HCoop / bpt / emacs.git / blame
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|---|---|---|
| c0274f38 ER |
1 | ;;; files.el --- file input and output commands for Emacs |
| 2 | ||
| 18cf9502 | 3 | ;; Copyright (C) 1985, 86, 87, 92, 93, 94 Free Software Foundation, Inc. |
| b4da00e9 | 4 | |
| 3a801d0c ER |
5 | ;; Maintainer: FSF |
| 6 | ||
| b4da00e9 RM |
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 | |
| e5167999 | 11 | ;; the Free Software Foundation; either version 2, or (at your option) |
| b4da00e9 RM |
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 | |
| 21 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 22 | ||
| e41b2db1 ER |
23 | ;;; Commentary: |
| 24 | ||
| 25 | ;; Defines most of Emacs's file- and directory-handling functions, | |
| 26 | ;; including basic file visiting, backup generation, link handling, | |
| 27 | ;; ITS-id version control, load- and write-hook handling, and the like. | |
| 28 | ||
| e5167999 ER |
29 | ;;; Code: |
| 30 | ||
| b4da00e9 RM |
31 | (defconst delete-auto-save-files t |
| 32 | "*Non-nil means delete a buffer's auto-save file when the buffer is saved.") | |
| 33 | ||
| 34 | (defconst directory-abbrev-alist | |
| 35 | nil | |
| 36 | "*Alist of abbreviations for file directories. | |
| 37 | A list of elements of the form (FROM . TO), each meaning to replace | |
| 38 | FROM with TO when it appears in a directory name. This replacement is | |
| 39 | done when setting up the default directory of a newly visited file. | |
| 40 | *Every* FROM string should start with `^'. | |
| 41 | ||
| 65151a1b RS |
42 | Do not use `~' in the TO strings. |
| 43 | They should be ordinary absolute directory names. | |
| 44 | ||
| b4da00e9 RM |
45 | Use this feature when you have directories which you normally refer to |
| 46 | via absolute symbolic links. Make TO the name of the link, and FROM | |
| 47 | the name it is linked to.") | |
| 48 | ||
| 49 | ;;; Turn off backup files on VMS since it has version numbers. | |
| 50 | (defconst make-backup-files (not (eq system-type 'vax-vms)) | |
| 4ea836c1 | 51 | "*Non-nil means make a backup of a file the first time it is saved. |
| b4da00e9 RM |
52 | This can be done by renaming the file or by copying. |
| 53 | ||
| 54 | Renaming means that Emacs renames the existing file so that it is a | |
| 55 | backup file, then writes the buffer into a new file. Any other names | |
| 56 | that the old file had will now refer to the backup file. The new file | |
| 57 | is owned by you and its group is defaulted. | |
| 58 | ||
| 59 | Copying means that Emacs copies the existing file into the backup | |
| 60 | file, then writes the buffer on top of the existing file. Any other | |
| 61 | names that the old file had will now refer to the new (edited) file. | |
| 62 | The file's owner and group are unchanged. | |
| 63 | ||
| 64 | The choice of renaming or copying is controlled by the variables | |
| 65 | `backup-by-copying', `backup-by-copying-when-linked' and | |
| f862241d | 66 | `backup-by-copying-when-mismatch'. See also `backup-inhibited'.") |
| b4da00e9 RM |
67 | |
| 68 | ;; Do this so that local variables based on the file name | |
| 69 | ;; are not overridden by the major mode. | |
| 70 | (defvar backup-inhibited nil | |
| f862241d RS |
71 | "Non-nil means don't make a backup, regardless of the other parameters. |
| 72 | This variable is intended for use by making it local to a buffer. | |
| 73 | But it is local only if you make it local.") | |
| b4da00e9 RM |
74 | (put 'backup-inhibited 'permanent-local t) |
| 75 | ||
| 76 | (defconst backup-by-copying nil | |
| 77 | "*Non-nil means always use copying to create backup files. | |
| 78 | See documentation of variable `make-backup-files'.") | |
| 79 | ||
| 80 | (defconst backup-by-copying-when-linked nil | |
| 81 | "*Non-nil means use copying to create backups for files with multiple names. | |
| 82 | This causes the alternate names to refer to the latest version as edited. | |
| 83 | This variable is relevant only if `backup-by-copying' is nil.") | |
| 84 | ||
| 85 | (defconst backup-by-copying-when-mismatch nil | |
| 86 | "*Non-nil means create backups by copying if this preserves owner or group. | |
| 87 | Renaming may still be used (subject to control of other variables) | |
| 88 | when it would not result in changing the owner or group of the file; | |
| 89 | that is, for files which are owned by you and whose group matches | |
| 90 | the default for a new file created there by you. | |
| 91 | This variable is relevant only if `backup-by-copying' is nil.") | |
| 92 | ||
| 93 | (defvar backup-enable-predicate | |
| 94 | '(lambda (name) | |
| 95 | (or (< (length name) 5) | |
| 96 | (not (string-equal "/tmp/" (substring name 0 5))))) | |
| 97 | "Predicate that looks at a file name and decides whether to make backups. | |
| 98 | Called with an absolute file name as argument, it returns t to enable backup.") | |
| 99 | ||
| 100 | (defconst buffer-offer-save nil | |
| 101 | "*Non-nil in a buffer means offer to save the buffer on exit | |
| 102 | even if the buffer is not visiting a file. | |
| 103 | Automatically local in all buffers.") | |
| 104 | (make-variable-buffer-local 'buffer-offer-save) | |
| 105 | ||
| f3e23606 RS |
106 | (defconst find-file-existing-other-name nil |
| 107 | "*Non-nil means find a file under alternative names, in existing buffers. | |
| 108 | This means if any existing buffer is visiting the file you want | |
| 109 | under another name, you get the existing buffer instead of a new buffer.") | |
| 110 | ||
| 111 | (defconst find-file-visit-truename nil | |
| 112 | "*Non-nil means visit a file under its truename. | |
| 113 | The truename of a file is found by chasing all links | |
| 114 | both at the file level and at the levels of the containing directories.") | |
| 115 | ||
| 116 | (defvar buffer-file-truename nil | |
| 7d806fcd KH |
117 | "The abbreviated truename of the file visited in the current buffer. |
| 118 | That is, (abbreviated-file-name (file-truename buffer-file-name)). | |
| f3e23606 RS |
119 | This variable is automatically local in all buffers, when non-nil.") |
| 120 | (make-variable-buffer-local 'buffer-file-truename) | |
| 121 | (put 'buffer-file-truename 'permanent-local t) | |
| 122 | ||
| 123 | (defvar buffer-file-number nil | |
| 124 | "The device number and file number of the file visited in the current buffer. | |
| 125 | The value is a list of the form (FILENUM DEVNUM). | |
| 126 | This pair of numbers uniquely identifies the file. | |
| 127 | If the buffer is visiting a new file, the value is nil.") | |
| 128 | (make-variable-buffer-local 'buffer-file-number) | |
| 129 | (put 'buffer-file-number 'permanent-local t) | |
| 130 | ||
| b4da00e9 RM |
131 | (defconst file-precious-flag nil |
| 132 | "*Non-nil means protect against I/O errors while saving files. | |
| 133 | Some modes set this non-nil in particular buffers.") | |
| 134 | ||
| 135 | (defvar version-control nil | |
| 136 | "*Control use of version numbers for backup files. | |
| 137 | t means make numeric backup versions unconditionally. | |
| 138 | nil means make them for files that have some already. | |
| 139 | never means do not make them.") | |
| 140 | ||
| 141 | (defvar dired-kept-versions 2 | |
| 142 | "*When cleaning directory, number of versions to keep.") | |
| 143 | ||
| 144 | (defvar trim-versions-without-asking nil | |
| 6d74b528 ER |
145 | "*If t, deletes excess backup versions silently. |
| 146 | If nil, asks confirmation. Any other value prevents any trimming.") | |
| b4da00e9 RM |
147 | |
| 148 | (defvar kept-old-versions 2 | |
| 149 | "*Number of oldest versions to keep when a new numbered backup is made.") | |
| 150 | ||
| 151 | (defvar kept-new-versions 2 | |
| 152 | "*Number of newest versions to keep when a new numbered backup is made. | |
| 153 | Includes the new backup. Must be > 0") | |
| 154 | ||
| 155 | (defconst require-final-newline nil | |
| 156 | "*Value of t says silently ensure a file ends in a newline when it is saved. | |
| 157 | Non-nil but not t says ask user whether to add a newline when there isn't one. | |
| 158 | nil means don't add newlines.") | |
| 159 | ||
| 160 | (defconst auto-save-default t | |
| 161 | "*Non-nil says by default do auto-saving of every file-visiting buffer.") | |
| 162 | ||
| 163 | (defconst auto-save-visited-file-name nil | |
| 164 | "*Non-nil says auto-save a buffer in the file it is visiting, when practical. | |
| 165 | Normally auto-save files are written under other names.") | |
| 166 | ||
| 167 | (defconst save-abbrevs nil | |
| 168 | "*Non-nil means save word abbrevs too when files are saved. | |
| 169 | Loading an abbrev file sets this to t.") | |
| 170 | ||
| 171 | (defconst find-file-run-dired t | |
| 320b4233 | 172 | "*Non-nil says run dired if `find-file' is given the name of a directory.") |
| b4da00e9 | 173 | |
| 92966e6f RS |
174 | ;;;It is not useful to make this a local variable. |
| 175 | ;;;(put 'find-file-not-found-hooks 'permanent-local t) | |
| b4da00e9 RM |
176 | (defvar find-file-not-found-hooks nil |
| 177 | "List of functions to be called for `find-file' on nonexistent file. | |
| 178 | These functions are called as soon as the error is detected. | |
| 179 | `buffer-file-name' is already set up. | |
| 180 | The functions are called in the order given until one of them returns non-nil.") | |
| 181 | ||
| 92966e6f RS |
182 | ;;;It is not useful to make this a local variable. |
| 183 | ;;;(put 'find-file-hooks 'permanent-local t) | |
| b4da00e9 RM |
184 | (defvar find-file-hooks nil |
| 185 | "List of functions to be called after a buffer is loaded from a file. | |
| 186 | The buffer's local variables (if any) will have been processed before the | |
| 187 | functions are called.") | |
| 188 | ||
| b4da00e9 RM |
189 | (defvar write-file-hooks nil |
| 190 | "List of functions to be called before writing out a buffer to a file. | |
| 191 | If one of them returns non-nil, the file is considered already written | |
| 8c0e7b73 JB |
192 | and the rest are not called. |
| 193 | These hooks are considered to pertain to the visited file. | |
| 194 | So this list is cleared if you change the visited file name. | |
| c9dca4e0 RS |
195 | See also `write-contents-hooks'. |
| 196 | Don't make this variable buffer-local; instead, use `local-write-file-hooks'.") | |
| b19f1da4 BF |
197 | ;;; However, in case someone does make it local... |
| 198 | (put 'write-file-hooks 'permanent-local t) | |
| c9dca4e0 | 199 | |
| c9dca4e0 RS |
200 | (defvar local-write-file-hooks nil |
| 201 | "Just like `write-file-hooks', except intended for per-buffer use. | |
| 202 | The functions in this list are called before the ones in | |
| 203 | `write-file-hooks'.") | |
| b19f1da4 BF |
204 | (make-variable-buffer-local 'local-write-file-hooks) |
| 205 | (put 'local-write-file-hooks 'permanent-local t) | |
| 8c0e7b73 JB |
206 | |
| 207 | (defvar write-contents-hooks nil | |
| 208 | "List of functions to be called before writing out a buffer to a file. | |
| 209 | If one of them returns non-nil, the file is considered already written | |
| 210 | and the rest are not called. | |
| 211 | These hooks are considered to pertain to the buffer's contents, | |
| 212 | not to the particular visited file; thus, `set-visited-file-name' does | |
| 213 | not clear this variable, but changing the major mode does clear it. | |
| 214 | See also `write-file-hooks'.") | |
| b4da00e9 RM |
215 | |
| 216 | (defconst enable-local-variables t | |
| 217 | "*Control use of local-variables lists in files you visit. | |
| 218 | The value can be t, nil or something else. | |
| 219 | A value of t means local-variables lists are obeyed; | |
| 220 | nil means they are ignored; anything else means query. | |
| 221 | ||
| 222 | The command \\[normal-mode] always obeys local-variables lists | |
| 223 | and ignores this variable.") | |
| 224 | ||
| 2bba782c | 225 | (defconst enable-local-eval 'maybe |
| d207b766 RS |
226 | "*Control processing of the \"variable\" `eval' in a file's local variables. |
| 227 | The value can be t, nil or something else. | |
| 228 | A value of t means obey `eval' variables; | |
| 229 | nil means ignore them; anything else means query. | |
| 230 | ||
| 231 | The command \\[normal-mode] always obeys local-variables lists | |
| 232 | and ignores this variable.") | |
| b4da00e9 RM |
233 | |
| 234 | ;; Avoid losing in versions where CLASH_DETECTION is disabled. | |
| 235 | (or (fboundp 'lock-buffer) | |
| 231c4e10 | 236 | (defalias 'lock-buffer 'ignore)) |
| b4da00e9 | 237 | (or (fboundp 'unlock-buffer) |
| 231c4e10 | 238 | (defalias 'unlock-buffer 'ignore)) |
| 93fe0a35 RS |
239 | |
| 240 | ;; This hook function provides support for ange-ftp host name | |
| 241 | ;; completion. It runs the usual ange-ftp hook, but only for | |
| 242 | ;; completion operations. Having this here avoids the need | |
| 243 | ;; to load ange-ftp when it's not really in use. | |
| 244 | (defun ange-ftp-completion-hook-function (op &rest args) | |
| 245 | (if (memq op '(file-name-completion file-name-all-completions)) | |
| 246 | (apply 'ange-ftp-hook-function op args) | |
| 247 | (let (file-name-handler-alist) | |
| 248 | (apply op args)))) | |
| b4da00e9 RM |
249 | \f |
| 250 | (defun pwd () | |
| 251 | "Show the current default directory." | |
| 252 | (interactive nil) | |
| 253 | (message "Directory %s" default-directory)) | |
| 254 | ||
| 231c4e10 ER |
255 | (defvar cd-path nil |
| 256 | "Value of the CDPATH environment variable, as a list. | |
| 257 | Not actually set up until the first time you you use it.") | |
| 258 | ||
| 259 | (defun parse-colon-path (cd-path) | |
| 260 | "Explode a colon-separated list of paths into a string list." | |
| 261 | (and cd-path | |
| 262 | (let (cd-prefix cd-list (cd-start 0) cd-colon) | |
| 263 | (setq cd-path (concat cd-path ":")) | |
| 264 | (while (setq cd-colon (string-match ":" cd-path cd-start)) | |
| 265 | (setq cd-list | |
| 9daefb36 | 266 | (nconc cd-list |
| c52e4104 RS |
267 | (list (if (= cd-start cd-colon) |
| 268 | nil | |
| 269 | (substitute-in-file-name | |
| e33e80e4 RS |
270 | (file-name-as-directory |
| 271 | (substring cd-path cd-start cd-colon))))))) | |
| 231c4e10 ER |
272 | (setq cd-start (+ cd-colon 1))) |
| 273 | cd-list))) | |
| 274 | ||
| 275 | (defun cd-absolute (dir) | |
| 30c5ce9c | 276 | "Change current directory to given absolute file name DIR." |
| b3c4423b | 277 | (setq dir (abbreviate-file-name (expand-file-name dir))) |
| b4da00e9 RM |
278 | (if (not (eq system-type 'vax-vms)) |
| 279 | (setq dir (file-name-as-directory dir))) | |
| 280 | (if (not (file-directory-p dir)) | |
| 281 | (error "%s is not a directory" dir) | |
| 282 | (if (file-executable-p dir) | |
| 283 | (setq default-directory dir) | |
| 9daefb36 | 284 | (error "Cannot cd to %s: Permission denied" dir)))) |
| b4da00e9 | 285 | |
| 231c4e10 ER |
286 | (defun cd (dir) |
| 287 | "Make DIR become the current buffer's default directory. | |
| 30c5ce9c RS |
288 | If your environment includes a `CDPATH' variable, try each one of that |
| 289 | colon-separated list of directories when resolving a relative directory name." | |
| 231c4e10 | 290 | (interactive "FChange default directory: ") |
| 30c5ce9c RS |
291 | (if (file-name-absolute-p dir) |
| 292 | (cd-absolute (expand-file-name dir)) | |
| 293 | (if (null cd-path) | |
| 294 | (let ((trypath (parse-colon-path (getenv "CDPATH")))) | |
| 295 | (setq cd-path (or trypath (list "./"))))) | |
| 296 | (if (not (catch 'found | |
| 297 | (mapcar | |
| 298 | (function (lambda (x) | |
| 299 | (let ((f (expand-file-name (concat x dir)))) | |
| 300 | (if (file-directory-p f) | |
| 301 | (progn | |
| 302 | (cd-absolute f) | |
| 303 | (throw 'found t)))))) | |
| 304 | cd-path) | |
| 305 | nil)) | |
| 306 | (error "No such directory found via CDPATH environment variable")))) | |
| 231c4e10 | 307 | |
| b4da00e9 RM |
308 | (defun load-file (file) |
| 309 | "Load the Lisp file named FILE." | |
| 310 | (interactive "fLoad file: ") | |
| 311 | (load (expand-file-name file) nil nil t)) | |
| 312 | ||
| 313 | (defun load-library (library) | |
| 314 | "Load the library named LIBRARY. | |
| 315 | This is an interface to the function `load'." | |
| 316 | (interactive "sLoad library: ") | |
| 317 | (load library)) | |
| 5d68c2c2 RS |
318 | |
| 319 | ;; OTHER is the other file to be compared. | |
| 320 | (defun file-local-copy (file) | |
| 321 | "Copy the file FILE into a temporary file on this machine. | |
| 322 | Returns the name of the local copy, or nil, if FILE is directly | |
| 323 | accessible." | |
| 5dbfdacd | 324 | (let ((handler (find-file-name-handler file))) |
| 5d68c2c2 RS |
325 | (if handler |
| 326 | (funcall handler 'file-local-copy file) | |
| 327 | nil))) | |
| f3e23606 RS |
328 | |
| 329 | (defun file-truename (filename) | |
| 330 | "Return the truename of FILENAME, which should be absolute. | |
| 331 | The truename of a file name is found by chasing symbolic links | |
| 332 | both at the level of the file and at the level of the directories | |
| 333 | containing it, until no links are left at any level." | |
| 7a5a26a6 RS |
334 | (if (or (string= filename "~") |
| 335 | (and (string= (substring filename 0 1) "~") | |
| 336 | (string-match "~[^/]*" filename))) | |
| 1cc2fbeb RS |
337 | (progn |
| 338 | (setq filename (expand-file-name filename)) | |
| 339 | (if (string= filename "") | |
| 340 | (setq filename "/")))) | |
| 5dbfdacd | 341 | (let ((handler (find-file-name-handler filename))) |
| 6f176f94 RS |
342 | ;; For file name that has a special handler, call handler. |
| 343 | ;; This is so that ange-ftp can save time by doing a no-op. | |
| 344 | (if handler | |
| 345 | (funcall handler 'file-truename filename) | |
| 346 | (let ((dir (file-name-directory filename)) | |
| 347 | target dirfile) | |
| 348 | ;; Get the truename of the directory. | |
| 349 | (setq dirfile (directory-file-name dir)) | |
| 350 | ;; If these are equal, we have the (or a) root directory. | |
| 351 | (or (string= dir dirfile) | |
| 352 | (setq dir (file-name-as-directory (file-truename dirfile)))) | |
| c3bf10c2 RS |
353 | (if (equal ".." (file-name-nondirectory filename)) |
| 354 | (directory-file-name (file-name-directory (directory-file-name dir))) | |
| 355 | (if (equal "." (file-name-nondirectory filename)) | |
| 356 | (directory-file-name dir) | |
| 357 | ;; Put it back on the file name. | |
| 358 | (setq filename (concat dir (file-name-nondirectory filename))) | |
| 359 | ;; Is the file name the name of a link? | |
| 360 | (setq target (file-symlink-p filename)) | |
| 361 | (if target | |
| 362 | ;; Yes => chase that link, then start all over | |
| 363 | ;; since the link may point to a directory name that uses links. | |
| 364 | ;; We can't safely use expand-file-name here | |
| 365 | ;; since target might look like foo/../bar where foo | |
| 366 | ;; is itself a link. Instead, we handle . and .. above. | |
| 367 | (if (file-name-absolute-p target) | |
| 368 | (file-truename target) | |
| 369 | (file-truename (concat dir target))) | |
| 370 | ;; No, we are done! | |
| 371 | filename))))))) | |
| 5dbfdacd | 372 | |
| 5dadeb29 RS |
373 | (defun file-chase-links (filename) |
| 374 | "Chase links in FILENAME until a name that is not a link. | |
| 375 | Does not examine containing directories for links, | |
| 376 | unlike `file-truename'." | |
| 377 | (let (tem (count 100) (newname filename)) | |
| 378 | (while (setq tem (file-symlink-p newname)) | |
| 379 | (if (= count 0) | |
| 380 | (error "Apparent cycle of symbolic links for %s" filename)) | |
| cf65b429 RS |
381 | ;; Handle `..' by hand, since it needs to work in the |
| 382 | ;; target of any directory symlink. | |
| 383 | ;; This code is not quite complete; it does not handle | |
| 384 | ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose. | |
| 385 | (while (string-match "\\.\\./" tem) | |
| 386 | (setq tem (substring tem 3)) | |
| 387 | (setq newname (file-name-as-directory | |
| 388 | ;; Do the .. by hand. | |
| 389 | (directory-file-name | |
| 390 | (file-name-directory | |
| 391 | ;; Chase links in the default dir of the symlink. | |
| 392 | (file-chase-links | |
| 393 | (directory-file-name | |
| 394 | (file-name-directory newname)))))))) | |
| 5dadeb29 RS |
395 | (setq newname (expand-file-name tem (file-name-directory newname))) |
| 396 | (setq count (1- count))) | |
| 397 | newname)) | |
| b4da00e9 RM |
398 | \f |
| 399 | (defun switch-to-buffer-other-window (buffer) | |
| 400 | "Select buffer BUFFER in another window." | |
| 401 | (interactive "BSwitch to buffer in other window: ") | |
| 402 | (let ((pop-up-windows t)) | |
| 403 | (pop-to-buffer buffer t))) | |
| 404 | ||
| f98955ea JB |
405 | (defun switch-to-buffer-other-frame (buffer) |
| 406 | "Switch to buffer BUFFER in another frame." | |
| 407 | (interactive "BSwitch to buffer in other frame: ") | |
| 408 | (let ((pop-up-frames t)) | |
| 2be5e5db | 409 | (pop-to-buffer buffer t))) |
| 5bbbceb1 | 410 | |
| b4da00e9 RM |
411 | (defun find-file (filename) |
| 412 | "Edit file FILENAME. | |
| 413 | Switch to a buffer visiting file FILENAME, | |
| 414 | creating one if none already exists." | |
| 415 | (interactive "FFind file: ") | |
| 416 | (switch-to-buffer (find-file-noselect filename))) | |
| 417 | ||
| 418 | (defun find-file-other-window (filename) | |
| 419 | "Edit file FILENAME, in another window. | |
| 420 | May create a new window, or reuse an existing one. | |
| 421 | See the function `display-buffer'." | |
| 422 | (interactive "FFind file in other window: ") | |
| 423 | (switch-to-buffer-other-window (find-file-noselect filename))) | |
| 424 | ||
| f98955ea JB |
425 | (defun find-file-other-frame (filename) |
| 426 | "Edit file FILENAME, in another frame. | |
| 427 | May create a new frame, or reuse an existing one. | |
| 5bbbceb1 | 428 | See the function `display-buffer'." |
| f98955ea JB |
429 | (interactive "FFind file in other frame: ") |
| 430 | (switch-to-buffer-other-frame (find-file-noselect filename))) | |
| 5bbbceb1 | 431 | |
| b4da00e9 RM |
432 | (defun find-file-read-only (filename) |
| 433 | "Edit file FILENAME but don't allow changes. | |
| 434 | Like \\[find-file] but marks buffer as read-only. | |
| 435 | Use \\[toggle-read-only] to permit editing." | |
| 436 | (interactive "fFind file read-only: ") | |
| 437 | (find-file filename) | |
| 320b4233 RS |
438 | (setq buffer-read-only t) |
| 439 | (current-buffer)) | |
| b4da00e9 RM |
440 | |
| 441 | (defun find-file-read-only-other-window (filename) | |
| 442 | "Edit file FILENAME in another window but don't allow changes. | |
| 443 | Like \\[find-file-other-window] but marks buffer as read-only. | |
| 444 | Use \\[toggle-read-only] to permit editing." | |
| 445 | (interactive "fFind file read-only other window: ") | |
| 9466a1f6 | 446 | (find-file-other-window filename) |
| 320b4233 RS |
447 | (setq buffer-read-only t) |
| 448 | (current-buffer)) | |
| b4da00e9 | 449 | |
| f98955ea JB |
450 | (defun find-file-read-only-other-frame (filename) |
| 451 | "Edit file FILENAME in another frame but don't allow changes. | |
| 452 | Like \\[find-file-other-frame] but marks buffer as read-only. | |
| 5bbbceb1 | 453 | Use \\[toggle-read-only] to permit editing." |
| f98955ea JB |
454 | (interactive "fFind file read-only other frame: ") |
| 455 | (find-file-other-frame filename) | |
| 320b4233 RS |
456 | (setq buffer-read-only t) |
| 457 | (current-buffer)) | |
| 5bbbceb1 | 458 | |
| b4da00e9 RM |
459 | (defun find-alternate-file (filename) |
| 460 | "Find file FILENAME, select its buffer, kill previous buffer. | |
| 461 | If the current buffer now contains an empty file that you just visited | |
| 462 | \(presumably by mistake), use this command to visit the file you really want." | |
| 463 | (interactive | |
| 464 | (let ((file buffer-file-name) | |
| 465 | (file-name nil) | |
| 466 | (file-dir nil)) | |
| 467 | (and file | |
| 468 | (setq file-name (file-name-nondirectory file) | |
| 469 | file-dir (file-name-directory file))) | |
| a61f59b4 JA |
470 | (list (read-file-name |
| 471 | "Find alternate file: " file-dir nil nil file-name)))) | |
| b4da00e9 RM |
472 | (and (buffer-modified-p) |
| 473 | ;; (not buffer-read-only) | |
| 474 | (not (yes-or-no-p (format "Buffer %s is modified; kill anyway? " | |
| 475 | (buffer-name)))) | |
| 476 | (error "Aborted")) | |
| 477 | (let ((obuf (current-buffer)) | |
| 478 | (ofile buffer-file-name) | |
| 8bb27285 RS |
479 | (onum buffer-file-number) |
| 480 | (otrue buffer-file-truename) | |
| b4da00e9 RM |
481 | (oname (buffer-name))) |
| 482 | (rename-buffer " **lose**") | |
| 483 | (setq buffer-file-name nil) | |
| 8bb27285 RS |
484 | (setq buffer-file-number nil) |
| 485 | (setq buffer-file-truename nil) | |
| b4da00e9 RM |
486 | (unwind-protect |
| 487 | (progn | |
| 488 | (unlock-buffer) | |
| 489 | (find-file filename)) | |
| 490 | (cond ((eq obuf (current-buffer)) | |
| 491 | (setq buffer-file-name ofile) | |
| 8bb27285 RS |
492 | (setq buffer-file-number onum) |
| 493 | (setq buffer-file-truename otrue) | |
| b4da00e9 RM |
494 | (lock-buffer) |
| 495 | (rename-buffer oname)))) | |
| 496 | (or (eq (current-buffer) obuf) | |
| 497 | (kill-buffer obuf)))) | |
| 498 | ||
| 499 | (defun create-file-buffer (filename) | |
| 500 | "Create a suitably named buffer for visiting FILENAME, and return it. | |
| 501 | FILENAME (sans directory) is used unchanged if that name is free; | |
| 502 | otherwise a string <2> or <3> or ... is appended to get an unused name." | |
| 503 | (let ((lastname (file-name-nondirectory filename))) | |
| 504 | (if (string= lastname "") | |
| 505 | (setq lastname filename)) | |
| 506 | (generate-new-buffer lastname))) | |
| 507 | ||
| 5bbbceb1 JB |
508 | (defun generate-new-buffer (name) |
| 509 | "Create and return a buffer with a name based on NAME. | |
| 29165787 | 510 | Choose the buffer's name using `generate-new-buffer-name'." |
| 5bbbceb1 JB |
511 | (get-buffer-create (generate-new-buffer-name name))) |
| 512 | ||
| e373f201 JB |
513 | (defconst automount-dir-prefix "^/tmp_mnt/" |
| 514 | "Regexp to match the automounter prefix in a directory name.") | |
| 515 | ||
| ffb3a4db | 516 | (defvar abbreviated-home-dir nil |
| 292297c6 | 517 | "The user's homedir abbreviated according to `directory-abbrev-list'.") |
| ffb3a4db | 518 | |
| 5bbbceb1 | 519 | (defun abbreviate-file-name (filename) |
| 29165787 | 520 | "Return a version of FILENAME shortened using `directory-abbrev-alist'. |
| 5bbbceb1 | 521 | This also substitutes \"~\" for the user's home directory. |
| 29165787 | 522 | Type \\[describe-variable] directory-abbrev-alist RET for more information." |
| e373f201 JB |
523 | ;; Get rid of the prefixes added by the automounter. |
| 524 | (if (and (string-match automount-dir-prefix filename) | |
| 525 | (file-exists-p (file-name-directory | |
| 526 | (substring filename (1- (match-end 0)))))) | |
| 527 | (setq filename (substring filename (1- (match-end 0))))) | |
| 5bbbceb1 | 528 | (let ((tail directory-abbrev-alist)) |
| ffb3a4db RS |
529 | ;; If any elt of directory-abbrev-alist matches this name, |
| 530 | ;; abbreviate accordingly. | |
| 5bbbceb1 JB |
531 | (while tail |
| 532 | (if (string-match (car (car tail)) filename) | |
| 533 | (setq filename | |
| 534 | (concat (cdr (car tail)) (substring filename (match-end 0))))) | |
| 535 | (setq tail (cdr tail))) | |
| ffb3a4db RS |
536 | ;; Compute and save the abbreviated homedir name. |
| 537 | ;; We defer computing this until the first time it's needed, to | |
| 538 | ;; give time for directory-abbrev-alist to be set properly. | |
| e98dda89 RS |
539 | ;; We include a slash at the end, to avoid spurious matches |
| 540 | ;; such as `/usr/foobar' when the home dir is `/usr/foo'. | |
| ffb3a4db RS |
541 | (or abbreviated-home-dir |
| 542 | (setq abbreviated-home-dir | |
| 543 | (let ((abbreviated-home-dir "$foo")) | |
| 3a8a836d RS |
544 | (concat "^" (abbreviate-file-name (expand-file-name "~")) |
| 545 | "\\(/\\|$\\)")))) | |
| 546 | ||
| ffb3a4db RS |
547 | ;; If FILENAME starts with the abbreviated homedir, |
| 548 | ;; make it start with `~' instead. | |
| ca33ccb5 RS |
549 | (if (and (string-match abbreviated-home-dir filename) |
| 550 | ;; If the home dir is just /, don't change it. | |
| 551 | (not (and (= (match-end 0) 1) | |
| 552 | (= (aref filename 0) ?/)))) | |
| 5bbbceb1 | 553 | (setq filename |
| 28dbf501 JB |
554 | (concat "~" |
| 555 | ;; If abbreviated-home-dir ends with a slash, | |
| 556 | ;; don't remove the corresponding slash from | |
| 557 | ;; filename. On MS-DOS and OS/2, you can have | |
| 558 | ;; home directories like "g:/", in which it is | |
| 559 | ;; important not to remove the slash. And what | |
| 560 | ;; about poor root on Unix systems? | |
| 561 | (if (eq ?/ (aref abbreviated-home-dir | |
| 562 | (1- (length abbreviated-home-dir)))) | |
| 563 | "/" | |
| 564 | "") | |
| 3a8a836d | 565 | (substring filename (match-beginning 1) (match-end 1)) |
| 28dbf501 | 566 | (substring filename (match-end 0))))) |
| 5bbbceb1 JB |
567 | filename)) |
| 568 | ||
| 1770543d RS |
569 | (defvar find-file-not-true-dirname-list nil |
| 570 | "*List of logical names for which visiting shouldn't save the true dirname. | |
| 571 | On VMS, when you visit a file using a logical name that searches a path, | |
| 572 | you may or may not want the visited file name to record the specific | |
| 573 | directory where the file was found. If you *do not* want that, add the logical | |
| 574 | name to this list as a string.") | |
| 575 | ||
| 138c44f6 KH |
576 | (defun find-buffer-visiting (filename) |
| 577 | "Return the buffer visiting file FILENAME (a string). | |
| 578 | This is like `get-file-buffer', except that it checks for any buffer | |
| 579 | visiting the same file, possibly under a different name. | |
| 580 | If there is no such live buffer, return nil." | |
| 581 | (let ((buf (get-file-buffer filename)) | |
| 582 | (truename (abbreviate-file-name (file-truename filename)))) | |
| 583 | (or buf | |
| 584 | (let ((list (buffer-list)) found) | |
| 585 | (while (and (not found) list) | |
| 586 | (save-excursion | |
| 587 | (set-buffer (car list)) | |
| 588 | (if (and buffer-file-name | |
| 589 | (string= buffer-file-truename truename)) | |
| 590 | (setq found (car list)))) | |
| 591 | (setq list (cdr list))) | |
| 592 | found) | |
| 0f933cf6 | 593 | (let ((number (nthcdr 10 (file-attributes truename))) |
| 138c44f6 | 594 | (list (buffer-list)) found) |
| 181c830f RS |
595 | (and number |
| 596 | (while (and (not found) list) | |
| 597 | (save-excursion | |
| 598 | (set-buffer (car list)) | |
| 599 | (if (and (equal buffer-file-number number) | |
| 600 | ;; Verify this buffer's file number | |
| 601 | ;; still belongs to its file. | |
| 602 | (file-exists-p buffer-file-name) | |
| 603 | (equal (nthcdr 10 (file-attributes buffer-file-name)) | |
| 604 | number)) | |
| 605 | (setq found (car list)))) | |
| 606 | (setq list (cdr list)))) | |
| 138c44f6 KH |
607 | found)))) |
| 608 | ||
| b4da00e9 RM |
609 | (defun find-file-noselect (filename &optional nowarn) |
| 610 | "Read file FILENAME into a buffer and return the buffer. | |
| 611 | If a buffer exists visiting FILENAME, return that one, but | |
| 612 | verify that the file has not changed since visited or saved. | |
| 613 | The buffer is not selected, just returned to the caller." | |
| e373f201 JB |
614 | (setq filename |
| 615 | (abbreviate-file-name | |
| 616 | (expand-file-name filename))) | |
| b4da00e9 RM |
617 | (if (file-directory-p filename) |
| 618 | (if find-file-run-dired | |
| 619 | (dired-noselect filename) | |
| 620 | (error "%s is a directory." filename)) | |
| f3e23606 RS |
621 | (let* ((buf (get-file-buffer filename)) |
| 622 | (truename (abbreviate-file-name (file-truename filename))) | |
| 623 | (number (nthcdr 10 (file-attributes truename))) | |
| 624 | ;; Find any buffer for a file which has same truename. | |
| 138c44f6 | 625 | (other (and (not buf) (find-buffer-visiting filename))) |
| f3e23606 RS |
626 | error) |
| 627 | ;; Let user know if there is a buffer with the same truename. | |
| 138c44f6 KH |
628 | (if other |
| 629 | (progn | |
| 630 | (or nowarn (message "%s and %s are the same file" | |
| 631 | filename (buffer-file-name other))) | |
| 632 | ;; Optionally also find that buffer. | |
| 633 | (if (or find-file-existing-other-name find-file-visit-truename) | |
| 634 | (setq buf other)))) | |
| b4da00e9 RM |
635 | (if buf |
| 636 | (or nowarn | |
| 637 | (verify-visited-file-modtime buf) | |
| 638 | (cond ((not (file-exists-p filename)) | |
| 639 | (error "File %s no longer exists!" filename)) | |
| 640 | ((yes-or-no-p | |
| 641 | (format | |
| 642 | (if (buffer-modified-p buf) | |
| 643 | "File %s changed on disk. Discard your edits? " | |
| 644 | "File %s changed on disk. Read the new version? ") | |
| 645 | (file-name-nondirectory filename))) | |
| 646 | (save-excursion | |
| 647 | (set-buffer buf) | |
| 648 | (revert-buffer t t))))) | |
| 649 | (save-excursion | |
| f3e23606 RS |
650 | ;;; The truename stuff makes this obsolete. |
| 651 | ;;; (let* ((link-name (car (file-attributes filename))) | |
| 652 | ;;; (linked-buf (and (stringp link-name) | |
| 653 | ;;; (get-file-buffer link-name)))) | |
| 654 | ;;; (if (bufferp linked-buf) | |
| 655 | ;;; (message "Symbolic link to file in buffer %s" | |
| 656 | ;;; (buffer-name linked-buf)))) | |
| b4da00e9 RM |
657 | (setq buf (create-file-buffer filename)) |
| 658 | (set-buffer buf) | |
| 659 | (erase-buffer) | |
| 660 | (condition-case () | |
| 661 | (insert-file-contents filename t) | |
| 662 | (file-error | |
| 663 | (setq error t) | |
| 664 | ;; Run find-file-not-found-hooks until one returns non-nil. | |
| 665 | (let ((hooks find-file-not-found-hooks)) | |
| 666 | (while (and hooks | |
| 455d9d28 RS |
667 | (not (and (funcall (car hooks)) |
| 668 | ;; If a hook succeeded, clear error. | |
| 669 | (progn (setq error nil) | |
| 670 | ;; Also exit the loop. | |
| 671 | t)))) | |
| b4da00e9 | 672 | (setq hooks (cdr hooks)))))) |
| f3e23606 | 673 | ;; Find the file's truename, and maybe use that as visited name. |
| 138c44f6 | 674 | (setq buffer-file-truename truename) |
| 1770543d RS |
675 | (setq buffer-file-number number) |
| 676 | ;; On VMS, we may want to remember which directory in a search list | |
| 677 | ;; the file was found in. | |
| 678 | (and (eq system-type 'vax-vms) | |
| 679 | (let (logical) | |
| 680 | (if (string-match ":" (file-name-directory filename)) | |
| 681 | (setq logical (substring (file-name-directory filename) | |
| 682 | 0 (match-beginning 0)))) | |
| 683 | (not (member logical find-file-not-true-dirname-list))) | |
| 684 | (setq buffer-file-name buffer-file-truename)) | |
| 1cc2fbeb | 685 | (if find-file-visit-truename |
| 27d0420c RS |
686 | (setq buffer-file-name |
| 687 | (setq filename | |
| 688 | (expand-file-name buffer-file-truename)))) | |
| b4da00e9 RM |
689 | ;; Set buffer's default directory to that of the file. |
| 690 | (setq default-directory (file-name-directory filename)) | |
| 691 | ;; Turn off backup files for certain file names. Since | |
| 692 | ;; this is a permanent local, the major mode won't eliminate it. | |
| 693 | (and (not (funcall backup-enable-predicate buffer-file-name)) | |
| 694 | (progn | |
| 695 | (make-local-variable 'backup-inhibited) | |
| 696 | (setq backup-inhibited t))) | |
| 697 | (after-find-file error (not nowarn)))) | |
| 698 | buf))) | |
| 699 | \f | |
| 8cfb9d46 | 700 | (defun after-find-file (&optional error warn noauto) |
| b4da00e9 RM |
701 | "Called after finding a file and by the default revert function. |
| 702 | Sets buffer mode, parses local variables. | |
| 8cfb9d46 | 703 | Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an |
| b4da00e9 RM |
704 | error in reading the file. WARN non-nil means warn if there |
| 705 | exists an auto-save file more recent than the visited file. | |
| 8cfb9d46 | 706 | NOAUTO means don't mess with auto-save mode. |
| b4da00e9 RM |
707 | Finishes by calling the functions in `find-file-hooks'." |
| 708 | (setq buffer-read-only (not (file-writable-p buffer-file-name))) | |
| 709 | (if noninteractive | |
| 710 | nil | |
| 711 | (let* (not-serious | |
| 712 | (msg | |
| 713 | (cond ((and error (file-attributes buffer-file-name)) | |
| 714 | (setq buffer-read-only t) | |
| ff78d520 | 715 | "File exists, but cannot be read.") |
| b4da00e9 RM |
716 | ((not buffer-read-only) |
| 717 | (if (and warn | |
| 718 | (file-newer-than-file-p (make-auto-save-file-name) | |
| 719 | buffer-file-name)) | |
| 720 | "Auto save file is newer; consider M-x recover-file" | |
| 721 | (setq not-serious t) | |
| 722 | (if error "(New file)" nil))) | |
| 723 | ((not error) | |
| 724 | (setq not-serious t) | |
| 725 | "Note: file is write protected") | |
| 726 | ((file-attributes (directory-file-name default-directory)) | |
| 727 | "File not found and directory write-protected") | |
| 4e43240a RS |
728 | ((file-exists-p (file-name-directory buffer-file-name)) |
| 729 | (setq buffer-read-only nil)) | |
| b4da00e9 | 730 | (t |
| 5bbbceb1 | 731 | (setq buffer-read-only nil) |
| 4e43240a RS |
732 | (if (file-exists-p (file-name-directory (directory-file-name (file-name-directory buffer-file-name)))) |
| 733 | "Use M-x make-dir RET RET to create the directory" | |
| 734 | "Use C-u M-x make-dir RET RET to create directory and its parents"))))) | |
| b4da00e9 RM |
735 | (if msg |
| 736 | (progn | |
| 737 | (message msg) | |
| 738 | (or not-serious (sit-for 1 nil t))))) | |
| 8cfb9d46 | 739 | (if (and auto-save-default (not noauto)) |
| b4da00e9 RM |
740 | (auto-save-mode t))) |
| 741 | (normal-mode t) | |
| 742 | (mapcar 'funcall find-file-hooks)) | |
| 743 | ||
| 744 | (defun normal-mode (&optional find-file) | |
| 745 | "Choose the major mode for this buffer automatically. | |
| 746 | Also sets up any specified local variables of the file. | |
| 747 | Uses the visited file name, the -*- line, and the local variables spec. | |
| 748 | ||
| 749 | This function is called automatically from `find-file'. In that case, | |
| 750 | we may set up specified local variables depending on the value of | |
| 751 | `enable-local-variables': if it is t, we do; if it is nil, we don't; | |
| 752 | otherwise, we query. `enable-local-variables' is ignored if you | |
| 753 | run `normal-mode' explicitly." | |
| 754 | (interactive) | |
| 755 | (or find-file (funcall (or default-major-mode 'fundamental-mode))) | |
| 756 | (condition-case err | |
| 757 | (set-auto-mode) | |
| 758 | (error (message "File mode specification error: %s" | |
| 759 | (prin1-to-string err)))) | |
| 760 | (condition-case err | |
| 7b3f3dc2 JB |
761 | (let ((enable-local-variables (or (not find-file) |
| 762 | enable-local-variables))) | |
| 763 | (hack-local-variables)) | |
| b4da00e9 RM |
764 | (error (message "File local-variables error: %s" |
| 765 | (prin1-to-string err))))) | |
| 766 | ||
| 7b3f3dc2 JB |
767 | (defvar auto-mode-alist (mapcar 'purecopy |
| 768 | '(("\\.text\\'" . text-mode) | |
| 769 | ("\\.c\\'" . c-mode) | |
| 770 | ("\\.h\\'" . c-mode) | |
| 771 | ("\\.tex\\'" . TeX-mode) | |
| 772 | ("\\.ltx\\'" . LaTeX-mode) | |
| 773 | ("\\.el\\'" . emacs-lisp-mode) | |
| 774 | ("\\.mm\\'" . nroff-mode) | |
| 775 | ("\\.me\\'" . nroff-mode) | |
| c80d2575 ER |
776 | ("\\.ms\\'" . nroff-mode) |
| 777 | ("\\.man\\'" . nroff-mode) | |
| 7b3f3dc2 JB |
778 | ("\\.scm\\'" . scheme-mode) |
| 779 | ("\\.l\\'" . lisp-mode) | |
| 780 | ("\\.lisp\\'" . lisp-mode) | |
| 781 | ("\\.f\\'" . fortran-mode) | |
| 782 | ("\\.for\\'" . fortran-mode) | |
| e70991d4 RS |
783 | ("\\.p\\'" . pascal-mode) |
| 784 | ("\\.pas\\'" . pascal-mode) | |
| 7b3f3dc2 JB |
785 | ("\\.mss\\'" . scribe-mode) |
| 786 | ("\\.pl\\'" . prolog-mode) | |
| 787 | ("\\.cc\\'" . c++-mode) | |
| 2b845a8c | 788 | ("\\.hh\\'" . c++-mode) |
| 7b3f3dc2 | 789 | ("\\.C\\'" . c++-mode) |
| 2b845a8c | 790 | ("\\.H\\'" . c++-mode) |
| a3666e47 RS |
791 | ;;; ("\\.mk\\'" . makefile-mode) |
| 792 | ;;; ("[Mm]akefile" . makefile-mode) | |
| 7b3f3dc2 JB |
793 | ;;; Less common extensions come here |
| 794 | ;;; so more common ones above are found faster. | |
| 7ca1d903 RS |
795 | ("\\.texinfo\\'" . texinfo-mode) |
| 796 | ("\\.texi\\'" . texinfo-mode) | |
| 7b3f3dc2 JB |
797 | ("\\.s\\'" . asm-mode) |
| 798 | ("ChangeLog\\'" . change-log-mode) | |
| bb157910 | 799 | ("change.log\\'" . change-log-mode) |
| 9bb004f6 | 800 | ("changelo\\'" . change-log-mode) |
| 7adc58e5 | 801 | ("ChangeLog.[0-9]+\\'" . change-log-mode) |
| 7b3f3dc2 | 802 | ("\\$CHANGE_LOG\\$\\.TXT" . change-log-mode) |
| 7adc58e5 RS |
803 | ;; The following should come after the ChangeLog pattern |
| 804 | ;; for the sake of ChangeLog.1, etc. | |
| 805 | ("\\.[12345678]\\'" . nroff-mode) | |
| 7b3f3dc2 JB |
806 | ("\\.TeX\\'" . TeX-mode) |
| 807 | ("\\.sty\\'" . LaTeX-mode) | |
| 808 | ("\\.bbl\\'" . LaTeX-mode) | |
| 809 | ("\\.bib\\'" . bibtex-mode) | |
| 810 | ("\\.article\\'" . text-mode) | |
| 811 | ("\\.letter\\'" . text-mode) | |
| 7ca1d903 | 812 | ("\\.tcl\\'" . tcl-mode) |
| 7b3f3dc2 JB |
813 | ("\\.lsp\\'" . lisp-mode) |
| 814 | ("\\.awk\\'" . awk-mode) | |
| 815 | ("\\.prolog\\'" . prolog-mode) | |
| c80d2575 | 816 | ("\\.tar\\'" . tar-mode) |
| 7b3f3dc2 JB |
817 | ;; Mailer puts message to be edited in |
| 818 | ;; /tmp/Re.... or Message | |
| 819 | ("^/tmp/Re" . text-mode) | |
| 820 | ("/Message[0-9]*\\'" . text-mode) | |
| 821 | ;; some news reader is reported to use this | |
| 822 | ("^/tmp/fol/" . text-mode) | |
| 823 | ("\\.y\\'" . c-mode) | |
| c80d2575 | 824 | ("\\.lex\\'" . c-mode) |
| 7b3f3dc2 JB |
825 | ("\\.oak\\'" . scheme-mode) |
| 826 | ("\\.scm.[0-9]*\\'" . scheme-mode) | |
| 278584fb RS |
827 | ("\\.sgm\\'" . sgml-mode) |
| 828 | ("\\.sgml\\'" . sgml-mode) | |
| 829 | ("\\.dtd\\'" . sgml-mode) | |
| 7b3f3dc2 JB |
830 | ;; .emacs following a directory delimiter |
| 831 | ;; in either Unix or VMS syntax. | |
| 832 | ("[]>:/]\\..*emacs\\'" . emacs-lisp-mode) | |
| bb157910 RS |
833 | ;; _emacs following a directory delimiter |
| 834 | ;; in MsDos syntax | |
| 835 | ("[:/]_emacs\\'" . emacs-lisp-mode) | |
| 7b3f3dc2 JB |
836 | ("\\.ml\\'" . lisp-mode))) |
| 837 | "\ | |
| 838 | Alist of filename patterns vs corresponding major mode functions. | |
| 81860e46 RS |
839 | Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION). |
| 840 | Visiting a file whose name matches REGEXP causes FUNCTION to be called. | |
| 841 | If the element has the form (REGEXP FUNCTION), then after calling | |
| 842 | FUNCTION, we delete the suffix that matched REGEXP and search the list | |
| 843 | again for another match.") | |
| 7b3f3dc2 | 844 | |
| c907d156 RS |
845 | (defconst interpreter-mode-alist |
| 846 | '(("perl" . perl-mode) | |
| 847 | ("scope" . tcl-mode) | |
| 848 | ("wish" . tcl-mode) | |
| 849 | ("shell" . tcl-mode) | |
| 850 | ("form" . tcl-mode) | |
| 8db739de NF |
851 | ("tcl" . tcl-mode) |
| 852 | ("awk" . awk-mode) | |
| 853 | ("gawk" . awk-mode) | |
| 854 | ("scm" . scheme-mode)) | |
| c907d156 RS |
855 | "Alist mapping interpreter names to major modes. |
| 856 | This alist applies to files whose first line starts with `#!'. | |
| 857 | Each element looks like (INTERPRETER . MODE). | |
| 858 | The car of each element is compared with | |
| 859 | the name of the interpreter specified in the first line. | |
| 860 | If it matches, mode MODE is selected.") | |
| 861 | ||
| a0c9f21b RS |
862 | (defconst inhibit-local-variables-regexps '("\\.tar$") |
| 863 | "List of regexps; if one matches a file name, don't look for local vars.") | |
| 864 | ||
| bb157910 RS |
865 | (defvar user-init-file |
| 866 | "" ; set by command-line | |
| 867 | "File name including directory of user's initialization file.") | |
| 868 | ||
| b4da00e9 RM |
869 | (defun set-auto-mode () |
| 870 | "Select major mode appropriate for current buffer. | |
| 7b3f3dc2 | 871 | This checks for a -*- mode tag in the buffer's text, or |
| 81860e46 | 872 | compares the filename against the entries in `auto-mode-alist'. It does |
| 7b3f3dc2 JB |
873 | not check for the \"mode:\" local variable in the Local Variables |
| 874 | section of the file; for that, use `hack-local-variables'. | |
| 875 | ||
| f3e23606 | 876 | If `enable-local-variables' is nil, this function does not check for a |
| 7b3f3dc2 | 877 | -*- mode tag." |
| b4da00e9 | 878 | ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*- |
| 9fa7bfe5 | 879 | (let (beg end done) |
| b4da00e9 RM |
880 | (save-excursion |
| 881 | (goto-char (point-min)) | |
| 882 | (skip-chars-forward " \t\n") | |
| 9fa7bfe5 RS |
883 | (and enable-local-variables |
| 884 | ;; Don't look for -*- if this file name matches any | |
| 885 | ;; of the regexps in inhibit-local-variables-regexps. | |
| 886 | (let ((temp inhibit-local-variables-regexps)) | |
| 887 | (while (and temp | |
| 888 | (not (string-match (car temp) | |
| 889 | buffer-file-name))) | |
| 890 | (setq temp (cdr temp))) | |
| 891 | (not temp)) | |
| 892 | (search-forward "-*-" (save-excursion | |
| 893 | ;; If the file begins with "#!" | |
| 894 | ;; (exec interpreter magic), look | |
| 895 | ;; for mode frobs in the first two | |
| 896 | ;; lines. You cannot necessarily | |
| 897 | ;; put them in the first line of | |
| 898 | ;; such a file without screwing up | |
| 899 | ;; the interpreter invocation. | |
| 900 | (end-of-line (and (looking-at "^#!") 2)) | |
| 901 | (point)) t) | |
| 902 | (progn | |
| 903 | (skip-chars-forward " \t") | |
| 904 | (setq beg (point)) | |
| 905 | (search-forward "-*-" | |
| 906 | (save-excursion (end-of-line) (point)) | |
| 907 | t)) | |
| 908 | (progn | |
| 909 | (forward-char -3) | |
| 910 | (skip-chars-backward " \t") | |
| 911 | (setq end (point)) | |
| 912 | (goto-char beg) | |
| 913 | (if (save-excursion (search-forward ":" end t)) | |
| 914 | ;; Find all specifications for the `mode:' variable | |
| 57a0155c | 915 | ;; and execute them left to right. |
| 9fa7bfe5 RS |
916 | (while (let ((case-fold-search t)) |
| 917 | (search-forward "mode:" end t)) | |
| 918 | (skip-chars-forward " \t") | |
| 919 | (setq beg (point)) | |
| 920 | (if (search-forward ";" end t) | |
| 921 | (forward-char -1) | |
| 922 | (goto-char end)) | |
| 923 | (skip-chars-backward " \t") | |
| 924 | (funcall (intern (concat (downcase (buffer-substring beg (point))) "-mode")))) | |
| 925 | ;; Simple -*-MODE-*- case. | |
| 926 | (funcall (intern (concat (downcase (buffer-substring beg end)) "-mode")))) | |
| 927 | (setq done t))) | |
| 928 | ;; If we didn't find a mode from a -*- line, try using the file name. | |
| 929 | (if (and (not done) buffer-file-name) | |
| 81860e46 RS |
930 | (let ((name buffer-file-name) |
| 931 | (case-fold-search (eq system-type 'vax-vms)) | |
| 932 | (keep-going t)) | |
| 933 | ;; Remove backup-suffixes from file name. | |
| 934 | (setq name (file-name-sans-versions name)) | |
| 935 | (while keep-going | |
| 936 | (setq keep-going nil) | |
| 937 | (let ((alist auto-mode-alist) | |
| 938 | (mode nil)) | |
| 939 | ;; Find first matching alist entry. | |
| 940 | (while (and (not mode) alist) | |
| 941 | (if (string-match (car (car alist)) name) | |
| 942 | (if (and (consp (cdr (car alist))) | |
| 943 | (nth 2 (car alist))) | |
| 944 | (progn | |
| 945 | (setq mode (car (cdr (car alist))) | |
| 946 | name (substring name 0 (match-beginning 0)) | |
| 947 | keep-going t)) | |
| 948 | (setq mode (cdr (car alist)) | |
| 949 | keep-going nil))) | |
| 950 | (setq alist (cdr alist))) | |
| c907d156 RS |
951 | (if mode |
| 952 | (funcall mode) | |
| 953 | ;; If we can't deduce a mode from the file name, | |
| 954 | ;; look for an interpreter specified in the first line. | |
| 955 | (let ((interpreter | |
| 956 | (save-excursion | |
| 957 | (goto-char (point-min)) | |
| 958 | (if (looking-at "#! *") | |
| 959 | (progn | |
| 960 | (goto-char (match-end 0)) | |
| 961 | (buffer-substring (point) | |
| 962 | (progn (end-of-line) (point)))) | |
| 963 | ""))) | |
| 964 | elt) | |
| 965 | ;; Map interpreter name to a mode. | |
| 966 | (setq elt (assoc (file-name-nondirectory interpreter) | |
| 967 | interpreter-mode-alist)) | |
| 968 | (if elt | |
| 969 | (funcall (cdr elt)))))))))))) | |
| b4da00e9 | 970 | |
| f3e23606 RS |
971 | (defun hack-local-variables-prop-line () |
| 972 | ;; Set local variables specified in the -*- line. | |
| 9fa7bfe5 RS |
973 | ;; Ignore any specification for `mode:'; |
| 974 | ;; set-auto-mode should already have handled that. | |
| f3e23606 RS |
975 | (save-excursion |
| 976 | (goto-char (point-min)) | |
| 977 | (skip-chars-forward " \t\n\r") | |
| 978 | (let ((result '()) | |
| 9fa7bfe5 | 979 | (end (save-excursion (end-of-line) (point)))) |
| f3e23606 RS |
980 | ;; Parse the -*- line into the `result' alist. |
| 981 | (cond ((not (search-forward "-*-" end t)) | |
| 982 | ;; doesn't have one. | |
| 983 | nil) | |
| 984 | ((looking-at "[ \t]*\\([^ \t\n\r:;]+\\)\\([ \t]*-\\*-\\)") | |
| 985 | ;; Simple form: "-*- MODENAME -*-". | |
| 986 | (setq result | |
| 987 | (list (cons 'mode | |
| 988 | (intern (buffer-substring | |
| 989 | (match-beginning 1) | |
| 990 | (match-end 1))))))) | |
| 991 | (t | |
| 992 | ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-' | |
| 993 | ;; (last ";" is optional). | |
| 994 | (save-excursion | |
| 995 | (if (search-forward "-*-" end t) | |
| 996 | (setq end (- (point) 3)) | |
| 997 | (error "-*- not terminated before end of line"))) | |
| 998 | (while (< (point) end) | |
| 999 | (or (looking-at "[ \t]*\\([^ \t\n:]+\\)[ \t]*:[ \t]*") | |
| 1000 | (error "malformed -*- line")) | |
| 1001 | (goto-char (match-end 0)) | |
| 1002 | (let ((key (intern (downcase (buffer-substring | |
| 1003 | (match-beginning 1) | |
| 1004 | (match-end 1))))) | |
| 1005 | (val (save-restriction | |
| 1006 | (narrow-to-region (point) end) | |
| 1007 | (read (current-buffer))))) | |
| 1008 | (setq result (cons (cons key val) result)) | |
| 1009 | (skip-chars-forward " \t;"))) | |
| 1010 | (setq result (nreverse result)))) | |
| f3e23606 RS |
1011 | |
| 1012 | (if (and result | |
| 1013 | (or (eq enable-local-variables t) | |
| 1014 | (and enable-local-variables | |
| 1015 | (save-window-excursion | |
| 6f931919 RS |
1016 | (condition-case nil |
| 1017 | (switch-to-buffer (current-buffer)) | |
| 1018 | (error | |
| 1019 | ;; If we fail to switch in the selected window, | |
| 1020 | ;; it is probably a minibuffer. | |
| 1021 | ;; So try another window. | |
| 1022 | (condition-case nil | |
| 1023 | (switch-to-buffer-other-window (current-buffer)) | |
| 1024 | (error | |
| 1025 | (switch-to-buffer-other-frame (current-buffer)))))) | |
| f3e23606 RS |
1026 | (y-or-n-p (format "Set local variables as specified in -*- line of %s? " |
| 1027 | (file-name-nondirectory buffer-file-name))))))) | |
| 1028 | (while result | |
| 1029 | (let ((key (car (car result))) | |
| 1030 | (val (cdr (car result)))) | |
| 9fa7bfe5 RS |
1031 | (or (eq key 'mode) |
| 1032 | (hack-one-local-variable key val))) | |
| 1033 | (setq result (cdr result))))))) | |
| f3e23606 | 1034 | |
| 7b3f3dc2 | 1035 | (defun hack-local-variables () |
| 5792c834 | 1036 | "Parse and put into effect this buffer's local variables spec." |
| f3e23606 | 1037 | (hack-local-variables-prop-line) |
| b4da00e9 RM |
1038 | ;; Look for "Local variables:" line in last page. |
| 1039 | (save-excursion | |
| 1040 | (goto-char (point-max)) | |
| 1041 | (search-backward "\n\^L" (max (- (point-max) 3000) (point-min)) 'move) | |
| 1042 | (if (let ((case-fold-search t)) | |
| 1043 | (and (search-forward "Local Variables:" nil t) | |
| 7b3f3dc2 | 1044 | (or (eq enable-local-variables t) |
| b4da00e9 RM |
1045 | (and enable-local-variables |
| 1046 | (save-window-excursion | |
| 1047 | (switch-to-buffer (current-buffer)) | |
| 1048 | (save-excursion | |
| 1049 | (beginning-of-line) | |
| 1050 | (set-window-start (selected-window) (point))) | |
| 1051 | (y-or-n-p (format "Set local variables as specified at end of %s? " | |
| 51de78c1 RS |
1052 | (if buffer-file-name |
| 1053 | (file-name-nondirectory | |
| 1054 | buffer-file-name) | |
| 1055 | (concat "buffer " | |
| 1056 | (buffer-name)))))))))) | |
| b4da00e9 | 1057 | (let ((continue t) |
| 2bba782c RS |
1058 | prefix prefixlen suffix beg |
| 1059 | (enable-local-eval enable-local-eval)) | |
| b4da00e9 RM |
1060 | ;; The prefix is what comes before "local variables:" in its line. |
| 1061 | ;; The suffix is what comes after "local variables:" in its line. | |
| 1062 | (skip-chars-forward " \t") | |
| 1063 | (or (eolp) | |
| 1064 | (setq suffix (buffer-substring (point) | |
| 1065 | (progn (end-of-line) (point))))) | |
| 1066 | (goto-char (match-beginning 0)) | |
| 1067 | (or (bolp) | |
| 1068 | (setq prefix | |
| 1069 | (buffer-substring (point) | |
| 1070 | (progn (beginning-of-line) (point))))) | |
| 7b3f3dc2 | 1071 | |
| b4da00e9 RM |
1072 | (if prefix (setq prefixlen (length prefix) |
| 1073 | prefix (regexp-quote prefix))) | |
| 1074 | (if suffix (setq suffix (concat (regexp-quote suffix) "$"))) | |
| 1075 | (while continue | |
| 1076 | ;; Look at next local variable spec. | |
| 1077 | (if selective-display (re-search-forward "[\n\C-m]") | |
| 1078 | (forward-line 1)) | |
| 1079 | ;; Skip the prefix, if any. | |
| 1080 | (if prefix | |
| 1081 | (if (looking-at prefix) | |
| 1082 | (forward-char prefixlen) | |
| 1083 | (error "Local variables entry is missing the prefix"))) | |
| 1084 | ;; Find the variable name; strip whitespace. | |
| 1085 | (skip-chars-forward " \t") | |
| 1086 | (setq beg (point)) | |
| 1087 | (skip-chars-forward "^:\n") | |
| 1088 | (if (eolp) (error "Missing colon in local variables entry")) | |
| 1089 | (skip-chars-backward " \t") | |
| 1090 | (let* ((str (buffer-substring beg (point))) | |
| 1091 | (var (read str)) | |
| 1092 | val) | |
| 1093 | ;; Setting variable named "end" means end of list. | |
| 1094 | (if (string-equal (downcase str) "end") | |
| 1095 | (setq continue nil) | |
| 1096 | ;; Otherwise read the variable value. | |
| 1097 | (skip-chars-forward "^:") | |
| 1098 | (forward-char 1) | |
| 1099 | (setq val (read (current-buffer))) | |
| 1100 | (skip-chars-backward "\n") | |
| 1101 | (skip-chars-forward " \t") | |
| 1102 | (or (if suffix (looking-at suffix) (eolp)) | |
| 1103 | (error "Local variables entry is terminated incorrectly")) | |
| 1104 | ;; Set the variable. "Variables" mode and eval are funny. | |
| f3e23606 RS |
1105 | (hack-one-local-variable var val)))))))) |
| 1106 | ||
| 1107 | (defconst ignored-local-variables | |
| 1108 | '(enable-local-eval) | |
| 1109 | "Variables to be ignored in a file's local variable spec.") | |
| 1110 | ||
| 1111 | ;; "Set" one variable in a local variables spec. | |
| 1112 | ;; A few variable names are treated specially. | |
| 1113 | (defun hack-one-local-variable (var val) | |
| 1114 | (cond ((eq var 'mode) | |
| 1115 | (funcall (intern (concat (downcase (symbol-name val)) | |
| 1116 | "-mode")))) | |
| 1117 | ((memq var ignored-local-variables) | |
| 1118 | nil) | |
| 1119 | ;; "Setting" eval means either eval it or do nothing. | |
| 7d3221d7 | 1120 | ;; Likewise for setting hook variables. |
| fea504fb | 1121 | ((or (memq var '(eval file-name-handler-alist after-load-alist)) |
| 7d3221d7 | 1122 | (string-match "-hooks?$\\|-functions?$" (symbol-name var))) |
| f3e23606 RS |
1123 | (if (and (not (string= (user-login-name) "root")) |
| 1124 | (or (eq enable-local-eval t) | |
| 1125 | (and enable-local-eval | |
| 1126 | (save-window-excursion | |
| 1127 | (switch-to-buffer (current-buffer)) | |
| 1128 | (save-excursion | |
| 1129 | (beginning-of-line) | |
| 1130 | (set-window-start (selected-window) (point))) | |
| 1131 | (setq enable-local-eval | |
| 7d3221d7 | 1132 | (y-or-n-p (format "Process `eval' or hook local variables in file %s? " |
| f3e23606 | 1133 | (file-name-nondirectory buffer-file-name)))))))) |
| 7d3221d7 RS |
1134 | (if (eq var 'eval) |
| 1135 | (save-excursion (eval val)) | |
| 1136 | (make-local-variable var) | |
| 1137 | (set var val)) | |
| f3e23606 RS |
1138 | (message "Ignoring `eval:' in file's local variables"))) |
| 1139 | ;; Ordinary variable, really set it. | |
| 1140 | (t (make-local-variable var) | |
| 1141 | (set var val)))) | |
| 1142 | ||
| b4da00e9 RM |
1143 | \f |
| 1144 | (defun set-visited-file-name (filename) | |
| 1145 | "Change name of file visited in current buffer to FILENAME. | |
| 1146 | The next time the buffer is saved it will go in the newly specified file. | |
| 1147 | nil or empty string as argument means make buffer not be visiting any file. | |
| 1148 | Remember to delete the initial contents of the minibuffer | |
| 1149 | if you wish to pass an empty string as the argument." | |
| 1150 | (interactive "FSet visited file name: ") | |
| 1151 | (if filename | |
| 1152 | (setq filename | |
| 1153 | (if (string-equal filename "") | |
| 1154 | nil | |
| 1155 | (expand-file-name filename)))) | |
| 1156 | (or (equal filename buffer-file-name) | |
| b4da00e9 | 1157 | (progn |
| 6a8f71e7 | 1158 | (and filename (lock-buffer filename)) |
| b4da00e9 RM |
1159 | (unlock-buffer))) |
| 1160 | (setq buffer-file-name filename) | |
| 1161 | (if filename ; make buffer name reflect filename. | |
| 5bbbceb1 | 1162 | (let ((new-name (file-name-nondirectory buffer-file-name))) |
| b4da00e9 RM |
1163 | (if (string= new-name "") |
| 1164 | (error "Empty file name")) | |
| 1165 | (if (eq system-type 'vax-vms) | |
| 1166 | (setq new-name (downcase new-name))) | |
| 1167 | (setq default-directory (file-name-directory buffer-file-name)) | |
| 6f931919 RS |
1168 | (or (string= new-name (buffer-name)) |
| 1169 | (rename-buffer new-name t)))) | |
| b4da00e9 RM |
1170 | (setq buffer-backed-up nil) |
| 1171 | (clear-visited-file-modtime) | |
| f3e23606 RS |
1172 | (if filename |
| 1173 | (progn | |
| 1174 | (setq buffer-file-truename | |
| 1175 | (abbreviate-file-name (file-truename buffer-file-name))) | |
| 1176 | (if find-file-visit-truename | |
| 1177 | (setq buffer-file-name buffer-file-truename)) | |
| 1178 | (setq buffer-file-number (nth 10 (file-attributes buffer-file-name)))) | |
| 1179 | (setq buffer-file-truename nil buffer-file-number nil)) | |
| b4da00e9 RM |
1180 | ;; write-file-hooks is normally used for things like ftp-find-file |
| 1181 | ;; that visit things that are not local files as if they were files. | |
| 1182 | ;; Changing to visit an ordinary local file instead should flush the hook. | |
| 1183 | (kill-local-variable 'write-file-hooks) | |
| c9dca4e0 | 1184 | (kill-local-variable 'local-write-file-hooks) |
| b4da00e9 RM |
1185 | (kill-local-variable 'revert-buffer-function) |
| 1186 | (kill-local-variable 'backup-inhibited) | |
| 1187 | ;; Turn off backup files for certain file names. | |
| 1188 | ;; Since this is a permanent local, the major mode won't eliminate it. | |
| 1189 | (and (not (funcall backup-enable-predicate buffer-file-name)) | |
| 1190 | (progn | |
| 1191 | (make-local-variable 'backup-inhibited) | |
| 1192 | (setq backup-inhibited t))) | |
| c77a81cf RS |
1193 | (let ((oauto buffer-auto-save-file-name)) |
| 1194 | ;; If auto-save was not already on, turn it on if appropriate. | |
| 1195 | (if (not buffer-auto-save-file-name) | |
| 1196 | (and buffer-file-name auto-save-default | |
| 1197 | (auto-save-mode t)) | |
| 1198 | ;; If auto save is on, start using a new name. | |
| 1199 | ;; We deliberately don't rename or delete the old auto save | |
| 1200 | ;; for the old visited file name. This is because perhaps | |
| 1201 | ;; the user wants to save the new state and then compare with the | |
| 1202 | ;; previous state from the auto save file. | |
| 1203 | (setq buffer-auto-save-file-name | |
| 1204 | (make-auto-save-file-name))) | |
| 1205 | ;; Rename the old auto save file if any. | |
| 1206 | (and oauto buffer-auto-save-file-name | |
| e6f0e76c | 1207 | (file-exists-p oauto) |
| c77a81cf | 1208 | (rename-file oauto buffer-auto-save-file-name t))) |
| b4da00e9 RM |
1209 | (if buffer-file-name |
| 1210 | (set-buffer-modified-p t))) | |
| 1211 | ||
| 1212 | (defun write-file (filename) | |
| 1213 | "Write current buffer into file FILENAME. | |
| 41f48cb1 RS |
1214 | Makes buffer visit that file, and marks it not modified. |
| 1215 | If the buffer is already visiting a file, you can specify | |
| 1216 | a directory name as FILENAME, to write a file of the same | |
| 1217 | old name in that directory." | |
| b4da00e9 RM |
1218 | ;; (interactive "FWrite file: ") |
| 1219 | (interactive | |
| 1220 | (list (if buffer-file-name | |
| 1221 | (read-file-name "Write file: " | |
| 1222 | nil nil nil nil) | |
| 1223 | (read-file-name "Write file: " | |
| 1224 | (cdr (assq 'default-directory | |
| 1225 | (buffer-local-variables))) | |
| 1226 | nil nil (buffer-name))))) | |
| 1227 | (or (null filename) (string-equal filename "") | |
| 41f48cb1 RS |
1228 | (progn |
| 1229 | ;; If arg is just a directory, | |
| 1230 | ;; use same file name, but in that directory. | |
| 1231 | (if (and (file-directory-p filename) buffer-file-name) | |
| 1232 | (setq filename (concat (file-name-as-directory filename) | |
| 1233 | (file-name-nondirectory buffer-file-name)))) | |
| 1234 | (set-visited-file-name filename))) | |
| b4da00e9 RM |
1235 | (set-buffer-modified-p t) |
| 1236 | (save-buffer)) | |
| 1237 | \f | |
| 1238 | (defun backup-buffer () | |
| 1239 | "Make a backup of the disk file visited by the current buffer, if appropriate. | |
| 1240 | This is normally done before saving the buffer the first time. | |
| 1241 | If the value is non-nil, it is the result of `file-modes' on the original | |
| 1242 | file; this means that the caller, after saving the buffer, should change | |
| 1243 | the modes of the new file to agree with the old modes." | |
| 1244 | (if (and make-backup-files (not backup-inhibited) | |
| 1245 | (not buffer-backed-up) | |
| 1246 | (file-exists-p buffer-file-name) | |
| 1247 | (memq (aref (elt (file-attributes buffer-file-name) 8) 0) | |
| 1248 | '(?- ?l))) | |
| 1249 | (let ((real-file-name buffer-file-name) | |
| 1250 | backup-info backupname targets setmodes) | |
| 1251 | ;; If specified name is a symbolic link, chase it to the target. | |
| 1252 | ;; Thus we make the backups in the directory where the real file is. | |
| 5dadeb29 | 1253 | (setq real-file-name (file-chase-links real-file-name)) |
| b4da00e9 RM |
1254 | (setq backup-info (find-backup-file-name real-file-name) |
| 1255 | backupname (car backup-info) | |
| 1256 | targets (cdr backup-info)) | |
| 1257 | ;;; (if (file-directory-p buffer-file-name) | |
| 1258 | ;;; (error "Cannot save buffer in directory %s" buffer-file-name)) | |
| 1259 | (condition-case () | |
| 1260 | (let ((delete-old-versions | |
| 1261 | ;; If have old versions to maybe delete, | |
| 1262 | ;; ask the user to confirm now, before doing anything. | |
| 1263 | ;; But don't actually delete til later. | |
| 1264 | (and targets | |
| 6d74b528 | 1265 | (or (eq trim-versions-without-asking t) (eq trim-versions-without-asking nil)) |
| b4da00e9 RM |
1266 | (or trim-versions-without-asking |
| 1267 | (y-or-n-p (format "Delete excess backup versions of %s? " | |
| 1268 | real-file-name)))))) | |
| 1269 | ;; Actually write the back up file. | |
| 1270 | (condition-case () | |
| 1271 | (if (or file-precious-flag | |
| 1272 | ; (file-symlink-p buffer-file-name) | |
| 1273 | backup-by-copying | |
| 1274 | (and backup-by-copying-when-linked | |
| 1275 | (> (file-nlinks real-file-name) 1)) | |
| 1276 | (and backup-by-copying-when-mismatch | |
| 1277 | (let ((attr (file-attributes real-file-name))) | |
| 1278 | (or (nth 9 attr) | |
| 1279 | (/= (nth 2 attr) (user-uid)))))) | |
| 65864ae0 RS |
1280 | (condition-case () |
| 1281 | (copy-file real-file-name backupname t t) | |
| 1282 | (file-error | |
| 1283 | ;; If copying fails because file BACKUPNAME | |
| 1284 | ;; is not writable, delete that file and try again. | |
| 1285 | (if (and (file-exists-p backupname) | |
| 1286 | (not (file-writable-p backupname))) | |
| 1287 | (delete-file backupname)) | |
| 1288 | (copy-file real-file-name backupname t t))) | |
| 1289 | ;; rename-file should delete old backup. | |
| b4da00e9 RM |
1290 | (rename-file real-file-name backupname t) |
| 1291 | (setq setmodes (file-modes backupname))) | |
| 1292 | (file-error | |
| 1293 | ;; If trouble writing the backup, write it in ~. | |
| 1294 | (setq backupname (expand-file-name "~/%backup%~")) | |
| 1295 | (message "Cannot write backup file; backing up in ~/%%backup%%~") | |
| 1296 | (sleep-for 1) | |
| 65864ae0 RS |
1297 | (condition-case () |
| 1298 | (copy-file real-file-name backupname t t) | |
| 1299 | (file-error | |
| 1300 | ;; If copying fails because file BACKUPNAME | |
| 1301 | ;; is not writable, delete that file and try again. | |
| 1302 | (if (and (file-exists-p backupname) | |
| 1303 | (not (file-writable-p backupname))) | |
| 1304 | (delete-file backupname)) | |
| 1305 | (copy-file real-file-name backupname t t))))) | |
| b4da00e9 RM |
1306 | (setq buffer-backed-up t) |
| 1307 | ;; Now delete the old versions, if desired. | |
| 1308 | (if delete-old-versions | |
| 1309 | (while targets | |
| 1310 | (condition-case () | |
| 1311 | (delete-file (car targets)) | |
| 1312 | (file-error nil)) | |
| 1313 | (setq targets (cdr targets)))) | |
| 1314 | setmodes) | |
| 1315 | (file-error nil))))) | |
| 1316 | ||
| c3554e95 | 1317 | (defun file-name-sans-versions (name &optional keep-backup-version) |
| b4da00e9 RM |
1318 | "Return FILENAME sans backup versions or strings. |
| 1319 | This is a separate procedure so your site-init or startup file can | |
| c3554e95 RS |
1320 | redefine it. |
| 1321 | If the optional argument KEEP-BACKUP-VERSION is non-nil, | |
| 1322 | we do not remove backup version numbers, only true file version numbers." | |
| 5dbfdacd | 1323 | (let ((handler (find-file-name-handler name))) |
| c3554e95 RS |
1324 | (if handler |
| 1325 | (funcall handler 'file-name-sans-versions name keep-backup-version) | |
| 1326 | (substring name 0 | |
| 1327 | (if (eq system-type 'vax-vms) | |
| 1328 | ;; VMS version number is (a) semicolon, optional | |
| 1329 | ;; sign, zero or more digits or (b) period, option | |
| 1330 | ;; sign, zero or more digits, provided this is the | |
| 1331 | ;; second period encountered outside of the | |
| 1332 | ;; device/directory part of the file name. | |
| 26add1bf KH |
1333 | (or (string-match ";[-+]?[0-9]*\\'" name) |
| 1334 | (if (string-match "\\.[^]>:]*\\(\\.[-+]?[0-9]*\\)\\'" | |
| c3554e95 RS |
1335 | name) |
| 1336 | (match-beginning 1)) | |
| 1337 | (length name)) | |
| 1338 | (if keep-backup-version | |
| 1339 | (length name) | |
| 1340 | (or (string-match "\\.~[0-9]+~\\'" name) | |
| 1341 | (string-match "~\\'" name) | |
| 1342 | (length name)))))))) | |
| b4da00e9 RM |
1343 | |
| 1344 | (defun make-backup-file-name (file) | |
| 1345 | "Create the non-numeric backup file name for FILE. | |
| 1346 | This is a separate function so you can redefine it for customization." | |
| bb157910 RS |
1347 | (if (eq system-type 'ms-dos) |
| 1348 | (let ((fn (file-name-nondirectory file))) | |
| 1349 | (concat (file-name-directory file) | |
| 1350 | (if (string-match "\\([^.]*\\)\\(\\..*\\)?" fn) | |
| 1351 | (substring fn 0 (match-end 1))) | |
| 1352 | ".bak")) | |
| 1353 | (concat file "~"))) | |
| b4da00e9 RM |
1354 | |
| 1355 | (defun backup-file-name-p (file) | |
| 1356 | "Return non-nil if FILE is a backup file name (numeric or not). | |
| 1357 | This is a separate function so you can redefine it for customization. | |
| 1358 | You may need to redefine `file-name-sans-versions' as well." | |
| bb157910 RS |
1359 | (if (eq system-type 'ms-dos) |
| 1360 | (string-match "\\.bak$" file) | |
| 1361 | (string-match "~$" file))) | |
| b4da00e9 | 1362 | |
| 2d051399 RS |
1363 | ;; This is used in various files. |
| 1364 | ;; The usage of bv-length is not very clean, | |
| 1365 | ;; but I can't see a good alternative, | |
| 1366 | ;; so as of now I am leaving it alone. | |
| 1367 | (defun backup-extract-version (fn) | |
| 1368 | "Given the name of a numeric backup file, return the backup number. | |
| 1369 | Uses the free variable `bv-length', whose value should be | |
| 1370 | the index in the name where the version number begins." | |
| 1371 | (if (and (string-match "[0-9]+~$" fn bv-length) | |
| 1372 | (= (match-beginning 0) bv-length)) | |
| 1373 | (string-to-int (substring fn bv-length -1)) | |
| 1374 | 0)) | |
| 1375 | ||
| b4da00e9 RM |
1376 | ;; I believe there is no need to alter this behavior for VMS; |
| 1377 | ;; since backup files are not made on VMS, it should not get called. | |
| 1378 | (defun find-backup-file-name (fn) | |
| 1379 | "Find a file name for a backup file, and suggestions for deletions. | |
| 1380 | Value is a list whose car is the name for the backup file | |
| 1381 | and whose cdr is a list of old versions to consider deleting now." | |
| 1382 | (if (eq version-control 'never) | |
| 1383 | (list (make-backup-file-name fn)) | |
| 1384 | (let* ((base-versions (concat (file-name-nondirectory fn) ".~")) | |
| 1385 | (bv-length (length base-versions)) | |
| 7a5a26a6 RS |
1386 | possibilities |
| 1387 | (versions nil) | |
| 1388 | (high-water-mark 0) | |
| 1389 | (deserve-versions-p nil) | |
| 1390 | (number-to-delete 0)) | |
| 1391 | (condition-case () | |
| 1392 | (setq possibilities (file-name-all-completions | |
| 1393 | base-versions | |
| 1394 | (file-name-directory fn)) | |
| 1395 | versions (sort (mapcar | |
| 1396 | (function backup-extract-version) | |
| 1397 | possibilities) | |
| 1398 | '<) | |
| 1399 | high-water-mark (apply 'max 0 versions) | |
| 1400 | deserve-versions-p (or version-control | |
| 1401 | (> high-water-mark 0)) | |
| 1402 | number-to-delete (- (length versions) | |
| 1403 | kept-old-versions kept-new-versions -1)) | |
| 1404 | (file-error | |
| 1405 | (setq possibilities nil))) | |
| b4da00e9 RM |
1406 | (if (not deserve-versions-p) |
| 1407 | (list (make-backup-file-name fn)) | |
| 1408 | (cons (concat fn ".~" (int-to-string (1+ high-water-mark)) "~") | |
| 9115e938 NF |
1409 | (if (and (> number-to-delete 0) |
| 1410 | ;; Delete nothing if there is overflow | |
| 1411 | ;; in the number of versions to keep. | |
| 1412 | (>= (+ kept-new-versions kept-old-versions -1) 0)) | |
| b4da00e9 RM |
1413 | (mapcar (function (lambda (n) |
| 1414 | (concat fn ".~" (int-to-string n) "~"))) | |
| 1415 | (let ((v (nthcdr kept-old-versions versions))) | |
| 1416 | (rplacd (nthcdr (1- number-to-delete) v) ()) | |
| 1417 | v)))))))) | |
| 1418 | ||
| b4da00e9 RM |
1419 | (defun file-nlinks (filename) |
| 1420 | "Return number of names file FILENAME has." | |
| 1421 | (car (cdr (file-attributes filename)))) | |
| 6c636af9 RM |
1422 | |
| 1423 | (defun file-relative-name (filename &optional directory) | |
| 1424 | "Convert FILENAME to be relative to DIRECTORY (default: default-directory)." | |
| 1425 | (setq filename (expand-file-name filename) | |
| 77fb6aed RS |
1426 | directory (file-name-as-directory (expand-file-name |
| 1427 | (or directory default-directory)))) | |
| b1fa544f KH |
1428 | (let ((ancestor "")) |
| 1429 | (while (not (string-match (concat "^" (regexp-quote directory)) filename)) | |
| 1430 | (setq directory (file-name-directory (substring directory 0 -1)) | |
| 1431 | ancestor (concat "../" ancestor))) | |
| 1432 | (concat ancestor (substring filename (match-end 0))))) | |
| b4da00e9 RM |
1433 | \f |
| 1434 | (defun save-buffer (&optional args) | |
| 1435 | "Save current buffer in visited file if modified. Versions described below. | |
| 1436 | By default, makes the previous version into a backup file | |
| 1437 | if previously requested or if this is the first save. | |
| 1438 | With 1 or 3 \\[universal-argument]'s, marks this version | |
| 1439 | to become a backup when the next save is done. | |
| 1440 | With 2 or 3 \\[universal-argument]'s, | |
| 1441 | unconditionally makes the previous version into a backup file. | |
| 1442 | With argument of 0, never makes the previous version into a backup file. | |
| 1443 | ||
| 1444 | If a file's name is FOO, the names of its numbered backup versions are | |
| 1445 | FOO.~i~ for various integers i. A non-numbered backup file is called FOO~. | |
| 1446 | Numeric backups (rather than FOO~) will be made if value of | |
| 1447 | `version-control' is not the atom `never' and either there are already | |
| 1448 | numeric versions of the file being backed up, or `version-control' is | |
| 1449 | non-nil. | |
| 1450 | We don't want excessive versions piling up, so there are variables | |
| 1451 | `kept-old-versions', which tells Emacs how many oldest versions to keep, | |
| 1452 | and `kept-new-versions', which tells how many newest versions to keep. | |
| 1453 | Defaults are 2 old versions and 2 new. | |
| 1454 | `dired-kept-versions' controls dired's clean-directory (.) command. | |
| 1455 | If `trim-versions-without-asking' is nil, system will query user | |
| 1456 | before trimming versions. Otherwise it does it silently." | |
| 1457 | (interactive "p") | |
| 1458 | (let ((modp (buffer-modified-p)) | |
| 1459 | (large (> (buffer-size) 50000)) | |
| 1460 | (make-backup-files (and make-backup-files (not (eq args 0))))) | |
| 1461 | (and modp (memq args '(16 64)) (setq buffer-backed-up nil)) | |
| 1462 | (if (and modp large) (message "Saving file %s..." (buffer-file-name))) | |
| 1463 | (basic-save-buffer) | |
| 1464 | (and modp (memq args '(4 64)) (setq buffer-backed-up nil)))) | |
| 1465 | ||
| 1466 | (defun delete-auto-save-file-if-necessary (&optional force) | |
| 1467 | "Delete auto-save file for current buffer if `delete-auto-save-files' is t. | |
| 1468 | Normally delete only if the file was written by this Emacs since | |
| 1469 | the last real save, but optional arg FORCE non-nil means delete anyway." | |
| 1470 | (and buffer-auto-save-file-name delete-auto-save-files | |
| 1471 | (not (string= buffer-file-name buffer-auto-save-file-name)) | |
| 1472 | (or force (recent-auto-save-p)) | |
| 1473 | (progn | |
| 1474 | (condition-case () | |
| 1475 | (delete-file buffer-auto-save-file-name) | |
| 1476 | (file-error nil)) | |
| 1477 | (set-buffer-auto-saved)))) | |
| 1478 | ||
| 1479 | (defun basic-save-buffer () | |
| 1480 | "Save the current buffer in its visited file, if it has been modified." | |
| 1481 | (interactive) | |
| 1482 | (if (buffer-modified-p) | |
| 1483 | (let ((recent-save (recent-auto-save-p)) | |
| 1484 | setmodes tempsetmodes) | |
| 1485 | ;; On VMS, rename file and buffer to get rid of version number. | |
| 1486 | (if (and (eq system-type 'vax-vms) | |
| 1487 | (not (string= buffer-file-name | |
| 1488 | (file-name-sans-versions buffer-file-name)))) | |
| 1489 | (let (buffer-new-name) | |
| 1490 | ;; Strip VMS version number before save. | |
| 1491 | (setq buffer-file-name | |
| 1492 | (file-name-sans-versions buffer-file-name)) | |
| 1493 | ;; Construct a (unique) buffer name to correspond. | |
| 1494 | (let ((buf (create-file-buffer (downcase buffer-file-name)))) | |
| 1495 | (setq buffer-new-name (buffer-name buf)) | |
| 1496 | (kill-buffer buf)) | |
| 1497 | (rename-buffer buffer-new-name))) | |
| 1498 | ;; If buffer has no file name, ask user for one. | |
| 1499 | (or buffer-file-name | |
| 2943f983 RS |
1500 | (set-visited-file-name |
| 1501 | (expand-file-name (read-file-name "File to save in: ") nil))) | |
| b4da00e9 RM |
1502 | (or (verify-visited-file-modtime (current-buffer)) |
| 1503 | (not (file-exists-p buffer-file-name)) | |
| 1504 | (yes-or-no-p | |
| 1505 | (format "%s has changed since visited or saved. Save anyway? " | |
| 1506 | (file-name-nondirectory buffer-file-name))) | |
| 1507 | (error "Save not confirmed")) | |
| 1508 | (save-restriction | |
| 1509 | (widen) | |
| 1510 | (and (> (point-max) 1) | |
| 1511 | (/= (char-after (1- (point-max))) ?\n) | |
| 1512 | (or (eq require-final-newline t) | |
| 1513 | (and require-final-newline | |
| 1514 | (y-or-n-p | |
| 1515 | (format "Buffer %s does not end in newline. Add one? " | |
| 1516 | (buffer-name))))) | |
| 1517 | (save-excursion | |
| 1518 | (goto-char (point-max)) | |
| 1519 | (insert ?\n))) | |
| c9dca4e0 RS |
1520 | (let ((hooks (append write-contents-hooks local-write-file-hooks |
| 1521 | write-file-hooks)) | |
| b4da00e9 RM |
1522 | (done nil)) |
| 1523 | (while (and hooks | |
| 1524 | (not (setq done (funcall (car hooks))))) | |
| 1525 | (setq hooks (cdr hooks))) | |
| 1526 | ;; If a hook returned t, file is already "written". | |
| 1527 | (cond ((not done) | |
| 1528 | (if (not (file-writable-p buffer-file-name)) | |
| 1529 | (let ((dir (file-name-directory buffer-file-name))) | |
| 1530 | (if (not (file-directory-p dir)) | |
| 1531 | (error "%s is not a directory" dir) | |
| 1532 | (if (not (file-exists-p buffer-file-name)) | |
| 1533 | (error "Directory %s write-protected" dir) | |
| 1534 | (if (yes-or-no-p | |
| 1535 | (format "File %s is write-protected; try to save anyway? " | |
| 1536 | (file-name-nondirectory | |
| 1537 | buffer-file-name))) | |
| 1538 | (setq tempsetmodes t) | |
| 1539 | (error "Attempt to save to a file which you aren't allowed to write")))))) | |
| 1540 | (or buffer-backed-up | |
| 1541 | (setq setmodes (backup-buffer))) | |
| 1542 | (if file-precious-flag | |
| f3e23606 RS |
1543 | ;; If file is precious, write temp name, then rename it. |
| 1544 | (let ((dir (file-name-directory buffer-file-name)) | |
| 1545 | (realname buffer-file-name) | |
| 1546 | tempname temp nogood i succeed) | |
| 1547 | (setq i 0) | |
| 1548 | (setq nogood t) | |
| 1549 | ;; Find the temporary name to write under. | |
| 1550 | (while nogood | |
| 1551 | (setq tempname (format "%s#tmp#%d" dir i)) | |
| 1552 | (setq nogood (file-exists-p tempname)) | |
| 1553 | (setq i (1+ i))) | |
| b4da00e9 RM |
1554 | (unwind-protect |
| 1555 | (progn (clear-visited-file-modtime) | |
| 1556 | (write-region (point-min) (point-max) | |
| f3e23606 RS |
1557 | tempname nil realname) |
| 1558 | (setq succeed t)) | |
| 1559 | ;; If writing the temp file fails, | |
| 1560 | ;; delete the temp file. | |
| 1561 | (or succeed (delete-file tempname))) | |
| b411d947 JB |
1562 | ;; Since we have created an entirely new file |
| 1563 | ;; and renamed it, make sure it gets the | |
| 1564 | ;; right permission bits set. | |
| 1565 | (setq setmodes (file-modes buffer-file-name)) | |
| f3e23606 RS |
1566 | ;; We succeeded in writing the temp file, |
| 1567 | ;; so rename it. | |
| 1568 | (rename-file tempname buffer-file-name t)) | |
| b4da00e9 RM |
1569 | ;; If file not writable, see if we can make it writable |
| 1570 | ;; temporarily while we write it. | |
| 1571 | ;; But no need to do so if we have just backed it up | |
| 1572 | ;; (setmodes is set) because that says we're superseding. | |
| 1573 | (cond ((and tempsetmodes (not setmodes)) | |
| 1574 | ;; Change the mode back, after writing. | |
| 1575 | (setq setmodes (file-modes buffer-file-name)) | |
| 1576 | (set-file-modes buffer-file-name 511))) | |
| 1577 | (write-region (point-min) (point-max) | |
| 1578 | buffer-file-name nil t))))) | |
| f3e23606 | 1579 | (setq buffer-file-number (nth 10 (file-attributes buffer-file-name))) |
| b4da00e9 RM |
1580 | (if setmodes |
| 1581 | (condition-case () | |
| f3e23606 | 1582 | (set-file-modes buffer-file-name setmodes) |
| b4da00e9 RM |
1583 | (error nil)))) |
| 1584 | ;; If the auto-save file was recent before this command, | |
| 1585 | ;; delete it now. | |
| 1586 | (delete-auto-save-file-if-necessary recent-save) | |
| 1bf3d475 | 1587 | (run-hooks 'after-save-hook)) |
| b4da00e9 RM |
1588 | (message "(No changes need to be saved)"))) |
| 1589 | ||
| b4da00e9 RM |
1590 | (defun save-some-buffers (&optional arg exiting) |
| 1591 | "Save some modified file-visiting buffers. Asks user about each one. | |
| 5bbbceb1 JB |
1592 | Optional argument (the prefix) non-nil means save all with no questions. |
| 1593 | Optional second argument EXITING means ask about certain non-file buffers | |
| 1594 | as well as about file buffers." | |
| b4da00e9 | 1595 | (interactive "P") |
| 907482b9 | 1596 | (save-window-excursion |
| 5625c2fc RS |
1597 | (let ((files-done |
| 1598 | (map-y-or-n-p | |
| 1599 | (function | |
| 1600 | (lambda (buffer) | |
| 1601 | (and (buffer-modified-p buffer) | |
| 1602 | (or | |
| 1603 | (buffer-file-name buffer) | |
| 1604 | (and exiting | |
| 1605 | (progn | |
| 1606 | (set-buffer buffer) | |
| 1607 | (and buffer-offer-save (> (buffer-size) 0))))) | |
| 1608 | (if arg | |
| 1609 | t | |
| 1610 | (if (buffer-file-name buffer) | |
| 1611 | (format "Save file %s? " | |
| 1612 | (buffer-file-name buffer)) | |
| 1613 | (format "Save buffer %s? " | |
| 1614 | (buffer-name buffer))))))) | |
| 1615 | (function | |
| 1616 | (lambda (buffer) | |
| 1617 | (set-buffer buffer) | |
| 1618 | (save-buffer))) | |
| 1619 | (buffer-list) | |
| 1620 | '("buffer" "buffers" "save") | |
| 1621 | (list (list ?\C-r (lambda (buf) | |
| 1622 | (view-buffer buf) | |
| 1623 | (setq view-exit-action | |
| 1624 | '(lambda (ignore) | |
| 1625 | (exit-recursive-edit))) | |
| 1626 | (recursive-edit) | |
| 1627 | ;; Return nil to ask about BUF again. | |
| 1628 | nil) | |
| 1629 | "display the current buffer")))) | |
| 1630 | (abbrevs-done | |
| 1631 | (and save-abbrevs abbrevs-changed | |
| 1632 | (progn | |
| 1633 | (if (or arg | |
| 1634 | (y-or-n-p (format "Save abbrevs in %s? " abbrev-file-name))) | |
| 1635 | (write-abbrev-file nil)) | |
| 1636 | ;; Don't keep bothering user if he says no. | |
| 1637 | (setq abbrevs-changed nil) | |
| 1638 | t)))) | |
| 1639 | (or (> files-done 0) abbrevs-done | |
| 1640 | (message "(No files need saving)"))))) | |
| b4da00e9 RM |
1641 | \f |
| 1642 | (defun not-modified (&optional arg) | |
| 1643 | "Mark current buffer as unmodified, not needing to be saved. | |
| 1644 | With prefix arg, mark buffer as modified, so \\[save-buffer] will save." | |
| 1645 | (interactive "P") | |
| 1646 | (message (if arg "Modification-flag set" | |
| 1647 | "Modification-flag cleared")) | |
| 1648 | (set-buffer-modified-p arg)) | |
| 1649 | ||
| 1650 | (defun toggle-read-only (&optional arg) | |
| 1651 | "Change whether this buffer is visiting its file read-only. | |
| 1652 | With arg, set read-only iff arg is positive." | |
| 1653 | (interactive "P") | |
| 1654 | (setq buffer-read-only | |
| 1655 | (if (null arg) | |
| 1656 | (not buffer-read-only) | |
| 1657 | (> (prefix-numeric-value arg) 0))) | |
| 1658 | ;; Force mode-line redisplay | |
| 1659 | (set-buffer-modified-p (buffer-modified-p))) | |
| 1660 | ||
| 1661 | (defun insert-file (filename) | |
| 1662 | "Insert contents of file FILENAME into buffer after point. | |
| 1663 | Set mark after the inserted text. | |
| 1664 | ||
| 1665 | This function is meant for the user to run interactively. | |
| 1666 | Don't call it from programs! Use `insert-file-contents' instead. | |
| 1667 | \(Its calling sequence is different; see its documentation)." | |
| 6f931919 | 1668 | (interactive "*fInsert file: ") |
| 3be6243a RS |
1669 | (if (file-directory-p filename) |
| 1670 | (signal 'file-error (list "Opening input file" "file is a directory" | |
| 1671 | filename))) | |
| b4da00e9 RM |
1672 | (let ((tem (insert-file-contents filename))) |
| 1673 | (push-mark (+ (point) (car (cdr tem)))))) | |
| 1674 | ||
| 1675 | (defun append-to-file (start end filename) | |
| 1676 | "Append the contents of the region to the end of file FILENAME. | |
| 1677 | When called from a function, expects three arguments, | |
| 1678 | START, END and FILENAME. START and END are buffer positions | |
| 1679 | saying what text to write." | |
| 1680 | (interactive "r\nFAppend to file: ") | |
| 1681 | (write-region start end filename t)) | |
| 1682 | ||
| 1683 | (defun file-newest-backup (filename) | |
| 1684 | "Return most recent backup file for FILENAME or nil if no backups exist." | |
| 1685 | (let* ((filename (expand-file-name filename)) | |
| 1686 | (file (file-name-nondirectory filename)) | |
| 1687 | (dir (file-name-directory filename)) | |
| 1688 | (comp (file-name-all-completions file dir)) | |
| 1689 | newest) | |
| 1690 | (while comp | |
| 1691 | (setq file (concat dir (car comp)) | |
| 1692 | comp (cdr comp)) | |
| 1693 | (if (and (backup-file-name-p file) | |
| 1694 | (or (null newest) (file-newer-than-file-p file newest))) | |
| 1695 | (setq newest file))) | |
| 1696 | newest)) | |
| 1697 | ||
| 1698 | (defun rename-uniquely () | |
| 1699 | "Rename current buffer to a similar name not already taken. | |
| 1700 | This function is useful for creating multiple shell process buffers | |
| 1701 | or multiple mail buffers, etc." | |
| 1702 | (interactive) | |
| 1703 | (let* ((new-buf (generate-new-buffer (buffer-name))) | |
| 1704 | (name (buffer-name new-buf))) | |
| 1705 | (kill-buffer new-buf) | |
| 1706 | (rename-buffer name) | |
| 1707 | (set-buffer-modified-p (buffer-modified-p)))) ; force mode line update | |
| 5bbbceb1 | 1708 | |
| 4e43240a | 1709 | (defun make-directory (dir &optional parents) |
| 5ce8bb89 RS |
1710 | "Create the directory DIR and any nonexistent parent dirs. |
| 1711 | Interactively, the default choice of directory to create | |
| 1712 | is the current default directory for file names. | |
| 1713 | That is useful when you have visited a file in a nonexistint directory. | |
| 1714 | ||
| 1715 | Noninteractively, the second (optional) argument PARENTS says whether | |
| 1716 | to create parent directories if they don't exist." | |
| 1717 | (interactive | |
| 1718 | (list (read-file-name "Make directory: " default-directory default-directory | |
| 1719 | nil nil) | |
| 1720 | t)) | |
| 5dbfdacd | 1721 | (let ((handler (find-file-name-handler dir))) |
| 4e43240a RS |
1722 | (if handler |
| 1723 | (funcall handler 'make-directory dir parents) | |
| 1724 | (if (not parents) | |
| 1725 | (make-directory-internal dir) | |
| 1726 | (let ((dir (directory-file-name (expand-file-name dir))) | |
| 1727 | create-list) | |
| 1728 | (while (not (file-exists-p dir)) | |
| 1729 | (setq create-list (cons dir create-list) | |
| 1730 | dir (directory-file-name (file-name-directory dir)))) | |
| 1731 | (while create-list | |
| 1732 | (make-directory-internal (car create-list)) | |
| 1733 | (setq create-list (cdr create-list)))))))) | |
| b4da00e9 RM |
1734 | \f |
| 1735 | (put 'revert-buffer-function 'permanent-local t) | |
| 1736 | (defvar revert-buffer-function nil | |
| 1737 | "Function to use to revert this buffer, or nil to do the default.") | |
| 1738 | ||
| 1739 | (put 'revert-buffer-insert-file-contents-function 'permanent-local t) | |
| 1740 | (defvar revert-buffer-insert-file-contents-function nil | |
| 1741 | "Function to use to insert contents when reverting this buffer. | |
| 1742 | Gets two args, first the nominal file name to use, | |
| 1743 | and second, t if reading the auto-save file.") | |
| 1744 | ||
| 1ab31687 | 1745 | (defun revert-buffer (&optional ignore-auto noconfirm) |
| b4da00e9 RM |
1746 | "Replace the buffer text with the text of the visited file on disk. |
| 1747 | This undoes all changes since the file was visited or saved. | |
| 8c0e7b73 JB |
1748 | With a prefix argument, offer to revert from latest auto-save file, if |
| 1749 | that is more recent than the visited file. | |
| 1ab31687 | 1750 | |
| fc51b251 | 1751 | When called from lisp, The first argument is IGNORE-AUTO; only offer |
| 1ab31687 JB |
1752 | to revert from the auto-save file when this is nil. Note that the |
| 1753 | sense of this argument is the reverse of the prefix argument, for the | |
| 1754 | sake of backward compatibility. IGNORE-AUTO is optional, defaulting | |
| 1755 | to nil. | |
| 1756 | ||
| 1757 | Optional second argument NOCONFIRM means don't ask for confirmation at | |
| 1758 | all. | |
| b4da00e9 | 1759 | |
| 8c0e7b73 | 1760 | If the value of `revert-buffer-function' is non-nil, it is called to |
| fb6208a6 RS |
1761 | do the work. |
| 1762 | ||
| 4fbf62ee KH |
1763 | The default revert function runs the hook `before-revert-hook' at the |
| 1764 | beginning and `after-revert-hook' at the end." | |
| 1ab31687 JB |
1765 | ;; I admit it's odd to reverse the sense of the prefix argument, but |
| 1766 | ;; there is a lot of code out there which assumes that the first | |
| 1767 | ;; argument should be t to avoid consulting the auto-save file, and | |
| 1768 | ;; there's no straightforward way to encourage authors to notice a | |
| 1769 | ;; reversal of the argument sense. So I'm just changing the user | |
| 1770 | ;; interface, but leaving the programmatic interface the same. | |
| 1771 | (interactive (list (not prefix-arg))) | |
| b4da00e9 | 1772 | (if revert-buffer-function |
| 1ab31687 | 1773 | (funcall revert-buffer-function ignore-auto noconfirm) |
| b4da00e9 | 1774 | (let* ((opoint (point)) |
| 1ab31687 JB |
1775 | (auto-save-p (and (not ignore-auto) |
| 1776 | (recent-auto-save-p) | |
| b4da00e9 RM |
1777 | buffer-auto-save-file-name |
| 1778 | (file-readable-p buffer-auto-save-file-name) | |
| 1779 | (y-or-n-p | |
| 1780 | "Buffer has been auto-saved recently. Revert from auto-save file? "))) | |
| 1781 | (file-name (if auto-save-p | |
| 1782 | buffer-auto-save-file-name | |
| 1783 | buffer-file-name))) | |
| 1784 | (cond ((null file-name) | |
| 1785 | (error "Buffer does not seem to be associated with any file")) | |
| 1786 | ((or noconfirm | |
| 1787 | (yes-or-no-p (format "Revert buffer from file %s? " | |
| 1788 | file-name))) | |
| 4fbf62ee | 1789 | (run-hooks 'before-revert-hook) |
| b4da00e9 RM |
1790 | ;; If file was backed up but has changed since, |
| 1791 | ;; we shd make another backup. | |
| 1792 | (and (not auto-save-p) | |
| 5bbbceb1 | 1793 | (not (verify-visited-file-modtime (current-buffer))) |
| b4da00e9 RM |
1794 | (setq buffer-backed-up nil)) |
| 1795 | ;; Get rid of all undo records for this buffer. | |
| 1796 | (or (eq buffer-undo-list t) | |
| 1797 | (setq buffer-undo-list nil)) | |
| 1798 | (let ((buffer-read-only nil) | |
| 1799 | ;; Don't make undo records for the reversion. | |
| 1800 | (buffer-undo-list t)) | |
| 1801 | (if revert-buffer-insert-file-contents-function | |
| 1802 | (funcall revert-buffer-insert-file-contents-function | |
| 1803 | file-name auto-save-p) | |
| 1804 | (if (not (file-exists-p file-name)) | |
| 1805 | (error "File %s no longer exists!" file-name)) | |
| 1806 | ;; Bind buffer-file-name to nil | |
| 1807 | ;; so that we don't try to lock the file. | |
| 1808 | (let ((buffer-file-name nil)) | |
| 1809 | (or auto-save-p | |
| f9456b0a RS |
1810 | (unlock-buffer))) |
| 1811 | (insert-file-contents file-name (not auto-save-p) | |
| 1812 | nil nil t))) | |
| b4da00e9 | 1813 | (goto-char (min opoint (point-max))) |
| 8cfb9d46 | 1814 | (after-find-file nil nil t) |
| 4fbf62ee KH |
1815 | (run-hooks 'after-revert-hook) |
| 1816 | t))))) | |
| b4da00e9 RM |
1817 | |
| 1818 | (defun recover-file (file) | |
| 1819 | "Visit file FILE, but get contents from its last auto-save file." | |
| 1820 | (interactive | |
| 1821 | (let ((prompt-file buffer-file-name) | |
| 1822 | (file-name nil) | |
| 1823 | (file-dir nil)) | |
| 1824 | (and prompt-file | |
| 1825 | (setq file-name (file-name-nondirectory prompt-file) | |
| 1826 | file-dir (file-name-directory prompt-file))) | |
| 1827 | (list (read-file-name "Recover file: " | |
| 1828 | file-dir nil nil file-name)))) | |
| 1829 | (setq file (expand-file-name file)) | |
| f7da6740 RS |
1830 | (if (auto-save-file-name-p (file-name-nondirectory file)) |
| 1831 | (error "%s is an auto-save file" file)) | |
| b4da00e9 RM |
1832 | (let ((file-name (let ((buffer-file-name file)) |
| 1833 | (make-auto-save-file-name)))) | |
| 1834 | (cond ((not (file-newer-than-file-p file-name file)) | |
| 1835 | (error "Auto-save file %s not current" file-name)) | |
| 1836 | ((save-window-excursion | |
| 1837 | (if (not (eq system-type 'vax-vms)) | |
| 1838 | (with-output-to-temp-buffer "*Directory*" | |
| 1839 | (buffer-disable-undo standard-output) | |
| 1840 | (call-process "ls" nil standard-output nil | |
| 2dc2b736 RS |
1841 | (if (file-symlink-p file) "-lL" "-l") |
| 1842 | file file-name))) | |
| b4da00e9 RM |
1843 | (yes-or-no-p (format "Recover auto save file %s? " file-name))) |
| 1844 | (switch-to-buffer (find-file-noselect file t)) | |
| 1845 | (let ((buffer-read-only nil)) | |
| 1846 | (erase-buffer) | |
| 1847 | (insert-file-contents file-name nil)) | |
| 8cfb9d46 | 1848 | (after-find-file nil nil t)) |
| b4da00e9 RM |
1849 | (t (error "Recover-file cancelled."))))) |
| 1850 | ||
| 1851 | (defun kill-some-buffers () | |
| 1852 | "For each buffer, ask whether to kill it." | |
| 1853 | (interactive) | |
| 1854 | (let ((list (buffer-list))) | |
| 1855 | (while list | |
| 1856 | (let* ((buffer (car list)) | |
| 1857 | (name (buffer-name buffer))) | |
| 1858 | (and (not (string-equal name "")) | |
| 1859 | (/= (aref name 0) ? ) | |
| 1860 | (yes-or-no-p | |
| 1861 | (format "Buffer %s %s. Kill? " | |
| 1862 | name | |
| 1863 | (if (buffer-modified-p buffer) | |
| 1864 | "HAS BEEN EDITED" "is unmodified"))) | |
| 1865 | (kill-buffer buffer))) | |
| 1866 | (setq list (cdr list))))) | |
| 1867 | \f | |
| 1868 | (defun auto-save-mode (arg) | |
| 1869 | "Toggle auto-saving of contents of current buffer. | |
| f3e23606 | 1870 | With prefix argument ARG, turn auto-saving on if positive, else off." |
| b4da00e9 RM |
1871 | (interactive "P") |
| 1872 | (setq buffer-auto-save-file-name | |
| 1873 | (and (if (null arg) | |
| 1874 | (not buffer-auto-save-file-name) | |
| 1875 | (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0)))) | |
| 1876 | (if (and buffer-file-name auto-save-visited-file-name | |
| 1877 | (not buffer-read-only)) | |
| 1878 | buffer-file-name | |
| 1879 | (make-auto-save-file-name)))) | |
| 1880 | (if (interactive-p) | |
| 1881 | (message "Auto-save %s (in this buffer)" | |
| 1882 | (if buffer-auto-save-file-name "on" "off"))) | |
| 1883 | buffer-auto-save-file-name) | |
| 1884 | ||
| 1885 | (defun rename-auto-save-file () | |
| 1886 | "Adjust current buffer's auto save file name for current conditions. | |
| 1887 | Also rename any existing auto save file, if it was made in this session." | |
| 1888 | (let ((osave buffer-auto-save-file-name)) | |
| 1889 | (setq buffer-auto-save-file-name | |
| 1890 | (make-auto-save-file-name)) | |
| 1891 | (if (and osave buffer-auto-save-file-name | |
| 1892 | (not (string= buffer-auto-save-file-name buffer-file-name)) | |
| 1893 | (not (string= buffer-auto-save-file-name osave)) | |
| 1894 | (file-exists-p osave) | |
| 1895 | (recent-auto-save-p)) | |
| 1896 | (rename-file osave buffer-auto-save-file-name t)))) | |
| 1897 | ||
| 1898 | (defun make-auto-save-file-name () | |
| 1899 | "Return file name to use for auto-saves of current buffer. | |
| 1900 | Does not consider `auto-save-visited-file-name' as that variable is checked | |
| 1901 | before calling this function. You can redefine this for customization. | |
| 1902 | See also `auto-save-file-name-p'." | |
| 1903 | (if buffer-file-name | |
| 1904 | (concat (file-name-directory buffer-file-name) | |
| 1905 | "#" | |
| 1906 | (file-name-nondirectory buffer-file-name) | |
| 1907 | "#") | |
| 1908 | ;; For non-file bfr, use bfr name and Emacs pid. | |
| 1909 | (expand-file-name (format "#%s#%s#" (buffer-name) (make-temp-name ""))))) | |
| 1910 | ||
| 1911 | (defun auto-save-file-name-p (filename) | |
| 1912 | "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'. | |
| 1913 | FILENAME should lack slashes. You can redefine this for customization." | |
| 1914 | (string-match "^#.*#$" filename)) | |
| 1915 | \f | |
| 1916 | (defconst list-directory-brief-switches | |
| 1917 | (if (eq system-type 'vax-vms) "" "-CF") | |
| 1918 | "*Switches for list-directory to pass to `ls' for brief listing,") | |
| 1919 | ||
| 1920 | (defconst list-directory-verbose-switches | |
| 1921 | (if (eq system-type 'vax-vms) | |
| 1922 | "/PROTECTION/SIZE/DATE/OWNER/WIDTH=(OWNER:10)" | |
| 1923 | "-l") | |
| 1924 | "*Switches for list-directory to pass to `ls' for verbose listing,") | |
| 1925 | ||
| 1926 | (defun list-directory (dirname &optional verbose) | |
| 1927 | "Display a list of files in or matching DIRNAME, a la `ls'. | |
| 1928 | DIRNAME is globbed by the shell if necessary. | |
| 1929 | Prefix arg (second arg if noninteractive) means supply -l switch to `ls'. | |
| 1930 | Actions controlled by variables `list-directory-brief-switches' | |
| 1931 | and `list-directory-verbose-switches'." | |
| 1932 | (interactive (let ((pfx current-prefix-arg)) | |
| 1933 | (list (read-file-name (if pfx "List directory (verbose): " | |
| 1934 | "List directory (brief): ") | |
| 1935 | nil default-directory nil) | |
| 1936 | pfx))) | |
| 1937 | (let ((switches (if verbose list-directory-verbose-switches | |
| 1938 | list-directory-brief-switches))) | |
| 1939 | (or dirname (setq dirname default-directory)) | |
| 1940 | (setq dirname (expand-file-name dirname)) | |
| 1941 | (with-output-to-temp-buffer "*Directory*" | |
| 1942 | (buffer-disable-undo standard-output) | |
| 1943 | (princ "Directory ") | |
| 1944 | (princ dirname) | |
| 1945 | (terpri) | |
| c3554e95 RS |
1946 | (save-excursion |
| 1947 | (set-buffer "*Directory*") | |
| 1948 | (let ((wildcard (not (file-directory-p dirname)))) | |
| 1949 | (insert-directory dirname switches wildcard (not wildcard))))))) | |
| 1950 | ||
| 1951 | (defvar insert-directory-program "ls" | |
| 1952 | "Absolute or relative name of the `ls' program used by `insert-directory'.") | |
| 1953 | ||
| 1954 | ;; insert-directory | |
| 1955 | ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and | |
| 1956 | ;; FULL-DIRECTORY-P is nil. | |
| 1957 | ;; The single line of output must display FILE's name as it was | |
| 1958 | ;; given, namely, an absolute path name. | |
| 1959 | ;; - must insert exactly one line for each file if WILDCARD or | |
| 1960 | ;; FULL-DIRECTORY-P is t, plus one optional "total" line | |
| 1961 | ;; before the file lines, plus optional text after the file lines. | |
| 1962 | ;; Lines are delimited by "\n", so filenames containing "\n" are not | |
| 1963 | ;; allowed. | |
| 1964 | ;; File lines should display the basename. | |
| 1965 | ;; - must be consistent with | |
| 1966 | ;; - functions dired-move-to-filename, (these two define what a file line is) | |
| 1967 | ;; dired-move-to-end-of-filename, | |
| 1968 | ;; dired-between-files, (shortcut for (not (dired-move-to-filename))) | |
| 1969 | ;; dired-insert-headerline | |
| 1970 | ;; dired-after-subdir-garbage (defines what a "total" line is) | |
| 1971 | ;; - variable dired-subdir-regexp | |
| 1972 | (defun insert-directory (file switches &optional wildcard full-directory-p) | |
| a18b7c81 | 1973 | "Insert directory listing for FILE, formatted according to SWITCHES. |
| c3554e95 RS |
1974 | Leaves point after the inserted text. |
| 1975 | Optional third arg WILDCARD means treat FILE as shell wildcard. | |
| 1976 | Optional fourth arg FULL-DIRECTORY-P means file is a directory and | |
| 1977 | switches do not contain `d', so that a full listing is expected. | |
| 1978 | ||
| 1979 | This works by running a directory listing program | |
| 406e12d9 | 1980 | whose name is in the variable `insert-directory-program'. |
| c3554e95 | 1981 | If WILDCARD, it also runs the shell specified by `shell-file-name'." |
| 5dbfdacd | 1982 | (let ((handler (find-file-name-handler file))) |
| c3554e95 RS |
1983 | (if handler |
| 1984 | (funcall handler 'insert-directory file switches | |
| 1985 | wildcard full-directory-p) | |
| b4da00e9 | 1986 | (if (eq system-type 'vax-vms) |
| c3554e95 RS |
1987 | (vms-read-directory file switches (current-buffer)) |
| 1988 | (if wildcard | |
| a9fa0bd5 RS |
1989 | ;; Run ls in the directory of the file pattern we asked for. |
| 1990 | (let ((default-directory | |
| 1991 | (if (file-name-absolute-p file) | |
| 1992 | (file-name-directory file) | |
| 6e2dc7cb RS |
1993 | (file-name-directory (expand-file-name file)))) |
| 1994 | (pattern (file-name-nondirectory file)) | |
| 1995 | (beg 0)) | |
| 1996 | ;; Quote some characters that have special meanings in shells; | |
| 1997 | ;; but don't quote the wildcards--we want them to be special. | |
| 1998 | ;; We also currently don't quote the quoting characters | |
| 1999 | ;; in case people want to use them explicitly to quote | |
| 2000 | ;; wildcard characters. | |
| 2001 | (while (string-match "[ \t\n;<>&|{}()#$]" pattern beg) | |
| 2002 | (setq pattern | |
| 2003 | (concat (substring pattern 0 (match-beginning 0)) | |
| 2004 | "\\" | |
| 2005 | (substring pattern (match-beginning 0))) | |
| 2006 | beg (1+ (match-end 0)))) | |
| c3554e95 RS |
2007 | (call-process shell-file-name nil t nil |
| 2008 | "-c" (concat insert-directory-program | |
| 2009 | " -d " switches " " | |
| 6e2dc7cb | 2010 | pattern))) |
| a18b7c81 JB |
2011 | ;; SunOS 4.1.3, SVr4 and others need the "." to list the |
| 2012 | ;; directory if FILE is a symbolic link. | |
| 2013 | (call-process insert-directory-program nil t nil switches | |
| 2014 | (if full-directory-p | |
| 2015 | (concat (file-name-as-directory file) ".") | |
| 2016 | file))))))) | |
| b4da00e9 | 2017 | |
| 88902b35 RS |
2018 | (defvar kill-emacs-query-functions nil |
| 2019 | "Functions to call with no arguments to query about killing Emacs.") | |
| 2020 | ||
| b4da00e9 RM |
2021 | (defun save-buffers-kill-emacs (&optional arg) |
| 2022 | "Offer to save each buffer, then kill this Emacs process. | |
| 2023 | With prefix arg, silently save all file-visiting buffers, then kill." | |
| 2024 | (interactive "P") | |
| 2025 | (save-some-buffers arg t) | |
| 2026 | (and (or (not (memq t (mapcar (function | |
| 2027 | (lambda (buf) (and (buffer-file-name buf) | |
| 2028 | (buffer-modified-p buf)))) | |
| 2029 | (buffer-list)))) | |
| 2030 | (yes-or-no-p "Modified buffers exist; exit anyway? ")) | |
| 2031 | (or (not (fboundp 'process-list)) | |
| 2032 | ;; process-list is not defined on VMS. | |
| 2033 | (let ((processes (process-list)) | |
| 2034 | active) | |
| 2035 | (while processes | |
| 528415e7 | 2036 | (and (memq (process-status (car processes)) '(run stop open)) |
| b4da00e9 RM |
2037 | (let ((val (process-kill-without-query (car processes)))) |
| 2038 | (process-kill-without-query (car processes) val) | |
| 2039 | val) | |
| 2040 | (setq active t)) | |
| 2041 | (setq processes (cdr processes))) | |
| 2042 | (or (not active) | |
| 2043 | (yes-or-no-p "Active processes exist; kill them and exit anyway? ")))) | |
| 88902b35 RS |
2044 | ;; Query the user for other things, perhaps. |
| 2045 | (let ((functions kill-emacs-query-functions) | |
| 2046 | (yes t)) | |
| 2047 | (while (and functions yes) | |
| 2048 | (setq yes (and yes (funcall (car functions)))) | |
| 2049 | (setq functions (cdr functions))) | |
| 2050 | yes) | |
| b4da00e9 RM |
2051 | (kill-emacs))) |
| 2052 | \f | |
| 2053 | (define-key ctl-x-map "\C-f" 'find-file) | |
| 2054 | (define-key ctl-x-map "\C-q" 'toggle-read-only) | |
| 2055 | (define-key ctl-x-map "\C-r" 'find-file-read-only) | |
| 2056 | (define-key ctl-x-map "\C-v" 'find-alternate-file) | |
| 2057 | (define-key ctl-x-map "\C-s" 'save-buffer) | |
| 2058 | (define-key ctl-x-map "s" 'save-some-buffers) | |
| 2059 | (define-key ctl-x-map "\C-w" 'write-file) | |
| 2060 | (define-key ctl-x-map "i" 'insert-file) | |
| 2061 | (define-key esc-map "~" 'not-modified) | |
| 2062 | (define-key ctl-x-map "\C-d" 'list-directory) | |
| 2063 | (define-key ctl-x-map "\C-c" 'save-buffers-kill-emacs) | |
| 2064 | ||
| 2065 | (define-key ctl-x-4-map "f" 'find-file-other-window) | |
| 2066 | (define-key ctl-x-4-map "r" 'find-file-read-only-other-window) | |
| 2067 | (define-key ctl-x-4-map "\C-f" 'find-file-other-window) | |
| 2068 | (define-key ctl-x-4-map "b" 'switch-to-buffer-other-window) | |
| 924f0a24 | 2069 | (define-key ctl-x-4-map "\C-o" 'display-buffer) |
| 5bbbceb1 | 2070 | |
| f98955ea JB |
2071 | (define-key ctl-x-5-map "b" 'switch-to-buffer-other-frame) |
| 2072 | (define-key ctl-x-5-map "f" 'find-file-other-frame) | |
| 2073 | (define-key ctl-x-5-map "\C-f" 'find-file-other-frame) | |
| 2074 | (define-key ctl-x-5-map "r" 'find-file-read-only-other-frame) | |
| c0274f38 ER |
2075 | |
| 2076 | ;;; files.el ends here |