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1 ;;; nnheaderxm.el --- making Gnus backends work under XEmacs
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2 ;; Copyright (C) 1996,97 Free Software Foundation, Inc.
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4 ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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5 ;; Keywords: news
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6
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7 ;; This file is part of GNU Emacs.
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8
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9 ;; GNU Emacs is free software; you can redistribute it and/or modify
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10 ;; it under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; GNU Emacs is distributed in the hope that it will be useful,
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15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 ;; GNU General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 ;; Boston, MA 02111-1307, USA.
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23
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24 ;;; Commentary:
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25
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26 ;;; Code:
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27
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28 (defun nnheader-xmas-run-at-time (time repeat function &rest args)
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29 (start-itimer
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30 "nnheader-run-at-time"
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31 `(lambda ()
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32 (,function ,@args))
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33 time repeat))
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34
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35 (defun nnheader-xmas-cancel-timer (timer)
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36 (delete-itimer timer))
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37
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38 (defun nnheader-xmas-cancel-function-timers (function)
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39 )
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40
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41 (defun nnheader-xmas-find-file-noselect (filename &optional nowarn rawfile)
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42 "Read file FILENAME into a buffer and return the buffer.
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43 If a buffer exists visiting FILENAME, return that one, but
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44 verify that the file has not changed since visited or saved.
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45 The buffer is not selected, just returned to the caller."
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46 (setq filename
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47 (abbreviate-file-name
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48 (expand-file-name filename)))
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49 (if (file-directory-p filename)
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50 (if find-file-run-dired
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51 (dired-noselect filename)
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52 (error "%s is a directory." filename))
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53 (let* ((buf (get-file-buffer filename))
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54 (truename (abbreviate-file-name (file-truename filename)))
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55 (number (nthcdr 10 (file-attributes truename)))
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56 ;; Find any buffer for a file which has same truename.
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57 (other (and (not buf)
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58 (get-file-buffer filename)))
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59 error)
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60 ;; Let user know if there is a buffer with the same truename.
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61 (when other
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62 (or nowarn
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63 (string-equal filename (buffer-file-name other))
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64 (message "%s and %s are the same file"
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65 filename (buffer-file-name other)))
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66 ;; Optionally also find that buffer.
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67 (when (or (and (boundp 'find-file-existing-other-name)
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68 find-file-existing-other-name)
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69 find-file-visit-truename)
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70 (setq buf other)))
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71 (if buf
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72 (or nowarn
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73 (verify-visited-file-modtime buf)
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74 (cond ((not (file-exists-p filename))
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75 (error "File %s no longer exists!" filename))
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76 ((yes-or-no-p
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77 (if (string= (file-name-nondirectory filename)
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78 (buffer-name buf))
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79 (format
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80 (if (buffer-modified-p buf)
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81 "File %s changed on disk. Discard your edits? "
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82 "File %s changed on disk. Reread from disk? ")
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83 (file-name-nondirectory filename))
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84 (format
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85 (if (buffer-modified-p buf)
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86 "File %s changed on disk. Discard your edits in %s? "
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87 "File %s changed on disk. Reread from disk into %s? ")
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88 (file-name-nondirectory filename)
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89 (buffer-name buf))))
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90 (save-excursion
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91 (set-buffer buf)
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92 (revert-buffer t t)))))
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93 (save-excursion
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94 ;;; The truename stuff makes this obsolete.
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95 ;;; (let* ((link-name (car (file-attributes filename)))
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96 ;;; (linked-buf (and (stringp link-name)
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97 ;;; (get-file-buffer link-name))))
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98 ;;; (if (bufferp linked-buf)
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99 ;;; (message "Symbolic link to file in buffer %s"
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100 ;;; (buffer-name linked-buf))))
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101 (setq buf (create-file-buffer filename))
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102 ;; (set-buffer-major-mode buf)
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103 (set-buffer buf)
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104 (erase-buffer)
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105 (if rawfile
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106 (condition-case ()
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107 (nnheader-insert-file-contents filename t)
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108 (file-error
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109 ;; Unconditionally set error
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110 (setq error t)))
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111 (condition-case ()
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112 (insert-file-contents filename t)
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113 (file-error
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114 ;; Run find-file-not-found-hooks until one returns non-nil.
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115 (or t ; (run-hook-with-args-until-success 'find-file-not-found-hooks)
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116 ;; If they fail too, set error.
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117 (setq error t)))))
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118 ;; Find the file's truename, and maybe use that as visited name.
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119 (setq buffer-file-truename truename)
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120 (setq buffer-file-number number)
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121 ;; On VMS, we may want to remember which directory in a search list
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122 ;; the file was found in.
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123 (and (eq system-type 'vax-vms)
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124 (let (logical)
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125 (when (string-match ":" (file-name-directory filename))
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126 (setq logical (substring (file-name-directory filename)
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127 0 (match-beginning 0))))
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128 (not (member logical find-file-not-true-dirname-list)))
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129 (setq buffer-file-name buffer-file-truename))
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130 (when find-file-visit-truename
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131 (setq buffer-file-name
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132 (setq filename
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133 (expand-file-name buffer-file-truename))))
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134 ;; Set buffer's default directory to that of the file.
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135 (setq default-directory (file-name-directory filename))
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136 ;; Turn off backup files for certain file names. Since
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137 ;; this is a permanent local, the major mode won't eliminate it.
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138 (when (not (funcall backup-enable-predicate buffer-file-name))
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139 (make-local-variable 'backup-inhibited)
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140 (setq backup-inhibited t))
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141 (if rawfile
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142 nil
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143 (after-find-file error (not nowarn)))))
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144 buf)))
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145
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146 (fset 'nnheader-run-at-time 'nnheader-xmas-run-at-time)
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147 (fset 'nnheader-cancel-timer 'nnheader-xmas-cancel-timer)
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148 (fset 'nnheader-cancel-function-timers 'nnheader-xmas-cancel-function-timers)
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149 (fset 'nnheader-find-file-noselect 'nnheader-xmas-find-file-noselect)
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150
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151 (provide 'nnheaderxm)
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152
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153 ;;; nnheaderxm.el ends here.
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