref crc 3)
|
|
|
535 ; (aref crc 4)
|
|
|
536 ; (aref crc 5))))
|
|
|
537
|
|
|
538
|
|
|
539
|
|
|
540 ;;; Recovering files
|
|
|
541
|
|
|
542 (defun recover-all-files (&optional silent)
|
|
|
543 "Do recover-file for all autosave files which are current.
|
|
|
544 Only works if you have a non-nil `auto-save-directory'.
|
|
|
545
|
|
|
546 Optional prefix argument SILENT means to be silent about non-current
|
|
|
547 autosave files. This is useful if invoked automatically at Emacs
|
|
|
548 startup.
|
|
|
549
|
|
|
550 If `auto-save-offer-delete' is t, this function will offer to delete
|
|
|
551 old or rejected autosave files.
|
|
|
552
|
|
|
553 Hashed files (see `auto-save-hash-p') are not understood, use
|
|
|
554 `recover-file' to recover them individually."
|
|
|
555 (interactive "P")
|
|
|
556 (let ((savefiles (directory-files auto-save-directory
|
|
|
557 t "\\`#" nil t))
|
|
|
558 afile ; the auto save file
|
|
|
559 file ; its original file
|
|
|
560 (total 0) ; # of files offered to recover
|
|
|
561 (count 0)) ; # of files actually recovered
|
|
|
562 (or (equal (expand-file-name auto-save-directory)
|
|
|
563 (expand-file-name auto-save-directory-fallback))
|
|
|
564 (setq savefiles
|
|
|
565 (nconc savefiles
|
|
|
566 (directory-files auto-save-directory-fallback
|
|
|
567 t "\\`#" nil t))))
|
|
|
568 (while savefiles
|
|
|
569 (setq afile (car savefiles)
|
|
|
570 file (auto-save-original-name afile)
|
|
|
571 savefiles (cdr savefiles))
|
|
|
572 (cond ((and file (not (file-newer-than-file-p afile file)))
|
|
|
573 (warn "Autosave file \"%s\" is not current." afile))
|
|
|
574 (t
|
|
|
575 (incf total)
|
|
|
576 (with-output-to-temp-buffer "*Directory*"
|
|
464
|
577 (buffer-disable-undo standard-output)
|
|
|
578 (save-excursion
|
|
|
579 (set-buffer "*Directory*")
|
|
|
580 (setq default-directory (file-name-directory afile))
|
|
|
581 (insert-directory afile "-l")
|
|
|
582 (when file
|
|
|
583 (setq default-directory (file-name-directory file))
|
|
|
584 (insert-directory file "-l"))))
|
|
428
|
585 (if (yes-or-no-p (format "Recover %s from auto save file? "
|
|
|
586 (or file "non-file buffer")))
|
|
|
587 (let* ((obuf (current-buffer)))
|
|
|
588 (set-buffer (if file
|
|
|
589 (find-file-noselect file t)
|
|
|
590 (generate-new-buffer "*recovered*")))
|
|
|
591 (setq buffer-read-only nil)
|
|
|
592 (erase-buffer)
|
|
771
|
593 ;; see comment in `revert-buffer' in files.el about
|
|
|
594 ;; why it's safe to always use `escape-quoted'.
|
|
|
595 (let ((coding-system-for-read 'escape-quoted))
|
|
|
596 (insert-file-contents afile nil))
|
|
428
|
597 (ignore-errors
|
|
|
598 (after-find-file nil))
|
|
|
599 (setq buffer-auto-save-file-name nil)
|
|
|
600 (incf count)
|
|
|
601 (message "\
|
|
|
602 Auto-save off in buffer \"%s\" till you do M-x auto-save-mode."
|
|
|
603 (buffer-name))
|
|
|
604 (set-buffer obuf)
|
|
|
605 (sit-for 1))
|
|
|
606 ;; If not used for recovering, offer to delete
|
|
|
607 ;; autosave file
|
|
|
608 (and auto-save-offer-delete
|
|
|
609 (or (eq 'always auto-save-offer-delete)
|
|
|
610 (yes-or-no-p
|
|
|
611 (format "Delete autosave file for `%s'? " file)))
|
|
|
612 (delete-file afile))))))
|
|
|
613 (if (zerop total)
|
|
|
614 (or silent (message "Nothing to recover."))
|
|
|
615 (message "%d/%d file%s recovered." count total (if (= count 1) "" "s"))))
|
|
|
616 (and (get-buffer "*Directory*")
|
|
|
617 (kill-buffer "*Directory*")))
|
|
|
618
|
|
|
619 ;;; auto-save.el ends here
|
