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GNU Emacs NEWS -- history of user-visible changes.
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Copyright (C) 2010-2013 Free Software Foundation, Inc.
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See the end of the file for license conditions.
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Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
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If possible, use M-x report-emacs-bug.

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This file is about changes in Emacs version 24.
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See files NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
and NEWS.1-17 for changes in older Emacs versions.
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You can narrow news to a specific version by calling `view-emacs-news'
with a prefix argument or by typing C-u C-h C-n.
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Temporary note:
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+++ indicates that all necessary updates to the manuals in doc/ are complete.
--- means no change in the manuals is needed.
When you add a new item, use the appropriate mark if you know it applies,
otherwise leave it unmarked.
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* Installation Changes in Emacs 24.4
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** Emacs can now be compiled with ACL support.
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This happens by default if a suitable support library is found at
build time, like libacl on GNU/Linux.  To prevent this, use the
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configure option `--disable-acl'.
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** Emacs can now be compiled with file notification support.
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This happens by default if a suitable system library is found at
build time.  To prevent this, use the configure option
`--with-file-notification-no'.  See below for file-notify features.
FIXME?  This feature is not available for the Nextstep port. (?)
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** The configure option `--without-compress-info' has been generalized,
and renamed to `--without-compress-install'.  It now prevents compression
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of _any_ files during installation.

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** The configure option `--with-crt-dir' has been removed.
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It is no longer needed, as the crt*.o files are no longer linked
specially.

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** Directories passed to configure option `--enable-locallisppath' are
no longer created during installation.

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** Emacs can be compiled with zlib support.
If this library is present (which it normally is on most systems), the
function `zlib-decompress-region' becomes available, which can
decompress gzip- and zlib-format compressed data.
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---
** Emacs for NS (OSX, GNUStep) can be built with ImageMagick support.
pkg-config is required to find ImageMagick libraries.

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** For OSX >= 10.5, the Core text based font backend from the Mac port is used.
For GNUStep and OSX 10.4 the old backend is used.
To use the old backend by default, do on the command line:
% defaults write org.gnu.Emacs FontBackend ns

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* Startup Changes in Emacs 24.4
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** When initializing `load-path', an empty element in the EMACSLOADPATH
environment variable (either leading, e.g., ":/foo"; trailing, e.g.,
"/foo:"; or embedded, e.g., "/foo::/bar") is replaced with the default
load-path (the one that would have been used if EMACSLOADPATH was unset).
This makes it easier to _extend_ the load-path via EMACSLOADPATH
(previously, EMACSLOADPATH had to specify the complete load-path,
including the defaults).  (In older versions of Emacs, an empty element
was replaced by ".", so use an explicit "." now if that is what you want.)

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** The -L option, which normally prepends its argument to load-path,
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will instead append, if the argument begins with `:' (or `;' on MS Windows;
i.e., `path-separator').
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** If you use either site-load.el or site-init.el to customize the dumped
Emacs executable, any changes to `load-path' that these files make
will no longer be present after dumping.  To affect a permanent change
to `load-path', use the `--enable-locallisppath' option of `configure'.

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** The user option `initial-buffer-choice' can now specify a function
to set up the initial buffer.

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* Changes in Emacs 24.4
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** Emacs now supports menus on text-mode terminals.
If the terminal supports a mouse, clicking on the menu bar, or on
sensitive portions of the mode line or header line, will drop down the
menu defined at that position.  Likewise, clicking C-mouse-2 or
C-mouse-2 or C-mouse-3 on the text area will pop up the menus defined
for those locations.

If the text terminal does not support a mouse, you can activate the
first menu-bar menu by typing F10, which invokes `menu-bar-open'.

If you want the previous behavior, whereby F10 invoked `tmm-menubar',
customize the option `tty-menu-open-use-tmm' to a non-nil value.
(Typing M-` will always invoke `tmm-menubar', even if
`tty-menu-open-use-tmm' is nil.)

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** The *Messages* buffer is created in `messages-buffer-mode',
a new major mode, with read-only status.  Any code that might create
the *Messages* buffer should call the function `messages-buffer' to do
so and set up the mode.
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** Emacs now supports ACLs (access control lists).
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*** Emacs preserves the ACL entries of files when backing up.
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*** New functions `file-acl' and `set-file-acl' get and set the ACL
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entries of a file.  On GNU/Linux, the POSIX ACL interface is used via
libacl.  On MS-Windows, the NT Security APIs are used to emulate the
POSIX ACL interfaces.
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** Multi-monitor support has been added.

*** New functions `display-monitor-attributes-list' and
`frame-monitor-attributes' can be used to obtain information about
each physical monitor on multi-monitor setups.

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*** The functions `display-pixel-width' and `display-pixel-height' now
behave consistently among the platforms: they return the pixel width
or height for all physical monitors associated with the given display
as just they were on X11.  To get information for each physical
monitor, use the new functions above.  Similar notes also apply to
`x-display-pixel-width', `x-display-pixel-height', `display-mm-width',
`display-mm-height', `x-display-mm-width', and `x-display-mm-height'.

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** The cursor stops blinking after 10 blinks (by default) on X and NS.
You can change the default by customizing `blink-cursor-blinks'.
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** In keymaps where SPC scrolls forward, S-SPC now scrolls backward.
This affects View mode, etc.

** Help changes
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*** The command `apropos-variable' is renamed to `apropos-user-option'.
`apropos-user-option' shows all user options while `apropos-variable'
shows all variables.  When called with a universal prefix argument,
the two commands swap their behaviors.  When `apropos-do-all' is
non-nil, they output the same results.
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*** The key `?' now describes prefix bindings, like `C-h'.
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*** The command `quail-help' is deleted.  Use `C-h C-\'
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(`describe-input-method') instead.

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** Frame and window changes
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*** New commands `toggle-frame-fullscreen' and `toggle-frame-maximized',
bound to <f11> and M-<f10>, respectively.
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*** New command `frameset-to-register' is now bound to `C-x r f', replacing
`frame-configuration-to-register'.  It offers similar functionality,
plus enhancements like the ability to restore deleted frames.  The
command `frame-configuration-to-register' still exists, but is unbound.
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*** New hooks `focus-in-hook', `focus-out-hook'.
These are normal hooks run when an Emacs frame gains or loses input focus.

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*** `split-window' is now a non-interactive function, not a command.
As a command, it was a special case of `C-x 2' (`split-window-below'),
and as such superfluous.  After being reimplemented in Lisp, its
interactive form was mistakenly retained.
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*** New option `scroll-bar-adjust-thumb-portion'.
Available only on X, this option allows to control over-scrolling
using the scroll bar (i.e. dragging the thumb down even when the end
of the buffer is visible).

** Lisp evaluation changes
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*** `eval-defun' on an already defined defcustom calls the :set function,
if there is one.

*** A zero prefix arg of `eval-last-sexp' (`C-x C-e'),
`eval-expression' (`M-:') and `eval-print-last-sexp' (`C-j') inserts
a list with no limit on its length and level (by using nil values of
`print-length' and `print-level'), and inserts additional formats for
integers (octal, hexadecimal, and character).

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** `write-region-inhibit-fsync' now defaults to t in batch mode.
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** `cache-long-line-scans' has been renamed to `cache-long-scans'
because it affects caching of paragraph scanning results as well.
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---
** The option `set-mark-default-inactive' has been deleted.
This unfinished feature was introduced by accident in Emacs 23.1;
simply disabling Transient Mark mode does the same thing.

** The default value of `comment-use-global-state' is changed to t,
and this variable has been marked obsolete.


* Editing Changes in Emacs 24.4

** Indentation changes

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*** The behavior of `C-x TAB' (`indent-rigidly') has changed.
When invoked without a prefix argument, it now activates a transient
mode in which typing <left>, <right>, <S-left>, and <S-right> adjusts
the text indentation in the region.  Typing any other key resumes
normal editing behavior.
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*** `electric-indent-mode' is enabled by default.
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*** `tab-stop-list' is now implicitly extended to infinity by repeating
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the last step.  Its default value is changed to nil which means a tab
stop every `tab-width' columns.
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** Filling changes
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*** New command `cycle-spacing' cycles between spacing conventions:
having just one space, no spaces, or reverting to the original
spacing.  Like `just-one-space', it can handle or ignore newlines and
leave different number of spaces.

*** `fill-single-char-nobreak-p' prevents fill from breaking a line after
a 1-letter word, which is an error according to Polish and
Czech typography rules.  To globally enable this feature, evaluate:

  (add-hook 'fill-nobreak-predicate 'fill-single-char-nobreak-p)
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** Uniquify is enabled by default with `post-forward-angle-brackets' style.

** New command `C-x SPC' (`rectangle-mark-mode') makes a rectangular region.
Most commands are still unaware of it, but kill/yank do work on the rectangle.
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** New option `visual-order-cursor-movement'.
If this is non-nil, cursor motion with arrow keys will follow the
visual order of characters on the screen: <left> always moves to the
left, <right> always moves to the right, disregarding the surrounding
bidirectional context.

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** Register changes
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*** All register commands can now show help with preview.
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*** New command `C-x C-k x' (`kmacro-to-register') stores keyboard
macros in registers.
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*** New command `C-x r f' (`frameset-to-register').
See Changes in Emacs 24.4, above.

** New command `delete-duplicate-lines'.
When its arg ADJACENT is non-nil (when called interactively with C-u
C-u) it works like the utility `uniq'.  Otherwise by default it
deletes duplicate lines everywhere in the region without regard to
adjacency.  When its arg KEEP-BLANKS is non-nil (when called
interactively with C-u C-u C-u), duplicate blank lines are preserved.
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* Changes in Specialized Modes and Packages in Emacs 24.4
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** More packages look for ~/.emacs.d/<foo> additionally to ~/.<foo>.
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Affected files:
~/.emacs.d/timelog	replaces  ~/.timelog
~/.emacs.d/vip		replaces  ~/.vip
~/.emacs.d/viper	replaces  ~/.viper
~/.emacs.d/ido.last	replaces  ~/.ido.last
~/.emacs.d/kkcrc	replaces  ~/.kkcrc
~/.emacs.d/quickurls	replaces  ~/.quickurls
~/.emacs.d/idlwave	replaces  ~/.idlwave
~/.emacs.d/bdfcache.el	replaces  ~/.bdfcache.el
~/.emacs.d/places	replaces  ~/.emacs-places
~/.emacs.d/shadows	replaces  ~/.shadows
~/.emacs.d/shadow_todo	replaces  ~/.shadow_todo
~/.emacs.d/strokes	replaces  ~/.strokes
~/.emacs.d/notes	replaces  ~/.notes
~/.emacs.d/type-break	replaces  ~/.type-break
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Also the following files used by the now obsolete otodo-mode.el:
~/.emacs.d/todo-do	replaces  ~/.todo-do
~/.emacs.d/todo-done	replaces  ~/.todo-done
~/.emacs.d/todo-top	replaces  ~/.todo-top

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** Backtrace and debugger
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*** The Lisp debugger's `e' command now includes the lexical environment
when evaluating the code in the context at point.  Hence, it now lets
you access lexical variables.
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*** New command `v' (`debugger-toggle-locals') displays local vars.
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*** New minor mode `jit-lock-debug-mode' lets you use the debuggers on
code run via JIT Lock.
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** Battery

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---
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*** Battery information via the BSD `apm' utility is now supported.

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** Buffer Menu

*** `M-s a C-o' shows lines matching a regexp in marked buffers using Occur.

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** Calendar and Diary

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---
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*** New faces `calendar-weekday-header', `calendar-weekend-header',
and `calendar-month-header'.
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*** New option `calendar-day-header-array'.

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*** New variable `diary-from-outlook-function', used by the command
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`diary-from-outlook'.

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*** The variable `calendar-font-lock-keywords' is obsolete.
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** Calc

*** Calc by default now uses the Gregorian calendar for all dates, and
uses January 1, 1 AD as its day number 1.  Previously Calc used the
Julian calendar for dates before September 14, 1752, and it used
December 31, 1 BC as its day number 1; the new scheme is more
consistent with Calendar's calendrical system and day numbering.

*** The new variable `calc-gregorian-switch' lets you configure the
date when Calc switches from the Julian to the Gregorian calendar.
Nil, the default value, means to always use the Gregorian calendar.
The value (YEAR MONTH DAY) means to start using the Gregorian calendar
on the given date.

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*** Support for ISO 8601 dates.

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** CEDET

*** EDE

**** The cpp-root project now supports executing a compile command.
It can be set through the new :compile-command slot or the
buffer-local variable `compile-command'.

**** Better selection of include directories for the 'linux' project.
Include directories now support out-of-tree build directories and
target architecture auto-detection.

*** Semantic

**** Improved detection of used namespaces in current scope in C++.

**** Parsing of default values for variables and function arguments in C/C++.
They are also displayed by the summarize feature in the modeline.

**** Improved parsing of function pointers in C/C++.
This also includes parsing of function pointers as function arguments.

**** Parsing of C/C++ preprocessor macros which open new scope.
For example, this enables parsing of macros which open new namespaces.

**** Support for 'this' pointer in inline member functions in C++.

** cl-lib

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*** New macro `cl-tagbody'.
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+++
*** letf is now just an alias for cl-letf.

** CUA mode

*** CUA mode was changed to make use of delete-selection-mode and
shift-select-mode.  So you can now enable it independently from
transient-mark-mode, delete-selection-mode, and shift-select-mode.
As a result, cua-highlight-region-shift-only is obsolete
(you can disable transient-mark-mode to get the same result).

*** CUA's rectangles can now be used via `cua-rectangle-mark-mode'.

** Delete Selection mode can now be used without `transient-mark-mode'.

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** Desktop

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*** `desktop-auto-save-timeout' defines the number of seconds idle time
before auto-save of the desktop.
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*** `desktop-restore-frames', enabled by default, allows saving and
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restoring the frame/window configuration (frameset).  Additional options
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`desktop-restore-in-current-display', `desktop-restore-reuses-frames'
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and `desktop-restore-forces-onscreen' offer further customization.
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** Dired

*** New minor mode `dired-hide-details-mode' hides details.

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** Eldoc Mode works properly in the minibuffer.
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** EPA

*** New option `epa-mail-aliases'.

You can set this to a list of alias expansions for keys to use
in `epa-mail-encrypt'.

If one element of the variable's value is ("foo@bar.com" "foo@hello.org"),
that means: when one of the recipients of the message being encrypted
is `foo@bar.com', encrypt the message for `foo@hello.org' instead.

If one element of the variable's value is ("foo@bar.com"),
that means: when one of the recipients of the message being encrypted
is `foo@bar.com', ignore that name as regards encryption.
This is useful to avoid a query when you have no key for that name.

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** ERC

*** New option `erc-accidental-paste-threshold-seconds'.
If set to a number, this can be used to avoid accidentally paste large
amounts of data into the ERC input.

+++
** ERT

*** New macro `skip-unless' allows skipping ERT tests.
See the ERT manual for details.

** Eshell

+++
*** `eshell' now supports visual subcommands and options
Eshell has been able to handle "visual" commands (interactive,
non-line oriented commands such as top that require display
capabilities not provided by eshell) by running them in an Emacs
terminal emulator.  See `eshell-visual-commands'.

This feature has been extended to subcommands and options that make a
usually line-oriented command a visual command.  Typical examples are
"git log" and "git <command> --help" which display their output in a
pager by default.  See `eshell-visual-subcommands' and
`eshell-visual-options'.

---
*** Added Eshell-Tramp module
External su and sudo commands are now the default; the internal,
Tramp-using variants can still be used by enabling the eshell-tramp
module.

** F90 mode
---
*** New option `f90-smart-end-names'.

** Icomplete is a bit more like Ido.
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*** key bindings to navigate through and select the completions.
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*** The icomplete-separator is customizable, and its default has changed.
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*** Removed icomplete-show-key-bindings.
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*** Icomplete-mode by defaults applies to all forms of minibuffer completion.
(setq icomplete-with-completion-tables '(internal-complete-buffer))
will revert to the old behavior.

** Ido
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*** Ido has a manual now.
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*** `ido-use-virtual-buffers' takes a new value 'auto.
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*** `ido-decorations' has been slightly extended to give a bit more control.

** Image mode

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*** New commands `n' (`image-next-file') and `p' (`image-previous-file')
visit the next image file and the previous image file in the same
directory, respectively.

*** New commands to show specific frames of multi-frame images.
`f' (`image-next-frame') and `b' (`image-previous-frame') visit the
next or previous frame.  `F' (`image-goto-frame') shows a specific frame.

*** New commands to speed up, slow down, or reverse animation.
---
*** The command `image-mode-fit-frame' deletes other windows.
When toggling, it restores the frame's previous window configuration.
It also has an optional frame argument, which can be used by Lisp
callers to fit the image to a frame other than the selected frame.

** Hi-Lock

*** New option `hi-lock-auto-select-face'.  When non-nil, hi-lock commands
will cycle through faces in `hi-lock-face-defaults' without prompting.

+++
*** New global command `M-s h .' (`highlight-symbol-at-point')
highlights the symbol found near point without prompting,
using the next face automatically.

** Imenu

*** New option `imenu-generic-skip-comments-and-strings'.

** Info

*** New face `info-index-match' is used to highlight matches in index
entries displayed by `Info-index-next', `Info-virtual-index' and
`info-apropos'.

** JS Mode

*** Better indentation of multiple-variable declarations.
If declaration spans several lines, variables on the following lines
are lined up to the first one.

*** We now recognize and better indent continuations in array
comprehensions.

*** New option `js-switch-indent-offset`.

** MH-E has been updated to MH-E version 8.5.
See MH-E-NEWS for details.

+++
** Octave mode
*** Font locking for texinfo comments and new keywords
*** Completion in Octave file buffers
*** Eldoc support
*** Jump to definition
*** Documentation lookup/search
*** Code cleanup and various bug fixes

** OPascal mode is the new name for Delphi mode.

*** All delphi-* variables and functions have been renamed to opascal-*.
*** `delphi-newline-always-indents' is not supported any more.
Use `electric-indent-mode' instead.
*** `delphi-tab' is gone, replaced by `indent-for-tab-command'.

** Package

*** The format of `archive-contents' files, generated by package
repositories, has changed to allow a new (fifth) element in the data
vectors, containing an associative list with extra properties.

*** `describe-package' buffer uses the `:url' extra property to
display a `Homepage' header, if it's present.

** Prolog mode
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*** `prolog-use-smie' has been removed, along with the non-SMIE
indentation code.
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** Remember
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*** The new command `remember-notes' creates a buffer which is saved
on `kill-emacs'.
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You may think of it as a *scratch* buffer whose content is preserved.
In fact, it was designed as a replacement for *scratch* buffer and can
be used that way by setting `initial-buffer-choice' to
`remember-notes' and `remember-notes-buffer-name' to "*scratch*".
Without the second change, *scratch* buffer will still be there for
notes that do not need to be preserved.
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*** The Remember package can now store notes in separates files.
You can use the new function `remember-store-in-files' within the
`remember-handler-functions' option.
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See `remember-data-directory' and `remember-directory-file-name-format'
for new options related to this function.
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** Rmail

*** Customize `rmail-mbox-format' to influence some minor aspects of
how Rmail displays non-MIME messages.
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---
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*** The `unrmail' command now converts from BABYL to mboxrd format,
rather than mboxo.  Customize `unrmail-mbox-format' to change this.
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** Ruby mode
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*** New option `ruby-encoding-magic-comment-style'.
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*** New option `ruby-custom-encoding-magic-comment-template'.
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*** New mode menu.
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*** Improved syntax highlighting and indentation.

*** Add more Ruby file types to `auto-mode-alist'.

*** New option `ruby-align-to-stmt-keywords'.
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*** New `electric-indent-mode' integration.

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** Search and Replace
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*** New global command `M-s .' (`isearch-forward-symbol-at-point')
starts a symbol (identifier) incremental search forward with the
symbol found near point added to the search string initially.

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*** `C-x 8 RET' in Isearch mode reads a character by its Unicode name
and adds it to the search string.

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*** `M-s i' in Isearch mode toggles the variable `isearch-invisible'
between nil and the value of the option `search-invisible' (or `open'
when it's nil).
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*** `query-replace' skips invisible text when `search-invisible' is nil,
and opens overlays with hidden text when `search-invisible' is `open'.

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*** A negative prefix arg of replacement commands replaces backward.
`M-- M-%' replaces a string backward, `M-- C-M-%' replaces a regexp
backward, `M-s w words M-- M-%' replaces a sequence of words backward.

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*** By default, prefix arguments do not now terminate Isearch mode.
Set `isearch-allow-prefix' to nil to restore old behavior.

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*** More Isearch commands accept prefix arguments, namely
`isearch-printing-char', `isearch-quote-char', `isearch-yank-word',
`isearch-yank-line'.

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*** Word search now matches whitespace at the beginning/end
of the search string if it contains leading/trailing whitespace.
In an incremental word search or when using a non-nil LAX argument
of `word-search-regexp', the lax matching can also match part of
the first word (in addition to the lax matching of the last word).
The same rules are now applied to the symbol search with the difference
that it matches symbols, and non-symbol characters between symbols.

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** SES
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*** New command `ses-rename-cell' allows assigning names to SES cells.
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** Shell
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*** `explicit-bash-args' now always defaults to use --noediting.
During initialization, Emacs no longer expends a process to decide
whether it is safe to use Bash's --noediting option.  These days
--noediting is ubiquitous; it was introduced in 1996 in Bash version 2.
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*** The SMIE indentation engine is now used by default.

** Shell Script mode
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*** `sh-mode' now has the mode own `add-log-current-defun-function'.
You can pick the name of the function and the variables with `C-x 4 a'.
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** SMIE indentation can be customized via `smie-config'.
The customization can be guessed by Emacs by providing a sample indented
file and letting SMIE learn from it.

** Term mode

*** New option `term-suppress-hard-newline'.
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** Todo mode has been rewritten and enhanced.
New features include:
- support for multiple todo files and archive files of done items;
- renaming, reordering, moving, merging, and deleting categories;
- sortable tabular summaries of categories and the types of items they contain;
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- cross-category lists of items filtered by specific criteria;
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- more fine-grained interaction with the Emacs diary, by being able to decide
  for each todo item whether it appears in the Fancy Diary display;
- highly flexible new item insertion and item editing;
- moving items between categories, storing done items in their category or in
  archive files, undoing or unarchiving done items;
- reprioritizing items by inputting a numerical priority;
- extensive customizability of operation and display, including numerous faces.
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The Todo mode user manual describes all commands and most user options.
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To support some of these features, a new file format is used, which is
incompatible with the old format; however, you can convert old todo and done
item files to the new format on initializing the first new todo file, or at any
later time with the provided conversion command.  The old version of
todo-mode.el has been made obsolete and renamed otodo-mode.el.

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** trace-function was largely rewritten.
New features include:
- no prompting for the destination buffer, unless a prefix-arg was used.
- additionally to prompting for a destination buffer, when a prefix-arg is
  used, the user can enter a "context", i.e. Lisp expression whose value at the
  time the function is entered/exited will be printed along with the function
  name and arguments.  Useful to trace the value of (current-buffer) or
  (point) when the function is invoked.

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** Tramp
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*** The experimental url syntax for remote file names is withdrawn.

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*** New connection method "adb", which allows to access Android
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devices by the Android Debug Bridge.  The variable `tramp-adb-program'
can be used to adapt the path of the "adb" program, if needed.
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*** The connection methods "plink1", "ssh1", "ssh2", "scp1", "scp2",
"scpc" and "rsyncc" are discontinued.  The ssh option
"ControlMaster=auto" is set automatically in all ssh-based methods,
when possible.
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*** Handlers for `file-acl' and `set-file-acl' for remote machines
which support POSIX ACLs.
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*** Handlers for `file-notify-add-watch' and `file-notify-rm-watch'
for remote machines which support filesystem notifications.

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** VC and related modes
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*** In VC directory mode, `D' displays diffs between VC-controlled
whole tree revisions.
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*** In VC directory mode, `L' lists the change log for the current VC
controlled tree in a window.
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*** In VC directory mode, `I' shows a log of changes that will be
received with a pull operation.
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*** `C-x v G' (globally) and `G' (in VC directory mode) ignores a file
under current version control system.  When called with a prefix
argument, you can remove a file from the ignored file list.
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*** `cvs-append-to-ignore' has been renamed to `vc-cvs-append-to-ignore'
because it is moved to vc-cvs.el.
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** VHDL mode
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*** New options: `vhdl-actual-generic-name', `vhdl-beautify-options'.
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*** New commands: `vhdl-fix-statement-region', `vhdl-fix-statement-buffer'.
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** Woman
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*** The commands `woman-default-faces' and `woman-monochrome-faces'
are obsolete.  Customize the `woman-*' faces instead.
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** Obsolete packages:

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*** Iswitchb is made obsolete by icomplete-mode.

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*** longlines.el is obsolete; use visual-line-mode instead.

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*** sup-mouse.el.

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*** terminal.el is obsolete; use term.el instead.

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*** The previous version of todo-mode.el is obsolete and renamed otodo-mode.el.

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*** xesam.el.

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*** yow.el is obsolete; use fortune.el or cookie1.el instead.

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---
*** The Info-edit command is obsolete.  Editing Info nodes by hand
has not been relevant for some time.

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* New Modes and Packages in Emacs 24.4
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** New package `eww' is a built-in web browser.
It is only available if Emacs is compiled with libxml2 support.

** New minor mode `superword-mode', defined in subword.el
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`superword-mode' overrides the default word motion commands to treat
symbol_words as a single word, similar to what `subword-mode' does and
using the same internal functions.

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** New package nadvice.el offers lighter-weight advice facilities.
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It is layered as:
- add-function/remove-function which can be used to add/remove code on any
  function-carrying place, such as process-filters or `<foo>-function' hooks.
- advice-add/advice-remove to add/remove a piece of advice on a named function,
  much like `defadvice' does.

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** New package frameset.el.
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It provides a set of operations to save a frameset (the state of all
or a subset of the existing frames and windows, somewhat similar to a
frame configuration), both in-session and persistently, and restore it
at some point in the future.

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** New package filenotify.el provides an interface for file system
notifications.  It requires that Emacs be compiled with one of the
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low-level libraries gfilenotify.c, inotify.c or w32notify.c.

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* Incompatible Lisp Changes in Emacs 24.4
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** `kill-region' lost its `yank-handler' optional argument.

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** `(input-pending-p)' no longer runs other timers which are ready to
run.  The new optional CHECK-TIMERS param allows for the prior behavior.

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** `defvar' and `defcustom' in a let-binding affect the "external" default.

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** The syntax of ?» and ?« is now punctuation instead of matched parens.
Some languages match those as »...« and others as «...» so better stay neutral.

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** In compiled Lisp files, the header no longer includes a timestamp.

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** The default file coding for Emacs Lisp files is now utf-8.
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(See `file-coding-system-alist'.)  In most cases, this change is
transparent, but files that contain unusual characters without
specifying an explicit coding system may fail to load with obscure
errors.  You should either convert them to utf-8 or add an explicit
`coding:' cookie.
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** `overriding-terminal-local-map' no longer replaces the local keymaps.
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It used to disable the minor mode, major mode, and text-property keymaps,
whereas now it simply has higher precedence.

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** Default process filters and sentinels are not nil any more.
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Instead they default to a function which does what the nil value used to do.

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** `read-event' does not return decoded chars in ttys any more.
Just as was the case in Emacs-22 and before, decoding of tty input according to
keyboard-coding-system is not performed in read-event any more.  But contrary
to that past, it is still done before input-decode-map/function-key-map/...

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** Removed inhibit-local-menu-bar-menus.

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** frame-local variables that affect redisplay do not work any more.
More specifically, the redisplay does not bother to check for a frame-local
value when looking up variables.

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** nil and "unbound" are indistinguishable in symbol-function.
`symbol-function' never signals `void-function' any more.
`fboundp' returns non-nil if the symbol was `fset' to nil.

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** `defadvice' does not honor the `freeze' flag and cannot advise
special-forms any more.
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** `dolist' in lexical-binding mode does not bind VAR in RESULT any more.
VAR was bound to nil which was not tremendously useful and just lead to
spurious warnings about an unused var.

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** The return value of `backup-buffer' has changed.
The second argument is no longer an SELinux context, instead it is an
alist of extended attributes as returned by the new function
`file-extended-attributes'.  The attributes can be applied to another
file using `set-file-extended-attributes'.

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** `visited-file-modtime' now returns -1 for nonexistent files.
Formerly it returned a list (-1 LOW USEC PSEC), but this was ambiguous
in the presence of files with negative time stamps.
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** The cars of the elements in `interpreter-mode-alist' are now treated
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as regexps rather than literal strings.  Technically this is an
incompatible change, but unless you are using interpreter-mode-alist
for something (not just adding elements to it), it ought not to affect you.
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* Lisp Changes in Emacs 24.4
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** New variable `enable-dir-local-variables'.
Directory-local variables are ignored if this is set to nil.  This may
be useful for modes that want to ignore directory-locals while still
respecting file-local variables.

** New macro `define-alternatives' can be used to define generic commands.
Generic commands are interactive functions whose implementation can be
selected among several alternatives, as a matter of user preference.

** New function `get-pos-property'.

** Minibuffer changes

*** completing-read-multiple's separator can now be a regexp.
The default separator is changed to allow surrounding spaces around the comma.

*** New option `read-regexp-defaults-function' defines the function
that provides the default value for commands that ask for a regexp:
`rgrep', `lgrep' `occur', `multi-occur', `multi-occur-in-matching-buffers',
`highlight-regexp', `highlight-lines-matching-regexp', `highlight-phrase'.
This option can be customized to values that provide a default value
from the regexp last history element or from the symbol found at point.

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** New option `load-prefer-newer', if non-nil, means that when both
.el and .elc versions of a file exist, rather than `load' always
choosing the .elc version, it will choose whichever is newer
(unless you explicitly specify one or the other).

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** New hook `pre-redisplay-function'.

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** Functions that pop up menus and dialogs now work on all terminal types,
including TTYs.
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This includes `x-popup-menu', `x-popup-dialog', `message-box',
`yes-or-no-p', etc.

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The function `display-popup-menus-p' will now return non-nil for a
display or frame whenever a mouse is supported on that display or
frame.

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** New bool-vector set operation functions:
*** `bool-vector-exclusive-or'
*** `bool-vector-union'
*** `bool-vector-intersection'
*** `bool-vector-set-difference'
*** `bool-vector-not'
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*** `bool-vector-subsetp'
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*** `bool-vector-count-consecutive'
*** `bool-vector-count-population'
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** Comparison functions =, <, >, <=, >= now take many arguments.

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** The second argument of `eval' can now be a lexical-environment.

** `with-demoted-errors' takes an additional argument `format'.
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** New function `define-error'.

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** New hook `tty-setup-hook'.

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** New macro with-eval-after-load.  Like eval-after-load, but better behaved.

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** New library subr-x.el for misc helper functions
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*** `hash-table-keys'
*** `hash-table-values'
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*** `string-blank-p`
*** `string-empty-p`
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*** `string-join`
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*** `string-reverse`
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*** `string-trim-left'
*** `string-trim-right'
*** `string-trim'
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*** `string-remove-prefix'
*** `string-remove-suffix'
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** Obsoleted functions:
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*** `log10'
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*** `dont-compile'
*** `lisp-complete-symbol'
*** `field-complete'
*** `minibuffer-completion-contents'
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*** `isearch-nonincremental-exit-minibuffer'
*** `isearch-filter-visible'
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*** `generic-make-keywords-list'
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** `with-wrapper-hook' is obsoleted by `add-function'.
The few hooks that used with-wrapper-hook are replaced as follows:
*** `abbrev-expand-function' obsoletes `abbrev-expand-functions'.
*** `completion-in-region-function' obsoletes `completion-in-region-functions'.
*** `filter-buffer-substring-function' obsoletes `filter-buffer-substring-functions'.

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** `byte-compile-interactive-only-functions' is now obsolete.
It has been replaced by the symbol property 'interactive-only.

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** `split-string' now takes an optional argument TRIM.
The value, if non-nil, is a regexp that specifies what to trim from
the start and end of each substring.
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** New function `string-suffix-p'.

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** `get-upcase-table' is obsoleted by the new `case-table-get-table'.

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** File-handling changes

*** Support for filesystem notifications.
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Emacs now supports notifications of filesystem changes, such as
creation, modification, and deletion of files.  This requires the
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`glib' API, or the 'inotify' API (on GNU/Linux systems only).  On
MS-Windows systems, this is supported for Windows XP and newer
versions.
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*** The 9th element returned by `file-attributes' is now unspecified.
Formerly, it was t if the file's gid would change if file were deleted
and recreated.  This value has been inaccurate for years on many
platforms, and nobody seems to have noticed or cared.

*** The 6th argument to `copy-file' has been renamed to
PRESERVE-EXTENDED-ATTRIBUTES as it now handles both SELinux context
and ACL entries.

*** The function `file-ownership-preserved-p' now has an optional
argument GROUP which causes it check for file group too.  This can be
used in place of the 9th element of `file-attributes'.


*** The function `set-visited-file-modtime' now accepts a 0 or -1
argument, with the same interpretation as the returned value of
`visited-file-modtime'.

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** Changes in autorevert.el

---
*** If Emacs is compiled with file notification support, notifications
are used instead of checking the time stamp of the files.  You can
disable this by setting the user option `auto-revert-use-notify' to
nil.  Alternatively, a regular expression of directories to be
excluded from file notifications can be specified by
`auto-revert-notify-exclude-dir-regexp'.

---
*** The new user option `auto-revert-remote-files' enables reversion
of remote files when set to non-nil.

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** Face changes

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*** The function `face-spec-set' is now analogous to `setq' for face specs.
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Its third arg now accepts values specifying exactly which face spec to
set (defface, custom, or user spec), and it directly sets the relevant
property using the supplied face spec.

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*** New function `add-face-text-property', which can be used to
conveniently prepend/append new face properties.

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*** Face specs set via Custom themes now replace the `defface' spec
rather than inheriting from it (as do face specs set via Customize).

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*** New face characteristic (supports :underline (:style wave))
specifies whether or not the terminal can display a wavy line.

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*** New face spec attribute :distant-foreground
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specifies foreground to use if background color is near the foreground
color that would otherwise have been used.
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** Image API

+++
*** `image-animated-p' is now `image-multi-frame-p'.
It returns non-nil for any image that contains multiple frames,
whether or not it specifies a frame delay.

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*** When animating images that do not specify a frame delay,
Emacs uses `image-default-frame-delay'.

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*** New functions `image-current-frame' and `image-show-frame' for getting
and setting the current frame of a multi-frame image.

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*** You can change the speed of animated images.

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** EIEIO

*** Namespace cleanup by obsolete-aliasing functions to use `eieio-' prefix.
**** object-name -> eieio-object-name
**** object-class -> eieio-object-class
**** object-class-fast -> eieio--object-class
**** object-name-string -> eieio-object-name-string
**** object-num-slots -> eieio--object-num-slots
**** object-set-name-string -> eieio-object-set-name-string
**** class-parent -> eieio-class-parent
**** class-parents -> eieio-class-parents
**** class-children -> eieio-class-children
**** class-num-slots -> eieio--class-num-slots
**** class-precedence-list -> eieio-class-precedence-list
**** All generated class-* and object-* field accessors are now
prefixed with `eieio-' as well.

*** Obsoleted functions:
**** class-of
**** class-direct-subclasses
**** class-direct-superclasses

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** Changes in encoding and decoding of text

---
*** New coding-system `prefer-utf-8'.
This is like `undecided' but prefers UTF-8 on decoding if the text to
be decoded does not contain any invalid UTF-8 sequences.  On encoding,
any non-ASCII characters are automatically encoded as UTF-8.

---
*** New attributes of coding-systems whose type is `undecided'.
Two new attributes, `:inhibit-null-byte-detection' and
`:inhibit-iso-escape-detection', determine how to detect encoding of
text that includes null bytes and ISO-2022 escape sequences,
respectively.  Each of these attributes can be either nil, zero, or
t.  If it is t, decoding text ignores null bytes and, respectively,
ISO-2022 sequences.  If it is nil, null bytes cause text to be decoded
with no-conversion and ISO-2022 sequences cause Emacs to assume the
text is encoded in one of the ISO-2022 encodings, such as
iso-2022-7bit.  If the value is zero, Emacs consults the variables
inhibit-null-byte-detection and inhibit-iso-escape-detection, which
see.
The new attribute `:prefer-utf-8', if non-nil, causes Emacs to prefer
UTF-8 encoding and decoding, whenever possible.

These attributes are only meaningful for coding-systems of type
`undecided'.  (The type of a coding-system is determined by its
`:coding-type' attribute and can be accessed by calling the
`coding-system-type' function.)

Chong Yidong's avatar
Chong Yidong committed
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** `time-to-seconds' is not obsolete any more.

** New functions `special-form-p' and `macrop'.
Paul Eggert's avatar
Paul Eggert committed
1116

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** Docstrings can be made dynamic by adding a `dynamic-docstring-function'
text-property on the first char.

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** The `defalias-fset-function' property lets you catch calls to defalias
and redirect them to your own function instead of `fset'.

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** The lock for 'DIR/FILE' is now 'DIR/.#FILE' and may be a regular file.
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When you edit DIR/FILE, Emacs normally creates a symbolic link
DIR/.#FILE as a lock that warns other instances of Emacs that DIR/FILE
is being edited.  Formerly, if there was already a non-symlink file
named DIR/.#FILE, Emacs fell back on the lock names DIR/.#FILE.0
through DIR/.#FILE.9.  These fallbacks have been removed, so that
Emacs now no longer locks DIR/FILE in that case.