1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2010-2013 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 If possible, use M-x report-emacs-bug.
9 This file is about changes in Emacs version 24.
11 See files NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
12 and NEWS.1-17 for changes in older Emacs versions.
14 You can narrow news to a specific version by calling `view-emacs-news'
15 with a prefix argument or by typing C-u C-h C-n.
18 +++ indicates that the appropriate manual has already been updated.
19 --- means no change in the manuals is called for.
20 When you add a new item, please add it without either +++ or ---
21 so we will look at it and add it to the manual.
24 * Installation Changes in Emacs 24.4
26 ** Emacs can be compiled with POSIX ACL support.
27 This happens by default if a suitable support library is found at
28 build time, like libacl on GNU/Linux. To prevent this, use the
29 configure option `--without-acl'.
31 ** The configure option --with-crt-dir has been removed.
32 It is no longer needed, as the crt*.o files are no longer linked specially.
35 * Startup Changes in Emacs 24.4
38 * Changes in Emacs 24.4
40 ** Key ? also describes prefix bindings like C-h.
43 ** `apropos-variable' is now `apropos-user-option'
44 `apropos-user-option' shows all user options while `apropos-variable'
45 shows all variables. When called with a universal prefix argument,
46 the two commands swap their behaviors. When `apropos-do-all' is
47 non-nil, they output the same results.
50 ** `eval-defun' on an already defined defcustom calls the :set function,
53 ** If the new variable `enable-dir-local-variables' is nil,
54 directory local variables are ignored. May be useful for some modes
55 that want to ignore directory-locals while still respecting file-locals.
57 ** The option `set-mark-default-inactive' has been deleted.
58 This unfinished feature was introduced by accident in Emacs 23.1;
59 simply disabling Transient Mark mode does the same thing.
61 ** `initial-buffer-choice' can now specify a function to set up the
64 ** ACL support has been added.
66 *** Emacs preserves the ACL entries of files when backing up.
68 *** New functions `file-acl' and `set-file-acl' get and set the ACL
69 entries of a file. On GNU/Linux, the POSIX ACL interface is used via
70 libacl. On MS-Windows, the NT Security APIs are used to emulate the
73 ** New option `scroll-bar-adjust-thumb-portion'.
74 Available only on X, this option allows to control over-scrolling
75 using the scroll bar (i.e. dragging the thumb down even when the end
76 of the buffer is visible).
78 ** In compiled Lisp files, the header no longer includes a timestamp.
81 * Editing Changes in Emacs 24.4
83 ** `split-window' is no longer a command, just a non-interactive function.
84 As a command it was a special case of `split-window-below', and as such
85 superfluous. After being reimplemented in Lisp, its interactive form
86 was mistakenly retained.
88 ** New commands `toggle-frame-fullscreen' and `toggle-frame-maximized',
89 bound to <f11> and M-<f10>, respectively.
91 ** In keymaps where SPC scrolls, S-SPC now scrolls in the reverse direction.
94 ** New command `kmacro-to-register' to store keyboard macros in registers.
98 *** `sh-mode' now has the mode own `add-log-current-defun-function'.
99 You can pick the name of the function and the variables with `C-x 4 a'.
102 * Changes in Specialized Modes and Packages in Emacs 24.4
104 ** `remember' can now store notes in separates files
105 You can use the new function `remember-store-in-files' within the
106 `remember-handler-functions' option.
108 See `remember-data-directory' and `remember-directory-file-name-format'
109 for new options related to this function.
110 ** `ido-decorations' has been slightly extended to give a bit more control.
112 ** More packages look for ~/.emacs.d/<foo> additionally to ~/.<foo>.
114 ~/.emacs.d/timelog replaces ~/.timelog
115 ~/.emacs.d/todo-do replaces ~/.todo-do
116 ~/.emacs.d/todo-done replaces ~/.todo-done
117 ~/.emacs.d/todo-top replaces ~/.todo-top
118 ~/.emacs.d/vip replaces ~/.vip
119 ~/.emacs.d/viper replaces ~/.viper
120 ~/.emacs.d/ido.last replaces ~/.ido.last
121 ~/.emacs.d/kkcrc replaces ~/.kkcrc
122 ~/.emacs.d/quickurls replaces ~/.quickurls
123 ~/.emacs.d/idlwave replaces ~/.idlwave
124 ~/.emacs.d/bdfcache.el replaces ~/.bdfcache.el
125 ~/.emacs.d/places replaces ~/.emacs-places
126 ~/.emacs.d/shadows replaces ~/.shadows
127 ~/.emacs.d/shadow_todo replaces ~/.shadow_todo
128 ~/.emacs.d/strokes replaces ~/.strokes
129 ~/.emacs.d/notes replaces ~/.notes
130 ~/.emacs.d/type-break replaces ~/.type-break
132 ** Delphi mode is now called OPascal mode.
133 *** All delphi-* variables and functions have been renamed to opascal-*.
134 *** `delphi-newline-always-indents' is not supported any more
135 use `electric-indent-mode' instead.
136 *** `delphi-tab' is gone, replaced by `indent-for-tab-command'.
138 ** Eldoc Mode works properly in the minibuffer.
140 ** jit-lock-debug-mode lets you use the debuggers on code run via jit-lock.
142 ** completing-read-multiple's separator can now be a regexp.
143 The default separator is changed to allow surrounding spaces around the comma.
147 *** Battery information via the BSD `apm' utility is now supported.
149 ** Calendar and Diary
152 *** New variable `diary-from-outlook-function' for used by the command
153 `diary-from-outlook'.
157 *** New macro cl-tagbody.
160 *** letf is now just an alias for cl-letf.
164 *** Calc by default now uses the Gregorian calendar for all dates, and
165 uses January 1, 1 AD as its day number 1. Previously Calc used the
166 Julian calendar for dates before September 14, 1752, and it used
167 December 31, 1 BC as its day number 1; the new scheme is more
168 consistent with Calendar's calendrical system and day numbering.
170 *** The new variable `calc-gregorian-switch' lets you configure the
171 date when Calc switches from the Julian to the Gregorian calendar.
172 Nil, the default value, means to always use the Gregorian calendar.
173 The value (YEAR MONTH DAY) means to start using the Gregorian calendar
176 *** Support for ISO 8601 dates.
180 *** `desktop-auto-save-timeout' defines the number of seconds between
181 auto-saves of the desktop.
185 *** New minor mode `dired-hide-details-mode' hides details.
189 *** New option `erc-accidental-paste-threshold-seconds'.
190 If set to a number, this can be used to avoid accidentally paste large
191 amounts of data into the ERC input.
193 ** Icomplete is a bit more like IDO.
194 *** key bindings to navigate through and select the completions.
195 *** The icomplete-separator is customizable, and its default has changed.
196 *** Removed icomplete-show-key-bindings.
200 *** New commands `n' (`image-next-file') and `p' (`image-previous-file')
201 visit the next image file and the previous image file in the same
202 directory, respectively.
204 *** New commands to show specific frames of multi-frame images.
205 `f' (`image-next-frame') and `b' (`image-previous-frame') visit the
206 next or previous frame. `F' (`image-goto-frame') shows a specific frame.
209 *** The command `image-mode-fit-frame' deletes other windows.
210 When toggling, it restores the frame's previous window configuration.
211 It also has an optional frame argument, which can be used by Lisp
212 callers to fit the image to a frame other than the selected frame.
216 *** New face `info-index-match' is used to highlight matches in index
217 entries displayed by `Info-index-next', `Info-virtual-index' and
222 *** `C-x 8 RET' in Isearch mode reads a character by its Unicode name
223 and adds it to the search string.
225 ** MH-E has been updated to MH-E version 8.5.
226 See MH-E-NEWS for details.
229 ** The unrmail command converts from BABYL to mboxrd rather than mboxo.
230 Customize `unrmail-mbox-format' to change this.
233 ** Similarly, customize `rmail-mbox-format' to influence some minor aspects
234 of how Rmail displays non-MIME messages.
237 ** New function `ses-rename-cell' to give SES cells arbitrary names.
239 ** trace-function was largely rewritten.
240 New features include:
241 - no prompting for the destination buffer, unless a prefix-arg was used.
242 - additionally to prompting for a destination buffer, when a prefix-arg is
243 used, the user can enter a "context", i.e. Lisp expression whose value at the
244 time the function is entered/exited will be printed along with the function
245 name and arguments. Useful to trace the value of (current-buffer) or
246 (point) when the function is invoked.
248 ** New command `delete-duplicate-lines' has two types of operation:
249 when its arg ADJACENT is non-nil (when called interactively with C-u C-u)
250 it works like the utility `uniq'. Otherwise by default it deletes
251 duplicate lines everywhere in the region without regard to adjacency.
253 ** New `cycle-spacing' command allows cycling between having just one
254 space, no spaces, or reverting to the original spacing. Like
255 `just-one-space' command it can handle or ignore newlines and
256 leave different number of spaces.
261 *** New connection method "adb", which allows to access Android
262 devices by the Android Debug Bridge. The variable `tramp-adb-program'
263 can be used to adapt the path of the "adb" program, if needed.
265 *** The connection methods "plink1", "ssh1", "ssh2", "scp1", "scp2",
266 "scpc" and "rsyncc" are discontinued. The ssh option
267 "ControlMaster=auto" is set automatically in all ssh-based methods,
271 *** Handlers for `file-acl' and `set-file-acl' for remote machines
272 which support POSIX ACLs.
276 *** The commands `woman-default-faces' and `woman-monochrome-faces'
277 are obsolete. Customize the `woman-* faces instead.
281 *** Added Eshell-TRAMP module
282 External su and sudo commands are now the default; the internal,
283 TRAMP-using variants can still be used by enabling the eshell-tramp
286 ** Obsolete packages:
288 *** longlines.el is obsolete; use visual-line-mode instead.
290 *** terminal.el is obsolete; use term.el instead.
293 *** yow.el is obsolete; use fortune.el or cookie1.el instead.
296 *** The Info-edit command is obsolete. Editing Info nodes by hand
297 has not been relevant for some time.
300 * New Modes and Packages in Emacs 24.4
301 ** New `superword-mode' in subword.el
302 `superword-mode' overrides the default word motion commands to treat
303 symbol_words as a single word, similar to what `subword-mode' does and
304 using the same internal functions.
306 ** New nadvice.el package offering lighter-weight advice facilities.
308 - add-function/remove-function which can be used to add/remove code on any
309 function-carrying place, such as process-filters or `<foo>-function' hooks.
310 - advice-add/advice-remove to add/remove a piece of advice on a named function,
311 much like `defadvice' does.
314 * Incompatible Lisp Changes in Emacs 24.4
316 ** `read-event' does not return decoded chars in ttys any more.
317 Just as was the case in Emacs-22 and before, decoding of tty input according to
318 keyboard-coding-system is not performed in read-event any more. But contrary
319 to that past, it is still done before input-decode-map/function-key-map/...
321 ** Removed inhibit-local-menu-bar-menus.
323 ** frame-local variables that affect redisplay do not work any more.
324 More specifically, the redisplay does not bother to check for a frame-local
325 value when looking up variables.
327 ** nil and "unbound" are indistinguishable in symbol-function.
328 `symbol-function' never signals `void-function' any more.
329 `fboundp' returns non-nil if the symbol was `fset' to nil.
331 ** `defadvice' does not honor the `freeze' flag and cannot advise
332 special-forms any more.
334 ** `dolist' in lexical-binding mode does not bind VAR in RESULT any more.
335 VAR was bound to nil which was not tremendously useful and just lead to
336 spurious warnings about an unused var.
338 ** The return value of `backup-buffer' has changed.
339 The second argument is no longer an SELinux context, instead it is an
340 alist of extended attributes as returned by the new function
341 `file-extended-attributes'. The attributes can be applied to another
342 file using `set-file-extended-attributes'.
345 * Lisp Changes in Emacs 24.4
347 ** Obsoleted functions:
349 *** `lisp-complete-symbol'
351 *** `minibuffer-completion-contents'
353 ** `with-wrapper-hook' is obsoleted by `add-function'.
354 The few hooks that used with-wrapper-hook are replaced as follows:
355 *** `abbrev-expand-function' obsoletes `abbrev-expand-functions'.
356 *** `completion-in-region-function' obsoletes `completion-in-region-functions'.
357 *** `filter-buffer-substring-function' obsoletes `filter-buffer-substring-functions'.
360 ** `get-upcase-table' is obsoleted by the new `case-table-get-table'.
362 ** Support for filesystem notifications.
363 Emacs now supports notifications of filesystem changes, such as
364 creation, modification, and deletion of files. This requires the
365 'inotify' API on GNU/Linux systems. On MS-Windows systems, this is
366 supported for Windows XP and newer versions.
368 ** Changes in autorevert.el
371 *** If Emacs is compiled with file notification support, notifications
372 are used instead of checking the time stamp of the files. You can
373 disable this by setting the user option `auto-revert-use-notify' to
374 nil. Alternatively, a regular expression of directories to be
375 excluded from file notifications can be specified by
376 `auto-revert-notify-exclude-dir-regexp'.
379 *** The new user option `auto-revert-remote-files' enables reversion
380 of remote files when set to non-nil.
384 *** The `face-spec-set' is now analogous to `setq' for face specs.
385 Its third arg now accepts values specifying exactly which face spec to
386 set (defface, custom, or user spec), and it directly sets the relevant
387 property using the supplied face spec.
389 *** Face specs set via Custom themes now replace the `defface' spec
390 rather than inheriting from it (as do face specs set via Customize).
392 *** New face characteristic (supports :underline (:style wave))
393 specifies whether or not the terminal can display a wavy line.
398 *** `image-animated-p' is now `image-multi-frame-p'.
399 It returns non-nil for any image that contains multiple frames,
400 whether or not it specifies a frame delay.
403 *** When animating images that do not specify a frame delay,
404 Emacs uses `image-default-frame-delay'.
407 *** New functions `image-current-frame' and `image-show-frame' for getting
408 and setting the current frame of a multi-frame image.
410 ** time-to-seconds is not obsolete any more.
411 ** New function special-form-p.
412 ** Docstrings can be made dynamic by adding a `dynamic-docstring-function'
413 text-property on the first char.
415 ** The `defalias-fset-function' property lets you catch calls to defalias
416 and redirect them to your own function instead of `fset'.
418 ** The lock for 'DIR/FILE' is now 'DIR/.#FILE' and may be a regular file.
419 When you edit DIR/FILE, Emacs normally creates a symbolic link
420 DIR/.#FILE as a lock that warns other instances of Emacs that DIR/FILE
421 is being edited. Formerly, if there was already a non-symlink file
422 named DIR/.#FILE, Emacs fell back on the lock names DIR/.#FILE.0
423 through DIR/.#FILE.9. These fallbacks have been removed, so that
424 Emacs now no longer locks DIR/FILE in that case.
426 On file systems that do not support symbolic links, the lock is now a
427 regular file with contents being what would have been in the symlink.
429 ** The 9th element returned by `file-attributes' is now unspecified.
430 Formerly, it was t if the file's gid would change if file were deleted
431 and recreated. This value has been inaccurate for years on many
432 platforms, and nobody seems to have noticed or cared.
434 ** The function `file-ownership-preserved-p' now has an optional
435 argument GROUP which causes it check for file group too. This can be
436 used in place of the 9th element of `file-attributes'.
438 ** New functions `group-gid' and `group-real-gid'.
440 ** The 6th argument to `copy-file' has been renamed to
441 `preserve-extended-attributes' as it now handles both SELinux context
444 ** Changes to the Emacs Lisp Coding Conventions in Emacs 24.4
446 *** The package descriptor and name of global variables, constants,
447 and functions should be separated by two hyphens if the symbol is not
448 meant to be used by other packages.
451 * Changes in Emacs 24.4 on Non-Free Operating Systems
454 ** The "generate a backtrace on fatal error" feature now works on MS Windows.
455 The backtrace is written to the 'emacs_backtrace.txt' file in the
456 directory where Emacs was running.
459 ** The variable `buffer-file-type' is no longer supported.
460 Setting it has no effect, and %t in the mode-line format is ignored.
461 Likewise, `file-name-buffer-file-type-alist' is now obsolete, and
462 modifying it has no effect.
465 ** Lock files now work on MS-Windows.
466 This allows to avoid losing your edits if the same file is being
467 edited in another Emacs session or by another user. See the node
468 "Interlocking" in the Emacs User Manual for the details. To disable
469 file locking, customize `create-lockfiles' to nil.
471 ** Improved fullscreen support on Mac OS X.
472 Both native (>= OSX 10.7) and "old style" fullscreen are supported.
473 Customize `ns-use-native-fullscreen' to change style. For >= 10.7
474 native is the default.
477 * Installation Changes in Emacs 24.3
479 ** The default X toolkit is now Gtk+ version 3.
480 If you don't pass `--with-x-toolkit' to configure, or if you use
481 `--with-x-toolkit=gtk' or `--with-x-toolkit=yes', configure will try
482 to build with Gtk+ version 3, and if that fails, try Gtk+ version 2.
483 You can explicitly require a specific version by passing
484 `--with-x-toolkit=gtk2' or `--with-x-toolkit=gtk3' to configure.
486 ** New configure option `--enable-link-time-optimization', to utilize
487 an appropriate feature provided by GCC since version 4.5.0.
489 ** New configure option `--without-all' to disable most of the optional
490 features (image support, etc.) that are normally enabled by default.
492 ** New configure option `--enable-gcc-warnings' (for developing/debugging
493 Emacs). If building with GCC, this enables compile-time checks that
494 warn/give errors about possibly-questionable C code. On a recent GNU
495 system there should be no warnings; on older and on non-GNU systems
496 the results may be useful to developers.
498 ** The configure option `--enable-use-lisp-union-type' has been
499 renamed to `--enable-check-lisp-object-type', as the resulting
500 Lisp_Object type no longer uses a union to implement the compile time
501 check that this option enables.
503 ** The configure option `--disable-maintainer-mode' has been removed,
504 as it was confusingly-named and rarely useful.
506 ** The configure options `--program-prefix', `--program-suffix', and
507 `--program-transform-name' apply to more than just the installed
508 binaries. Now they also affect the man pages, icons, and the
509 etc/emacs.desktop file; but not the info pages, since this would break
510 links between the various manuals.
512 ** You can use `NO_BIN_LINK=t make install' to prevent the installation
513 overwriting "emacs" in the installation bin/ directory with a link
516 ** Emacs uses libtinfo in preference to libncurses, if available.
518 ** On FreeBSD and NetBSD, configure no longer adds /usr/local/lib and
519 /usr/pkg/lib to the linker search path. You must add them yourself if
522 ** The standalone scripts `rcs-checkin' and `vcdiff' have been removed
523 (from the bin and libexec directories, respectively). The former is
524 no longer relevant, the latter is replaced by lisp (in vc-sccs.el).
527 * Startup Changes in Emacs 24.3
529 ** Emacs no longer searches for `leim-list.el' files beneath the standard
530 lisp/ directory. There should not be any there anyway. If you have
531 been adding them there, put them somewhere else; e.g., site-lisp.
533 ** The `--no-site-lisp' command line option now works for Nextstep builds.
536 * Changes in Emacs 24.3
540 *** `C-h f' (`describe-function') can now perform autoloading.
541 When this command is called for an autoloaded function whose docstring
542 contains a key substitution construct, that function's library is
543 automatically loaded, so that the documentation can be shown
544 correctly. To disable this, set `help-enable-auto-load' to nil.
546 *** `C-h f' now reports previously-autoloaded functions as "autoloaded",
547 even after their associated libraries have been loaded (and the
548 autoloads have been redefined as functions).
552 *** Images displayed via ImageMagick now support transparency and the
553 :background image specification property.
555 *** When available, ImageMagick support is automatically enabled.
556 It is no longer necessary to call `imagemagick-register-types'
557 explicitly to install ImageMagick image types; that function is called
558 automatically at startup, or when customizing an imagemagick- option.
560 *** Setting `imagemagick-types-inhibit' to t now disables the use of
561 ImageMagick to view images. (You must call `imagemagick-register-types'
562 afterwards if you do not use customize to change this.)
564 *** The new variable `imagemagick-enabled-types' also affects which
565 ImageMagick types are treated as images. The function
566 `imagemagick-filter-types' returns the list of types that will be
571 *** In minibuffer filename prompts, `C-M-f' and `C-M-b' now move to the
572 next and previous path separator, respectively.
574 *** `minibuffer-electric-default-mode' can shorten "(default ...)" to "[...]"
575 in minibuffer prompts. Just set `minibuffer-eldef-shorten-default'
576 non-nil before enabling the mode.
580 *** New option `mode-line-default-help-echo' specifies the help text
581 (shown in a tooltip or in the echo area) for any part of the mode line
582 that does not have its own specialized help text.
584 *** You can now click mouse-3 in the coding system indicator to invoke
585 `set-buffer-file-coding-system'.
589 *** emacsclient now obeys string values for `initial-buffer-choice',
590 if it is told to open a new frame without specifying any file to visit
591 or expression to evaluate.
593 *** New option `server-auth-key' specifies a shared server key.
595 ** Emacs now generates backtraces on fatal errors.
596 On encountering a fatal error, Emacs now outputs a textual description
597 of the fatal signal, and a short backtrace on platforms like glibc
598 that support backtraces.
600 ** `C-x C-q' is now bound to the new minor mode `read-only-mode'.
601 This minor mode replaces `toggle-read-only', which is now obsolete.
603 ** Most `y-or-n' prompts now allow you to scroll the selected window.
604 Typing `C-v' or `M-v' at a y-or-n prompt scrolls forward or backward
605 respectively, without exiting from the prompt.
607 ** In the Package Menu, newly-available packages are listed as "new",
608 and sorted above the other "available" packages by default.
610 ** If your Emacs was built from a bzr checkout, the new variable
611 `emacs-bzr-version' contains information about the bzr revision used.
613 ** New option `create-lockfiles' specifies usage of lockfiles.
614 It defaults to t. Changing it to nil inhibits the creation of lock
615 files (use this with caution).
617 ** New option `enable-remote-dir-locals', if non-nil, allows directory-local
618 variables on remote hosts.
620 ** The entry for PCL-CVS has been removed from the Tools menu.
621 The PCL-CVS commands are still available via the keyboard.
623 ** Using "unibyte: t" in Lisp source files is obsolete.
624 Use "coding: raw-text" instead.
626 ** In the buffer made by `M-x report-emacs-bug', the `C-c m' binding
627 has been changed to `C-c M-i' (`report-emacs-bug-insert-to-mailer').
628 The previous binding, introduced in Emacs 24.1, was a mistake, because
629 `C-c LETTER' bindings are reserved for user customizations.
631 ** Internationalization
633 *** New language environment: Persian.
635 *** New input method `vietnamese-vni'.
637 ** Nextstep (GNUstep / Mac OS X) port
639 *** Support for fullscreen and the frame parameter fullscreen.
641 *** A file dialog is used for open/save operations initiated from the
645 * Editing Changes in Emacs 24.3
647 ** Search and Replace
649 *** Non-regexp Isearch now performs "lax" space matching.
650 Each sequence of spaces in the supplied search string may match any
651 sequence of one or more whitespace characters, as specified by the
652 variable `search-whitespace-regexp'. (This variable is also used by a
653 similar existing feature for regexp Isearch.)
655 *** New Isearch command `M-s SPC' toggles lax space matching.
656 This applies to both ordinary and regexp Isearch.
658 *** New option `replace-lax-whitespace'.
659 If non-nil, `query-replace' uses flexible whitespace matching too.
662 *** Global `M-s _' starts a symbol (identifier) incremental search,
663 and `M-s _' in Isearch toggles symbol search mode.
664 `M-s c' in Isearch toggles search case-sensitivity.
666 ** Navigation commands
668 *** New binding `M-g c' for `goto-char'.
670 *** New binding `M-g TAB' for `move-to-column'.
672 *** `M-g TAB' (`move-to-column') prompts for a column number if called
673 interactively with no prefix arg. Previously, it moved to column 1.
675 ** New option `yank-handled-properties' allows processing of text
676 properties on yanked text, in ways that are more general than just
677 removing them (as is done by `yank-excluded-properties').
679 ** New option `delete-trailing-lines' specifies whether
680 M-x delete-trailing-whitespace should delete trailing lines at the end
681 of the buffer. It defaults to t.
683 ** `C-u M-=' now counts lines/words/characters in the entire buffer.
685 ** `C-x 8 RET' is now bound to `insert-char', which is now a command.
686 `ucs-insert' is now an obsolete alias for `insert-char'.
688 ** The `z' key no longer has a binding in most special modes.
689 It used to be bound to `kill-this-buffer', but `z' is too easy to
692 ** New command `C-x r M-w' (`copy-rectangle-as-kill').
693 It copies the region-rectangle as the last rectangle kill.
697 *** `C-x r +' is now overloaded to invoke `append-to-register'.
699 *** New option `register-separator' specifies the register containing
700 the text to put between collected texts for use with
701 M-x append-to-register and M-x prepend-to-register.
704 * Changes in Specialized Modes and Packages in Emacs 24.3
706 ** Common Lisp emulation (CL)
708 *** CL's main entry is now (require 'cl-lib).
709 `cl-lib' is like the old `cl' except that it uses the namespace cleanly;
710 i.e., all its definitions have the "cl-" prefix (and internal definitions
711 use the "cl--" prefix).
713 If `cl' provided a feature under the name `foo', then `cl-lib'
714 provides it under the name `cl-foo' instead; with the exceptions of the
715 few `cl' definitions that had to use `foo*' to avoid conflicts with
716 pre-existing Elisp entities. These have been renamed to `cl-foo'
717 rather than `cl-foo*'.
719 The old `cl' is now deprecated and is mainly just a bunch of aliases that
720 provide the old, non-prefixed names. Some exceptions are listed below:
722 *** `cl-flet' is not like `flet' (which is deprecated).
723 Instead it obeys the behavior of Common-Lisp's `flet'.
724 In particular, in cl-flet function definitions are lexically scoped,
725 whereas in flet the scoping is dynamic.
727 *** `cl-labels' is slightly different from `labels'.
728 The difference is that it relies on the `lexical-binding' machinery
729 (as opposed to the `lexical-let' machinery used previously) to capture
730 definitions in closures, so such closures will only work if `lexical-binding'
733 *** `cl-letf' is not exactly like `letf'.
734 The only difference is in details that relate to some deprecated usage
735 of `symbol-function' in place forms.
737 *** `progv' was rewritten to use the `let' machinery.
738 A side effect is that variables without corresponding values are bound
739 to nil rather than being made unbound.
741 *** The following methods of extending `setf' are obsolete
742 (use features from gv.el instead):
743 `define-modify-macro' (use `gv-letplace')
744 `defsetf' (use `gv-define-simple-setter' or `gv-define-setter')
745 `define-setf-expander' (use `gv-define-setter' or `gv-define-expander')
746 `get-setf-method' no longer exists (see "Incompatible Lisp Changes")
750 *** Changes are now highlighted using the same color scheme as in
751 modern VCSes. Deletions are displayed in red (new faces
752 `diff-refine-removed' and `smerge-refined-removed', and new definition
753 of `diff-removed'), insertions in green (new faces `diff-refine-added'
754 and `smerge-refined-added', and new definition of `diff-added').
756 *** The variable `diff-use-changed-face' defines whether to use the
757 face `diff-changed', or `diff-removed' and `diff-added' to highlight
758 changes in context diffs.
760 *** The new command `diff-delete-trailing-whitespace' removes trailing
761 whitespace introduced by a diff.
763 ** Ediff now uses the same color scheme as Diff mode.
767 A new version of python.el, which provides several new features, including:
768 per-buffer shells, better indentation, Python 3 support, and improved
769 shell-interaction compatible with iPython (and virtually any other
772 *** Some user options have been replaced/renamed, including (old -> new):
773 **** python-indent -> python-indent-offset
774 **** python-guess-indent -> python-indent-guess-indent-offset
775 **** python-pdbtrack-do-tracking-p -> python-pdbtrack-activate
776 **** python-use-skeletons -> python-skeleton-autoinsert
778 *** Some user options have been removed, including:
780 **** `python-indent-string-contents': Strings are never indented.
782 **** `python-honour-comment-indentation':
783 Comments are always considered as indentation markers.
785 **** `python-continuation-offset': Indentation is automatically
786 calculated in a pep8 compliant way depending on the context.
788 **** `python-shell-prompt-alist', `python-shell-continuation-prompt-alist':
789 Have no direct mapping as the shell interaction is completely different.
791 **** `python-python-command', `python-jython-command':
792 Replaced by `python-shell-interpreter'.
794 **** `inferior-python-filter-regexp', `python-remove-cwd-from-path',
795 `python-pdbtrack-minor-mode-string', `python-source-modes':
798 *** Some commands have been replaced (old -> new):
799 **** python-insert-class -> python-skeleton-class
800 **** python-insert-def -> python-skeleton-def
801 **** python-insert-for -> python-skeleton-for
802 **** python-insert-if -> python-skeleton-if
803 **** python-insert-try/except -> python-skeleton-try
804 **** python-insert-try/finally -> python-skeleton-try
805 **** python-insert-while -> python-skeleton-while
806 **** python-find-function -> python-nav-jump-to-defun
807 **** python-next-statement -> python-nav-forward-sentence
808 **** python-previous-statement -> python-nav-backward-sentence
809 **** python-beginning-of-defun-function -> python-nav-beginning-of-defun
810 **** python-end-of-defun-function -> python-nav-end-of-defun
811 **** python-send-buffer -> python-shell-send-buffer
812 **** python-send-defun -> python-shell-send-defun
813 **** python-send-region -> python-shell-send-region
814 **** python-send-region-and-go -> emulate with python-shell-send-region
815 and python-shell-switch-to-shell
816 **** python-send-string -> python-shell-send-string
817 **** python-switch-to-python -> python-shell-switch-to-shell
818 **** python-describe-symbol -> python-eldoc-at-point
822 *** New variables `dbus-compiled-version' and `dbus-runtime-version'.
824 *** The D-Bus object manager interface is implemented.
826 *** Variables of type :(u)int32 and :(u)int64 accept floating points,
827 if their value does not fit into Emacs's integer range.
829 *** The function `dbus-call-method' is now non-blocking.
830 It can be interrupted by `C-g'. `dbus-call-method-non-blocking' is obsolete.
832 *** Signals can also be sent as unicast messages.
834 *** The argument list of `dbus-register-signal' has been extended,
835 according to the new match rule types of D-Bus.
837 *** `dbus-init-bus' supports private connections.
839 *** There is a new function `dbus-setenv'.
841 ** `desktop-path' no longer includes the "." directory.
842 Desktop files are now located in ~/.emacs.d by default.
846 *** `dired-do-async-shell-command' executes each file sequentially
847 if the command ends in `;' (when operating on multiple files).
848 Otherwise, it executes the command on each file in parallel.
850 *** Typing `M-n' in the minibuffer of `dired-do-chmod', `dired-do-chgrp',
851 `dired-do-chown', and `dired-do-touch' yanks the attributes of the
854 *** When the region is active, `m' (`dired-mark'), `u' (`dired-unmark'),
855 `DEL' (`dired-unmark-backward'), and `d' (`dired-flag-file-deletion')
856 mark/unmark/flag all files in the active region.
858 *** The minibuffer default for `=' (`dired-diff) has changed.
859 It is now the backup file for the file at point, if one exists.
860 In Transient Mark mode the default is the file at the active mark.
862 *** `M-=' is no longer bound to `dired-backup-diff' in Dired buffers.
863 The global binding for `M-=', `count-words-region' is in effect.
867 *** New module "notifications", which can send a notification when you
868 receive a private message or your nickname is mentioned.
870 *** ERC will look up server/channel names via auth-source and use any
873 *** New option `erc-lurker-hide-list', similar to `erc-hide-list', but
874 only applies to messages sent by lurkers.
876 ** reStructuredText mode
878 *** Keybindings (see `C-c C-h'), TAB indentation, filling and auto-filling,
879 fontification, comment handling, and customization have all been revised
882 *** Support for `imenu' and `which-function-mode'.
884 *** The reStructuredText syntax is more closely covered.
885 Sphinx support has been improved.
887 *** `rst-insert-list' inserts new list or continues existing lists.
889 *** A negative prefix argument always works for `rst-adjust'.
891 *** The window configuration is reset after displaying a TOC.
893 *** The constant `rst-version' describes the rst.el package version.
897 *** Support for percent literals and recognition of regular expressions
898 in method calls without parentheses with more methods, including Cucumber
901 *** Improved syntax highlighting and indentation.
903 *** New command `ruby-toggle-block', bound to `C-c {'.
905 *** Some non-standard keybindings/commands have been removed:
907 **** `ruby-electric-brace'; use `electric-indent-mode' instead.
909 **** `ruby-mark-defun'; use `mark-defun'.
911 **** `ruby-beginning-of-defun' and `ruby-end-of-defun' are replaced by
912 appropriate settings for the variables `beginning-of-defun-function'
913 and `end-of-defun-function'.
915 **** Non-standard keybindings for `backward-kill-word', `comment-region',
916 `reindent-then-newline-and-indent' and `newline' have been removed.
920 *** Pairing of parens/quotes uses `electric-pair-mode' instead of skeleton-pair.
922 *** `sh-electric-here-document-mode' now controls auto-insertion of here-docs.
924 *** `sh-use-smie' lets you choose a new indentation and navigation code.
928 *** The free software compiler GHDL is supported (and now the default).
930 *** Support for the VHDL-AMS packages has been added/updated.
932 *** Updated to the 2002 revision of the VHDL standard.
934 *** Accepts \r and \f as whitespace.
938 *** The faces used by Apropos are now directly customizable.
939 These faces are named `apropos-symbol', `apropos-keybinding', and so on;
940 see the `apropos' Custom group for details.
942 *** The old options whose values specified faces to use have been removed
943 (i.e. `apropos-symbol-face', `apropos-keybinding-face', etc.).
947 *** This package has been rewritten to use Tabulated List mode.
949 *** Option `Buffer-menu-buffer+size-width' is now obsolete.
950 Use `Buffer-menu-name-width' and `Buffer-menu-size-width' instead.
954 *** Algebraic simplification mode is now the default.
955 To restrict to the limited simplifications given by the former
956 default simplification mode, use `m I'.
960 *** You can customize the header text that appears above each calendar month.
961 See the variable `calendar-month-header'.
963 *** New LaTeX calendar style, produced by `cal-tex-cursor-week2-summary'.
965 *** The calendars produced by cal-html include holidays.
966 Customize `cal-html-holidays' to change this.
970 *** The major modes from the parser generators "Bovine" and "Wisent"
971 are now properly integrated in Emacs. The file suffixes ".by" and ".wy"
972 are in `auto-mode-alist', and the corresponding manuals are included.
976 **** Menu support for the "Configuration" feature. This allows users to
977 choose the active configuration (such as debug or install) from the menu.
979 **** New command `ede-set' to interactively set project-local variables.
981 **** Support for compiling, debugging, and running in "generic" projects.
983 **** Autoconf editing support for M4 macros with complex arguments.
985 **** Compilation support for the "linux" project type.
987 **** "simple" projects have been removed; use "generic" projects instead.
991 **** Support for parsing #include statements inside a namespace in C/C++.
993 **** Improved support for 'extern "C"' declarations in C/C++.
995 **** The ability to ignore more common special C/C++ preprocessor symbols,
996 such as '__nonnull' and '__asm'. Add '__cplusplus' macro when parsing C++.
997 If available, include cdefs.h as an additional source of preprocessor symbols.
999 **** Improved C/C++ function pointer parsing.
1001 **** In Python, support for converting imports to include file names.
1003 **** Ability to dynamically determine the Python load path.
1005 **** Support for the Python 'WITH' and 'AT' keywords.
1007 **** Improved tooltip completion.
1011 **** The SRecode manual is now included.
1013 **** Tag generation supports constructor/destructor settings and system
1014 include differentiation.
1016 **** Addition of 'Framework' support: Frameworks are specified when a
1017 particular kind of library (such as Android) is needed in a common language
1020 **** Support for nested templates and let variables override based on priority.
1022 **** Support for merging tables from multiple related modes, such as
1023 default -> c++ -> arduino.
1025 ** Compile has a new option `compilation-always-kill'.
1029 *** `custom-reset-button-menu' now defaults to t.
1031 *** Non-option variables are never matched in `customize-apropos' and
1032 `customize-apropos-options' (i.e., the prefix argument does nothing for
1033 these commands now).
1037 *** The variables `term-default-fg-color' and `term-default-bg-color'
1038 are now deprecated in favor of the customizable face `term'.
1040 *** You can customize how to display ANSI terminal colors and styles
1041 by customizing the corresponding `term-color-<COLOR>',
1042 `term-color-underline' and `term-color-bold' faces.
1046 *** The syntax has been extended in order to allow ad-hoc proxy definitions.
1048 *** Remote processes are now also supported on remote MS-Windows hosts.
1052 *** Structs made by `url-generic-parse-url' have nil `attributes' slot.
1053 Previously, this slot stored semicolon-separated attribute-value pairs
1054 appended to some imap URLs, but this is not compatible with RFC 3986.
1055 So now the `filename' slot stores the entire path and query components,
1056 and the `attributes' slot is always nil.
1058 *** New function `url-encode-url' for encoding a URI string.
1059 The `url-retrieve' function now uses this to encode its URL argument,
1060 in case that is not properly encoded.
1062 ** notifications.el supports now version 1.2 of the Notifications API.
1063 The function `notifications-get-capabilities' returns the supported
1066 ** Flymake uses fringe bitmaps to indicate errors and warnings.
1067 See `flymake-fringe-indicator-position', `flymake-error-bitmap' and
1068 `flymake-warning-bitmap'.
1070 ** The FFAP option `ffap-url-unwrap-remote' can now be a list of strings,
1071 specifying URL types that should be converted to remote file names at
1072 the FFAP prompt. The default is now '("ftp").
1074 ** New Ibuffer `derived-mode' filter, bound to `/ M'.
1075 The old binding for `/ M' (filter by used-mode) is now bound to `/ m'.
1077 ** New option `mouse-avoidance-banish-position' specifies where the
1078 `banish' mouse avoidance setting moves the mouse.
1080 ** In Perl mode, new option `perl-indent-parens-as-block' causes non-block
1081 closing brackets to be aligned with the line of the opening bracket.
1083 ** In Proced mode, new command `proced-renice' renices marked processes.
1085 ** New option `async-shell-command-buffer' specifies the buffer to use
1086 for a new asynchronous `shell-command' when the default output buffer
1087 `*Async Shell Command*' is already in use.
1089 ** SQL mode has a new option `sql-db2-escape-newlines'.
1090 If non-nil, newlines sent to the command interpreter will be escaped
1091 by a backslash. The default does not escape the newlines and assumes
1092 that the sql statement will be terminated by a semicolon.
1094 ** New command `tabulated-list-sort', bound to `S' in Tabulated List mode
1095 (and modes that derive from it), sorts the column at point, or the Nth
1096 column if a numeric prefix argument is given.
1098 ** `which-func-modes' now defaults to t, so Which Function mode, when
1099 enabled, applies to all applicable major modes.
1101 ** `winner-mode-hook' now runs when the mode is disabled, as well as when
1104 ** Follow mode no longer works by using advice.
1105 The option `follow-intercept-processes' has been removed.
1107 ** `javascript-generic-mode' is now an obsolete alias for `js-mode'.
1109 ** Hooks renamed to avoid obsolete "-hooks" suffix:
1110 *** semantic-lex-reset-hooks -> semantic-lex-reset-functions
1111 *** semantic-change-hooks -> semantic-change-functions
1112 *** semantic-edits-new-change-hooks -> semantic-edits-new-change-functions
1113 *** semantic-edits-delete-change-hooks -> semantic-edits-delete-change-functions
1114 *** semantic-edits-reparse-change-hooks -> semantic-edits-reparse-change-functions
1115 *** semanticdb-save-database-hooks -> semanticdb-save-database-functions
1116 *** c-prepare-bug-report-hooks -> c-prepare-bug-report-hook
1117 *** rcirc-sentinel-hooks -> rcirc-sentinel-functions
1118 *** rcirc-receive-message-hooks -> rcirc-receive-message-functions
1119 *** rcirc-activity-hooks -> rcirc-activity-functions
1120 *** rcirc-print-hooks -> rcirc-print-functions
1121 *** dbus-event-error-hooks -> dbus-event-error-functions
1122 *** eieio-pre-method-execution-hooks -> eieio-pre-method-execution-functions
1123 *** checkdoc-style-hooks -> checkdoc-style-functions
1124 *** checkdoc-comment-style-hooks -> checkdoc-comment-style-functions
1125 *** archive-extract-hooks -> archive-extract-hook
1126 *** filesets-cache-fill-content-hooks -> filesets-cache-fill-content-hook
1127 *** hfy-post-html-hooks -> hfy-post-html-hook
1128 *** nndiary-request-create-group-hooks -> nndiary-request-create-group-functions
1129 *** nndiary-request-update-info-hooks -> nndiary-request-update-info-functions
1130 *** nndiary-request-accept-article-hooks -> nndiary-request-accept-article-functions
1131 *** gnus-subscribe-newsgroup-hooks -> gnus-subscribe-newsgroup-functions
1133 ** Obsolete packages
1136 In most cases, assoc+member+push+delq work just as well.
1137 And in any case it's just a terrible package: ugly semantics, terrible
1138 inefficiency, and not namespace-clean.
1147 * Incompatible Lisp Changes in Emacs 24.3
1149 ** Docstrings starting with `*' no longer indicate user options.
1150 Only variables defined using `defcustom' are considered user options.
1151 The function `user-variable-p' is now an obsolete alias for
1152 `custom-variable-p'.
1154 ** The return values of `defalias', `defun' and `defmacro' have changed,
1155 and are now undefined. For backwards compatibility, `defun' and
1156 `defmacro' currently return the name of the newly defined
1157 function/macro, but this should not be relied upon.
1159 ** `random' by default now returns a different random sequence in
1160 every Emacs run. Use `(random S)', where S is a string, to set the
1161 random seed to a value based on S, in order to get a repeatable
1162 sequence in later calls.
1164 ** If the NEWTEXT arg to `replace-match' contains a substring "\?",
1165 that substring is inserted literally even if the LITERAL arg is
1166 non-nil, instead of causing an error to be signaled.
1168 ** `select-window' now always makes the window's buffer current.
1169 It does so even if the window was selected before.
1171 ** The function `x-select-font' can return a font spec, instead of a
1172 font name as a string. Whether it returns a font spec or a font name
1173 depends on the graphical library.
1175 ** `face-spec-set' no longer sets frame-specific attributes when the
1176 third argument is a frame (that usage was obsolete since Emacs 22.2).
1178 ** `set-buffer-multibyte' now signals an error in narrowed buffers.
1180 ** The CL package's `get-setf-method' function no longer exists.
1181 Generalized variables are now part of core Emacs Lisp, and implemented
1182 differently to the way cl.el used to do it. It is not possible to
1183 define a compatible replacement for `get-setf-method'. See the file
1184 gv.el for internal details of the new implementation.
1186 ** The arguments of `dbus-register-signal' are no longer just strings,
1187 but keywords or keyword-string pairs. The old argument list will
1188 still be supported for Emacs 24.x.
1190 ** Miscellaneous name changes
1191 Some Lisp symbols have been renamed to correct their spelling,
1192 or to be more consistent with standard Emacs terminology.
1194 *** Renamed functions
1195 **** hangul-input-method-inactivate -> hangul-input-method-deactivate
1196 **** inactivate-input-method -> deactivate-input-method
1197 **** quail-inactivate -> quail-deactivate
1198 **** robin-inactivate -> robin-deactivate
1199 **** viper-inactivate-input-method -> viper-deactivate-input-method
1200 **** viper-inactivate-input-method-action ->
1201 viper-deactivate-input-method-action
1202 **** ucs-input-inactivate -> ucs-input-deactivate
1205 The old hooks are still supported for backward compatibility, but they
1206 are deprecated and will be removed eventually.
1207 **** input-method-inactivate-hook -> input-method-deactivate-hook
1208 **** robin-inactivate-hook -> robin-deactivate-hook
1209 **** quail-inactivate-hook -> quail-deactivate-hook
1211 *** Renamed variables
1212 **** follow-deactive-menu -> follow-inactive-menu
1213 **** inactivate-current-input-method-function ->
1214 deactivate-current-input-method-function
1216 ** Some obsolete functions, variables, and faces have been removed:
1217 *** `last-input-char', `last-command-char', `unread-command-char'
1218 *** `facemenu-unlisted-faces'
1219 *** `rmail-decode-mime-charset'
1220 *** `iswitchb-read-buffer'
1221 *** `sc-version', `sc-submit-bug-report'
1222 *** `set-char-table-default'
1223 *** `string-to-sequence' (use `string-to-list' or `string-to-vector')
1224 *** `compile-internal'
1226 *** `mode-line-inverse-video'
1227 *** `follow-mode-off-hook'
1228 *** `cvs-commit-buffer-require-final-newline'
1229 (use `log-edit-require-final-newline' instead)
1230 *** `cvs-changelog-full-paragraphs'
1231 (use `log-edit-changelog-full-paragraphs' instead)
1232 *** `cvs-diff-ignore-marks', `cvs-diff-buffer-name'
1233 *** `vc-ignore-vc-files' (use `vc-handled-backends' instead)
1234 *** `vc-master-templates' (use `vc-handled-backends' instead)
1235 *** `vc-checkout-carefully'
1238 * Lisp Changes in Emacs 24.3
1240 ** CL-style generalized variables are now in core Elisp.
1241 `setf' is autoloaded; `push' and `pop' accept generalized variables.
1242 You can define your own generalized variables using `gv-define-simple-setter',
1243 `gv-define-setter', etc.
1245 ** Emacs tries to macroexpand interpreted (non-compiled) files during load.
1246 This can significantly speed up execution of non-byte-compiled code,
1247 but can also bump into previously unnoticed cyclic dependencies.
1248 These are generally harmless: they will simply cause the macro calls
1249 to be left for later expansion (as before), but will result in a
1250 warning ("Eager macro-expansion skipped due to cycle") describing the cycle.
1251 You may wish to restructure your code so this does not happen.
1253 ** New sampling-based Elisp profiler.
1254 Try M-x profiler-start, do some work, and then call M-x profiler-report.
1255 When finished, use M-x profiler-stop. The sampling rate can be based on
1256 CPU time or memory allocations.
1258 ** `defun' also accepts a (declare DECLS) form, like `defmacro'.
1259 The interpretation of the DECLS is determined by `defun-declarations-alist'.
1261 ** New macros `setq-local' and `defvar-local'.
1263 ** Face underlining can now use a wave.
1265 ** `read-regexp' has a new argument HISTORY; the first argument PROMPT
1266 of `read-regexp' accepts a string ending with a colon and space, and its
1267 second argument DEFAULTS can be a list of strings accessible via `M-n'
1268 in the minibuffer ahead of other hard-coded useful regexp-related values.
1269 More commands use `read-regexp' now to read their regexp arguments.
1273 *** New function `completion-table-with-quoting' to handle completion
1274 in the presence of quoting, such as file completion in shell buffers.
1276 *** New function `completion-table-subvert' to use an existing completion
1277 table, but with a different prefix.
1281 *** New error type and new function `user-error'.
1282 These do not trigger the debugger.
1284 *** New option `debugger-bury-or-kill', saying what to do with the
1285 debugger buffer when exiting debug.
1287 *** Set `debug-on-message' to enter the debugger when a certain
1288 message is displayed in the echo area. This can be useful when trying
1289 to work out which code is doing something.
1291 *** New var `inhibit-debugger', automatically set to prevent accidental
1292 recursive invocations.
1296 *** New command `fit-frame-to-buffer' adjusts the frame height to
1299 *** The command `fit-window-to-buffer' can adjust the frame height
1300 if the new option `fit-frame-to-buffer' is non-nil.
1302 *** New macro `with-temp-buffer-window', similar to
1303 `with-output-to-temp-buffer'.
1305 *** `temp-buffer-resize-mode' no longer resizes windows that have been
1308 *** New option `switch-to-buffer-preserve-window-point' to restore a
1309 window's point when switching buffers.
1311 *** New display action alist entries `window-height' and `window-width'
1312 specify the size of new windows created by `display-buffer'.
1314 *** New display action alist entry `pop-up-frame-parameters', if
1315 non-nil, specifies frame parameters to give any newly-created frame.
1317 *** New display action alist entry `inhibit-switch-frame', if non-nil,
1318 tells display action functions to avoid changing which frame is
1321 *** New display action alist entry `previous-window', if non-nil,
1322 specifies window to reuse in `display-buffer-in-previous-window'.
1324 *** New display action functions `display-buffer-below-selected',
1325 and `display-buffer-in-previous-window'.
1327 *** The functions `get-lru-window', `get-mru-window' and `get-largest-window'
1328 now accept a third argument to avoid choosing the selected window.
1330 *** Additional values recognized for option `window-combination-limit'.
1332 *** The following variables are obsolete, as they can be replaced by
1333 appropriate entries in the `display-buffer-alist' function introduced
1335 **** `dired-shrink-to-fit'
1336 **** `display-buffer-reuse-frames'
1337 **** `display-buffer-function'
1338 **** `special-display-buffer-names'
1339 **** `special-display-frame-alist'
1340 **** `special-display-function'
1341 **** `special-display-regexps'
1345 *** `current-time-string' no longer requires that its argument's year
1346 must be in the range 1000..9999. It now works with any year supported
1347 by the underlying C implementation.
1349 *** `current-time' now returns extended-format time stamps
1350 (HIGH LOW USEC PSEC), where the new PSEC slot specifies picoseconds.
1351 PSEC is typically a multiple of 1000 on current machines. Other
1352 functions that use this format, such as `file-attributes' and
1353 `format-time-string', have been changed accordingly. Old-format time
1354 stamps are still accepted.
1356 *** The format of timers in `timer-list' and `timer-idle-list' is now
1357 [TRIGGERED-P HI-SECS LO-SECS USECS REPEAT-DELAY FUNCTION ARGS IDLE-DELAY PSECS].
1358 The PSECS slot is new, and uses picosecond resolution. It can be
1359 accessed via the new `timer--psecs' accessor.
1361 *** Last-modified time stamps in undo lists now are of the form
1362 (t HI-SECS LO-SECS USECS PSECS) instead of (t HI-SECS . LO-SECS).
1366 *** Improved security when handling persistent objects:
1368 **** `eieio-persistent-read' now features optional arguments for specifying
1369 the class to load, as well as a flag stating whether subclasses are allowed;
1370 if provided, other classes will be rejected by the reader. For
1371 compatibility with existing code, if the class is omitted only a
1374 **** New specialized reader for pulling in classes and signaling errors
1375 without evaluation of suspicious code.
1377 **** All slots that contain objects must have a :type. Slots with lists
1378 of objects must use a new type predicate for a list of an object type.
1380 *** Support for `find-function' and similar utilities, through the addition
1381 of filename support to generated symbols.
1383 ** Floating point functions now always return special values like NaN,
1384 instead of signaling errors, if given invalid args; e.g., (log -1.0).
1385 Previously, they returned NaNs on some platforms but signaled errors
1386 on others. The affected functions are acos, asin, tan, exp, expt,
1387 log, log10, sqrt, and mod.
1389 ** New fringe bitmap `exclamation-mark'.
1391 ** Miscellaneous changes to special forms and macros
1393 *** `defun' and `defmacro' are now macros rather than special forms.
1395 *** `kbd' is now a function rather than a macro.
1397 ** Miscellaneous new functions
1399 *** `set-temporary-overlay-map' sets up a temporary keymap that
1400 takes precedence over most other maps for a short while (normally one key).
1402 *** `autoloadp' tests if its argument is an autoloaded object.
1404 *** `autoload-do-load' performs the autoloading operation.
1406 *** `buffer-narrowed-p' tests if the buffer is narrowed.
1408 *** `file-name-base' returns a file name sans directory and extension.
1410 *** `function-get' fetches a function property, following aliases.
1412 *** `posnp' tests if an object is a `posn'.
1414 *** `system-users' returns the user names on the system.
1416 *** `system-groups' returns the group names on the system.
1418 *** `tty-top-frame' returns the topmost frame of a text terminal.
1420 ** The following functions and variables are obsolete:
1421 *** `automount-dir-prefix' (use `directory-abbrev-alist')
1422 *** `buffer-has-markers-at'
1423 *** `macro-declaration-function' (use `macro-declarations-alist')
1424 *** `window-system-version' (provides no useful information)
1425 *** `dired-pop-to-buffer' (use `dired-mark-pop-up')
1426 *** `query-replace-interactive'
1427 *** `font-list-limit' (has had no effect since Emacs < 23)
1430 * Changes in Emacs 24.3 on Non-Free Operating Systems
1432 ** Cygwin builds can use the native MS Windows user interface.
1433 Pass `--with-w32' to configure. The default remains the X11 interface.
1435 ** Two new functions are available in Cygwin builds:
1436 `cygwin-convert-file-name-from-windows' and
1437 `cygwin-convert-file-name-to-windows'. These functions allow Lisp
1438 code to access the Cygwin file-name mapping machinery to convert
1439 between Cygwin and Windows-native file and directory names.
1441 ** When invoked with the -nw switch to run on the Windows text-mode terminal,
1442 Emacs now supports `mouse-highlight', help-echo (in the echo area), and
1443 `mouse-autoselect-window'.
1445 ** On MS Windows Vista and later Emacs now supports symbolic links.
1447 ** On MS Windows, you can pass `--without-libxml2' to configure.bat to omit
1448 support for libxml2, even if its presence is detected.
1450 ** On Mac OS X, the Nextstep port requires OS X 10.4 or later.
1452 ** On Mac OS X, configure no longer automatically adds the Fink "/sw"
1453 directories to the search path. You must add them yourself if you want them.
1456 * Changes in Emacs 24.2
1458 ** This is mainly a bug-fix release.
1461 * Installation Changes in Emacs 24.1
1463 ** Emacs can be compiled with Gtk+ 3.0 if you pass --with-x-toolkit=gtk3
1464 to configure. Note that other libraries used by Emacs, RSVG and GConf,
1465 also depend on Gtk+. You can disable them with --without-rsvg and
1468 ** Emacs can be compiled with GnuTLS support.
1469 This happens by default if a suitably recent version of the library is
1470 found at build time. To prevent this, use the configure option
1471 `--without-gnutls'. See below for GnuTLS features.
1473 ** Emacs can be compiled with SELinux support.
1474 This happens by default if a suitably recent version of the library is
1475 found at build time. To prevent this, use the configure option
1476 `--without-selinux'. See below for SELinux features.
1478 ** Emacs can be compiled with ImageMagick support.
1479 This happens by default if a suitably recent version of the library is
1480 found at build time. To prevent this, use the configure option
1481 `--without-imagemagick'. See below for ImageMagick features.
1482 This feature is not available for the Nextstep or MS ports.
1484 ** Emacs can be compiled with libxml2 support.
1485 This happens by default if a suitably recent version of the library is
1486 found at build time. To prevent this, use the configure option
1487 `--without-xml2'. See below for libxml2 features.
1489 ** By default, the installed Info and man pages are compressed.
1490 You can disable this by configuring --without-compress-info.
1492 ** New configure option --with-wide-int.
1493 With it, Emacs integers typically have 62 bits, even on 32-bit machines.
1494 On 32-bit hosts, this raises the limit on buffer sizes from about 512 MiB
1497 ** New configure options: --with-mmdf, --with-mail-unlink, --with-mailhost.
1498 These provide no new functionality, they just remove the need to edit
1499 lib-src/Makefile by hand in order to use the associated features.
1501 ** New configure option --enable-use-lisp-union-type.
1502 This is only useful for Emacs developers to debug certain types of bugs.
1503 This is not a new feature; only the configure flag is new.
1505 ** The standalone programs digest-doc and sorted-doc are removed.
1506 Emacs now uses Lisp commands `doc-file-to-man' and `doc-file-to-info'.
1508 ** The standalone program `fakemail' is removed.
1509 If you need it, feedmail.el provides a superset of the functionality.
1512 * Startup Changes in Emacs 24.1
1514 ** The --unibyte, --multibyte, --no-multibyte, and --no-unibyte
1515 command line arguments, and the EMACS_UNIBYTE environment variable, no
1516 longer have any effect. (They were declared obsolete in Emacs 23.)
1518 ** New command line option `--no-site-lisp' removes site-lisp directories
1519 from load-path. -Q now implies this. This option does not affect the
1520 EMACSLOADPATH environment variable (and hence has no effect for
1524 * Changes in Emacs 24.1
1528 *** Many packages now use the `completion-at-point' command,
1529 rather than implementing separate completion commands.
1531 *** `completion-at-point' now handles tags and semantic completion.
1533 *** Completion in a non-minibuffer now tries to detect the end of completion
1534 and pops down the *Completions* buffer accordingly.
1536 *** New option `completion-cycle-threshold' allows completion cycling.
1538 *** New option `completion-category-overrides' for overriding the
1539 default completion style in certain circumstances.
1541 *** New completion style `substring'.
1543 *** Completion of buffer names uses `substring' completion by default.
1545 *** The option `widget-complete-field' has been removed.
1549 *** The first time you try sending mail, Emacs asks for a mail method.
1550 This is implemented by a new default for `send-mail-function', which
1551 is `sendmail-query-once'. This offers to use the smtpmail package, or
1552 to use the old defaults relying on external mail facilities
1553 (`sendmail-send-it' on GNU/Linux and other Unix-like systems, and
1554 `mailclient-send-it' on Windows).
1556 *** Typing `C-c m' in the buffer made by `M-x report-emacs-bug'
1557 transfers the report to your desktop's preferred mail client, if there
1558 is one. This uses either the "xdg-email" utility, or Mac OS's "open"
1561 *** See Changes in Specialized Modes and Packages for SMTPmail changes
1562 and Mail mode changes
1564 ** Emacs server and client changes
1566 *** New option `server-port' specifies the port for TCP Emacs servers.
1568 *** New emacsclient argument -q/--quiet suppresses some status messages.
1570 *** New emacsclient argument --frame-parameters specifies the frame
1571 parameters of any newly-created graphical frame.
1573 *** If emacsclient shuts down due to Emacs signaling an error,
1574 its exit status is 1.
1576 *** New emacsclient argument --parent-id ID.
1577 This opens a client frame in parent X window ID, via XEmbed, similar
1578 to the --parent-id argument to Emacs.
1580 ** Internationalization changes
1582 *** Emacs now supports display and editing of bidirectional text.
1583 Right-to-left (RTL) scripts, such as Arabic, Farsi, and Hebrew, are
1584 displayed in the correct visual order as expected by users of those
1585 scripts. The display reordering is a "full bidirectionality" class
1586 implementation of the Unicode Bidirectional Algorithm (UBA). Buffers
1587 with no RTL text should look exactly the same as before.
1589 **** New buffer-local variable `bidi-display-reordering'.
1590 To disable display reordering in a buffer, change this to nil.
1592 **** New buffer-local variable `bidi-paragraph-direction'.
1593 If nil (the default), Emacs determines the base direction of each
1594 paragraph from its text, as specified by the UBA. Setting the value
1595 to `right-to-left' or `left-to-right' forces a base direction on each
1598 Paragraphs with right-to-left base direction are displayed starting at
1599 the right window edge.
1601 *** Enhanced support for characters with no glyphs in available fonts,
1602 or, on text terminals, characters that cannot be encoded by the
1603 terminal coding system. The new option `glyphless-char-display-control'
1604 specifies how to display them: as a hexadecimal code in a box, a thin
1605 1-pixel space, an empty box, etc.
1607 *** New input methods for Farsi and Bulgarian
1608 (farsi-isiri-9147, farsi-transliterate-banan, bulgarian-alt-phonetic).
1610 *** `nobreak-char-display' now also highlights Unicode hyphen chars
1611 (U+2010 and U+2011).
1613 *** New Hebrew translation of the Emacs Tutorial.
1614 Type `C-u C-h t' to choose it in case your language setup doesn't
1615 automatically select it.
1617 ** An Emacs Lisp package manager is now included.
1618 This is a convenient way to download and install additional packages,
1619 from a package repository at http://elpa.gnu.org.
1621 *** M-x list-packages shows a list of packages, which can be
1622 selected for installation.
1624 *** New command `describe-package', bound to `C-h P'.
1626 *** By default, all installed packages are loaded automatically when
1627 Emacs starts up. To disable this, set `package-enable-at-startup' to
1628 nil. To specify the packages to load, customize `package-load-list'.
1630 ** Custom theme changes
1632 *** New command `M-x customize-themes', which provides a convenient
1633 interface for enabling and disabling Custom themes.
1635 *** New option `custom-theme-load-path' is the load path for themes.
1636 Emacs no longer looks for Custom themes in `load-path'. The default
1637 value of `custom-theme-load-path' says to look for themes in
1638 `custom-theme-directory', followed by a subdirectory of
1639 `data-directory' named "themes/", which contains a small selection of
1640 built-in Custom themes.
1642 *** New option `custom-safe-themes' records known-safe theme files.
1643 If a theme is not in this list, Emacs queries before loading it, and
1644 offers to save the theme to `custom-safe-themes' automatically. By
1645 default, all themes included in Emacs are treated as safe.
1647 ** Improved GTK integration
1649 *** GTK scroll-bars are now placed on the right by default.
1650 The function `set-scroll-bar-mode' can change this.
1652 *** GTK tool bars can have just text, just images or images and text.
1653 Customize `tool-bar-style' to choose the style. On a Gnome desktop,
1654 the default is taken from desktop settings.
1656 *** GTK tool bars can be placed on any edge of the frame.
1657 The frame-parameter tool-bar-position controls this. It takes the
1658 values top, left, right or bottom. The Options => Show/Hide menu has
1661 *** The default colors for selected text (the `region' face) are taken
1662 from the GTK theme when Emacs is built with GTK.
1664 *** Emacs uses GTK tooltips by default if built with GTK.
1665 You can disable this by changing `x-gtk-use-system-tooltips' to nil.
1667 ** Graphical interface changes
1669 *** On graphical displays, the mode-line no longer ends in dashes.
1670 Also, the first dash (which does not indicate anything) is just
1671 displayed as a space.
1673 *** `menu-bar-select-buffer-function' lets you choose another operation
1674 instead of `switch-to-buffer' when selecting an item in the Buffers menu.
1676 *** Lucid menus and dialogs can display antialiased fonts if Emacs is
1677 built with Xft. These fonts can be set via X resources, for example:
1678 Emacs.pane.menubar.font: Courier-12
1682 *** Emacs now calls `kill-emacs' if it receives SIGTERM or SIGHUP,
1683 or if it receives a SIGINT signal in batch mode.
1685 *** `kill-emacs-hook' is now also run in batch mode.
1686 Third-party code which adds to `kill-emacs-hook' should check if they
1687 do the right thing in batch mode.
1689 ** Scrolling changes
1691 *** New scrolling commands `scroll-up-command' and `scroll-down-command'
1692 (bound to C-v/[next] and M-v/[prior]) do not signal errors at top/bottom
1693 of buffer at first key-press (instead they move to top/bottom of buffer)
1694 when `scroll-error-top-bottom' is non-nil.
1696 *** New option `scroll-error-top-bottom' (see above).
1698 *** New scrolling commands `scroll-up-line' and `scroll-down-line'
1699 scroll a line instead of full screen.
1701 *** New property `scroll-command' should be set on a command's symbol to
1702 define it as a scroll command affected by `scroll-preserve-screen-position'.
1704 *** If you customize `scroll-conservatively' to a value greater than 100,
1705 Emacs will never recenter point in the window when it scrolls due to
1706 cursor motion commands or commands that move point (e.f., `M-g M-g').
1707 Previously, you needed to use `most-positive-fixnum' as the value of
1708 `scroll-conservatively' to achieve the same effect.
1710 *** "Aggressive" scrolling now honors the scroll margins.
1711 If you customize `scroll-up-aggressively' or
1712 `scroll-down-aggressively' and move point off the window, Emacs now
1713 scrolls the window so as to avoid positioning point inside the scroll
1716 ** Basic SELinux support has been added.
1717 This requires Emacs to be linked with libselinux at build time.
1719 *** Emacs preserves the SELinux file context when backing up.
1720 Also, the function `copy-file' has an extra optional argument for
1721 preserving SELinux context, and the return value of `backup-buffer'
1722 now includes the SELinux context.
1724 *** New functions `file-selinux-context' and `set-file-selinux-context'
1725 get and set the SELinux context of a file.
1729 *** `delete-by-moving-to-trash' now only affects commands that specify
1730 trashing. This avoids inadvertently trashing temporary files.
1732 *** Calling `delete-file' or `delete-directory' with a prefix argument
1733 now forces true deletion, regardless of `delete-by-moving-to-trash'.
1735 ** File- and directory-local variable changes
1737 *** You can stop directory local vars from applying to subdirectories.
1738 Add an element (subdirs . nil) to the alist portion of any variables
1739 settings to indicate that the section should not apply to
1742 *** Directory local variables can apply to some file-less buffers.
1743 Affected modes include dired, vc-dir, and log-edit. For example,
1744 adding "(diff-mode . ((mode . whitespace)))" to .dir-locals.el will
1745 turn on `whitespace-mode' for *vc-diff* buffers. Modes should call
1746 `hack-dir-local-variables-non-file-buffer' to support this.
1748 *** Using "mode: MINOR-MODE" to enable a minor mode is deprecated.
1749 Instead, use "eval: (minor-mode 1)".
1751 *** The variable `inhibit-first-line-modes-regexps' has been renamed
1752 to `inhibit-local-variables-regexps'. As the name suggests, it now
1753 applies to ALL file local variables, not just -*- lines. The
1754 associated `inhibit-first-line-modes-suffixes' has been renamed in the
1759 *** The `quit-window' command now restores the last buffer displayed
1760 in the quitted window.
1762 *** Resizing an Emacs frame now preserves proportional window sizes,
1763 modulo restrictions like window minimum sizes and fixed-size windows.
1765 *** The behavior of `display-buffer' is now customizable in detail.
1767 **** New option `display-buffer-base-action' specifies a list of
1768 user-determined display "actions" (functions and optional arguments
1769 for choosing the displaying window).
1771 This takes precedence over the default display action, which is
1772 specified by `display-buffer-fallback-action'.
1774 **** New option `display-buffer-alist' maps buffer name regexps to
1775 display actions, taking precedence over `display-buffer-base-action'.
1777 *** New option `window-combination-limit'.
1778 The new option `window-combination-limit' allows to return the space
1779 obtained for resizing or creating a window more reliably to the window
1780 from which such space was obtained.
1782 *** New option `window-combination-resize'.
1783 The new option `window-combination-resize' allows to split a window that
1784 otherwise cannot be split because it's too small by stealing space from
1785 other windows in the same combination. Subsequent resizing or deletion
1786 of the window will resize all windows in the same combination as well.
1788 *** New option `frame-auto-hide-function' lets you choose between
1789 iconifying or deleting a frame when burying a buffer in a dedicated
1790 frame, or quitting a window showing a buffer in a frame of its own.
1792 *** New commands `maximize-window' and `minimize-window'.
1793 These maximize and minimize the size of a window within its frame.
1795 *** New commands `switch-to-prev-buffer' and `switch-to-next-buffer'.
1796 These functions allow to navigate through the live buffers that have
1797 been shown in a specific window.
1799 ** Minibuffer changes
1801 *** The inactive minibuffer has its own major mode `minibuffer-inactive-mode'.
1802 This is handy for minibuffer-only frames, and is also used for the feature
1803 where mouse-1 pops up *Messages*"', which can now easily be changed.
1805 *** Minibuffers set `truncate-lines' to nil.
1806 If you want to change the value to something else, you could use
1807 for example `minibuffer-setup-hook'.
1809 ** `auto-mode-case-fold' is now enabled by default.
1811 ** `backup-by-copying-when-mismatch' now defaults to t.
1813 ** New basic faces `error', `warning', `success'.
1814 These are used to highlight text indicating failure, caution or
1815 successful operation.
1817 ** New option `list-colors-sort' defines the color sort order
1818 for `list-colors-display'.
1820 ** The variable `focus-follows-mouse' now always defaults to nil.
1823 * Editing Changes in Emacs 24.1
1827 *** C-y in Isearch is now bound to `isearch-yank-kill', instead of
1828 `isearch-yank-line'.
1830 *** M-y in Isearch is now bound to `isearch-yank-pop', instead of
1831 `isearch-yank-kill'.
1833 *** M-s C-e in Isearch is now bound to `isearch-yank-line'.
1835 ** New commands `count-words-region' and `count-words'.
1837 *** M-= is bound to `count-words-region', not `count-lines-region'.
1838 The `count-words-region' command, when called interactively, reports
1839 the number of lines, words, and characters in the region. It is a
1840 superset of the old `count-lines-region', which is now an obsolete
1843 ** The command `just-one-space' (M-SPC), if given a negative argument,
1844 also deletes newlines around point.
1848 *** New option `delete-active-region'.
1849 If non-nil, [delete] and DEL delete the region if it is active and no
1850 prefix argument is given. If set to `kill', those commands kill
1853 *** New command `delete-forward-char', bound to [delete].
1854 This is meant for interactive use, and obeys `delete-active-region'.
1855 The command `delete-char' does not obey `delete-active-region'.
1857 *** `delete-backward-char' is now a Lisp function.
1858 Apart from obeying `delete-active-region', its behavior is unchanged.
1859 However, the byte compiler now warns if it is called from Lisp; Lisp
1860 callers should use delete-char with a negative argument instead.
1862 *** The option `mouse-region-delete-keys' has been deleted.
1864 ** Selection changes.
1866 The default handling of clipboard and primary selections has been
1867 changed to conform with modern X applications. In short, most
1868 commands for killing and yanking text now use the clipboard, while
1869 mouse commands use the primary selection.
1871 In the following, we provide a list of these changes, followed by a
1872 list of steps to get the old behavior back if you prefer that.
1874 *** `select-active-regions' now defaults to t.
1875 Merely selecting text (e.g. with drag-mouse-1) no longer puts it in
1876 the kill ring. The selected text is put in the primary selection, if
1877 the system possesses a separate primary selection facility (e.g. X).
1879 **** `select-active-regions' also accepts a new value, `only'.
1880 This means to only set the primary selection for temporarily active
1881 regions (usually made by mouse-dragging or shift-selection);
1882 "ordinary" active regions, such as those made with C-SPC followed by
1883 point motion, do not alter the primary selection.
1885 **** `mouse-drag-copy-region' now defaults to nil.
1887 *** mouse-2 is now bound to `mouse-yank-primary'.
1888 This pastes from the primary selection, ignoring the kill-ring.
1889 Previously, mouse-2 was bound to `mouse-yank-at-click'.
1891 *** `x-select-enable-clipboard' now defaults to t on all platforms.
1893 *** `x-select-enable-primary' now defaults to nil.
1894 Thus, commands that kill text or copy it to the kill-ring (such as
1895 M-w, C-w, and C-k) also use the clipboard---not the primary selection.
1897 **** The "Copy", "Cut", and "Paste" items in the "Edit" menu are now
1898 exactly equivalent to M-w, C-w, and C-y respectively.
1900 **** Note that on MS-Windows, `x-select-enable-clipboard' was already
1901 non-nil by default, as Windows does not support the primary selection
1902 between applications.
1904 *** To return to the previous behavior, do the following:
1906 **** Change `select-active-regions' to nil.
1907 **** Change `mouse-drag-copy-region' to t.
1908 **** Change `x-select-enable-primary' to t (on X only).
1909 **** Change `x-select-enable-clipboard' to nil.
1910 **** Bind `mouse-yank-at-click' to mouse-2.
1912 *** Support for X cut buffers has been removed.
1914 *** X clipboard managers are now supported.
1915 To inhibit this, change `x-select-enable-clipboard-manager' to nil.
1917 ** New command `C-x r N' (`rectangle-number-lines') numbers the lines
1918 in the current rectangle. With a prefix argument, this prompts for a
1919 number to count from and for a format string.
1921 ** `redisplay-dont-pause' now defaults to t.
1922 This makes Emacs feel more responsive to editing commands that arrive
1923 at high rate, e.g. if you lean on some key, because stopping redisplay
1924 in the middle (when this variable is nil) forces more expensive
1925 updates later on, and Emacs appears to be unable to keep up.
1927 ** The behavior of <TAB> for active regions in Text mode has changed.
1928 In Text and related modes, typing <TAB> (`indent-for-tab-command')
1929 when the region is active causes Emacs to indent all the lines in the
1930 region, aligning them with the line previous to the first line in the
1931 region (or with the left margin if there is no previous line).
1933 ** When `occur' is called with a prefix argument, matching strings are
1934 collected into the `*Occur*' buffer without line numbers. If there
1935 are parenthesized subexpressions in the specified regexp, `occur'
1936 reads replacement text that may contain \\& and \\N whose convention
1937 follows `replace-match'.
1940 * Changes in Specialized Modes and Packages in Emacs 24.1
1942 ** Archive Mode has basic support for browsing and updating 7z archives.
1946 *** BibTeX mode now supports biblatex.
1947 Use the variable `bibtex-dialect' to select different BibTeX dialects.
1948 `bibtex-entry-field-alist' is now an obsolete alias for
1949 `bibtex-BibTeX-entry-alist'.
1951 *** New command `bibtex-search-entries', bound to C-c C-a.
1953 *** New `bibtex-entry-format' option `sort-fields', disabled by default.
1955 *** New variable `bibtex-search-entry-globally'.
1959 *** New option `browse-url-mailto-function' specifies how to handle "mailto:"s.
1961 *** The default browser used by the package is now the "xdg-open" program,
1962 on platforms that support it. This calls your desktop's preferred browser.
1966 *** Support for musical notes.
1968 *** Support for logarithmic units.
1970 *** No longer uses the tex prefix for TeX specific unit names when
1971 using TeX or LaTeX mode.
1973 *** New option to highlight selections using faces.
1975 *** `calc-histogram' has the option of using a vector to determine the bins.
1977 *** New "O" option prefix.
1979 *** Use the "O" prefix to "d r" (`calc-radix') to turn on twos-complement mode.
1981 ** Calendar, Diary, and Appt
1983 *** Diary entries can contain non-printing "comments".
1984 See the variable `diary-comment-start'.
1986 *** Appointments can specify their individual warning times.
1987 See the variable `appt-warning-time-regexp'.
1989 *** The function specified by `appt-disp-window-function' may be passed
1990 lists of arguments if multiple appointments are due at similar times.
1991 If you are using a custom function for this, you should update it.
1993 *** New function `diary-hebrew-birthday'.
1995 *** Elements of `calendar-day-abbrev-array' and `calendar-month-abbrev-array'
1996 may no longer be nil, but must all be strings.
1998 *** The obsolete (since Emacs 22.1) method of enabling the appt
1999 package by adding `appt-make-list' to `diary-hook' has been removed.
2000 Use `appt-activate' instead.
2002 *** Some appt variables (obsolete since Emacs 22.1) have been removed:
2003 appt-issue-message (use the function appt-activate)
2004 appt-visible/appt-msg-window (use the variable appt-display-format)
2006 *** Some diary function aliases (obsolete since Emacs 22.1) have been removed:
2007 view-diary-entries, list-diary-entries, show-all-diary-entries
2011 *** New feature to "guess" the style in an existing buffer.
2012 The main entry point is M-x c-guess.
2014 *** Java Mode now supports Java 5.0 (Tiger) and 6 (Mustang).
2016 *** `c-beginning-of-defun' and `c-end-of-defun' now respect nested scopes.
2017 Thus C-M-a will, by default, go to the beginning of the immediate function,
2020 *** "Macros with semicolons" can be registered for correct indentation.
2021 Where such a macro ends a line (no semicolon) the next statement is no longer
2022 parsed as a statement continuation.
2024 ** Comint and modes derived from it use the standard completion code.
2028 *** Compilation mode can be used without Font Lock mode.
2029 `compilation-parse-errors-function' is now obsolete.
2031 *** New variable `compilation-filter-start', which is bound while
2032 `compilation-filter-hook' runs. It records the start position of the
2033 text inserted by `compilation-filter'.
2035 *** `compilation-error-screen-columns' and `compilation-first-column'
2036 are obeyed in the editing buffer. So programming language modes can
2037 set them, whereas previously only the value in the *Compilation*
2042 *** Customize buffers now contain a search field.
2043 The search is performed using `customize-apropos'.
2044 To turn off the search field, set `custom-search-field' to nil.
2046 *** Options in customize group buffers start out hidden if not customized.
2047 Use the arrow to the left of the option name to toggle visibility.
2049 *** custom-buffer-sort-alphabetically now defaults to t.
2051 *** The color widget now has a "Choose" button, which allows you to
2052 choose a color via `list-colors-display'.
2056 *** It is now possible to access buses other than the default system
2059 *** The `dbus-register-method' and `dbus-register-property' functions
2060 optionally do not register names.
2062 *** The new function `dbus-register-service' registers a known service
2063 name on a D-Bus without also registering a property or a method.
2067 *** C-x C-j (`dired-jump') and C-x 4 C-j (`dired-jump-other-window'),
2068 if called with a prefix argument, read a file name from the minibuffer
2069 instead of using the current buffer.
2071 *** The "dired local variables" feature of Dired-x is obsolete.
2072 The standard directory local variables feature replaces it.
2076 *** New options `erc-autojoin-timing' and `erc-autojoin-delay',
2077 controlling attempts to autojoin a channel.
2079 *** New variable `erc-coding-system-precedence': If we use `undecided'
2080 as the server coding system, this variable will then be consulted.
2081 The default is to decode strings that can be decoded as utf-8 as
2082 utf-8, and do the normal `undecided' decoding for the rest.
2086 *** The default value of `eshell-directory-name' has changed
2087 to be an "eshell" directory in `user-emacs-directory'.
2088 The old "~/.eshell/" directory is still used if it exists, though.
2092 *** The M-x gdb command now uses the GDB Machine Interface protocol.
2093 It now supports multithread non-stop debugging and simultaneous
2094 debugging of several threads.
2098 *** RET (`image-toggle-animation') toggles animation, if applicable.
2099 Animation plays once, unless the option `image-animate-loop' is non-nil.
2103 *** New command M-x info-display-manual displays a named Info manual.
2104 If that manual is already visited in some Info buffer, it displays
2105 that buffer. (This is handy if you have many manuals in many *info*
2106 buffers, and don't remember the name of the buffer visiting the manual
2107 you want to consult.) Otherwise, it loads and displays the manual.
2109 *** `e' is now bound to `end-of-buffer' rather than to `Info-edit'.
2110 This is for compatibility with the stand-alone Info reader program,
2111 and also because `Info-edit' is a rarely used command that is disabled
2114 ** Mail mode changes (not Message mode)
2116 *** New command M-x mail-add-attachment for adding MIME attachments
2118 *** The command M-x mail-attach-file was renamed to M-x mail-insert-file.
2119 (Its name is misleading, since it has nothing to do with MIME
2120 attachments.) The old name is now an obsolete alias to the new name.
2122 ** MH-E has been updated to MH-E version 8.3.1.
2123 See MH-E-NEWS for details.
2125 ** Modula-2 mode provides auto-indentation.
2127 ** mpc.el: Can use pseudo tags of the form tag1|tag2 as a union of two tags.
2129 ** nXML mode no longer binds C-RET to `nxml-complete'.
2130 Completion is now performed via `completion-at-point', bound to C-M-i
2131 or M-TAB. If `nxml-bind-meta-tab-to-complete-flag' is non-nil (the
2132 default), this performs tag completion.
2134 ** Org mode has been updated to version 7.8.09.
2135 See ORG-NEWS for details.
2137 ** Prolog mode has been completely revamped, with lots of additional
2138 functionality such as more intelligent indentation, electricity,
2139 support for more variants, including Mercury, and a lot more.
2143 *** The command `rmail-epa-decrypt' decrypts OpenPGP data
2144 in the Rmail incoming message.
2146 *** The variable `rmail-message-filter' no longer has any effect.
2147 This change was made in Emacs 23.1 but was not advertised at the time.
2148 Try using `rmail-show-message-hook' instead.
2152 *** M-x shell prompts for the shell path name if the default directory
2153 is a remote file name and neither the environment variable $ESHELL nor
2154 the variable `explicit-shell-file-name' is set.
2156 *** TAB is now bound to the standard `completion-at-point' command,
2157 which now implements the pcomplete rules for shell command completion.
2161 *** SMTPmail now uses encrypted connections (via STARTTLS) by default
2162 if the mail server supports them. This uses either built-in GnuTLS
2163 support, or the starttls.el library. Customize `smtpmail-stream-type'
2166 *** The variable `smtpmail-auth-credentials' has been removed.
2167 By default, the information is now stored in the file ~/.authinfo.
2168 This was the default value of smtpmail-auth-credentials. If you had
2169 customized smtpmail-auth-credentials to a list of user names and
2170 passwords, those settings are not used. During your first connection
2171 to the smtp server, Emacs will prompt for the user name and password,
2172 and offer to save them to ~/.authinfo. Or you can manually copy the
2173 credentials to ~/.authinfo. For example, if you had
2175 (setq smtpmail-auth-credentials
2176 '(("mail.example.org" 25 "jim" "s!cret")))
2178 then the equivalent line in ~/.authinfo would be
2180 machine mail.example.org port 25 login jim password s!cret
2182 See the auth-source manual for more information, e.g. on encrypting
2183 the credentials file.
2185 *** The variable `smtpmail-starttls-credentials' has been removed.
2186 If you had that set, you need to put
2188 machine smtp.whatever.foo port 25 key "~/.my_smtp_tls.key" cert "~/.my_smtp_tls.cert"
2190 in your ~/.authinfo file instead.
2192 *** SMTPmail defaults to using the address in the From: header as the
2193 SMTP MAIL FROM envelope. To override this, set `mail-envelope-from'
2194 to the address you wish to use instead.
2198 *** New options `sql-port', `sql-connection-alist', `sql-send-terminator',
2199 and `sql-oracle-scan-on'.
2201 *** New options controlling prompting for login parameters.
2202 Each supported product has a custom variable `sql-*-login-params',
2203 which is a list of the parameters to be prompted for before a
2204 connection is established.
2206 *** The command `sql-product-interactive' now takes a prefix argument,
2207 which causes it to prompt for an SQL product.
2209 *** Product-specific SQL interactive commands now take prefix arguments.
2210 These commands (`sql-sqlite', `sql-postgres', `sql-mysql', etc.),
2211 given a prefix argument, prompt for a name for the SQL interactive
2212 buffer. This reduces the need for calling `sql-rename-buffer'.
2214 *** SQL interactive modes suppress command continuation prompts, and
2215 replace tabs with spaces. The first change impacts multiple line SQL
2216 statements entered with C-j between each line, statements yanked into
2217 the buffer and statements sent with `sql-send-*' functions. The
2218 second prevents the MySQL and Postgres interpreters from listing
2219 object name completions when sent text via `sql-send-*' functions.
2221 *** New command `sql-connect' starts a predefined SQLi session,
2222 using the login parameters from `sql-connection-alist'.
2224 *** New "Save Connection" menu item in SQLi buffers.
2225 This gathers the login params specified for the SQLi session, if it
2226 was not started by a connection, and saves them as a new connection.
2228 *** New commands for listing database objects and details:
2229 sql-list-all and sql-list-table.
2231 *** An API for manipulating SQL product definitions has been added.
2235 *** latex-electric-env-pair-mode keeps \begin..\end matched on the fly.
2239 *** New inline access method "ksu" (kerberized su).
2241 *** The following access methods are discontinued: "ssh1_old",
2242 "ssh2_old", "scp1_old", "scp2_old", "imap", "imaps" and "fish".
2244 *** The user option `remote-file-name-inhibit-cache' controls whether
2245 remote file attributes are cached for better performance.
2247 *** The option `ange-ftp-binary-file-name-regexp' has changed its
2248 default value to "".
2250 *** Handlers for `file-selinux-context' and `set-file-selinux-context'
2251 for remote machines which support SELinux.
2253 ** New function `url-queue-retrieve', which behaves like url-retrieve,
2254 but with limits (`url-queue-parallel-processes', `url-queue-timeout') on
2255 the degree of parallelism.
2257 ** VC and related modes
2259 *** Support for pulling on distributed version control systems.
2260 The command C-x v + (`vc-pull') runs a "pull" operation, if it is
2261 supported (currently with Bzr, Git, and Mercurial), to update the
2262 current branch and working tree. A prefix argument means to prompt
2263 the user for specifics, e.g. a pull location.
2265 *** `vc-update' is now an alias for `vc-pull'.
2267 *** Support for merging on distributed version control systems.
2268 The command C-x v m (`vc-merge') now runs a "merge" operation, if it
2269 is supported (currently with Bzr, Git, and Mercurial), to merge
2270 changes from another branch into the current one. It prompts for
2271 specifics, e.g. a merge source.
2273 *** New option `vc-revert-show-diff' controls whether `vc-revert'
2274 shows a diff while querying the user. It defaults to t.
2276 *** Log entries in some Log View buffers can be toggled to display a
2277 longer description by typing RET (log-view-toggle-entry-display).
2278 This is currently supported for Bzr, Git, and Mercurial (to support
2279 another backend, define a `log-view-expanded-log-entry-function').
2280 In the Log View buffers made by C-x v L (`vc-print-root-log'), you can
2281 use this to display the full log entry for the revision at point.
2283 *** New command `vc-ediff' allows visual comparison of two revisions
2284 of a file similar to `vc-diff', but using ediff backend.
2286 *** The option `vc-initial-comment' was removed in Emacs 23.2, but
2287 this was not advertised at the time.
2289 *** `vc-toggle-read-only' is an obsolete alias for `toggle-read-only'.
2290 Since Emacs 23, it has done the same thing as `toggle-read-only', but
2291 this was not advertised at the time.
2297 *** erc-hecomplete.el (use erc-pcomplete.el instead)
2299 *** partial-completion-mode (complete.el) is obsolete.
2300 You can get a comparable behavior with:
2301 (setq completion-styles '(partial-completion initials))
2302 (setq completion-pcm-complete-word-inserts-delimiters t)
2304 *** pc-mode.el is obsolete (CUA mode is much more comprehensive).
2306 *** pgg is obsolete (use EasyPG instead).
2308 *** sregex.el is obsolete, since rx.el is a strict superset.
2310 *** s-region.el and pc-select.el are obsolete.
2311 They are superseded by shift-select-mode, enabled by default since 23.1.
2313 *** vc-mcvs.el is obsolete (for lack of a maintainer).
2317 *** The Landmark game is now invoked with `landmark', not `lm'.
2318 Its functions and variables have been similarly renamed.
2320 *** In `ido-file-completion-map', C-v is no longer bound to `ido-toggle-vc'.
2321 (This interfered with cua-mode.)
2323 *** f90.el has some support for Fortran 2008 syntax.
2325 *** `copyright-fix-years' can optionally convert consecutive years to ranges.
2327 *** New command `nato-region' converts text to NATO phonetic alphabet.
2330 * New Modes and Packages in Emacs 24.1
2332 ** Occur Edit mode applies edits made in *Occur* buffers to the
2333 original buffers. It is bound to "e" in Occur mode.
2335 ** New global minor mode electric-pair-mode.
2336 When enabled, typing an open parenthesis automatically inserts the
2337 matching closing one.
2339 ** New global minor mode electric-indent-mode.
2340 When enabled, typing certain characters triggers reindentation.
2341 Major modes wishing to use this can set electric-indent-chars or
2342 electric-indent-functions.
2344 ** New global minor mode electric-layout-mode.
2345 When enabled, typing certain characters automatically inserts newlines.
2346 Major modes wishing to use this can set electric-layout-rules.
2348 ** tabulated-list.el provides a generic major mode for tabulated data,
2349 from which other modes can be derived.
2351 ** pcase.el provides the ML-style pattern matching macro `pcase'.
2353 ** secrets.el is an implementation of the Secret Service API, an
2354 interface to password managers like GNOME Keyring or KDE Wallet. The
2355 Secret Service API requires D-Bus for communication. The command
2356 `secrets-show-secrets' offers a buffer with a visualization of the
2359 ** notifications.el provides an implementation of the Desktop
2360 Notifications API. It requires D-Bus for communication.
2362 ** soap-client.el supports access to SOAP web services from Emacs.
2363 soap-inspect.el is an interactive inspector for SOAP WSDL structures.
2365 ** New generic mode, xmodmap-generic-mode, for xmodmap files.
2367 ** New emacs-lock.el package.
2368 The previous version has been moved to obsolete/old-emacs-lock.el.
2369 Now, there is a proper minor mode `emacs-lock-mode'. Protection
2370 against exiting Emacs and killing the buffer can be set separately.
2371 The mechanism for automatically turning off protection for buffers
2372 with dead inferior processes has been generalized.
2375 * Incompatible Lisp Changes in Emacs 24.1
2377 ** Passing a nil argument to a minor mode function call now ENABLES
2378 the minor mode unconditionally. This is so that you can write e.g.
2380 (add-hook 'text-mode-hook 'foo-mode)
2382 to enable foo-mode in Text mode buffers, removing the need for
2383 `turn-on-foo-mode' style functions. This affects all mode commands
2384 defined by `define-minor-mode'. If called interactively, the mode
2385 command still toggles the minor mode.
2387 ** The return value of `backup-buffer' has changed.
2388 It is now a list of three elements, where the second element is a list
2389 describing the original file's SELinux context. If Emacs or the
2390 system lacks SELinux support, the context list is (nil nil nil nil).
2391 See "Basic SELinux support" above, under "Changes in Emacs 24.1".
2393 ** `char-direction-table' and the `char-direction' function were deleted.
2394 They were buggy and inferior to the new support of bidirectional
2395 editing introduced in Emacs 24. If you need the bidirectional
2396 properties of a character, use `get-char-code-property' with the last
2397 argument `bidi-class'.
2399 ** `copy-directory' now copies the source directory as a subdirectory
2400 of the target directory, if the latter is an existing directory. The
2401 new optional arg COPY-CONTENTS, if non-nil, makes the function copy
2402 the contents directly into a pre-existing target directory.
2404 ** For mouse click input events in the text area, the Y pixel
2405 coordinate in the POSITION list now counts from the top of the text
2406 area, excluding any header line. Previously, it counted from the top
2409 ** Support for "old-style" backquotes, obsolete for 10+ years, has
2410 been further reduced. Now a backquote not followed by a space is
2411 always treated as a "new-style" backquote. Please remove all
2412 "old-style" backquotes from your code. If your code uses backquotes
2413 as documented in the Elisp manual, and compiles without warning, then
2414 you have nothing to do in this regard. Code not following the
2415 appropriate conventions may fail to compile.
2417 The most common cause of trouble seems to be an old-style backquote
2418 followed by a newline. Another cause of trouble is vector notation
2419 for key sequence notation: instead of [(control ,)] and [(control ')],
2420 you should write [(control ?,)] and [(control ?')], which will work in
2423 ** The macro `eval-at-startup' was removed in Emacs 23.2, but this
2424 was not advertised at the time. The function `custom-initialize-delay'
2425 replaced all known uses.
2427 ** `view-buffer' now treats special mode-class in the same way that
2428 `view-file' has since Emacs 22 (i.e. it won't enable View mode if the
2429 major mode is special).
2431 ** Menu and tool bar changes
2433 *** During startup, Emacs no longer adds entries for `menu-bar-lines'
2434 and `tool-bar-lines' to `default-frame-alist' and `initial-frame-alist'.
2435 With these alist entries omitted, `make-frame' checks the value of the
2436 variable `menu-bar-mode'/`tool-bar-mode' to determine whether to create
2437 a menu-bar or tool-bar, respectively. If the alist entries are added,
2438 they override the value of `menu-bar-mode'/`tool-bar-mode'.
2440 *** The menu bar bindings's caches are not used any more.
2441 Use (where-is-internal <def> nil t) instead.
2443 ** Regions created by mouse dragging are now normal active regions,
2444 similar to those created by shift-selection (see Selection changes
2445 above). In previous Emacs versions, these regions were delineated by
2446 `mouse-drag-overlay'; that variable has been removed.
2448 ** The fourth argument of `filter-buffer-substring' has been removed.
2449 If you want to remove text properties from the final result, simply
2450 pass the result through substring-no-properties.
2452 ** cl.el no longer provides `cl-19'.
2454 ** The following obsolete functions and aliases have been removed
2455 (the appropriate new function is given in parentheses; "not needed"
2456 means you can just remove all calls to the function in question):
2458 *** `comint-kill-output' (`comint-delete-output')
2459 *** `decompose-composite-char' (`char-to-string')
2460 *** `outline-visible' (`outline-invisible-p')
2461 *** `internal-find-face' (`facep')
2462 *** `internal-get-face' (`facep and check-face')
2463 *** `frame-update-faces' (not needed)
2464 *** `frame-update-face-colors' (`frame-set-background-mode')
2465 *** `x-frob-font-weight' and `x-frob-font-slant' (`make-face-*' functions)
2466 *** `x-make-font-bold and x-make-font-demibold (`make-face-bold')
2467 *** `x-make-font-italic' and `x-make-font-oblique' (`make-face-italic')
2468 *** `x-make-font-bold-italic' (`make-face-bold-italic')
2469 *** `x-make-font-unbold' (`make-face-unbold')
2470 *** `x-make-font-unitalic' (`make-face-unitalic')
2471 *** `mldrag-drag-mode-line' (`mouse-drag-mode-line')
2472 *** `mldrag-drag-vertical-line' (`mouse-drag-vertical-line')
2473 *** `iswitchb-default-keybindings' (`iswitchb-mode')
2474 *** `char-bytes' (== 1)
2475 *** `isearch-return-char' (`isearch-printing-char')
2476 *** `make-local-hook' (not needed)
2477 *** `set-screen-height' (`set-frame-height')
2478 *** `set-screen-width' (`set-frame-width')
2480 ** The following obsolete variables and varaliases have been removed
2481 (the appropriate new variable is given in parentheses):
2483 *** `checkdoc-minor-keymap' (`checkdoc-minor-mode-map')
2484 *** `vc-header-alist' (`vc-BACKEND-header')
2485 *** `directory-sep-char' (== ?/)
2486 *** `font-lock-defaults-alist' (`font-lock-defaults')
2487 *** `e' (`float-e').
2489 ** The following obsolete files were removed:
2490 sc.el, x-menu.el, rnews.el, rnewspost.el
2492 ** The format of the finder-inf.el file has changed, since the Finder
2493 mechanism is now based on the package system. The variable
2494 `finder-package-info' is replaced by `package--builtins' and
2495 `finder-keywords-hash'.
2497 ** When generating autoloads, `update-directory-autoloads' no longer
2498 assumes every inspected file is in your `load-path'. It instead
2499 generates relative names according to the current `load-path'.
2502 * Lisp Changes in Emacs 24.1
2504 ** Code can now use lexical scoping by default instead of dynamic scoping.
2505 The `lexical-binding' variable enables lexical scoping for local
2506 variables. It is typically set via a file-local variable in the first
2507 line of the file, in which case it applies to all the code in that
2510 *** `eval' takes a new optional argument `lexical' to choose the new lexical
2511 binding instead of the old dynamic binding mode.
2513 *** Lexically scoped interpreted functions are represented with a new form
2514 of function value which looks like (closure ENV ARGS &rest BODY).
2516 *** New macro `letrec' to define recursive local functions.
2518 *** `defvar' and `defconst' now mark the variable as special (dynamic).
2519 So do `defcustom' and other forms that call `defvar' as a subroutine.
2521 *** New function `special-variable-p' to check whether a variable is
2522 declared as dynamically bound.
2524 *** The form ((lambda ...) ...) is deprecated.
2526 ** An Emacs Lisp testing tool is now included.
2527 Emacs Lisp developers can use this tool to write automated tests for
2528 their code. See the ERT info manual for details.
2530 ** Changes for bidirectional display and editing
2532 *** New function `current-bidi-paragraph-direction'.
2533 This returns the base direction of the paragraph at point.
2535 *** New function `bidi-string-mark-left-to-right'.
2536 Given a string containing characters from right-to-left scripts, this
2537 function returns another string which can be safely inserted into a
2538 buffer, such that any following text will be always displayed to the
2539 right of that string. (This works by appending an invisible Unicode
2540 "LEFT-TO-RIGHT MARK" character if the argument string might need it.)
2542 This is useful when the buffer has overall left-to-right paragraph
2543 direction and you need to insert a string whose contents are not known
2544 in advance, without disrupting the layout of the line.
2548 *** Window tree functions are accessible in Elisp.
2549 Functions are provided to return the parent, siblings or child windows
2550 of any window including internal windows (windows not associated with a
2551 buffer) in the window tree.
2553 **** New function `window-valid-p' gives non-nil for live and internal
2556 **** Window manipulation can deal with internal windows.
2557 Many window handling functions like `split-window', `delete-window', or
2558 `delete-other-windows' as well as the window resizing functions can now
2559 act on any window including internal ones.
2561 *** window-total-height/-width vs window-body-height/-width.
2562 The function `window-height' has been renamed to `window-total-height'
2563 and `window-width' has been renamed to `window-body-width'. The old
2564 names are provided as aliases. Two new functions `window-total-width'
2565 and `window-body-height' are provided.
2567 *** Window parameters specific to window handling functions.
2568 For each window you can specify a parameter to override the default
2569 behavior of a number of functions like `split-window', `delete-window'
2570 and `delete-other-windows'. The variable `ignore-window-parameters'
2571 allows to ignore processing such parameters.
2573 *** New semantics of third argument of `split-window'.
2574 The third argument of `split-window' has been renamed to SIDE and can be
2575 set to any of the values 'below, 'right, 'above, or 'left to make the
2576 new window appear on the corresponding side of the window that shall be
2577 split. Any other value of SIDE will cause `split-window' to split the
2578 window into two side-by-side windows as before.
2580 *** Window resizing functions.
2581 A new standard function for resizing windows called `window-resize' has
2582 been introduced. This and all other functions for resizing windows no
2583 longer delete any windows when they become too small.
2585 *** Deleting the selected window now selects the most recently selected
2586 live window on that frame instead.
2588 *** `adjust-window-trailing-edge' adjustments.
2589 `adjust-window-trailing-edge' can now deal with fixed-size windows and
2590 is able to resize other windows if a window adjacent to the trailing
2591 edge cannot be shrunk any more. This makes its behavior more similar to
2592 that of Emacs 21 without compromising, however, its inability to delete
2593 windows which was introduced in Emacs 22.
2595 *** Window-local buffer lists.
2596 Windows now have local buffer lists. This means that removing a buffer
2597 from display in a window will preferably show the buffer previously
2598 shown in that window with its previous window-start and window-point
2599 positions. This also means that the same buffer may be automatically
2600 shown twice even if it already appears in another window.
2602 *** `switch-to-buffer' has a new optional argument FORCE-SAME-WINDOW,
2603 which if non-nil requires the buffer to be displayed in the currently
2604 selected window, signaling an error otherwise. If nil, another window
2605 can be used, e.g. if the selected one is strongly dedicated.
2607 *** `split-window-vertically' and `split-window-horizontally' renamed
2608 to `split-window-below' and `split-window-right' respectively.
2609 The old names are kept as aliases.
2613 **** The second arg to `display-buffer' and `pop-to-buffer' is now
2614 named ACTION, and takes a display action of the same form as
2615 `display-buffer-base-action' (see Changes, above). A non-nil,
2616 non-list value is treated specially, as the old meaning.
2618 **** New variable `display-buffer-overriding-action'.
2620 **** The procedure of `display-buffer' etc. to choose a window is
2621 determined by combining `display-buffer-overriding-action',
2622 `display-buffer-alist', the ACTION arg, `display-buffer-base-action',
2623 and `display-buffer-fallback-action'. The second and fourth of these
2624 are user-customizable variables.
2626 See the docstring of `display-buffer' for details.
2628 *** New functions `window-state-get' and `window-state-put'.
2629 These functions allow to save and restore the state of an arbitrary
2630 frame or window as an Elisp object.
2634 *** New variable `completion-extra-properties' used to specify extra
2635 properties of the current completion:
2636 - :annotate-function, same as the old completion-annotate-function.
2637 - :exit-function, function to call after completion took place.
2639 *** Functions on `completion-at-point-functions' can return any of the
2640 properties valid for `completion-extra-properties'.
2642 *** `completion-annotate-function' is obsolete.
2644 *** New `metadata' method for completion tables. The metadata thus returned
2645 can specify various details of the data returned by `all-completions':
2646 - `category' is the kind of objects returned (e.g., `buffer', `file', ...),
2647 used to select a style in completion-category-overrides.
2648 - `annotation-function' to add annotations in *Completions*.
2649 - `display-sort-function' to specify how to sort entries in *Completions*.
2650 - `cycle-sort-function' to specify how to sort entries when cycling.
2652 *** `minibuffer-local-filename-must-match-map' is not used any more.
2653 Instead, the bindings in `minibuffer-local-filename-completion-map'
2654 are combined with `minibuffer-local-must-match-map'.
2656 *** New variable `completing-read-function' allows overriding the
2657 behavior of `completing-read'.
2659 ** `glyphless-char-display' can now distinguish between graphical and
2660 text terminal display, via a char-table entry that is a cons cell.
2662 ** `pre-command-hook'/`post-command-hook' are not reset to nil on error.
2663 Instead, the offending function is removed.
2667 *** New function `run-hook-wrapped' for running an abnormal hook by
2668 passing the hook functions as arguments to a "wrapping" function.
2669 Like `run-hook-with-args-until-success', it stops at the first
2670 non-nil return value.
2672 *** New macro `with-wrapper-hook' for running an abnormal hook as a
2673 set of "wrapping" filters, similar to around advice.
2674 (A version of this macro was actually added in Emacs 23.2 but was not
2675 advertised at the time.)
2679 *** New macro `condition-case-unless-debug' (this was actually added in
2680 Emacs 23.1 as condition-case-no-debug, but not advertised)
2682 *** The macro `with-demoted-errors' was added in Emacs 23.1, but not advertised.
2684 *** Variable `stack-trace-on-error' removed.
2686 *** The debugger can now "continue" from an error, which means it will
2687 jump to the error handler as if the debugger had not been invoked
2688 instead of jumping all the way to the top-level.
2690 *** Set `debug-on-event' to enter the debugger on events like SIGUSR1.
2691 This can be useful when `inhibit-quit' is set.
2693 ** The new function `server-eval-at' allows evaluation of Lisp forms on
2694 named Emacs server instances.
2696 ** `call-process' and `call-process-region' allow a `(:file "file")' spec
2697 to redirect STDOUT to a file.
2699 ** The function `format-time-string' now supports the %N directive,
2700 for higher-resolution time stamps.
2702 ** New input reading functions
2704 *** New function `read-char-choice' reads a restricted set of
2705 characters, discarding any inputs not inside the set.
2707 *** The command `read-color' now requires a match for a color name
2708 or RGB triplet, instead of signaling an error if the user provides
2711 **** `facemenu-read-color' is now an alias for `read-color'.
2713 ** `image-library-alist' is renamed to `dynamic-library-alist'.
2714 The variable is now used to load all kind of supported dynamic libraries,
2715 not just image libraries. The previous name is still available as an
2718 ** Syntax parsing changes
2720 *** New variable `syntax-propertize-function'.
2721 This replaces `font-lock-syntactic-keywords' which is now obsolete.
2722 This allows syntax-table properties to be set independently from font-lock:
2723 just call syntax-propertize to make sure the text is propertized.
2724 Together with this new variable come a new hook
2725 syntax-propertize-extend-region-functions, as well as two helper functions:
2726 syntax-propertize-via-font-lock to reuse old font-lock-syntactic-keywords
2727 as-is; and syntax-propertize-rules which provides a new way to specify
2730 *** Syntax tables support a new "comment style c" additionally to style b.
2732 ** New hook `post-self-insert-hook', run after `self-insert-command'.
2734 ** frame-local variables cannot be let-bound any more.
2736 ** Major and minor mode changes
2738 *** `set-auto-mode' now respects mode: local variables at the end of files,
2739 as well as those in the -*- line.
2741 *** `prog-mode' is a new major mode from which programming modes
2744 **** `prog-mode-hook' can be used to enable features for programming
2745 modes, e.g. (add-hook 'prog-mode-hook 'flyspell-prog-mode) to enable
2746 on-the-fly spell checking for comments and strings.
2748 *** New hook `change-major-mode-after-body-hook', run by
2749 `run-mode-hooks' just before any other mode hooks.
2751 *** Enabled globalized minor modes can be disabled in specific major modes.
2752 If the global mode is global-FOO-mode, then run (FOO-mode -1) in the
2753 major mode's hook, where FOO-mode toggles the mode on a per-buffer basis.
2755 *** `define-minor-mode' accepts new keywords :variable, :after-hook.
2757 ** File-handling changes
2759 *** `delete-file' and `delete-directory' now accept optional arg TRASH.
2760 Trashing is performed if TRASH and `delete-by-moving-to-trash' are
2761 both non-nil. Interactively, TRASH defaults to t, unless a prefix
2762 argument is supplied (see Trash changes, above).
2764 *** New file predicates: `file-equal-p', `file-in-directory-p'.
2766 ** Tool-bars can display separators.
2767 Tool-bar separators are handled like menu separators in menu-bar maps,
2768 i.e. via menu entries of the form `(menu-item "--")'.
2772 *** Animated images support (currently animated gifs only).
2774 **** `image-animated-p' returns non-nil if an image can be animated.
2776 **** `image-animate' animates a supplied image spec.
2778 **** `image-animate-timer' returns the timer object for an image that
2781 *** `image-extension-data' has been renamed to `image-metadata'.
2782 The old name is an obsolete alias to the new one.
2784 *** Image mode can view any image type that ImageMagick supports.
2785 This requires Emacs to be built with ImageMagick support.
2787 **** New function `imagemagick-types', defined if ImageMagick support
2788 is enabled, returns a list of image file extensions that your
2789 ImageMagick installation supports.
2791 **** New function `imagemagick-register-types' enables ImageMagick
2792 image types in Image mode and in `create-image' and other helper
2795 **** New option `imagemagick-types-inhibit' excludes certain
2796 ImageMagick image types from `imagemagick-register-types'.
2798 **** With ImageMagick support, there are extra Image mode commands to
2799 resize and rotate images: `image-transform-fit-to-height',
2800 `image-transform-fit-to-width', `image-transform-set-rotation', and
2801 `image-transform-set-scale'.
2803 ** `compose-mail' now accepts an optional 8th arg, RETURN-ACTION, and
2804 passes it to the mail user agent function. This argument specifies an
2805 action for returning to the caller after finishing with the mail. For
2806 example, this is used by Rmail to optionally delete a mail window.
2808 ** XML and HTML parsing
2809 If Emacs is compiled with libxml2 support, there are two new
2810 functions: `libxml-parse-html-region' (which parses "real world" HTML)
2811 and `libxml-parse-xml-region' (which parses XML). Both return an
2812 Emacs Lisp parse tree.
2814 ** Networking and encryption changes
2816 *** `open-network-stream' can now be used to open an encrypted stream.
2817 It now accepts an optional `:type' parameter for initiating a TLS
2818 connection, directly or via STARTTLS. To do STARTTLS, additional
2819 parameters (`:end-of-command', `:success', `:capabilities-command')
2820 must also be supplied.
2822 *** New library gnutls.el.
2823 The new function `gnutls-available-p' returns non-nil if Emacs is
2824 built with GnuTLS support. The main entry points are
2825 `open-gnutls-stream' and `gnutls-negotiate'. It's easiest to use
2826 these functions through `open-network-stream', because that can
2827 upgrade connections through STARTTLS opportunistically or use plain
2828 SSL, depending on your needs. For debugging, set `gnutls-log-level'
2831 *** New primitive `secure-hash' that supports many secure hash algorithms:
2832 md5, sha1, sha2, sha224, sha256, sha384, and sha512. The lisp library
2833 sha1.el has been removed. The `sha1' feature is provided by default.
2837 *** New hook `isearch-update-post-hook' that runs in `isearch-update'.
2839 ** Progress reporters can now "spin".
2840 The MIN-VALUE and MAX-VALUE arguments of `make-progress-reporter' can
2841 now be nil, or omitted. This makes a "non-numeric" reporter. Each
2842 time you call `progress-reporter-update' on that progress reporter,
2843 with a nil or omitted VALUE argument, the reporter message is
2844 displayed with a "spinning bar".
2846 ** New variable `revert-buffer-in-progress-p' is true while a buffer is
2847 being reverted, even if the buffer has a local `revert-buffer-function'.
2849 ** New variables `delayed-warnings-list' and `delayed-warnings-hook'.
2850 If delayed-warnings-list is non-nil, the command loop calls
2851 `delayed-warnings-hook' after `post-command-hook'. At present, this
2852 is only used by Emacs on some platforms to display warnings during
2853 startup, which might otherwise not be noticed. This uses the
2854 functions `display-delayed-warnings' and `collapse-delayed-warnings'.
2856 ** rx.el has a new `group-n' construct for explicitly numbered groups.
2858 ** New function `make-composed-keymap' that constructs a new keymap
2859 from multiple input maps. You can use this to make a keymap that
2860 inherits from multiple maps, eg:
2861 (set-keymap-parent newmap (make-composed-keymap othermap parent))
2863 ** New function `string-prefix-p'.
2864 (This was actually added in Emacs 23.2 but was not advertised at the time.)
2866 ** New reader macro ## that stands for the empty symbol.
2867 This means that the empty symbol can now be read back. Also, #: by itself
2868 (when not immediately followed by a possible symbol character) stands for
2869 an empty uninterned symbol.
2871 ** New math functions `isnan', `copysign', `frexp', `ldexp'.
2873 ** The following functions and variables are obsolete:
2875 *** `tooltip-use-echo-area' is obsolete.
2876 Rather than setting this to t, disable Tooltip mode instead.
2878 *** buffer-substring-filters is obsolete.
2879 Use `filter-buffer-substring-functions' instead.
2881 *** `byte-compile-disable-print-circle' is obsolete.
2883 *** `deferred-action-list' and `deferred-action-function' are obsolete.
2884 Use `post-command-hook' instead.
2886 *** `font-lock-maximum-size' is obsolete.
2889 * Changes in Emacs 24.1 on Non-Free Operating Systems
2891 ** On MS Windows, Emacs warns when using the obsolete init file _emacs,
2892 and also when HOME is set to C:\ by default.
2894 ** New configure.bat options
2896 *** --enable-checking builds Emacs with extra runtime checks.
2898 *** --distfiles specifies files to be included in binary distribution.
2900 *** --without-gnutls disables automatic GnuTLS detection.
2902 *** --lib for general library linkage, works with the USER_LIBS build variable.
2904 ** New make target `dist' to create binary distribution for MS Windows.
2906 ** The Lisp function `w32-default-color-map' is now obsolete.
2907 (It is only used internally in the Emacs C code.)
2909 ** Customize ns-auto-hide-menu-bar to have the menu-bar hidden, but
2910 reappear on mouse-over. (Requires OS X 10.6 or later.)
2912 ** On Mac OS X, dragging a file into Emacs visits the file, like on
2913 other platforms, rather than inserting its contents into the buffer.
2916 ----------------------------------------------------------------------
2917 This file is part of GNU Emacs.
2919 GNU Emacs is free software: you can redistribute it and/or modify
2920 it under the terms of the GNU General Public License as published by
2921 the Free Software Foundation, either version 3 of the License, or
2922 (at your option) any later version.
2924 GNU Emacs is distributed in the hope that it will be useful,
2925 but WITHOUT ANY WARRANTY; without even the implied warranty of
2926 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2927 GNU General Public License for more details.
2929 You should have received a copy of the GNU General Public License
2930 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2935 paragraph-separate: "[
\f]*$"