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1 ;; -*- Emacs-Lisp -*-
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2 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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3 ;;
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4 ;; File: auto-save.el
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5 ;; Version: $Revision: 1.4 $
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6 ;; RCS:
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7 ;; Description: Safer autosaving with support for efs and /tmp.
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8 ;; This version of auto-save is designed to work with efs,
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9 ;; instead of ange-ftp.
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10 ;; Author: Sebastian Kremer <sk@thp.uni-koeln.de>,
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11 ;;
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12 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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13
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14 (defconst auto-save-version (substring "$Revision: 1.4 $" 11 -2)
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15 "Version number of auto-save.")
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16
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17 ;;; Copyright (C) 1992 by Sebastian Kremer <sk@thp.uni-koeln.de>
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18
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19 ;;; This program is free software; you can redistribute it and/or modify
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20 ;;; it under the terms of the GNU General Public License as published by
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21 ;;; the Free Software Foundation; either version 1, or (at your option)
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22 ;;; any later version.
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23
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24 ;;; This program is distributed in the hope that it will be useful,
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25 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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26 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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27 ;;; GNU General Public License for more details.
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28
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29 ;;; You should have received a copy of the GNU General Public License
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30 ;;; along with this program; if not, write to the Free Software
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31 ;;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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32
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33 ;;;; OVERVIEW ==========================================================
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34
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35 ;;; Combines autosaving for efs (to a local or remote directory)
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36 ;;; with the ability to do autosaves to a fixed directory on a local
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37 ;;; disk, in case NFS is slow. The auto-save file used for
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38 ;;; /usr/foo/bar/baz.txt
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39 ;;; will be
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40 ;;; AUTOSAVE/#\!usr\!foo\!bar\!baz.txt#
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41 ;;; assuming AUTOSAVE is the non-nil value of the variable
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42 ;;; `auto-save-directory'.
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43
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44 ;;; Takes care that autosave files for non-file-buffers (e.g. *mail*)
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45 ;;; from two simultaneous Emacses don't collide.
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46
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47 ;;; Autosaves even if the current directory is not writable.
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48
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49 ;;; Can limit autosave names to 14 characters using a hash function,
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50 ;;; see `auto-save-hash-p'.
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51
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52 ;;; See `auto-save-directory' and `make-auto-save-file-name' and
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53 ;;; references therein for complete documentation.
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54
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55 ;;; Meta-x recover-all-files will effectively do recover-file on all
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56 ;;; files whose autosave file is newer (one of the benefits of having
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57 ;;; all autosave files in the same place).
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58
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59 ;;;; INSTALLATION ======================================================
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60
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61 ;;; Put this file into your load-path and the following in your ~/.emacs:
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62
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63 ;;; If you want to autosave in the fixed directory /tmp/USER-autosave/
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64 ;;; (setq auto-save-directory
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65 ;;; (concat "/tmp/" (user-login-name) "-autosave/"))
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66
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67 ;;; If you don't want to save in /tmp (e.g., because it is swap
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68 ;;; mounted) but rather in ~/autosave/
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69 ;;; (setq auto-save-directory (expand-file-name "~/autosave/"))
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70
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71 ;;; If you want to save each file in its own directory (the default)
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72 ;;; (setq auto-save-directory nil)
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73 ;;; You still can take advantage of autosaving efs remote files
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74 ;;; in a fixed local directory, `auto-save-directory-fallback' will
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75 ;;; be used.
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76
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77 ;;; If you want to use 14 character hashed autosave filenames
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78 ;;; (setq auto-save-hash-p t)
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79
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80 ;;; Finally, put this line after the others in your ~/.emacs:
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81 ;;; (require 'auto-save)
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82
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83
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84 ;;;; ACKNOWLEDGEMENT ===================================================
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85
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86 ;;; This code is loosely derived from autosave-in-tmp.el by Jamie
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87 ;;; Zawinski <jwz@lucid.com> (the version I had was last modified 22
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88 ;;; dec 90 jwz) and code submitted to ange-ftp-lovers on Sun, 5 Apr
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89 ;;; 92 23:20:47 EDT by drw@BOURBAKI.MIT.EDU (Dale R. Worley).
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90 ;;; auto-save.el tries to cover the functionality of those two
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91 ;;; packages.
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92
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93 ;;; Valuable comments and help from Dale Worley, Andy Norman, Jamie
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94 ;;; Zawinski and Sandy Rutherford are gratefully acknowledged.
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95
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96 ;;;; PROVISION ========================================================
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97
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98 (provide 'auto-save)
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99
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100 ;;;; CUSTOMIZATION =====================================================
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101
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102 (defvar auto-save-directory nil
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103
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104 ;;; Don't make this user-variable-p, it should be set in .emacs and
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105 ;;; left at that. In particular, it should remain constant across
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106 ;;; several Emacs session to make recover-all-files work.
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107
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108 "If non-nil, fixed directory for autosaving: all autosave files go
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109 there. If this directory does not yet exist at load time, it is
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110 created and its mode is set to 0700 so that nobody else can read your
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111 autosave files.
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112
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113 If nil, each autosave files goes into the same directory as its
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114 corresponding visited file.
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115
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116 A non-nil `auto-save-directory' could be on a local disk such as in
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117 /tmp, then auto-saves will always be fast, even if NFS or the
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118 automounter is slow. In the usual case of /tmp being locally mounted,
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119 note that if you run emacs on two different machines, they will not
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120 see each other's auto-save files.
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121
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122 The value \(expand-file-name \"~/autosave/\"\) might be better if /tmp
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123 is mounted from swap (possible in SunOS, type `df /tmp' to find out)
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124 and thus vanishes after a reboot, or if your system is particularly
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125 thorough when cleaning up /tmp, clearing even non-empty subdirectories.
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126
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127 It should never be an efs remote filename because that would
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128 defeat `efs-auto-save-remotely'.
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129
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130 Unless you set `auto-save-hash-p', you shouldn't set this to a
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131 directory in a filesystem that does not support long filenames, since
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132 a file named
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133
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134 /home/sk/lib/emacs/lisp/auto-save.el
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135
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136 will have a longish filename like
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137
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138 AUTO-SAVE-DIRECTORY/#\\!home\\!sk\\!lib\\!emacs\\!lisp\\!auto-save.el#
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139
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140 as auto save file.
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141
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142 See also variables `auto-save-directory-fallback',
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143 `efs-auto-save' and `efs-auto-save-remotely'.")
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144
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145 (defvar auto-save-hash-p nil
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146 "If non-nil, hashed autosave names of length 14 are used.
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147 This is to avoid autosave filenames longer than 14 characters.
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148 The directory used is `auto-save-hash-directory' regardless of
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149 `auto-save-directory'.
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150 Hashing defeats `recover-all-files', you have to recover files
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151 individually by doing `recover-file'.")
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152
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153 ;;; This defvar is in efs.el now, but doesn't hurt to give it here as
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154 ;;; well so that loading first auto-save.el does not abort.
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155 (or (boundp 'efs-auto-save) (defvar efs-auto-save 0))
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156 (or (boundp 'efs-auto-save-remotely) (defvar efs-auto-save-remotely nil))
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157
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158 (defvar auto-save-offer-delete nil
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159 "*If non-nil, `recover-all-files' offers to delete autosave files
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160 that are out of date or were dismissed for recovering.
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161 Special value 'always deletes those files silently.")
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162
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163 ;;;; end of customization
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164
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165
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166 ;;; Preparations to be done at load time
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167
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168 (defvar auto-save-directory-fallback (expand-file-name "~/autosave/")
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169 ;; not user-variable-p, see above
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170 "Directory used for local autosaving of remote files if
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171 both `auto-save-directory' and `efs-auto-save-remotely' are nil.
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172 Also used if a working directory to be used for autosaving is not writable.
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173 This *must* always be the name of directory that exists or can be
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174 created by you, never nil.")
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175
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176 (defvar auto-save-hash-directory
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177 (expand-file-name "hash/" (or auto-save-directory
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178 auto-save-directory-fallback))
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179 "If non-nil, directory used for hashed autosave filenames.")
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180
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181 (defun auto-save-check-directory (var)
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182 (let ((dir (symbol-value var)))
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183 (if (null dir)
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184 nil
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185 ;; Expand and store back into the variable
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186 (set var (setq dir (expand-file-name dir)))
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187 ;; Make sure directory exists
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188 (if (file-directory-p dir)
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189 nil
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190 ;; Else we create and chmod 0700 the directory
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191 (setq dir (directory-file-name dir)) ; some systems need this
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192 (if (fboundp 'make-directory) ; V19 or tree dired
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193 (make-directory dir)
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194 (call-process "mkdir" nil nil nil dir))
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195 (set-file-modes dir (* 7 8 8))))))
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196
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197 (mapcar (function auto-save-check-directory)
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198 '(auto-save-directory auto-save-directory-fallback))
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199
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200 (and auto-save-hash-p
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201 (auto-save-check-directory 'auto-save-hash-directory))
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202
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203
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204 ;;; Computing an autosave name for a file and vice versa
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205
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206 (defun make-auto-save-file-name ();; redefines files.el
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207 ;; auto-save-file-name-p need not be redefined.
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208
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209 "Return file name to use for auto-saves of current buffer.
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210 Does not consider `auto-save-visited-file-name'; that is checked
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211 before calling this function.
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212
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213 Offers to autosave all files in the same `auto-save-directory'. All
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214 autosave files can then be recovered at once with function
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215 `recover-all-files'.
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216
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217 Takes care to make autosave files for files accessed through efs
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218 be local files if variable `efs-auto-save-remotely' is nil.
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219
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220 Takes care of slashes in buffer names to prevent autosave errors.
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221
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222 Takes care that autosave files for buffers not visiting any file (such
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223 as `*mail*') from two simultaneous Emacses don't collide by prepending
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224 the Emacs pid.
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225
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226 Uses 14 character autosave names if `auto-save-hash-p' is true.
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227
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228 Autosaves even if the current directory is not writable, using
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229 directory `auto-save-directory-fallback'.
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230
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231 You can redefine this for customization (he he :-).
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232 See also function `auto-save-file-name-p'."
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233
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234 ;; We have to be very careful about not signalling an error in this
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235 ;; function since files.el does not provide for this (e.g. find-file
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236 ;; would fail for each new file).
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237
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238 (condition-case error-data
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239 (let* ((file-name (or (and (boundp 'buffer-file-truename)
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240 buffer-file-truename
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241 ;; Make sure that the file name is expanded.
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242 (expand-file-name buffer-file-name))
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243 (and buffer-file-name
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244 (expand-file-name buffer-file-name))))
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245 ;; So autosavename looks like #%...#, roughly as with the
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246 ;; old make-auto-save-file-name function. The
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247 ;; make-temp-name inserts the pid of this Emacs: this
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248 ;; avoids autosaving from two Emacses into the same file.
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249 ;; It cannot be recovered automatically then because in
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250 ;; the next Emacs session (the one after the crash) the
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251 ;; pid will be different, but file-less buffers like
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252 ;; *mail* must be recovered manually anyway.
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253
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254 ;; jwz: putting the emacs PID in the auto-save file name is bad
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255 ;; news, because that defeats auto-save-recovery of *mail*
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256 ;; buffers -- the (sensible) code in sendmail.el calls
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257 ;; (make-auto-save-file-name) to determine whether there is
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258 ;; unsent, auto-saved mail to recover. If that mail came from a
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259 ;; previous emacs process (far and away the most likely case)
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260 ;; then this can never succeed as the pid differs.
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261 ;; (name-prefix (if file-name nil (make-temp-name "#%")))
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262 (name-prefix (if file-name nil "#%"))
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263
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264 (save-name (or file-name
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265 ;; Prevent autosave errors. Buffername
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266 ;; (to become non-dir part of filename) will
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267 ;; be unslashified twice. Don't care.
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268 (auto-save-unslashify-name (buffer-name))))
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269 (remote-p (and (stringp file-name)
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270 (fboundp 'efs-ftp-path)
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271 (efs-ftp-path file-name))))
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272 ;; Return the appropriate auto save file name:
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273 (expand-file-name;; a buffername needs this, a filename not
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274 (if remote-p
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275 (if efs-auto-save-remotely
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276 (auto-save-name-in-same-directory save-name)
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277 ;; We have to use the `fixed-directory' now since the
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278 ;; `same-directory' would be remote.
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279 ;; It will use the fallback if needed.
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280 (auto-save-name-in-fixed-directory save-name))
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281 ;; Else it is a local file (or a buffer without a file, hence
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282 ;; the name-prefix).
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283 ;; Hashed files always go into the special hash dir, never
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284 ;; in the same directory, to make recognizing reliable.
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285 (if (or auto-save-directory auto-save-hash-p)
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286 (auto-save-name-in-fixed-directory save-name name-prefix)
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287 (auto-save-name-in-same-directory save-name name-prefix)))))
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288
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289 ;; If any error occurs in the above code, return what the old
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290 ;; version of this function would have done. It is not ok to
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291 ;; return nil, e.g., when after-find-file tests
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292 ;; file-newer-than-file-p, nil would bomb.
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293
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294 (error (progn
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295 (message "make-auto-save-file-name %s" error-data)
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296 (sit-for 2)
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297 (if buffer-file-name
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298 (concat (file-name-directory buffer-file-name)
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299 "#"
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300 (file-name-nondirectory buffer-file-name)
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301 "#")
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302 (expand-file-name (concat "#%" (buffer-name) "#")))))))
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303
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304 (defun auto-save-original-name (savename)
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305 "Reverse of `make-auto-save-file-name'.
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306 Returns nil if SAVENAME was not associated with a file (e.g., it came
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307 from an autosaved `*mail*' buffer) or does not appear to be an
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308 autosave file at all.
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309 Hashed files are not understood, see `auto-save-hash-p'."
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310 (let ((basename (file-name-nondirectory savename))
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311 (savedir (file-name-directory savename)))
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312 (cond ((or (not (auto-save-file-name-p basename))
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313 (string-match "^#%" basename))
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314 nil)
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315 ;; now we know it looks like #...# thus substring is safe to use
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316 ((or (equal savedir auto-save-directory) ; 2nd arg may be nil
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317 (equal savedir auto-save-directory-fallback))
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318 ;; it is of the `-fixed-directory' type
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319 (auto-save-slashify-name (substring basename 1 -1)))
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320 (t
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321 ;; else it is of `-same-directory' type
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322 (concat savedir (substring basename 1 -1))))))
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323
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324 (defun auto-save-name-in-fixed-directory (filename &optional prefix)
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325 ;; Unslashify and enclose the whole FILENAME in `#' to make an auto
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326 ;; save file in the auto-save-directory, or if that is nil, in
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327 ;; auto-save-directory-fallback (which must be the name of an
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328 ;; existing directory). If the results would be too long for 14
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329 ;; character filenames, and `auto-save-hash-p' is set, hash FILENAME
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330 ;; into a shorter name.
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331 ;; Optional PREFIX is string to use instead of "#" to prefix name.
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332 (let ((base-name (concat (or prefix "#")
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333 (auto-save-unslashify-name filename)
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334 "#")))
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335 (if (and auto-save-hash-p
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336 auto-save-hash-directory
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337 (> (length base-name) 14))
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338 (expand-file-name (auto-save-cyclic-hash-14 filename)
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339 auto-save-hash-directory)
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340 (expand-file-name base-name
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341 (or auto-save-directory
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342 auto-save-directory-fallback)))))
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343
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344 (defun auto-save-name-in-same-directory (filename &optional prefix)
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345 ;; Enclose the non-directory part of FILENAME in `#' to make an auto
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346 ;; save file in the same directory as FILENAME. But if this
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347 ;; directory is not writable, use auto-save-directory-fallback.
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348 ;; FILENAME is assumed to be in non-directory form (no trailing slash).
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349 ;; It may be a name without a directory part (pesumably it really
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350 ;; comes from a buffer name then), the fallback is used then.
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351 ;; Optional PREFIX is string to use instead of "#" to prefix name.
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352 (let ((directory (file-name-directory filename)))
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353 (or (null directory)
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354 (file-writable-p directory)
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355 (setq directory auto-save-directory-fallback))
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356 (concat directory ; (concat nil) is ""
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357 (or prefix "#")
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358 (file-name-nondirectory filename)
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359 "#")))
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360
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361 (defun auto-save-unslashify-name (s)
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362 ;; "Quote any slashes in string S by replacing them with the two
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363 ;;characters `\\!'.
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364 ;;Also, replace any backslash by double backslash, to make it one-to-one."
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365 (let ((limit 0))
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366 (while (string-match "[/\\]" s limit)
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367 (setq s (concat (substring s 0 (match-beginning 0))
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368 (if (string= (substring s
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369 (match-beginning 0)
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370 (match-end 0))
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371 "/")
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372 "\\!"
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373 "\\\\")
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374 (substring s (match-end 0))))
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375 (setq limit (1+ (match-end 0)))))
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376 s)
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377
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378 (defun auto-save-slashify-name (s)
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379 ;;"Reverse of `auto-save-unslashify-name'."
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380 (let (pos)
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381 (while (setq pos (string-match "\\\\[\\!]" s pos))
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382 (setq s (concat (substring s 0 pos)
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383 (if (eq ?! (aref s (1+ pos))) "/" "\\")
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384 (substring s (+ pos 2)))
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385 pos (1+ pos))))
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386 s)
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387
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388
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389 ;;; Hashing for autosave names
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390
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391 ;;; Hashing function contributed by Andy Norman <ange@hplb.hpl.hp.com>
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392 ;;; based upon C code from pot@fly.cnuce.cnr.IT (Francesco Potorti`).
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393
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394 (defun auto-save-cyclic-hash-14 (s)
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395 ;; "Hash string S into a string of length 14.
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24
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396 ;; A 7-bytes cyclic code for burst correction is calculated on a
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397 ;; byte-by-byte basis. The polynomial used is D^7 + D^6 + D^3 +1.
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0
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398 ;; The resulting string consists of hexadecimal digits [0-9a-f].
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399 ;; In particular, it contains no slash, so it can be used as autosave name."
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24
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400 (let ((crc (make-string 7 0))
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0
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401 result)
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402 (mapcar
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403 (function
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404 (lambda (new)
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24
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405 (setq new (+ new (aref crc 6)))
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0
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406 (aset crc 6 (+ (aref crc 5) new))
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407 (aset crc 5 (aref crc 4))
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408 (aset crc 4 (aref crc 3))
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409 (aset crc 3 (+ (aref crc 2) new))
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410 (aset crc 2 (aref crc 1))
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411 (aset crc 1 (aref crc 0))
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412 (aset crc 0 new)))
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413 s)
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414 (setq result (format "%02x%02x%02x%02x%02x%02x%02x"
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415 (aref crc 0)
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416 (aref crc 1)
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417 (aref crc 2)
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418 (aref crc 3)
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419 (aref crc 4)
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420 (aref crc 5)
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24
|
421 (aref crc 6)))
|
|
0
|
422 result))
|
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423
|
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24
|
424 ;; This leaves two characters that could be used to wrap it in `#' or
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|
|
425 ;; make two filenames from it: one for autosaving, and another for a
|
|
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426 ;; file containing the name of the autosaved filed, to make hashing
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|
|
427 ;; reversible.
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428 (defun auto-save-cyclic-hash-12 (s)
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429 "Outputs the 12-characters ascii hex representation of a 6-bytes
|
|
|
430 cyclic code for burst correction calculated on STRING on a
|
|
|
431 byte-by-byte basis. The used polynomial is D^6 + D^5 + D^4 + D^3 +1."
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|
432 (let ((crc (make-string 6 0)))
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433 (mapcar
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|
434 (function
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435 (lambda (new)
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|
436 (setq new (+ new (aref crc 5)))
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|
|
437 (aset crc 5 (+ (aref crc 4) new))
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|
|
438 (aset crc 4 (+ (aref crc 3) new))
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|
|
439 (aset crc 3 (+ (aref crc 2) new))
|
|
|
440 (aset crc 2 (aref crc 1))
|
|
|
441 (aset crc 1 (aref crc 0))
|
|
|
442 (aset crc 0 new)))
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|
|
443 s)
|
|
|
444 (format "%02x%02x%02x%02x%02x%02x"
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|
|
445 (aref crc 0)
|
|
|
446 (aref crc 1)
|
|
|
447 (aref crc 2)
|
|
|
448 (aref crc 3)
|
|
|
449 (aref crc 4)
|
|
|
450 (aref crc 5))))
|
|
|
451
|
|
0
|
452
|
|
|
453
|
|
|
454 ;;; Recovering files
|
|
|
455
|
|
24
|
456 (defun recover-all-files (&optional silent)
|
|
0
|
457 "Do recover-file for all autosave files which are current.
|
|
|
458 Only works if you have a non-nil `auto-save-directory'.
|
|
24
|
459
|
|
|
460 Optional prefix argument SILENT means to be silent about non-current
|
|
|
461 autosave files. This is useful if invoked automatically at Emacs
|
|
|
462 startup.
|
|
|
463
|
|
|
464 If `auto-save-offer-delete' is t, this function will offer to delete
|
|
|
465 old or rejected autosave files.
|
|
|
466
|
|
0
|
467 Hashed files (see `auto-save-hash-p') are not understood, use
|
|
|
468 `recover-file' to recover them individually."
|
|
24
|
469 (interactive "P")
|
|
0
|
470 (let ((savefiles (directory-files auto-save-directory t "^#"))
|
|
|
471 afile ; the auto save file
|
|
|
472 file ; its original file
|
|
|
473 (total 0) ; # of files offered to recover
|
|
|
474 (count 0)) ; # of files actually recovered
|
|
|
475 (or (equal auto-save-directory auto-save-directory-fallback)
|
|
|
476 (setq savefiles
|
|
|
477 (append savefiles
|
|
|
478 (directory-files auto-save-directory-fallback t "^#"))))
|
|
|
479 (while savefiles
|
|
|
480 (setq afile (car savefiles)
|
|
|
481 file (auto-save-original-name afile)
|
|
|
482 savefiles (cdr savefiles))
|
|
|
483 (cond ((and file (not (file-newer-than-file-p afile file)))
|
|
|
484 (message "autosave file \"%s\" is not current." afile)
|
|
|
485 (sit-for 2))
|
|
|
486 (t
|
|
|
487 (setq total (1+ total))
|
|
|
488 (with-output-to-temp-buffer "*Directory*"
|
|
48
|
489 (apply 'call-process "ls" nil standard-output nil
|
|
|
490 "-l" afile (if file (list file))))
|
|
0
|
491 (if (yes-or-no-p (format "Recover %s from auto save file? "
|
|
48
|
492 (or file "non-file buffer")))
|
|
0
|
493 (let* ((obuf (current-buffer))
|
|
|
494 (buf (set-buffer
|
|
|
495 (if file
|
|
|
496 (find-file-noselect file t)
|
|
|
497 (generate-new-buffer "*recovered*"))))
|
|
|
498 (buffer-read-only nil))
|
|
|
499 (erase-buffer)
|
|
|
500 (insert-file-contents afile nil)
|
|
|
501 (condition-case ()
|
|
|
502 (after-find-file nil)
|
|
|
503 (error nil))
|
|
|
504 (setq buffer-auto-save-file-name nil)
|
|
|
505 (setq count (1+ count))
|
|
|
506 (message "\
|
|
|
507 Auto-save off in buffer \"%s\" till you do M-x auto-save-mode."
|
|
|
508 (buffer-name))
|
|
|
509 (set-buffer obuf)
|
|
24
|
510 (sit-for 1))
|
|
|
511 ;; If not used for recovering, offer to delete
|
|
|
512 ;; autosave file
|
|
|
513 (and auto-save-offer-delete
|
|
|
514 (or (eq 'always auto-save-offer-delete)
|
|
|
515 (yes-or-no-p
|
|
|
516 (format "Delete autosave file for `%s'? " file)))
|
|
|
517 (delete-file afile))))))
|
|
0
|
518 (if (zerop total)
|
|
24
|
519 (or silent (message "Nothing to recover."))
|
|
0
|
520 (message "%d/%d file%s recovered." count total (if (= count 1) "" "s"))))
|
|
|
521 (if (get-buffer "*Directory*") (kill-buffer "*Directory*")))
|
|
|
522
|
|
24
|
523 ;;; end of auto-save.el
|
