;;; simple.el --- basic editing commands for Emacs -*- lexical-binding: t -*-
-;; Copyright (C) 1985-1987, 1993-2015 Free Software Foundation, Inc.
+;; Copyright (C) 1985-1987, 1993-2016 Free Software Foundation, Inc.
;; Maintainer: emacs-devel@gnu.org
;; Keywords: internal
&optional avoid-current
extra-test-inclusive
extra-test-exclusive)
- "Test if BUFFER is a `next-error' capable buffer.
-
-If AVOID-CURRENT is non-nil, treat the current buffer
-as an absolute last resort only.
-
-The function EXTRA-TEST-INCLUSIVE, if non-nil, is called in each buffer
-that normally would not qualify. If it returns t, the buffer
-in question is treated as usable.
-
-The function EXTRA-TEST-EXCLUSIVE, if non-nil, is called in each buffer
-that would normally be considered usable. If it returns nil,
-that buffer is rejected."
+ "Return non-nil if BUFFER is a `next-error' capable buffer.
+If AVOID-CURRENT is non-nil, and BUFFER is the current buffer,
+return nil.
+
+The function EXTRA-TEST-INCLUSIVE, if non-nil, is called if
+BUFFER would not normally qualify. If it returns non-nil, BUFFER
+is considered `next-error' capable, anyway, and the function
+returns non-nil.
+
+The function EXTRA-TEST-EXCLUSIVE, if non-nil, is called if the
+buffer would normally qualify. If it returns nil, BUFFER is
+rejected, and the function returns nil."
(and (buffer-name buffer) ;First make sure it's live.
(not (and avoid-current (eq buffer (current-buffer))))
(with-current-buffer buffer
(last-command-event ?\n)
;; Don't auto-fill if we have a numeric argument.
(auto-fill-function (if arg nil auto-fill-function))
+ (arg (prefix-numeric-value arg))
(postproc
;; Do the rest in post-self-insert-hook, because we want to do it
;; *before* other functions on that hook.
(lambda ()
- (cl-assert (eq ?\n (char-before)))
+ ;; We are not going to insert any newlines if arg is
+ ;; non-positive.
+ (or (and (numberp arg) (<= arg 0))
+ (cl-assert (eq ?\n (char-before))))
;; Mark the newline(s) `hard'.
(if use-hard-newlines
(set-hard-newline-properties
- (- (point) (prefix-numeric-value arg)) (point)))
+ (- (point) arg) (point)))
;; If the newline leaves the previous line blank, and we
;; have a left margin, delete that from the blank line.
(save-excursion
(move-to-left-margin nil t)))))
(unwind-protect
(if (not interactive)
- ;; FIXME: For non-interactive uses, many calls actually just want
- ;; (insert "\n"), so maybe we should do just that, so as to avoid
- ;; the risk of filling or running abbrevs unexpectedly.
- (let ((post-self-insert-hook (list postproc)))
- (self-insert-command (prefix-numeric-value arg)))
- (unwind-protect
- (progn
- (add-hook 'post-self-insert-hook postproc nil t)
- (self-insert-command (prefix-numeric-value arg)))
- ;; We first used let-binding to protect the hook, but that was naive
- ;; since add-hook affects the symbol-default value of the variable,
- ;; whereas the let-binding might only protect the buffer-local value.
- (remove-hook 'post-self-insert-hook postproc t)))
+ ;; FIXME: For non-interactive uses, many calls actually
+ ;; just want (insert "\n"), so maybe we should do just
+ ;; that, so as to avoid the risk of filling or running
+ ;; abbrevs unexpectedly.
+ (let ((post-self-insert-hook (list postproc)))
+ (self-insert-command arg))
+ (unwind-protect
+ (progn
+ (add-hook 'post-self-insert-hook postproc nil t)
+ (self-insert-command arg))
+ ;; We first used let-binding to protect the hook, but that
+ ;; was naive since add-hook affects the symbol-default
+ ;; value of the variable, whereas the let-binding might
+ ;; only protect the buffer-local value.
+ (remove-hook 'post-self-insert-hook postproc t)))
(cl-assert (not (member postproc post-self-insert-hook)))
(cl-assert (not (member postproc (default-value 'post-self-insert-hook))))))
nil)
(list nil nil))))
(save-match-data
(save-excursion
- (let ((end-marker (copy-marker (or end (point-max))))
- (start (or start (point-min))))
- (goto-char start)
- (while (re-search-forward "\\s-$" end-marker t)
- (skip-syntax-backward "-" (line-beginning-position))
+ (let ((end-marker (and end (copy-marker end))))
+ (goto-char (or start (point-min)))
+ (with-syntax-table (make-syntax-table (syntax-table))
;; Don't delete formfeeds, even if they are considered whitespace.
- (if (looking-at-p ".*\f")
- (goto-char (match-end 0)))
- (delete-region (point) (match-end 0)))
- ;; Delete trailing empty lines.
- (goto-char end-marker)
- (when (and (not end)
- delete-trailing-lines
- ;; Really the end of buffer.
- (= (point-max) (1+ (buffer-size)))
- (<= (skip-chars-backward "\n") -2))
- (delete-region (1+ (point)) end-marker))
- (set-marker end-marker nil))))
+ (modify-syntax-entry ?\f "_")
+ ;; Treating \n as non-whitespace makes things easier.
+ (modify-syntax-entry ?\n "_")
+ (while (re-search-forward "\\s-+$" end-marker t)
+ (delete-region (match-beginning 0) (match-end 0))))
+ (if end
+ (set-marker end-marker nil)
+ ;; Delete trailing empty lines.
+ (and delete-trailing-lines
+ ;; Really the end of buffer.
+ (= (goto-char (point-max)) (1+ (buffer-size)))
+ (<= (skip-chars-backward "\n") -2)
+ (delete-region (1+ (point)) (point-max)))))))
;; Return nil for the benefit of `write-file-functions'.
nil)
is undefined. If DELETE is nil, just return the content as a string.
If DELETE is `bounds', then don't delete, but just return the
boundaries of the region as a list of (START . END) positions.
-If anything else, delete the region and return its content as a string.")
+If anything else, delete the region and return its content as a string,
+after filtering it with `filter-buffer-substring'.")
(defvar region-insert-function
(lambda (lines)
kill ring) instead of delete. Interactively, N is the prefix
arg, and KILLFLAG is set if N is explicitly specified.
+When killing, the killed text is filtered by
+`filter-buffer-substring' before it is saved in the kill ring, so
+the actual saved text might be different from what was killed.
+
In Overwrite mode, single character backward deletion may replace
tabs with spaces so as to back over columns, unless point is at
the end of the line."
Optional second arg KILLFLAG non-nil means to kill (save in kill
ring) instead of delete. Interactively, N is the prefix arg, and
-KILLFLAG is set if N was explicitly specified."
+KILLFLAG is set if N was explicitly specified.
+
+When killing, the killed text is filtered by
+`filter-buffer-substring' before it is saved in the kill ring, so
+the actual saved text might be different from what was killed."
(declare (interactive-only delete-char))
(interactive "p\nP")
(unless (integerp n)
(interactive)
(push-mark (point))
(push-mark (point-max) nil t)
- (goto-char (point-min)))
+ ;; This is really `point-min' in most cases, but if we're in the
+ ;; minibuffer, this is at the end of the prompt.
+ (goto-char (minibuffer-prompt-end)))
\f
;; Counting lines, one way or another.
(save-restriction
(narrow-to-region start end)
(goto-char (point-min))
- (while (forward-word 1)
+ (while (forward-word-strictly 1)
(setq words (1+ words)))))
words))
((use-region-p)
:version "21.1")
(defun eval-expression-print-format (value)
- "Format VALUE as a result of evaluated expression.
-Return a formatted string which is displayed in the echo area
-in addition to the value printed by prin1 in functions which
-display the result of expression evaluation."
+ "If VALUE in an integer, return a specially formatted string.
+This string will typically look like \" (#o1, #x1, ?\\C-a)\".
+If VALUE is not an integer, nil is returned.
+This function is used by functions like `prin1' that display the
+result of expression evaluation."
(if (and (integerp value)
(or (eq standard-output t)
(zerop (prefix-numeric-value current-prefix-arg))))
(integer :tag "time" 2)
(other :tag "on")))
+(defcustom extended-command-suggest-shorter t
+ "If non-nil, show a shorter M-x invocation when there is one."
+ :group 'keyboard
+ :type 'boolean
+ :version "25.2")
+
(defun execute-extended-command--shorter-1 (name length)
(cond
((zerop length) (list ""))
((numberp suggest-key-bindings) suggest-key-bindings)
(t 2))))))
(when (and waited (not (consp unread-command-events)))
- (unless (or binding executing-kbd-macro (not (symbolp function))
+ (unless (or (not extended-command-suggest-shorter)
+ binding executing-kbd-macro (not (symbolp function))
(<= (length (symbol-name function)) 2))
;; There's no binding for CMD. Let's try and find the shortest
;; string to use in M-x.
;; the end of the line when it fails to go to the next line.
(goto-char old-point)
(next-history-element arg)
+ ;; Reset `temporary-goal-column' because a correct value is not
+ ;; calculated when `next-line' above fails by bumping against
+ ;; the bottom of the minibuffer (bug#22544).
+ (setq temporary-goal-column 0)
;; Restore the original goal column on the last line
;; of possibly multi-line input.
(goto-char (point-max))
;; the beginning of the line when it fails to go to the previous line.
(goto-char old-point)
(previous-history-element arg)
+ ;; Reset `temporary-goal-column' because a correct value is not
+ ;; calculated when `previous-line' above fails by bumping against
+ ;; the top of the minibuffer (bug#22544).
+ (setq temporary-goal-column 0)
;; Restore the original goal column on the first line
;; of possibly multi-line input.
(goto-char (minibuffer-prompt-end))
(if (= (line-number-at-pos) 1)
(move-to-column (+ old-column (1- (minibuffer-prompt-end))))
(move-to-column old-column))
- (goto-char (line-end-position)))))))
+ ;; Put the cursor at the end of the visual line instead of the
+ ;; logical line, so the next `previous-line-or-history-element'
+ ;; would move to the previous history element, not to a possible upper
+ ;; visual line from the end of logical line in `line-move-visual' mode.
+ (end-of-visual-line)
+ ;; Since `end-of-visual-line' puts the cursor at the beginning
+ ;; of the next visual line, move it one char back to the end
+ ;; of the first visual line (bug#22544).
+ (unless (eolp) (backward-char 1)))))))
(defun next-complete-history-element (n)
"Get next history element which completes the minibuffer before the point.
"Check recently changed buffers and add a boundary if necessary.
REASON describes the reason that the boundary is being added; see
`undo-last-boundary' for more information."
+ ;; (Bug #23785) All commands should ensure that there is an undo
+ ;; boundary whether they have changed the current buffer or not.
+ (when (eq cause 'command)
+ (add-to-list 'undo-auto--undoably-changed-buffers (current-buffer)))
(dolist (b undo-auto--undoably-changed-buffers)
(when (buffer-live-p b)
(with-current-buffer b
This list is maintained by `undo-auto--undoable-change' and
`undo-auto--boundaries' and can be affected by changes to their
-default values.
-
-See also `undo-auto--buffer-undoably-changed'.")
+default values.")
(defun undo-auto--add-boundary ()
"Add an `undo-boundary' in appropriate buffers."
have been made. By default `self-insert-command' and
`delete-char' are the only amalgamating commands, although this
function could be called by any command wishing to have this
-behaviour."
+behavior."
(let ((last-amalgamating-count
(undo-auto--last-boundary-amalgamating-number)))
(setq undo-auto--this-command-amalgamating t)
(undo-auto--boundary-ensure-timer))
;; End auto-boundary section
+(defun undo-amalgamate-change-group (handle)
+ "Amalgamate changes in change-group since HANDLE.
+Remove all undo boundaries between the state of HANDLE and now.
+HANDLE is as returned by `prepare-change-group'."
+ (dolist (elt handle)
+ (with-current-buffer (car elt)
+ (setq elt (cdr elt))
+ (when (consp buffer-undo-list)
+ (let ((old-car (car-safe elt))
+ (old-cdr (cdr-safe elt)))
+ (unwind-protect
+ (progn
+ ;; Temporarily truncate the undo log at ELT.
+ (when (consp elt)
+ (setcar elt t) (setcdr elt nil))
+ (when
+ (or (null elt) ;The undo-log was empty.
+ ;; `elt' is still in the log: normal case.
+ (eq elt (last buffer-undo-list))
+ ;; `elt' is not in the log any more, but that's because
+ ;; the log is "all new", so we should remove all
+ ;; boundaries from it.
+ (not (eq (last buffer-undo-list) (last old-cdr))))
+ (cl-callf (lambda (x) (delq nil x))
+ (if (car buffer-undo-list)
+ buffer-undo-list
+ ;; Preserve the undo-boundaries at either ends of the
+ ;; change-groups.
+ (cdr buffer-undo-list)))))
+ ;; Reset the modified cons cell ELT to its original content.
+ (when (consp elt)
+ (setcar elt old-car)
+ (setcdr elt old-cdr))))))))
+
+
(defcustom undo-ask-before-discard nil
"If non-nil ask about discarding undo info for the current command.
Normally, Emacs discards the undo info for the current command if
"Execute string COMMAND in inferior shell; display output, if any.
With prefix argument, insert the COMMAND's output at point.
+Interactively, prompt for COMMAND in the minibuffer.
+
If COMMAND ends in `&', execute it asynchronously.
The output appears in the buffer `*Async Shell Command*'.
That buffer is in shell mode. You can also use
The optional second argument OUTPUT-BUFFER, if non-nil,
says to put the output in some other buffer.
-If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
-If OUTPUT-BUFFER is not a buffer and not nil,
-insert output in current buffer. (This cannot be done asynchronously.)
-In either case, the buffer is first erased, and the output is
-inserted after point (leaving mark after it).
+If OUTPUT-BUFFER is a buffer or buffer name, erase that buffer
+and insert the output there.
+If OUTPUT-BUFFER is not a buffer and not nil, insert the output
+in current buffer after point leaving mark after it.
+This cannot be done asynchronously.
If the command terminates without error, but generates output,
and you did not specify \"insert it in the current buffer\",
(current-buffer)))))
;; Output goes in a separate buffer.
;; Preserve the match data in case called from a program.
+ ;; FIXME: It'd be ridiculous for an Elisp function to call
+ ;; shell-command and assume that it won't mess the match-data!
(save-match-data
(if (string-match "[ \t]*&[ \t]*\\'" command)
;; Command ending with ampersand means asynchronous.
(shell-command-on-region (point) (point) command
output-buffer nil error-buffer)))))))
-(defun display-message-or-buffer (message
- &optional buffer-name not-this-window frame)
+(defun display-message-or-buffer (message &optional buffer-name action frame)
"Display MESSAGE in the echo area if possible, otherwise in a pop-up buffer.
MESSAGE may be either a string or a buffer.
-A buffer is displayed using `display-buffer' if MESSAGE is too long for
-the maximum height of the echo area, as defined by `max-mini-window-height'
+A pop-up buffer is displayed using `display-buffer' if MESSAGE is too long
+for maximum height of the echo area, as defined by `max-mini-window-height'
if `resize-mini-windows' is non-nil.
Returns either the string shown in the echo area, or when a pop-up
string and it is displayed in the echo area, it is not specified whether
the contents are inserted into the buffer anyway.
-Optional arguments NOT-THIS-WINDOW and FRAME are as for `display-buffer',
-and only used if a buffer is displayed."
+Optional arguments ACTION and FRAME are as for `display-buffer',
+and are only used if a pop-up buffer is displayed."
(cond ((and (stringp message) (not (string-match "\n" message)))
;; Trivial case where we can use the echo area
(message "%s" message))
(t
;; Buffer
(goto-char (point-min))
- (display-buffer (current-buffer)
- not-this-window frame))))))))
+ (display-buffer (current-buffer) action frame))))))))
;; We have a sentinel to prevent insertion of a termination message
Optional fourth arg OUTPUT-BUFFER specifies where to put the
command's output. If the value is a buffer or buffer name,
-put the output there. If the value is nil, use the buffer
-`*Shell Command Output*'. Any other value, excluding nil,
-means to insert the output in the current buffer. In either case,
-the output is inserted after point (leaving mark after it).
+erase that buffer and insert the output there.
+If the value is nil, use the buffer `*Shell Command Output*'.
+Any other non-nil value means to insert the output in the
+current buffer after START.
Optional fifth arg REPLACE, if non-nil, means to insert the
output in place of text from START to END, putting point and mark
(define-derived-mode process-menu-mode tabulated-list-mode "Process Menu"
"Major mode for listing the processes called by Emacs."
(setq tabulated-list-format [("Process" 15 t)
+ ("PID" 7 t)
("Status" 7 t)
("Buffer" 15 t)
("TTY" 12 t)
(defun process-menu-delete-process ()
"Kill process at point in a `list-processes' buffer."
(interactive)
- (delete-process (tabulated-list-get-id))
- (revert-buffer))
+ (let ((pos (point)))
+ (delete-process (tabulated-list-get-id))
+ (revert-buffer)
+ (goto-char (min pos (point-max)))
+ (if (eobp)
+ (forward-line -1)
+ (beginning-of-line))))
(defun list-processes--refresh ()
"Recompute the list of processes for the Process List buffer.
(process-query-on-exit-flag p))
(let* ((buf (process-buffer p))
(type (process-type p))
+ (pid (if (process-id p) (format "%d" (process-id p)) "--"))
(name (process-name p))
(status (symbol-name (process-status p)))
(buf-label (if (buffer-live-p buf)
(format " at %s b/s" speed)
"")))))
(mapconcat 'identity (process-command p) " "))))
- (push (list p (vector name status buf-label tty cmd))
+ (push (list p (vector name pid status buf-label tty cmd))
tabulated-list-entries))))))
(defun process-menu-visit-buffer (button)
(setq prefix-command--last-echo nil)
(defun internal-echo-keystrokes-prefix ()
- ;; BEWARE: Called directly from the C code.
+ ;; BEWARE: Called directly from C code.
+ ;; If the return value is non-nil, it means we are in the middle of
+ ;; a command with prefix, such as a command invoked with prefix-arg.
(if (not prefix-command--needs-update)
prefix-command--last-echo
(setq prefix-command--last-echo
This respects the wrapper hook `filter-buffer-substring-functions',
and the abnormal hook `buffer-substring-filters'.
No filtering is done unless a hook says to."
- (with-wrapper-hook filter-buffer-substring-functions (beg end delete)
+ (subr--with-wrapper-hook-no-warnings
+ filter-buffer-substring-functions (beg end delete)
(cond
((or delete buffer-substring-filters)
(save-excursion
If you want to append the killed region to the last killed text,
use \\[append-next-kill] before \\[kill-region].
+Any command that calls this function is a \"kill command\".
+If the previous command was also a kill command,
+the text killed this time appends to the text killed last time
+to make one entry in the kill ring.
+
+The killed text is filtered by `filter-buffer-substring' before it is
+saved in the kill ring, so the actual saved text might be different
+from what was killed.
+
If the buffer is read-only, Emacs will beep and refrain from deleting
the text, but put the text in the kill ring anyway. This means that
you can use the killing commands to copy text from a read-only buffer.
Lisp programs should use this function for killing text.
(To delete text, use `delete-region'.)
-Supply two arguments, character positions indicating the stretch of text
- to be killed.
-Any command that calls this function is a \"kill command\".
-If the previous command was also a kill command,
-the text killed this time appends to the text killed last time
-to make one entry in the kill ring.
-
-The optional argument REGION if non-nil, indicates that we're not just killing
-some text between BEG and END, but we're killing the region."
+Supply two arguments, character positions BEG and END indicating the
+ stretch of text to be killed. If the optional argument REGION is
+ non-nil, the function ignores BEG and END, and kills the current
+ region instead."
;; Pass mark first, then point, because the order matters when
;; calling `kill-append'.
(interactive (list (mark) (point) 'region))
If `interprogram-cut-function' is non-nil, also save the text for a window
system cut and paste.
-The optional argument REGION if non-nil, indicates that we're not just copying
-some text between BEG and END, but we're copying the region.
+The copied text is filtered by `filter-buffer-substring' before it is
+saved in the kill ring, so the actual saved text might be different
+from what was in the buffer.
+
+When called from Lisp, save in the kill ring the stretch of text
+between BEG and END, unless the optional argument REGION is
+non-nil, in which case ignore BEG and END, and save the current
+region instead.
This command's old key binding has been given to `kill-ring-save'."
;; Pass mark first, then point, because the order matters when
If you want to append the killed line to the last killed text,
use \\[append-next-kill] before \\[kill-ring-save].
-The optional argument REGION if non-nil, indicates that we're not just copying
-some text between BEG and END, but we're copying the region.
+The copied text is filtered by `filter-buffer-substring' before it is
+saved in the kill ring, so the actual saved text might be different
+from what was in the buffer.
+
+When called from Lisp, save in the kill ring the stretch of text
+between BEG and END, unless the optional argument REGION is
+non-nil, in which case ignore BEG and END, and save the current
+region instead.
This command is similar to `copy-region-as-kill', except that it gives
visual feedback indicating the extent of the region being copied."
(defmacro save-mark-and-excursion (&rest body)
"Like `save-excursion', but also save and restore the mark state.
This macro does what `save-excursion' did before Emacs 25.1."
+ (declare (indent 0) (debug t))
(let ((saved-marker-sym (make-symbol "saved-marker")))
`(let ((,saved-marker-sym (save-mark-and-excursion--save)))
(unwind-protect
(defcustom use-empty-active-region nil
"Whether \"region-aware\" commands should act on empty regions.
-If nil, region-aware commands treat empty regions as inactive.
+If nil, region-aware commands treat the empty region as inactive.
If non-nil, region-aware commands treat the region as active as
long as the mark is active, even if the region is empty.
(/ (float (- (nth 3 edges) (nth 1 edges))) dlh)))
;; Returns non-nil if partial move was done.
-(defun line-move-partial (arg noerror to-end)
+(defun line-move-partial (arg noerror &optional _to-end)
(if (< arg 0)
;; Move backward (up).
;; If already vscrolled, reduce vscroll
;; discrepancies between that and DLH.
(if (and rowh rbot (>= (- (+ rowh rbot) winh) 1))
(set-window-vscroll nil dlh t))
- (line-move-1 arg noerror to-end)
+ (line-move-1 arg noerror)
t)
;; If there are lines above the last line, scroll-up one line.
((and vpos (> vpos 0))
;; scrolling with cursor motion. But so far we don't have
;; a cleaner solution to the problem of making C-n do something
;; useful given a tall image.
-(defun line-move (arg &optional noerror to-end try-vscroll)
+(defun line-move (arg &optional noerror _to-end try-vscroll)
"Move forward ARG lines.
If NOERROR, don't signal an error if we can't move ARG lines.
TO-END is unused.
`auto-window-vscroll' or TRY-VSCROLL is nil, this function will
not vscroll."
(if noninteractive
- (line-move-1 arg noerror to-end)
+ (line-move-1 arg noerror)
(unless (and auto-window-vscroll try-vscroll
;; Only vscroll for single line moves
(= (abs arg) 1)
;; But don't vscroll in a keyboard macro.
(not defining-kbd-macro)
(not executing-kbd-macro)
- (line-move-partial arg noerror to-end))
+ (line-move-partial arg noerror))
(set-window-vscroll nil 0 t)
(if (and line-move-visual
;; Display-based column are incompatible with goal-column.
(set-window-vscroll
nil
(- lh dlh) t))))
- (line-move-1 arg noerror to-end)))))
+ (line-move-1 arg noerror)))))
;; Display-based alternative to line-move-1.
;; Arg says how many lines to move. The value is t if we can move the
(setq temporary-goal-column
(cons (/ (float x-pos)
(frame-char-width))
- hscroll))))))
+ hscroll)))
+ (executing-kbd-macro
+ ;; When we move beyond the first/last character visible in
+ ;; the window, posn-at-point will return nil, so we need to
+ ;; approximate the goal column as below.
+ (setq temporary-goal-column
+ (mod (current-column) (window-text-width)))))))
(if target-hscroll
(set-window-hscroll (selected-window) target-hscroll))
;; vertical-motion can move more than it was asked to if it moves
rather than trying to keep the same horizontal position.
With a non-nil argument ARG, clears out the goal column
so that \\[next-line] and \\[previous-line] resume vertical motion.
-The goal column is stored in the variable `goal-column'."
+The goal column is stored in the variable `goal-column'.
+This is a buffer-local setting."
(interactive "P")
(if arg
(progn
(defun backward-word (&optional arg)
"Move backward until encountering the beginning of a word.
With argument ARG, do this that many times.
-If ARG is omitted or nil, move point backward one word."
+If ARG is omitted or nil, move point backward one word.
+
+The word boundaries are normally determined by the buffer's syntax
+table, but `find-word-boundary-function-table', such as set up
+by `subword-mode', can change that. If a Lisp program needs to
+move by words determined strictly by the syntax table, it should
+use `backward-word-strictly' instead."
(interactive "^p")
(forward-word (- (or arg 1))))