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1 ;;; uniquify.el --- unique buffer names dependent on file name
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108
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3 ;; Copyright (c) 1989, 1995, 1996, 1997 Free Software Foundation, Inc.
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4
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5 ;; Author: Dick King <king@reasoning.com>
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6 ;; Maintainer: Michael Ernst <mernst@theory.lcs.mit.edu>
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7 ;; Created: 15 May 86
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8 ;; Time-stamp: <97/03/03 17:16:23 mernst>
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9
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10 ;; This file is part of GNU Emacs.
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11
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12 ;; GNU Emacs is free software; you can redistribute it and/or modify
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13 ;; it under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; GNU Emacs is distributed in the hope that it will be useful,
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18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 ;; GNU 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 GNU Emacs; see the file COPYING. If not, write to
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24 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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25
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26 ;;; Commentary:
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27
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28 ;; Emacs's standard method for making buffer names unique adds <2>, <3>,
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29 ;; etc. to the end of (all but one of) the buffers. This file replaces
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30 ;; that behavior, for buffers visiting files and dired buffers, with a
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31 ;; uniquification that adds parts of the file name until the buffer names
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32 ;; are unique. For instance, buffers visiting /u/mernst/tmp/Makefile and
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33 ;; /usr/projects/zaphod/Makefile would be named Makefile|tmp and
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34 ;; Makefile|zaphod, respectively (instead of Makefile and Makefile<2>).
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35 ;; Other buffer name styles are also available.
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36
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37 ;; To use this file, just load it; or add (require 'uniquify) to your .emacs.
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38 ;; To disable it after loading, set variable uniquify-buffer-name-style to nil.
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39 ;; For other options, see "User-visible variables", below.
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40
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41 ;; uniquify.el works under Emacs 18, Emacs 19, XEmacs, and InfoDock.
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42
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43 ;; Doesn't correctly handle buffer names created by M-x write-file in Emacs 18.
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44 ;; Doesn't work under NT when backslash is used as a path separator (forward
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45 ;; slash path separator works fine). To fix, check system-type against
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46 ;; 'windows-nt, write a routine that breaks paths down into components.
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47 ;; (Surprisingly, there isn't one built in.)
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48
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49 ;;; Change Log:
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50
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51 ;; Originally by Dick King <king@reasoning.com> 15 May 86
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52 ;; Converted for Emacs 18 by Stephen Gildea <gildea@lcs.mit.edu>
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53 ;; Make uniquify-min-dir-content 0 truly non-invasive. gildea 23 May 89
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54 ;; Some cleanup. uniquify-min-dir-content default 0. gildea 01 Jun 89
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55 ;; Don't rename to "". Michael Ernst <mernst@theory.lcs.mit.edu> 15 Jun 94
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56 ;; Add kill-buffer-hook. Kenneth Manheimer <ken.manheimer@nist.gov> 09 May 95
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57 ;; Add advice for rename-buffer and create-file-buffer, handle dired buffers,
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58 ;; kill-buffer-rationalize-buffer-names-p, documentation. mernst 24 May 95
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59 ;; Remove free variables, fix typos. mernst 5 Jun 95
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60 ;; Efficiently support Emacs 19.27 & earlier. ken.manheimer, mernst 10 Jun 95
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61 ;; Rename user options to "uniquify-...", add uniquify-reverse-dir-content-p,
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62 ;; add uniquify-ask-about-buffer-names-p. king, mernst 13 Jun 95
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63 ;; Prefix functions by "uniquify-..."; rename mnemonic-buffer-names to
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64 ;; uniquify-buffer-name-style; add 'forward and 'post-forward-angle-brackets
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65 ;; styles; remove uniquify-reverse-dir-content-p; add
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66 ;; uniquify-trailing-separator-p. mernst 4 Aug 95
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67 ;; Don't call expand-file-name on nil. mernst 7 Jan 96
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68 ;; Check whether list-buffers-directory is bound. mernst 11 Oct 96
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69 ;; Ignore non-file non-dired buffers. Colin Rafferty <craffert@ml.com> 3 Mar 97
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70
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71 ;; Valuable feedback was provided by
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72 ;; Paul Smith <psmith@baynetworks.com>,
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73 ;; Alastair Burt <burt@dfki.uni-kl.de>,
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74 ;; Bob Weiner <weiner@footloose.sps.mot.com>,
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75 ;; Albert L. Ting <alt@vlibs.com>,
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76 ;; gyro@reasoning.com,
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77 ;; Bryan O'Sullivan <bos@eng.sun.com>.
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78
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79
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80 ;;; Code:
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81
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82 (provide 'uniquify)
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83
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84 ;;; User-visible variables
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85
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189
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86 (defgroup uniquify nil
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87 "Unique buffer names dependent on file name"
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88 :group 'applications)
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89
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90
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189
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91 (defcustom uniquify-buffer-name-style nil
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92 "*If non-nil, buffer names are uniquified with parts of directory name.
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93 The value determines the buffer name style and is one of `forward',
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94 `reverse', `post-forward' (the default), or `post-forward-angle-brackets'.
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95 For example, files `/foo/bar/mumble/name' and `/baz/quux/mumble/name'
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96 would have the following buffer names in the various styles:
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97 forward bar/mumble/name quux/mumble/name
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98 reverse name\\mumble\\bar name\\mumble\\quux
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99 post-forward name|bar/mumble name|quux/mumble
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100 post-forward-angle-brackets name<bar/mumble> name<quux/mumble>
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101 nil name name<2>"
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102 :type '(radio (const forward)
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103 (const reverse)
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104 (const post-forward)
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105 (const podt-forward-angle-brackets)
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106 (const nil))
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189
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107 :require 'uniquify
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134
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108 :group 'uniquify)
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109
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134
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110 (defcustom uniquify-after-kill-buffer-p nil
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111 "*If non-nil, rerationalize buffer names after a buffer has been killed.
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112 This can be dangerous if Emacs Lisp code is keeping track of buffers by their
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113 names (rather than keeping pointers to the buffers themselves)."
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114 :type 'boolean
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115 :group 'uniquify)
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116
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117 (defcustom uniquify-ask-about-buffer-names-p nil
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118 "*If non-nil, permit user to choose names for buffers with same base file.
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119 If the user chooses to name a buffer, uniquification is preempted and no
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120 other buffer names are changed."
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121 :type 'boolean
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122 :group 'uniquify)
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123
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134
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124 (defcustom uniquify-min-dir-content 0
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125 "*Minimum parts of directory name included in buffer name."
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126 :type 'integer
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127 :group 'uniquify)
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128
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129 (defcustom uniquify-separator nil
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130 "*String separator for buffer name components.
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131 When `uniquify-buffer-name-style' is `post-forward', separates
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132 base file name from directory part in buffer names (default \"|\").
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133 When `uniquify-buffer-name-style' is `reverse', separates all
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134
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134 file name components (default \"\\\")."
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135 :type '(choice (const nil) string)
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136 :group 'uniquify)
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137
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134
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138 (defcustom uniquify-trailing-separator-p nil
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139 "*If non-nil, add a file name separator to dired buffer names.
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140 If `uniquify-buffer-name-style' is `forward', add the separator at the end;
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141 if it is `reverse', add the separator at the beginning; otherwise, this
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134
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142 variable is ignored."
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143 :type 'boolean
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144 :group 'uniquify)
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145
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146
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147 ;;; Utilities
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148
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149 (defmacro uniquify-push (item list)
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150 (` (setq (, list) (cons (, item) (, list)))))
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151
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152 (defmacro uniquify-fix-list-base (a)
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153 (` (car (, a))))
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154
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155 (defmacro uniquify-fix-list-filename (a)
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156 (` (car (cdr (, a)))))
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157
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158 (defmacro uniquify-fix-list-buffer (a)
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159 (` (car (cdr (cdr (, a))))))
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160
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161 (defmacro uniquify-cadddr (a)
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162 (` (car (cdr (cdr (cdr (, a)))))))
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163
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164 ;; Internal variables used free
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165 (defvar uniquify-non-file-buffer-names nil)
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166 (defvar uniquify-possibly-resolvable nil)
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167
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168 ;;; Main entry point.
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169
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170 (defun uniquify-rationalize-file-buffer-names (&optional newbuffile newbuf)
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171 "Makes file buffer names unique by adding segments from file name.
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172 If `uniquify-min-dir-content' > 0, always pulls that many
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173 file name elements. Arguments cause only a subset of buffers to be renamed."
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174 (interactive)
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175 (let (fix-list
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176 uniquify-non-file-buffer-names
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177 (depth uniquify-min-dir-content))
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178 (let ((buffers (buffer-list)))
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179 (while buffers
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180 (let* ((buffer (car buffers))
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181 (bfn (if (eq buffer newbuf)
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182 (and newbuffile
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183 (expand-file-name newbuffile))
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184 (uniquify-buffer-file-name buffer)))
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185 (rawname (and bfn (file-name-nondirectory bfn)))
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186 (deserving (and rawname
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187 (or (not newbuffile)
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188 (equal rawname
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189 (file-name-nondirectory newbuffile))))))
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190 (if deserving
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191 (uniquify-push (list rawname bfn buffer nil) fix-list)
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192 (uniquify-push (list (buffer-name buffer))
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193 uniquify-non-file-buffer-names)))
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194 (setq buffers (cdr buffers))))
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195 ;; selects buffers whose names may need changing, and others that
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196 ;; may conflict.
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197 (setq fix-list
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198 (sort fix-list 'uniquify-fix-list-filename-lessp))
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199 ;; bringing conflicting names together
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200 (uniquify-rationalize-a-list fix-list depth)
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201 (mapcar 'uniquify-unrationalized-buffer fix-list)))
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202
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203 ;; uniquify's version of buffer-file-name
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204 (defun uniquify-buffer-file-name (buffer)
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205 "Return name of file BUFFER is visiting, or nil if none.
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206 Works on dired buffers as well as ordinary file-visiting buffers,
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207 but no others."
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208 (or (buffer-file-name buffer)
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209 (and (featurep 'dired)
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210 (save-excursion
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211 (set-buffer buffer)
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212 (and
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213 (eq major-mode 'dired-mode) ; do nothing if not a dired buffer
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214 (if (boundp 'list-buffers-directory) ; XEmacs mightn't define this
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215 list-buffers-directory
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216 ;; don't use default-directory if dired-directory is nil
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217 (and dired-directory
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218 (expand-file-name
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219 (directory-file-name
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220 (if (consp dired-directory)
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221 (car dired-directory)
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222 dired-directory))))))))))
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223
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224 (defun uniquify-fix-list-filename-lessp (fixlist1 fixlist2)
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225 (uniquify-filename-lessp
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226 (uniquify-fix-list-filename fixlist1) (uniquify-fix-list-filename fixlist2)))
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227
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228 ;; This examines the filename components in reverse order.
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229 (defun uniquify-filename-lessp (s1 s2)
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230 (let ((s1f (file-name-nondirectory s1))
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231 (s2f (file-name-nondirectory s2)))
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232 (and (not (equal s2f ""))
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233 (or (string-lessp s1f s2f)
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234 (and (equal s1f s2f)
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235 (let ((s1d (file-name-directory s1))
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236 (s2d (file-name-directory s2)))
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237 (and (not (<= (length s2d) 1))
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238 (or (<= (length s1d) 1)
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239 (uniquify-filename-lessp
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240 (substring s1d 0 -1)
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241 (substring s2d 0 -1))))))))))
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242
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243 ;; Was named do-the-buffers-you-couldnt-rationalize
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244 (defun uniquify-unrationalized-buffer (item)
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245 (or (uniquify-cadddr item) nil)) ;maybe better in the future
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246
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247 (defun uniquify-rationalize-a-list (fix-list depth)
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248 (let (conflicting-sublist
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249 (old-name "")
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250 proposed-name uniquify-possibly-resolvable)
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251 (while fix-list
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252 (let ((item (car fix-list)))
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253 (setq proposed-name (uniquify-get-proposed-name item depth))
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254 (if (not (equal proposed-name old-name))
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255 (progn
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256 (uniquify-rationalize-conflicting-sublist
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257 conflicting-sublist old-name depth)
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258 (setq conflicting-sublist nil)))
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259 (uniquify-push item conflicting-sublist)
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260 (setq old-name proposed-name))
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261 (setq fix-list (cdr fix-list)))
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262 (uniquify-rationalize-conflicting-sublist
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263 conflicting-sublist old-name depth)))
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264
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265 (defun uniquify-get-proposed-name (item depth)
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266 (let (index
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267 (extra-string "")
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268 (n depth)
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269 (base (uniquify-fix-list-base item))
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270 (fn (uniquify-fix-list-filename item)))
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271 (while (and (> n 0)
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272 (setq index (string-match
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273 (concat "\\(^\\|/[^/]*\\)/"
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274 (regexp-quote extra-string)
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275 (regexp-quote base)
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276 "\\'")
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277 fn)))
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278 (setq extra-string (substring fn
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279 (if (zerop index) 0 (1+ index))
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280 ;; (- (length base)) fails for base = "".
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281 ;; Equivalently, we could have used
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282 ;; (apply 'substring ...
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283 ;; (and (not (string= "" base))
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284 ;; (list (- (length base)))))
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285 (- (length fn) (length base)))
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286 n (1- n)))
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287 (if (zerop n) (setq uniquify-possibly-resolvable t))
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288
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289
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290 ;; Distinguish directories by adding extra separator.
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291 (if (and uniquify-trailing-separator-p
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292 (file-directory-p fn)
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293 (not (string-equal base "")))
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294 (cond ((eq uniquify-buffer-name-style 'forward)
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295 (setq base (concat base "/")))
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296 ((eq uniquify-buffer-name-style 'reverse)
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297 (setq base (concat (or uniquify-separator "\\") base)))))
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298
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299 ;; Trim trailing separator on directory part
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300 (if (and (not (string-equal extra-string ""))
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301 (or (eq uniquify-buffer-name-style 'post-forward)
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302 (eq uniquify-buffer-name-style 'post-forward-angle-brackets)))
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303 (setq extra-string (substring extra-string 0
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304 (- (length extra-string) 1))))
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305
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306 (cond ((string-equal extra-string "")
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307 base)
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308 ((string-equal base "")
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309 extra-string)
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310 ((eq uniquify-buffer-name-style 'forward)
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311 (concat extra-string base))
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312 ((eq uniquify-buffer-name-style 'reverse)
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313 (concat base (uniquify-reverse-components extra-string)))
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314 ((eq uniquify-buffer-name-style 'post-forward)
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315 (concat base (or uniquify-separator "|") extra-string))
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316 ((eq uniquify-buffer-name-style 'post-forward-angle-brackets)
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317 (concat base "<" extra-string ">"))
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318 (t (error "Bad value for uniquify-buffer-name-style: %s"
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319 uniquify-buffer-name-style)))))
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320
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321
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322 ;; Deal with conflicting-sublist, which is set by uniquify-rationalize-a-list.
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323 ;; This is only called by uniquify-rationalize-a-list.
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324 (defun uniquify-rationalize-conflicting-sublist (conflicting-sublist old-name depth)
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325 (or (null conflicting-sublist)
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326 (and (null (cdr conflicting-sublist))
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327 (not (assoc old-name uniquify-non-file-buffer-names))
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328 (or (and (not (string= old-name ""))
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329 (uniquify-rename-buffer (car conflicting-sublist) old-name))
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330 t))
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331 (if uniquify-possibly-resolvable
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332 (uniquify-rationalize-a-list conflicting-sublist (1+ depth)))))
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333
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334 (defun uniquify-rename-buffer (item newname)
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335 (let ((buffer (uniquify-fix-list-buffer item)))
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336 (if (not (equal newname (buffer-name buffer)))
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337 (let ((unset (current-buffer))
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338 ;; avoid hooks on rename-buffer
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339 (uniquify-buffer-name-style nil))
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340 (set-buffer buffer)
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341 (rename-buffer newname)
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342 (set-buffer unset))))
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343 (rplaca (nthcdr 3 item) t))
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344
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345 (defun uniquify-reverse-components (instring)
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346 (let ((sofar '())
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347 (cursor 0)
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348 (len (length instring))
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349 (sep (or uniquify-separator "\\")))
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350 (while (< cursor len)
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351 (if (= (aref instring cursor) ?/)
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352 (setq sofar (cons sep sofar)
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353 cursor (1+ cursor))
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354 (let ((first-slash (or (string-match "/" instring cursor) len)))
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355 (setq sofar (cons (substring instring cursor first-slash) sofar)
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356 cursor first-slash))))
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357 (apply (function concat) sofar)))
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358
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359
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360 ;;; Hooks from the rest of Emacs
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361
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189
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362 ;; The logical place to put all this code is in generate-new-buffer-name.
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363 ;; It's written in C, so we would add a generate-new-buffer-name-function
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364 ;; which, if non-nil, would be called instead of the C. One problem with
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365 ;; that is that generate-new-buffer-name takes a potential buffer name as
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366 ;; its argument -- not other information, such as what file the buffer will
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367 ;; visit.
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2
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368
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189
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369 ;; The below solution works because generate-new-buffer-name is called
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370 ;; only by rename-buffer (which, as of 19.29, is never called from C) and
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371 ;; generate-new-buffer, which is called only by Lisp functions
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372 ;; create-file-buffer and rename-uniquely. Rename-uniquely generally
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373 ;; isn't used for buffers visiting files, so it's sufficient to hook
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374 ;; rename-buffer and create-file-buffer. (Setting find-file-hooks isn't
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375 ;; sufficient.)
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2
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376
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189
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377 (defadvice rename-buffer (after rename-buffer-uniquify activate)
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378 "Uniquify buffer names with parts of directory name."
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379 (if (and uniquify-buffer-name-style
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380 ;; UNIQUE argument
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381 (ad-get-arg 1))
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382 (progn
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383 (if uniquify-after-kill-buffer-p
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384 ;; call with no argument; rationalize vs. old name as well as new
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385 (uniquify-rationalize-file-buffer-names)
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386 ;; call with argument: rationalize vs. new name only
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387 (uniquify-rationalize-file-buffer-names
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388 (uniquify-buffer-file-name (current-buffer)) (current-buffer)))
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389 (setq ad-return-value (buffer-name (current-buffer))))))
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2
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390
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189
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391 (defadvice create-file-buffer (after create-file-buffer-uniquify activate)
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392 "Uniquify buffer names with parts of directory name."
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393 (if uniquify-buffer-name-style
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394 (uniquify-rationalize-file-buffer-names (ad-get-arg 0) ad-return-value)))
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2
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395
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189
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396 ;; Buffer deletion
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397 ;; Rerationalize after a buffer is killed, to reduce coinciding buffer names.
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398 ;; This mechanism uses `kill-buffer-hook', which runs *before* deletion.
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399 ;; That means that the kill-buffer-hook function cannot just delete the
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400 ;; buffer -- it has to set something to do the rationalization *later*.
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401 ;; It actually puts another function on `post-command-hook'. This other
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402 ;; function runs the rationalization and then removes itself from the hook.
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403 ;; Is there a better way to accomplish this?
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404 ;; (This ought to set some global variables so the work is done only for
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405 ;; buffers with names similar to the deleted buffer. -MDE)
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2
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406
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189
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407 ;; Emacs 19.28 or later, or XEmacs (19.12 or later; is that necessary?)
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408 (defun delay-uniquify-rationalize-file-buffer-names ()
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409 "Add `delayed-uniquify-rationalize-file-buffer-names' to `post-command-hook'.
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410 For use on, eg, `kill-buffer-hook', to rationalize *after* buffer deletion."
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411 (if (and uniquify-buffer-name-style
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412 uniquify-after-kill-buffer-p)
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413 (add-hook 'post-command-hook
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414 'delayed-uniquify-rationalize-file-buffer-names)))
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2
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415
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189
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416 (defun delayed-uniquify-rationalize-file-buffer-names ()
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417 "Rerationalize buffer names and remove self from `post-command-hook'.
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418 See also `delay-rationalize-file-buffer-names' for hook setter."
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419 (uniquify-rationalize-file-buffer-names)
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420 (remove-hook 'post-command-hook
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421 'delayed-uniquify-rationalize-file-buffer-names))
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2
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422
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189
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423 (add-hook 'kill-buffer-hook 'delay-uniquify-rationalize-file-buffer-names)
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424
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2
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425
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426 ;;; uniquify.el ends here
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