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Text File | 1993-02-15 | 54.2 KB | 1,430 lines |
- ;; File input and output commands for Emacs
- ;; Copyright (C) 1985-1993 Free Software Foundation, Inc.
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to
- ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- (defconst delete-auto-save-files t
- "*Non-nil means delete a buffer's auto-save file
- when the buffer is saved for real.")
-
- ;;; Turn off backup files on VMS since it has version numbers.
- (defconst make-backup-files (not (eq system-type 'vax-vms))
- "*Create a backup of each file when it is saved for the first time.
- This can be done by renaming the file or by copying.
-
- Renaming means that Emacs renames the existing file so that it is a
- backup file, then writes the buffer into a new file. Any other names
- that the old file had will now refer to the backup file.
- The new file is owned by you and its group is defaulted.
-
- Copying means that Emacs copies the existing file into the backup file,
- then writes the buffer on top of the existing file. Any other names
- that the old file had will now refer to the new (edited) file.
- The file's owner and group are unchanged.
-
- The choice of renaming or copying is controlled by the variables
- backup-by-copying, backup-by-copying-when-linked and
- backup-by-copying-when-mismatch.")
-
- (defconst backup-by-copying nil
- "*Non-nil means always use copying to create backup files.
- See documentation of variable make-backup-files.")
-
- (defconst backup-by-copying-when-linked nil
- "*Non-nil means use copying to create backups for files with multiple names.
- This causes the alternate names to refer to the latest version as edited.
- This variable is relevant only if backup-by-copying is nil.")
-
- (defconst backup-by-copying-when-mismatch nil
- "*Non-nil means create backups by copying if this preserves owner or group.
- Renaming may still be used (subject to control of other variables)
- when it would not result in changing the owner or group of the file;
- that is, for files which are owned by you and whose group matches
- the default for a new file created there by you.
- This variable is relevant only if backup-by-copying is nil.")
-
- (defconst buffer-offer-save nil
- "*Non-nil in a buffer means offer to save the buffer on exit
- even if the buffer is not visiting a file. Automatically local in
- all buffers.")
- (make-variable-buffer-local 'buffer-offer-save)
-
- (defconst file-precious-flag nil
- "*Non-nil means protect against I/O errors while saving files.
- Some modes set this non-nil in particular buffers.")
-
- (defvar version-control nil
- "*Control use of version numbers for backup files.
- t means make numeric backup versions unconditionally.
- nil means make them for files that have some already.
- never means do not make them.")
-
- (defvar dired-kept-versions 2
- "*When cleaning directory, number of versions to keep.")
-
- (defvar trim-versions-without-asking nil
- "*If true, deletes excess backup versions silently.
- Otherwise asks confirmation.")
-
- (defvar kept-old-versions 2
- "*Number of oldest versions to keep when a new numbered backup is made.")
-
- (defvar kept-new-versions 2
- "*Number of newest versions to keep when a new numbered backup is made.
- Includes the new backup. Must be > 0")
-
- (defconst require-final-newline nil
- "*Value of t says silently ensure a file ends in a newline when it is saved.
- Non-nil but not t says ask user whether to add a newline when there isn't one.
- nil means don't add newlines.")
-
- (defconst auto-save-default t
- "*Non-nil says by default do auto-saving of every file-visiting buffer.")
-
- (defconst auto-save-visited-file-name nil
- "*Non-nil says auto-save a buffer in the file it is visiting, when practical.
- Normally auto-save files are written under other names.")
-
- (defconst save-abbrevs nil
- "*Non-nil means save word abbrevs too when files are saved.
- Loading an abbrev file sets this to t.")
-
- (defconst find-file-run-dired t
- "*Non-nil says run dired if find-file is given the name of a directory.")
-
- (put 'find-file-not-found-hooks 'permanent-local t)
- (defvar find-file-not-found-hooks nil
- "List of functions to be called for find-file on nonexistent file.
- These functions are called as soon as the error is detected.
- buffer-file-name is already set up.
- The functions are called in the order given,
- until one of them returns non-nil.")
-
- (put 'find-file-hooks 'permanent-local t)
- (defvar find-file-hooks nil
- "List of functions to be called after a buffer is loaded from a file.
- The buffer's local variables (if any) will have been processed before the
- functions are called.")
-
- (put 'write-file-hooks 'permanent-local t)
- (defvar write-file-hooks nil
- "List of functions to be called before writing out a buffer to a file.
- If one of them returns non-nil, the file is considered already written
- and the rest are not called.
- These hooks are considered to pertain to the visited file.
- So this list is cleared if you change the visited file name.
- See also `write-contents-hooks'.")
-
- (defvar write-contents-hooks nil
- "List of functions to be called before writing out a buffer to a file.
- If one of them returns non-nil, the file is considered already written
- and the rest are not called.
- These hooks are considered to pertain to the buffer's contents,
- not to the particular visited file; thus, `set-visited-file-name' does
- not clear this variable, but changing the major mode does clear it.
- See also `write-file-hooks'.")
-
- (put 'write-file-data-hooks 'permanent-local t)
- (defvar write-file-data-hooks nil
- "List of functions to be called to put the bytes on disk.
- These functions receive the name of the file to write to as argument.
- The default behavior is to call
- (write-region (point-min) (point-max) filename nil t)
- If one of them returns non-nil, the file is considered already written
- and the rest are not called.
- These hooks are considered to pertain to the visited file.
- So this list is cleared if you change the visited file name.
- See also `write-file-hooks'.")
-
- (put 'after-write-file-hooks 'permanent-local t)
- (defvar after-write-file-hooks nil
- "List of functions to be called after writing out a buffer to a file.
- These hooks are considered to pertain to the visited file.
- So this list is cleared if you change the visited file name.")
-
- (defconst enable-local-variables t
- "*Control use of local-variables lists in files you visit.
- The value can be t, nil or something else.
- A value of t means local-variables lists are obeyed;
- nil means they are ignored; anything else means query.
-
- The command \\[normal-mode] always obeys local-variables lists
- and ignores this variable.")
-
- ;; Avoid losing in versions where CLASH_DETECTION is disabled.
- (or (fboundp 'lock-buffer)
- (fset 'lock-buffer 'ignore))
- (or (fboundp 'unlock-buffer)
- (fset 'unlock-buffer 'ignore))
-
- (defun frob-cdlist (dir)
- (let ((l cdlist)
- cdpathed-dir)
- (while (and l (not (file-directory-p
- (setq cdpathed-dir (concat (car l) "/" dir)))))
- (setq l (cdr l)))
- (and l cdpathed-dir)))
-
- (defun pwd ()
- "Show the current default directory."
- (interactive nil)
- (message "%s" default-directory))
-
- (defun cd (dir)
- "Make DIR become the current buffer's default directory."
- (interactive "DChange default directory: ")
- (setq dir (expand-file-name dir))
- (if (not (eq system-type 'vax-vms))
- (setq dir (file-name-as-directory dir)))
- (if (not (file-directory-p dir))
- (error "%s is not a directory" dir)
- (if (file-executable-p dir)
- (setq default-directory dir)
- (error "Cannot cd to %s: Permission denied" dir)))
- (pwd))
-
- (defun load-file (file)
- "Load the file FILE of Lisp code."
- (interactive "fLoad file: ")
- (load (expand-file-name file) nil nil t))
-
- (defun load-library (library)
- "Load the library named LIBRARY.
- This is an interface to the function `load'."
- (interactive "sLoad library: ")
- (load library))
-
- (defun switch-to-other-buffer (arg)
- "Switch to the previous buffer. With a numeric arg, n, switch to the nth
- most recent buffer. With an arg of 0, buries the current buffer at the
- bottom of the buffer stack."
- (interactive "p")
- (if (eq arg 0)
- (bury-buffer (current-buffer)))
- (switch-to-buffer
- (if (<= arg 1) (other-buffer (current-buffer))
- (nth (1+ arg) (buffer-list)))))
-
- (defun switch-to-buffer-other-window (buffer)
- "Select buffer BUFFER in another window."
- (interactive "BSwitch to buffer in other window: ")
- (let ((pop-up-windows t))
- (pop-to-buffer buffer t)))
-
- (defun find-file (filename)
- "Edit file FILENAME.
- Switch to a buffer visiting file FILENAME,
- creating one if none already exists."
- (interactive "FFind file: ")
- (switch-to-buffer (find-file-noselect filename)))
-
- (defun find-file-other-window (filename)
- "Edit file FILENAME, in another window.
- May create a new window, or reuse an existing one;
- see the function display-buffer."
- (interactive "FFind file in other window: ")
- (switch-to-buffer-other-window (find-file-noselect filename)))
-
- (defun find-file-read-only (filename)
- "Edit file FILENAME but don't allow changes.
- Like \\[find-file] but marks buffer as read-only.
- Use \\[toggle-read-only] to permit editing."
- (interactive "fFind file read-only: ")
- (find-file filename)
- (setq buffer-read-only t))
-
- (defun find-file-read-only-other-window (filename)
- "Edit file FILENAME in another window but don't allow changes.
- Like \\[find-file-other-window] but marks buffer as read-only.
- Use \\[toggle-read-only] to permit editing."
- (interactive "fFind file read-only other window: ")
- (find-file filename)
- (setq buffer-read-only t))
-
- (defun find-alternate-file (filename)
- "Find file FILENAME, select its buffer, kill previous buffer.
- If the current buffer now contains an empty file that you just visited
- \(presumably by mistake), use this command to visit the file you really want."
- (interactive
- (let ((file buffer-file-name)
- (file-name nil)
- (file-dir nil))
- (and file
- (setq file-name (file-name-nondirectory file)
- file-dir (file-name-directory file)))
- (list (read-file-name
- "Find alternate file: " file-dir nil nil file-name))))
- (and (buffer-modified-p)
- ;; (not buffer-read-only)
- (not (yes-or-no-p (format "Buffer %s is modified; kill anyway? "
- (buffer-name))))
- (error "Aborted"))
- (let ((obuf (current-buffer))
- (ofile buffer-file-name)
- (oname (buffer-name)))
- (rename-buffer " **lose**")
- (setq buffer-file-name nil)
- (unwind-protect
- (progn
- (unlock-buffer)
- (find-file filename))
- (cond ((eq obuf (current-buffer))
- (setq buffer-file-name ofile)
- (lock-buffer)
- (rename-buffer oname))))
- (or (eq (current-buffer) obuf)
- (kill-buffer obuf))))
-
- (defun create-file-buffer (filename)
- "Create a suitably named buffer for visiting FILENAME, and return it.
- FILENAME (sans directory) is used unchanged if that name is free;
- otherwise a string <2> or <3> or ... is appended to get an unused name."
- (let ((lastname (file-name-nondirectory filename)))
- (if (string= lastname "")
- (setq lastname filename))
- (generate-new-buffer lastname)))
-
-
- (defun compute-buffer-file-truename ()
- "Recomputes this buffer's value of `buffer-file-truename'
- based on the current value of `buffer-file-name'."
- (cond ((null buffer-file-name)
- (setq buffer-file-truename nil))
- ((setq buffer-file-truename (truename buffer-file-name))
- ;; it exists, we're done.
- nil)
- (t
- ;; the file doesn't exist, but maybe the directory does.
- (let* ((dir (file-name-directory buffer-file-name))
- (truedir (truename dir)))
- (if truedir (setq dir truedir))
- (setq buffer-file-truename
- (expand-file-name (file-name-nondirectory buffer-file-name)
- dir)))))
- (if (and find-file-use-truenames buffer-file-truename)
- (setq buffer-file-name (abbreviate-file-name buffer-file-truename)
- default-directory (file-name-directory buffer-file-name)))
- buffer-file-truename)
-
-
- (defun find-file-noselect (filename &optional nowarn)
- "Read file FILENAME into a buffer and return the buffer.
- If a buffer exists visiting FILENAME, return that one, but
- verify that the file has not changed since visited or saved.
- The buffer is not selected, just returned to the caller."
- (setq filename (abbreviate-file-name (expand-file-name filename)))
- (if (file-directory-p filename)
- (if find-file-run-dired
- (dired-noselect filename)
- (error "%s is a directory." filename))
- (let ((buf (get-file-buffer filename))
- error)
- (if (and buf (not nowarn)
- (or find-file-compare-truenames find-file-use-truenames))
- (save-excursion
- (set-buffer buf)
- (if (not (equal buffer-file-name filename))
- (message "%s and %s are the same file (%s)"
- filename buffer-file-name
- buffer-file-truename))))
- (if buf
- (or nowarn
- (verify-visited-file-modtime buf)
- (cond ((not (file-exists-p filename))
- (error "File %s no longer exists!" filename))
- ((yes-or-no-p
- (format
- (if (buffer-modified-p buf)
- "File %s changed on disk. Discard your edits? "
- "File %s changed on disk. Read the new version? ")
- (file-name-nondirectory filename)))
- (save-excursion
- (set-buffer buf)
- (revert-buffer t t)))))
- (save-excursion
- (setq buf (create-file-buffer filename))
- (set-buffer buf)
- (erase-buffer)
- (condition-case ()
- (insert-file-contents filename t)
- (file-error
- (setq error t)
- ;; Run find-file-not-found-hooks until one returns non-nil.
- (let ((hooks find-file-not-found-hooks))
- (while (and hooks
- (not (funcall (car hooks))))
- (setq hooks (cdr hooks))))))
- ;; Set buffer's default directory to that of the file.
- (setq default-directory (file-name-directory buffer-file-name))
- (after-find-file error (not nowarn))))
- buf)))
-
- (defun after-find-file (&optional error warn)
- "Called after finding a file and by the default revert function.
- Sets buffer mode, parses local variables.
- Optional args ERROR and WARN: ERROR non-nil means there was an
- error in reading the file. WARN non-nil means warn if there
- exists an auto-save file more recent than the visited file.
- Finishes by calling the functions in find-file-hooks."
- (setq buffer-read-only (not (file-writable-p buffer-file-name)))
- (if noninteractive
- nil
- (let* (not-serious
- (msg
- (cond ((and error (file-attributes buffer-file-name))
- (setq buffer-read-only t)
- "File exists, but is read-protected.")
- ((not buffer-read-only)
- (if (and warn
- (file-newer-than-file-p (make-auto-save-file-name)
- buffer-file-name))
- "Auto save file is newer; consider M-x recover-file"
- (setq not-serious t)
- (if error "(New file)" nil)))
- ((not error)
- (setq not-serious t)
- "File is write protected")
- ((file-attributes (directory-file-name default-directory))
- "File not found and directory write-protected")
- (t
- ;; If the directory the buffer is in doesn't exist,
- ;; offer to create it. It's better to do this now
- ;; than when we save the buffer, because we want
- ;; autosaving to work.
- (setq buffer-read-only nil)
- (or (file-exists-p (file-name-directory buffer-file-name))
- (if (yes-or-no-p
- (format
- "The directory containing %s does not exist. Create? "
- (abbreviate-file-name buffer-file-name)))
- (make-directory-path
- (file-name-directory buffer-file-name))))
- nil))))
- (if msg
- (progn
- (message msg)
- (or not-serious (sit-for 1 t)))))
- (if auto-save-default
- (auto-save-mode t)))
- (normal-mode t)
- (mapcar 'funcall find-file-hooks))
-
- (defun normal-mode (&optional find-file)
- "Choose the major mode for this buffer automatically.
- Also sets up any specified local variables of the file.
- Uses the visited file name, the -*- line, and the local variables spec.
-
- This function is called automatically from `find-file'. In that case,
- we may set up specified local variables depending on the value of
- `enable-local-variables': if it is t, we do; if it is nil, we don't;
- otherwise, we query. `enable-local-variables' is ignored if you
- run `normal-mode' explicitly."
- (interactive)
- (or find-file (funcall (or default-major-mode 'fundamental-mode)))
- (let (err)
- (condition-case err
- (set-auto-mode)
- (error (message "File mode specification error: %s"
- (prin1-to-string err))
- (setq err t)))
- (or err
- (condition-case err
- (hack-local-variables (not find-file))
- (error (message "File local-variables error: %s"
- (prin1-to-string err)))))))
-
- ;(defvar auto-mode-alist ...) now in loaddefs.el
- (defun set-auto-mode ()
- "Select major mode appropriate for current buffer.
- May base decision on visited file name (see variable `auto-mode-alist') or on
- buffer contents (the -*- line), but does not look for the \"mode:\" local
- variable spec in the last page. For that, use `hack-local-variables'."
-
- (save-excursion
- ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
- ;; Do this by calling the hack-local-variables helper to avoid redundancy.
- (or (let ((enable-local-variables nil))
- (hack-local-variables-prop-line nil))
- ;; It's not in the -*- line, so check the auto-mode-alist, unless
- ;; this buffer isn't associated with a file.
- (null buffer-file-name)
- (let (mode
- (alist auto-mode-alist)
- (name (file-name-sans-versions buffer-file-name))
- (case-fold-search (eq system-type 'vax-vms)))
- ;; Find first matching alist entry.
- (while (and (not mode) alist)
- (if (string-match (car (car alist)) name)
- (setq mode (cdr (car alist))))
- (setq alist (cdr alist)))
- (if mode (funcall mode))))))
-
-
- (defun hack-local-variables (&optional force)
- "Parse, and bind or evaluate as appropriate, any local variables
- for current buffer."
- (hack-local-variables-prop-line force) ;; Look for variables in the -*- line.
- (hack-local-variables-last-page force) ;; Look for "Local variables:" block in last page.
- )
-
- ;;; Local variables may be specified in the last page of the file (within 3k
- ;;; from the end of the file and after the last ^L) in the form
- ;;;
- ;;; Local variables:
- ;;; variable-name: variable-value
- ;;; end:
- ;;;
- ;;; The lines may begin with a common prefix, like ";;; " in the above
- ;;; example. They may also have a common suffix (" */" for example). In
- ;;; this form, the local variable "mode" can be used to change the major
- ;;; mode, and the local variable "eval" can be used to evaluate an arbitrary
- ;;; form.
- ;;;
- ;;; Local variables may also be specified in the first line of the file.
- ;;; Embedded in this line are a pair of "-*-" sequences. What lies between
- ;;; them are variable-name/variable-value pairs, like:
- ;;;
- ;;; -*- mode: emacs-lisp -*-
- ;;; or -*- mode: postscript; version-control: never -*-
- ;;; or -*- tags-file-name: "/foo/bar/TAGS" -*-
- ;;;
- ;;; The local variable "eval" is not used with this form. For hysterical
- ;;; reasons, the syntax "-*- modename -*-" is allowed as well.
- ;;;
-
- (defun hack-local-variables-last-page (&optional force)
- ;; Set local variables set in the "Local Variables:" block of the last page.
- (save-excursion
- (goto-char (point-max))
- (search-backward "\n\^L" (max (- (point-max) 3000) (point-min)) 'move)
- (if (let ((case-fold-search t))
- (and (search-forward "Local Variables:" nil t)
- (or force (eq enable-local-variables t)
- (and enable-local-variables
- (save-window-excursion
- (switch-to-buffer (current-buffer))
- (y-or-n-p (format "Set local variables as specified at end of %s? "
- (file-name-nondirectory buffer-file-name))))))))
- (let ((continue t)
- prefix prefixlen suffix beg)
- ;; The prefix is what comes before "local variables:" in its line.
- ;; The suffix is what comes after "local variables:" in its line.
- (skip-chars-forward " \t")
- (or (eolp)
- (setq suffix (buffer-substring (point)
- (progn (end-of-line) (point)))))
- (goto-char (match-beginning 0))
- (or (bolp)
- (setq prefix
- (buffer-substring (point)
- (progn (beginning-of-line) (point)))))
- (if prefix (setq prefixlen (length prefix)
- prefix (regexp-quote prefix)))
- (if suffix (setq suffix (regexp-quote suffix)))
- (while continue
- ;; Look at next local variable spec.
- (if selective-display (re-search-forward "[\n\C-m]")
- (forward-line 1))
- ;; Skip the prefix, if any.
- (if prefix
- (if (looking-at prefix)
- (forward-char prefixlen)
- (error "Local variables entry is missing the prefix")))
- ;; Find the variable name; strip whitespace.
- (skip-chars-forward " \t")
- (setq beg (point))
- (skip-chars-forward "^:\n")
- (if (eolp) (error "Missing colon in local variables entry"))
- (skip-chars-backward " \t")
- (let* ((str (buffer-substring beg (point)))
- (var (read str))
- val)
- ;; Setting variable named "end" means end of list.
- (if (string-equal (downcase str) "end")
- (setq continue nil)
- ;; Otherwise read the variable value.
- (skip-chars-forward "^:")
- (forward-char 1)
- (setq val (read (current-buffer)))
- (skip-chars-backward "\n")
- (skip-chars-forward " \t")
- (or (if suffix (looking-at suffix) (eolp))
- (error "Local variables entry is terminated incorrectly"))
- ;; Set the variable. "Variables" mode and eval are funny.
- (cond ((eq var 'mode)
- (funcall (intern (concat (downcase (symbol-name val))
- "-mode"))))
- ((eq var 'eval)
- (if (string= (user-login-name) "root")
- (message "Ignoring `eval:' in file's local variables")
- (save-excursion (eval val))))
- (t (make-local-variable var)
- (set var val))))))))))
-
-
- (defun hack-local-variables-prop-line (&optional force)
- ;; Set local variables specified in the -*- line.
- ;; Returns t if mode was set.
- (save-excursion
- (goto-char (point-min))
- (skip-chars-forward " \t\n\r")
- (let ((result '())
- (end (save-excursion (end-of-line) (point)))
- mode-p)
- ;; Parse the -*- line into the `result' alist.
- (cond ((not (search-forward "-*-" end t))
- ;; doesn't have one.
- nil)
- ((looking-at "[ \t]*\\([^ \t\n\r:;]\\)+\\([ \t]*-\\*-\\)")
- ;; Antiquated form: "-*- ModeName -*-".
- (setq result
- (list (cons 'mode
- (intern (buffer-substring
- (match-beginning 1)
- ;; (match-end 1) doesn't do what I expect
- (match-beginning 2)))))))
- (t
- ;; Usual form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
- ;; (last ";" is optional).
- (save-excursion
- (if (search-forward "-*-" end t)
- (setq end (- (point) 3))
- (error "-*- not terminated before end-of-line")))
- (while (< (point) end)
- (or (looking-at "[ \t]*\\([^ \t\n:]+\\)[ \t]*:[ \t]*")
- (error "malformed -*- line"))
- (goto-char (match-end 0))
- (let ((key (intern (downcase (buffer-substring
- (match-beginning 1)
- (match-end 1)))))
- (val (save-restriction
- (narrow-to-region (point) end)
- (read (current-buffer)))))
- (setq result (cons (cons key val) result))
- (skip-chars-forward " \t;")))
- (setq result (nreverse result))))
-
- ;; Mode is magic.
- (let (mode)
- (while (setq mode (assq 'mode result))
- (setq mode-p t result (delq mode result))
- (funcall (intern (concat (downcase (symbol-name (cdr mode)))
- "-mode")))))
-
- (if (and result
- (or force (eq enable-local-variables t)
- (and enable-local-variables
- (save-window-excursion
- (switch-to-buffer (current-buffer))
- (y-or-n-p (format "Set local variables as specified in -*- line of %s? "
- (file-name-nondirectory buffer-file-name)))))))
- (while result
- (let ((key (car (car result)))
- (val (cdr (car result))))
- ;; 'mode has already been removed from this list.
- (make-local-variable key)
- (set key val))
- (setq result (cdr result))))
- mode-p)))
-
-
- (defun set-visited-file-name (filename)
- "Change name of file visited in current buffer to FILENAME.
- The next time the buffer is saved it will go in the newly specified file.
- nil or empty string as argument means make buffer not be visiting any file.
- Remember to delete the initial contents of the minibuffer
- if you wish to pass an empty string as the argument."
- (interactive "FSet visited file name: ")
- (if filename
- (setq filename
- (if (string-equal filename "")
- nil
- (expand-file-name filename))))
- (or (equal filename buffer-file-name)
- (null filename)
- (progn
- (lock-buffer filename)
- (unlock-buffer)))
- (setq buffer-file-name filename)
- (if filename ; make buffer name reflect filename.
- (let ((new-name (file-name-nondirectory buffer-file-name)))
- (if (string= new-name "")
- (error "Empty file name"))
- (if (eq system-type 'vax-vms)
- (setq new-name (downcase new-name)))
- (setq default-directory (file-name-directory buffer-file-name))
- (let ((new-buffer (get-buffer new-name))
- (current-buffer (current-buffer)))
- (cond ((eq new-buffer current-buffer)
- ;; continue using current buffer name
- )
- ((not (null new-buffer))
- ;; the buffer name that we want to use is taken
- (let* ((buf (create-file-buffer buffer-file-name)))
- (setq new-name (buffer-name buf))
- (kill-buffer buf))
- (rename-buffer new-name))
- (t
- ;; Just rename the buffer to the new name
- (rename-buffer new-name))))))
- (compute-buffer-file-truename) ; insert-file-contents does this too.
- (setq buffer-backed-up nil)
- (clear-visited-file-modtime)
- ;; write-file-hooks is normally used for things like ftp-find-file
- ;; that visit things that are not local files as if they were files.
- ;; Changing to visit an ordinary local file instead should flush the hook.
- (kill-local-variable 'write-file-hooks)
- (kill-local-variable 'write-file-data-hooks)
- (kill-local-variable 'after-write-file-hooks)
- (kill-local-variable 'revert-buffer-function)
- ;; If auto-save was not already on, turn it on if appropriate.
- (if (not buffer-auto-save-file-name)
- (auto-save-mode (and buffer-file-name auto-save-default)))
- (if buffer-file-name
- (set-buffer-modified-p t)))
-
- (defun write-file (filename)
- "Write current buffer into file FILENAME.
- Makes buffer visit that file, and marks it not modified."
- ;; (interactive "FWrite file: ")
- (interactive
- (list (if buffer-file-name
- (read-file-name "Write file: "
- nil nil nil nil)
- (read-file-name "Write file: "
- (cdr (assq 'default-directory
- (buffer-local-variables)))
- nil nil (buffer-name)))))
- (or (null filename) (string-equal filename "")
- (set-visited-file-name filename))
- (set-buffer-modified-p t)
- (save-buffer))
-
- (defun backup-buffer ()
- "Make a backup of the disk file visited by the current buffer, if appropriate.
- This is normally done before saving the buffer the first time.
- If the value is non-nil, it is the result of `file-modes' on the original file;
- this means that the caller, after saving the buffer, should change the modes
- of the new file to agree with the old modes."
- (if (and make-backup-files
- (not buffer-backed-up)
- (file-exists-p buffer-file-name)
- (memq (aref (elt (file-attributes buffer-file-name) 8) 0)
- '(?- ?l))
- ;; user should do this with after-find-file-hooks if desired
- ;; (or (< (length buffer-file-name) 5)
- ;; (not (string-equal "/tmp/" (substring buffer-file-name 0 5))))
- )
- (let ((real-file-name buffer-file-name)
- backup-info backupname targets setmodes last)
- ;; If specified name is a symbolic link, chase it to the target.
- ;; Thus we make the backups in the directory where the real file is.
- (while (let ((tem (file-symlink-p real-file-name)))
- (if (equal real-file-name last)
- ;; this is to prevent us from looping on pathnames
- ;; like "dir1/dir2/../foo", where that is not the
- ;; same as "dir1/foo" because dir2 is a link.
- nil
- (if tem
- (setq last real-file-name
- real-file-name
- (expand-file-name tem
- (file-name-directory
- real-file-name)))
- tem))))
- (setq backup-info (find-backup-file-name real-file-name)
- backupname (car backup-info)
- targets (cdr backup-info))
- ;;; (if (file-directory-p buffer-file-name)
- ;;; (error "Cannot save buffer in directory %s" buffer-file-name))
- (condition-case ()
- (let ((delete-old-versions
- ;; If have old versions to maybe delete,
- ;; ask the user to confirm now, before doing anything.
- ;; But don't actually delete til later.
- (and targets
- (or trim-versions-without-asking
- (y-or-n-p (format "Delete excess backup versions of %s? "
- real-file-name))))))
- ;; Actually write the back up file.
- (condition-case ()
- (if (or file-precious-flag
- ; (file-symlink-p buffer-file-name)
- backup-by-copying
- (and backup-by-copying-when-linked
- (> (file-nlinks real-file-name) 1))
- (and backup-by-copying-when-mismatch
- (let ((attr (file-attributes real-file-name)))
- (or (nth 9 attr)
- (/= (nth 2 attr) (user-uid))))))
- (copy-file real-file-name backupname t t)
- ; rename-file should delete old backup.
- ; (condition-case ()
- ; (delete-file backupname)
- ; (file-error nil))
- (rename-file real-file-name backupname t)
- (setq setmodes (file-modes backupname)))
- (file-error
- ;; If trouble writing the backup, write it in ~.
- (setq backupname (expand-file-name "~/%backup%~"))
- (message "Cannot write backup file; backing up in ~/%%backup%%~")
- (sleep-for 1)
- (copy-file real-file-name backupname t t)))
- (setq buffer-backed-up t)
- ;; Now delete the old versions, if desired.
- (if delete-old-versions
- (while targets
- (condition-case ()
- (delete-file (car targets))
- (file-error nil))
- (setq targets (cdr targets))))
- setmodes)
- (file-error nil)))))
-
- (defun file-name-sans-versions (name)
- "Return FILENAME sans backup versions or strings.
- This is a separate procedure so your site-init or startup file can
- redefine it."
- (substring name 0
- (if (eq system-type 'vax-vms)
- ;; VMS version number is (a) semicolon, optional
- ;; sign, zero or more digits or (b) period, option
- ;; sign, zero or more digits, provided this is the
- ;; second period encountered outside of the
- ;; device/directory part of the file name.
- (or (string-match ";[---+]?[0-9]*\\'" name)
- (if (string-match "\\.[^]>:]*\\(\\.[---+]?[0-9]*\\)\\'"
- name)
- (match-beginning 1))
- (length name))
- (or (string-match "\\.~[0-9]+~\\'" name)
- (string-match "~\\'" name)
- (length name)))))
-
- (defun make-backup-file-name (file)
- "Create the non-numeric backup file name for FILE.
- This is a separate function so you can redefine it for customization."
- (concat file "~"))
-
- (defun backup-file-name-p (file)
- "Return non-nil if FILE is a backup file name (numeric or not).
- This is a separate function so you can redefine it for customization.
- You may need to redefine file-name-sans-versions as well."
- (string-match "~$" file))
-
- ;; I believe there is no need to alter this behavior for VMS;
- ;; since backup files are not made on VMS, it should not get called.
- (defun find-backup-file-name (fn)
- "Find a file name for a backup file, and suggestions for deletions.
- Value is a list whose car is the name for the backup file
- and whose cdr is a list of old versions to consider deleting now."
- (if (eq version-control 'never)
- (list (make-backup-file-name fn))
- (let* ((base-versions (concat (file-name-nondirectory fn) ".~"))
- (bv-length (length base-versions)) ; used by backup-extract-version
- (possibilities (file-name-all-completions
- base-versions
- (file-name-directory fn)))
- (versions (sort (mapcar 'backup-extract-version possibilities)
- '<))
- (high-water-mark (apply 'max (cons 0 versions)))
- (deserve-versions-p
- (or version-control
- (> high-water-mark 0)))
- (number-to-delete (- (length versions)
- kept-old-versions kept-new-versions -1)))
- (if (not deserve-versions-p)
- (list (make-backup-file-name fn))
- (cons (concat fn ".~" (int-to-string (1+ high-water-mark)) "~")
- (if (> number-to-delete 0)
- (mapcar (function (lambda (n)
- (concat fn ".~" (int-to-string n) "~")))
- (let ((v (nthcdr kept-old-versions versions)))
- (rplacd (nthcdr (1- number-to-delete) v) ())
- v))))))))
-
- (defun backup-extract-version (fn)
- ;; bv-length is bound in find-backup-file-name
- (if (and (string-match "[0-9]+~$" fn bv-length)
- (= (match-beginning 0) bv-length))
- (string-to-int (substring fn bv-length -1))
- 0))
-
- (defun file-nlinks (filename)
- "Return number of names file FILENAME has."
- (car (cdr (file-attributes filename))))
-
- (defun file-relative-name-1 (directory)
- (cond ((string= directory "/")
- filename)
- ((string-match (concat "^" (regexp-quote directory))
- filename)
- (substring filename (match-end 0)))
- (t
- (file-relative-name-1
- (file-name-directory (substring directory 0 -1))))))
-
- (defun file-relative-name (filename &optional directory)
- "Convert FILENAME to be relative to DIRECTORY (default: default-directory)."
- (setq filename (expand-file-name filename)
- directory (file-name-as-directory (if directory
- (expand-file-name directory)
- default-directory)))
- (file-relative-name-1 directory))
-
- (defun save-buffer (&optional args)
- "Save current buffer in visited file if modified. Versions described below.
-
- By default, makes the previous version into a backup file
- if previously requested or if this is the first save.
- With 1 or 3 \\[universal-argument]'s, marks this version
- to become a backup when the next save is done.
- With 2 or 3 \\[universal-argument]'s,
- unconditionally makes the previous version into a backup file.
- With argument of 0, never makes the previous version into a backup file.
-
- If a file's name is FOO, the names of its numbered backup versions are
- FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
- Numeric backups (rather than FOO~) will be made if value of
- `version-control' is not the atom `never' and either there are already
- numeric versions of the file being backed up, or `version-control' is
- non-nil.
- We don't want excessive versions piling up, so there are variables
- `kept-old-versions', which tells Emacs how many oldest versions to keep,
- and `kept-new-versions', which tells how many newest versions to keep.
- Defaults are 2 old versions and 2 new.
- `dired-kept-versions' controls dired's clean-directory (.) command.
- If `trim-versions-without-asking' is nil, system will query user
- before trimming versions. Otherwise it does it silently."
- (interactive "p")
- (let ((modp (buffer-modified-p))
- (large (> (buffer-size) 50000))
- (make-backup-files (and make-backup-files (not (eq args 0)))))
- (and modp (memq args '(16 64)) (setq buffer-backed-up nil))
- (if (and modp large) (message "Saving file %s..." (buffer-file-name)))
- (basic-save-buffer)
- (and modp (memq args '(4 64)) (setq buffer-backed-up nil))))
-
- (defun delete-auto-save-file-if-necessary (&optional force)
- "Delete the auto-save filename for the current buffer (if it has one)
- if variable `delete-auto-save-files' is non-nil.
- Normally delete only if the file was written by this Emacs
- since the last real save, but optional arg FORCE non-nil means delete anyway."
- (and buffer-auto-save-file-name delete-auto-save-files
- (not (string= buffer-file-name buffer-auto-save-file-name))
- (or force (recent-auto-save-p))
- (progn
- (condition-case ()
- (delete-file buffer-auto-save-file-name)
- (file-error nil))
- (set-buffer-auto-saved))))
-
- (defun basic-write-file-data (realname)
- ;; call the hooks until the bytes are put
- ;; call write-region as a last resort
- (let ((region-written nil)
- (hooks write-file-data-hooks))
- (while (and hooks (not region-written))
- (setq region-written (funcall (car hooks) realname)
- hooks (cdr hooks)))
- (if (not region-written)
- (write-region (point-min) (point-max) realname nil t))))
-
- (defun basic-save-buffer ()
- "Save the current buffer in its visited file, if it has been modified."
- (interactive)
- (if (buffer-modified-p)
- (let ((recent-save (recent-auto-save-p))
- setmodes tempsetmodes)
- ;; On VMS, rename file and buffer to get rid of version number.
- (if (and (eq system-type 'vax-vms)
- (not (string= buffer-file-name
- (file-name-sans-versions buffer-file-name))))
- (let (buffer-new-name)
- ;; Strip VMS version number before save.
- (setq buffer-file-name
- (file-name-sans-versions buffer-file-name))
- ;; Construct a (unique) buffer name to correspond.
- (let ((buf (create-file-buffer (downcase buffer-file-name))))
- (setq buffer-new-name (buffer-name buf))
- (kill-buffer buf))
- (rename-buffer buffer-new-name)))
- ;; If buffer has no file name, ask user for one.
- (or buffer-file-name
- (progn
- (setq buffer-file-name
- (expand-file-name (read-file-name "File to save in: ") nil)
- default-directory (file-name-directory buffer-file-name))
- (auto-save-mode auto-save-default)))
- (or (verify-visited-file-modtime (current-buffer))
- (not (file-exists-p buffer-file-name))
- (yes-or-no-p
- (format "%s has changed since visited or saved. Save anyway? "
- (file-name-nondirectory buffer-file-name)))
- (error "Save not confirmed"))
- (save-restriction
- (widen)
- (and (> (point-max) 1)
- (/= (char-after (1- (point-max))) ?\n)
- (or (eq require-final-newline t)
- (and require-final-newline
- (y-or-n-p
- (format "Buffer %s does not end in newline. Add one? "
- (buffer-name)))))
- (save-excursion
- (goto-char (point-max))
- (insert ?\n)))
- (let ((done nil))
- ;;
- ;; Run the write-file-hooks until one returns non-null.
- ;; Bind after-write-file-hooks to nil while running the
- ;; write-file-hooks so that if this function is called
- ;; recursively (from inside a write-file-hook) the after-
- ;; hooks will only get run once (from the outermost call.)
- ;;
- (let ((hooks (append write-contents-hooks write-file-hooks))
- (after-write-file-hooks nil)
- (write-contents-hooks nil)
- (write-file-hooks nil))
- (while (and hooks
- (not (setq done (funcall (car hooks)))))
- (setq hooks (cdr hooks))))
- ;;
- ;; If a hook returned t, file is already "written".
- (cond ((not done)
- (if (not (file-writable-p buffer-file-name))
- (let ((dir (file-name-directory buffer-file-name)))
- (if (not (file-directory-p dir))
- (error "%s is not a directory" dir)
- (if (not (file-exists-p buffer-file-name))
- (error "Directory %s write-protected" dir)
- (if (yes-or-no-p
- (format "File %s is write-protected; try to save anyway? "
- (file-name-nondirectory
- buffer-file-name)))
- (setq tempsetmodes t)
- (error
- "Attempt to save to a file which you aren't allowed to write"))))))
- (or buffer-backed-up
- (setq setmodes (backup-buffer)))
- (if file-precious-flag
- ;; If file is precious, rename it away before
- ;; overwriting it.
- (let ((rename t)
- realname tempname temp)
- ;; Chase symlinks; rename the ultimate actual file.
- (setq realname buffer-file-name)
- (while (setq temp (file-symlink-p realname))
- (setq realname temp))
- (setq tempname (concat realname "#"))
- (condition-case ()
- (progn (rename-file realname tempname t)
- (setq setmodes (file-modes tempname)))
- (file-error (setq rename nil tempname nil)))
- (if (file-directory-p realname)
- (error "%s is a directory" realname))
- (unwind-protect
- (progn (clear-visited-file-modtime)
- (basic-write-file-data realname)
- (setq rename nil))
- ;; If rename is still t, writing failed.
- ;; So rename the old file back to original name,
- (if rename
- (progn
- (rename-file tempname realname t)
- (clear-visited-file-modtime))
- ;; Otherwise we don't need the original file,
- ;; so flush it, if we still have it.
- ;; If rename failed due to name length restriction
- ;; then TEMPNAME is now nil.
- (if tempname
- (condition-case ()
- (delete-file tempname)
- (error nil))))))
- ;; If file not writable, see if we can make it writable
- ;; temporarily while we write it.
- ;; But no need to do so if we have just backed it up
- ;; (setmodes is set) because that says we're superseding.
- (cond ((and tempsetmodes (not setmodes))
- ;; Change the mode back, after writing.
- (setq setmodes (file-modes buffer-file-name))
- (set-file-modes buffer-file-name 511)))
- (basic-write-file-data buffer-file-name)))))
- (if setmodes
- (condition-case ()
- (set-file-modes buffer-file-name setmodes)
- (error nil))))
- ;; If the auto-save file was recent before this command,
- ;; delete it now.
- (delete-auto-save-file-if-necessary recent-save)
- ;; Now we're done with everything; run the after-write-file-hooks.
- ;; ## warning: FSF calls this variable `after-save-hooks'.
- (run-hooks 'after-write-file-hooks))
- (message "(No changes need to be saved)")))
-
- (defun save-some-buffers (&optional arg exiting)
- "Save some modified file-visiting buffers. Asks user about each one.
- Optional argument (the prefix) non-nil means save all with no questions.
- Optional second argument EXITING means ask about certain non-file buffers
- as well as about file buffers."
- (interactive "P")
- (let (considered (list (buffer-list)))
- (while list
- (let ((buffer (car list)))
- (and (buffer-modified-p buffer)
- (not (cdr (assoc 'save-buffers-skip
- (buffer-local-variables buffer))))
- (save-excursion
- (set-buffer buffer)
- (and
- (or buffer-file-name
- (and exiting buffer-offer-save (> (buffer-size) 0)))
- (setq considered t)
- (or arg
- (y-or-n-p (if buffer-file-name
- (format "Save file %s? "
- buffer-file-name)
- (format "Save buffer %s? " (buffer-name)))))
- (condition-case ()
- (save-buffer)
- (error nil))))))
- (setq list (cdr list)))
- (and save-abbrevs abbrevs-changed
- (progn
- (setq considered t)
- (if (or arg
- (y-or-n-p (format "Save abbrevs in %s? " abbrev-file-name)))
- (write-abbrev-file nil))
- ;; Don't keep bothering user if he says no.
- (setq abbrevs-changed nil)))
- (if considered
- (message "")
- (message "(No files need saving)"))))
-
- (defun not-modified (&optional arg)
- "Mark current buffer as unmodified, not needing to be saved.
- With prefix arg, mark buffer as modified, so \\[save-buffer] will save."
- (interactive "P")
- (message (if arg "Modification-flag set"
- "Modification-flag cleared"))
- (set-buffer-modified-p arg))
-
- (defun toggle-read-only (&optional arg)
- "Change whether this buffer is visiting its file read-only.
- With arg, set read-only iff arg is positive."
- (interactive "P")
- (setq buffer-read-only
- (if (null arg)
- (not buffer-read-only)
- (> (prefix-numeric-value arg) 0)))
- ;; Force mode-line redisplay
- (set-buffer-modified-p (buffer-modified-p)))
-
- (defun insert-file (filename)
- "Insert contents of file FILENAME into buffer after point.
- Set mark after the inserted text.
-
- This function is meant for the user to run interactively.
- Don't call it from programs! Use `insert-file-contents' instead.
- \(Its calling sequence is different; see its documentation)."
- (interactive "fInsert file: ")
- (let ((tem (insert-file-contents filename)))
- (push-mark (+ (point) (car (cdr tem))))))
-
- (defun append-to-file (start end filename)
- "Append the contents of the region to the end of file FILENAME.
- When called from a function, expects three arguments,
- START, END and FILENAME. START and END are buffer positions
- saying what text to write."
- (interactive "r\nFAppend to file: ")
- (write-region start end filename t))
-
- (defun file-newest-backup (filename)
- "Return most recent backup file for FILENAME or nil if no backups exist."
- (let* ((filename (expand-file-name filename))
- (file (file-name-nondirectory filename))
- (dir (file-name-directory filename))
- (comp (file-name-all-completions file dir))
- newest)
- (while comp
- (setq file (concat dir (car comp))
- comp (cdr comp))
- (if (and (backup-file-name-p file)
- (or (null newest) (file-newer-than-file-p file newest)))
- (setq newest file)))
- newest))
-
- (defun rename-uniquely ()
- "Rename current buffer to a similar name not already taken.
- This function is useful for creating multiple shell process buffers
- or multiple mail buffers, etc."
- (interactive)
- (let* ((new-buf (generate-new-buffer (buffer-name)))
- (name (buffer-name new-buf)))
- (kill-buffer new-buf)
- (rename-buffer name)
- (set-buffer-modified-p (buffer-modified-p)))) ; force mode line update
-
- (defun make-directory-path (path)
- "Create all the directories along path that don't exist yet."
- (interactive "Fdirectory path to create: ")
- (let ((path (directory-file-name (expand-file-name path)))
- create-list)
- (while (not (file-exists-p path))
- (setq create-list (cons path create-list)
- path (directory-file-name (file-name-directory path))))
- (while create-list
- (make-directory (car create-list))
- (setq create-list (cdr create-list)))))
-
-
- (put 'revert-buffer-function 'permanent-local t)
- (defvar revert-buffer-function nil
- "Function to use to revert this buffer, or nil to do the default.")
-
- (put 'revert-buffer-insert-file-contents-function 'permanent-local t)
- (defvar revert-buffer-insert-file-contents-function nil
- "Function to use to insert contents when reverting this buffer.
- Gets two args, first the nominal file name to use,
- and second, t if reading the auto-save file.")
-
- (defun revert-buffer (&optional check-auto noconfirm)
- "Replace the buffer text with the text of the visited file on disk.
- This undoes all changes since the file was visited or saved.
- With a prefix argument, offer to revert from latest auto-save file, if
- that is more recent than the visited file.
- When called from lisp, this is the first argument, CHECK-AUTO; it is optional.
- Optional second argument NOCONFIRM means don't ask for confirmation at all.
-
- If the value of `revert-buffer-function' is non-nil, it is called to
- do the work."
- (interactive "P")
- (if revert-buffer-function
- (funcall revert-buffer-function (not check-auto) noconfirm)
- (let* ((opoint (point))
- (auto-save-p (and check-auto (recent-auto-save-p)
- buffer-auto-save-file-name
- (file-readable-p buffer-auto-save-file-name)
- (y-or-n-p
- "Buffer has been auto-saved recently. Revert from auto-save file? ")))
- (file-name (if auto-save-p
- buffer-auto-save-file-name
- buffer-file-name)))
- (cond ((null file-name)
- (error "Buffer does not seem to be associated with any file"))
- ((or noconfirm
- (yes-or-no-p (format "Revert buffer from file %s? "
- file-name)))
- ;; If file was backed up but has changed since,
- ;; we shd make another backup.
- (and (not auto-save-p)
- (not (verify-visited-file-modtime (current-buffer)))
- (setq buffer-backed-up nil))
- ;; Get rid of all undo records for this buffer.
- (or (eq buffer-undo-list t)
- (setq buffer-undo-list nil))
- (let ((buffer-read-only nil)
- ;; Don't make undo records for the reversion.
- (buffer-undo-list t))
- (if revert-buffer-insert-file-contents-function
- (funcall revert-buffer-insert-file-contents-function
- file-name auto-save-p)
- (if (not (file-exists-p file-name))
- (error "File %s no longer exists!" file-name))
- ;; Bind buffer-file-name to nil
- ;; so that we don't try to lock the file.
- (let ((buffer-file-name nil))
- (or auto-save-p
- (unlock-buffer))
- (erase-buffer))
- (insert-file-contents file-name (not auto-save-p))))
- (goto-char (min opoint (point-max)))
- (after-find-file nil)
- t)))))
-
- (defun recover-file (file)
- "Visit file FILE, but get contents from its last auto-save file."
- (interactive
- (let ((prompt-file buffer-file-name)
- (file-name nil)
- (file-dir nil))
- (and prompt-file
- (setq file-name (file-name-nondirectory prompt-file)
- file-dir (file-name-directory prompt-file)))
- (list (read-file-name "Recover file: "
- file-dir nil nil file-name))))
- (setq file (expand-file-name file))
- (if (auto-save-file-name-p file) (error "%s is an auto-save file" file))
- (let ((file-name (let ((buffer-file-name file))
- (make-auto-save-file-name))))
- (cond ((not (file-newer-than-file-p file-name file))
- (error "Auto-save file %s not current" file-name))
- ((save-window-excursion
- (if (not (eq system-type 'vax-vms))
- (with-output-to-temp-buffer "*Directory*"
- (buffer-disable-undo standard-output)
- (call-process "ls" nil standard-output nil
- (if (file-symlink-p file) "-lL" "-l")
- file file-name)))
- (yes-or-no-p (format "Recover auto save file %s? " file-name)))
- (switch-to-buffer (find-file-noselect file t))
- (let ((buffer-read-only nil))
- (erase-buffer)
- (insert-file-contents file-name nil))
- (after-find-file nil))
- (t (error "Recover-file cancelled.")))))
-
- (defun kill-some-buffers ()
- "For each buffer, ask whether to kill it."
- (interactive)
- (let ((list (buffer-list)))
- (while list
- (let* ((buffer (car list))
- (name (buffer-name buffer)))
- (and (not (string-equal name ""))
- (/= (aref name 0) ? )
- (yes-or-no-p
- (format "Buffer %s %s. Kill? "
- name
- (if (buffer-modified-p buffer)
- "HAS BEEN EDITED" "is unmodified")))
- (kill-buffer buffer)))
- (setq list (cdr list)))))
-
- (defun auto-save-mode (arg)
- "Toggle auto-saving of contents of current buffer.
- With arg, turn auto-saving on if arg is positive, else off."
- (interactive "P")
- (setq buffer-auto-save-file-name
- (and (if (null arg)
- (not buffer-auto-save-file-name)
- (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0))))
- (if (and buffer-file-name auto-save-visited-file-name
- (not buffer-read-only))
- buffer-file-name
- (make-auto-save-file-name))))
- (if (interactive-p)
- (message "Auto-save %s (in this buffer)"
- (if buffer-auto-save-file-name "on" "off")))
- buffer-auto-save-file-name)
-
- (defun rename-auto-save-file ()
- "Adjust current buffer's auto save file name for current conditions.
- Also rename any existing auto save file, if it was made in this session."
- (let ((osave buffer-auto-save-file-name))
- (setq buffer-auto-save-file-name
- (make-auto-save-file-name))
- (if (and osave buffer-auto-save-file-name
- (not (string= buffer-auto-save-file-name buffer-file-name))
- (not (string= buffer-auto-save-file-name osave))
- (file-exists-p osave)
- (recent-auto-save-p))
- (rename-file osave buffer-auto-save-file-name t))))
-
- (defun make-auto-save-file-name ()
- "Return file name to use for auto-saves of current buffer.
- Does not consider auto-save-visited-file-name; that is checked
- before calling this function.
- You can redefine this for customization.
- See also auto-save-file-name-p."
- (if buffer-file-name
- (concat (file-name-directory buffer-file-name)
- "#"
- (file-name-nondirectory buffer-file-name)
- "#")
- ;; For non-file bfr, use bfr name and Emacs pid.
- (expand-file-name (format "#%s#%s#" (buffer-name) (make-temp-name "")))))
-
- (defun auto-save-file-name-p (filename)
- "Return non-nil if FILENAME can be yielded by make-auto-save-file-name.
- FILENAME should lack slashes.
- You can redefine this for customization."
- (string-match "^#.*#$" filename))
-
- (defconst list-directory-brief-switches
- (if (eq system-type 'vax-vms) "" "-CF")
- "*Switches for list-directory to pass to `ls' for brief listing,")
-
- (defconst list-directory-verbose-switches
- (if (eq system-type 'vax-vms)
- "/PROTECTION/SIZE/DATE/OWNER/WIDTH=(OWNER:10)"
- "-l")
- "*Switches for list-directory to pass to `ls' for verbose listing,")
-
- (defun list-directory (dirname &optional verbose)
- "Display a list of files in or matching DIRNAME, a la `ls'.
- DIRNAME is globbed by the shell if necessary.
- Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
- Actions controlled by variables list-directory-brief-switches
- and list-directory-verbose-switches."
- (interactive (let ((pfx current-prefix-arg))
- (list (read-file-name (if pfx "List directory (verbose): "
- "List directory (brief): ")
- nil default-directory nil)
- pfx)))
- (let ((switches (if verbose list-directory-verbose-switches
- list-directory-brief-switches)))
- (or dirname (setq dirname default-directory))
- (setq dirname (expand-file-name dirname))
- (with-output-to-temp-buffer "*Directory*"
- (buffer-disable-undo standard-output)
- (princ "Directory ")
- (princ dirname)
- (terpri)
- (if (eq system-type 'vax-vms)
- (vms-read-directory dirname switches standard-output)
- (if (file-directory-p dirname)
- (save-excursion
- (set-buffer "*Directory*")
- (call-process "ls" nil standard-output nil switches
- (setq default-directory
- (file-name-as-directory dirname))))
- (let ((default-directory (file-name-directory dirname)))
- (if (file-exists-p default-directory)
- (call-process shell-file-name nil standard-output nil
- "-c" (concat "exec ls "
- switches " "
- (file-name-nondirectory dirname)))
- (princ "No such directory: ")
- (princ dirname)
- (terpri))))))))
-
- (defun save-buffers-kill-emacs (&optional arg)
- "Offer to save each buffer, then kill this Emacs process.
- With prefix arg, silently save all file-visiting buffers, then kill."
- (interactive "P")
- (save-some-buffers arg t)
- (and (or (not (memq t (mapcar (function
- (lambda (buf) (and (buffer-file-name buf)
- (buffer-modified-p buf))))
- (buffer-list))))
- (yes-or-no-p "Modified buffers exist; exit anyway? "))
- (or (not (fboundp 'process-list))
- ;; process-list is not defined on VMS.
- (let ((processes (process-list))
- active)
- (while processes
- (and (memq (process-status (car processes)) '(run stop open))
- (let ((val (process-kill-without-query (car processes))))
- (process-kill-without-query (car processes) val)
- val)
- (setq active t))
- (setq processes (cdr processes)))
- (or (not active)
- (yes-or-no-p "Active processes exist; kill them and exit anyway? "))))
- (kill-emacs)))
-