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526baa41 LMI |
1 | ;;; nnheaderems.el --- making Gnus backends work under different Emacsen |
2 | ;; Copyright (C) 1996 Free Software Foundation, Inc. | |
3 | ||
4 | ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no> | |
5 | ;; Keywords: news | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation; either version 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
23 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;;; Code: | |
27 | ||
28 | (defun nnheader-xmas-run-at-time (time repeat function &rest args) | |
29 | (start-itimer | |
30 | "nnheader-run-at-time" | |
31 | `(lambda () | |
32 | (,function ,@args)) | |
33 | time repeat)) | |
34 | ||
35 | (defun nnheader-xmas-cancel-timer (timer) | |
36 | (delete-itimer timer)) | |
37 | ||
38 | ;; Written by Erik Naggum <erik@naggum.no>. | |
39 | ;; Saved by Steve Baur <steve@miranova.com>. | |
40 | (defun nnheader-xmas-insert-file-contents-literally (filename &optional visit beg end replace) | |
41 | "Like `insert-file-contents', q.v., but only reads in the file. | |
42 | A buffer may be modified in several ways after reading into the buffer due | |
43 | to advanced Emacs features, such as file-name-handlers, format decoding, | |
44 | find-file-hooks, etc. | |
45 | This function ensures that none of these modifications will take place." | |
46 | (let ( ; (file-name-handler-alist nil) | |
47 | (format-alist nil) | |
48 | (after-insert-file-functions nil) | |
49 | (find-buffer-file-type-function | |
50 | (if (fboundp 'find-buffer-file-type) | |
51 | (symbol-function 'find-buffer-file-type) | |
52 | nil))) | |
53 | (unwind-protect | |
54 | (progn | |
55 | (fset 'find-buffer-file-type (lambda (filename) t)) | |
56 | (insert-file-contents filename visit beg end replace)) | |
57 | (if find-buffer-file-type-function | |
58 | (fset 'find-buffer-file-type find-buffer-file-type-function) | |
59 | (fmakunbound 'find-buffer-file-type))))) | |
60 | ||
61 | (defun nnheader-xmas-find-file-noselect (filename &optional nowarn rawfile) | |
62 | "Read file FILENAME into a buffer and return the buffer. | |
63 | If a buffer exists visiting FILENAME, return that one, but | |
64 | verify that the file has not changed since visited or saved. | |
65 | The buffer is not selected, just returned to the caller." | |
66 | (setq filename | |
67 | (abbreviate-file-name | |
68 | (expand-file-name filename))) | |
69 | (if (file-directory-p filename) | |
70 | (if find-file-run-dired | |
71 | (dired-noselect filename) | |
72 | (error "%s is a directory." filename)) | |
73 | (let* ((buf (get-file-buffer filename)) | |
74 | (truename (abbreviate-file-name (file-truename filename))) | |
75 | (number (nthcdr 10 (file-attributes truename))) | |
76 | ;; Find any buffer for a file which has same truename. | |
77 | (other (and (not buf) | |
78 | (if (fboundp 'find-buffer-visiting) | |
79 | (find-buffer-visiting filename) | |
80 | (get-file-buffer filename)))) | |
81 | error) | |
82 | ;; Let user know if there is a buffer with the same truename. | |
83 | (if other | |
84 | (progn | |
85 | (or nowarn | |
86 | (string-equal filename (buffer-file-name other)) | |
87 | (message "%s and %s are the same file" | |
88 | filename (buffer-file-name other))) | |
89 | ;; Optionally also find that buffer. | |
90 | (if (or (and (boundp 'find-file-existing-other-name) | |
91 | find-file-existing-other-name) | |
92 | find-file-visit-truename) | |
93 | (setq buf other)))) | |
94 | (if buf | |
95 | (or nowarn | |
96 | (verify-visited-file-modtime buf) | |
97 | (cond ((not (file-exists-p filename)) | |
98 | (error "File %s no longer exists!" filename)) | |
99 | ((yes-or-no-p | |
100 | (if (string= (file-name-nondirectory filename) | |
101 | (buffer-name buf)) | |
102 | (format | |
103 | (if (buffer-modified-p buf) | |
104 | "File %s changed on disk. Discard your edits? " | |
105 | "File %s changed on disk. Reread from disk? ") | |
106 | (file-name-nondirectory filename)) | |
107 | (format | |
108 | (if (buffer-modified-p buf) | |
109 | "File %s changed on disk. Discard your edits in %s? " | |
110 | "File %s changed on disk. Reread from disk into %s? ") | |
111 | (file-name-nondirectory filename) | |
112 | (buffer-name buf)))) | |
113 | (save-excursion | |
114 | (set-buffer buf) | |
115 | (revert-buffer t t))))) | |
116 | (save-excursion | |
117 | ;;; The truename stuff makes this obsolete. | |
118 | ;;; (let* ((link-name (car (file-attributes filename))) | |
119 | ;;; (linked-buf (and (stringp link-name) | |
120 | ;;; (get-file-buffer link-name)))) | |
121 | ;;; (if (bufferp linked-buf) | |
122 | ;;; (message "Symbolic link to file in buffer %s" | |
123 | ;;; (buffer-name linked-buf)))) | |
124 | (setq buf (create-file-buffer filename)) | |
125 | ;; (set-buffer-major-mode buf) | |
126 | (set-buffer buf) | |
127 | (erase-buffer) | |
128 | (if rawfile | |
129 | (condition-case () | |
130 | (nnheader-insert-file-contents-literally filename t) | |
131 | (file-error | |
132 | ;; Unconditionally set error | |
133 | (setq error t))) | |
134 | (condition-case () | |
135 | (insert-file-contents filename t) | |
136 | (file-error | |
137 | ;; Run find-file-not-found-hooks until one returns non-nil. | |
138 | (or t ; (run-hook-with-args-until-success 'find-file-not-found-hooks) | |
139 | ;; If they fail too, set error. | |
140 | (setq error t))))) | |
141 | ;; Find the file's truename, and maybe use that as visited name. | |
142 | (setq buffer-file-truename truename) | |
143 | (setq buffer-file-number number) | |
144 | ;; On VMS, we may want to remember which directory in a search list | |
145 | ;; the file was found in. | |
146 | (and (eq system-type 'vax-vms) | |
147 | (let (logical) | |
148 | (if (string-match ":" (file-name-directory filename)) | |
149 | (setq logical (substring (file-name-directory filename) | |
150 | 0 (match-beginning 0)))) | |
151 | (not (member logical find-file-not-true-dirname-list))) | |
152 | (setq buffer-file-name buffer-file-truename)) | |
153 | (if find-file-visit-truename | |
154 | (setq buffer-file-name | |
155 | (setq filename | |
156 | (expand-file-name buffer-file-truename)))) | |
157 | ;; Set buffer's default directory to that of the file. | |
158 | (setq default-directory (file-name-directory filename)) | |
159 | ;; Turn off backup files for certain file names. Since | |
160 | ;; this is a permanent local, the major mode won't eliminate it. | |
161 | (and (not (funcall backup-enable-predicate buffer-file-name)) | |
162 | (progn | |
163 | (make-local-variable 'backup-inhibited) | |
164 | (setq backup-inhibited t))) | |
165 | (if rawfile | |
166 | nil | |
167 | (after-find-file error (not nowarn))))) | |
168 | buf))) | |
169 | ||
170 | (defun nnheader-ms-strip-cr () | |
171 | "Strip ^M from the end of all lines." | |
172 | (save-excursion | |
173 | (goto-char (point-min)) | |
174 | (while (re-search-forward "\r$" nil t) | |
175 | (delete-backward-char 1)))) | |
176 | ||
177 | (eval-and-compile | |
178 | (cond | |
179 | ;; Do XEmacs function bindings. | |
180 | ((string-match "XEmacs\\|Lucid" emacs-version) | |
181 | (fset 'nnheader-run-at-time 'nnheader-xmas-run-at-time) | |
182 | (fset 'nnheader-cancel-timer 'nnheader-xmas-cancel-timer) | |
183 | (fset 'nnheader-find-file-noselect 'nnheader-xmas-find-file-noselect) | |
184 | (fset 'nnheader-insert-file-contents-literally | |
185 | (if (fboundp 'insert-file-contents-literally) | |
186 | 'insert-file-contents-literally | |
187 | 'nnheader-xmas-insert-file-contents-literally))) | |
188 | ;; Do Emacs function bindings. | |
189 | (t | |
190 | (fset 'nnheader-run-at-time 'run-at-time) | |
191 | (fset 'nnheader-cancel-timer 'cancel-timer) | |
192 | (fset 'nnheader-find-file-noselect 'find-file-noselect) | |
193 | (fset 'nnheader-insert-file-contents-literally | |
194 | 'insert-file-contents-literally) | |
195 | )) | |
196 | (when (memq system-type '(windows-nt)) | |
197 | (add-hook 'nnmail-prepare-incoming-hook 'nnheader-ms-strip-cr))) | |
198 | ||
199 | (provide 'nnheaderems) | |
200 | ||
201 | ;;; nnheaderems.el ends here. |