| 1 | ;;; files.el --- file input and output commands for Emacs |
| 2 | |
| 3 | ;; Copyright (C) 1985, 1986, 1987, 1992 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; This file is part of GNU Emacs. |
| 6 | |
| 7 | ;; GNU Emacs is free software; you can redistribute it and/or modify |
| 8 | ;; it under the terms of the GNU General Public License as published by |
| 9 | ;; the Free Software Foundation; either version 1, or (at your option) |
| 10 | ;; any later version. |
| 11 | |
| 12 | ;; GNU Emacs is distributed in the hope that it will be useful, |
| 13 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | ;; GNU General Public License for more details. |
| 16 | |
| 17 | ;; You should have received a copy of the GNU General Public License |
| 18 | ;; along with GNU Emacs; see the file COPYING. If not, write to |
| 19 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | |
| 21 | (defconst delete-auto-save-files t |
| 22 | "*Non-nil means delete a buffer's auto-save file when the buffer is saved.") |
| 23 | |
| 24 | (defconst directory-abbrev-alist |
| 25 | nil |
| 26 | "*Alist of abbreviations for file directories. |
| 27 | A list of elements of the form (FROM . TO), each meaning to replace |
| 28 | FROM with TO when it appears in a directory name. This replacement is |
| 29 | done when setting up the default directory of a newly visited file. |
| 30 | *Every* FROM string should start with `^'. |
| 31 | |
| 32 | Use this feature when you have directories which you normally refer to |
| 33 | via absolute symbolic links. Make TO the name of the link, and FROM |
| 34 | the name it is linked to.") |
| 35 | |
| 36 | ;;; Turn off backup files on VMS since it has version numbers. |
| 37 | (defconst make-backup-files (not (eq system-type 'vax-vms)) |
| 38 | "*Create a backup of each file when it is saved for the first time. |
| 39 | This can be done by renaming the file or by copying. |
| 40 | |
| 41 | Renaming means that Emacs renames the existing file so that it is a |
| 42 | backup file, then writes the buffer into a new file. Any other names |
| 43 | that the old file had will now refer to the backup file. The new file |
| 44 | is owned by you and its group is defaulted. |
| 45 | |
| 46 | Copying means that Emacs copies the existing file into the backup |
| 47 | file, then writes the buffer on top of the existing file. Any other |
| 48 | names that the old file had will now refer to the new (edited) file. |
| 49 | The file's owner and group are unchanged. |
| 50 | |
| 51 | The choice of renaming or copying is controlled by the variables |
| 52 | `backup-by-copying', `backup-by-copying-when-linked' and |
| 53 | `backup-by-copying-when-mismatch'.") |
| 54 | |
| 55 | ;; Do this so that local variables based on the file name |
| 56 | ;; are not overridden by the major mode. |
| 57 | (defvar backup-inhibited nil |
| 58 | "Non-nil means don't make a backup file for this buffer.") |
| 59 | (put 'backup-inhibited 'permanent-local t) |
| 60 | |
| 61 | (defconst backup-by-copying nil |
| 62 | "*Non-nil means always use copying to create backup files. |
| 63 | See documentation of variable `make-backup-files'.") |
| 64 | |
| 65 | (defconst backup-by-copying-when-linked nil |
| 66 | "*Non-nil means use copying to create backups for files with multiple names. |
| 67 | This causes the alternate names to refer to the latest version as edited. |
| 68 | This variable is relevant only if `backup-by-copying' is nil.") |
| 69 | |
| 70 | (defconst backup-by-copying-when-mismatch nil |
| 71 | "*Non-nil means create backups by copying if this preserves owner or group. |
| 72 | Renaming may still be used (subject to control of other variables) |
| 73 | when it would not result in changing the owner or group of the file; |
| 74 | that is, for files which are owned by you and whose group matches |
| 75 | the default for a new file created there by you. |
| 76 | This variable is relevant only if `backup-by-copying' is nil.") |
| 77 | |
| 78 | (defvar backup-enable-predicate |
| 79 | '(lambda (name) |
| 80 | (or (< (length name) 5) |
| 81 | (not (string-equal "/tmp/" (substring name 0 5))))) |
| 82 | "Predicate that looks at a file name and decides whether to make backups. |
| 83 | Called with an absolute file name as argument, it returns t to enable backup.") |
| 84 | |
| 85 | (defconst buffer-offer-save nil |
| 86 | "*Non-nil in a buffer means offer to save the buffer on exit |
| 87 | even if the buffer is not visiting a file. |
| 88 | Automatically local in all buffers.") |
| 89 | (make-variable-buffer-local 'buffer-offer-save) |
| 90 | |
| 91 | (defconst file-precious-flag nil |
| 92 | "*Non-nil means protect against I/O errors while saving files. |
| 93 | Some modes set this non-nil in particular buffers.") |
| 94 | |
| 95 | (defvar version-control nil |
| 96 | "*Control use of version numbers for backup files. |
| 97 | t means make numeric backup versions unconditionally. |
| 98 | nil means make them for files that have some already. |
| 99 | never means do not make them.") |
| 100 | |
| 101 | (defvar dired-kept-versions 2 |
| 102 | "*When cleaning directory, number of versions to keep.") |
| 103 | |
| 104 | (defvar trim-versions-without-asking nil |
| 105 | "*If true, deletes excess backup versions silently. |
| 106 | Otherwise asks confirmation.") |
| 107 | |
| 108 | (defvar kept-old-versions 2 |
| 109 | "*Number of oldest versions to keep when a new numbered backup is made.") |
| 110 | |
| 111 | (defvar kept-new-versions 2 |
| 112 | "*Number of newest versions to keep when a new numbered backup is made. |
| 113 | Includes the new backup. Must be > 0") |
| 114 | |
| 115 | (defconst require-final-newline nil |
| 116 | "*Value of t says silently ensure a file ends in a newline when it is saved. |
| 117 | Non-nil but not t says ask user whether to add a newline when there isn't one. |
| 118 | nil means don't add newlines.") |
| 119 | |
| 120 | (defconst auto-save-default t |
| 121 | "*Non-nil says by default do auto-saving of every file-visiting buffer.") |
| 122 | |
| 123 | (defconst auto-save-visited-file-name nil |
| 124 | "*Non-nil says auto-save a buffer in the file it is visiting, when practical. |
| 125 | Normally auto-save files are written under other names.") |
| 126 | |
| 127 | (defconst save-abbrevs nil |
| 128 | "*Non-nil means save word abbrevs too when files are saved. |
| 129 | Loading an abbrev file sets this to t.") |
| 130 | |
| 131 | (defconst find-file-run-dired t |
| 132 | "*Non-nil says run dired if find-file is given the name of a directory.") |
| 133 | |
| 134 | (put 'find-file-not-found-hooks 'permanent-local t) |
| 135 | (defvar find-file-not-found-hooks nil |
| 136 | "List of functions to be called for `find-file' on nonexistent file. |
| 137 | These functions are called as soon as the error is detected. |
| 138 | `buffer-file-name' is already set up. |
| 139 | The functions are called in the order given until one of them returns non-nil.") |
| 140 | |
| 141 | (put 'find-file-hooks 'permanent-local t) |
| 142 | (defvar find-file-hooks nil |
| 143 | "List of functions to be called after a buffer is loaded from a file. |
| 144 | The buffer's local variables (if any) will have been processed before the |
| 145 | functions are called.") |
| 146 | |
| 147 | (put 'write-file-hooks 'permanent-local t) |
| 148 | (defvar write-file-hooks nil |
| 149 | "List of functions to be called before writing out a buffer to a file. |
| 150 | If one of them returns non-nil, the file is considered already written |
| 151 | and the rest are not called. |
| 152 | These hooks are considered to pertain to the visited file. |
| 153 | So this list is cleared if you change the visited file name. |
| 154 | See also `write-contents-hooks'.") |
| 155 | |
| 156 | (defvar write-contents-hooks nil |
| 157 | "List of functions to be called before writing out a buffer to a file. |
| 158 | If one of them returns non-nil, the file is considered already written |
| 159 | and the rest are not called. |
| 160 | These hooks are considered to pertain to the buffer's contents, |
| 161 | not to the particular visited file; thus, `set-visited-file-name' does |
| 162 | not clear this variable, but changing the major mode does clear it. |
| 163 | See also `write-file-hooks'.") |
| 164 | |
| 165 | (defconst enable-local-variables t |
| 166 | "*Control use of local-variables lists in files you visit. |
| 167 | The value can be t, nil or something else. |
| 168 | A value of t means local-variables lists are obeyed; |
| 169 | nil means they are ignored; anything else means query. |
| 170 | |
| 171 | The command \\[normal-mode] always obeys local-variables lists |
| 172 | and ignores this variable.") |
| 173 | |
| 174 | (defconst enable-local-eval nil |
| 175 | "*Control processing of the \"variable\" `eval' in a file's local variables. |
| 176 | The value can be t, nil or something else. |
| 177 | A value of t means obey `eval' variables; |
| 178 | nil means ignore them; anything else means query. |
| 179 | |
| 180 | The command \\[normal-mode] always obeys local-variables lists |
| 181 | and ignores this variable.") |
| 182 | |
| 183 | ;; Avoid losing in versions where CLASH_DETECTION is disabled. |
| 184 | (or (fboundp 'lock-buffer) |
| 185 | (fset 'lock-buffer 'ignore)) |
| 186 | (or (fboundp 'unlock-buffer) |
| 187 | (fset 'unlock-buffer 'ignore)) |
| 188 | \f |
| 189 | (defun pwd () |
| 190 | "Show the current default directory." |
| 191 | (interactive nil) |
| 192 | (message "Directory %s" default-directory)) |
| 193 | |
| 194 | (defun cd (dir) |
| 195 | "Make DIR become the current buffer's default directory." |
| 196 | (interactive "DChange default directory: ") |
| 197 | (setq dir (expand-file-name dir)) |
| 198 | (if (not (eq system-type 'vax-vms)) |
| 199 | (setq dir (file-name-as-directory dir))) |
| 200 | (if (not (file-directory-p dir)) |
| 201 | (error "%s is not a directory" dir) |
| 202 | (if (file-executable-p dir) |
| 203 | (setq default-directory dir) |
| 204 | (error "Cannot cd to %s: Permission denied" dir))) |
| 205 | ;; We used to call pwd at this point. That's not terribly helpful |
| 206 | ;; when we're invoking cd interactively, and the new cmushell-based |
| 207 | ;; shell has its own (better) facilities for this. |
| 208 | ) |
| 209 | |
| 210 | (defun load-file (file) |
| 211 | "Load the Lisp file named FILE." |
| 212 | (interactive "fLoad file: ") |
| 213 | (load (expand-file-name file) nil nil t)) |
| 214 | |
| 215 | (defun load-library (library) |
| 216 | "Load the library named LIBRARY. |
| 217 | This is an interface to the function `load'." |
| 218 | (interactive "sLoad library: ") |
| 219 | (load library)) |
| 220 | \f |
| 221 | (defun switch-to-buffer-other-window (buffer) |
| 222 | "Select buffer BUFFER in another window." |
| 223 | (interactive "BSwitch to buffer in other window: ") |
| 224 | (let ((pop-up-windows t)) |
| 225 | (pop-to-buffer buffer t))) |
| 226 | |
| 227 | (defun switch-to-buffer-other-screen (buffer) |
| 228 | "Switch to buffer BUFFER in another screen." |
| 229 | (interactive "BSwitch to buffer in other screen: ") |
| 230 | (let ((pop-up-screens t)) |
| 231 | (pop-to-buffer buffer))) |
| 232 | |
| 233 | (defun find-file (filename) |
| 234 | "Edit file FILENAME. |
| 235 | Switch to a buffer visiting file FILENAME, |
| 236 | creating one if none already exists." |
| 237 | (interactive "FFind file: ") |
| 238 | (switch-to-buffer (find-file-noselect filename))) |
| 239 | |
| 240 | (defun find-file-other-window (filename) |
| 241 | "Edit file FILENAME, in another window. |
| 242 | May create a new window, or reuse an existing one. |
| 243 | See the function `display-buffer'." |
| 244 | (interactive "FFind file in other window: ") |
| 245 | (switch-to-buffer-other-window (find-file-noselect filename))) |
| 246 | |
| 247 | (defun find-file-other-screen (filename) |
| 248 | "Edit file FILENAME, in another screen. |
| 249 | May create a new screen, or reuse an existing one. |
| 250 | See the function `display-buffer'." |
| 251 | (interactive "FFind file in other screen: ") |
| 252 | (switch-to-buffer-other-screen (find-file-noselect filename))) |
| 253 | |
| 254 | (defun find-file-read-only (filename) |
| 255 | "Edit file FILENAME but don't allow changes. |
| 256 | Like \\[find-file] but marks buffer as read-only. |
| 257 | Use \\[toggle-read-only] to permit editing." |
| 258 | (interactive "fFind file read-only: ") |
| 259 | (find-file filename) |
| 260 | (setq buffer-read-only t)) |
| 261 | |
| 262 | (defun find-file-read-only-other-window (filename) |
| 263 | "Edit file FILENAME in another window but don't allow changes. |
| 264 | Like \\[find-file-other-window] but marks buffer as read-only. |
| 265 | Use \\[toggle-read-only] to permit editing." |
| 266 | (interactive "fFind file read-only other window: ") |
| 267 | (find-file filename) |
| 268 | (setq buffer-read-only t)) |
| 269 | |
| 270 | (defun find-file-read-only-other-screen (filename) |
| 271 | "Edit file FILENAME in another screen but don't allow changes. |
| 272 | Like \\[find-file-other-screen] but marks buffer as read-only. |
| 273 | Use \\[toggle-read-only] to permit editing." |
| 274 | (interactive "fFind file read-only other screen: ") |
| 275 | (find-file-other-screen filename) |
| 276 | (setq buffer-read-only t)) |
| 277 | |
| 278 | (defun find-alternate-file (filename) |
| 279 | "Find file FILENAME, select its buffer, kill previous buffer. |
| 280 | If the current buffer now contains an empty file that you just visited |
| 281 | \(presumably by mistake), use this command to visit the file you really want." |
| 282 | (interactive |
| 283 | (let ((file buffer-file-name) |
| 284 | (file-name nil) |
| 285 | (file-dir nil)) |
| 286 | (and file |
| 287 | (setq file-name (file-name-nondirectory file) |
| 288 | file-dir (file-name-directory file))) |
| 289 | (list (read-file-name "Find alternate file: " file-dir nil nil file-name)))) |
| 290 | (and (buffer-modified-p) |
| 291 | ;; (not buffer-read-only) |
| 292 | (not (yes-or-no-p (format "Buffer %s is modified; kill anyway? " |
| 293 | (buffer-name)))) |
| 294 | (error "Aborted")) |
| 295 | (let ((obuf (current-buffer)) |
| 296 | (ofile buffer-file-name) |
| 297 | (oname (buffer-name))) |
| 298 | (rename-buffer " **lose**") |
| 299 | (setq buffer-file-name nil) |
| 300 | (unwind-protect |
| 301 | (progn |
| 302 | (unlock-buffer) |
| 303 | (find-file filename)) |
| 304 | (cond ((eq obuf (current-buffer)) |
| 305 | (setq buffer-file-name ofile) |
| 306 | (lock-buffer) |
| 307 | (rename-buffer oname)))) |
| 308 | (or (eq (current-buffer) obuf) |
| 309 | (kill-buffer obuf)))) |
| 310 | |
| 311 | (defun create-file-buffer (filename) |
| 312 | "Create a suitably named buffer for visiting FILENAME, and return it. |
| 313 | FILENAME (sans directory) is used unchanged if that name is free; |
| 314 | otherwise a string <2> or <3> or ... is appended to get an unused name." |
| 315 | (let ((lastname (file-name-nondirectory filename))) |
| 316 | (if (string= lastname "") |
| 317 | (setq lastname filename)) |
| 318 | (generate-new-buffer lastname))) |
| 319 | |
| 320 | (defun generate-new-buffer (name) |
| 321 | "Create and return a buffer with a name based on NAME. |
| 322 | Choose the buffer's name using generate-new-buffer-name." |
| 323 | (get-buffer-create (generate-new-buffer-name name))) |
| 324 | |
| 325 | (defun abbreviate-file-name (filename) |
| 326 | "Return a version of FILENAME shortened using directory-abbrev-alist. |
| 327 | This also substitutes \"~\" for the user's home directory. |
| 328 | See \\[describe-variable] directory-abbrev-alist RET for more information." |
| 329 | (let ((tail directory-abbrev-alist)) |
| 330 | (while tail |
| 331 | (if (string-match (car (car tail)) filename) |
| 332 | (setq filename |
| 333 | (concat (cdr (car tail)) (substring filename (match-end 0))))) |
| 334 | (setq tail (cdr tail))) |
| 335 | (if (string-match (concat "^" (expand-file-name "~")) filename) |
| 336 | (setq filename |
| 337 | (concat "~" (substring filename (match-end 0))))) |
| 338 | filename)) |
| 339 | |
| 340 | (defun find-file-noselect (filename &optional nowarn) |
| 341 | "Read file FILENAME into a buffer and return the buffer. |
| 342 | If a buffer exists visiting FILENAME, return that one, but |
| 343 | verify that the file has not changed since visited or saved. |
| 344 | The buffer is not selected, just returned to the caller." |
| 345 | (setq filename (expand-file-name filename)) |
| 346 | ;; Get rid of the prefixes added by the automounter. |
| 347 | (if (and (string-match "^/tmp_mnt/" filename) |
| 348 | (file-exists-p (file-name-directory |
| 349 | (substring filename (1- (match-end 0)))))) |
| 350 | (setq filename (substring filename (1- (match-end 0))))) |
| 351 | (setq filename (abbreviate-file-name filename)) |
| 352 | (if (file-directory-p filename) |
| 353 | (if find-file-run-dired |
| 354 | (dired-noselect filename) |
| 355 | (error "%s is a directory." filename)) |
| 356 | (let ((buf (get-file-buffer filename)) |
| 357 | error) |
| 358 | (if buf |
| 359 | (or nowarn |
| 360 | (verify-visited-file-modtime buf) |
| 361 | (cond ((not (file-exists-p filename)) |
| 362 | (error "File %s no longer exists!" filename)) |
| 363 | ((yes-or-no-p |
| 364 | (format |
| 365 | (if (buffer-modified-p buf) |
| 366 | "File %s changed on disk. Discard your edits? " |
| 367 | "File %s changed on disk. Read the new version? ") |
| 368 | (file-name-nondirectory filename))) |
| 369 | (save-excursion |
| 370 | (set-buffer buf) |
| 371 | (revert-buffer t t))))) |
| 372 | (save-excursion |
| 373 | (let* ((link-name (car (file-attributes filename))) |
| 374 | (linked-buf (and (stringp link-name) |
| 375 | (get-file-buffer link-name)))) |
| 376 | (if (bufferp linked-buf) |
| 377 | (message "Symbolic link to file in buffer %s" |
| 378 | (buffer-name linked-buf)))) |
| 379 | (setq buf (create-file-buffer filename)) |
| 380 | (set-buffer buf) |
| 381 | (erase-buffer) |
| 382 | (condition-case () |
| 383 | (insert-file-contents filename t) |
| 384 | (file-error |
| 385 | (setq error t) |
| 386 | ;; Run find-file-not-found-hooks until one returns non-nil. |
| 387 | (let ((hooks find-file-not-found-hooks)) |
| 388 | (while (and hooks |
| 389 | (not (funcall (car hooks)))) |
| 390 | (setq hooks (cdr hooks)))))) |
| 391 | ;; Set buffer's default directory to that of the file. |
| 392 | (setq default-directory (file-name-directory filename)) |
| 393 | ;; Turn off backup files for certain file names. Since |
| 394 | ;; this is a permanent local, the major mode won't eliminate it. |
| 395 | (and (not (funcall backup-enable-predicate buffer-file-name)) |
| 396 | (progn |
| 397 | (make-local-variable 'backup-inhibited) |
| 398 | (setq backup-inhibited t))) |
| 399 | (after-find-file error (not nowarn)))) |
| 400 | buf))) |
| 401 | \f |
| 402 | (defun after-find-file (&optional error warn) |
| 403 | "Called after finding a file and by the default revert function. |
| 404 | Sets buffer mode, parses local variables. |
| 405 | Optional args ERROR and WARN: ERROR non-nil means there was an |
| 406 | error in reading the file. WARN non-nil means warn if there |
| 407 | exists an auto-save file more recent than the visited file. |
| 408 | Finishes by calling the functions in `find-file-hooks'." |
| 409 | (setq buffer-read-only (not (file-writable-p buffer-file-name))) |
| 410 | (if noninteractive |
| 411 | nil |
| 412 | (let* (not-serious |
| 413 | (msg |
| 414 | (cond ((and error (file-attributes buffer-file-name)) |
| 415 | (setq buffer-read-only t) |
| 416 | "File exists, but is read-protected.") |
| 417 | ((not buffer-read-only) |
| 418 | (if (and warn |
| 419 | (file-newer-than-file-p (make-auto-save-file-name) |
| 420 | buffer-file-name)) |
| 421 | "Auto save file is newer; consider M-x recover-file" |
| 422 | (setq not-serious t) |
| 423 | (if error "(New file)" nil))) |
| 424 | ((not error) |
| 425 | (setq not-serious t) |
| 426 | "Note: file is write protected") |
| 427 | ((file-attributes (directory-file-name default-directory)) |
| 428 | "File not found and directory write-protected") |
| 429 | (t |
| 430 | ;; If the directory the buffer is in doesn't exist, |
| 431 | ;; offer to create it. It's better to do this now |
| 432 | ;; than when we save the buffer, because we want |
| 433 | ;; autosaving to work. |
| 434 | (setq buffer-read-only nil) |
| 435 | (or (file-exists-p (file-name-directory buffer-file-name)) |
| 436 | (if (yes-or-no-p |
| 437 | (format |
| 438 | "The directory containing %s does not exist. Create? " |
| 439 | (abbreviate-file-name buffer-file-name))) |
| 440 | (make-directory-path |
| 441 | (file-name-directory buffer-file-name)))) |
| 442 | nil)))) |
| 443 | (if msg |
| 444 | (progn |
| 445 | (message msg) |
| 446 | (or not-serious (sit-for 1 nil t))))) |
| 447 | (if auto-save-default |
| 448 | (auto-save-mode t))) |
| 449 | (normal-mode t) |
| 450 | (mapcar 'funcall find-file-hooks)) |
| 451 | |
| 452 | (defun normal-mode (&optional find-file) |
| 453 | "Choose the major mode for this buffer automatically. |
| 454 | Also sets up any specified local variables of the file. |
| 455 | Uses the visited file name, the -*- line, and the local variables spec. |
| 456 | |
| 457 | This function is called automatically from `find-file'. In that case, |
| 458 | we may set up specified local variables depending on the value of |
| 459 | `enable-local-variables': if it is t, we do; if it is nil, we don't; |
| 460 | otherwise, we query. `enable-local-variables' is ignored if you |
| 461 | run `normal-mode' explicitly." |
| 462 | (interactive) |
| 463 | (or find-file (funcall (or default-major-mode 'fundamental-mode))) |
| 464 | (condition-case err |
| 465 | (set-auto-mode) |
| 466 | (error (message "File mode specification error: %s" |
| 467 | (prin1-to-string err)))) |
| 468 | (condition-case err |
| 469 | (let ((enable-local-variables (or (not find-file) |
| 470 | enable-local-variables))) |
| 471 | (hack-local-variables)) |
| 472 | (error (message "File local-variables error: %s" |
| 473 | (prin1-to-string err))))) |
| 474 | |
| 475 | (defvar auto-mode-alist (mapcar 'purecopy |
| 476 | '(("\\.text\\'" . text-mode) |
| 477 | ("\\.c\\'" . c-mode) |
| 478 | ("\\.h\\'" . c-mode) |
| 479 | ("\\.tex\\'" . TeX-mode) |
| 480 | ("\\.ltx\\'" . LaTeX-mode) |
| 481 | ("\\.el\\'" . emacs-lisp-mode) |
| 482 | ("\\.mm\\'" . nroff-mode) |
| 483 | ("\\.me\\'" . nroff-mode) |
| 484 | ("\\.[12345678]\\'" . nroff-mode) |
| 485 | ("\\.scm\\'" . scheme-mode) |
| 486 | ("\\.l\\'" . lisp-mode) |
| 487 | ("\\.lisp\\'" . lisp-mode) |
| 488 | ("\\.f\\'" . fortran-mode) |
| 489 | ("\\.for\\'" . fortran-mode) |
| 490 | ("\\.mss\\'" . scribe-mode) |
| 491 | ("\\.pl\\'" . prolog-mode) |
| 492 | ("\\.cc\\'" . c++-mode) |
| 493 | ("\\.C\\'" . c++-mode) |
| 494 | ;;; Less common extensions come here |
| 495 | ;;; so more common ones above are found faster. |
| 496 | ("\\.s\\'" . asm-mode) |
| 497 | ("ChangeLog\\'" . change-log-mode) |
| 498 | ("\\$CHANGE_LOG\\$\\.TXT" . change-log-mode) |
| 499 | ("\\.TeX\\'" . TeX-mode) |
| 500 | ("\\.sty\\'" . LaTeX-mode) |
| 501 | ("\\.bbl\\'" . LaTeX-mode) |
| 502 | ("\\.bib\\'" . bibtex-mode) |
| 503 | ("\\.article\\'" . text-mode) |
| 504 | ("\\.letter\\'" . text-mode) |
| 505 | ("\\.texinfo\\'" . texinfo-mode) |
| 506 | ("\\.lsp\\'" . lisp-mode) |
| 507 | ("\\.awk\\'" . awk-mode) |
| 508 | ("\\.prolog\\'" . prolog-mode) |
| 509 | ;; Mailer puts message to be edited in |
| 510 | ;; /tmp/Re.... or Message |
| 511 | ("^/tmp/Re" . text-mode) |
| 512 | ("/Message[0-9]*\\'" . text-mode) |
| 513 | ;; some news reader is reported to use this |
| 514 | ("^/tmp/fol/" . text-mode) |
| 515 | ("\\.y\\'" . c-mode) |
| 516 | ("\\.oak\\'" . scheme-mode) |
| 517 | ("\\.scm.[0-9]*\\'" . scheme-mode) |
| 518 | ;; .emacs following a directory delimiter |
| 519 | ;; in either Unix or VMS syntax. |
| 520 | ("[]>:/]\\..*emacs\\'" . emacs-lisp-mode) |
| 521 | ("\\.ml\\'" . lisp-mode))) |
| 522 | "\ |
| 523 | Alist of filename patterns vs corresponding major mode functions. |
| 524 | Each element looks like (REGEXP . FUNCTION). |
| 525 | Visiting a file whose name matches REGEXP causes FUNCTION to be called.") |
| 526 | |
| 527 | (defun set-auto-mode () |
| 528 | "Select major mode appropriate for current buffer. |
| 529 | This checks for a -*- mode tag in the buffer's text, or |
| 530 | compares the filename against the entries in auto-mode-alist. It does |
| 531 | not check for the \"mode:\" local variable in the Local Variables |
| 532 | section of the file; for that, use `hack-local-variables'. |
| 533 | |
| 534 | If enable-local-variables is nil, this function will not check for a |
| 535 | -*- mode tag." |
| 536 | ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*- |
| 537 | (let (beg end mode) |
| 538 | (save-excursion |
| 539 | (goto-char (point-min)) |
| 540 | (skip-chars-forward " \t\n") |
| 541 | (if (and enable-local-variables |
| 542 | (search-forward "-*-" (save-excursion (end-of-line) (point)) t) |
| 543 | (progn |
| 544 | (skip-chars-forward " \t") |
| 545 | (setq beg (point)) |
| 546 | (search-forward "-*-" |
| 547 | (save-excursion (end-of-line) (point)) |
| 548 | t)) |
| 549 | (progn |
| 550 | (forward-char -3) |
| 551 | (skip-chars-backward " \t") |
| 552 | (setq end (point)) |
| 553 | (goto-char beg) |
| 554 | (if (search-forward ":" end t) |
| 555 | (progn |
| 556 | (goto-char beg) |
| 557 | (if (let ((case-fold-search t)) |
| 558 | (search-forward "mode:" end t)) |
| 559 | (progn |
| 560 | (skip-chars-forward " \t") |
| 561 | (setq beg (point)) |
| 562 | (if (search-forward ";" end t) |
| 563 | (forward-char -1) |
| 564 | (goto-char end)) |
| 565 | (skip-chars-backward " \t") |
| 566 | (setq mode (buffer-substring beg (point)))))) |
| 567 | (setq mode (buffer-substring beg end))))) |
| 568 | (setq mode (intern (concat (downcase mode) "-mode"))) |
| 569 | (let ((alist auto-mode-alist) |
| 570 | (name buffer-file-name)) |
| 571 | (let ((case-fold-search (eq system-type 'vax-vms))) |
| 572 | ;; Remove backup-suffixes from file name. |
| 573 | (setq name (file-name-sans-versions name)) |
| 574 | ;; Find first matching alist entry. |
| 575 | (while (and (not mode) alist) |
| 576 | (if (string-match (car (car alist)) name) |
| 577 | (setq mode (cdr (car alist)))) |
| 578 | (setq alist (cdr alist))))))) |
| 579 | (if mode (funcall mode)))) |
| 580 | |
| 581 | (defun hack-local-variables () |
| 582 | "Parse (and bind or evaluate as appropriate) any local variables |
| 583 | for current buffer." |
| 584 | ;; Look for "Local variables:" line in last page. |
| 585 | (save-excursion |
| 586 | (goto-char (point-max)) |
| 587 | (search-backward "\n\^L" (max (- (point-max) 3000) (point-min)) 'move) |
| 588 | (if (let ((case-fold-search t)) |
| 589 | (and (search-forward "Local Variables:" nil t) |
| 590 | (or (eq enable-local-variables t) |
| 591 | (and enable-local-variables |
| 592 | (save-window-excursion |
| 593 | (switch-to-buffer (current-buffer)) |
| 594 | (save-excursion |
| 595 | (beginning-of-line) |
| 596 | (set-window-start (selected-window) (point))) |
| 597 | (y-or-n-p (format "Set local variables as specified at end of %s? " |
| 598 | (file-name-nondirectory buffer-file-name)))))))) |
| 599 | (let ((continue t) |
| 600 | prefix prefixlen suffix beg) |
| 601 | ;; The prefix is what comes before "local variables:" in its line. |
| 602 | ;; The suffix is what comes after "local variables:" in its line. |
| 603 | (skip-chars-forward " \t") |
| 604 | (or (eolp) |
| 605 | (setq suffix (buffer-substring (point) |
| 606 | (progn (end-of-line) (point))))) |
| 607 | (goto-char (match-beginning 0)) |
| 608 | (or (bolp) |
| 609 | (setq prefix |
| 610 | (buffer-substring (point) |
| 611 | (progn (beginning-of-line) (point))))) |
| 612 | |
| 613 | (if prefix (setq prefixlen (length prefix) |
| 614 | prefix (regexp-quote prefix))) |
| 615 | (if suffix (setq suffix (concat (regexp-quote suffix) "$"))) |
| 616 | (while continue |
| 617 | ;; Look at next local variable spec. |
| 618 | (if selective-display (re-search-forward "[\n\C-m]") |
| 619 | (forward-line 1)) |
| 620 | ;; Skip the prefix, if any. |
| 621 | (if prefix |
| 622 | (if (looking-at prefix) |
| 623 | (forward-char prefixlen) |
| 624 | (error "Local variables entry is missing the prefix"))) |
| 625 | ;; Find the variable name; strip whitespace. |
| 626 | (skip-chars-forward " \t") |
| 627 | (setq beg (point)) |
| 628 | (skip-chars-forward "^:\n") |
| 629 | (if (eolp) (error "Missing colon in local variables entry")) |
| 630 | (skip-chars-backward " \t") |
| 631 | (let* ((str (buffer-substring beg (point))) |
| 632 | (var (read str)) |
| 633 | val) |
| 634 | ;; Setting variable named "end" means end of list. |
| 635 | (if (string-equal (downcase str) "end") |
| 636 | (setq continue nil) |
| 637 | ;; Otherwise read the variable value. |
| 638 | (skip-chars-forward "^:") |
| 639 | (forward-char 1) |
| 640 | (setq val (read (current-buffer))) |
| 641 | (skip-chars-backward "\n") |
| 642 | (skip-chars-forward " \t") |
| 643 | (or (if suffix (looking-at suffix) (eolp)) |
| 644 | (error "Local variables entry is terminated incorrectly")) |
| 645 | ;; Set the variable. "Variables" mode and eval are funny. |
| 646 | (cond ((eq var 'mode) |
| 647 | (funcall (intern (concat (downcase (symbol-name val)) |
| 648 | "-mode")))) |
| 649 | ((eq var 'eval) |
| 650 | (if (and (not (string= (user-login-name) "root")) |
| 651 | (or (eq enable-local-eval t) |
| 652 | (and enable-local-eval |
| 653 | (save-window-excursion |
| 654 | (switch-to-buffer (current-buffer)) |
| 655 | (save-excursion |
| 656 | (beginning-of-line) |
| 657 | (set-window-start (selected-window) (point))) |
| 658 | (y-or-n-p (format "Process `eval' local variable in file %s? " |
| 659 | (file-name-nondirectory buffer-file-name))))))) |
| 660 | (save-excursion (eval val)) |
| 661 | (message "Ignoring `eval:' in file's local variables"))) |
| 662 | (t (make-local-variable var) |
| 663 | (set var val)))))))))) |
| 664 | \f |
| 665 | (defun set-visited-file-name (filename) |
| 666 | "Change name of file visited in current buffer to FILENAME. |
| 667 | The next time the buffer is saved it will go in the newly specified file. |
| 668 | nil or empty string as argument means make buffer not be visiting any file. |
| 669 | Remember to delete the initial contents of the minibuffer |
| 670 | if you wish to pass an empty string as the argument." |
| 671 | (interactive "FSet visited file name: ") |
| 672 | (if filename |
| 673 | (setq filename |
| 674 | (if (string-equal filename "") |
| 675 | nil |
| 676 | (expand-file-name filename)))) |
| 677 | (or (equal filename buffer-file-name) |
| 678 | (null filename) |
| 679 | (progn |
| 680 | (lock-buffer filename) |
| 681 | (unlock-buffer))) |
| 682 | (setq buffer-file-name filename) |
| 683 | (if filename ; make buffer name reflect filename. |
| 684 | (let ((new-name (file-name-nondirectory buffer-file-name))) |
| 685 | (if (string= new-name "") |
| 686 | (error "Empty file name")) |
| 687 | (if (eq system-type 'vax-vms) |
| 688 | (setq new-name (downcase new-name))) |
| 689 | (setq default-directory (file-name-directory buffer-file-name)) |
| 690 | (rename-buffer new-name t))) |
| 691 | (setq buffer-backed-up nil) |
| 692 | (clear-visited-file-modtime) |
| 693 | ;; write-file-hooks is normally used for things like ftp-find-file |
| 694 | ;; that visit things that are not local files as if they were files. |
| 695 | ;; Changing to visit an ordinary local file instead should flush the hook. |
| 696 | (kill-local-variable 'write-file-hooks) |
| 697 | (kill-local-variable 'revert-buffer-function) |
| 698 | (kill-local-variable 'backup-inhibited) |
| 699 | ;; Turn off backup files for certain file names. |
| 700 | ;; Since this is a permanent local, the major mode won't eliminate it. |
| 701 | (and (not (funcall backup-enable-predicate buffer-file-name)) |
| 702 | (progn |
| 703 | (make-local-variable 'backup-inhibited) |
| 704 | (setq backup-inhibited t))) |
| 705 | ;; If auto-save was not already on, turn it on if appropriate. |
| 706 | (if (not buffer-auto-save-file-name) |
| 707 | (auto-save-mode (and buffer-file-name auto-save-default))) |
| 708 | (if buffer-file-name |
| 709 | (set-buffer-modified-p t))) |
| 710 | |
| 711 | (defun write-file (filename) |
| 712 | "Write current buffer into file FILENAME. |
| 713 | Makes buffer visit that file, and marks it not modified." |
| 714 | ;; (interactive "FWrite file: ") |
| 715 | (interactive |
| 716 | (list (if buffer-file-name |
| 717 | (read-file-name "Write file: " |
| 718 | nil nil nil nil) |
| 719 | (read-file-name "Write file: " |
| 720 | (cdr (assq 'default-directory |
| 721 | (buffer-local-variables))) |
| 722 | nil nil (buffer-name))))) |
| 723 | (or (null filename) (string-equal filename "") |
| 724 | (set-visited-file-name filename)) |
| 725 | (set-buffer-modified-p t) |
| 726 | (save-buffer)) |
| 727 | \f |
| 728 | (defun backup-buffer () |
| 729 | "Make a backup of the disk file visited by the current buffer, if appropriate. |
| 730 | This is normally done before saving the buffer the first time. |
| 731 | If the value is non-nil, it is the result of `file-modes' on the original |
| 732 | file; this means that the caller, after saving the buffer, should change |
| 733 | the modes of the new file to agree with the old modes." |
| 734 | (if (and make-backup-files (not backup-inhibited) |
| 735 | (not buffer-backed-up) |
| 736 | (file-exists-p buffer-file-name) |
| 737 | (memq (aref (elt (file-attributes buffer-file-name) 8) 0) |
| 738 | '(?- ?l))) |
| 739 | (let ((real-file-name buffer-file-name) |
| 740 | backup-info backupname targets setmodes) |
| 741 | ;; If specified name is a symbolic link, chase it to the target. |
| 742 | ;; Thus we make the backups in the directory where the real file is. |
| 743 | (while (let ((tem (file-symlink-p real-file-name))) |
| 744 | (if tem |
| 745 | (setq real-file-name |
| 746 | (expand-file-name tem |
| 747 | (file-name-directory real-file-name)))) |
| 748 | tem)) |
| 749 | (setq backup-info (find-backup-file-name real-file-name) |
| 750 | backupname (car backup-info) |
| 751 | targets (cdr backup-info)) |
| 752 | ;;; (if (file-directory-p buffer-file-name) |
| 753 | ;;; (error "Cannot save buffer in directory %s" buffer-file-name)) |
| 754 | (condition-case () |
| 755 | (let ((delete-old-versions |
| 756 | ;; If have old versions to maybe delete, |
| 757 | ;; ask the user to confirm now, before doing anything. |
| 758 | ;; But don't actually delete til later. |
| 759 | (and targets |
| 760 | (or trim-versions-without-asking |
| 761 | (y-or-n-p (format "Delete excess backup versions of %s? " |
| 762 | real-file-name)))))) |
| 763 | ;; Actually write the back up file. |
| 764 | (condition-case () |
| 765 | (if (or file-precious-flag |
| 766 | ; (file-symlink-p buffer-file-name) |
| 767 | backup-by-copying |
| 768 | (and backup-by-copying-when-linked |
| 769 | (> (file-nlinks real-file-name) 1)) |
| 770 | (and backup-by-copying-when-mismatch |
| 771 | (let ((attr (file-attributes real-file-name))) |
| 772 | (or (nth 9 attr) |
| 773 | (/= (nth 2 attr) (user-uid)))))) |
| 774 | (copy-file real-file-name backupname t t) |
| 775 | ; rename-file should delete old backup. |
| 776 | ; (condition-case () |
| 777 | ; (delete-file backupname) |
| 778 | ; (file-error nil)) |
| 779 | (rename-file real-file-name backupname t) |
| 780 | (setq setmodes (file-modes backupname))) |
| 781 | (file-error |
| 782 | ;; If trouble writing the backup, write it in ~. |
| 783 | (setq backupname (expand-file-name "~/%backup%~")) |
| 784 | (message "Cannot write backup file; backing up in ~/%%backup%%~") |
| 785 | (sleep-for 1) |
| 786 | (copy-file real-file-name backupname t t))) |
| 787 | (setq buffer-backed-up t) |
| 788 | ;; Now delete the old versions, if desired. |
| 789 | (if delete-old-versions |
| 790 | (while targets |
| 791 | (condition-case () |
| 792 | (delete-file (car targets)) |
| 793 | (file-error nil)) |
| 794 | (setq targets (cdr targets)))) |
| 795 | setmodes) |
| 796 | (file-error nil))))) |
| 797 | |
| 798 | (defun file-name-sans-versions (name) |
| 799 | "Return FILENAME sans backup versions or strings. |
| 800 | This is a separate procedure so your site-init or startup file can |
| 801 | redefine it." |
| 802 | (substring name 0 |
| 803 | (if (eq system-type 'vax-vms) |
| 804 | ;; VMS version number is (a) semicolon, optional |
| 805 | ;; sign, zero or more digits or (b) period, option |
| 806 | ;; sign, zero or more digits, provided this is the |
| 807 | ;; second period encountered outside of the |
| 808 | ;; device/directory part of the file name. |
| 809 | (or (string-match ";[---+]?[0-9]*\\'" name) |
| 810 | (if (string-match "\\.[^]>:]*\\(\\.[---+]?[0-9]*\\)\\'" |
| 811 | name) |
| 812 | (match-beginning 1)) |
| 813 | (length name)) |
| 814 | (or (string-match "\\.~[0-9]+~\\'" name) |
| 815 | (string-match "~\\'" name) |
| 816 | (length name))))) |
| 817 | |
| 818 | (defun make-backup-file-name (file) |
| 819 | "Create the non-numeric backup file name for FILE. |
| 820 | This is a separate function so you can redefine it for customization." |
| 821 | (concat file "~")) |
| 822 | |
| 823 | (defun backup-file-name-p (file) |
| 824 | "Return non-nil if FILE is a backup file name (numeric or not). |
| 825 | This is a separate function so you can redefine it for customization. |
| 826 | You may need to redefine `file-name-sans-versions' as well." |
| 827 | (string-match "~$" file)) |
| 828 | |
| 829 | ;; I believe there is no need to alter this behavior for VMS; |
| 830 | ;; since backup files are not made on VMS, it should not get called. |
| 831 | (defun find-backup-file-name (fn) |
| 832 | "Find a file name for a backup file, and suggestions for deletions. |
| 833 | Value is a list whose car is the name for the backup file |
| 834 | and whose cdr is a list of old versions to consider deleting now." |
| 835 | (if (eq version-control 'never) |
| 836 | (list (make-backup-file-name fn)) |
| 837 | (let* ((base-versions (concat (file-name-nondirectory fn) ".~")) |
| 838 | (bv-length (length base-versions)) |
| 839 | (possibilities (file-name-all-completions |
| 840 | base-versions |
| 841 | (file-name-directory fn))) |
| 842 | (versions (sort (mapcar |
| 843 | (function |
| 844 | (lambda (fn) |
| 845 | (if (and (string-match "[0-9]+~$" fn bv-length) |
| 846 | (= (match-beginning 0) bv-length)) |
| 847 | (string-to-int (substring fn bv-length -1)) |
| 848 | 0))) |
| 849 | possibilities) |
| 850 | '<)) |
| 851 | (high-water-mark (apply 'max 0 versions)) |
| 852 | (deserve-versions-p |
| 853 | (or version-control |
| 854 | (> high-water-mark 0))) |
| 855 | (number-to-delete (- (length versions) |
| 856 | kept-old-versions kept-new-versions -1))) |
| 857 | (if (not deserve-versions-p) |
| 858 | (list (make-backup-file-name fn)) |
| 859 | (cons (concat fn ".~" (int-to-string (1+ high-water-mark)) "~") |
| 860 | (if (> number-to-delete 0) |
| 861 | (mapcar (function (lambda (n) |
| 862 | (concat fn ".~" (int-to-string n) "~"))) |
| 863 | (let ((v (nthcdr kept-old-versions versions))) |
| 864 | (rplacd (nthcdr (1- number-to-delete) v) ()) |
| 865 | v)))))))) |
| 866 | |
| 867 | (defun file-nlinks (filename) |
| 868 | "Return number of names file FILENAME has." |
| 869 | (car (cdr (file-attributes filename)))) |
| 870 | \f |
| 871 | (defun save-buffer (&optional args) |
| 872 | "Save current buffer in visited file if modified. Versions described below. |
| 873 | By default, makes the previous version into a backup file |
| 874 | if previously requested or if this is the first save. |
| 875 | With 1 or 3 \\[universal-argument]'s, marks this version |
| 876 | to become a backup when the next save is done. |
| 877 | With 2 or 3 \\[universal-argument]'s, |
| 878 | unconditionally makes the previous version into a backup file. |
| 879 | With argument of 0, never makes the previous version into a backup file. |
| 880 | |
| 881 | If a file's name is FOO, the names of its numbered backup versions are |
| 882 | FOO.~i~ for various integers i. A non-numbered backup file is called FOO~. |
| 883 | Numeric backups (rather than FOO~) will be made if value of |
| 884 | `version-control' is not the atom `never' and either there are already |
| 885 | numeric versions of the file being backed up, or `version-control' is |
| 886 | non-nil. |
| 887 | We don't want excessive versions piling up, so there are variables |
| 888 | `kept-old-versions', which tells Emacs how many oldest versions to keep, |
| 889 | and `kept-new-versions', which tells how many newest versions to keep. |
| 890 | Defaults are 2 old versions and 2 new. |
| 891 | `dired-kept-versions' controls dired's clean-directory (.) command. |
| 892 | If `trim-versions-without-asking' is nil, system will query user |
| 893 | before trimming versions. Otherwise it does it silently." |
| 894 | (interactive "p") |
| 895 | (let ((modp (buffer-modified-p)) |
| 896 | (large (> (buffer-size) 50000)) |
| 897 | (make-backup-files (and make-backup-files (not (eq args 0))))) |
| 898 | (and modp (memq args '(16 64)) (setq buffer-backed-up nil)) |
| 899 | (if (and modp large) (message "Saving file %s..." (buffer-file-name))) |
| 900 | (basic-save-buffer) |
| 901 | (and modp (memq args '(4 64)) (setq buffer-backed-up nil)))) |
| 902 | |
| 903 | (defun delete-auto-save-file-if-necessary (&optional force) |
| 904 | "Delete auto-save file for current buffer if `delete-auto-save-files' is t. |
| 905 | Normally delete only if the file was written by this Emacs since |
| 906 | the last real save, but optional arg FORCE non-nil means delete anyway." |
| 907 | (and buffer-auto-save-file-name delete-auto-save-files |
| 908 | (not (string= buffer-file-name buffer-auto-save-file-name)) |
| 909 | (or force (recent-auto-save-p)) |
| 910 | (progn |
| 911 | (condition-case () |
| 912 | (delete-file buffer-auto-save-file-name) |
| 913 | (file-error nil)) |
| 914 | (set-buffer-auto-saved)))) |
| 915 | |
| 916 | (defun basic-save-buffer () |
| 917 | "Save the current buffer in its visited file, if it has been modified." |
| 918 | (interactive) |
| 919 | (if (buffer-modified-p) |
| 920 | (let ((recent-save (recent-auto-save-p)) |
| 921 | setmodes tempsetmodes) |
| 922 | ;; On VMS, rename file and buffer to get rid of version number. |
| 923 | (if (and (eq system-type 'vax-vms) |
| 924 | (not (string= buffer-file-name |
| 925 | (file-name-sans-versions buffer-file-name)))) |
| 926 | (let (buffer-new-name) |
| 927 | ;; Strip VMS version number before save. |
| 928 | (setq buffer-file-name |
| 929 | (file-name-sans-versions buffer-file-name)) |
| 930 | ;; Construct a (unique) buffer name to correspond. |
| 931 | (let ((buf (create-file-buffer (downcase buffer-file-name)))) |
| 932 | (setq buffer-new-name (buffer-name buf)) |
| 933 | (kill-buffer buf)) |
| 934 | (rename-buffer buffer-new-name))) |
| 935 | ;; If buffer has no file name, ask user for one. |
| 936 | (or buffer-file-name |
| 937 | (progn |
| 938 | (setq buffer-file-name |
| 939 | (expand-file-name (read-file-name "File to save in: ") nil) |
| 940 | default-directory (file-name-directory buffer-file-name)) |
| 941 | (auto-save-mode auto-save-default))) |
| 942 | (or (verify-visited-file-modtime (current-buffer)) |
| 943 | (not (file-exists-p buffer-file-name)) |
| 944 | (yes-or-no-p |
| 945 | (format "%s has changed since visited or saved. Save anyway? " |
| 946 | (file-name-nondirectory buffer-file-name))) |
| 947 | (error "Save not confirmed")) |
| 948 | (save-restriction |
| 949 | (widen) |
| 950 | (and (> (point-max) 1) |
| 951 | (/= (char-after (1- (point-max))) ?\n) |
| 952 | (or (eq require-final-newline t) |
| 953 | (and require-final-newline |
| 954 | (y-or-n-p |
| 955 | (format "Buffer %s does not end in newline. Add one? " |
| 956 | (buffer-name))))) |
| 957 | (save-excursion |
| 958 | (goto-char (point-max)) |
| 959 | (insert ?\n))) |
| 960 | (let ((hooks (append write-contents-hooks write-file-hooks)) |
| 961 | (done nil)) |
| 962 | (while (and hooks |
| 963 | (not (setq done (funcall (car hooks))))) |
| 964 | (setq hooks (cdr hooks))) |
| 965 | ;; If a hook returned t, file is already "written". |
| 966 | (cond ((not done) |
| 967 | (if (not (file-writable-p buffer-file-name)) |
| 968 | (let ((dir (file-name-directory buffer-file-name))) |
| 969 | (if (not (file-directory-p dir)) |
| 970 | (error "%s is not a directory" dir) |
| 971 | (if (not (file-exists-p buffer-file-name)) |
| 972 | (error "Directory %s write-protected" dir) |
| 973 | (if (yes-or-no-p |
| 974 | (format "File %s is write-protected; try to save anyway? " |
| 975 | (file-name-nondirectory |
| 976 | buffer-file-name))) |
| 977 | (setq tempsetmodes t) |
| 978 | (error "Attempt to save to a file which you aren't allowed to write")))))) |
| 979 | (or buffer-backed-up |
| 980 | (setq setmodes (backup-buffer))) |
| 981 | (if file-precious-flag |
| 982 | ;; If file is precious, rename it away before |
| 983 | ;; overwriting it. |
| 984 | (let ((rename t) |
| 985 | realname tempname temp) |
| 986 | ;; Chase symlinks; rename the ultimate actual file. |
| 987 | (setq realname buffer-file-name) |
| 988 | (while (setq temp (file-symlink-p realname)) |
| 989 | (setq realname temp)) |
| 990 | (setq tempname (concat realname "#")) |
| 991 | (condition-case () |
| 992 | (progn (rename-file realname tempname t) |
| 993 | (setq setmodes (file-modes tempname))) |
| 994 | (file-error (setq rename nil tempname nil))) |
| 995 | (if (file-directory-p realname) |
| 996 | (error "%s is a directory" realname)) |
| 997 | (unwind-protect |
| 998 | (progn (clear-visited-file-modtime) |
| 999 | (write-region (point-min) (point-max) |
| 1000 | realname nil t) |
| 1001 | (setq rename nil)) |
| 1002 | ;; If rename is still t, writing failed. |
| 1003 | ;; So rename the old file back to original name, |
| 1004 | (if rename |
| 1005 | (progn |
| 1006 | (rename-file tempname realname t) |
| 1007 | (clear-visited-file-modtime)) |
| 1008 | ;; Otherwise we don't need the original file, |
| 1009 | ;; so flush it, if we still have it. |
| 1010 | ;; If rename failed due to name length restriction |
| 1011 | ;; then TEMPNAME is now nil. |
| 1012 | (if tempname |
| 1013 | (condition-case () |
| 1014 | (delete-file tempname) |
| 1015 | (error nil)))))) |
| 1016 | ;; If file not writable, see if we can make it writable |
| 1017 | ;; temporarily while we write it. |
| 1018 | ;; But no need to do so if we have just backed it up |
| 1019 | ;; (setmodes is set) because that says we're superseding. |
| 1020 | (cond ((and tempsetmodes (not setmodes)) |
| 1021 | ;; Change the mode back, after writing. |
| 1022 | (setq setmodes (file-modes buffer-file-name)) |
| 1023 | (set-file-modes buffer-file-name 511))) |
| 1024 | (write-region (point-min) (point-max) |
| 1025 | buffer-file-name nil t))))) |
| 1026 | (if setmodes |
| 1027 | (condition-case () |
| 1028 | (set-file-modes buffer-file-name setmodes) |
| 1029 | (error nil)))) |
| 1030 | ;; If the auto-save file was recent before this command, |
| 1031 | ;; delete it now. |
| 1032 | (delete-auto-save-file-if-necessary recent-save) |
| 1033 | (run-hooks 'after-save-hooks)) |
| 1034 | (message "(No changes need to be saved)"))) |
| 1035 | |
| 1036 | (defun save-some-buffers (&optional arg exiting) |
| 1037 | "Save some modified file-visiting buffers. Asks user about each one. |
| 1038 | Optional argument (the prefix) non-nil means save all with no questions. |
| 1039 | Optional second argument EXITING means ask about certain non-file buffers |
| 1040 | as well as about file buffers." |
| 1041 | (interactive "P") |
| 1042 | (save-excursion |
| 1043 | (if (zerop (map-y-or-n-p |
| 1044 | (function |
| 1045 | (lambda (buffer) |
| 1046 | (and (buffer-modified-p buffer) |
| 1047 | (or |
| 1048 | (buffer-file-name buffer) |
| 1049 | (and exiting |
| 1050 | (progn |
| 1051 | (set-buffer buffer) |
| 1052 | (and buffer-offer-save (> (buffer-size) 0))))) |
| 1053 | (if arg |
| 1054 | t |
| 1055 | (if (buffer-file-name buffer) |
| 1056 | (format "Save file %s? " |
| 1057 | (buffer-file-name buffer)) |
| 1058 | (format "Save buffer %s? " |
| 1059 | (buffer-name buffer))))))) |
| 1060 | (function |
| 1061 | (lambda (buffer) |
| 1062 | (set-buffer buffer) |
| 1063 | (save-buffer))) |
| 1064 | (buffer-list) |
| 1065 | '("buffer" "buffers" "save"))) |
| 1066 | (message "(No files need saving)")))) |
| 1067 | \f |
| 1068 | (defun not-modified (&optional arg) |
| 1069 | "Mark current buffer as unmodified, not needing to be saved. |
| 1070 | With prefix arg, mark buffer as modified, so \\[save-buffer] will save." |
| 1071 | (interactive "P") |
| 1072 | (message (if arg "Modification-flag set" |
| 1073 | "Modification-flag cleared")) |
| 1074 | (set-buffer-modified-p arg)) |
| 1075 | |
| 1076 | (defun toggle-read-only (&optional arg) |
| 1077 | "Change whether this buffer is visiting its file read-only. |
| 1078 | With arg, set read-only iff arg is positive." |
| 1079 | (interactive "P") |
| 1080 | (setq buffer-read-only |
| 1081 | (if (null arg) |
| 1082 | (not buffer-read-only) |
| 1083 | (> (prefix-numeric-value arg) 0))) |
| 1084 | ;; Force mode-line redisplay |
| 1085 | (set-buffer-modified-p (buffer-modified-p))) |
| 1086 | |
| 1087 | (defun insert-file (filename) |
| 1088 | "Insert contents of file FILENAME into buffer after point. |
| 1089 | Set mark after the inserted text. |
| 1090 | |
| 1091 | This function is meant for the user to run interactively. |
| 1092 | Don't call it from programs! Use `insert-file-contents' instead. |
| 1093 | \(Its calling sequence is different; see its documentation)." |
| 1094 | (interactive "fInsert file: ") |
| 1095 | (let ((tem (insert-file-contents filename))) |
| 1096 | (push-mark (+ (point) (car (cdr tem)))))) |
| 1097 | |
| 1098 | (defun append-to-file (start end filename) |
| 1099 | "Append the contents of the region to the end of file FILENAME. |
| 1100 | When called from a function, expects three arguments, |
| 1101 | START, END and FILENAME. START and END are buffer positions |
| 1102 | saying what text to write." |
| 1103 | (interactive "r\nFAppend to file: ") |
| 1104 | (write-region start end filename t)) |
| 1105 | |
| 1106 | (defun file-newest-backup (filename) |
| 1107 | "Return most recent backup file for FILENAME or nil if no backups exist." |
| 1108 | (let* ((filename (expand-file-name filename)) |
| 1109 | (file (file-name-nondirectory filename)) |
| 1110 | (dir (file-name-directory filename)) |
| 1111 | (comp (file-name-all-completions file dir)) |
| 1112 | newest) |
| 1113 | (while comp |
| 1114 | (setq file (concat dir (car comp)) |
| 1115 | comp (cdr comp)) |
| 1116 | (if (and (backup-file-name-p file) |
| 1117 | (or (null newest) (file-newer-than-file-p file newest))) |
| 1118 | (setq newest file))) |
| 1119 | newest)) |
| 1120 | |
| 1121 | (defun rename-uniquely () |
| 1122 | "Rename current buffer to a similar name not already taken. |
| 1123 | This function is useful for creating multiple shell process buffers |
| 1124 | or multiple mail buffers, etc." |
| 1125 | (interactive) |
| 1126 | (let* ((new-buf (generate-new-buffer (buffer-name))) |
| 1127 | (name (buffer-name new-buf))) |
| 1128 | (kill-buffer new-buf) |
| 1129 | (rename-buffer name) |
| 1130 | (set-buffer-modified-p (buffer-modified-p)))) ; force mode line update |
| 1131 | |
| 1132 | (defun make-directory-path (path) |
| 1133 | "Create all the directories along path that don't exist yet." |
| 1134 | (interactive "Fdirectory path to create: ") |
| 1135 | (let ((path (directory-file-name (expand-file-name path))) |
| 1136 | create-list) |
| 1137 | (while (not (file-exists-p path)) |
| 1138 | (setq create-list (cons path create-list) |
| 1139 | path (directory-file-name (file-name-directory path)))) |
| 1140 | (while create-list |
| 1141 | (make-directory (car create-list)) |
| 1142 | (setq create-list (cdr create-list))))) |
| 1143 | |
| 1144 | \f |
| 1145 | (put 'revert-buffer-function 'permanent-local t) |
| 1146 | (defvar revert-buffer-function nil |
| 1147 | "Function to use to revert this buffer, or nil to do the default.") |
| 1148 | |
| 1149 | (put 'revert-buffer-insert-file-contents-function 'permanent-local t) |
| 1150 | (defvar revert-buffer-insert-file-contents-function nil |
| 1151 | "Function to use to insert contents when reverting this buffer. |
| 1152 | Gets two args, first the nominal file name to use, |
| 1153 | and second, t if reading the auto-save file.") |
| 1154 | |
| 1155 | (defun revert-buffer (&optional check-auto noconfirm) |
| 1156 | "Replace the buffer text with the text of the visited file on disk. |
| 1157 | This undoes all changes since the file was visited or saved. |
| 1158 | With a prefix argument, offer to revert from latest auto-save file, if |
| 1159 | that is more recent than the visited file. |
| 1160 | When called from lisp, this is the first argument, CHECK-AUTO; it is optional. |
| 1161 | Optional second argument NOCONFIRM means don't ask for confirmation at all. |
| 1162 | |
| 1163 | If the value of `revert-buffer-function' is non-nil, it is called to |
| 1164 | do the work." |
| 1165 | (interactive "P") |
| 1166 | (if revert-buffer-function |
| 1167 | (funcall revert-buffer-function (not check-auto) noconfirm) |
| 1168 | (let* ((opoint (point)) |
| 1169 | (auto-save-p (and check-auto (recent-auto-save-p) |
| 1170 | buffer-auto-save-file-name |
| 1171 | (file-readable-p buffer-auto-save-file-name) |
| 1172 | (y-or-n-p |
| 1173 | "Buffer has been auto-saved recently. Revert from auto-save file? "))) |
| 1174 | (file-name (if auto-save-p |
| 1175 | buffer-auto-save-file-name |
| 1176 | buffer-file-name))) |
| 1177 | (cond ((null file-name) |
| 1178 | (error "Buffer does not seem to be associated with any file")) |
| 1179 | ((or noconfirm |
| 1180 | (yes-or-no-p (format "Revert buffer from file %s? " |
| 1181 | file-name))) |
| 1182 | ;; If file was backed up but has changed since, |
| 1183 | ;; we shd make another backup. |
| 1184 | (and (not auto-save-p) |
| 1185 | (not (verify-visited-file-modtime (current-buffer))) |
| 1186 | (setq buffer-backed-up nil)) |
| 1187 | ;; Get rid of all undo records for this buffer. |
| 1188 | (or (eq buffer-undo-list t) |
| 1189 | (setq buffer-undo-list nil)) |
| 1190 | (let ((buffer-read-only nil) |
| 1191 | ;; Don't make undo records for the reversion. |
| 1192 | (buffer-undo-list t)) |
| 1193 | (if revert-buffer-insert-file-contents-function |
| 1194 | (funcall revert-buffer-insert-file-contents-function |
| 1195 | file-name auto-save-p) |
| 1196 | (if (not (file-exists-p file-name)) |
| 1197 | (error "File %s no longer exists!" file-name)) |
| 1198 | ;; Bind buffer-file-name to nil |
| 1199 | ;; so that we don't try to lock the file. |
| 1200 | (let ((buffer-file-name nil)) |
| 1201 | (or auto-save-p |
| 1202 | (unlock-buffer)) |
| 1203 | (erase-buffer)) |
| 1204 | (insert-file-contents file-name (not auto-save-p)))) |
| 1205 | (goto-char (min opoint (point-max))) |
| 1206 | (after-find-file nil) |
| 1207 | t))))) |
| 1208 | |
| 1209 | (defun recover-file (file) |
| 1210 | "Visit file FILE, but get contents from its last auto-save file." |
| 1211 | (interactive |
| 1212 | (let ((prompt-file buffer-file-name) |
| 1213 | (file-name nil) |
| 1214 | (file-dir nil)) |
| 1215 | (and prompt-file |
| 1216 | (setq file-name (file-name-nondirectory prompt-file) |
| 1217 | file-dir (file-name-directory prompt-file))) |
| 1218 | (list (read-file-name "Recover file: " |
| 1219 | file-dir nil nil file-name)))) |
| 1220 | (setq file (expand-file-name file)) |
| 1221 | (if (auto-save-file-name-p file) (error "%s is an auto-save file" file)) |
| 1222 | (let ((file-name (let ((buffer-file-name file)) |
| 1223 | (make-auto-save-file-name)))) |
| 1224 | (cond ((not (file-newer-than-file-p file-name file)) |
| 1225 | (error "Auto-save file %s not current" file-name)) |
| 1226 | ((save-window-excursion |
| 1227 | (if (not (eq system-type 'vax-vms)) |
| 1228 | (with-output-to-temp-buffer "*Directory*" |
| 1229 | (buffer-disable-undo standard-output) |
| 1230 | (call-process "ls" nil standard-output nil |
| 1231 | (if (file-symlink-p file) "-lL" "-l") |
| 1232 | file file-name))) |
| 1233 | (yes-or-no-p (format "Recover auto save file %s? " file-name))) |
| 1234 | (switch-to-buffer (find-file-noselect file t)) |
| 1235 | (let ((buffer-read-only nil)) |
| 1236 | (erase-buffer) |
| 1237 | (insert-file-contents file-name nil)) |
| 1238 | (after-find-file nil)) |
| 1239 | (t (error "Recover-file cancelled."))))) |
| 1240 | |
| 1241 | (defun kill-some-buffers () |
| 1242 | "For each buffer, ask whether to kill it." |
| 1243 | (interactive) |
| 1244 | (let ((list (buffer-list))) |
| 1245 | (while list |
| 1246 | (let* ((buffer (car list)) |
| 1247 | (name (buffer-name buffer))) |
| 1248 | (and (not (string-equal name "")) |
| 1249 | (/= (aref name 0) ? ) |
| 1250 | (yes-or-no-p |
| 1251 | (format "Buffer %s %s. Kill? " |
| 1252 | name |
| 1253 | (if (buffer-modified-p buffer) |
| 1254 | "HAS BEEN EDITED" "is unmodified"))) |
| 1255 | (kill-buffer buffer))) |
| 1256 | (setq list (cdr list))))) |
| 1257 | \f |
| 1258 | (defun auto-save-mode (arg) |
| 1259 | "Toggle auto-saving of contents of current buffer. |
| 1260 | With ARG, turn auto-saving on if positive, else off." |
| 1261 | (interactive "P") |
| 1262 | (setq buffer-auto-save-file-name |
| 1263 | (and (if (null arg) |
| 1264 | (not buffer-auto-save-file-name) |
| 1265 | (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0)))) |
| 1266 | (if (and buffer-file-name auto-save-visited-file-name |
| 1267 | (not buffer-read-only)) |
| 1268 | buffer-file-name |
| 1269 | (make-auto-save-file-name)))) |
| 1270 | (if (interactive-p) |
| 1271 | (message "Auto-save %s (in this buffer)" |
| 1272 | (if buffer-auto-save-file-name "on" "off"))) |
| 1273 | buffer-auto-save-file-name) |
| 1274 | |
| 1275 | (defun rename-auto-save-file () |
| 1276 | "Adjust current buffer's auto save file name for current conditions. |
| 1277 | Also rename any existing auto save file, if it was made in this session." |
| 1278 | (let ((osave buffer-auto-save-file-name)) |
| 1279 | (setq buffer-auto-save-file-name |
| 1280 | (make-auto-save-file-name)) |
| 1281 | (if (and osave buffer-auto-save-file-name |
| 1282 | (not (string= buffer-auto-save-file-name buffer-file-name)) |
| 1283 | (not (string= buffer-auto-save-file-name osave)) |
| 1284 | (file-exists-p osave) |
| 1285 | (recent-auto-save-p)) |
| 1286 | (rename-file osave buffer-auto-save-file-name t)))) |
| 1287 | |
| 1288 | (defun make-auto-save-file-name () |
| 1289 | "Return file name to use for auto-saves of current buffer. |
| 1290 | Does not consider `auto-save-visited-file-name' as that variable is checked |
| 1291 | before calling this function. You can redefine this for customization. |
| 1292 | See also `auto-save-file-name-p'." |
| 1293 | (if buffer-file-name |
| 1294 | (concat (file-name-directory buffer-file-name) |
| 1295 | "#" |
| 1296 | (file-name-nondirectory buffer-file-name) |
| 1297 | "#") |
| 1298 | ;; For non-file bfr, use bfr name and Emacs pid. |
| 1299 | (expand-file-name (format "#%s#%s#" (buffer-name) (make-temp-name ""))))) |
| 1300 | |
| 1301 | (defun auto-save-file-name-p (filename) |
| 1302 | "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'. |
| 1303 | FILENAME should lack slashes. You can redefine this for customization." |
| 1304 | (string-match "^#.*#$" filename)) |
| 1305 | \f |
| 1306 | (defconst list-directory-brief-switches |
| 1307 | (if (eq system-type 'vax-vms) "" "-CF") |
| 1308 | "*Switches for list-directory to pass to `ls' for brief listing,") |
| 1309 | |
| 1310 | (defconst list-directory-verbose-switches |
| 1311 | (if (eq system-type 'vax-vms) |
| 1312 | "/PROTECTION/SIZE/DATE/OWNER/WIDTH=(OWNER:10)" |
| 1313 | "-l") |
| 1314 | "*Switches for list-directory to pass to `ls' for verbose listing,") |
| 1315 | |
| 1316 | (defun list-directory (dirname &optional verbose) |
| 1317 | "Display a list of files in or matching DIRNAME, a la `ls'. |
| 1318 | DIRNAME is globbed by the shell if necessary. |
| 1319 | Prefix arg (second arg if noninteractive) means supply -l switch to `ls'. |
| 1320 | Actions controlled by variables `list-directory-brief-switches' |
| 1321 | and `list-directory-verbose-switches'." |
| 1322 | (interactive (let ((pfx current-prefix-arg)) |
| 1323 | (list (read-file-name (if pfx "List directory (verbose): " |
| 1324 | "List directory (brief): ") |
| 1325 | nil default-directory nil) |
| 1326 | pfx))) |
| 1327 | (let ((switches (if verbose list-directory-verbose-switches |
| 1328 | list-directory-brief-switches))) |
| 1329 | (or dirname (setq dirname default-directory)) |
| 1330 | (setq dirname (expand-file-name dirname)) |
| 1331 | (with-output-to-temp-buffer "*Directory*" |
| 1332 | (buffer-disable-undo standard-output) |
| 1333 | (princ "Directory ") |
| 1334 | (princ dirname) |
| 1335 | (terpri) |
| 1336 | (if (eq system-type 'vax-vms) |
| 1337 | (vms-read-directory dirname switches standard-output) |
| 1338 | (if (file-directory-p dirname) |
| 1339 | (save-excursion |
| 1340 | (set-buffer "*Directory*") |
| 1341 | (call-process "ls" nil standard-output nil switches |
| 1342 | (setq default-directory |
| 1343 | (file-name-as-directory dirname)))) |
| 1344 | (let ((default-directory (file-name-directory dirname))) |
| 1345 | (if (file-exists-p default-directory) |
| 1346 | (call-process shell-file-name nil standard-output nil |
| 1347 | "-c" (concat "exec ls " |
| 1348 | switches " " |
| 1349 | (file-name-nondirectory dirname))) |
| 1350 | (princ "No such directory: ") |
| 1351 | (princ dirname) |
| 1352 | (terpri)))))))) |
| 1353 | |
| 1354 | (defun save-buffers-kill-emacs (&optional arg) |
| 1355 | "Offer to save each buffer, then kill this Emacs process. |
| 1356 | With prefix arg, silently save all file-visiting buffers, then kill." |
| 1357 | (interactive "P") |
| 1358 | (save-some-buffers arg t) |
| 1359 | (and (or (not (memq t (mapcar (function |
| 1360 | (lambda (buf) (and (buffer-file-name buf) |
| 1361 | (buffer-modified-p buf)))) |
| 1362 | (buffer-list)))) |
| 1363 | (yes-or-no-p "Modified buffers exist; exit anyway? ")) |
| 1364 | (or (not (fboundp 'process-list)) |
| 1365 | ;; process-list is not defined on VMS. |
| 1366 | (let ((processes (process-list)) |
| 1367 | active) |
| 1368 | (while processes |
| 1369 | (and (memq (process-status (car processes)) '(run stop open)) |
| 1370 | (let ((val (process-kill-without-query (car processes)))) |
| 1371 | (process-kill-without-query (car processes) val) |
| 1372 | val) |
| 1373 | (setq active t)) |
| 1374 | (setq processes (cdr processes))) |
| 1375 | (or (not active) |
| 1376 | (yes-or-no-p "Active processes exist; kill them and exit anyway? ")))) |
| 1377 | (kill-emacs))) |
| 1378 | \f |
| 1379 | (define-key ctl-x-map "\C-f" 'find-file) |
| 1380 | (define-key ctl-x-map "\C-q" 'toggle-read-only) |
| 1381 | (define-key ctl-x-map "\C-r" 'find-file-read-only) |
| 1382 | (define-key ctl-x-map "\C-v" 'find-alternate-file) |
| 1383 | (define-key ctl-x-map "\C-s" 'save-buffer) |
| 1384 | (define-key ctl-x-map "s" 'save-some-buffers) |
| 1385 | (define-key ctl-x-map "\C-w" 'write-file) |
| 1386 | (define-key ctl-x-map "i" 'insert-file) |
| 1387 | (define-key esc-map "~" 'not-modified) |
| 1388 | (define-key ctl-x-map "\C-d" 'list-directory) |
| 1389 | (define-key ctl-x-map "\C-c" 'save-buffers-kill-emacs) |
| 1390 | |
| 1391 | (define-key ctl-x-4-map "f" 'find-file-other-window) |
| 1392 | (define-key ctl-x-4-map "r" 'find-file-read-only-other-window) |
| 1393 | (define-key ctl-x-4-map "\C-f" 'find-file-other-window) |
| 1394 | (define-key ctl-x-4-map "b" 'switch-to-buffer-other-window) |
| 1395 | (define-key ctl-x-4-map "o" 'display-buffer) |
| 1396 | |
| 1397 | (define-key ctl-x-5-map "b" 'switch-to-buffer-other-screen) |
| 1398 | (define-key ctl-x-5-map "f" 'find-file-other-screen) |
| 1399 | (define-key ctl-x-5-map "\C-f" 'find-file-other-screen) |
| 1400 | (define-key ctl-x-5-map "r" 'find-file-read-only-other-screen) |
| 1401 | |
| 1402 | ;;; files.el ends here |