onews

windows版本的emacs

*** There is a new data type called a char-table which is an array
indexed by a character.  Currently this is mostly equivalent to a
vector of length 256, but in the future, when a wider character set is
in use, it will be different.  To create one, call
   (make-char-table SUBTYPE INITIAL-VALUE)

SUBTYPE is a symbol that identifies the specific use of this
character table.  It can be any of these values:

  syntax-table
  display-table
  keyboard-translate-table
  case-table

The function `char-table-subtype' returns the subtype of a char-table.
You cannot alter the subtype of an existing char-table.

A char-table has an element for each character code.  It also has some
"extra slots".  The number of extra slots depends on the subtype and
their use depends on the subtype.  (Each subtype symbol has a
`char-table-extra-slots' property that says how many extra slots to
make.)  Use (char-table-extra-slot TABLE N) to access extra slot N and
(set-char-table-extra-slot TABLE N VALUE) to store VALUE in slot N.

A char-table T can have a parent, which should be another char-table
P.  If you look for the value in T for character C, and the table T
actually holds nil, P's element for character C is used instead.
The functions `char-table-parent' and `set-char-table-parent'
let you read or set the parent of a char-table.

To scan all the values in a char-table, do not try to loop through all
possible character codes.  That would work for now, but will not work
in the future.  Instead, call map-char-table.  (map-char-table
FUNCTION TABLE) calls FUNCTION once for each character or character
set that has a distinct value in TABLE.  FUNCTION gets two arguments,
RANGE and VALUE.  RANGE specifies a range of TABLE that has one
uniform value, and VALUE is the value in TABLE for that range.

Currently, RANGE is always a vector containing a single character
and it refers to that character alone.  In the future, other kinds
of ranges will occur.  You can set the value for a given range
with (set-char-table-range TABLE RANGE VALUE) and examine the value
for a range with (char-table-range TABLE RANGE).

*** Syntax tables are now represented as char-tables.
All syntax tables other than the standard syntax table
normally have the standard syntax table as their parent.
Their subtype is `syntax-table'.

*** Display tables are now represented as char-tables.
Their subtype is `display-table'.

*** Case tables are now represented as char-tables.
Their subtype is `case-table'.

*** The value of keyboard-translate-table may now be a char-table
instead of a string.  Normally the char-tables used for this purpose
have the subtype `keyboard-translate-table', but that is not required.

*** A new data type called a bool-vector is a vector of values
that are either t or nil.  To create one, do
   (make-bool-vector LENGTH INITIAL-VALUE)

** You can now specify, for each marker, how it should relocate when
text is inserted at the place where the marker points.  This is called
the "insertion type" of the marker.

To set the insertion type, do (set-marker-insertion-type MARKER TYPE).
If TYPE is t, it means the marker advances when text is inserted.  If
TYPE is nil, it means the marker does not advance.  (In Emacs 19.29,
markers did not advance.)

The function marker-insertion-type reports the insertion type of a
given marker.  The function copy-marker takes a second argument TYPE
which specifies the insertion type of the new copied marker.

** When you create an overlay, you can specify the insertion type of
the beginning and of the end.  To do this, you can use two new
arguments to make-overlay: front-advance and rear-advance.

** The new function overlays-in returns a list of the overlays that
overlap a specified range of the buffer.  The returned list includes
empty overlays at the beginning of this range, as well as within the
range.

** The new hook window-scroll-functions is run when a window has been
scrolled.  The functions in this list are called just before
redisplay, after the new window-start has been computed.  Each function
is called with two arguments--the window that has been scrolled, and its
new window-start position.

This hook is useful for on-the-fly fontification and other features
that affect how the redisplayed text will look when it is displayed.

The window-end value of the window is not valid when these functions
are called.  The computation of window-end is byproduct of actual
redisplay of the window contents, which means it has not yet happened
when the hook is run.  Computing window-end specially in advance for
the sake of these functions would cause a slowdown.

The hook functions can determine where the text on the window will end
by calling vertical-motion starting with the window-start position.

** The new hook redisplay-end-trigger-functions is run whenever
redisplay in window uses text that extends past a specified end
trigger position.  You set the end trigger position with the function
set-window-redisplay-end-trigger.  The functions are called with two
arguments: the window, and the end trigger position.  Storing nil for
the end trigger position turns off the feature, and the trigger value
is automatically reset to nil just after the hook is run.

You can use the function window-redisplay-end-trigger to read a
window's current end trigger value.

** The new function insert-file-contents-literally inserts the
contents of a file without any character set translation or decoding.

** The new function safe-length computes the length of a list.
It never gets an error--it treats any non-list like nil.
If given a circular list, it returns an upper bound for the number
of elements before the circularity.

** replace-match now takes a fifth argument, SUBEXP.  If SUBEXP is
non-nil, that says to replace just subexpression number SUBEXP of the
regexp that was matched, not the entire match.  For example, after
matching `foo \(ba*r\)' calling replace-match with 1 as SUBEXP means
to replace just the text that matched `\(ba*r\)'.

** The new keymap special-event-map defines bindings for certain
events that should be handled at a very low level--as soon as they
are read.  The read-event function processes these events itself,
and never returns them.

Events that are handled in this way do not echo, they are never
grouped into key sequences, and they never appear in the value of
last-command-event or (this-command-keys).  They do not discard a
numeric argument, they cannot be unread with unread-command-events,
they may not appear in a keyboard macro, and they are not recorded
in a keyboard macro while you are defining one.

These events do, however, appear in last-input-event immediately after
they are read, and this is the way for the event's definition to find
the actual event.

The events types iconify-frame, make-frame-visible and delete-frame
are normally handled in this way.

** encode-time now supports simple date arithmetic by means of
out-of-range values for its SEC, MINUTE, HOUR, DAY, and MONTH
arguments; for example, day 0 means the day preceding the given month.
Also, the ZONE argument can now be a TZ-style string.

** command-execute and call-interactively now accept an optional third
argument KEYS.  If specified and non-nil, this specifies the key
sequence containing the events that were used to invoke the command.

** The environment variable NAME, if set, now specifies the value of
(user-full-name), when Emacs starts up.

* User Editing Changes in Emacs 19.29

** If you run out of memory.

If you get the error message "Virtual memory exhausted", type C-x s.
That way of saving files has the least additional memory needs.  Emacs
19.29 keeps a reserve of memory which it makes available when this
error happens; that is to ensure that C-x s can complete its work.

Once you have saved your data, you can exit and restart Emacs, or use
M-x kill-some-buffers to free up space.  If you kill buffers
containing a substantial amount of text, you can go on editing.

Do not use M-x buffer-menu to save or kill buffers when you are out of
memory, because that needs a fair amount memory itself and you may not
have enough to get it started.

** The format of compiled files has changed incompatibly.

Byte-compiled files made with Emacs 19.29 normally use a new format
that will not work in older Emacs versions.  You can compile files
in the old format if you wish; see "Changes in compilation," below.

** Emacs 19.29 supports the DEC Alpha.

** Emacs runs on Windows NT.

This port does not yet support windowing features.  It works like a
text-only terminal, but it does support a mouse.

In general, support for non-GNU-like operating systems is not a high
priority for the GNU project.  We merged in the support for Windows NT
because that system is expected to be very widely used.

** Emacs supports Motif widgets.

You can build Emacs with Motif widgets by specifying --with-x-toolkit=motif
when you run configure.

Motif defines collections of windows called "tab groups", and uses the
tab key and the cursor keys to move between windows in a tab group.
Emacs naturally does not support this--it has other uses for the tab
key and cursor keys.  Emacs does not support Motif accelerators either,
because it uses its normal keymap event binding features.

We give higher priority to operation with a free widget set than to
operation with a proprietary one.

** If Emacs or the computer crashes, you can recover all the files you
were editing from their auto save files by typing M-x recover-session.
This first shows you a list of recorded interrupted sessions.  Move
point to the one you choose, and type C-c C-c.

Then recover-session asks about each of the files that were being
edited during that session, asking whether to recover that file.  If
you answer y, it calls recover-file, which works in its normal
fashion.  It shows the dates of the original file and its auto-save
file and asks once again whether to recover that file.

When recover-session is done, the files you've chosen to recover
are present in Emacs buffers.  You should then save them.
Only this--saving them--updates the files themselves.

** Menu bar menus now stay up if you click on the menu bar item and
release the mouse button within a certain amount of time.  This is in
the X Toolkit version.

** The menu bar menus have been rearranged and split up to make for a
better organization.  Two new menu bar menus, Tools and Search,
contain items that were formerly in the Files and Edit menus, as well
as some that did not exist in the menu bar menus before.

** Emacs can now display on more than one X display at the same time.
Use the command make-frame-on-display to create a frame, specifying
which display to use.

** M-x talk-connect sets up a multi-user talk connection
via Emacs.  Specify the X display of the person you want to talk to.
You can talk to any number of people (within reason) by using
this command repeatedly to specify different people.

Emacs does not make a fuss about security; the people who you talk to
can use all Emacs features, including visiting and editing files.  If
this frightens you, don't use M-x talk-connect.

** The range of integer values is now at least 2**28 on all machines.
This means the maximum size of a buffer is at least 2**27-1,
or 134,217,727.

** When you start Emacs, you can now specify option names in
long GNU form (starting with `--') and you can abbreviate the names.

You can now specify the options in any order.
The previous requirements about the order of options
have been eliminated.

The -L or --directory option lets you specify an additional
directory to search for Lisp libraries (including libraries
that you specify with the -l or --load options).

** Incremental search in Transient Mark mode, if the mark is already
active, now leaves the mark active and does not change its position.
You can make incremental search deactivate the mark once again with
this expression.

    (add-hook 'isearch-mode-hook 'deactivate-mark)

** C-delete now deletes a word backwards.  This is for compatibility
with some editors in the PC world.  (This key is not available on
ordinary ASCII terminals, because C-delete is not a distinct character
on those terminals.)

** ESC ESC ESC is now a command to escape from various temporary modes
and states.

** M-x pc-bindings-mode sets up bindings compatible with many PC editors.
In particular, Delete and its variants delete forward instead of backward.
Use Backspace to delete backward.

C-Backspace kills backward a word (as C-Delete normally would).
M-Backspace does undo.
Home and End move to beginning and end of line
C-Home and C-End move to beginning and end of buffer.

** The key sequence for evaluating a Lisp expression using the minibuffer
is now ESC :.  It used to be ESC ESC, but we moved it to make way for
the ESC ESC ESC feature, on the grounds that people who evaluate Lisp
expressions are experienced users and can cope with a change.
If you prefer the old ESC ESC binding, put in your `~/.emacs':

	(global-set-key "\e\e" 'eval-expression)

** The f1 function key is now equivalent to the help key.  This is
done with key-translation-map; delete the binding for f1 in that map
if you want to use f1 for something else.

** Mouse-3, in the simplest case, still sets the region.  But now, it
places the mark where point was, and sets point where you click.
(It used to set the mark where you click and leave point alone.)

If you position point with Mouse-1, then scroll with the scroll bar
and use Mouse-3, Mouse-3 uses the position you specified with Mouse-1
even if it has scrolled off the screen (and point is no longer there).
This makes it easier to select a region with the mouse which is bigger
than a screenful.

Any editing of the buffer, and any cursor motion or scrolling for any
reason other than the scroll bar, cancels the special state set up by
Mouse-1--so that a subsequent Mouse-3 click will use the actual value
of point.

** C-mouse-3 now pops up a mode-specific menu of commands--normally
the same ones available in the mode's own menu bar menus.

** C-mouse-2 now pops up a menu of faces, indentation, justification,
and certain other text properties.  This menu is also available
through the menu-bar Edit menu.  It is meant for use with Enriched
mode.

*** You can use this