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;;; files.el --- file input and output commands for Emacs
;; Copyright (C) 1985, 1986, 1987, 1992, 1993, 1994, 1995, 1996,
;; 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
;; 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
;; Maintainer: FSF
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Defines most of Emacs's file- and directory-handling functions,
;; including basic file visiting, backup generation, link handling,
;; ITS-id version control, load- and write-hook handling, and the like.
;;; Code:
(eval-when-compile (require 'cl))
(defvar font-lock-keywords)
(defgroup backup nil
"Backups of edited data files."
:group 'files)
(defgroup find-file nil
"Finding files."
:group 'files)
(defcustom delete-auto-save-files t
"Non-nil means delete auto-save file when a buffer is saved or killed.
Note that the auto-save file will not be deleted if the buffer is killed
when it has unsaved changes."
:type 'boolean
:group 'auto-save)
(defcustom directory-abbrev-alist
nil
"Alist of abbreviations for file directories.
A list of elements of the form (FROM . TO), each meaning to replace
FROM with TO when it appears in a directory name. This replacement is
done when setting up the default directory of a newly visited file.
FROM is matched against directory names anchored at the first
character, so it should start with a \"\\\\`\", or, if directory
names cannot have embedded newlines, with a \"^\".
FROM and TO should be equivalent names, which refer to the
same directory. Do not use `~' in the TO strings;
they should be ordinary absolute directory names.
Use this feature when you have directories which you normally refer to
via absolute symbolic links. Make TO the name of the link, and FROM
the name it is linked to."
:type '(repeat (cons :format "%v"
:value ("\\`" . "")
(regexp :tag "From")
(string :tag "To")))
:group 'abbrev
:group 'find-file)
(defcustom make-backup-files t
"Non-nil means make a backup of a file the first time it is saved.
This can be done by renaming the file or by copying.
Renaming means that Emacs renames the existing file so that it is a
backup file, then writes the buffer into a new file. Any other names
that the old file had will now refer to the backup file. The new file
is owned by you and its group is defaulted.
Copying means that Emacs copies the existing file into the backup
file, then writes the buffer on top of the existing file. Any other
names that the old file had will now refer to the new (edited) file.
The file's owner and group are unchanged.
The choice of renaming or copying is controlled by the variables
`backup-by-copying', `backup-by-copying-when-linked',
`backup-by-copying-when-mismatch' and
`backup-by-copying-when-privileged-mismatch'. See also `backup-inhibited'."
:type 'boolean
:group 'backup)
;; Do this so that local variables based on the file name
;; are not overridden by the major mode.
(defvar backup-inhibited nil
"Non-nil means don't make a backup, regardless of the other parameters.
This variable is intended for use by making it local to a buffer.
But it is local only if you make it local.")
(put 'backup-inhibited 'permanent-local t)
(defcustom backup-by-copying nil
"Non-nil means always use copying to create backup files.
See documentation of variable `make-backup-files'."
:type 'boolean
:group 'backup)
(defcustom backup-by-copying-when-linked nil
"Non-nil means use copying to create backups for files with multiple names.
This causes the alternate names to refer to the latest version as edited.
This variable is relevant only if `backup-by-copying' is nil."
:type 'boolean
:group 'backup)
(defcustom backup-by-copying-when-mismatch nil
"Non-nil means create backups by copying if this preserves owner or group.
Renaming may still be used (subject to control of other variables)
when it would not result in changing the owner or group of the file;
that is, for files which are owned by you and whose group matches
the default for a new file created there by you.
This variable is relevant only if `backup-by-copying' is nil."
:type 'boolean
:group 'backup)
(put 'backup-by-copying-when-mismatch 'permanent-local t)
(defcustom backup-by-copying-when-privileged-mismatch 200
"Non-nil means create backups by copying to preserve a privileged owner.
Renaming may still be used (subject to control of other variables)
when it would not result in changing the owner of the file or if the owner
has a user id greater than the value of this variable. This is useful
when low-numbered uid's are used for special system users (such as root)
that must maintain ownership of certain files.
This variable is relevant only if `backup-by-copying' and
`backup-by-copying-when-mismatch' are nil."
:type '(choice (const nil) integer)
:group 'backup)
(defvar backup-enable-predicate 'normal-backup-enable-predicate
"Predicate that looks at a file name and decides whether to make backups.
Called with an absolute file name as argument, it returns t to enable backup.")
(defcustom buffer-offer-save nil
"Non-nil in a buffer means always offer to save buffer on exit.
Do so even if the buffer is not visiting a file.
Automatically local in all buffers."
:type 'boolean
:group 'backup)
(make-variable-buffer-local 'buffer-offer-save)
(defcustom find-file-existing-other-name t
"Non-nil means find a file under alternative names, in existing buffers.
This means if any existing buffer is visiting the file you want
under another name, you get the existing buffer instead of a new buffer."
:type 'boolean
:group 'find-file)
(defcustom find-file-visit-truename nil
"Non-nil means visit a file under its truename.
The truename of a file is found by chasing all links
both at the file level and at the levels of the containing directories."
:type 'boolean
:group 'find-file)
(put 'find-file-visit-truename 'safe-local-variable 'booleanp)
(defcustom revert-without-query nil
"Specify which files should be reverted without query.
The value is a list of regular expressions.
If the file name matches one of these regular expressions,
then `revert-buffer' reverts the file without querying
if the file has changed on disk and you have not edited the buffer."
:type '(repeat regexp)
:group 'find-file)
(defvar buffer-file-number nil
"The device number and file number of the file visited in the current buffer.
The value is a list of the form (FILENUM DEVNUM).
This pair of numbers uniquely identifies the file.
If the buffer is visiting a new file, the value is nil.")
(make-variable-buffer-local 'buffer-file-number)
(put 'buffer-file-number 'permanent-local t)
(defvar buffer-file-numbers-unique (not (memq system-type '(windows-nt)))
"Non-nil means that `buffer-file-number' uniquely identifies files.")
(defvar buffer-file-read-only nil
"Non-nil if visited file was read-only when visited.")
(make-variable-buffer-local 'buffer-file-read-only)
(defcustom temporary-file-directory
(file-name-as-directory
(cond ((memq system-type '(ms-dos windows-nt))
(or (getenv "TEMP") (getenv "TMPDIR") (getenv "TMP") "c:/temp"))
(t
(or (getenv "TMPDIR") (getenv "TMP") (getenv "TEMP") "/tmp"))))
"The directory for writing temporary files."
:group 'files
:initialize 'custom-initialize-delay
:type 'directory)
(defcustom small-temporary-file-directory
(if (eq system-type 'ms-dos) (getenv "TMPDIR"))
"The directory for writing small temporary files.
If non-nil, this directory is used instead of `temporary-file-directory'
by programs that create small temporary files. This is for systems that
have fast storage with limited space, such as a RAM disk."
:group 'files
:initialize 'custom-initialize-delay
:type '(choice (const nil) directory))
;; The system null device. (Should reference NULL_DEVICE from C.)
(defvar null-device (purecopy "/dev/null") "The system null device.")
(declare-function msdos-long-file-names "msdos.c")
(declare-function w32-long-file-name "w32proc.c")
(declare-function dired-get-filename "dired" (&optional localp no-error-if-not-filep))
(declare-function dired-unmark "dired" (arg))
(declare-function dired-do-flagged-delete "dired" (&optional nomessage))
(declare-function dos-8+3-filename "dos-fns" (filename))
(declare-function view-mode-disable "view" ())
(declare-function dosified-file-name "dos-fns" (file-name))
(defvar file-name-invalid-regexp
(cond ((and (eq system-type 'ms-dos) (not (msdos-long-file-names)))
(purecopy
(concat "^\\([^A-Z[-`a-z]\\|..+\\)?:\\|" ; colon except after drive
"[+, ;=|<>\"?*]\\|\\[\\|\\]\\|" ; invalid characters
"[\000-\037]\\|" ; control characters
"\\(/\\.\\.?[^/]\\)\\|" ; leading dots
"\\(/[^/.]+\\.[^/.]*\\.\\)"))) ; more than a single dot
((memq system-type '(ms-dos windows-nt cygwin))
(purecopy
(concat "^\\([^A-Z[-`a-z]\\|..+\\)?:\\|" ; colon except after drive
"[|<>\"?*\000-\037]"))) ; invalid characters
(t (purecopy "[\000]")))
"Regexp recognizing file names which aren't allowed by the filesystem.")
(defcustom file-precious-flag nil
"Non-nil means protect against I/O errors while saving files.
Some modes set this non-nil in particular buffers.
This feature works by writing the new contents into a temporary file
and then renaming the temporary file to replace the original.
In this way, any I/O error in writing leaves the original untouched,
and there is never any instant where the file is nonexistent.
Note that this feature forces backups to be made by copying.
Yet, at the same time, saving a precious file
breaks any hard links between it and other files.
This feature is advisory: for example, if the directory in which the
file is being saved is not writable, Emacs may ignore a non-nil value
of `file-precious-flag' and write directly into the file.
See also: `break-hardlink-on-save'."
:type 'boolean
:group 'backup)
(defcustom break-hardlink-on-save nil
"Non-nil means when saving a file that exists under several names
\(i.e., has multiple hardlinks), break the hardlink associated with
`buffer-file-name' and write to a new file, so that the other
instances of the file are not affected by the save.
If `buffer-file-name' refers to a symlink, do not break the symlink.
Unlike `file-precious-flag', `break-hardlink-on-save' is not advisory.
For example, if the directory in which a file is being saved is not
itself writable, then error instead of saving in some
hardlink-nonbreaking way.
See also `backup-by-copying' and `backup-by-copying-when-linked'."
:type 'boolean
:group 'files
:version "23.1")
(defcustom version-control nil
"Control use of version numbers for backup files.
When t, make numeric backup versions unconditionally.
When nil, make them for files that have some already.
The value `never' means do not make them."
:type '(choice (const :tag "Never" never)
(const :tag "If existing" nil)
(other :tag "Always" t))
:group 'backup
:group 'vc)
(put 'version-control 'safe-local-variable
'(lambda (x) (or (booleanp x) (equal x 'never))))
(defcustom dired-kept-versions 2
"When cleaning directory, number of versions to keep."
:type 'integer
:group 'backup
:group 'dired)
(defcustom delete-old-versions nil
"If t, delete excess backup versions silently.
If nil, ask confirmation. Any other value prevents any trimming."
:type '(choice (const :tag "Delete" t)
(const :tag "Ask" nil)
(other :tag "Leave" other))
:group 'backup)
(defcustom kept-old-versions 2
"Number of oldest versions to keep when a new numbered backup is made."
:type 'integer
:group 'backup)
(put 'kept-old-versions 'safe-local-variable 'integerp)
(defcustom kept-new-versions 2
"Number of newest versions to keep when a new numbered backup is made.
Includes the new backup. Must be > 0"
:type 'integer
:group 'backup)
(put 'kept-new-versions 'safe-local-variable 'integerp)
(defcustom require-final-newline nil
"Whether to add a newline automatically at the end of the file.
A value of t means do this only when the file is about to be saved.
A value of `visit' means do this right after the file is visited.
A value of `visit-save' means do it at both of those times.
Any other non-nil value means ask user whether to add a newline, when saving.
A value of nil means don't add newlines.
Certain major modes set this locally to the value obtained
from `mode-require-final-newline'."
:type '(choice (const :tag "When visiting" visit)
(const :tag "When saving" t)
(const :tag "When visiting or saving" visit-save)
(const :tag "Don't add newlines" nil)
(other :tag "Ask each time" ask))
:group 'editing-basics)
(defcustom mode-require-final-newline t
"Whether to add a newline at end of file, in certain major modes.
Those modes set `require-final-newline' to this value when you enable them.
They do so because they are often used for files that are supposed
to end in newlines, and the question is how to arrange that.
A value of t means do this only when the file is about to be saved.
A value of `visit' means do this right after the file is visited.
A value of `visit-save' means do it at both of those times.
Any other non-nil value means ask user whether to add a newline, when saving.
A value of nil means do not add newlines. That is a risky choice in this
variable since this value is used for modes for files that ought to have
final newlines. So if you set this to nil, you must explicitly check and
add a final newline, whenever you save a file that really needs one."
:type '(choice (const :tag "When visiting" visit)
(const :tag "When saving" t)
(const :tag "When visiting or saving" visit-save)
(const :tag "Don't add newlines" nil)
(other :tag "Ask each time" ask))
:group 'editing-basics
:version "22.1")
(defcustom auto-save-default t
"Non-nil says by default do auto-saving of every file-visiting buffer."
:type 'boolean
:group 'auto-save)
(defcustom auto-save-file-name-transforms
`(("\\`/[^/]*:\\([^/]*/\\)*\\([^/]*\\)\\'"
;; Don't put "\\2" inside expand-file-name, since it will be
;; transformed to "/2" on DOS/Windows.
,(concat temporary-file-directory "\\2") t))
"Transforms to apply to buffer file name before making auto-save file name.
Each transform is a list (REGEXP REPLACEMENT UNIQUIFY):
REGEXP is a regular expression to match against the file name.
If it matches, `replace-match' is used to replace the
matching part with REPLACEMENT.
If the optional element UNIQUIFY is non-nil, the auto-save file name is
constructed by taking the directory part of the replaced file-name,
concatenated with the buffer file name with all directory separators
changed to `!' to prevent clashes. This will not work
correctly if your filesystem truncates the resulting name.
All the transforms in the list are tried, in the order they are listed.
When one transform applies, its result is final;
no further transforms are tried.
The default value is set up to put the auto-save file into the
temporary directory (see the variable `temporary-file-directory') for
editing a remote file.
On MS-DOS filesystems without long names this variable is always
ignored."
:group 'auto-save
:type '(repeat (list (string :tag "Regexp") (string :tag "Replacement")
(boolean :tag "Uniquify")))
:initialize 'custom-initialize-delay
:version "21.1")
(defcustom save-abbrevs t
"Non-nil means save word abbrevs too when files are saved.
If `silently', don't ask the user before saving."
:type '(choice (const t) (const nil) (const silently))
:group 'abbrev)
(defcustom find-file-run-dired t
"Non-nil means allow `find-file' to visit directories.
To visit the directory, `find-file' runs `find-directory-functions'."
:type 'boolean
:group 'find-file)
(defcustom find-directory-functions '(cvs-dired-noselect dired-noselect)
"List of functions to try in sequence to visit a directory.
Each function is called with the directory name as the sole argument
and should return either a buffer or nil."
:type '(hook :options (cvs-dired-noselect dired-noselect))
:group 'find-file)
;; FIXME: also add a hook for `(thing-at-point 'filename)'
(defcustom file-name-at-point-functions '(ffap-guess-file-name-at-point)
"List of functions to try in sequence to get a file name at point.
Each function should return either nil or a file name found at the
location of point in the current buffer."
:type '(hook :options (ffap-guess-file-name-at-point))
:group 'find-file)
;;;It is not useful to make this a local variable.
;;;(put 'find-file-not-found-hooks 'permanent-local t)
(defvar find-file-not-found-functions nil
"List of functions to be called for `find-file' on nonexistent file.
These functions are called as soon as the error is detected.
Variable `buffer-file-name' is already set up.
The functions are called in the order given until one of them returns non-nil.")
(define-obsolete-variable-alias 'find-file-not-found-hooks
'find-file-not-found-functions "22.1")
;;;It is not useful to make this a local variable.
;;;(put 'find-file-hooks 'permanent-local t)
(define-obsolete-variable-alias 'find-file-hooks 'find-file-hook "22.1")
(defcustom find-file-hook nil
"List of functions to be called after a buffer is loaded from a file.
The buffer's local variables (if any) will have been processed before the
functions are called."
:group 'find-file
:type 'hook
:options '(auto-insert)
:version "22.1")
(defvar write-file-functions nil
"List of functions to be called before writing out a buffer to a file.
If one of them returns non-nil, the file is considered already written
and the rest are not called.
These hooks are considered to pertain to the visited file.
So any buffer-local binding of this variable is discarded if you change
the visited file name with \\[set-visited-file-name], but not when you
change the major mode.
This hook is not run if any of the functions in
`write-contents-functions' returns non-nil. Both hooks pertain
to how to save a buffer to file, for instance, choosing a suitable
coding system and setting mode bits. (See Info
node `(elisp)Saving Buffers'.) To perform various checks or
updates before the buffer is saved, use `before-save-hook'.")
(put 'write-file-functions 'permanent-local t)
(define-obsolete-variable-alias 'write-file-hooks 'write-file-functions "22.1")
(defvar local-write-file-hooks nil)
(make-variable-buffer-local 'local-write-file-hooks)
(put 'local-write-file-hooks 'permanent-local t)
(make-obsolete-variable 'local-write-file-hooks 'write-file-functions "22.1")
(defvar write-contents-functions nil
"List of functions to be called before writing out a buffer to a file.
If one of them returns non-nil, the file is considered already written
and the rest are not called and neither are the functions in
`write-file-functions'.
This variable is meant to be used for hooks that pertain to the
buffer's contents, not to the particular visited file; thus,
`set-visited-file-name' does not clear this variable; but changing the
major mode does clear it.
For hooks that _do_ pertain to the particular visited file, use
`write-file-functions'. Both this variable and
`write-file-functions' relate to how a buffer is saved to file.
To perform various checks or updates before the buffer is saved,
use `before-save-hook'.")
(make-variable-buffer-local 'write-contents-functions)
(define-obsolete-variable-alias 'write-contents-hooks
'write-contents-functions "22.1")
(defcustom enable-local-variables t
"Control use of local variables in files you visit.
The value can be t, nil, :safe, :all, or something else.
A value of t means file local variables specifications are obeyed
if all the specified variable values are safe; if any values are
not safe, Emacs queries you, once, whether to set them all.
\(When you say yes to certain values, they are remembered as safe.)
:safe means set the safe variables, and ignore the rest.
:all means set all variables, whether safe or not.
(Don't set it permanently to :all.)
A value of nil means always ignore the file local variables.
Any other value means always query you once whether to set them all.
\(When you say yes to certain values, they are remembered as safe, but
this has no effect when `enable-local-variables' is \"something else\".)
This variable also controls use of major modes specified in
a -*- line.
The command \\[normal-mode], when used interactively,
always obeys file local variable specifications and the -*- line,
and ignores this variable."
:risky t
:type '(choice (const :tag "Query Unsafe" t)
(const :tag "Safe Only" :safe)
(const :tag "Do all" :all)
(const :tag "Ignore" nil)
(other :tag "Query" other))
:group 'find-file)
(defvar local-enable-local-variables t
"Like `enable-local-variables' but meant for buffer-local bindings.
The meaningful values are nil and non-nil. The default is non-nil.
If a major mode sets this to nil, buffer-locally, then any local
variables list in the file will be ignored.
This variable does not affect the use of major modes
specified in a -*- line.")
(defcustom enable-local-eval 'maybe
"Control processing of the \"variable\" `eval' in a file's local variables.
The value can be t, nil or something else.
A value of t means obey `eval' variables.
A value of nil means ignore them; anything else means query."
:risky t
:type '(choice (const :tag "Obey" t)
(const :tag "Ignore" nil)
(other :tag "Query" other))
:group 'find-file)
;; Avoid losing in versions where CLASH_DETECTION is disabled.
(or (fboundp 'lock-buffer)
(defalias 'lock-buffer 'ignore))
(or (fboundp 'unlock-buffer)
(defalias 'unlock-buffer 'ignore))
(or (fboundp 'file-locked-p)
(defalias 'file-locked-p 'ignore))
(defcustom view-read-only nil
"Non-nil means buffers visiting files read-only do so in view mode.
In fact, this means that all read-only buffers normally have
View mode enabled, including buffers that are read-only because
you visit a file you cannot alter, and buffers you make read-only
using \\[toggle-read-only]."
:type 'boolean
:group 'view)
(defvar file-name-history nil
"History list of file names entered in the minibuffer.
Maximum length of the history list is determined by the value
of `history-length', which see.")
(put 'ange-ftp-completion-hook-function 'safe-magic t)
(defun ange-ftp-completion-hook-function (op &rest args)
"Provides support for ange-ftp host name completion.
Runs the usual ange-ftp hook, but only for completion operations."
;; Having this here avoids the need to load ange-ftp when it's not
;; really in use.
(if (memq op '(file-name-completion file-name-all-completions))
(apply 'ange-ftp-hook-function op args)
(let ((inhibit-file-name-handlers
(cons 'ange-ftp-completion-hook-function
(and (eq inhibit-file-name-operation op)
inhibit-file-name-handlers)))
(inhibit-file-name-operation op))
(apply op args))))
(defun convert-standard-filename (filename)
"Convert a standard file's name to something suitable for the OS.
This means to guarantee valid names and perhaps to canonicalize
certain patterns.
FILENAME should be an absolute file name since the conversion rules
sometimes vary depending on the position in the file name. E.g. c:/foo
is a valid DOS file name, but c:/bar/c:/foo is not.
This function's standard definition is trivial; it just returns
the argument. However, on Windows and DOS, replace invalid
characters. On DOS, make sure to obey the 8.3 limitations.
In the native Windows build, turn Cygwin names into native names,
and also turn slashes into backslashes if the shell requires it (see
`w32-shell-dos-semantics').
See Info node `(elisp)Standard File Names' for more details."
(if (eq system-type 'cygwin)
(let ((name (copy-sequence filename))
(start 0))
;; Replace invalid filename characters with !
(while (string-match "[?*:<>|\"\000-\037]" name start)
(aset name (match-beginning 0) ?!)
(setq start (match-end 0)))
name)
filename))
(defun read-directory-name (prompt &optional dir default-dirname mustmatch initial)
"Read directory name, prompting with PROMPT and completing in directory DIR.
Value is not expanded---you must call `expand-file-name' yourself.
Default name to DEFAULT-DIRNAME if user exits with the same
non-empty string that was inserted by this function.
(If DEFAULT-DIRNAME is omitted, DIR combined with INITIAL is used,
or just DIR if INITIAL is nil.)
If the user exits with an empty minibuffer, this function returns
an empty string. (This can only happen if the user erased the
pre-inserted contents or if `insert-default-directory' is nil.)
Fourth arg MUSTMATCH non-nil means require existing directory's name.
Non-nil and non-t means also require confirmation after completion.
Fifth arg INITIAL specifies text to start with.
DIR should be an absolute directory name. It defaults to
the value of `default-directory'."
(unless dir
(setq dir default-directory))
(read-file-name prompt dir (or default-dirname
(if initial (expand-file-name initial dir)
dir))
mustmatch initial
'file-directory-p))
(defun pwd ()
"Show the current default directory."
(interactive nil)
(message "Directory %s" default-directory))
(defvar cd-path nil
"Value of the CDPATH environment variable, as a list.
Not actually set up until the first time you use it.")
(defun parse-colon-path (cd-path)
"Explode a search path into a list of directory names.
Directories are separated by occurrences of `path-separator'
\(which is colon in GNU and GNU-like systems)."
;; We could use split-string here.
(and cd-path
(let (cd-list (cd-start 0) cd-colon)
(setq cd-path (concat cd-path path-separator))
(while (setq cd-colon (string-match path-separator cd-path cd-start))
(setq cd-list
(nconc cd-list
(list (if (= cd-start cd-colon)
nil
(substitute-in-file-name
(file-name-as-directory
(substring cd-path cd-start cd-colon)))))))
(setq cd-start (+ cd-colon 1)))
cd-list)))
(defun cd-absolute (dir)
"Change current directory to given absolute file name DIR."
;; Put the name into directory syntax now,
;; because otherwise expand-file-name may give some bad results.
(setq dir (file-name-as-directory dir))
;; We used to additionally call abbreviate-file-name here, for an
;; unknown reason. Problem is that most buffers are setup
;; without going through cd-absolute and don't call
;; abbreviate-file-name on their default-directory, so the few that
;; do end up using a superficially different directory.
(setq dir (expand-file-name dir))
(if (not (file-directory-p dir))
(if (file-exists-p dir)
(error "%s is not a directory" dir)
(error "%s: no such directory" dir))
(unless (file-executable-p dir)
(error "Cannot cd to %s: Permission denied" dir))
(setq default-directory dir)
(setq list-buffers-directory dir)))
(defun cd (dir)
"Make DIR become the current buffer's default directory.
If your environment includes a `CDPATH' variable, try each one of
that list of directories (separated by occurrences of
`path-separator') when resolving a relative directory name.
The path separator is colon in GNU and GNU-like systems."
(interactive
(list (read-directory-name "Change default directory: "
default-directory default-directory
(and (member cd-path '(nil ("./")))
(null (getenv "CDPATH"))))))
(if (file-name-absolute-p dir)
(cd-absolute (expand-file-name dir))
(if (null cd-path)
(let ((trypath (parse-colon-path (getenv "CDPATH"))))
(setq cd-path (or trypath (list "./")))))
(if (not (catch 'found
(mapc
(function (lambda (x)
(let ((f (expand-file-name (concat x dir))))
(if (file-directory-p f)
(progn
(cd-absolute f)
(throw 'found t))))))
cd-path)
nil))
(error "No such directory found via CDPATH environment variable"))))
(defun load-file (file)
"Load the Lisp file named FILE."
;; This is a case where .elc makes a lot of sense.
(interactive (list (let ((completion-ignored-extensions
(remove ".elc" completion-ignored-extensions)))
(read-file-name "Load file: "))))
(load (expand-file-name file) nil nil t))
(defun locate-file (filename path &optional suffixes predicate)
"Search for FILENAME through PATH.
If found, return the absolute file name of FILENAME, with its suffixes;
otherwise return nil.
PATH should be a list of directories to look in, like the lists in
`exec-path' or `load-path'.
If SUFFIXES is non-nil, it should be a list of suffixes to append to
file name when searching. If SUFFIXES is nil, it is equivalent to '(\"\").
Use '(\"/\") to disable PATH search, but still try the suffixes in SUFFIXES.
If non-nil, PREDICATE is used instead of `file-readable-p'.
PREDICATE can also be an integer to pass to the `access' system call,
in which case file-name handlers are ignored. This usage is deprecated.
For compatibility, PREDICATE can also be one of the symbols
`executable', `readable', `writable', or `exists', or a list of
one or more of those symbols."
(if (and predicate (symbolp predicate) (not (functionp predicate)))
(setq predicate (list predicate)))
(when (and (consp predicate) (not (functionp predicate)))
(setq predicate
(logior (if (memq 'executable predicate) 1 0)
(if (memq 'writable predicate) 2 0)
(if (memq 'readable predicate) 4 0))))
(locate-file-internal filename path suffixes predicate))
(defun locate-file-completion-table (dirs suffixes string pred action)
"Do completion for file names passed to `locate-file'."
(cond
((file-name-absolute-p string)
;; FIXME: maybe we should use completion-file-name-table instead,
;; tho at least for `load', the arg is passed through
;; substitute-in-file-name for historical reasons.
(read-file-name-internal string pred action))
((eq (car-safe action) 'boundaries)
(let ((suffix (cdr action)))
(list* 'boundaries
(length (file-name-directory string))
(let ((x (file-name-directory suffix)))
(if x (1- (length x)) (length suffix))))))
(t
(let ((names nil)
(suffix (concat (regexp-opt suffixes t) "\\'"))
(string-dir (file-name-directory string))
(string-file (file-name-nondirectory string)))
(dolist (dir dirs)
(unless dir
(setq dir default-directory))
(if string-dir (setq dir (expand-file-name string-dir dir)))
(when (file-directory-p dir)
(dolist (file (file-name-all-completions
string-file dir))
(push file names)
(when (string-match suffix file)
(setq file (substring file 0 (match-beginning 0)))
(push file names)))))
(completion-table-with-context
string-dir names string-file pred action)))))
(defun locate-file-completion (string path-and-suffixes action)
"Do completion for file names passed to `locate-file'.
PATH-AND-SUFFIXES is a pair of lists, (DIRECTORIES . SUFFIXES)."
(locate-file-completion-table (car path-and-suffixes)
(cdr path-and-suffixes)
string nil action))
(make-obsolete 'locate-file-completion 'locate-file-completion-table "23.1")
(defvar locate-dominating-stop-dir-regexp
(purecopy "\\`\\(?:[\\/][\\/][^\\/]+[\\/]\\|/\\(?:net\\|afs\\|\\.\\.\\.\\)/\\)\\'")
"Regexp of directory names which stop the search in `locate-dominating-file'.
Any directory whose name matches this regexp will be treated like
a kind of root directory by `locate-dominating-file' which will stop its search
when it bumps into it.
The default regexp prevents fruitless and time-consuming attempts to find
special files in directories in which filenames are interpreted as hostnames,
or mount points potentially requiring authentication as a different user.")
;; (defun locate-dominating-files (file regexp)
;; "Look up the directory hierarchy from FILE for a file matching REGEXP.
;; Stop at the first parent where a matching file is found and return the list
;; of files that that match in this directory."
;; (catch 'found
;; ;; `user' is not initialized yet because `file' may not exist, so we may
;; ;; have to walk up part of the hierarchy before we find the "initial UID".
;; (let ((user nil)
;; ;; Abbreviate, so as to stop when we cross ~/.
;; (dir (abbreviate-file-name (file-name-as-directory file)))
;; files)
;; (while (and dir
;; ;; As a heuristic, we stop looking up the hierarchy of
;; ;; directories as soon as we find a directory belonging to
;; ;; another user. This should save us from looking in
;; ;; things like /net and /afs. This assumes that all the
;; ;; files inside a project belong to the same user.
;; (let ((prev-user user))
;; (setq user (nth 2 (file-attributes dir)))
;; (or (null prev-user) (equal user prev-user))))
;; (if (setq files (condition-case nil
;; (directory-files dir 'full regexp 'nosort)
;; (error nil)))
;; (throw 'found files)
;; (if (equal dir
;; (setq dir (file-name-directory
;; (directory-file-name dir))))
;; (setq dir nil))))
;; nil)))
(defun locate-dominating-file (file name)
"Look up the directory hierarchy from FILE for a file named NAME.
Stop at the first parent directory containing a file NAME,
and return the directory. Return nil if not found."
;; We used to use the above locate-dominating-files code, but the
;; directory-files call is very costly, so we're much better off doing
;; multiple calls using the code in here.
;;
;; Represent /home/luser/foo as ~/foo so that we don't try to look for
;; `name' in /home or in /.
(setq file (abbreviate-file-name file))
(let ((root nil)
(prev-file file)
;; `user' is not initialized outside the loop because
;; `file' may not exist, so we may have to walk up part of the
;; hierarchy before we find the "initial UID".
(user nil)
try)
(while (not (or root
(null file)
;; FIXME: Disabled this heuristic because it is sometimes
;; inappropriate.
;; As a heuristic, we stop looking up the hierarchy of
;; directories as soon as we find a directory belonging
;; to another user. This should save us from looking in
;; things like /net and /afs. This assumes that all the
;; files inside a project belong to the same user.
;; (let ((prev-user user))
;; (setq user (nth 2 (file-attributes file)))
;; (and prev-user (not (equal user prev-user))))
(string-match locate-dominating-stop-dir-regexp file)))
(setq try (file-exists-p (expand-file-name name file)))
(cond (try (setq root file))
((equal file (setq prev-file file
file (file-name-directory
(directory-file-name file))))
(setq file nil))))
root))
(defun executable-find (command)
"Search for COMMAND in `exec-path' and return the absolute file name.
Return nil if COMMAND is not found anywhere in `exec-path'."
;; Use 1 rather than file-executable-p to better match the behavior of
;; call-process.
(locate-file command exec-path exec-suffixes 1))
(defun load-library (library)
"Load the Emacs Lisp library named LIBRARY.
This is an interface to the function `load'. LIBRARY is searched
for in `load-path', both with and without `load-suffixes' (as
well as `load-file-rep-suffixes').
See Info node `(emacs)Lisp Libraries' for more details.
See `load-file' for a different interface to `load'."
(interactive
(list (completing-read "Load library: "
(apply-partially 'locate-file-completion-table
load-path
(get-load-suffixes)))))
(load library))
(defun file-remote-p (file &optional identification connected)
"Test whether FILE specifies a location on a remote system.
Returns nil or a string identifying the remote connection (ideally
a prefix of FILE). For example, the remote identification for filename
\"/user@host:/foo\" could be \"/user@host:\".
A file is considered \"remote\" if accessing it is likely to be slower or
less reliable than accessing local files.
Furthermore, relative file names do not work across remote connections.
IDENTIFICATION specifies which part of the identification shall
be returned as string. IDENTIFICATION can be the symbol
`method', `user', `host' or `localname'; any other value is
handled like nil and means to return the complete identification
string.
If CONNECTED is non-nil, the function returns an identification only
if FILE is located on a remote system, and a connection is established
to that remote system.
`file-remote-p' will never open a connection on its own."
(let ((handler (find-file-name-handler file 'file-remote-p)))
(if handler
(funcall handler 'file-remote-p file identification connected)
nil)))
(defun file-local-copy (file)
"Copy the file FILE into a temporary file on this machine.
Returns the name of the local copy, or nil, if FILE is directly
accessible."
;; This formerly had an optional BUFFER argument that wasn't used by
;; anything.
(let ((handler (find-file-name-handler file 'file-local-copy)))
(if handler
(funcall handler 'file-local-copy file)
nil)))
(defun file-truename (filename &optional counter prev-dirs)
"Return the truename of FILENAME, which should be absolute.
The truename of a file name is found by chasing symbolic links
both at the level of the file and at the level of the directories
containing it, until no links are left at any level.
\(fn FILENAME)" ;; Don't document the optional arguments.
;; COUNTER and PREV-DIRS are only used in recursive calls.
;; COUNTER can be a cons cell whose car is the count of how many
;; more links to chase before getting an error.
;; PREV-DIRS can be a cons cell whose car is an alist
;; of truenames we've just recently computed.
(cond ((or (string= filename "") (string= filename "~"))
(setq filename (expand-file-name filename))
(if (string= filename "")
(setq filename "/")))
((and (string= (substring filename 0 1) "~")
(string-match "~[^/]*/?" filename))
(let ((first-part
(substring filename 0 (match-end 0)))
(rest (substring filename (match-end 0))))
(setq filename (concat (expand-file-name first-part) rest)))))
(or counter (setq counter (list 100)))
(let (done
;; For speed, remove the ange-ftp completion handler from the list.
;; We know it's not needed here.
;; For even more speed, do this only on the outermost call.
(file-name-handler-alist
(if prev-dirs file-name-handler-alist
(let ((tem (copy-sequence file-name-handler-alist)))
(delq (rassq 'ange-ftp-completion-hook-function tem) tem)))))
(or prev-dirs (setq prev-dirs (list nil)))
;; andrewi@harlequin.co.uk - none of the following code (except for
;; invoking the file-name handler) currently applies on Windows
;; (ie. there are no native symlinks), but there is an issue with
;; case differences being ignored by the OS, and short "8.3 DOS"
;; name aliases existing for all files. (The short names are not
;; reported by directory-files, but can be used to refer to files.)
;; It seems appropriate for file-truename to resolve these issues in
;; the most natural way, which on Windows is to call the function
;; `w32-long-file-name' - this returns the exact name of a file as
;; it is stored on disk (expanding short name aliases with the full
;; name in the process).
(if (eq system-type 'windows-nt)
(let ((handler (find-file-name-handler filename 'file-truename)))
;; For file name that has a special handler, call handler.
;; This is so that ange-ftp can save time by doing a no-op.
(if handler
(setq filename (funcall handler 'file-truename filename))
;; If filename contains a wildcard, newname will be the old name.
(unless (string-match "[[*?]" filename)
;; If filename exists, use the long name. If it doesn't exist,
;; drill down until we find a directory that exists, and use
;; the long name of that, with the extra non-existent path
;; components concatenated.
(let ((longname (w32-long-file-name filename))
missing rest)
(if longname
(setq filename longname)
;; Include the preceding directory separator in the missing
;; part so subsequent recursion on the rest works.
(setq missing (concat "/" (file-name-nondirectory filename)))
(let ((length (length missing)))
(setq rest
(if (> length (length filename))
""
(substring filename 0 (- length)))))
(setq filename (concat (file-truename rest) missing))))))
(setq done t)))
;; If this file directly leads to a link, process that iteratively
;; so that we don't use lots of stack.
(while (not done)
(setcar counter (1- (car counter)))
(if (< (car counter) 0)
(error "Apparent cycle of symbolic links for %s" filename))
(let ((handler (find-file-name-handler filename 'file-truename)))
;; For file name that has a special handler, call handler.
;; This is so that ange-ftp can save time by doing a no-op.
(if handler
(setq filename (funcall handler 'file-truename filename)
done t)
(let ((dir (or (file-name-directory filename) default-directory))
target dirfile)
;; Get the truename of the directory.
(setq dirfile (directory-file-name dir))
;; If these are equal, we have the (or a) root directory.
(or (string= dir dirfile)
;; If this is the same dir we last got the truename for,
;; save time--don't recalculate.
(if (assoc dir (car prev-dirs))
(setq dir (cdr (assoc dir (car prev-dirs))))
(let ((old dir)
(new (file-name-as-directory (file-truename dirfile counter prev-dirs))))
(setcar prev-dirs (cons (cons old new) (car prev-dirs)))
(setq dir new))))
(if (equal ".." (file-name-nondirectory filename))
(setq filename
(directory-file-name (file-name-directory (directory-file-name dir)))
done t)
(if (equal "." (file-name-nondirectory filename))
(setq filename (directory-file-name dir)
done t)
;; Put it back on the file name.
(setq filename (concat dir (file-name-nondirectory filename)))
;; Is the file name the name of a link?
(setq target (file-symlink-p filename))
(if target
;; Yes => chase that link, then start all over
;; since the link may point to a directory name that uses links.
;; We can't safely use expand-file-name here
;; since target might look like foo/../bar where foo
;; is itself a link. Instead, we handle . and .. above.
(setq filename
(if (file-name-absolute-p target)
target
(concat dir target))
done nil)
;; No, we are done!
(setq done t))))))))
filename))
(defun file-chase-links (filename &optional limit)
"Chase links in FILENAME until a name that is not a link.
Unlike `file-truename', this does not check whether a parent
directory name is a symbolic link.
If the optional argument LIMIT is a number,
it means chase no more than that many links and then stop."
(let (tem (newname filename)
(count 0))
(while (and (or (null limit) (< count limit))
(setq tem (file-symlink-p newname)))
(save-match-data
(if (and (null limit) (= count 100))
(error "Apparent cycle of symbolic links for %s" filename))
;; In the context of a link, `//' doesn't mean what Emacs thinks.
(while (string-match "//+" tem)
(setq tem (replace-match "/" nil nil tem)))
;; Handle `..' by hand, since it needs to work in the
;; target of any directory symlink.
;; This code is not quite complete; it does not handle
;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
(while (string-match "\\`\\.\\./" tem)
(setq tem (substring tem 3))
(setq newname (expand-file-name newname))
;; Chase links in the default dir of the symlink.
(setq newname
(file-chase-links
(directory-file-name (file-name-directory newname))))
;; Now find the parent of that dir.
(setq newname (file-name-directory newname)))
(setq newname (expand-file-name tem (file-name-directory newname)))
(setq count (1+ count))))
newname))
(defun make-temp-file (prefix &optional dir-flag suffix)
"Create a temporary file.
The returned file name (created by appending some random characters at the end
of PREFIX, and expanding against `temporary-file-directory' if necessary),
is guaranteed to point to a newly created empty file.
You can then use `write-region' to write new data into the file.
If DIR-FLAG is non-nil, create a new empty directory instead of a file.
If SUFFIX is non-nil, add that at the end of the file name."
(let ((umask (default-file-modes))
file)
(unwind-protect
(progn
;; Create temp files with strict access rights. It's easy to
;; loosen them later, whereas it's impossible to close the
;; time-window of loose permissions otherwise.
(set-default-file-modes ?\700)
(while (condition-case ()
(progn
(setq file
(make-temp-name
(if (zerop (length prefix))
(file-name-as-directory
temporary-file-directory)
(expand-file-name prefix
temporary-file-directory))))
(if suffix
(setq file (concat file suffix)))
(if dir-flag
(make-directory file)
(write-region "" nil file nil 'silent nil 'excl))
nil)
(file-already-exists t))
;; the file was somehow created by someone else between
;; `make-temp-name' and `write-region', let's try again.
nil)
file)
;; Reset the umask.
(set-default-file-modes umask))))
(defun recode-file-name (file coding new-coding &optional ok-if-already-exists)
"Change the encoding of FILE's name from CODING to NEW-CODING.
The value is a new name of FILE.
Signals a `file-already-exists' error if a file of the new name
already exists unless optional fourth argument OK-IF-ALREADY-EXISTS
is non-nil. A number as fourth arg means request confirmation if
the new name already exists. This is what happens in interactive
use with M-x."
(interactive
(let ((default-coding (or file-name-coding-system
default-file-name-coding-system))
(filename (read-file-name "Recode filename: " nil nil t))
from-coding to-coding)
(if (and default-coding
;; We provide the default coding only when it seems that
;; the filename is correctly decoded by the default
;; coding.
(let ((charsets (find-charset-string filename)))
(and (not (memq 'eight-bit-control charsets))
(not (memq 'eight-bit-graphic charsets)))))
(setq from-coding (read-coding-system
(format "Recode filename %s from (default %s): "
filename default-coding)
default-coding))
(setq from-coding (read-coding-system
(format "Recode filename %s from: " filename))))
;; We provide the default coding only when a user is going to
;; change the encoding not from the default coding.
(if (eq from-coding default-coding)
(setq to-coding (read-coding-system
(format "Recode filename %s from %s to: "
filename from-coding)))
(setq to-coding (read-coding-system
(format "Recode filename %s from %s to (default %s): "
filename from-coding default-coding)
default-coding)))
(list filename from-coding to-coding)))
(let* ((default-coding (or file-name-coding-system
default-file-name-coding-system))
;; FILE should have been decoded by DEFAULT-CODING.
(encoded (encode-coding-string file default-coding))
(newname (decode-coding-string encoded coding))
(new-encoded (encode-coding-string newname new-coding))
;; Suppress further encoding.
(file-name-coding-system nil)
(default-file-name-coding-system nil)
(locale-coding-system nil))
(rename-file encoded new-encoded ok-if-already-exists)
newname))
(defun forward-filename (arg)
"Move point forward arg filenames (backward if arg is negative)."
(interactive "p")
(if (< arg 0)
(progn
(backward-char)
(while (< arg 0)
(re-search-backward "[/\n]" nil t)
(setq arg (1+ arg)))
(forward-char))
(forward-char)
(while (> arg 0)
(re-search-forward "[/\n]" nil t)
(setq arg (1- arg)))
(backward-char)))
(defun kill-filename (arg)
"Kill characters forward until up to the end of a filename.
With argument, do this that many times."
(interactive "p")
(kill-region (point) (progn (forward-filename arg) (point))))
(defun backward-kill-filename (arg)
"Kill characters backward up to the beginning of a filename.
With argument, do this that many times."
(interactive "p")
(kill-filename (- arg)))
(define-key minibuffer-local-filename-completion-map
[remap backward-kill-word] 'backward-kill-filename)
(defcustom confirm-nonexistent-file-or-buffer 'after-completion
"Whether confirmation is requested before visiting a new file or buffer.
If nil, confirmation is not requested.
If the value is `after-completion', confirmation is only
requested if the user called `minibuffer-complete' right before
`minibuffer-complete-and-exit'.
Any other non-nil value means to request confirmation.
This affects commands like `switch-to-buffer' and `find-file'."
:group 'find-file
:version "23.1"
:type '(choice (const :tag "After completion" after-completion)
(const :tag "Never" nil)
(other :tag "Always" t)))
(defun confirm-nonexistent-file-or-buffer ()
"Whether to request confirmation before visiting a new file or buffer.
The variable `confirm-nonexistent-file-or-buffer' determines the
return value, which may be passed as the REQUIRE-MATCH arg to
`read-buffer' or `find-file-read-args'."
(cond ((eq confirm-nonexistent-file-or-buffer 'after-completion)
'confirm-after-completion)
(confirm-nonexistent-file-or-buffer
'confirm)
(t nil)))
(defun read-buffer-to-switch (prompt)
"Read the name of a buffer to switch to and return as a string.
It is intended for `switch-to-buffer' family of commands since they
need to omit the name of current buffer from the list of completions
and default values."
(let ((rbts-completion-table (internal-complete-buffer-except)))
(minibuffer-with-setup-hook
(lambda ()
(setq minibuffer-completion-table rbts-completion-table)
;; Since rbts-completion-table is built dynamically, we
;; can't just add it to the default value of
;; icomplete-with-completion-tables, so we add it
;; here manually.
(if (and (boundp 'icomplete-with-completion-tables)
(listp icomplete-with-completion-tables))
(set (make-local-variable 'icomplete-with-completion-tables)
(cons rbts-completion-table
icomplete-with-completion-tables))))
(read-buffer prompt (other-buffer (current-buffer))
(confirm-nonexistent-file-or-buffer)))))
(defun switch-to-buffer-other-window (buffer-or-name &optional norecord)
"Select the buffer specified by BUFFER-OR-NAME in another window.
BUFFER-OR-NAME may be a buffer, a string \(a buffer name), or
nil. Return the buffer switched to.
If called interactively, prompt for the buffer name using the
minibuffer. The variable `confirm-nonexistent-file-or-buffer'
determines whether to request confirmation before creating a new
buffer.
If BUFFER-OR-NAME is a string and does not identify an existing
buffer, create a new buffer with that name. If BUFFER-OR-NAME is
nil, switch to the buffer returned by `other-buffer'.
Optional second argument NORECORD non-nil means do not put this
buffer at the front of the list of recently selected ones.
This uses the function `display-buffer' as a subroutine; see its
documentation for additional customization information."
(interactive
(list (read-buffer-to-switch "Switch to buffer in other window: ")))
(let ((pop-up-windows t)
same-window-buffer-names same-window-regexps)
(pop-to-buffer buffer-or-name t norecord)))
(defun switch-to-buffer-other-frame (buffer-or-name &optional norecord)
"Switch to buffer BUFFER-OR-NAME in another frame.
BUFFER-OR-NAME may be a buffer, a string \(a buffer name), or
nil. Return the buffer switched to.
If called interactively, prompt for the buffer name using the
minibuffer. The variable `confirm-nonexistent-file-or-buffer'
determines whether to request confirmation before creating a new
buffer.
If BUFFER-OR-NAME is a string and does not identify an existing
buffer, create a new buffer with that name. If BUFFER-OR-NAME is
nil, switch to the buffer returned by `other-buffer'.
Optional second arg NORECORD non-nil means do not put this
buffer at the front of the list of recently selected ones.
This uses the function `display-buffer' as a subroutine; see its
documentation for additional customization information."
(interactive
(list (read-buffer-to-switch "Switch to buffer in other frame: ")))
(let ((pop-up-frames t)
same-window-buffer-names same-window-regexps)
(pop-to-buffer buffer-or-name t norecord)))
(defun display-buffer-other-frame (buffer)
"Display buffer BUFFER in another frame.
This uses the function `display-buffer' as a subroutine; see
its documentation for additional customization information."
(interactive "BDisplay buffer in other frame: ")
(let ((pop-up-frames t)
same-window-buffer-names same-window-regexps
(old-window (selected-window))
new-window)
(setq new-window (display-buffer buffer t))
;; This may have been here in order to prevent the new frame from hiding
;; the old frame. But it does more harm than good.
;; Maybe we should call `raise-window' on the old-frame instead? --Stef
;;(lower-frame (window-frame new-window))
;; This may have been here in order to make sure the old-frame gets the
;; focus. But not only can it cause an annoying flicker, with some
;; window-managers it just makes the window invisible, with no easy
;; way to recover it. --Stef
;;(make-frame-invisible (window-frame old-window))
;;(make-frame-visible (window-frame old-window))
))
(defmacro minibuffer-with-setup-hook (fun &rest body)
"Temporarily add FUN to `minibuffer-setup-hook' while executing BODY.
BODY should use the minibuffer at most once.
Recursive uses of the minibuffer are unaffected (FUN is not
called additional times).
This macro actually adds an auxiliary function that calls FUN,
rather than FUN itself, to `minibuffer-setup-hook'."
(declare (indent 1) (debug t))
(let ((hook (make-symbol "setup-hook")))
`(let (,hook)
(setq ,hook
(lambda ()
;; Clear out this hook so it does not interfere
;; with any recursive minibuffer usage.
(remove-hook 'minibuffer-setup-hook ,hook)
(funcall ,fun)))
(unwind-protect
(progn
(add-hook 'minibuffer-setup-hook ,hook)
,@body)
(remove-hook 'minibuffer-setup-hook ,hook)))))
(defun find-file-read-args (prompt mustmatch)
(list (read-file-name prompt nil default-directory mustmatch)
t))
(defun find-file (filename &optional wildcards)
"Edit file FILENAME.
Switch to a buffer visiting file FILENAME,
creating one if none already exists.
Interactively, the default if you just type RET is the current directory,
but the visited file name is available through the minibuffer history:
type M-n to pull it into the minibuffer.
You can visit files on remote machines by specifying something
like /ssh:SOME_REMOTE_MACHINE:FILE for the file name. You can
also visit local files as a different user by specifying
/sudo::FILE for the file name.
See the Info node `(tramp)Filename Syntax' in the Tramp Info
manual, for more about this.
Interactively, or if WILDCARDS is non-nil in a call from Lisp,
expand wildcards (if any) and visit multiple files. You can
suppress wildcard expansion by setting `find-file-wildcards' to nil.
To visit a file without any kind of conversion and without
automatically choosing a major mode, use \\[find-file-literally]."
(interactive
(find-file-read-args "Find file: "
(confirm-nonexistent-file-or-buffer)))
(let ((value (find-file-noselect filename nil nil wildcards)))
(if (listp value)
(mapcar 'switch-to-buffer (nreverse value))
(switch-to-buffer value))))
(defun find-file-other-window (filename &optional wildcards)
"Edit file FILENAME, in another window.
Like \\[find-file] (which see), but creates a new window or reuses
an existing one. See the function `display-buffer'.
Interactively, the default if you just type RET is the current directory,
but the visited file name is available through the minibuffer history:
type M-n to pull it into the minibuffer.
Interactively, or if WILDCARDS is non-nil in a call from Lisp,
expand wildcards (if any) and visit multiple files."
(interactive
(find-file-read-args "Find file in other window: "
(confirm-nonexistent-file-or-buffer)))
(let ((value (find-file-noselect filename nil nil wildcards)))
(if (listp value)
(progn
(setq value (nreverse value))
(cons (switch-to-buffer-other-window (car value))
(mapcar 'switch-to-buffer (cdr value))))
(switch-to-buffer-other-window value))))
(defun find-file-other-frame (filename &optional wildcards)
"Edit file FILENAME, in another frame.
Like \\[find-file] (which see), but creates a new frame or reuses
an existing one. See the function `display-buffer'.
Interactively, the default if you just type RET is the current directory,
but the visited file name is available through the minibuffer history:
type M-n to pull it into the minibuffer.
Interactively, or if WILDCARDS is non-nil in a call from Lisp,
expand wildcards (if any) and visit multiple files."
(interactive
(find-file-read-args "Find file in other frame: "
(confirm-nonexistent-file-or-buffer)))
(let ((value (find-file-noselect filename nil nil wildcards)))
(if (listp value)
(progn
(setq value (nreverse value))
(cons (switch-to-buffer-other-frame (car value))
(mapcar 'switch-to-buffer (cdr value))))
(switch-to-buffer-other-frame value))))
(defun find-file-existing (filename)
"Edit the existing file FILENAME.
Like \\[find-file], but only allow a file that exists, and do not allow
file names with wildcards."
(interactive (nbutlast (find-file-read-args "Find existing file: " t)))
(if (and (not (called-interactively-p 'interactive))
(not (file-exists-p filename)))
(error "%s does not exist" filename)
(find-file filename)
(current-buffer)))
(defun find-file-read-only (filename &optional wildcards)
"Edit file FILENAME but don't allow changes.
Like \\[find-file], but marks buffer as read-only.
Use \\[toggle-read-only] to permit editing."
(interactive
(find-file-read-args "Find file read-only: "
(confirm-nonexistent-file-or-buffer)))
(unless (or (and wildcards find-file-wildcards
(not (string-match "\\`/:" filename))
(string-match "[[*?]" filename))
(file-exists-p filename))
(error "%s does not exist" filename))
(let ((value (find-file filename wildcards)))
(mapc (lambda (b) (with-current-buffer b (toggle-read-only 1)))
(if (listp value) value (list value)))
value))
(defun find-file-read-only-other-window (filename &optional wildcards)
"Edit file FILENAME in another window but don't allow changes.
Like \\[find-file-other-window], but marks buffer as read-only.
Use \\[toggle-read-only] to permit editing."
(interactive
(find-file-read-args "Find file read-only other window: "
(confirm-nonexistent-file-or-buffer)))
(unless (or (and wildcards find-file-wildcards
(not (string-match "\\`/:" filename))
(string-match "[[*?]" filename))
(file-exists-p filename))
(error "%s does not exist" filename))
(let ((value (find-file-other-window filename wildcards)))
(mapc (lambda (b) (with-current-buffer b (toggle-read-only 1)))
(if (listp value) value (list value)))
value))
(defun find-file-read-only-other-frame (filename &optional wildcards)
"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
(find-file-read-args "Find file read-only other frame: "
(confirm-nonexistent-file-or-buffer)))
(unless (or (and wildcards find-file-wildcards
(not (string-match "\\`/:" filename))
(string-match "[[*?]" filename))
(file-exists-p filename))
(error "%s does not exist" filename))
(let ((value (find-file-other-frame filename wildcards)))
(mapc (lambda (b) (with-current-buffer b (toggle-read-only 1)))
(if (listp value) value (list value)))
value))
(defun find-alternate-file-other-window (filename &optional wildcards)
"Find file FILENAME as a replacement for the file in the next window.
This command does not select that window.
See \\[find-file] for the possible forms of the FILENAME argument.
Interactively, or if WILDCARDS is non-nil in a call from Lisp,
expand wildcards (if any) and replace the file with multiple files."
(interactive
(save-selected-window
(other-window 1)
(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
(confirm-nonexistent-file-or-buffer) file-name)
t))))
(if (one-window-p)
(find-file-other-window filename wildcards)
(save-selected-window
(other-window 1)
(find-alternate-file filename wildcards))))
(defun find-alternate-file (filename &optional wildcards)
"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.
See \\[find-file] for the possible forms of the FILENAME argument.
Interactively, or if WILDCARDS is non-nil in a call from Lisp,
expand wildcards (if any) and replace the file with multiple files.
If the current buffer is an indirect buffer, or the base buffer
for one or more indirect buffers, the other buffer(s) are not
killed."
(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
(confirm-nonexistent-file-or-buffer) file-name)
t)))
(unless (run-hook-with-args-until-failure 'kill-buffer-query-functions)
(error "Aborted"))
(when (and (buffer-modified-p) buffer-file-name)
(if (yes-or-no-p (format "Buffer %s is modified; save it first? "
(buffer-name)))
(save-buffer)
(unless (yes-or-no-p "Kill and replace the buffer without saving it? ")
(error "Aborted"))))
(let ((obuf (current-buffer))
(ofile buffer-file-name)
(onum buffer-file-number)
(odir dired-directory)
(otrue buffer-file-truename)
(oname (buffer-name)))
;; Run `kill-buffer-hook' here. It needs to happen before
;; variables like `buffer-file-name' etc are set to nil below,
;; because some of the hooks that could be invoked
;; (e.g., `save-place-to-alist') depend on those variables.
;;
;; Note that `kill-buffer-hook' is not what queries whether to
;; save a modified buffer visiting a file. Rather, `kill-buffer'
;; asks that itself. Thus, there's no need to temporarily do
;; `(set-buffer-modified-p nil)' before running this hook.
(run-hooks 'kill-buffer-hook)
;; Okay, now we can end-of-life the old buffer.
(if (get-buffer " **lose**")
(kill-buffer " **lose**"))
(rename-buffer " **lose**")
(unwind-protect
(progn
(unlock-buffer)
;; This prevents us from finding the same buffer
;; if we specified the same file again.
(setq buffer-file-name nil)
(setq buffer-file-number nil)
(setq buffer-file-truename nil)
;; Likewise for dired buffers.
(setq dired-directory nil)
(find-file filename wildcards))
(when (eq obuf (current-buffer))
;; This executes if find-file gets an error
;; and does not really find anything.
;; We put things back as they were.
;; If find-file actually finds something, we kill obuf below.
(setq buffer-file-name ofile)
(setq buffer-file-number onum)
(setq buffer-file-truename otrue)
(setq dired-directory odir)
(lock-buffer)
(rename-buffer oname)))
(unless (eq (current-buffer) obuf)
(with-current-buffer obuf
;; We already ran these; don't run them again.
(let (kill-buffer-query-functions kill-buffer-hook)
(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.
Spaces at the start of FILENAME (sans directory) are removed."
(let ((lastname (file-name-nondirectory filename)))
(if (string= lastname "")
(setq lastname filename))
(save-match-data
(string-match "^ *\\(.*\\)" lastname)
(generate-new-buffer (match-string 1 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)))
(defcustom automount-dir-prefix (purecopy "^/tmp_mnt/")
"Regexp to match the automounter prefix in a directory name."
:group 'files
:type 'regexp)
(defvar abbreviated-home-dir nil
"The user's homedir abbreviated according to `directory-abbrev-alist'.")
(defun abbreviate-file-name (filename)
"Return a version of FILENAME shortened using `directory-abbrev-alist'.
This also substitutes \"~\" for the user's home directory (unless the
home directory is a root directory) and removes automounter prefixes
\(see the variable `automount-dir-prefix')."
;; Get rid of the prefixes added by the automounter.
(save-match-data
(if (and automount-dir-prefix
(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)))))
;; Avoid treating /home/foo as /home/Foo during `~' substitution.
;; To fix this right, we need a `file-name-case-sensitive-p'
;; function, but we don't have that yet, so just guess.
(let ((case-fold-search
(memq system-type '(ms-dos windows-nt darwin cygwin))))
;; If any elt of directory-abbrev-alist matches this name,
;; abbreviate accordingly.
(dolist (dir-abbrev directory-abbrev-alist)
(if (string-match (car dir-abbrev) filename)
(setq filename
(concat (cdr dir-abbrev)
(substring filename (match-end 0))))))
;; 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 "$foo"))
(concat "\\`" (abbreviate-file-name (expand-file-name "~"))
"\\(/\\|\\'\\)"))))
;; If FILENAME starts with the abbreviated homedir,
;; make it start with `~' instead.
(if (and (string-match abbreviated-home-dir filename)
;; If the home dir is just /, don't change it.
(not (and (= (match-end 0) 1)
(= (aref filename 0) ?/)))
;; MS-DOS root directories can come with a drive letter;
;; Novell Netware allows drive letters beyond `Z:'.
(not (and (memq system-type '(ms-dos windows-nt cygwin))
(save-match-data
(string-match "^[a-zA-`]:/$" filename)))))
(setq filename
(concat "~"
(match-string 1 filename)
(substring filename (match-end 0)))))
filename)))
(defcustom find-file-not-true-dirname-list nil
"List of logical names for which visiting shouldn't save the true dirname."
:type '(repeat (string :tag "Name"))
:group 'find-file)
(defun find-buffer-visiting (filename &optional predicate)
"Return the buffer visiting file FILENAME (a string).
This is like `get-file-buffer', except that it checks for any buffer
visiting the same file, possibly under a different name.
If PREDICATE is non-nil, only buffers satisfying it are eligible,
and others are ignored.
If there is no such live buffer, return nil."
(let ((predicate (or predicate #'identity))
(truename (abbreviate-file-name (file-truename filename))))
(or (let ((buf (get-file-buffer filename)))
(when (and buf (funcall predicate buf)) buf))
(let ((list (buffer-list)) found)
(while (and (not found) list)
(with-current-buffer (car list)
(if (and buffer-file-name
(string= buffer-file-truename truename)
(funcall predicate (current-buffer)))
(setq found (car list))))
(setq list (cdr list)))
found)
(let* ((attributes (file-attributes truename))
(number (nthcdr 10 attributes))
(list (buffer-list)) found)
(and buffer-file-numbers-unique
(car-safe number) ;Make sure the inode is not just nil.
(while (and (not found) list)
(with-current-buffer (car list)
(if (and buffer-file-name
(equal buffer-file-number number)
;; Verify this buffer's file number
;; still belongs to its file.
(file-exists-p buffer-file-name)
(equal (file-attributes buffer-file-truename)
attributes)
(funcall predicate (current-buffer)))
(setq found (car list))))
(setq list (cdr list))))
found))))
(defcustom find-file-wildcards t
"Non-nil means file-visiting commands should handle wildcards.
For example, if you specify `*.c', that would visit all the files
whose names match the pattern."
:group 'files
:version "20.4"
:type 'boolean)
(defcustom find-file-suppress-same-file-warnings nil
"Non-nil means suppress warning messages for symlinked files.
When nil, Emacs prints a warning when visiting a file that is already
visited, but with a different name. Setting this option to t
suppresses this warning."
:group 'files
:version "21.1"
:type 'boolean)
(defcustom large-file-warning-threshold 10000000
"Maximum size of file above which a confirmation is requested.
When nil, never request confirmation."
:group 'files
:group 'find-file
:version "22.1"
:type '(choice integer (const :tag "Never request confirmation" nil)))
(defun abort-if-file-too-large (size op-type filename)
"If file SIZE larger than `large-file-warning-threshold', allow user to abort.
OP-TYPE specifies the file operation being performed (for message to user)."
(when (and large-file-warning-threshold size
(> size large-file-warning-threshold)
(not (y-or-n-p
(format "File %s is large (%dMB), really %s? "
(file-name-nondirectory filename)
(/ size 1048576) op-type))))
(error "Aborted")))
(defun find-file-noselect (filename &optional nowarn rawfile wildcards)
"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.
Optional second arg NOWARN non-nil means suppress any warning messages.
Optional third arg RAWFILE non-nil means the file is read literally.
Optional fourth arg WILDCARDS non-nil means do wildcard processing
and visit all the matching files. When wildcards are actually
used and expanded, return a list of buffers that are visiting
the various files."
(setq filename
(abbreviate-file-name
(expand-file-name filename)))
(if (file-directory-p filename)
(or (and find-file-run-dired
(run-hook-with-args-until-success
'find-directory-functions
(if find-file-visit-truename
(abbreviate-file-name (file-truename filename))
filename)))
(error "%s is a directory" filename))
(if (and wildcards
find-file-wildcards
(not (string-match "\\`/:" filename))
(string-match "[[*?]" filename))
(let ((files (condition-case nil
(file-expand-wildcards filename t)
(error (list filename))))
(find-file-wildcards nil))
(if (null files)
(find-file-noselect filename)
(mapcar #'find-file-noselect files)))
(let* ((buf (get-file-buffer filename))
(truename (abbreviate-file-name (file-truename filename)))
(attributes (file-attributes truename))
(number (nthcdr 10 attributes))
;; Find any buffer for a file which has same truename.
(other (and (not buf) (find-buffer-visiting filename))))
;; Let user know if there is a buffer with the same truename.
(if other
(progn
(or nowarn
find-file-suppress-same-file-warnings
(string-equal filename (buffer-file-name other))
(message "%s and %s are the same file"
filename (buffer-file-name other)))
;; Optionally also find that buffer.
(if (or find-file-existing-other-name find-file-visit-truename)
(setq buf other))))
;; Check to see if the file looks uncommonly large.
(when (not (or buf nowarn))
(abort-if-file-too-large (nth 7 attributes) "open" filename))
(if buf
;; We are using an existing buffer.
(let (nonexistent)
(or nowarn
(verify-visited-file-modtime buf)
(cond ((not (file-exists-p filename))
(setq nonexistent t)
(message "File %s no longer exists!" filename))
;; Certain files should be reverted automatically
;; if they have changed on disk and not in the buffer.
((and (not (buffer-modified-p buf))
(let ((tail revert-without-query)
(found nil))
(while tail
(if (string-match (car tail) filename)
(setq found t))
(setq tail (cdr tail)))
found))
(with-current-buffer buf
(message "Reverting file %s..." filename)
(revert-buffer t t)
(message "Reverting file %s...done" filename)))
((yes-or-no-p
(if (string= (file-name-nondirectory filename)
(buffer-name buf))
(format
(if (buffer-modified-p buf)
"File %s changed on disk. Discard your edits? "
"File %s changed on disk. Reread from disk? ")
(file-name-nondirectory filename))
(format
(if (buffer-modified-p buf)
"File %s changed on disk. Discard your edits in %s? "
"File %s changed on disk. Reread from disk into %s? ")
(file-name-nondirectory filename)
(buffer-name buf))))
(with-current-buffer buf
(revert-buffer t t)))))
(with-current-buffer buf
;; Check if a formerly read-only file has become
;; writable and vice versa, but if the buffer agrees
;; with the new state of the file, that is ok too.
(let ((read-only (not (file-writable-p buffer-file-name))))
(unless (or nonexistent
(eq read-only buffer-file-read-only)
(eq read-only buffer-read-only))
(when (or nowarn
(let ((question
(format "File %s is %s on disk. Change buffer mode? "
buffer-file-name
(if read-only "read-only" "writable"))))
(y-or-n-p question)))
(setq buffer-read-only read-only)))
(setq buffer-file-read-only read-only))
(when (and (not (eq (not (null rawfile))
(not (null find-file-literally))))
(not nonexistent)
;; It is confusing to ask whether to visit
;; non-literally if they have the file in
;; hexl-mode.
(not (eq major-mode 'hexl-mode)))
(if (buffer-modified-p)
(if (y-or-n-p
(format
(if rawfile
"The file %s is already visited normally,
and you have edited the buffer. Now you have asked to visit it literally,
meaning no coding system handling, format conversion, or local variables.
Emacs can only visit a file in one way at a time.
Do you want to save the file, and visit it literally instead? "
"The file %s is already visited literally,
meaning no coding system handling, format conversion, or local variables.
You have edited the buffer. Now you have asked to visit the file normally,
but Emacs can only visit a file in one way at a time.
Do you want to save the file, and visit it normally instead? ")
(file-name-nondirectory filename)))
(progn
(save-buffer)
(find-file-noselect-1 buf filename nowarn
rawfile truename number))
(if (y-or-n-p
(format
(if rawfile
"\
Do you want to discard your changes, and visit the file literally now? "
"\
Do you want to discard your changes, and visit the file normally now? ")))
(find-file-noselect-1 buf filename nowarn
rawfile truename number)
(error (if rawfile "File already visited non-literally"
"File already visited literally"))))
(if (y-or-n-p
(format
(if rawfile
"The file %s is already visited normally.
You have asked to visit it literally,
meaning no coding system decoding, format conversion, or local variables.
But Emacs can only visit a file in one way at a time.
Do you want to revisit the file literally now? "
"The file %s is already visited literally,
meaning no coding system decoding, format conversion, or local variables.
You have asked to visit it normally,
but Emacs can only visit a file in one way at a time.
Do you want to revisit the file normally now? ")
(file-name-nondirectory filename)))
(find-file-noselect-1 buf filename nowarn
rawfile truename number)
(error (if rawfile "File already visited non-literally"
"File already visited literally"))))))
;; Return the buffer we are using.
buf)
;; Create a new buffer.
(setq buf (create-file-buffer filename))
;; find-file-noselect-1 may use a different buffer.
(find-file-noselect-1 buf filename nowarn
rawfile truename number))))))
(defun find-file-noselect-1 (buf filename nowarn rawfile truename number)
(let (error)
(with-current-buffer buf
(kill-local-variable 'find-file-literally)
;; Needed in case we are re-visiting the file with a different
;; text representation.
(kill-local-variable 'buffer-file-coding-system)
(kill-local-variable 'cursor-type)
(let ((inhibit-read-only t))
(erase-buffer))
(and (default-value 'enable-multibyte-characters)
(not rawfile)
(set-buffer-multibyte t))
(if rawfile
(condition-case ()
(let ((inhibit-read-only t))
(insert-file-contents-literally filename t))
(file-error
(when (and (file-exists-p filename)
(not (file-readable-p filename)))
(kill-buffer buf)
(signal 'file-error (list "File is not readable"
filename)))
;; Unconditionally set error
(setq error t)))
(condition-case ()
(let ((inhibit-read-only t))
(insert-file-contents filename t))
(file-error
(when (and (file-exists-p filename)
(not (file-readable-p filename)))
(kill-buffer buf)
(signal 'file-error (list "File is not readable"
filename)))
;; Run find-file-not-found-functions until one returns non-nil.
(or (run-hook-with-args-until-success 'find-file-not-found-functions)
;; If they fail too, set error.
(setq error t)))))
;; Record the file's truename, and maybe use that as visited name.
(if (equal filename buffer-file-name)
(setq buffer-file-truename truename)
(setq buffer-file-truename
(abbreviate-file-name (file-truename buffer-file-name))))
(setq buffer-file-number number)
(if find-file-visit-truename
(setq buffer-file-name (expand-file-name buffer-file-truename)))
;; Set buffer's default directory to that of the file.
(setq default-directory (file-name-directory buffer-file-name))
;; Turn off backup files for certain file names. Since
;; this is a permanent local, the major mode won't eliminate it.
(and backup-enable-predicate
(not (funcall backup-enable-predicate buffer-file-name))
(progn
(make-local-variable 'backup-inhibited)
(setq backup-inhibited t)))
(if rawfile
(progn
(set-buffer-multibyte nil)
(setq buffer-file-coding-system 'no-conversion)
(set-buffer-major-mode buf)
(make-local-variable 'find-file-literally)
(setq find-file-literally t))
(after-find-file error (not nowarn)))
(current-buffer))))
(defun insert-file-contents-literally (filename &optional visit beg end replace)
"Like `insert-file-contents', but only reads in the file literally.
A buffer may be modified in several ways after reading into the buffer,
to Emacs features such as format decoding, character code
conversion, `find-file-hook', automatic uncompression, etc.
This function ensures that none of these modifications will take place."
(let ((format-alist nil)
(after-insert-file-functions nil)
(coding-system-for-read 'no-conversion)
(coding-system-for-write 'no-conversion)
(find-buffer-file-type-function
(if (fboundp 'find-buffer-file-type)
(symbol-function 'find-buffer-file-type)
nil))
(inhibit-file-name-handlers
(append '(jka-compr-handler image-file-handler epa-file-handler)
inhibit-file-name-handlers))
(inhibit-file-name-operation 'insert-file-contents))
(unwind-protect
(progn
(fset 'find-buffer-file-type (lambda (filename) t))
(insert-file-contents filename visit beg end replace))
(if find-buffer-file-type-function
(fset 'find-buffer-file-type find-buffer-file-type-function)
(fmakunbound 'find-buffer-file-type)))))
(defun insert-file-1 (filename insert-func)
(if (file-directory-p filename)
(signal 'file-error (list "Opening input file" "file is a directory"
filename)))
;; Check whether the file is uncommonly large
(abort-if-file-too-large (nth 7 (file-attributes filename)) "insert" filename)
(let* ((buffer (find-buffer-visiting (abbreviate-file-name (file-truename filename))
#'buffer-modified-p))
(tem (funcall insert-func filename)))
(push-mark (+ (point) (car (cdr tem))))
(when buffer
(message "File %s already visited and modified in buffer %s"
filename (buffer-name buffer)))))
(defun insert-file-literally (filename)
"Insert contents of file FILENAME into buffer after point with no conversion.
This function is meant for the user to run interactively.
Don't call it from programs! Use `insert-file-contents-literally' instead.
\(Its calling sequence is different; see its documentation)."
(interactive "*fInsert file literally: ")
(insert-file-1 filename #'insert-file-contents-literally))
(defvar find-file-literally nil
"Non-nil if this buffer was made by `find-file-literally' or equivalent.
This has the `permanent-local' property, which takes effect if you
make the variable buffer-local.")
(put 'find-file-literally 'permanent-local t)
(defun find-file-literally (filename)
"Visit file FILENAME with no conversion of any kind.
Format conversion and character code conversion are both disabled,
and multibyte characters are disabled in the resulting buffer.
The major mode used is Fundamental mode regardless of the file name,
and local variable specifications in the file are ignored.
Automatic uncompression and adding a newline at the end of the
file due to `require-final-newline' is also disabled.
You cannot absolutely rely on this function to result in
visiting the file literally. If Emacs already has a buffer
which is visiting the file, you get the existing buffer,
regardless of whether it was created literally or not.
In a Lisp program, if you want to be sure of accessing a file's
contents literally, you should create a temporary buffer and then read
the file contents into it using `insert-file-contents-literally'."
(interactive
(list (read-file-name
"Find file literally: " nil default-directory
(confirm-nonexistent-file-or-buffer))))
(switch-to-buffer (find-file-noselect filename nil t)))
(defvar after-find-file-from-revert-buffer nil)
(defun after-find-file (&optional error warn noauto
after-find-file-from-revert-buffer
nomodes)
"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.
Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER non-nil
means this call was from `revert-buffer'.
Fifth arg NOMODES non-nil means don't alter the file's modes.
Finishes by calling the functions in `find-file-hook'
unless NOMODES is non-nil."
(setq buffer-read-only (not (file-writable-p buffer-file-name)))
(if noninteractive
nil
(let* (not-serious
(msg
(cond
((not warn) nil)
((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
;; No need to warn if buffer is auto-saved
;; under the name of the visited file.
(not (and buffer-file-name
auto-save-visited-file-name))
(file-newer-than-file-p (or buffer-auto-save-file-name
(make-auto-save-file-name))
buffer-file-name))
(format "%s has auto save data; consider M-x recover-this-file"
(file-name-nondirectory buffer-file-name))
(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)
"Use M-x make-directory RET RET to create the directory and its parents"))))
(when msg
(message "%s" msg)
(or not-serious (sit-for 1 t))))
(when (and auto-save-default (not noauto))
(auto-save-mode t)))
;; Make people do a little extra work (C-x C-q)
;; before altering a backup file.
(when (backup-file-name-p buffer-file-name)
(setq buffer-read-only t))
;; When a file is marked read-only,
;; make the buffer read-only even if root is looking at it.
(when (and (file-modes (buffer-file-name))
(zerop (logand (file-modes (buffer-file-name)) #o222)))
(setq buffer-read-only t))
(unless nomodes
(when (and view-read-only view-mode)
(view-mode-disable))
(normal-mode t)
;; If requested, add a newline at the end of the file.
(and (memq require-final-newline '(visit visit-save))
(> (point-max) (point-min))
(/= (char-after (1- (point-max))) ?\n)
(not (and (eq selective-display t)
(= (char-after (1- (point-max))) ?\r)))
(save-excursion
(goto-char (point-max))
(insert "\n")))
(when (and buffer-read-only
view-read-only
(not (eq (get major-mode 'mode-class) 'special)))
(view-mode-enter))
(run-hooks 'find-file-hook)))
(defmacro report-errors (format &rest body)
"Eval BODY and turn any error into a FORMAT message.
FORMAT can have a %s escape which will be replaced with the actual error.
If `debug-on-error' is set, errors are not caught, so that you can
debug them.
Avoid using a large BODY since it is duplicated."
(declare (debug t) (indent 1))
`(if debug-on-error
(progn . ,body)
(condition-case err
(progn . ,body)
(error (message ,format (prin1-to-string err))))))
(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 the file-specified mode and local variables,
depending on the value of `enable-local-variables'.
In addition, if `local-enable-local-variables' is nil, we do
not set local variables (though we do notice a mode specified with -*-.)
`enable-local-variables' is ignored if you run `normal-mode' interactively,
or from Lisp without specifying the optional argument FIND-FILE;
in that case, this function acts as if `enable-local-variables' were t."
(interactive)
(funcall (or (default-value 'major-mode) 'fundamental-mode))
(let ((enable-local-variables (or (not find-file) enable-local-variables)))
(report-errors "File mode specification error: %s"
(set-auto-mode))
(report-errors "File local-variables error: %s"
(hack-local-variables)))
;; Turn font lock off and on, to make sure it takes account of
;; whatever file local variables are relevant to it.
(when (and font-lock-mode
;; Font-lock-mode (now in font-core.el) can be ON when
;; font-lock.el still hasn't been loaded.
(boundp 'font-lock-keywords)
(eq (car font-lock-keywords) t))
(setq font-lock-keywords (cadr font-lock-keywords))
(font-lock-mode 1))
(if (fboundp 'ucs-set-table-for-input) ; don't lose when building
(ucs-set-table-for-input)))
(defcustom auto-mode-case-fold nil
"Non-nil means to try second pass through `auto-mode-alist'.
This means that if the first case-sensitive search through the alist fails
to find a matching major mode, a second case-insensitive search is made.
On systems with case-insensitive file names, this variable is ignored,
since only a single case-insensitive search through the alist is made."
:group 'files
:version "22.1"
:type 'boolean)
(defvar auto-mode-alist
;; Note: The entries for the modes defined in cc-mode.el (c-mode,
;; c++-mode, java-mode and more) are added through autoload
;; directives in that file. That way is discouraged since it
;; spreads out the definition of the initial value.
(mapcar
(lambda (elt)
(cons (purecopy (car elt)) (cdr elt)))
`(;; do this first, so that .html.pl is Polish html, not Perl
("\\.s?html?\\(\\.[a-zA-Z_]+\\)?\\'" . html-mode)
("\\.te?xt\\'" . text-mode)
("\\.[tT]e[xX]\\'" . tex-mode)
("\\.ins\\'" . tex-mode) ;Installation files for TeX packages.
("\\.ltx\\'" . latex-mode)
("\\.dtx\\'" . doctex-mode)
("\\.org\\'" . org-mode)
("\\.el\\'" . emacs-lisp-mode)
("Project\\.ede\\'" . emacs-lisp-mode)
("\\.\\(scm\\|stk\\|ss\\|sch\\)\\'" . scheme-mode)
("\\.l\\'" . lisp-mode)
("\\.li?sp\\'" . lisp-mode)
("\\.[fF]\\'" . fortran-mode)
("\\.for\\'" . fortran-mode)
("\\.p\\'" . pascal-mode)
("\\.pas\\'" . pascal-mode)
("\\.\\(dpr\\|DPR\\)\\'" . delphi-mode)
("\\.ad[abs]\\'" . ada-mode)
("\\.ad[bs].dg\\'" . ada-mode)
("\\.\\([pP]\\([Llm]\\|erl\\|od\\)\\|al\\)\\'" . perl-mode)
("Imakefile\\'" . makefile-imake-mode)
("Makeppfile\\(?:\\.mk\\)?\\'" . makefile-makepp-mode) ; Put this before .mk
("\\.makepp\\'" . makefile-makepp-mode)
,@(if (memq system-type '(berkeley-unix darwin))
'(("\\.mk\\'" . makefile-bsdmake-mode)
("GNUmakefile\\'" . makefile-gmake-mode)
("[Mm]akefile\\'" . makefile-bsdmake-mode))
'(("\\.mk\\'" . makefile-gmake-mode) ; Might be any make, give Gnu the host advantage
("[Mm]akefile\\'" . makefile-gmake-mode)))
("\\.am\\'" . makefile-automake-mode)
;; Less common extensions come here
;; so more common ones above are found faster.
("\\.texinfo\\'" . texinfo-mode)
("\\.te?xi\\'" . texinfo-mode)
("\\.[sS]\\'" . asm-mode)
("\\.asm\\'" . asm-mode)
("[cC]hange\\.?[lL]og?\\'" . change-log-mode)
("[cC]hange[lL]og[-.][0-9]+\\'" . change-log-mode)
("\\$CHANGE_LOG\\$\\.TXT" . change-log-mode)
("\\.scm\\.[0-9]*\\'" . scheme-mode)
("\\.[ck]?sh\\'\\|\\.shar\\'\\|/\\.z?profile\\'" . sh-mode)
("\\.bash\\'" . sh-mode)
("\\(/\\|\\`\\)\\.\\(bash_profile\\|z?login\\|bash_login\\|z?logout\\)\\'" . sh-mode)
("\\(/\\|\\`\\)\\.\\(bash_logout\\|shrc\\|[kz]shrc\\|bashrc\\|t?cshrc\\|esrc\\)\\'" . sh-mode)
("\\(/\\|\\`\\)\\.\\([kz]shenv\\|xinitrc\\|startxrc\\|xsession\\)\\'" . sh-mode)
("\\.m?spec\\'" . sh-mode)
("\\.m[mes]\\'" . nroff-mode)
("\\.man\\'" . nroff-mode)
("\\.sty\\'" . latex-mode)
("\\.cl[so]\\'" . latex-mode) ;LaTeX 2e class option
("\\.bbl\\'" . latex-mode)
("\\.bib\\'" . bibtex-mode)
("\\.sql\\'" . sql-mode)
("\\.m[4c]\\'" . m4-mode)
("\\.mf\\'" . metafont-mode)
("\\.mp\\'" . metapost-mode)
("\\.vhdl?\\'" . vhdl-mode)
("\\.article\\'" . text-mode)
("\\.letter\\'" . text-mode)
("\\.i?tcl\\'" . tcl-mode)
("\\.exp\\'" . tcl-mode)
("\\.itk\\'" . tcl-mode)
("\\.icn\\'" . icon-mode)
("\\.sim\\'" . simula-mode)
("\\.mss\\'" . scribe-mode)
("\\.f9[05]\\'" . f90-mode)
("\\.indent\\.pro\\'" . fundamental-mode) ; to avoid idlwave-mode
("\\.\\(pro\\|PRO\\)\\'" . idlwave-mode)
("\\.srt\\'" . srecode-template-mode)
("\\.prolog\\'" . prolog-mode)
("\\.tar\\'" . tar-mode)
;; The list of archive file extensions should be in sync with
;; `auto-coding-alist' with `no-conversion' coding system.
("\\.\\(\
arc\\|zip\\|lzh\\|lha\\|zoo\\|[jew]ar\\|xpi\\|rar\\|\
ARC\\|ZIP\\|LZH\\|LHA\\|ZOO\\|[JEW]AR\\|XPI\\|RAR\\)\\'" . archive-mode)
("\\.\\(sx[dmicw]\\|od[fgpst]\\|oxt\\)\\'" . archive-mode) ;OpenOffice.org
("\\.\\(deb\\|[oi]pk\\)\\'" . archive-mode) ; Debian/Opkg packages.
;; Mailer puts message to be edited in
;; /tmp/Re.... or Message
("\\`/tmp/Re" . text-mode)
("/Message[0-9]*\\'" . text-mode)
("\\.zone\\'" . zone-mode)
;; some news reader is reported to use this
("\\`/tmp/fol/" . text-mode)
("\\.oak\\'" . scheme-mode)
("\\.sgml?\\'" . sgml-mode)
("\\.x[ms]l\\'" . xml-mode)
("\\.dbk\\'" . xml-mode)
("\\.dtd\\'" . sgml-mode)
("\\.ds\\(ss\\)?l\\'" . dsssl-mode)
("\\.js\\'" . js-mode) ; javascript-mode would be better
("\\.[ds]?vh?\\'" . verilog-mode)
;; .emacs or .gnus or .viper following a directory delimiter in
;; Unix, MSDOG or VMS syntax.
("[]>:/\\]\\..*\\(emacs\\|gnus\\|viper\\)\\'" . emacs-lisp-mode)
("\\`\\..*emacs\\'" . emacs-lisp-mode)
;; _emacs following a directory delimiter
;; in MsDos syntax
("[:/]_emacs\\'" . emacs-lisp-mode)
("/crontab\\.X*[0-9]+\\'" . shell-script-mode)
("\\.ml\\'" . lisp-mode)
;; Common Lisp ASDF package system.
("\\.asd\\'" . lisp-mode)
("\\.\\(asn\\|mib\\|smi\\)\\'" . snmp-mode)
("\\.\\(as\\|mi\\|sm\\)2\\'" . snmpv2-mode)
("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode)
("\\.\\(dif\\|pat\\)\\'" . diff-mode) ; for MSDOG
("\\.[eE]?[pP][sS]\\'" . ps-mode)
;; DocView disabled in Aquamacs due to crashes and extra software requirements.
;; ("\\.\\(?:PDF\\|DVI\\|pdf\\|dvi\\)\\'" . doc-view-mode)
("configure\\.\\(ac\\|in\\)\\'" . autoconf-mode)
("\\.s\\(v\\|iv\\|ieve\\)\\'" . sieve-mode)
("BROWSE\\'" . ebrowse-tree-mode)
("\\.ebrowse\\'" . ebrowse-tree-mode)
("#\\*mail\\*" . mail-mode)
("\\.g\\'" . antlr-mode)
("\\.ses\\'" . ses-mode)
("\\.\\(soa\\|zone\\)\\'" . dns-mode)
("\\.docbook\\'" . sgml-mode)
("\\.com\\'" . dcl-mode)
("/config\\.\\(?:bat\\|log\\)\\'" . fundamental-mode)
;; Windows candidates may be opened case sensitively on Unix
("\\.\\(?:[iI][nN][iI]\\|[lL][sS][tT]\\|[rR][eE][gG]\\|[sS][yY][sS]\\)\\'" . conf-mode)
("\\.\\(?:desktop\\|la\\)\\'" . conf-unix-mode)
("\\.ppd\\'" . conf-ppd-mode)
("java.+\\.conf\\'" . conf-javaprop-mode)
("\\.properties\\(?:\\.[a-zA-Z0-9._-]+\\)?\\'" . conf-javaprop-mode)
;; *.cf, *.cfg, *.conf, *.config[.local|.de_DE.UTF8|...], */config
("[/.]c\\(?:on\\)?f\\(?:i?g\\)?\\(?:\\.[a-zA-Z0-9._-]+\\)?\\'" . conf-mode-maybe)
("\\`/etc/\\(?:DIR_COLORS\\|ethers\\|.?fstab\\|.*hosts\\|lesskey\\|login\\.?de\\(?:fs\\|vperm\\)\\|magic\\|mtab\\|pam\\.d/.*\\|permissions\\(?:\\.d/.+\\)?\\|protocols\\|rpc\\|services\\)\\'" . conf-space-mode)
("\\`/etc/\\(?:acpid?/.+\\|aliases\\(?:\\.d/.+\\)?\\|default/.+\\|group-?\\|hosts\\..+\\|inittab\\|ksysguarddrc\\|opera6rc\\|passwd-?\\|shadow-?\\|sysconfig/.+\\)\\'" . conf-mode)
;; ChangeLog.old etc. Other change-log-mode entries are above;
;; this has lower priority to avoid matching changelog.sgml etc.
("[cC]hange[lL]og[-.][-0-9a-z]+\\'" . change-log-mode)
;; either user's dot-files or under /etc or some such
("/\\.?\\(?:gnokiirc\\|kde.*rc\\|mime\\.types\\|wgetrc\\)\\'" . conf-mode)
;; alas not all ~/.*rc files are like this
("/\\.\\(?:enigma\\|gltron\\|gtk\\|hxplayer\\|net\\|neverball\\|qt/.+\\|realplayer\\|scummvm\\|sversion\\|sylpheed/.+\\|xmp\\)rc\\'" . conf-mode)
("/\\.\\(?:gdbtkinit\\|grip\\|orbital/.+txt\\|rhosts\\|tuxracer/options\\)\\'" . conf-mode)
("/\\.?X\\(?:default\\|resource\\|re\\)s\\>" . conf-xdefaults-mode)
("/X11.+app-defaults/" . conf-xdefaults-mode)
("/X11.+locale/.+/Compose\\'" . conf-colon-mode)
;; this contains everything twice, with space and with colon :-(
("/X11.+locale/compose\\.dir\\'" . conf-javaprop-mode)
;; Get rid of any trailing .n.m and try again.
;; This is for files saved by cvs-merge that look like .#<file>.<rev>
;; or .#<file>.<rev>-<rev> or VC's <file>.~<rev>~.
;; Using mode nil rather than `ignore' would let the search continue
;; through this list (with the shortened name) rather than start over.
("\\.~?[0-9]+\\.[0-9][-.0-9]*~?\\'" nil t)
;; The following should come after the ChangeLog pattern
;; for the sake of ChangeLog.1, etc.
;; and after the .scm.[0-9] and CVS' <file>.<rev> patterns too.
("\\.[1-9]\\'" . nroff-mode)
("\\.\\(?:orig\\|in\\|[bB][aA][kK]\\)\\'" nil t)))
"Alist of filename patterns vs corresponding major mode functions.
Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
\(NON-NIL stands for anything that is not nil; the value does not matter.)
Visiting a file whose name matches REGEXP specifies FUNCTION as the
mode function to use. FUNCTION will be called, unless it is nil.
If the element has the form (REGEXP FUNCTION NON-NIL), then after
calling FUNCTION (if it's not nil), we delete the suffix that matched
REGEXP and search the list again for another match.
If the file name matches `inhibit-first-line-modes-regexps',
then `auto-mode-alist' is not processed.
The extensions whose FUNCTION is `archive-mode' should also
appear in `auto-coding-alist' with `no-conversion' coding system.
See also `interpreter-mode-alist', which detects executable script modes
based on the interpreters they specify to run,
and `magic-mode-alist', which determines modes based on file contents.")
(put 'auto-mode-alist 'risky-local-variable t)
(defun conf-mode-maybe ()
"Select Conf mode or XML mode according to start of file."
(if (save-excursion
(save-restriction
(widen)
(goto-char (point-min))
(looking-at "<\\?xml \\|<!-- \\|<!DOCTYPE ")))
(xml-mode)
(conf-mode)))
(defvar interpreter-mode-alist
;; Note: The entries for the modes defined in cc-mode.el (awk-mode
;; and pike-mode) are added through autoload directives in that
;; file. That way is discouraged since it spreads out the
;; definition of the initial value.
(mapcar
(lambda (l)
(cons (purecopy (car l)) (cdr l)))
'(("perl" . perl-mode)
("perl5" . perl-mode)
("miniperl" . perl-mode)
("wish" . tcl-mode)
("wishx" . tcl-mode)
("tcl" . tcl-mode)
("tclsh" . tcl-mode)
("scm" . scheme-mode)
("ash" . sh-mode)
("bash" . sh-mode)
("bash2" . sh-mode)
("csh" . sh-mode)
("dtksh" . sh-mode)
("es" . sh-mode)
("itcsh" . sh-mode)
("jsh" . sh-mode)
("ksh" . sh-mode)
("oash" . sh-mode)
("pdksh" . sh-mode)
("rc" . sh-mode)
("rpm" . sh-mode)
("sh" . sh-mode)
("sh5" . sh-mode)
("tcsh" . sh-mode)
("wksh" . sh-mode)
("wsh" . sh-mode)
("zsh" . sh-mode)
("tail" . text-mode)
("more" . text-mode)
("less" . text-mode)
("pg" . text-mode)
("make" . makefile-gmake-mode) ; Debian uses this
("guile" . scheme-mode)
("clisp" . lisp-mode)))
"Alist mapping interpreter names to major modes.
This is used for files whose first lines match `auto-mode-interpreter-regexp'.
Each element looks like (INTERPRETER . MODE).
If INTERPRETER matches the name of the interpreter specified in the first line
of a script, mode MODE is enabled.
See also `auto-mode-alist'.")
(defvar inhibit-first-line-modes-regexps (mapcar 'purecopy '("\\.tar\\'" "\\.tgz\\'"))
"List of regexps; if one matches a file name, don't look for `-*-'.")
(defvar inhibit-first-line-modes-suffixes nil
"List of regexps for what to ignore, for `inhibit-first-line-modes-regexps'.
When checking `inhibit-first-line-modes-regexps', we first discard
from the end of the file name anything that matches one of these regexps.")
(defvar auto-mode-interpreter-regexp
(purecopy "#![ \t]?\\([^ \t\n]*\
/bin/env[ \t]\\)?\\([^ \t\n]+\\)")
"Regexp matching interpreters, for file mode determination.
This regular expression is matched against the first line of a file
to determine the file's mode in `set-auto-mode'. If it matches, the file
is assumed to be interpreted by the interpreter matched by the second group
of the regular expression. The mode is then determined as the mode
associated with that interpreter in `interpreter-mode-alist'.")
(defvar magic-mode-alist nil
"Alist of buffer beginnings vs. corresponding major mode functions.
Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
After visiting a file, if REGEXP matches the text at the beginning of the
buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
call FUNCTION rather than allowing `auto-mode-alist' to decide the buffer's
major mode.
If FUNCTION is nil, then it is not called. (That is a way of saying
\"allow `auto-mode-alist' to decide for these files.\")")
(put 'magic-mode-alist 'risky-local-variable t)
(defvar magic-fallback-mode-alist
(purecopy
`((image-type-auto-detected-p . image-mode)
("\\(PK00\\)?[P]K\003\004" . archive-mode) ; zip
;; The < comes before the groups (but the first) to reduce backtracking.
;; TODO: UTF-16 <?xml may be preceded by a BOM 0xff 0xfe or 0xfe 0xff.
;; We use [ \t\r\n] instead of `\\s ' to make regex overflow less likely.
(,(let* ((incomment-re "\\(?:[^-]\\|-[^-]\\)")
(comment-re (concat "\\(?:!--" incomment-re "*-->[ \t\r\n]*<\\)")))
(concat "\\(?:<\\?xml[ \t\r\n]+[^>]*>\\)?[ \t\r\n]*<"
comment-re "*"
"\\(?:!DOCTYPE[ \t\r\n]+[^>]*>[ \t\r\n]*<[ \t\r\n]*" comment-re "*\\)?"
"[Hh][Tt][Mm][Ll]"))
. html-mode)
("<!DOCTYPE[ \t\r\n]+[Hh][Tt][Mm][Ll]" . html-mode)
;; These two must come after html, because they are more general:
("<\\?xml " . xml-mode)
(,(let* ((incomment-re "\\(?:[^-]\\|-[^-]\\)")
(comment-re (concat "\\(?:!--" incomment-re "*-->[ \t\r\n]*<\\)")))
(concat "[ \t\r\n]*<" comment-re "*!DOCTYPE "))
. sgml-mode)
("%!PS" . ps-mode)
("# xmcd " . conf-unix-mode)))
"Like `magic-mode-alist' but has lower priority than `auto-mode-alist'.
Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
After visiting a file, if REGEXP matches the text at the beginning of the
buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
call FUNCTION, provided that `magic-mode-alist' and `auto-mode-alist'
have not specified a mode for this file.
If FUNCTION is nil, then it is not called.")
(put 'magic-fallback-mode-alist 'risky-local-variable t)
(defvar magic-mode-regexp-match-limit 4000
"Upper limit on `magic-mode-alist' regexp matches.
Also applies to `magic-fallback-mode-alist'.")
(defun set-auto-mode (&optional keep-mode-if-same)
"Select major mode appropriate for current buffer.
To find the right major mode, this function checks for a -*- mode tag,
checks if it uses an interpreter listed in `interpreter-mode-alist',
matches the buffer beginning against `magic-mode-alist',
compares the filename against the entries in `auto-mode-alist',
then matches the buffer beginning against `magic-fallback-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.
If the optional argument KEEP-MODE-IF-SAME is non-nil, then we
set the major mode only if that would change it. In other words
we don't actually set it to the same mode the buffer already has."
;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
(let (end done mode modes)
;; Find a -*- mode tag
(save-excursion
(goto-char (point-min))
(skip-chars-forward " \t\n")
(and enable-local-variables
(setq end (set-auto-mode-1))
(if (save-excursion (search-forward ":" end t))
;; Find all specifications for the `mode:' variable
;; and execute them left to right.
(while (let ((case-fold-search t))
(or (and (looking-at "mode:")
(goto-char (match-end 0)))
(re-search-forward "[ \t;]mode:" end t)))
(skip-chars-forward " \t")
(let ((beg (point)))
(if (search-forward ";" end t)
(forward-char -1)
(goto-char end))
(skip-chars-backward " \t")
(push (intern (concat (downcase (buffer-substring beg (point))) "-mode"))
modes)))
;; Simple -*-MODE-*- case.
(push (intern (concat (downcase (buffer-substring (point) end))
"-mode"))
modes))))
;; If we found modes to use, invoke them now, outside the save-excursion.
(if modes
(catch 'nop
(dolist (mode (nreverse modes))
(if (not (functionp mode))
(message "Ignoring unknown mode `%s'" mode)
(setq done t)
(or (set-auto-mode-0 mode keep-mode-if-same)
;; continuing would call minor modes again, toggling them off
(throw 'nop nil))))))
;; If we didn't, look for an interpreter specified in the first line.
;; As a special case, allow for things like "#!/bin/env perl", which
;; finds the interpreter anywhere in $PATH.
(unless done
(setq mode (save-excursion
(goto-char (point-min))
(if (looking-at auto-mode-interpreter-regexp)
(match-string 2)
""))
;; Map interpreter name to a mode, signalling we're done at the
;; same time.
done (assoc (file-name-nondirectory mode)
interpreter-mode-alist))
;; If we found an interpreter mode to use, invoke it now.
(if done
(set-auto-mode-0 (cdr done) keep-mode-if-same)))
;; Next try matching the buffer beginning against magic-mode-alist.
(unless done
(if (setq done (save-excursion
(goto-char (point-min))
(save-restriction
(narrow-to-region (point-min)
(min (point-max)
(+ (point-min) magic-mode-regexp-match-limit)))
(assoc-default nil magic-mode-alist
(lambda (re dummy)
(if (functionp re)
(funcall re)
(looking-at re)))))))
(set-auto-mode-0 done keep-mode-if-same)))
;; Next compare the filename against the entries in auto-mode-alist.
(unless done
(if buffer-file-name
(let ((name buffer-file-name)
(remote-id (file-remote-p buffer-file-name)))
;; Remove remote file name identification.
(when (and (stringp remote-id)
(string-match (regexp-quote remote-id) name))
(setq name (substring name (match-end 0))))
;; Remove backup-suffixes from file name.
(setq name (file-name-sans-versions name))
(while name
;; Find first matching alist entry.
(setq mode
(if (memq system-type '(windows-nt cygwin))
;; System is case-insensitive.
(let ((case-fold-search t))
(assoc-default name auto-mode-alist
'string-match))
;; System is case-sensitive.
(or
;; First match case-sensitively.
(let ((case-fold-search nil))
(assoc-default name auto-mode-alist
'string-match))
;; Fallback to case-insensitive match.
(and auto-mode-case-fold
(let ((case-fold-search t))
(assoc-default name auto-mode-alist
'string-match))))))
(if (and mode
(consp mode)
(cadr mode))
(setq mode (car mode)
name (substring name 0 (match-beginning 0)))
(setq name))
(when mode
(set-auto-mode-0 mode keep-mode-if-same)
(setq done t))))))
;; Next try matching the buffer beginning against magic-fallback-mode-alist.
(unless done
(if (setq done (save-excursion
(goto-char (point-min))
(save-restriction
(narrow-to-region (point-min)
(min (point-max)
(+ (point-min) magic-mode-regexp-match-limit)))
(assoc-default nil magic-fallback-mode-alist
(lambda (re dummy)
(if (functionp re)
(funcall re)
(looking-at re)))))))
(set-auto-mode-0 done keep-mode-if-same)))))
;; When `keep-mode-if-same' is set, we are working on behalf of
;; set-visited-file-name. In that case, if the major mode specified is the
;; same one we already have, don't actually reset it. We don't want to lose
;; minor modes such as Font Lock.
(defun set-auto-mode-0 (mode &optional keep-mode-if-same)
"Apply MODE and return it.
If optional arg KEEP-MODE-IF-SAME is non-nil, MODE is chased of
any aliases and compared to current major mode. If they are the
same, do nothing and return nil."
(unless (and keep-mode-if-same
(eq (indirect-function mode)
(indirect-function major-mode)))
(when mode
(funcall mode)
mode)))
(defun set-auto-mode-1 ()
"Find the -*- spec in the buffer.
Call with point at the place to start searching from.
If one is found, set point to the beginning
and return the position of the end.
Otherwise, return nil; point may be changed."
(let (beg end)
(and
;; Don't look for -*- if this file name matches any
;; of the regexps in inhibit-first-line-modes-regexps.
(let ((temp inhibit-first-line-modes-regexps)
(name (if buffer-file-name
(file-name-sans-versions buffer-file-name)
(buffer-name))))
(while (let ((sufs inhibit-first-line-modes-suffixes))
(while (and sufs (not (string-match (car sufs) name)))
(setq sufs (cdr sufs)))
sufs)
(setq name (substring name 0 (match-beginning 0))))
(while (and temp
(not (string-match (car temp) name)))
(setq temp (cdr temp)))
(not temp))
(search-forward "-*-" (line-end-position
;; 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.
;; The same holds for
;; '\"
;; in man pages (preprocessor
;; magic for the `man' program).
(and (looking-at "^\\(#!\\|'\\\\\"\\)") 2)) t)
(progn
(skip-chars-forward " \t")
(setq beg (point))
(search-forward "-*-" (line-end-position) t))
(progn
(forward-char -3)
(skip-chars-backward " \t")
(setq end (point))
(goto-char beg)
end))))
;;; Handling file local variables
(defvar ignored-local-variables
'(ignored-local-variables safe-local-variable-values
file-local-variables-alist dir-local-variables-alist)
"Variables to be ignored in a file's local variable spec.")
(put 'ignored-local-variables 'risky-local-variable t)
(defvar hack-local-variables-hook nil
"Normal hook run after processing a file's local variables specs.
Major modes can use this to examine user-specified local variables
in order to initialize other data structure based on them.")
(defcustom safe-local-variable-values nil
"List variable-value pairs that are considered safe.
Each element is a cons cell (VAR . VAL), where VAR is a variable
symbol and VAL is a value that is considered safe."
:risky t
:group 'find-file
:type 'alist)
(defcustom safe-local-eval-forms
'((add-hook 'write-file-functions 'time-stamp)
(add-hook 'before-save-hook 'time-stamp))
"Expressions that are considered safe in an `eval:' local variable.
Add expressions to this list if you want Emacs to evaluate them, when
they appear in an `eval' local variable specification, without first
asking you for confirmation."
:risky t
:group 'find-file
:version "22.2"
:type '(repeat sexp))
;; Risky local variables:
(mapc (lambda (var) (put var 'risky-local-variable t))
'(after-load-alist
buffer-auto-save-file-name
buffer-file-name
buffer-file-truename
buffer-undo-list
debugger
default-text-properties
eval
exec-directory
exec-path
file-name-handler-alist
frame-title-format
global-mode-string
header-line-format
icon-title-format
inhibit-quit
load-path
max-lisp-eval-depth
max-specpdl-size
minor-mode-map-alist
minor-mode-overriding-map-alist
mode-line-format
mode-name
overriding-local-map
overriding-terminal-local-map
process-environment
standard-input
standard-output
unread-command-events))
;; Safe local variables:
;;
;; For variables defined by major modes, the safety declarations can go into
;; the major mode's file, since that will be loaded before file variables are
;; processed.
;;
;; For variables defined by minor modes, put the safety declarations in the
;; file defining the minor mode after the defcustom/defvar using an autoload
;; cookie, e.g.:
;;
;; ;;;###autoload(put 'variable 'safe-local-variable 'stringp)
;;
;; Otherwise, when Emacs visits a file specifying that local variable, the
;; minor mode file may not be loaded yet.
;;
;; For variables defined in the C source code the declaration should go here:
(mapc (lambda (pair)
(put (car pair) 'safe-local-variable (cdr pair)))
'((buffer-read-only . booleanp) ;; C source code
(default-directory . stringp) ;; C source code
(fill-column . integerp) ;; C source code
(indent-tabs-mode . booleanp) ;; C source code
(left-margin . integerp) ;; C source code
(no-update-autoloads . booleanp)
(tab-width . integerp) ;; C source code
(truncate-lines . booleanp) ;; C source code
(word-wrap . booleanp))) ;; C source code
(put 'c-set-style 'safe-local-eval-function t)
(defvar file-local-variables-alist nil
"Alist of file-local variable settings in the current buffer.
Each element in this list has the form (VAR . VALUE), where VAR
is a file-local variable (a symbol) and VALUE is the value
specified. The actual value in the buffer may differ from VALUE,
if it is changed by the major or minor modes, or by the user.")
(make-variable-buffer-local 'file-local-variables-alist)
(put 'file-local-variables-alist 'permanent-local t)
(defvar dir-local-variables-alist nil
"Alist of directory-local variable settings in the current buffer.
Each element in this list has the form (VAR . VALUE), where VAR
is a directory-local variable (a symbol) and VALUE is the value
specified in .dir-locals.el. The actual value in the buffer
may differ from VALUE, if it is changed by the major or minor modes,
or by the user.")
(make-variable-buffer-local 'dir-local-variables-alist)
(defvar before-hack-local-variables-hook nil
"Normal hook run before setting file-local variables.
It is called after checking for unsafe/risky variables and
setting `file-local-variables-alist', and before applying the
variables stored in `file-local-variables-alist'. A hook
function is allowed to change the contents of this alist.
This hook is called only if there is at least one file-local
variable to set.")
(defun hack-local-variables-confirm (all-vars unsafe-vars risky-vars dir-name)
"Get confirmation before setting up local variable values.
ALL-VARS is the list of all variables to be set up.
UNSAFE-VARS is the list of those that aren't marked as safe or risky.
RISKY-VARS is the list of those that are marked as risky.
DIR-NAME is a directory name if these settings come from
directory-local variables, or nil otherwise."
(if noninteractive
nil
(let ((name (or dir-name
(if buffer-file-name
(file-name-nondirectory buffer-file-name)
(concat "buffer " (buffer-name)))))
(offer-save (and (eq enable-local-variables t) unsafe-vars))
prompt char)
(save-window-excursion
(let ((buf (get-buffer-create "*Local Variables*")))
(pop-to-buffer buf)
(set (make-local-variable 'cursor-type) nil)
(erase-buffer)
(if unsafe-vars
(insert "The local variables list in " name
"\ncontains values that may not be safe (*)"
(if risky-vars
", and variables that are risky (**)."
"."))
(if risky-vars
(insert "The local variables list in " name
"\ncontains variables that are risky (**).")
(insert "A local variables list is specified in " name ".")))
(insert "\n\nDo you want to apply it? You can type
y -- to apply the local variables list.
n -- to ignore the local variables list.")
(if offer-save
(insert "
! -- to apply the local variables list, and permanently mark these
values (*) as safe (in the future, they will be set automatically.)\n\n")
(insert "\n\n"))
(dolist (elt all-vars)
(cond ((member elt unsafe-vars)
(insert " * "))
((member elt risky-vars)
(insert " ** "))
(t
(insert " ")))
(princ (car elt) buf)
(insert " : ")
;; Make strings with embedded whitespace easier to read.
(let ((print-escape-newlines t))
(prin1 (cdr elt) buf))
(insert "\n"))
(setq prompt
(format "Please type %s%s: "
(if offer-save "y, n, or !" "y or n")
(if (< (line-number-at-pos) (window-body-height))
""
", or C-v to scroll")))
(goto-char (point-min))
(let ((cursor-in-echo-area t)
(executing-kbd-macro executing-kbd-macro)
(exit-chars
(if offer-save '(?! ?y ?n ?\s ?\C-g) '(?y ?n ?\s ?\C-g)))
done)
(while (not done)
(message "%s" prompt)
(setq char (read-event))
(if (numberp char)
(cond ((eq char ?\C-v)
(condition-case nil
(scroll-up)
(error (goto-char (point-min)))))
;; read-event returns -1 if we are in a kbd
;; macro and there are no more events in the
;; macro. In that case, attempt to get an
;; event interactively.
((and executing-kbd-macro (= char -1))
(setq executing-kbd-macro nil))
(t (setq done (memq (downcase char) exit-chars)))))))
(setq char (downcase char))
(when (and offer-save (= char ?!) unsafe-vars)
(dolist (elt unsafe-vars)
(add-to-list 'safe-local-variable-values elt))
;; When this is called from desktop-restore-file-buffer,
;; coding-system-for-read may be non-nil. Reset it before
;; writing to .emacs.
(if (or custom-file user-init-file)
(let ((coding-system-for-read nil))
(customize-save-variable
'safe-local-variable-values
safe-local-variable-values))))
(kill-buffer buf)
(or (= char ?!)
(= char ?\s)
(= char ?y)))))))
(defun hack-local-variables-prop-line (&optional mode-only)
"Return local variables specified in the -*- line.
Ignore any specification for `mode:' and `coding:';
`set-auto-mode' should already have handled `mode:',
`set-auto-coding' should already have handled `coding:'.
If MODE-ONLY is non-nil, all we do is check whether the major
mode is specified, returning t if it is specified. Otherwise,
return an alist of elements (VAR . VAL), where VAR is a variable
and VAL is the specified value."
(save-excursion
(goto-char (point-min))
(let ((end (set-auto-mode-1))
result mode-specified)
;; Parse the -*- line into the RESULT alist.
;; Also set MODE-SPECIFIED if we see a spec or `mode'.
(cond ((not end)
nil)
((looking-at "[ \t]*\\([^ \t\n\r:;]+\\)\\([ \t]*-\\*-\\)")
;; Simple form: "-*- MODENAME -*-". Already handled.
(setq mode-specified t)
nil)
(t
;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
;; (last ";" is optional).
(while (< (point) end)
(or (looking-at "[ \t]*\\([^ \t\n:]+\\)[ \t]*:[ \t]*")
(error "Malformed -*- line"))
(goto-char (match-end 0))
;; There used to be a downcase here,
;; but the manual didn't say so,
;; and people want to set var names that aren't all lc.
(let ((key (intern (match-string 1)))
(val (save-restriction
(narrow-to-region (point) end)
(let ((read-circle nil))
(read (current-buffer))))))
;; It is traditional to ignore
;; case when checking for `mode' in set-auto-mode,
;; so we must do that here as well.
;; That is inconsistent, but we're stuck with it.
;; The same can be said for `coding' in set-auto-coding.
(or (and (equal (downcase (symbol-name key)) "mode")
(setq mode-specified t))
(equal (downcase (symbol-name key)) "coding")
(condition-case nil
(push (cons (if (eq key 'eval)
'eval
(indirect-variable key))
val) result)
(error nil)))
(skip-chars-forward " \t;")))))
(if mode-only
mode-specified
result))))
(defun hack-local-variables-filter (variables dir-name)
"Filter local variable settings, querying the user if necessary.
VARIABLES is the alist of variable-value settings. This alist is
filtered based on the values of `ignored-local-variables',
`enable-local-eval', `enable-local-variables', and (if necessary)
user interaction. The results are added to
`file-local-variables-alist', without applying them.
DIR-NAME is a directory name if these settings come from
directory-local variables, or nil otherwise."
;; Find those variables that we may want to save to
;; `safe-local-variable-values'.
(let (all-vars risky-vars unsafe-vars)
(dolist (elt variables)
(let ((var (car elt))
(val (cdr elt)))
(cond ((memq var ignored-local-variables)
;; Ignore any variable in `ignored-local-variables'.
nil)
;; Obey `enable-local-eval'.
((eq var 'eval)
(when enable-local-eval
(push elt all-vars)
(or (eq enable-local-eval t)
(hack-one-local-variable-eval-safep (eval (quote val)))
(safe-local-variable-p var val)
(push elt unsafe-vars))))
;; Ignore duplicates (except `mode') in the present list.
((and (assq var all-vars) (not (eq var 'mode))) nil)
;; Accept known-safe variables.
((or (memq var '(mode unibyte coding))
(safe-local-variable-p var val))
(push elt all-vars))
;; The variable is either risky or unsafe:
((not (eq enable-local-variables :safe))
(push elt all-vars)
(if (risky-local-variable-p var val)
(push elt risky-vars)
(push elt unsafe-vars))))))
(and all-vars
;; Query, unless all vars are safe or user wants no querying.
(or (and (eq enable-local-variables t)
(null unsafe-vars)
(null risky-vars))
(memq enable-local-variables '(:all :safe))
(hack-local-variables-confirm all-vars unsafe-vars
risky-vars dir-name))
(dolist (elt all-vars)
(unless (memq (car elt) '(eval mode))
(unless dir-name
(setq dir-local-variables-alist
(assq-delete-all (car elt) dir-local-variables-alist)))
(setq file-local-variables-alist
(assq-delete-all (car elt) file-local-variables-alist)))
(push elt file-local-variables-alist)))))
(defun hack-local-variables (&optional mode-only)
"Parse and put into effect this buffer's local variables spec.
If MODE-ONLY is non-nil, all we do is check whether the major mode
is specified, returning t if it is specified."
(let ((enable-local-variables
(and local-enable-local-variables enable-local-variables))
result)
(unless mode-only
(setq file-local-variables-alist nil)
(report-errors "Directory-local variables error: %s"
(hack-dir-local-variables)))
(when (or mode-only enable-local-variables)
(setq result (hack-local-variables-prop-line mode-only))
;; 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)
(when (let ((case-fold-search t))
(search-forward "Local Variables:" nil t))
(skip-chars-forward " \t")
;; suffix is what comes after "local variables:" in its line.
;; prefix is what comes before "local variables:" in its line.
(let ((suffix
(concat
(regexp-quote (buffer-substring (point)
(line-end-position)))
"$"))
(prefix
(concat "^" (regexp-quote
(buffer-substring (line-beginning-position)
(match-beginning 0)))))
beg)
(forward-line 1)
(let ((startpos (point))
endpos
(thisbuf (current-buffer)))
(save-excursion
(unless (let ((case-fold-search t))
(re-search-forward
(concat prefix "[ \t]*End:[ \t]*" suffix)
nil t))
;; This used to be an error, but really all it means is
;; that this may simply not be a local-variables section,
;; so just ignore it.
(message "Local variables list is not properly terminated"))
(beginning-of-line)
(setq endpos (point)))
(with-temp-buffer
(insert-buffer-substring thisbuf startpos endpos)
(goto-char (point-min))
(subst-char-in-region (point) (point-max) ?\^m ?\n)
(while (not (eobp))
;; Discard the prefix.
(if (looking-at prefix)
(delete-region (point) (match-end 0))
(error "Local variables entry is missing the prefix"))
(end-of-line)
;; Discard the suffix.
(if (looking-back suffix)
(delete-region (match-beginning 0) (point))
(error "Local variables entry is missing the suffix"))
(forward-line 1))
(goto-char (point-min))
(while (not (eobp))
;; 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 (let ((read-circle nil))
(read str)))
val)
;; Read the variable value.
(skip-chars-forward "^:")
(forward-char 1)
(let ((read-circle nil))
(setq val (read (current-buffer))))
(if mode-only
(if (eq var 'mode)
(setq result t))
(unless (eq var 'coding)
(condition-case nil
(push (cons (if (eq var 'eval)
'eval
(indirect-variable var))
val) result)
(error nil)))))
(forward-line 1))))))))
;; Now we've read all the local variables.
;; If MODE-ONLY is non-nil, return whether the mode was specified.
(cond (mode-only result)
;; Otherwise, set the variables.
(enable-local-variables
(hack-local-variables-filter result nil)
(when file-local-variables-alist
;; Any 'evals must run in the Right sequence.
(setq file-local-variables-alist
(nreverse file-local-variables-alist))
(run-hooks 'before-hack-local-variables-hook)
(dolist (elt file-local-variables-alist)
(hack-one-local-variable (car elt) (cdr elt))))
(run-hooks 'hack-local-variables-hook)))))
(defun safe-local-variable-p (sym val)
"Non-nil if SYM is safe as a file-local variable with value VAL.
It is safe if any of these conditions are met:
* There is a matching entry (SYM . VAL) in the
`safe-local-variable-values' user option.
* The `safe-local-variable' property of SYM is a function that
evaluates to a non-nil value with VAL as an argument."
(or (member (cons sym val) safe-local-variable-values)
(let ((safep (get sym 'safe-local-variable)))
(and (functionp safep)
;; If the function signals an error, that means it
;; can't assure us that the value is safe.
(with-demoted-errors (funcall safep val))))))
(defun risky-local-variable-p (sym &optional ignored)
"Non-nil if SYM could be dangerous as a file-local variable.
It is dangerous if either of these conditions are met:
* Its `risky-local-variable' property is non-nil.
* Its name ends with \"hook(s)\", \"function(s)\", \"form(s)\", \"map\",
\"program\", \"command(s)\", \"predicate(s)\", \"frame-alist\",
\"mode-alist\", \"font-lock-(syntactic-)keyword*\",
\"map-alist\", or \"bindat-spec\"."
;; If this is an alias, check the base name.
(condition-case nil
(setq sym (indirect-variable sym))
(error nil))
(or (get sym 'risky-local-variable)
(string-match "-hooks?$\\|-functions?$\\|-forms?$\\|-program$\\|\
-commands?$\\|-predicates?$\\|font-lock-keywords$\\|font-lock-keywords\
-[0-9]+$\\|font-lock-syntactic-keywords$\\|-frame-alist$\\|-mode-alist$\\|\
-map$\\|-map-alist$\\|-bindat-spec$" (symbol-name sym))))
(defun hack-one-local-variable-quotep (exp)
(and (consp exp) (eq (car exp) 'quote) (consp (cdr exp))))
(defun hack-one-local-variable-constantp (exp)
(or (and (not (symbolp exp)) (not (consp exp)))
(memq exp '(t nil))
(keywordp exp)
(hack-one-local-variable-quotep exp)))
(defun hack-one-local-variable-eval-safep (exp)
"Return t if it is safe to eval EXP when it is found in a file."
(or (not (consp exp))
;; Detect certain `put' expressions.
(and (eq (car exp) 'put)
(hack-one-local-variable-quotep (nth 1 exp))
(hack-one-local-variable-quotep (nth 2 exp))
(let ((prop (nth 1 (nth 2 exp)))
(val (nth 3 exp)))
(cond ((memq prop '(lisp-indent-hook
lisp-indent-function
scheme-indent-function))
;; Only allow safe values (not functions).
(or (numberp val)
(and (hack-one-local-variable-quotep val)
(eq (nth 1 val) 'defun))))
((eq prop 'edebug-form-spec)
;; Only allow indirect form specs.
;; During bootstrapping, edebug-basic-spec might not be
;; defined yet.
(and (fboundp 'edebug-basic-spec)
(hack-one-local-variable-quotep val)
(edebug-basic-spec (nth 1 val)))))))
;; Allow expressions that the user requested.
(member exp safe-local-eval-forms)
;; Certain functions can be allowed with safe arguments
;; or can specify verification functions to try.
(and (symbolp (car exp))
(let ((prop (get (car exp) 'safe-local-eval-function)))
(cond ((eq prop t)
(let ((ok t))
(dolist (arg (cdr exp))
(unless (hack-one-local-variable-constantp arg)
(setq ok nil)))
ok))
((functionp prop)
(funcall prop exp))
((listp prop)
(let ((ok nil))
(dolist (function prop)
(if (funcall function exp)
(setq ok t)))
ok)))))))
(defun hack-one-local-variable (var val)
"Set local variable VAR with value VAL.
If VAR is `mode', call `VAL-mode' as a function unless it's
already the major mode."
(cond ((eq var 'mode)
(let ((mode (intern (concat (downcase (symbol-name val))
"-mode"))))
(unless (eq (indirect-function mode)
(indirect-function major-mode))
(if (memq mode minor-mode-list)
;; A minor mode must be passed an argument.
;; Otherwise, if the user enables the minor mode in a
;; major mode hook, this would toggle it off.
(funcall mode 1)
(funcall mode)))))
((eq var 'eval)
(save-excursion (eval val)))
(t
;; Make sure the string has no text properties.
;; Some text properties can get evaluated in various ways,
;; so it is risky to put them on with a local variable list.
(if (stringp val)
(set-text-properties 0 (length val) nil val))
(set (make-local-variable var) val))))
;;; Handling directory-local variables, aka project settings.
(defvar dir-locals-class-alist '()
"Alist mapping directory-local variable classes (symbols) to variable lists.")
(defvar dir-locals-directory-cache '()
"List of cached directory roots for directory-local variable classes.
Each element in this list has the form (DIR CLASS MTIME).
DIR is the name of the directory.
CLASS is the name of a variable class (a symbol).
MTIME is the recorded modification time of the directory-local
variables file associated with this entry. This time is a list
of two integers (the same format as `file-attributes'), and is
used to test whether the cache entry is still valid.
Alternatively, MTIME can be nil, which means the entry is always
considered valid.")
(defsubst dir-locals-get-class-variables (class)
"Return the variable list for CLASS."
(cdr (assq class dir-locals-class-alist)))
(defun dir-locals-collect-mode-variables (mode-variables variables)
"Collect directory-local variables from MODE-VARIABLES.
VARIABLES is the initial list of variables.
Returns the new list."
(dolist (pair mode-variables variables)
(let* ((variable (car pair))
(value (cdr pair))
(slot (assq variable variables)))
;; If variables are specified more than once, only use the last. (Why?)
;; The pseudo-variables mode and eval are different (bug#3430).
(if (and slot (not (memq variable '(mode eval))))
(setcdr slot value)
;; Need a new cons in case we setcdr later.
(push (cons variable value) variables)))))
(defun dir-locals-collect-variables (class-variables root variables)
"Collect entries from CLASS-VARIABLES into VARIABLES.
ROOT is the root directory of the project.
Return the new variables list."
(let* ((file-name (buffer-file-name))
(sub-file-name (if file-name
(substring file-name (length root)))))
(dolist (entry class-variables variables)
(let ((key (car entry)))
(cond
((stringp key)
;; Don't include this in the previous condition, because we
;; want to filter all strings before the next condition.
(when (and sub-file-name
(>= (length sub-file-name) (length key))
(string= key (substring sub-file-name 0 (length key))))
(setq variables (dir-locals-collect-variables
(cdr entry) root variables))))
((or (not key)
(derived-mode-p key))
(setq variables (dir-locals-collect-mode-variables
(cdr entry) variables))))))))
(defun dir-locals-set-directory-class (directory class &optional mtime)
"Declare that the DIRECTORY root is an instance of CLASS.
DIRECTORY is the name of a directory, a string.
CLASS is the name of a project class, a symbol.
MTIME is either the modification time of the directory-local
variables file that defined this class, or nil.
When a file beneath DIRECTORY is visited, the mode-specific
variables from CLASS are applied to the buffer. The variables
for a class are defined using `dir-locals-set-class-variables'."
(setq directory (file-name-as-directory (expand-file-name directory)))
(unless (assq class dir-locals-class-alist)
(error "No such class `%s'" (symbol-name class)))
(push (list directory class mtime) dir-locals-directory-cache))
(defun dir-locals-set-class-variables (class variables)
"Map the type CLASS to a list of variable settings.
CLASS is the project class, a symbol. VARIABLES is a list
that declares directory-local variables for the class.
An element in VARIABLES is either of the form:
(MAJOR-MODE . ALIST)
or
(DIRECTORY . LIST)
In the first form, MAJOR-MODE is a symbol, and ALIST is an alist
whose elements are of the form (VARIABLE . VALUE).
In the second form, DIRECTORY is a directory name (a string), and
LIST is a list of the form accepted by the function.
When a file is visited, the file's class is found. A directory
may be assigned a class using `dir-locals-set-directory-class'.
Then variables are set in the file's buffer according to the
class' LIST. The list is processed in order.
* If the element is of the form (MAJOR-MODE . ALIST), and the
buffer's major mode is derived from MAJOR-MODE (as determined
by `derived-mode-p'), then all the variables in ALIST are
applied. A MAJOR-MODE of nil may be used to match any buffer.
`make-local-variable' is called for each variable before it is
set.
* If the element is of the form (DIRECTORY . LIST), and DIRECTORY
is an initial substring of the file's directory, then LIST is
applied by recursively following these rules."
(let ((elt (assq class dir-locals-class-alist)))
(if elt
(setcdr elt variables)
(push (cons class variables) dir-locals-class-alist))))
(defconst dir-locals-file ".dir-locals.el"
"File that contains directory-local variables.
It has to be constant to enforce uniform values
across different environments and users.")
(defun dir-locals-find-file (file)
"Find the directory-local variables for FILE.
This searches upward in the directory tree from FILE.
If the directory root of FILE has been registered in
`dir-locals-directory-cache' and the directory-local variables
file has not been modified, return the matching entry in
`dir-locals-directory-cache'.
Otherwise, if a directory-local variables file is found, return
the file name.
Otherwise, return nil."
(setq file (expand-file-name file))
(let* ((dir-locals-file-name
(if (eq system-type 'ms-dos)
(dosified-file-name dir-locals-file)
dir-locals-file))
(locals-file (locate-dominating-file file dir-locals-file-name))
(dir-elt nil))
;; `locate-dominating-file' may have abbreviated the name.
(when locals-file
(setq locals-file (expand-file-name dir-locals-file-name locals-file)))
;; Find the best cached value in `dir-locals-directory-cache'.
(dolist (elt dir-locals-directory-cache)
(when (and (eq t (compare-strings file nil (length (car elt))
(car elt) nil nil
(memq system-type
'(windows-nt cygwin ms-dos))))
(> (length (car elt)) (length (car dir-elt))))
(setq dir-elt elt)))
(let ((use-cache (and dir-elt
(or (null locals-file)
(<= (length (file-name-directory locals-file))
(length (car dir-elt)))))))
(if use-cache
;; Check the validity of the cache.
(if (and (file-readable-p (car dir-elt))
(or (null (nth 2 dir-elt))
(equal (nth 2 dir-elt)
(nth 5 (file-attributes (car dir-elt))))))
;; This cache entry is OK.
dir-elt
;; This cache entry is invalid; clear it.
(setq dir-locals-directory-cache
(delq dir-elt dir-locals-directory-cache))
locals-file)
locals-file))))
(defun dir-locals-read-from-file (file)
"Load a variables FILE and register a new class and instance.
FILE is the name of the file holding the variables to apply.
The new class name is the same as the directory in which FILE
is found. Returns the new class name."
(with-temp-buffer
(insert-file-contents file)
(let* ((dir-name (file-name-directory file))
(class-name (intern dir-name))
(variables (let ((read-circle nil))
(read (current-buffer)))))
(dir-locals-set-class-variables class-name variables)
(dir-locals-set-directory-class dir-name class-name
(nth 5 (file-attributes file)))
class-name)))
(defun hack-dir-local-variables ()
"Read per-directory local variables for the current buffer.
Store the directory-local variables in `dir-local-variables-alist'
and `file-local-variables-alist', without applying them."
(when (and enable-local-variables
(buffer-file-name)
(not (file-remote-p (buffer-file-name))))
;; Find the variables file.
(let ((variables-file (dir-locals-find-file (buffer-file-name)))
(class nil)
(dir-name nil))
(cond
((stringp variables-file)
(setq dir-name (file-name-directory (buffer-file-name)))
(setq class (dir-locals-read-from-file variables-file)))
((consp variables-file)
(setq dir-name (nth 0 variables-file))
(setq class (nth 1 variables-file))))
(when class
(let ((variables
(dir-locals-collect-variables
(dir-locals-get-class-variables class) dir-name nil)))
(when variables
(dolist (elt variables)
(unless (memq (car elt) '(eval mode))
(setq dir-local-variables-alist
(assq-delete-all (car elt) dir-local-variables-alist)))
(push elt dir-local-variables-alist))
(hack-local-variables-filter variables dir-name)))))))
(defcustom change-major-mode-with-file-name t
"Non-nil means \\[write-file] should set the major mode from the file name.
However, the mode will not be changed if
\(1) a local variables list or the `-*-' line specifies a major mode, or
\(2) the current major mode is a \"special\" mode,
\ not suitable for ordinary files, or
\(3) the new file name does not particularly specify any mode."
:type 'boolean
:group 'editing-basics)
(defun set-visited-file-name (filename &optional no-query along-with-file)
"Change name of file visited in current buffer to FILENAME.
This also renames the buffer to correspond to the new file.
The next time the buffer is saved it will go in the newly specified file.
FILENAME nil or an empty string means mark buffer as not visiting any file.
Remember to delete the initial contents of the minibuffer
if you wish to pass an empty string as the argument.
The optional second argument NO-QUERY, if non-nil, inhibits asking for
confirmation in the case where another buffer is already visiting FILENAME.
The optional third argument ALONG-WITH-FILE, if non-nil, means that
the old visited file has been renamed to the new name FILENAME."
(interactive "FSet visited file name: ")
(if (buffer-base-buffer)
(error "An indirect buffer cannot visit a file"))
(let (truename)
(if filename
(setq filename
(if (string-equal filename "")
nil
(expand-file-name filename))))
(if filename
(progn
(setq truename (file-truename filename))
(if find-file-visit-truename
(setq filename truename))))
(if filename
(let ((new-name (file-name-nondirectory filename)))
(if (string= new-name "")
(error "Empty file name"))))
(let ((buffer (and filename (find-buffer-visiting filename))))
(and buffer (not (eq buffer (current-buffer)))
(not no-query)
(not (y-or-n-p (format "A buffer is visiting %s; proceed? "
filename)))
(error "Aborted")))
(or (equal filename buffer-file-name)
(progn
(and filename (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)))
(setq default-directory (file-name-directory buffer-file-name))
;; If new-name == old-name, renaming would add a spurious <2>
;; and it's considered as a feature in rename-buffer.
(or (string= new-name (buffer-name))
(rename-buffer new-name t))))
(setq buffer-backed-up nil)
(or along-with-file
(clear-visited-file-modtime))
;; Abbreviate the file names of the buffer.
(if truename
(progn
(setq buffer-file-truename (abbreviate-file-name truename))
(if find-file-visit-truename
(setq buffer-file-name truename))))
(setq buffer-file-number
(if filename
(nthcdr 10 (file-attributes buffer-file-name))
nil)))
;; write-file-functions 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-functions)
(kill-local-variable 'local-write-file-hooks)
(kill-local-variable 'revert-buffer-function)
(kill-local-variable 'backup-inhibited)
;; If buffer was read-only because of version control,
;; that reason is gone now, so make it writable.
(if vc-mode
(setq buffer-read-only nil))
(kill-local-variable 'vc-mode)
;; Turn off backup files for certain file names.
;; Since this is a permanent local, the major mode won't eliminate it.
(and buffer-file-name
backup-enable-predicate
(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<