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1 ;;; auto-save.el --- safer auto saving with support for ange-ftp and /tmp
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2
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3 (defconst auto-save-version "cvs ate me")
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4
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5 ;;;; Copyright (C) 1992, 1993, 1994 by Sebastian Kremer <sk@thp.uni-koeln.de>
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6 ;;;; Modified by jwz
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: Not in FSF.
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25
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26 ;;;; LISPDIR ENTRY for the Elisp Archive ===============================
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27 ;;;; LCD Archive Entry:
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28 ;;;; auto-save|Sebastian Kremer|sk@thp.uni-koeln.de
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29 ;;;; |safer auto saving with support for ange-ftp and /tmp
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30
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31 ;;;; OVERVIEW ==========================================================
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32
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33 ;;;; Combines autosaving for ange-ftp (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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38 ;;;; AUTOSAVE/#\!usr\!foo\!bar\!baz.txt#
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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 ;;;; Takes care that autosave files for non-file-buffers (e.g. *mail*)
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43 ;;;; from two simultaneous Emacses don't collide.
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44
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45 ;;;; Autosaves even if the current directory is not writable.
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46
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47 ;;;; Can limit autosave names to 14 characters using a hash function,
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48 ;;;; see `auto-save-hash-p'.
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49
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50 ;;;; See `auto-save-directory' and `make-auto-save-file-name' and
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51 ;;;; references therein for complete documentation.
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52
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53 ;;;; Meta-x recover-all-files will effectively do recover-file on all
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54 ;;;; files whose autosave file is newer (one of the benefits of having
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55 ;;;; all autosave files in the same place).
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56
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57 ;;;; INSTALLATION ======================================================
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58
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59 ;;;; Put this file into your load-path and the following in your ~/.emacs:
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60
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61 ;;;; If you want to autosave in the fixed directory /tmp/USER-autosave/
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62 ;;;; (setq auto-save-directory
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63 ;;;; (concat "/tmp/" (user-login-name) "-autosave/"))
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64
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65 ;;;; If you don't want to save in /tmp (e.g., because it is swap
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66 ;;;; mounted) but rather in ~/autosave/
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67 ;;;; (setq auto-save-directory (expand-file-name "~/autosave/"))
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68
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69 ;;;; If you want to save each file in its own directory (the default)
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70 ;;;; (setq auto-save-directory nil)
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71 ;;;; You still can take advantage of autosaving ange-ftp remote files
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72 ;;;; in a fixed local directory, `auto-save-directory-fallback' will
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73 ;;;; be used.
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74
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75 ;;;; If you want to use 14 character hashed autosave filenames
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76 ;;;; (setq auto-save-hash-p t)
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77
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78 ;;;; Finally, put this line after the others in your ~/.emacs:
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79 ;;;; (require 'auto-save)
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80
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81
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82 ;;;; ACKNOWLEDGEMENT ===================================================
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83
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84 ;;;; This code is loosely derived from autosave-in-tmp.el by Jamie
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85 ;;;; Zawinski <jwz@lucid.com> (the version I had was last modified 22
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86 ;;;; dec 90 jwz) and code submitted to ange-ftp-lovers on Sun, 5 Apr
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87 ;;;; 92 23:20:47 EDT by drw@BOURBAKI.MIT.EDU (Dale R. Worley).
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88 ;;;; auto-save.el tries to cover the functionality of those two
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89 ;;;; packages.
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90
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91 ;;;; Valuable comments and help from Dale Worley, Andy Norman, Jamie
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92 ;;;; Zawinski and Sandy Rutherford are gratefully acknowledged.
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93
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94 ;;;; CUSTOMIZATION =====================================================
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95
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96 (defvar auto-save-directory nil
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97
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98 ;;; Don't make this user-variable-p, it should be set in .emacs and
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99 ;;; left at that. In particular, it should remain constant across
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100 ;;; several Emacs session to make recover-all-files work.
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101
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102 "If non-nil, fixed directory for autosaving: all autosave files go
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103 there. If this directory does not yet exist at load time, it is
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104 created and its mode is set to 0700 so that nobody else can read your
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105 autosave files.
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106
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107 If nil, each autosave files goes into the same directory as its
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108 corresponding visited file.
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109
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110 A non-nil `auto-save-directory' could be on a local disk such as in
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111 /tmp, then auto-saves will always be fast, even if NFS or the
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112 automounter is slow. In the usual case of /tmp being locally mounted,
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113 note that if you run emacs on two different machines, they will not
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114 see each other's auto-save files.
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115
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116 The value \(expand-file-name \"~/autosave/\"\) might be better if /tmp
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117 is mounted from swap (possible in SunOS, type `df /tmp' to find out)
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118 and thus vanishes after a reboot, or if your system is particularly
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119 thorough when cleaning up /tmp, clearing even non-empty subdirectories.
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120
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121 It should never be an ange-ftp remote filename because that would
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122 defeat `ange-ftp-auto-save-remotely'.
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123
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124 Unless you set `auto-save-hash-p', you shouldn't set this to a
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125 directory in a filesystem that does not support long filenames, since
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126 a file named
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127
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128 /home/sk/lib/emacs/lisp/auto-save.el
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129
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130 will have a longish filename like
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131
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132 AUTO-SAVE-DIRECTORY/#\\!home\\!sk\\!lib\\!emacs\\!lisp\\!auto-save.el#
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133
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134 as auto save file.
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135
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136 See also variables `auto-save-directory-fallback', `auto-save-hash-p',
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137 `ange-ftp-auto-save' and `ange-ftp-auto-save-remotely'.")
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138
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139 (defvar auto-save-hash-p nil
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140 "If non-nil, hashed autosave names of length 14 are used.
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141 This is to avoid autosave filenames longer than 14 characters.
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142 The directory used is `auto-save-hash-directory' regardless of
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143 `auto-save-directory'.
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144 Hashing defeats `recover-all-files', you have to recover files
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145 individually by doing `recover-file'.")
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146
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147 ;;; This defvar is in ange-ftp.el now, but for older versions it
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148 ;;; doesn't hurt to give it here as well so that loading auto-save.el
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149 ;;; does not abort.
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150 (defvar ange-ftp-auto-save 0
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151 "If 1, allows ange-ftp files to be auto-saved.
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152 If 0, suppresses auto-saving of ange-ftp files.
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153 Don't use any other value.")
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154
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155 (defvar ange-ftp-auto-save-remotely nil
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156 "*If non-nil, causes the auto-save file for an ange-ftp file to be written in
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157 the remote directory containing the file, rather than in a local directory.
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158
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159 For remote files, this being true overrides a non-nil
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160 `auto-save-directory'. Local files are unaffected.
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161
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162 If you want to use this feature, you probably only want to set this
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163 true in a few buffers, rather than globally. You might want to give
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164 each buffer its own value using `make-variable-buffer-local'.
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165
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166 See also variable `ange-ftp-auto-save'.")
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167
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168 ;;;; end of customization
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169
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170
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171 ;;; Preparations to be done at load time
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172
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173 (defvar auto-save-directory-fallback (expand-file-name "~/autosave/")
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174 ;; not user-variable-p, see above
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175 "Directory used for local autosaving of remote files if
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176 both `auto-save-directory' and `ange-ftp-auto-save-remotely' are nil.
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177 Also used if a working directory to be used for autosaving is not writable.
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178 This *must* always be the name of directory that exists or can be
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179 created by you, never nil.")
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180
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181 (defvar auto-save-hash-directory
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182 (expand-file-name "hash/" (or auto-save-directory
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183 auto-save-directory-fallback))
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184 "If non-nil, directory used for hashed autosave filenames.")
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185
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186 (defun auto-save-check-directory (var)
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187 (let ((dir (symbol-value var)))
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188 (if (null dir)
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189 nil
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190 ;; Expand and store back into the variable
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191 (set var (setq dir (expand-file-name dir)))
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192 ;; Make sure directory exists
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193 (if (file-directory-p dir)
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194 nil
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195 ;; Else we create and chmod 0700 the directory
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196 (setq dir (directory-file-name dir)) ; some systems need this
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197 (if (fboundp 'make-directory) ; V19 or tree dired
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198 (make-directory dir)
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199 (call-process "mkdir" nil nil nil dir))
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200 ;; This is 1300, aka "d-wx-----T"
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201 ;; The sticky bit means that you can only delete your own files,
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202 ;; even if you have write permission in the directory (which is
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203 ;; moot, since the directory is only writable by owner.)
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204 (set-file-modes dir (* 7 8 8))))))
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205
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206 (mapcar (function auto-save-check-directory)
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207 '(auto-save-directory auto-save-directory-fallback))
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208
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209 (and auto-save-hash-p
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210 (auto-save-check-directory 'auto-save-hash-directory))
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211
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212
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213 ;;; Computing an autosave name for a file and vice versa
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214
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215 (defun make-auto-save-file-name ();; redefines files.el
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216 ;; auto-save-file-name-p need not be redefined.
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217
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218 "Return file name to use for auto-saves of current buffer.
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219 Does not consider `auto-save-visited-file-name'; that is checked
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220 before calling this function.
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221
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222 Offers to autosave all files in the same `auto-save-directory'. All
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223 autosave files can then be recovered at once with function
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224 `recover-all-files'.
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225
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226 Takes care to make autosave files for files accessed through ange-ftp
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227 be local files if variable `ange-ftp-auto-save-remotely' is nil.
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228
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229 Takes care of slashes in buffer names to prevent autosave errors.
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230
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231 Uses 14 character autosave names if `auto-save-hash-p' is true.
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232
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233 Autosaves even if the current directory is not writable, using
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234 directory `auto-save-directory-fallback'.
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235
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236 You can redefine this for customization (he he :-).
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237 See also function `auto-save-file-name-p'."
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238
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239 ;; We have to be very careful about not signalling an error in this
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240 ;; function since files.el does not provide for this (e.g. find-file
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241 ;; would fail for each new file).
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242
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243 (condition-case error-data
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244 (let* ((file-name (or (and (boundp 'buffer-file-truename) ; From jwz,
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245 buffer-file-truename) ; for Emacs 19?
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246 buffer-file-name))
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247 ;; So autosavename looks like #%...#, roughly as with the
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248 ;; old make-auto-save-file-name function. The
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249 ;; make-temp-name inserts the pid of this Emacs: this
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250 ;; avoids autosaving from two Emacses into the same file.
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251 ;; It cannot be recovered automatically then because in
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252 ;; the next Emacs session (the one after the crash) the
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253 ;; pid will be different, but file-less buffers like
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254 ;; *mail* must be recovered manually anyway.
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255
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256 ;; jwz: putting the emacs PID in the auto-save file name is bad
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257 ;; news, because that defeats auto-save-recovery of *mail*
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258 ;; buffers -- the (sensible) code in sendmail.el calls
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259 ;; (make-auto-save-file-name) to determine whether there is
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260 ;; unsent, auto-saved mail to recover. If that mail came from a
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261 ;; previous emacs process (far and away the most likely case)
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262 ;; then this can never succeed as the pid differs.
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263 ;; (name-prefix (if file-name nil (make-temp-name "#%")))
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264 (name-prefix (if file-name nil "#%"))
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265
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266 (save-name (or file-name
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267 ;; Prevent autosave errors. Buffername
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268 ;; (to become non-dir part of filename) will
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269 ;; be unslashified twice. Don't care.
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270 (auto-save-unslashify-name (buffer-name))))
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271 (remote-p (and (stringp file-name)
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272 (fboundp 'ange-ftp-ftp-path)
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273 (ange-ftp-ftp-path file-name))))
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274 ;; Return the appropriate auto save file name:
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275 (expand-file-name;; a buffername needs this, a filename not
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276 (if remote-p
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277 (if ange-ftp-auto-save-remotely
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278 (auto-save-name-in-same-directory save-name)
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279 ;; We have to use the `fixed-directory' now since the
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280 ;; `same-directory' would be remote.
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281 ;; It will use the fallback if needed.
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282 (auto-save-name-in-fixed-directory save-name))
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283 ;; Else it is a local file (or a buffer without a file, hence
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284 ;; the name-prefix).
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285 ;; Hashed files always go into the special hash dir, never
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286 ;; in the same directory, to make recognizing reliable.
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287 (if (or auto-save-directory auto-save-hash-p)
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288 (auto-save-name-in-fixed-directory save-name name-prefix)
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289 (auto-save-name-in-same-directory save-name name-prefix)))))
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290
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291 ;; If any error occurs in the above code, return what the old
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292 ;; version of this function would have done. It is not ok to
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293 ;; return nil, e.g., when after-find-file tests
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294 ;; file-newer-than-file-p, nil would bomb.
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295
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296 (error (progn
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297 (message "make-auto-save-file-name %s" error-data)
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298 (sit-for 2)
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299 (if buffer-file-name
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300 (concat (file-name-directory buffer-file-name)
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301 "#"
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302 (file-name-nondirectory buffer-file-name)
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303 "#")
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304 (expand-file-name (concat "#%" (buffer-name) "#")))))))
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305
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306 (defun auto-save-original-name (savename)
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307 "Reverse of `make-auto-save-file-name'.
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308 Returns nil if SAVENAME was not associated with a file (e.g., it came
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309 from an autosaved `*mail*' buffer) or does not appear to be an
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310 autosave file at all.
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311 Hashed files are not understood, see `auto-save-hash-p'."
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312 (let ((basename (file-name-nondirectory savename))
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313 (savedir (file-name-directory savename)))
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314 (cond ((or (not (auto-save-file-name-p basename))
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315 (string-match "^#%" basename))
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316 nil)
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317 ;; now we know it looks like #...# thus substring is safe to use
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318 ((or (equal savedir auto-save-directory) ; 2nd arg may be nil
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319 (equal savedir auto-save-directory-fallback))
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320 ;; it is of the `-fixed-directory' type
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321 (auto-save-slashify-name (substring basename 1 -1)))
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322 (t
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323 ;; else it is of `-same-directory' type
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324 (concat savedir (substring basename 1 -1))))))
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325
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326 (defun auto-save-name-in-fixed-directory (filename &optional prefix)
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327 ;; Unslashify and enclose the whole FILENAME in `#' to make an auto
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328 ;; save file in the auto-save-directory, or if that is nil, in
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329 ;; auto-save-directory-fallback (which must be the name of an
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330 ;; existing directory). If the results would be too long for 14
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331 ;; character filenames, and `auto-save-hash-p' is set, hash FILENAME
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332 ;; into a shorter name.
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333 ;; Optional PREFIX is string to use instead of "#" to prefix name.
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334 (let ((base-name (concat (or prefix "#")
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335 (auto-save-unslashify-name filename)
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336 "#")))
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337 (if (and auto-save-hash-p
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338 auto-save-hash-directory
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339 (> (length base-name) 14))
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340 (expand-file-name (auto-save-cyclic-hash-14 filename)
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341 auto-save-hash-directory)
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342 (expand-file-name base-name
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343 (or auto-save-directory
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344 auto-save-directory-fallback)))))
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345
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346 (defun auto-save-name-in-same-directory (filename &optional prefix)
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347 ;; Enclose the non-directory part of FILENAME in `#' to make an auto
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348 ;; save file in the same directory as FILENAME. But if this
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349 ;; directory is not writable, use auto-save-directory-fallback.
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350 ;; FILENAME is assumed to be in non-directory form (no trailing slash).
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351 ;; It may be a name without a directory part (pesumably it really
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352 ;; comes from a buffer name then), the fallback is used then.
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353 ;; Optional PREFIX is string to use instead of "#" to prefix name.
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354 (let ((directory (file-name-directory filename)))
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355 (or (null directory)
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356 (file-writable-p directory)
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357 (setq directory auto-save-directory-fallback))
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358 (concat directory ; (concat nil) is ""
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359 (or prefix "#")
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360 (file-name-nondirectory filename)
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361 "#")))
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362
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363 (defun auto-save-unslashify-name (s)
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364 ;; "Quote any slashes in string S by replacing them with the two
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365 ;;characters `\\!'.
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366 ;;Also, replace any backslash by double backslash, to make it one-to-one."
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367 (let ((limit 0))
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368 (while (string-match "[/\\]" s limit)
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369 (setq s (concat (substring s 0 (match-beginning 0))
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370 (if (string= (substring s
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371 (match-beginning 0)
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372 (match-end 0))
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373 "/")
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374 "\\!"
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375 "\\\\")
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376 (substring s (match-end 0))))
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377 (setq limit (1+ (match-end 0)))))
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378 s)
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379
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380 (defun auto-save-slashify-name (s)
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381 ;;"Reverse of `auto-save-unslashify-name'."
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382 (let (pos)
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383 (while (setq pos (string-match "\\\\[\\!]" s pos))
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384 (setq s (concat (substring s 0 pos)
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385 (if (eq ?! (aref s (1+ pos))) "/" "\\")
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386 (substring s (+ pos 2)))
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387 pos (1+ pos))))
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388 s)
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389
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390
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391 ;;; Hashing for autosave names
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392
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393 ;;; Hashing function contributed by Andy Norman <ange@hplb.hpl.hp.com>
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394 ;;; based upon C code from pot@fly.cnuce.cnr.IT (Francesco Potorti`).
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395
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396 (defun auto-save-cyclic-hash-14 (s)
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397 ;; "Hash string S into a string of length 14.
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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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400 (let ((crc (make-string 8 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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405 (setq new (+ new (aref crc 7)))
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406 (aset crc 7 (aref crc 6))
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407 (aset crc 6 (+ (aref crc 5) new))
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408 (aset crc 5 (aref crc 4))
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409 (aset crc 4 (aref crc 3))
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410 (aset crc 3 (+ (aref crc 2) new))
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411 (aset crc 2 (aref crc 1))
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412 (aset crc 1 (aref crc 0))
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413 (aset crc 0 new)))
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414 s)
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415 (setq result (format "%02x%02x%02x%02x%02x%02x%02x"
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416 (aref crc 0)
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417 (aref crc 1)
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418 (aref crc 2)
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419 (aref crc 3)
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420 (aref crc 4)
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421 (aref crc 5)
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422 (aref crc 6)
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423 (aref crc 7)))
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424 result))
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425
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426
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427
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428 ;;; Recovering files
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429
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430 ;; jwz: changed this to also offer to recover auto-saved buffers which
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431 ;; had no associated file name (such as sendmail buffers.)
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432 (defun recover-all-files ()
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433 "Do recover-file for all autosave files which are current.
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434 Only works if you have a non-nil `auto-save-directory'.
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435 Hashed files (see `auto-save-hash-p') are not understood, use
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436 `recover-file' to recover them individually."
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437 (interactive)
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438 (let ((savefiles (directory-files auto-save-directory t "^#"))
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439 afile ; the auto save file
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440 file ; its original file
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441 (total 0) ; # of files offered to recover
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442 (count 0)) ; # of files actually recovered
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443 (or (equal auto-save-directory auto-save-directory-fallback)
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444 (setq savefiles
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445 (append savefiles
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446 (directory-files auto-save-directory-fallback t "^#"))))
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447 (while savefiles
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448 (setq afile (car savefiles)
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449 file (auto-save-original-name afile)
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450 savefiles (cdr savefiles))
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451 (cond ((and file (not (file-newer-than-file-p afile file)))
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452 (message "autosave file \"%s\" is not current." afile)
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453 (sit-for 2))
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454 (t
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455 (setq total (1+ total))
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456 (with-output-to-temp-buffer "*Directory*"
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457 (apply 'call-process "ls" nil standard-output nil
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458 "-l" afile (if file (list file))))
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459 (if (yes-or-no-p (format "Recover %s from auto save file? "
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460 (or file "non-file buffer")))
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461 (let* ((obuf (current-buffer))
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462 (buf (set-buffer
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463 (if file
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464 (find-file-noselect file t)
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465 (generate-new-buffer "*recovered*"))))
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466 (buffer-read-only nil))
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467 (erase-buffer)
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468 (insert-file-contents afile nil)
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469 (condition-case ()
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470 (after-find-file nil)
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471 (error nil))
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472 (setq buffer-auto-save-file-name nil)
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473 (setq count (1+ count))
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474 (message "\
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475 Auto-save off in buffer \"%s\" till you do M-x auto-save-mode."
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476 (buffer-name))
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477 (set-buffer obuf)
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478 (sit-for 1))))))
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479 (if (zerop total)
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480 (message "Nothing to recover.")
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481 (message "%d/%d file%s recovered." count total (if (= count 1) "" "s"))))
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482 (if (get-buffer "*Directory*") (kill-buffer "*Directory*")))
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483
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484 (provide 'auto-save)
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