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1997 lines
77 KiB
EmacsLisp
1997 lines
77 KiB
EmacsLisp
;;; files.el --- file input and output commands for Emacs
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;; Copyright (C) 1985, 1986, 1987, 1992, 1993 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; Defines most of Emacs's file- and directory-handling functions,
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;; including basic file visiting, backup generation, link handling,
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;; ITS-id version control, load- and write-hook handling, and the like.
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;;; Code:
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(defconst delete-auto-save-files t
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"*Non-nil means delete a buffer's auto-save file when the buffer is saved.")
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(defconst directory-abbrev-alist
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nil
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"*Alist of abbreviations for file directories.
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A list of elements of the form (FROM . TO), each meaning to replace
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FROM with TO when it appears in a directory name. This replacement is
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done when setting up the default directory of a newly visited file.
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*Every* FROM string should start with `^'.
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Do not use `~' in the TO strings.
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They should be ordinary absolute directory names.
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Use this feature when you have directories which you normally refer to
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via absolute symbolic links. Make TO the name of the link, and FROM
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the name it is linked to.")
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;;; Turn off backup files on VMS since it has version numbers.
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(defconst make-backup-files (not (eq system-type 'vax-vms))
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"*Non-nil means make a backup of a file the first time it is saved.
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This can be done by renaming the file or by copying.
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Renaming means that Emacs renames the existing file so that it is a
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backup file, then writes the buffer into a new file. Any other names
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that the old file had will now refer to the backup file. The new file
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is owned by you and its group is defaulted.
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Copying means that Emacs copies the existing file into the backup
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file, then writes the buffer on top of the existing file. Any other
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names that the old file had will now refer to the new (edited) file.
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The file's owner and group are unchanged.
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The choice of renaming or copying is controlled by the variables
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`backup-by-copying', `backup-by-copying-when-linked' and
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`backup-by-copying-when-mismatch'. See also `backup-inhibited'.")
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;; Do this so that local variables based on the file name
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;; are not overridden by the major mode.
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(defvar backup-inhibited nil
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"Non-nil means don't make a backup, regardless of the other parameters.
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This variable is intended for use by making it local to a buffer.
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But it is local only if you make it local.")
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(put 'backup-inhibited 'permanent-local t)
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(defconst backup-by-copying nil
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"*Non-nil means always use copying to create backup files.
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See documentation of variable `make-backup-files'.")
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(defconst backup-by-copying-when-linked nil
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"*Non-nil means use copying to create backups for files with multiple names.
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This causes the alternate names to refer to the latest version as edited.
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This variable is relevant only if `backup-by-copying' is nil.")
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(defconst backup-by-copying-when-mismatch nil
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"*Non-nil means create backups by copying if this preserves owner or group.
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Renaming may still be used (subject to control of other variables)
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when it would not result in changing the owner or group of the file;
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that is, for files which are owned by you and whose group matches
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the default for a new file created there by you.
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This variable is relevant only if `backup-by-copying' is nil.")
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(defvar backup-enable-predicate
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'(lambda (name)
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(or (< (length name) 5)
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(not (string-equal "/tmp/" (substring name 0 5)))))
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"Predicate that looks at a file name and decides whether to make backups.
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Called with an absolute file name as argument, it returns t to enable backup.")
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(defconst buffer-offer-save nil
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"*Non-nil in a buffer means offer to save the buffer on exit
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even if the buffer is not visiting a file.
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Automatically local in all buffers.")
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(make-variable-buffer-local 'buffer-offer-save)
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(defconst find-file-existing-other-name nil
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"*Non-nil means find a file under alternative names, in existing buffers.
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This means if any existing buffer is visiting the file you want
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under another name, you get the existing buffer instead of a new buffer.")
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(defconst find-file-visit-truename nil
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"*Non-nil means visit a file under its truename.
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The truename of a file is found by chasing all links
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both at the file level and at the levels of the containing directories.")
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(defvar buffer-file-truename nil
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"The truename of the file visited in the current buffer.
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This variable is automatically local in all buffers, when non-nil.")
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(make-variable-buffer-local 'buffer-file-truename)
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(put 'buffer-file-truename 'permanent-local t)
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(defvar buffer-file-number nil
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"The device number and file number of the file visited in the current buffer.
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The value is a list of the form (FILENUM DEVNUM).
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This pair of numbers uniquely identifies the file.
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If the buffer is visiting a new file, the value is nil.")
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(make-variable-buffer-local 'buffer-file-number)
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(put 'buffer-file-number 'permanent-local t)
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(defconst file-precious-flag nil
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"*Non-nil means protect against I/O errors while saving files.
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Some modes set this non-nil in particular buffers.")
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(defvar version-control nil
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"*Control use of version numbers for backup files.
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t means make numeric backup versions unconditionally.
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nil means make them for files that have some already.
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never means do not make them.")
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(defvar dired-kept-versions 2
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"*When cleaning directory, number of versions to keep.")
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(defvar trim-versions-without-asking nil
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"*If t, deletes excess backup versions silently.
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If nil, asks confirmation. Any other value prevents any trimming.")
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(defvar kept-old-versions 2
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"*Number of oldest versions to keep when a new numbered backup is made.")
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(defvar kept-new-versions 2
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"*Number of newest versions to keep when a new numbered backup is made.
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Includes the new backup. Must be > 0")
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(defconst require-final-newline nil
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"*Value of t says silently ensure a file ends in a newline when it is saved.
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Non-nil but not t says ask user whether to add a newline when there isn't one.
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nil means don't add newlines.")
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(defconst auto-save-default t
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"*Non-nil says by default do auto-saving of every file-visiting buffer.")
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(defconst auto-save-visited-file-name nil
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"*Non-nil says auto-save a buffer in the file it is visiting, when practical.
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Normally auto-save files are written under other names.")
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(defconst save-abbrevs nil
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"*Non-nil means save word abbrevs too when files are saved.
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Loading an abbrev file sets this to t.")
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(defconst find-file-run-dired t
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"*Non-nil says run dired if `find-file' is given the name of a directory.")
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;;;It is not useful to make this a local variable.
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;;;(put 'find-file-not-found-hooks 'permanent-local t)
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(defvar find-file-not-found-hooks nil
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"List of functions to be called for `find-file' on nonexistent file.
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These functions are called as soon as the error is detected.
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`buffer-file-name' is already set up.
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The functions are called in the order given until one of them returns non-nil.")
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;;;It is not useful to make this a local variable.
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;;;(put 'find-file-hooks 'permanent-local t)
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(defvar find-file-hooks nil
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"List of functions to be called after a buffer is loaded from a file.
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The buffer's local variables (if any) will have been processed before the
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functions are called.")
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(defvar write-file-hooks nil
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"List of functions to be called before writing out a buffer to a file.
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If one of them returns non-nil, the file is considered already written
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and the rest are not called.
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These hooks are considered to pertain to the visited file.
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So this list is cleared if you change the visited file name.
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See also `write-contents-hooks'.
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Don't make this variable buffer-local; instead, use `local-write-file-hooks'.")
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;;; However, in case someone does make it local...
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(put 'write-file-hooks 'permanent-local t)
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(defvar local-write-file-hooks nil
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"Just like `write-file-hooks', except intended for per-buffer use.
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The functions in this list are called before the ones in
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`write-file-hooks'.")
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(make-variable-buffer-local 'local-write-file-hooks)
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(put 'local-write-file-hooks 'permanent-local t)
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(defvar write-contents-hooks nil
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"List of functions to be called before writing out a buffer to a file.
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If one of them returns non-nil, the file is considered already written
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and the rest are not called.
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These hooks are considered to pertain to the buffer's contents,
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not to the particular visited file; thus, `set-visited-file-name' does
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not clear this variable, but changing the major mode does clear it.
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See also `write-file-hooks'.")
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(defconst enable-local-variables t
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"*Control use of local-variables lists in files you visit.
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The value can be t, nil or something else.
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A value of t means local-variables lists are obeyed;
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nil means they are ignored; anything else means query.
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The command \\[normal-mode] always obeys local-variables lists
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and ignores this variable.")
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(defconst enable-local-eval 'maybe
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"*Control processing of the \"variable\" `eval' in a file's local variables.
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The value can be t, nil or something else.
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A value of t means obey `eval' variables;
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nil means ignore them; anything else means query.
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The command \\[normal-mode] always obeys local-variables lists
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and ignores this variable.")
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;; Avoid losing in versions where CLASH_DETECTION is disabled.
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(or (fboundp 'lock-buffer)
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(defalias 'lock-buffer 'ignore))
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(or (fboundp 'unlock-buffer)
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(defalias 'unlock-buffer 'ignore))
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;; This hook function provides support for ange-ftp host name
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;; completion. It runs the usual ange-ftp hook, but only for
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;; completion operations. Having this here avoids the need
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;; to load ange-ftp when it's not really in use.
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(defun ange-ftp-completion-hook-function (op &rest args)
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(if (memq op '(file-name-completion file-name-all-completions))
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(apply 'ange-ftp-hook-function op args)
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(let (file-name-handler-alist)
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(apply op args))))
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(defun pwd ()
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"Show the current default directory."
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(interactive nil)
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(message "Directory %s" default-directory))
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(defvar cd-path nil
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"Value of the CDPATH environment variable, as a list.
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Not actually set up until the first time you you use it.")
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(defun parse-colon-path (cd-path)
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"Explode a colon-separated list of paths into a string list."
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(and cd-path
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(let (cd-prefix cd-list (cd-start 0) cd-colon)
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(setq cd-path (concat cd-path ":"))
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(while (setq cd-colon (string-match ":" cd-path cd-start))
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(setq cd-list
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(nconc cd-list
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(list (if (= cd-start cd-colon)
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nil
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(substitute-in-file-name
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(file-name-as-directory
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(substring cd-path cd-start cd-colon)))))))
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(setq cd-start (+ cd-colon 1)))
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cd-list)))
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(defun cd-absolute (dir)
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"Change current directory to given absolute file name DIR."
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(setq dir (abbreviate-file-name (expand-file-name dir)))
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(if (not (eq system-type 'vax-vms))
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(setq dir (file-name-as-directory dir)))
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(if (not (file-directory-p dir))
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(error "%s is not a directory" dir)
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(if (file-executable-p dir)
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(setq default-directory dir)
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(error "Cannot cd to %s: Permission denied" dir))))
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(defun cd (dir)
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"Make DIR become the current buffer's default directory.
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If your environment includes a `CDPATH' variable, try each one of that
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colon-separated list of directories when resolving a relative directory name."
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(interactive "FChange default directory: ")
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(if (file-name-absolute-p dir)
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(cd-absolute (expand-file-name dir))
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(if (null cd-path)
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(let ((trypath (parse-colon-path (getenv "CDPATH"))))
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(setq cd-path (or trypath (list "./")))))
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(if (not (catch 'found
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(mapcar
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(function (lambda (x)
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(let ((f (expand-file-name (concat x dir))))
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(if (file-directory-p f)
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(progn
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(cd-absolute f)
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(throw 'found t))))))
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cd-path)
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nil))
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(error "No such directory found via CDPATH environment variable"))))
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(defun load-file (file)
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"Load the Lisp file named FILE."
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(interactive "fLoad file: ")
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(load (expand-file-name file) nil nil t))
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(defun load-library (library)
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"Load the library named LIBRARY.
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This is an interface to the function `load'."
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(interactive "sLoad library: ")
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(load library))
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;; OTHER is the other file to be compared.
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(defun file-local-copy (file)
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"Copy the file FILE into a temporary file on this machine.
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Returns the name of the local copy, or nil, if FILE is directly
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accessible."
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(let ((handler (find-file-name-handler file)))
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(if handler
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(funcall handler 'file-local-copy file)
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nil)))
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(defun file-truename (filename)
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"Return the truename of FILENAME, which should be absolute.
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The truename of a file name is found by chasing symbolic links
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both at the level of the file and at the level of the directories
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containing it, until no links are left at any level."
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(if (or (string= filename "~")
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(and (string= (substring filename 0 1) "~")
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(string-match "~[^/]*" filename)))
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(progn
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(setq filename (expand-file-name filename))
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(if (string= filename "")
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(setq filename "/"))))
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(let ((handler (find-file-name-handler filename)))
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;; For file name that has a special handler, call handler.
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;; This is so that ange-ftp can save time by doing a no-op.
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(if handler
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(funcall handler 'file-truename filename)
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(let ((dir (file-name-directory filename))
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target dirfile)
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;; Get the truename of the directory.
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(setq dirfile (directory-file-name dir))
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;; If these are equal, we have the (or a) root directory.
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(or (string= dir dirfile)
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(setq dir (file-name-as-directory (file-truename dirfile))))
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(if (equal ".." (file-name-nondirectory filename))
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(directory-file-name (file-name-directory (directory-file-name dir)))
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(if (equal "." (file-name-nondirectory filename))
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(directory-file-name dir)
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;; Put it back on the file name.
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(setq filename (concat dir (file-name-nondirectory filename)))
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;; Is the file name the name of a link?
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(setq target (file-symlink-p filename))
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(if target
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;; Yes => chase that link, then start all over
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;; since the link may point to a directory name that uses links.
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;; We can't safely use expand-file-name here
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;; since target might look like foo/../bar where foo
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;; is itself a link. Instead, we handle . and .. above.
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(if (file-name-absolute-p target)
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(file-truename target)
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(file-truename (concat dir target)))
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;; No, we are done!
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filename)))))))
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(defun file-chase-links (filename)
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"Chase links in FILENAME until a name that is not a link.
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Does not examine containing directories for links,
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unlike `file-truename'."
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(let (tem (count 100) (newname filename))
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(while (setq tem (file-symlink-p newname))
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(if (= count 0)
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(error "Apparent cycle of symbolic links for %s" filename))
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;; Handle `..' by hand, since it needs to work in the
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;; target of any directory symlink.
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;; This code is not quite complete; it does not handle
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;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
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(while (string-match "\\.\\./" tem)
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(setq tem (substring tem 3))
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(setq newname (file-name-as-directory
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;; Do the .. by hand.
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(directory-file-name
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(file-name-directory
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;; Chase links in the default dir of the symlink.
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(file-chase-links
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(directory-file-name
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(file-name-directory newname))))))))
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(setq newname (expand-file-name tem (file-name-directory newname)))
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(setq count (1- count)))
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newname))
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(defun switch-to-buffer-other-window (buffer)
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"Select buffer BUFFER in another window."
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(interactive "BSwitch to buffer in other window: ")
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(let ((pop-up-windows t))
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(pop-to-buffer buffer t)))
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(defun switch-to-buffer-other-frame (buffer)
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"Switch to buffer BUFFER in another frame."
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(interactive "BSwitch to buffer in other frame: ")
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(let ((pop-up-frames t))
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(pop-to-buffer buffer t)))
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(defun find-file (filename)
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"Edit file FILENAME.
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Switch to a buffer visiting file FILENAME,
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creating one if none already exists."
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(interactive "FFind file: ")
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(switch-to-buffer (find-file-noselect filename)))
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(defun find-file-other-window (filename)
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"Edit file FILENAME, in another window.
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May create a new window, or reuse an existing one.
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See the function `display-buffer'."
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(interactive "FFind file in other window: ")
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(switch-to-buffer-other-window (find-file-noselect filename)))
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(defun find-file-other-frame (filename)
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"Edit file FILENAME, in another frame.
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May create a new frame, or reuse an existing one.
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See the function `display-buffer'."
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(interactive "FFind file in other frame: ")
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(switch-to-buffer-other-frame (find-file-noselect filename)))
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(defun find-file-read-only (filename)
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"Edit file FILENAME but don't allow changes.
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Like \\[find-file] but marks buffer as read-only.
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Use \\[toggle-read-only] to permit editing."
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(interactive "fFind file read-only: ")
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(find-file filename)
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(setq buffer-read-only t)
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(current-buffer))
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(defun find-file-read-only-other-window (filename)
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"Edit file FILENAME in another window but don't allow changes.
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Like \\[find-file-other-window] but marks buffer as read-only.
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Use \\[toggle-read-only] to permit editing."
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(interactive "fFind file read-only other window: ")
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(find-file-other-window filename)
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(setq buffer-read-only t)
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(current-buffer))
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(defun find-file-read-only-other-frame (filename)
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"Edit file FILENAME in another frame but don't allow changes.
|
||
Like \\[find-file-other-frame] but marks buffer as read-only.
|
||
Use \\[toggle-read-only] to permit editing."
|
||
(interactive "fFind file read-only other frame: ")
|
||
(find-file-other-frame filename)
|
||
(setq buffer-read-only t)
|
||
(current-buffer))
|
||
|
||
(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)
|
||
(onum buffer-file-number)
|
||
(otrue buffer-file-truename)
|
||
(oname (buffer-name)))
|
||
(rename-buffer " **lose**")
|
||
(setq buffer-file-name nil)
|
||
(setq buffer-file-number nil)
|
||
(setq buffer-file-truename nil)
|
||
(unwind-protect
|
||
(progn
|
||
(unlock-buffer)
|
||
(find-file filename))
|
||
(cond ((eq obuf (current-buffer))
|
||
(setq buffer-file-name ofile)
|
||
(setq buffer-file-number onum)
|
||
(setq buffer-file-truename otrue)
|
||
(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 generate-new-buffer (name)
|
||
"Create and return a buffer with a name based on NAME.
|
||
Choose the buffer's name using `generate-new-buffer-name'."
|
||
(get-buffer-create (generate-new-buffer-name name)))
|
||
|
||
(defconst automount-dir-prefix "^/tmp_mnt/"
|
||
"Regexp to match the automounter prefix in a directory name.")
|
||
|
||
(defvar abbreviated-home-dir nil
|
||
"The user's homedir abbreviated according to `directory-abbrev-list'.")
|
||
|
||
(defun abbreviate-file-name (filename)
|
||
"Return a version of FILENAME shortened using `directory-abbrev-alist'.
|
||
This also substitutes \"~\" for the user's home directory.
|
||
Type \\[describe-variable] directory-abbrev-alist RET for more information."
|
||
;; Get rid of the prefixes added by the automounter.
|
||
(if (and (string-match automount-dir-prefix filename)
|
||
(file-exists-p (file-name-directory
|
||
(substring filename (1- (match-end 0))))))
|
||
(setq filename (substring filename (1- (match-end 0)))))
|
||
(let ((tail directory-abbrev-alist))
|
||
;; If any elt of directory-abbrev-alist matches this name,
|
||
;; abbreviate accordingly.
|
||
(while tail
|
||
(if (string-match (car (car tail)) filename)
|
||
(setq filename
|
||
(concat (cdr (car tail)) (substring filename (match-end 0)))))
|
||
(setq tail (cdr tail)))
|
||
;; Compute and save the abbreviated homedir name.
|
||
;; We defer computing this until the first time it's needed, to
|
||
;; give time for directory-abbrev-alist to be set properly.
|
||
;; We include a slash at the end, to avoid spurious matches
|
||
;; such as `/usr/foobar' when the home dir is `/usr/foo'.
|
||
(or abbreviated-home-dir
|
||
(setq abbreviated-home-dir
|
||
(let ((abbreviated-home-dir "$foo"))
|
||
(concat "^" (abbreviate-file-name (expand-file-name "~"))
|
||
"\\(/\\|$\\)"))))
|
||
|
||
;; If FILENAME starts with the abbreviated homedir,
|
||
;; make it start with `~' instead.
|
||
(if (string-match abbreviated-home-dir filename)
|
||
(setq filename
|
||
(concat "~"
|
||
;; If abbreviated-home-dir ends with a slash,
|
||
;; don't remove the corresponding slash from
|
||
;; filename. On MS-DOS and OS/2, you can have
|
||
;; home directories like "g:/", in which it is
|
||
;; important not to remove the slash. And what
|
||
;; about poor root on Unix systems?
|
||
(if (eq ?/ (aref abbreviated-home-dir
|
||
(1- (length abbreviated-home-dir))))
|
||
"/"
|
||
"")
|
||
(substring filename (match-beginning 1) (match-end 1))
|
||
(substring filename (match-end 0)))))
|
||
filename))
|
||
|
||
(defvar find-file-not-true-dirname-list nil
|
||
"*List of logical names for which visiting shouldn't save the true dirname.
|
||
On VMS, when you visit a file using a logical name that searches a path,
|
||
you may or may not want the visited file name to record the specific
|
||
directory where the file was found. If you *do not* want that, add the logical
|
||
name to this list as a string.")
|
||
|
||
(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))
|
||
(truename (abbreviate-file-name (file-truename filename)))
|
||
(number (nthcdr 10 (file-attributes truename)))
|
||
;; Find any buffer for a file which has same truename.
|
||
(same-truename
|
||
(or buf ; Shortcut
|
||
(let (found
|
||
(list (buffer-list)))
|
||
(while (and (not found) list)
|
||
(save-excursion
|
||
(set-buffer (car list))
|
||
(if (and buffer-file-name
|
||
(string= buffer-file-truename truename))
|
||
(setq found (car list))))
|
||
(setq list (cdr list)))
|
||
found)))
|
||
(same-number
|
||
(or buf ; Shortcut
|
||
(and number
|
||
(let (found
|
||
(list (buffer-list)))
|
||
(while (and (not found) list)
|
||
(save-excursion
|
||
(set-buffer (car list))
|
||
(if (and (equal buffer-file-number number)
|
||
;; Verify this buffer's file number
|
||
;; still belongs to its file.
|
||
(file-exists-p buffer-file-name)
|
||
(equal (nthcdr 10 (file-attributes buffer-file-name)) number))
|
||
(setq found (car list))))
|
||
(setq list (cdr list)))
|
||
found))))
|
||
error)
|
||
;; Let user know if there is a buffer with the same truename.
|
||
(if (and (not buf) same-truename (not nowarn))
|
||
(message "%s and %s are the same file (%s)"
|
||
filename (buffer-file-name same-truename)
|
||
truename)
|
||
(if (and (not buf) same-number (not nowarn))
|
||
(message "%s and %s are the same file"
|
||
filename (buffer-file-name same-number))))
|
||
|
||
;; Optionally also find that buffer.
|
||
(if (or find-file-existing-other-name find-file-visit-truename)
|
||
(setq buf (or same-truename same-number)))
|
||
(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
|
||
;;; The truename stuff makes this obsolete.
|
||
;;; (let* ((link-name (car (file-attributes filename)))
|
||
;;; (linked-buf (and (stringp link-name)
|
||
;;; (get-file-buffer link-name))))
|
||
;;; (if (bufferp linked-buf)
|
||
;;; (message "Symbolic link to file in buffer %s"
|
||
;;; (buffer-name linked-buf))))
|
||
(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 (and (funcall (car hooks))
|
||
;; If a hook succeeded, clear error.
|
||
(progn (setq error nil)
|
||
;; Also exit the loop.
|
||
t))))
|
||
(setq hooks (cdr hooks))))))
|
||
;; Find the file's truename, and maybe use that as visited name.
|
||
(setq buffer-file-truename (abbreviate-file-name truename))
|
||
(setq buffer-file-number number)
|
||
;; On VMS, we may want to remember which directory in a search list
|
||
;; the file was found in.
|
||
(and (eq system-type 'vax-vms)
|
||
(let (logical)
|
||
(if (string-match ":" (file-name-directory filename))
|
||
(setq logical (substring (file-name-directory filename)
|
||
0 (match-beginning 0))))
|
||
(not (member logical find-file-not-true-dirname-list)))
|
||
(setq buffer-file-name buffer-file-truename))
|
||
(if find-file-visit-truename
|
||
(setq buffer-file-name
|
||
(setq filename
|
||
(expand-file-name buffer-file-truename))))
|
||
;; Set buffer's default directory to that of the file.
|
||
(setq default-directory (file-name-directory filename))
|
||
;; Turn off backup files for certain file names. Since
|
||
;; this is a permanent local, the major mode won't eliminate it.
|
||
(and (not (funcall backup-enable-predicate buffer-file-name))
|
||
(progn
|
||
(make-local-variable 'backup-inhibited)
|
||
(setq backup-inhibited t)))
|
||
(after-find-file error (not nowarn))))
|
||
buf)))
|
||
|
||
(defun after-find-file (&optional error warn noauto)
|
||
"Called after finding a file and by the default revert function.
|
||
Sets buffer mode, parses local variables.
|
||
Optional args ERROR, WARN, and NOAUTO: 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.
|
||
NOAUTO means don't mess with auto-save mode.
|
||
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 cannot be read.")
|
||
((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)
|
||
"Note: file is write protected")
|
||
((file-attributes (directory-file-name default-directory))
|
||
"File not found and directory write-protected")
|
||
((file-exists-p (file-name-directory buffer-file-name))
|
||
(setq buffer-read-only nil))
|
||
(t
|
||
(setq buffer-read-only nil)
|
||
(if (file-exists-p (file-name-directory (directory-file-name (file-name-directory buffer-file-name))))
|
||
"Use M-x make-dir RET RET to create the directory"
|
||
"Use C-u M-x make-dir RET RET to create directory and its parents")))))
|
||
(if msg
|
||
(progn
|
||
(message msg)
|
||
(or not-serious (sit-for 1 nil t)))))
|
||
(if (and auto-save-default (not noauto))
|
||
(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)))
|
||
(condition-case err
|
||
(set-auto-mode)
|
||
(error (message "File mode specification error: %s"
|
||
(prin1-to-string err))))
|
||
(condition-case err
|
||
(let ((enable-local-variables (or (not find-file)
|
||
enable-local-variables)))
|
||
(hack-local-variables))
|
||
(error (message "File local-variables error: %s"
|
||
(prin1-to-string err)))))
|
||
|
||
(defvar auto-mode-alist (mapcar 'purecopy
|
||
'(("\\.text\\'" . text-mode)
|
||
("\\.c\\'" . c-mode)
|
||
("\\.h\\'" . c-mode)
|
||
("\\.tex\\'" . TeX-mode)
|
||
("\\.ltx\\'" . LaTeX-mode)
|
||
("\\.el\\'" . emacs-lisp-mode)
|
||
("\\.mm\\'" . nroff-mode)
|
||
("\\.me\\'" . nroff-mode)
|
||
("\\.ms\\'" . nroff-mode)
|
||
("\\.man\\'" . nroff-mode)
|
||
("\\.scm\\'" . scheme-mode)
|
||
("\\.l\\'" . lisp-mode)
|
||
("\\.lisp\\'" . lisp-mode)
|
||
("\\.f\\'" . fortran-mode)
|
||
("\\.for\\'" . fortran-mode)
|
||
("\\.mss\\'" . scribe-mode)
|
||
("\\.pl\\'" . prolog-mode)
|
||
("\\.cc\\'" . c++-mode)
|
||
("\\.hh\\'" . c++-mode)
|
||
("\\.C\\'" . c++-mode)
|
||
("\\.H\\'" . c++-mode)
|
||
;;; ("\\.mk\\'" . makefile-mode)
|
||
;;; ("[Mm]akefile" . makefile-mode)
|
||
;;; Less common extensions come here
|
||
;;; so more common ones above are found faster.
|
||
("\\.s\\'" . asm-mode)
|
||
("ChangeLog\\'" . change-log-mode)
|
||
("change.log\\'" . change-log-mode)
|
||
("ChangeLog.[0-9]+\\'" . change-log-mode)
|
||
("\\$CHANGE_LOG\\$\\.TXT" . change-log-mode)
|
||
;; The following should come after the ChangeLog pattern
|
||
;; for the sake of ChangeLog.1, etc.
|
||
("\\.[12345678]\\'" . nroff-mode)
|
||
("\\.TeX\\'" . TeX-mode)
|
||
("\\.sty\\'" . LaTeX-mode)
|
||
("\\.bbl\\'" . LaTeX-mode)
|
||
("\\.bib\\'" . bibtex-mode)
|
||
("\\.article\\'" . text-mode)
|
||
("\\.letter\\'" . text-mode)
|
||
("\\.texinfo\\'" . texinfo-mode)
|
||
("\\.texi\\'" . texinfo-mode)
|
||
("\\.lsp\\'" . lisp-mode)
|
||
("\\.awk\\'" . awk-mode)
|
||
("\\.prolog\\'" . prolog-mode)
|
||
("\\.tar\\'" . tar-mode)
|
||
;; Mailer puts message to be edited in
|
||
;; /tmp/Re.... or Message
|
||
("^/tmp/Re" . text-mode)
|
||
("/Message[0-9]*\\'" . text-mode)
|
||
;; some news reader is reported to use this
|
||
("^/tmp/fol/" . text-mode)
|
||
("\\.y\\'" . c-mode)
|
||
("\\.lex\\'" . c-mode)
|
||
("\\.oak\\'" . scheme-mode)
|
||
("\\.scm.[0-9]*\\'" . scheme-mode)
|
||
("\\.sgm\\'" . sgml-mode)
|
||
("\\.sgml\\'" . sgml-mode)
|
||
("\\.dtd\\'" . sgml-mode)
|
||
;; .emacs following a directory delimiter
|
||
;; in either Unix or VMS syntax.
|
||
("[]>:/]\\..*emacs\\'" . emacs-lisp-mode)
|
||
;; _emacs following a directory delimiter
|
||
;; in MsDos syntax
|
||
("[:/]_emacs\\'" . emacs-lisp-mode)
|
||
("\\.ml\\'" . lisp-mode)))
|
||
"\
|
||
Alist of filename patterns vs corresponding major mode functions.
|
||
Each element looks like (REGEXP . FUNCTION).
|
||
Visiting a file whose name matches REGEXP causes FUNCTION to be called.")
|
||
|
||
(defconst inhibit-local-variables-regexps '("\\.tar$")
|
||
"List of regexps; if one matches a file name, don't look for local vars.")
|
||
|
||
(defvar user-init-file
|
||
"" ; set by command-line
|
||
"File name including directory of user's initialization file.")
|
||
|
||
(defun set-auto-mode ()
|
||
"Select major mode appropriate for current buffer.
|
||
This checks for a -*- mode tag in the buffer's text, or
|
||
compares the filename against the entries in auto-mode-alist. It does
|
||
not check for the \"mode:\" local variable in the Local Variables
|
||
section of the file; for that, use `hack-local-variables'.
|
||
|
||
If `enable-local-variables' is nil, this function does not check for a
|
||
-*- mode tag."
|
||
;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
|
||
(let (beg end done)
|
||
(save-excursion
|
||
(goto-char (point-min))
|
||
(skip-chars-forward " \t\n")
|
||
(and enable-local-variables
|
||
;; Don't look for -*- if this file name matches any
|
||
;; of the regexps in inhibit-local-variables-regexps.
|
||
(let ((temp inhibit-local-variables-regexps))
|
||
(while (and temp
|
||
(not (string-match (car temp)
|
||
buffer-file-name)))
|
||
(setq temp (cdr temp)))
|
||
(not temp))
|
||
(search-forward "-*-" (save-excursion
|
||
;; If the file begins with "#!"
|
||
;; (exec interpreter magic), look
|
||
;; for mode frobs in the first two
|
||
;; lines. You cannot necessarily
|
||
;; put them in the first line of
|
||
;; such a file without screwing up
|
||
;; the interpreter invocation.
|
||
(end-of-line (and (looking-at "^#!") 2))
|
||
(point)) t)
|
||
(progn
|
||
(skip-chars-forward " \t")
|
||
(setq beg (point))
|
||
(search-forward "-*-"
|
||
(save-excursion (end-of-line) (point))
|
||
t))
|
||
(progn
|
||
(forward-char -3)
|
||
(skip-chars-backward " \t")
|
||
(setq end (point))
|
||
(goto-char beg)
|
||
(if (save-excursion (search-forward ":" end t))
|
||
;; Find all specifications for the `mode:' variable
|
||
;; and execute hem left to right.
|
||
(while (let ((case-fold-search t))
|
||
(search-forward "mode:" end t))
|
||
(skip-chars-forward " \t")
|
||
(setq beg (point))
|
||
(if (search-forward ";" end t)
|
||
(forward-char -1)
|
||
(goto-char end))
|
||
(skip-chars-backward " \t")
|
||
(funcall (intern (concat (downcase (buffer-substring beg (point))) "-mode"))))
|
||
;; Simple -*-MODE-*- case.
|
||
(funcall (intern (concat (downcase (buffer-substring beg end)) "-mode"))))
|
||
(setq done t)))
|
||
;; If we didn't find a mode from a -*- line, try using the file name.
|
||
(if (and (not done) buffer-file-name)
|
||
(let ((alist auto-mode-alist)
|
||
(name buffer-file-name)
|
||
mode)
|
||
(let ((case-fold-search (eq system-type 'vax-vms)))
|
||
;; Remove backup-suffixes from file name.
|
||
(setq name (file-name-sans-versions name))
|
||
;; 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-prop-line ()
|
||
;; Set local variables specified in the -*- line.
|
||
;; Ignore any specification for `mode:';
|
||
;; set-auto-mode should already have handled that.
|
||
(save-excursion
|
||
(goto-char (point-min))
|
||
(skip-chars-forward " \t\n\r")
|
||
(let ((result '())
|
||
(end (save-excursion (end-of-line) (point))))
|
||
;; 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]*-\\*-\\)")
|
||
;; Simple form: "-*- MODENAME -*-".
|
||
(setq result
|
||
(list (cons 'mode
|
||
(intern (buffer-substring
|
||
(match-beginning 1)
|
||
(match-end 1)))))))
|
||
(t
|
||
;; Hairy 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))))
|
||
|
||
(if (and result
|
||
(or (eq enable-local-variables t)
|
||
(and enable-local-variables
|
||
(save-window-excursion
|
||
(condition-case nil
|
||
(switch-to-buffer (current-buffer))
|
||
(error
|
||
;; If we fail to switch in the selected window,
|
||
;; it is probably a minibuffer.
|
||
;; So try another window.
|
||
(condition-case nil
|
||
(switch-to-buffer-other-window (current-buffer))
|
||
(error
|
||
(switch-to-buffer-other-frame (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))))
|
||
(or (eq key 'mode)
|
||
(hack-one-local-variable key val)))
|
||
(setq result (cdr result)))))))
|
||
|
||
(defun hack-local-variables ()
|
||
"Parse and put into effect this buffer's local variables spec."
|
||
(hack-local-variables-prop-line)
|
||
;; Look for "Local variables:" line in 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 (eq enable-local-variables t)
|
||
(and enable-local-variables
|
||
(save-window-excursion
|
||
(switch-to-buffer (current-buffer))
|
||
(save-excursion
|
||
(beginning-of-line)
|
||
(set-window-start (selected-window) (point)))
|
||
(y-or-n-p (format "Set local variables as specified at end of %s? "
|
||
(if buffer-file-name
|
||
(file-name-nondirectory
|
||
buffer-file-name)
|
||
(concat "buffer "
|
||
(buffer-name))))))))))
|
||
(let ((continue t)
|
||
prefix prefixlen suffix beg
|
||
(enable-local-eval enable-local-eval))
|
||
;; 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 (concat (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.
|
||
(hack-one-local-variable var val))))))))
|
||
|
||
(defconst ignored-local-variables
|
||
'(enable-local-eval)
|
||
"Variables to be ignored in a file's local variable spec.")
|
||
|
||
;; "Set" one variable in a local variables spec.
|
||
;; A few variable names are treated specially.
|
||
(defun hack-one-local-variable (var val)
|
||
(cond ((eq var 'mode)
|
||
(funcall (intern (concat (downcase (symbol-name val))
|
||
"-mode"))))
|
||
((memq var ignored-local-variables)
|
||
nil)
|
||
;; "Setting" eval means either eval it or do nothing.
|
||
;; Likewise for setting hook variables.
|
||
((or (memq var '(eval file-name-handler-alist after-load-alist))
|
||
(string-match "-hooks?$\\|-functions?$" (symbol-name var)))
|
||
(if (and (not (string= (user-login-name) "root"))
|
||
(or (eq enable-local-eval t)
|
||
(and enable-local-eval
|
||
(save-window-excursion
|
||
(switch-to-buffer (current-buffer))
|
||
(save-excursion
|
||
(beginning-of-line)
|
||
(set-window-start (selected-window) (point)))
|
||
(setq enable-local-eval
|
||
(y-or-n-p (format "Process `eval' or hook local variables in file %s? "
|
||
(file-name-nondirectory buffer-file-name))))))))
|
||
(if (eq var 'eval)
|
||
(save-excursion (eval val))
|
||
(make-local-variable var)
|
||
(set var val))
|
||
(message "Ignoring `eval:' in file's local variables")))
|
||
;; Ordinary variable, really set it.
|
||
(t (make-local-variable var)
|
||
(set var val))))
|
||
|
||
|
||
(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))
|
||
(or (string= new-name (buffer-name))
|
||
(rename-buffer new-name t))))
|
||
(setq buffer-backed-up nil)
|
||
(clear-visited-file-modtime)
|
||
(if filename
|
||
(progn
|
||
(setq buffer-file-truename
|
||
(abbreviate-file-name (file-truename buffer-file-name)))
|
||
(if find-file-visit-truename
|
||
(setq buffer-file-name buffer-file-truename))
|
||
(setq buffer-file-number (nth 10 (file-attributes buffer-file-name))))
|
||
(setq buffer-file-truename nil buffer-file-number nil))
|
||
;; 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 'local-write-file-hooks)
|
||
(kill-local-variable 'revert-buffer-function)
|
||
(kill-local-variable 'backup-inhibited)
|
||
;; Turn off backup files for certain file names.
|
||
;; Since this is a permanent local, the major mode won't eliminate it.
|
||
(and (not (funcall backup-enable-predicate buffer-file-name))
|
||
(progn
|
||
(make-local-variable 'backup-inhibited)
|
||
(setq backup-inhibited t)))
|
||
(let ((oauto buffer-auto-save-file-name))
|
||
;; If auto-save was not already on, turn it on if appropriate.
|
||
(if (not buffer-auto-save-file-name)
|
||
(and buffer-file-name auto-save-default
|
||
(auto-save-mode t))
|
||
;; If auto save is on, start using a new name.
|
||
;; We deliberately don't rename or delete the old auto save
|
||
;; for the old visited file name. This is because perhaps
|
||
;; the user wants to save the new state and then compare with the
|
||
;; previous state from the auto save file.
|
||
(setq buffer-auto-save-file-name
|
||
(make-auto-save-file-name)))
|
||
;; Rename the old auto save file if any.
|
||
(and oauto buffer-auto-save-file-name
|
||
(file-exists-p oauto)
|
||
(rename-file oauto buffer-auto-save-file-name t)))
|
||
(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.
|
||
If the buffer is already visiting a file, you can specify
|
||
a directory name as FILENAME, to write a file of the same
|
||
old name in that directory."
|
||
;; (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 "")
|
||
(progn
|
||
;; If arg is just a directory,
|
||
;; use same file name, but in that directory.
|
||
(if (and (file-directory-p filename) buffer-file-name)
|
||
(setq filename (concat (file-name-as-directory filename)
|
||
(file-name-nondirectory buffer-file-name))))
|
||
(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 backup-inhibited)
|
||
(not buffer-backed-up)
|
||
(file-exists-p buffer-file-name)
|
||
(memq (aref (elt (file-attributes buffer-file-name) 8) 0)
|
||
'(?- ?l)))
|
||
(let ((real-file-name buffer-file-name)
|
||
backup-info backupname targets setmodes)
|
||
;; 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.
|
||
(setq real-file-name (file-chase-links real-file-name))
|
||
(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 (eq trim-versions-without-asking t) (eq trim-versions-without-asking nil))
|
||
(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))))))
|
||
(condition-case ()
|
||
(copy-file real-file-name backupname t t)
|
||
(file-error
|
||
;; If copying fails because file BACKUPNAME
|
||
;; is not writable, delete that file and try again.
|
||
(if (and (file-exists-p backupname)
|
||
(not (file-writable-p backupname)))
|
||
(delete-file backupname))
|
||
(copy-file real-file-name backupname t t)))
|
||
;; rename-file should delete old backup.
|
||
(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)
|
||
(condition-case ()
|
||
(copy-file real-file-name backupname t t)
|
||
(file-error
|
||
;; If copying fails because file BACKUPNAME
|
||
;; is not writable, delete that file and try again.
|
||
(if (and (file-exists-p backupname)
|
||
(not (file-writable-p backupname)))
|
||
(delete-file backupname))
|
||
(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 &optional keep-backup-version)
|
||
"Return FILENAME sans backup versions or strings.
|
||
This is a separate procedure so your site-init or startup file can
|
||
redefine it.
|
||
If the optional argument KEEP-BACKUP-VERSION is non-nil,
|
||
we do not remove backup version numbers, only true file version numbers."
|
||
(let ((handler (find-file-name-handler name)))
|
||
(if handler
|
||
(funcall handler 'file-name-sans-versions name keep-backup-version)
|
||
(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))
|
||
(if keep-backup-version
|
||
(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."
|
||
(if (eq system-type 'ms-dos)
|
||
(let ((fn (file-name-nondirectory file)))
|
||
(concat (file-name-directory file)
|
||
(if (string-match "\\([^.]*\\)\\(\\..*\\)?" fn)
|
||
(substring fn 0 (match-end 1)))
|
||
".bak"))
|
||
(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."
|
||
(if (eq system-type 'ms-dos)
|
||
(string-match "\\.bak$" file)
|
||
(string-match "~$" file)))
|
||
|
||
;; This is used in various files.
|
||
;; The usage of bv-length is not very clean,
|
||
;; but I can't see a good alternative,
|
||
;; so as of now I am leaving it alone.
|
||
(defun backup-extract-version (fn)
|
||
"Given the name of a numeric backup file, return the backup number.
|
||
Uses the free variable `bv-length', whose value should be
|
||
the index in the name where the version number begins."
|
||
(if (and (string-match "[0-9]+~$" fn bv-length)
|
||
(= (match-beginning 0) bv-length))
|
||
(string-to-int (substring fn bv-length -1))
|
||
0))
|
||
|
||
;; 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))
|
||
possibilities
|
||
(versions nil)
|
||
(high-water-mark 0)
|
||
(deserve-versions-p nil)
|
||
(number-to-delete 0))
|
||
(condition-case ()
|
||
(setq possibilities (file-name-all-completions
|
||
base-versions
|
||
(file-name-directory fn))
|
||
versions (sort (mapcar
|
||
(function backup-extract-version)
|
||
possibilities)
|
||
'<)
|
||
high-water-mark (apply 'max 0 versions)
|
||
deserve-versions-p (or version-control
|
||
(> high-water-mark 0))
|
||
number-to-delete (- (length versions)
|
||
kept-old-versions kept-new-versions -1))
|
||
(file-error
|
||
(setq possibilities nil)))
|
||
(if (not deserve-versions-p)
|
||
(list (make-backup-file-name fn))
|
||
(cons (concat fn ".~" (int-to-string (1+ high-water-mark)) "~")
|
||
(if (and (> number-to-delete 0)
|
||
;; Delete nothing if there is overflow
|
||
;; in the number of versions to keep.
|
||
(>= (+ kept-new-versions kept-old-versions -1) 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 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 (expand-file-name
|
||
(or 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 auto-save file for current buffer if `delete-auto-save-files' is t.
|
||
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-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
|
||
(set-visited-file-name
|
||
(expand-file-name (read-file-name "File to save in: ") nil)))
|
||
(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 ((hooks (append write-contents-hooks local-write-file-hooks
|
||
write-file-hooks))
|
||
(done 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, write temp name, then rename it.
|
||
(let ((dir (file-name-directory buffer-file-name))
|
||
(realname buffer-file-name)
|
||
tempname temp nogood i succeed)
|
||
(setq i 0)
|
||
(setq nogood t)
|
||
;; Find the temporary name to write under.
|
||
(while nogood
|
||
(setq tempname (format "%s#tmp#%d" dir i))
|
||
(setq nogood (file-exists-p tempname))
|
||
(setq i (1+ i)))
|
||
(unwind-protect
|
||
(progn (clear-visited-file-modtime)
|
||
(write-region (point-min) (point-max)
|
||
tempname nil realname)
|
||
(setq succeed t))
|
||
;; If writing the temp file fails,
|
||
;; delete the temp file.
|
||
(or succeed (delete-file tempname)))
|
||
;; Since we have created an entirely new file
|
||
;; and renamed it, make sure it gets the
|
||
;; right permission bits set.
|
||
(setq setmodes (file-modes buffer-file-name))
|
||
;; We succeeded in writing the temp file,
|
||
;; so rename it.
|
||
(rename-file tempname buffer-file-name t))
|
||
;; 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)))
|
||
(write-region (point-min) (point-max)
|
||
buffer-file-name nil t)))))
|
||
(setq buffer-file-number (nth 10 (file-attributes 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)
|
||
(run-hooks 'after-save-hook))
|
||
(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")
|
||
(save-window-excursion
|
||
(let ((files-done
|
||
(map-y-or-n-p
|
||
(function
|
||
(lambda (buffer)
|
||
(and (buffer-modified-p buffer)
|
||
(or
|
||
(buffer-file-name buffer)
|
||
(and exiting
|
||
(progn
|
||
(set-buffer buffer)
|
||
(and buffer-offer-save (> (buffer-size) 0)))))
|
||
(if arg
|
||
t
|
||
(if (buffer-file-name buffer)
|
||
(format "Save file %s? "
|
||
(buffer-file-name buffer))
|
||
(format "Save buffer %s? "
|
||
(buffer-name buffer)))))))
|
||
(function
|
||
(lambda (buffer)
|
||
(set-buffer buffer)
|
||
(save-buffer)))
|
||
(buffer-list)
|
||
'("buffer" "buffers" "save")
|
||
(list (list ?\C-r (lambda (buf)
|
||
(view-buffer buf)
|
||
(setq view-exit-action
|
||
'(lambda (ignore)
|
||
(exit-recursive-edit)))
|
||
(recursive-edit)
|
||
;; Return nil to ask about BUF again.
|
||
nil)
|
||
"display the current buffer"))))
|
||
(abbrevs-done
|
||
(and save-abbrevs abbrevs-changed
|
||
(progn
|
||
(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)
|
||
t))))
|
||
(or (> files-done 0) abbrevs-done
|
||
(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: ")
|
||
(if (file-directory-p filename)
|
||
(signal 'file-error (list "Opening input file" "file is a directory"
|
||
filename)))
|
||
(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 (dir &optional parents)
|
||
"Create the directory DIR and any nonexistent parent dirs.
|
||
Interactively, the default choice of directory to create
|
||
is the current default directory for file names.
|
||
That is useful when you have visited a file in a nonexistint directory.
|
||
|
||
Noninteractively, the second (optional) argument PARENTS says whether
|
||
to create parent directories if they don't exist."
|
||
(interactive
|
||
(list (read-file-name "Make directory: " default-directory default-directory
|
||
nil nil)
|
||
t))
|
||
(let ((handler (find-file-name-handler dir)))
|
||
(if handler
|
||
(funcall handler 'make-directory dir parents)
|
||
(if (not parents)
|
||
(make-directory-internal dir)
|
||
(let ((dir (directory-file-name (expand-file-name dir)))
|
||
create-list)
|
||
(while (not (file-exists-p dir))
|
||
(setq create-list (cons dir create-list)
|
||
dir (directory-file-name (file-name-directory dir))))
|
||
(while create-list
|
||
(make-directory-internal (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 ignore-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, the first argument is IGNORE-AUTO; only offer
|
||
to revert from the auto-save file when this is nil. Note that the
|
||
sense of this argument is the reverse of the prefix argument, for the
|
||
sake of backward compatibility. IGNORE-AUTO is optional, defaulting
|
||
to nil.
|
||
|
||
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."
|
||
;; I admit it's odd to reverse the sense of the prefix argument, but
|
||
;; there is a lot of code out there which assumes that the first
|
||
;; argument should be t to avoid consulting the auto-save file, and
|
||
;; there's no straightforward way to encourage authors to notice a
|
||
;; reversal of the argument sense. So I'm just changing the user
|
||
;; interface, but leaving the programmatic interface the same.
|
||
(interactive (list (not prefix-arg)))
|
||
(if revert-buffer-function
|
||
(funcall revert-buffer-function ignore-auto noconfirm)
|
||
(let* ((opoint (point))
|
||
(auto-save-p (and (not ignore-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 nil t)
|
||
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 nil t))
|
||
(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 prefix argument ARG, turn auto-saving on if 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' as that variable 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)
|
||
(save-excursion
|
||
(set-buffer "*Directory*")
|
||
(let ((wildcard (not (file-directory-p dirname))))
|
||
(insert-directory dirname switches wildcard (not wildcard)))))))
|
||
|
||
(defvar insert-directory-program "ls"
|
||
"Absolute or relative name of the `ls' program used by `insert-directory'.")
|
||
|
||
;; insert-directory
|
||
;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
|
||
;; FULL-DIRECTORY-P is nil.
|
||
;; The single line of output must display FILE's name as it was
|
||
;; given, namely, an absolute path name.
|
||
;; - must insert exactly one line for each file if WILDCARD or
|
||
;; FULL-DIRECTORY-P is t, plus one optional "total" line
|
||
;; before the file lines, plus optional text after the file lines.
|
||
;; Lines are delimited by "\n", so filenames containing "\n" are not
|
||
;; allowed.
|
||
;; File lines should display the basename.
|
||
;; - must be consistent with
|
||
;; - functions dired-move-to-filename, (these two define what a file line is)
|
||
;; dired-move-to-end-of-filename,
|
||
;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
|
||
;; dired-insert-headerline
|
||
;; dired-after-subdir-garbage (defines what a "total" line is)
|
||
;; - variable dired-subdir-regexp
|
||
(defun insert-directory (file switches &optional wildcard full-directory-p)
|
||
"Insert directory listing for FILE, formatted according to SWITCHES.
|
||
Leaves point after the inserted text.
|
||
Optional third arg WILDCARD means treat FILE as shell wildcard.
|
||
Optional fourth arg FULL-DIRECTORY-P means file is a directory and
|
||
switches do not contain `d', so that a full listing is expected.
|
||
|
||
This works by running a directory listing program
|
||
whose name is in the variable `insert-directory-program'.
|
||
If WILDCARD, it also runs the shell specified by `shell-file-name'."
|
||
(let ((handler (find-file-name-handler file)))
|
||
(if handler
|
||
(funcall handler 'insert-directory file switches
|
||
wildcard full-directory-p)
|
||
(if (eq system-type 'vax-vms)
|
||
(vms-read-directory file switches (current-buffer))
|
||
(if wildcard
|
||
;; Run ls in the directory of the file pattern we asked for.
|
||
(let ((default-directory
|
||
(if (file-name-absolute-p file)
|
||
(file-name-directory file)
|
||
(file-name-directory (expand-file-name file)))))
|
||
(call-process shell-file-name nil t nil
|
||
"-c" (concat insert-directory-program
|
||
" -d " switches " "
|
||
(file-name-nondirectory file))))
|
||
;; SunOS 4.1.3, SVr4 and others need the "." to list the
|
||
;; directory if FILE is a symbolic link.
|
||
(call-process insert-directory-program nil t nil switches
|
||
(if full-directory-p
|
||
(concat (file-name-as-directory file) ".")
|
||
file)))))))
|
||
|
||
(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)))
|
||
|
||
(define-key ctl-x-map "\C-f" 'find-file)
|
||
(define-key ctl-x-map "\C-q" 'toggle-read-only)
|
||
(define-key ctl-x-map "\C-r" 'find-file-read-only)
|
||
(define-key ctl-x-map "\C-v" 'find-alternate-file)
|
||
(define-key ctl-x-map "\C-s" 'save-buffer)
|
||
(define-key ctl-x-map "s" 'save-some-buffers)
|
||
(define-key ctl-x-map "\C-w" 'write-file)
|
||
(define-key ctl-x-map "i" 'insert-file)
|
||
(define-key esc-map "~" 'not-modified)
|
||
(define-key ctl-x-map "\C-d" 'list-directory)
|
||
(define-key ctl-x-map "\C-c" 'save-buffers-kill-emacs)
|
||
|
||
(define-key ctl-x-4-map "f" 'find-file-other-window)
|
||
(define-key ctl-x-4-map "r" 'find-file-read-only-other-window)
|
||
(define-key ctl-x-4-map "\C-f" 'find-file-other-window)
|
||
(define-key ctl-x-4-map "b" 'switch-to-buffer-other-window)
|
||
(define-key ctl-x-4-map "\C-o" 'display-buffer)
|
||
|
||
(define-key ctl-x-5-map "b" 'switch-to-buffer-other-frame)
|
||
(define-key ctl-x-5-map "f" 'find-file-other-frame)
|
||
(define-key ctl-x-5-map "\C-f" 'find-file-other-frame)
|
||
(define-key ctl-x-5-map "r" 'find-file-read-only-other-frame)
|
||
|
||
;;; files.el ends here
|