1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2014-2016 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 25.
11 See file HISTORY for a list of GNU Emacs versions and release dates.
12 See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
13 and NEWS.1-17 for changes in older Emacs versions.
15 You can narrow news to a specific version by calling 'view-emacs-news'
16 with a prefix argument or by typing C-u C-h C-n.
19 +++ indicates that all necessary documentation updates are complete.
20 (This means all relevant manuals in doc/ AND lisp doc-strings.)
21 --- means no change in the manuals is needed.
22 When you add a new item, use the appropriate mark if you are sure it applies,
23 otherwise leave it unmarked.
26 * Installation Changes in Emacs 25.2
29 ** New configure option '--disable-build-details' attempts to build an
30 Emacs that is more likely to be reproducible; that is, if you build
31 and install Emacs twice, the second Emacs is a copy of the first.
32 Deterministic builds omit the build date from the output of the
33 emacs-version and erc-cmd-SV functions, and the leave the following
34 variables nil: emacs-build-system, emacs-build-time,
37 ** Emacs no longer works on IRIX. We expect that Emacs users are not
38 affected by this, as SGI stopped supporting IRIX in December 2013.
41 * Startup Changes in Emacs 25.2
44 * Changes in Emacs 25.2
47 ** A number of accessors for the value returned by 'file-attributes'
48 has been added. They are: 'file-attribute-type',
49 'file-attribute-link-number', 'file-attribute-user-id',
50 'file-attribute-group-id', 'file-attribute-access-time',
51 'file-attribute-modification-time',
52 'file-attribute-status-change-time', 'file-attribute-size',
53 'file-attribute-modes', 'file-attribute-inode-number', and
54 'file-attribute-device-number'
57 ** The locale language name 'ca' is now mapped to the language
58 environment 'Catalan', which has been added.
61 ** 'align-regexp' has a separate history for its interactive argument
62 'align-regexp' no longer shares its history with all other
63 history-less functions that use 'read-string'
66 ** The networking code has been reworked so that it's more
67 asynchronous than it was (when specifying :nowait t in
68 'make-network-process'). How asynchronous it is varies based on the
69 capabilities of the system, but on a typical GNU/Linux system the DNS
70 resolution, the connection, and (for TLS streams) the TLS negotiation
71 are all done without blocking the main Emacs thread. To get
72 asynchronous TLS, the TLS boot parameters have to be passed in (see
73 the manual for details).
75 Certain process oriented functions (like 'process-datagram-address')
76 will block until socket setup has been performed. The recommended way
77 to deal with asynchronous sockets is to avoid interacting with them
78 until they have changed status to "run". This is most easily done
79 from a process sentinel.
81 ** 'make-network-process' and 'open-network-stream' sometimes allowed
82 :service to be an integer string (e.g., :service "993") and sometimes
83 required an integer (e.g., :service 993). This difference has been
84 eliminated, and integer strings work everywhere.
86 ** It is possible to disable attempted recovery on fatal signals
88 Two new variables allow to disable attempts to recover from stack
89 overflow and to avoid automatic auto-save when Emacs is delivered a
90 fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
91 will disable attempts to recover from C stack overflows; Emacs will
92 then crash as with any other fatal signal.
93 'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
94 disable attempts to auto-save the session and shut down in an orderly
95 fashion when Emacs receives a fatal signal; instead, Emacs will
96 terminate immediately. Both variables are non-'nil' by default.
97 These variables are for users who would like to avoid the small
98 probability of data corruption due to techniques Emacs uses to recover
102 * Editing Changes in Emacs 25.2
105 * Changes in Specialized Modes and Packages in Emacs 25.2
110 *** A new 's' command for switching to another eww buffer via the minibuffer.
113 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
114 with the 'o' command from 'image-map'.
117 ** The commands that add ChangeLog entries now prefer a VCS root directory
118 for the ChangeLog file, if none already exists. Customize
119 'change-log-directory-files' to nil for the old behavior.
122 ** Support for non-string values of 'time-stamp-format' has been removed.
127 *** New connection method "sg", which allows to edit files under
131 *** New connection method "doas" for OpenBSD hosts.
134 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
139 *** Support for completing attribute values using the 'completion-at-point'
143 * New Modes and Packages in Emacs 25.2
146 * Incompatible Lisp Changes in Emacs 25.2
149 ** Resizing a frame no longer runs 'window-configuration-change-hook'.
150 Put your function on 'window-size-change-functions' instead.
153 * Lisp Changes in Emacs 25.2
155 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
157 ** Autoload files can be generated without timestamps,
158 by setting 'autoload-timestamps' to nil.
159 FIXME As an experiment, nil is the current default.
160 If no insurmountable problems before next release, it can stay that way.
162 ** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
166 ** 'gnutls-boot' now takes a parameter :complete-negotiation that says
167 that negotiation should complete even on non-blocking sockets.
170 ** New functions 'window-pixel-width-before-size-change' and
171 'window-pixel-height-before-size-change' allow to detect which window
172 changed size when 'window-size-change-functions' are run.
175 ** New function 'display-buffer-reuse-mode-window' is an action function
176 suitable for use in 'display-buffer-alist'. For example, to avoid creating
177 a new window when opening man pages when there's already one, use
178 (add-to-list 'display-buffer-alist
179 '("\\`\\*Man .*\\*\\'" .
180 (display-buffer-reuse-mode-window
181 (inhibit-same-window . nil)
185 ** New function 'func-arity' returns information about the argument list
186 of an arbitrary function.
187 This is a generalization of 'subr-arity' for functions that are not
188 built-in primitives. We recommend using this new function instead of
192 ** 'parse-partial-sexp' state has a new element. Element 10 is
193 non-nil when the last character scanned might be the first character
194 of a two character construct, i.e. a comment delimiter or escaped
195 character. Its value is the syntax of that last character.
198 ** 'parse-partial-sexp''s state, element 9, has now been confirmed as
199 permanent and documented, and may be used by Lisp programs. Its value
200 is a list of currently open parenthesis positions, starting with the
201 outermost parenthesis.
204 * Changes in Emacs 25.2 on Non-Free Operating Systems
206 ** Intercepting hotkeys on Windows 7 and later now works better.
207 The new keyboard hooking code properly grabs system hotkeys such as
208 Win-* and Alt-TAB, in a way that Emacs can get at them before the
209 system. This makes the 'w32-register-hot-key' functionality work
210 again on all versions of MS-Windows starting with Windows 7. On
211 Windows NT and later you can now register any hotkey combination. (On
212 Windows 9X, the previous limitations, spelled out in the Emacs manual,
216 * Installation Changes in Emacs 25.1
219 ** Building Emacs now requires C99 or later.
222 ** Building Emacs now requires GNU make, version 3.81 or later.
225 ** New configure option --with-cairo.
226 This builds Emacs with Cairo drawing. As a side effect, it provides
227 support for built-in printing, when Emacs was built with GTK+.
228 Cairo drawing is an experimental feature in Emacs, and subject to
229 change in future releases.
232 ** New configure option --with-modules.
233 This enables support for loading dynamic modules; see below.
236 ** By default, Emacs no longer works on IRIX. We expect that Emacs
237 users are not affected by this, as SGI stopped supporting IRIX in
238 December 2013. If you are affected, please send a bug report. You
239 should be able to work around the problem either by porting the Emacs
240 undumping code to GCC under IRIX, or by configuring --with-wide-int,
241 or by sticking with Emacs 24.4.
244 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
245 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
246 since Emacs 24.4, and the other variants were undocumented and were
247 obstacles to maintenance and development. GC_MARK_STACK and its
248 related symbols have been removed from the C internals.
251 ** 'configure' now prefers gnustep-config when configuring GNUstep.
252 If gnustep-config is not available, the old heuristics are used.
255 ** 'configure' now prefers inotify to gfile for file notification,
256 unless gfile is explicitly requested via --with-file-notification='gfile'.
259 ** 'configure' detects the kqueue file notification library on *BSD
260 and Mac OS X machines.
263 ** The configure option '--with-pkg-config-prog' has been removed.
264 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
267 ** The configure option '--with-mmdf' has been removed.
268 It was no longer useful, as it relied on libraries that are no longer
269 supported, and its presence led to confusion during configuration.
270 This affects only the 'movemail' utility; Emacs itself can still
271 process MMDF-format files as before.
274 ** The configure option '--enable-silent-rules' is now the default,
275 and silent rules are now quieter. To get the old behavior where
276 'make' chatters a lot, configure with '--disable-silent-rules' or
277 build with 'make V=1'.
280 ** The configure option '--with-gameuser' now allows you to specify a
281 group instead of a user if its argument is prefixed by ':' (a colon).
282 This will cause the game score files in ${localstatedir}/games/emacs
283 to be owned by that group, and the helper program for updating them to
284 be installed setgid. The option now defaults to the 'games' group.
287 ** The 'grep-changelog' script (and its manual page) are no longer included.
288 It has no particular connection to Emacs and has not changed in years,
289 so if you want to use it, you can always take a copy from an older Emacs.
292 ** Emacs 25 comes with a new set of icons.
293 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
294 The old Emacs logo icons are available as 'emacs23.png' in the same location.
297 ** New make target 'check-expensive' to run additional tests.
298 This includes all tests which run via "make check", plus additional
299 tests which take more time to perform.
302 * Startup Changes in Emacs 25.1
305 ** When Emacs is given a file as a command line argument and
306 'initial-buffer-choice' is non-nil, display both the file and
307 'initial-buffer-choice'. When Emacs is given more than one file and
308 'initial-buffer-choice' is non-nil, show 'initial-buffer-choice'
309 and *Buffer List*. This makes Emacs convenient to use from the
310 command line when 'initial-buffer-choice' is non-nil.
313 ** The value of 'initial-scratch-message' is now treated as a doc string
314 and can contain escape sequences for command keys, quotes, and the like.
317 * Changes in Emacs 25.1
320 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
321 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
322 xwidget support, you can access the embedded webkit browser with 'M-x
323 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
324 browser. The buffer will have a new mode, 'xwidget-webkit-mode'
325 (similar to 'image-mode'), which supports the webkit widget.
328 *** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
329 'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
330 'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
331 'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
332 'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
333 'xwidget-webkit-scroll-up'.
336 ** Emacs can now load shared/dynamic libraries (modules).
337 A dynamic Emacs module is a shared library that provides additional
338 functionality for use in Emacs Lisp programs, just like a package
339 written in Emacs Lisp would. The functions 'load', 'require',
340 'load-file', etc. were extended to load such modules, as they do with
341 Emacs Lisp packages. The new variable 'module-file-suffix' holds the
342 system-dependent value of the file-name extension ('.so' on Posix
343 hosts) of the module files.
345 A module should export a C-callable function named
346 'emacs_module_init', which Emacs will call as part of the call to
347 'load' or 'require' which loads the module. It should also export a
348 symbol named 'plugin_is_GPL_compatible' to indicate that its code is
349 released under the GPL or compatible license; Emacs will refuse to
350 load modules that don't export such a symbol.
352 If a module needs to call Emacs functions, it should do so through the
353 API defined and documented in the header file 'emacs-module.h'. Note
354 that any module that provides Lisp-callable functions will have to use
355 Emacs functions such as 'fset' and 'funcall', in order to register its
356 functions with the Emacs Lisp interpreter.
358 Modules can create 'user-ptr' Lisp objects that embed pointers to C
359 structs defined by the module. This is useful for keeping around
360 complex data structures created by a module, to be passed back to the
361 module's functions. User-ptr objects can also have associated
362 "finalizers" -- functions to be run when the object is GC'ed; this is
363 useful for freeing any resources allocated for the underlying data
364 structure, such as memory, open file descriptors, etc. A new
365 predicate 'user-ptrp' returns non-nil if its argument is a 'user-ptr'
368 Loadable modules in Emacs are an experimental feature, and subject to
369 change in future releases. For that reason, their support is disabled
370 by default, and must be enabled by using the '--with-modules' option
374 ** A second dir-local file (.dir-locals-2.el) is now accepted.
375 See the variable 'dir-locals-file-2' for more information.
378 ** Network security (TLS/SSL certificate validity and the like) is
379 added via the new Network Security Manager (NSM) and controlled via
380 the 'network-security-level' variable.
383 ** International domain names (IDNA) are now encoded via the new
384 puny.el library, so that one can visit web sites with non-ASCII URLs.
387 ** C-h l now also lists the commands that were run.
389 ** The new M-s M-w key binding uses eww to search the web for the
393 ** The new 'timer-list' command lists all active timers in a buffer
394 where you can cancel them with the 'c' command.
396 ** M-x suggests shorthands and ignores obsolete commands for completion.
397 ** x-select-enable-clipboard is renamed select-enable-clipboard.
398 x-select-enable-primary and renamed select-enable-primary.
399 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
400 name it), with the proviso that on some systems (e.g. Windows)
401 select-enable-primary is ineffective since the system doesn't
402 have the equivalent of a primary selection.
405 ** New option 'switch-to-buffer-in-dedicated-window' allows you to
406 customize how 'switch-to-buffer' proceeds interactively when the
407 selected window is strongly dedicated to its buffer.
410 ** The option 'even-window-heights' has been renamed to
411 'even-window-sizes' and now handles window widths as well.
414 ** New function 'read-multiple-choice' use to prompt for
415 multiple-choice questions, with a handy way to display help texts.
418 ** terpri gets an optional arg ENSURE to conditionally output a newline.
421 ** 'insert-register' now leaves point after the inserted text
422 when called interactively. A prefix argument toggles this behavior.
425 ** The new variable 'term-file-aliases' replaces some files from lisp/term.
426 The function 'tty-run-terminal-initialization' consults this variable
427 when deciding what terminal-specific initialization code to run.
430 ** New variable 'system-configuration-features', listing some of the
431 main features that Emacs was compiled with. This is mainly intended
432 for use in Emacs bug reports.
435 ** A password is now hidden also when typed in batch mode. Another
436 hiding character but the default '.' can be used by let-binding the
437 variable 'read-hide-char'.
440 ** The Emacs pseudo-random number generator can be securely seeded.
441 On system where Emacs can access the system entropy or some other
442 cryptographically secure random stream, it now uses that when 'random'
443 is called with its argument 't'. This allows cryptographically strong
444 random values; in particular, the Emacs server now uses this facility
445 to produce its authentication key.
448 ** New input methods: 'tamil-dvorak' and 'programmer-dvorak'.
451 * Editing Changes in Emacs 25.1
454 ** M-x suggests shorthands and ignores obsolete commands for completion.
459 *** Successive single-char deletions are collapsed in the undo-log just like
460 successive char insertions. Which commands invoke this behavior is
461 controlled by the new 'undo-auto-amalgamate' function. See the node
462 "Undo" in the ELisp manual for more details.
465 *** The heuristic used to insert 'undo-boundary' after each command
466 has changed, so that if a command causes changes in more than just the
467 current buffer, Emacs now calls 'undo-boundary' in every buffer
468 affected by the command.
471 ** New command 'comment-line' bound to 'C-x C-;'.
473 ** New and improved facilities for inserting Unicode characters
476 *** Unicode names entered via C-x 8 RET now use substring completion by default.
479 *** C-x 8 now has shorthands for several chars, such as U+2010
480 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH). As
481 before, you can type C-x 8 C-h to list shorthands.
484 *** New minor mode electric-quote-mode for using curved quotes as you
485 type. See also the new variable 'text-quoting-style'.
488 ** New minor mode global-eldoc-mode is enabled by default.
491 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
492 Bracketed paste mode causes text terminals to wrap pasted text in special
493 escape sequences that allow Emacs to tell the difference between text
494 you type and text you paste from other applications. Emacs then
495 avoids interpreting each character in the pasted text as it does with
496 keyboard input, which results in a paste experience similar to that
497 under a window system, and significant performance improvements when
498 pasting large amounts of text.
500 Bracketed paste mode is disabled by default, so Emacs automatically
501 enables it at startup if the terminal supports it.
504 ** Emacs now supports the latest version of the UBA.
505 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
506 was updated to support all the latest additions and changes introduced
507 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
508 This includes full support for directional isolates and the
509 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
513 ** You can access 'mouse-buffer-menu' (C-down-mouse-1) using C-f10.
516 ** New buffer-local 'electric-pair-local-mode'.
519 ** New variable 'fast-but-imprecise-scrolling' inhibits
520 fontification during full screen scrolling operations, giving less
521 hesitant operation during auto-repeat of C-v, M-v at the cost of
522 possible inaccuracies in the end position.
525 ** New documentation command 'describe-symbol'.
526 Works for functions, variables, faces, etc. It is bound to 'C-h o' by
530 ** New function 'custom-prompt-customize-unsaved-options' checks for
531 unsaved customizations and prompts user to customize (if found). It
532 is intended for adding to 'kill-emacs-query-functions'.
535 ** The old 'C-x w' bindings in hi-lock-mode are officially deprecated
536 in favor of the global 'M-s h' bindings introduced in Emacs-23.1.
537 They'll disappear soon.
540 ** New bindings for 'query-replace-map'.
541 'undo', undo the last replacement; bound to 'u'.
542 'undo-all', undo all replacements; bound to 'U'.
545 * Changes in Specialized Modes and Packages in Emacs 25.1
550 *** New command 'checkdoc-package-keywords' checks if the
551 current package keywords are recognized. Set the new option
552 'checkdoc-package-keywords-flag' to non-nil to make
553 'checkdoc-current-buffer' call this function automatically.
556 *** New function 'checkdoc-file' checks for style errors.
557 It's meant for use together with 'compile':
558 emacs -batch --eval "(checkdoc-file \"subr.el\")"
563 *** The desktop format version has been upgraded from 206 to 208.
564 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
565 cannot read a version 208 desktop. To upgrade your desktop file, you
566 must explicitly request the upgrade, by C-u M-x desktop-save. You are
567 recommended to do this as soon as you have firmly upgraded to Emacs
568 25.1 (or later). Should you ever need to downgrade your desktop file
569 to version 206, you can do this with C-u C-u M-x desktop-save.
572 ** New function 'bookmark-set-no-overwrite' bound to C-x r M.
573 It raises an error if a bookmark of that name already exists,
574 unlike 'bookmark-set' which silently updates an existing bookmark.
579 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
580 now control how mm-* functions fetch and display images in an HTML
581 message. Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
582 for that purpose, i.e., binds mm-html- variables with those gnus-
583 variables, but other packages do not have to bind gnus- variables now.
586 *** 'mm-inline-text-html-with-images' has been removed.
587 Use 'mm-html-inhibit-images' instead. Note that the value is opposite
593 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
594 GnuTLS encryption functions if possible.
599 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
600 the ordering of object keys by default.
603 *** New commands 'json-pretty-print-ordered' and
604 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
605 object keys sorted alphabetically.
608 ** Prog mode has some support for multi-mode indentation.
609 This allows better indentation support in modes that support multiple
610 programming languages in the same buffer, like literate programming
611 environments or ANTLR programs with embedded Python code.
613 A major mode can provide indentation context for a sub-mode through
614 the 'prog-indentation-context' variable. To support this, modes that
615 provide indentation should use 'prog-widen' instead of 'widen' and
616 'prog-first-column' instead of a literal zero. See the node
617 "Mode-Specific Indent" in the ELisp manual for more details.
619 ** Prettify Symbols mode
622 *** Prettify Symbols mode supports custom composition predicates. By
623 overriding the default 'prettify-symbols-compose-predicate', modes can
624 specify in which contexts a symbol may be displayed as some Unicode
625 character. 'prettify-symbols-default-compose-p' is the default which
626 is suitable for most programming languages such as C or Lisp (but not
630 *** Symbols can be unprettified while point is inside them.
631 New variable 'prettify-symbols-unprettify-at-point' configures this.
633 ** Enhanced xterm support
636 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
637 This variable tells Emacs which advanced capabilities are available in
638 the xterm terminal emulator used to display Emacs text-mode frames.
639 The default is to check each capability, and use it if available.
640 (This variable was introduced in Emacs 24.1, but was not announced in
644 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
645 in the surrounding GUI (using the OSC-52 escape sequence). This only works
646 if your xterm supports it and enables the 'allowWindowOps' options (disabled
647 by default at least in Debian, for security reasons).
649 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
650 escape sequence) if your xterm has the feature enabled but for that you
651 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
654 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
657 ** The way to turn on and off 'save-place' mode has changed.
658 It is no longer sufficient to load the saveplace library and set
659 'save-place' non-nil. Instead, use the two new minor modes:
660 'save-place-mode' turns on saving last place in every file, and
661 'save-place-local-mode' does that only for the file in whose buffer it
662 is invoked. The 'save-place' variable is now an obsolete alias for
663 'save-place-mode', which replaces it, and 'toggle-save-place' is an
664 obsolete alias for the new 'save-place-local-mode' command.
669 *** ERC can now hide message types by network or channel.
670 'erc-hide-list' will hide all messages of the specified type, while
671 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
672 specified message types for the respective specified targets.
674 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
678 *** Reconnection is now asynchronous.
681 *** Nick completion is now case-insensitive again after inadvertently
682 being made case-sensitive in Emacs 24.2.
687 *** New commands, key binds, and menu items.
689 **** '<' and '>' for navigating previous and next tracks in playlist
691 **** New play/pause command 'mpc-toggle-play' bound to 's'
693 **** 'g' bound to new command 'mpc-seek-current' will navigate current
696 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
697 toggling playback modes.
700 *** Now supports connecting to a UNIX domain socket.
703 *** Looks at more image file names to use as album art.
704 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
705 (XP) in addition to cover.jpg.
708 *** Searches in more locations for MPD configuration files.
709 MPD supports the XDG base directory specification since version 0.17.6.
714 *** 'midnight-mode' is now a proper minor mode.
717 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
722 *** New "external" package status.
723 An external package is any installed package that's not built-in and
724 not from 'package-user-dir', which usually means it's from an entry in
725 'package-directory-list'. They are treated much like built-in
726 packages, in that they cannot be deleted through the package menu and
727 are not considered for upgrades.
729 The effect is that a user can manually place a specific version of a
730 package inside 'package-directory-list' and the package menu will
734 *** If a package is available on multiple archives and one has higher
735 priority (as per 'package-archive-priorities') only that one is
736 listed. This can be configured with 'package-menu-hide-low-priority'.
739 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
740 This includes the above-mentioned low-priority packages, as well as
741 available packages whose version is lower than the currently installed
742 version (which were previously impossible to display).
743 This allows users to downgrade a package if a lower version is
747 *** When filtering the package menu, keywords starting with "arc:" or
748 "status:" represent package archive or status, respectively, instead
752 *** Most functions which involve downloading information now take an
753 ASYNC argument. If it is non-nil, package.el performs the download(s)
757 *** New variable 'package-menu-async' controls whether the
758 package-menu uses asynchronous downloads.
761 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
762 This follows the same rules as installing from a .tar file, except the
763 -pkg file is optional.
766 *** Packages which are dependencies of other packages cannot be deleted.
767 The FORCE argument to 'package-delete' overrides this.
770 *** New custom variable 'package-selected-packages' tracks packages
771 which were installed by the user (as opposed to installed as
772 dependencies). This variable can also be manually customized.
775 *** New command 'package-install-selected-packages' installs all
776 packages from 'package-selected-packages' which are currently missing.
779 *** 'package-install' function now takes a DONT-SELECT argument. If
780 this function is called interactively or if DONT-SELECT is nil, add the
781 package being installed to 'package-selected-packages'.
784 *** New command 'package-autoremove' removes all packages which were
785 installed strictly as dependencies but are no longer needed.
790 When you invoke 'shell' interactively, the *shell* buffer will now
791 display in a new window. However, you can customize this behavior via
792 the 'display-buffer-alist' variable. For example, to get
793 the old behavior -- *shell* buffer displays in current window -- use
794 (add-to-list 'display-buffer-alist
795 '("^\\*shell\\*$" . (display-buffer-same-window))).
799 *** The ':protection' slot option is not obeyed any more.
801 *** The 'newname' argument to constructors is optional&deprecated.
802 If you need your objects to be named, do it by inheriting from 'eieio-named'.
804 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
806 *** The <class> variables are declared obsolete.
808 *** The <initarg> variables are declared obsolete.
810 *** defgeneric and defmethod are declared obsolete.
811 Use the equivalent facilities from cl-generic.el instead.
813 *** 'constructor' is now an obsolete alias for 'make-instance'.
814 --- 'pcase' accepts a new UPattern 'eieio'.
819 *** New command 'ido-bury-buffer-at-head' bound to C-S-b
820 Bury the buffer at the head of 'ido-matches', analogous to how C-k
821 kills the buffer at head.
824 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
825 meaning, and the list is restricted to those elements that do not
826 match the current input.
831 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
832 The new commands 'next-line-or-history-element' and
833 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
834 minibuffer, allow by-line movement through minibuffer history,
835 similarly to an ordinary buffer. Only when point moves over
836 the bottom/top of the minibuffer it goes to the next/previous history
837 element. 'M-p' and 'M-n' still move directly to previous/next history
840 ** Search and Replace
843 *** 'isearch' and 'query-replace' can now perform character folding in matches.
844 This is analogous to case folding, but instead of disregarding case
845 variants, it disregards wider classes of distinctions between similar
846 characters. (Case folding is a special case of character folding.)
847 This means many characters in the search string will match entire
848 groups of characters instead of just themselves.
850 For instance, the ASCII double quote character " will match all
851 variants of double quotes, and the letter 'a' will match all of its
852 accented cousins, even those composed of multiple characters, as well
853 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
856 Character folding is enabled by customizing 'search-default-mode' to
857 the value 'character-fold-to-regexp'. You can also toggle character
858 folding in the middle of a search by typing 'M-s ''.
860 'query-replace' honors character folding if the new variable
861 'replace-character-fold' is customized to a non-nil value.
864 *** New user option 'search-default-mode'.
865 This option specifies the default mode for Isearch. The default
866 value, nil specifies that Isearch does literal searches (however,
867 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
868 as in previous Emacs versions).
871 *** New function 'character-fold-to-regexp' can be used
872 by searching commands to produce a regexp matching anything that
873 character-folds into STRING.
876 *** The new M-s M-w key binding uses eww to search the web for the
877 text in the region. The search engine to use for this is specified by
878 the customizable variable 'eww-search-prefix'.
881 *** Query-replace history is enhanced.
882 When query-replace reads the FROM string from the minibuffer, typing
883 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
884 and TO are the original text and its replacement, and SEP is an arrow
885 string defined by the new variable 'query-replace-from-to-separator'.
886 To select a prior replacement, type 'M-p' until the desired
887 replacement appears in the minibuffer, and then exit the minibuffer by
892 *** If 'quick-calc' is called with a prefix argument, insert the
893 result of the calculation into the current buffer.
896 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
897 this you can tell Edebug not to stop at the start of the first
898 instrumented function.
903 *** New minor mode 'global-eldoc-mode'
904 It is turned on by default, and affects '*scratch*' and other buffers
905 whose major mode supports Emacs Lisp.
908 *** 'eldoc-documentation-function' now defaults to 'ignore'
911 *** 'describe-char-eldoc' displays information about character at point,
912 and can be used as a default value of 'eldoc-documentation-function'. It is
913 useful when, for example, one needs to distinguish various spaces - e.g.,
914 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
915 using mono-spaced font.
920 *** HTML can now be rendered using variable-width fonts.
923 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
924 whether to use variable-pitch fonts or not. The user can also
925 customize the 'shr-use-fonts' variable.
928 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
929 whether to use the HTML-specified colors or not. The user can also
930 customize the 'shr-use-colors' variable.
933 *** A new command 'R' ('eww-readable') will try do identify the main
934 textual parts of a web page and display only that, leaving menus and
935 the like off the page.
938 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
939 toggle the paragraph direction between left-to-right and right-to-left.
942 *** Images that are being loaded are now marked with grey
943 "placeholder" images of the size specified by the HTML. They are then
944 replaced by the real images asynchronously, which will also now
945 respect width/height HTML specs (unless they specify widths/heights
946 bigger than the current window).
949 *** You can now use several eww buffers in parallel by renaming eww
950 buffers you want to keep separate.
953 *** Partial state of the eww buffers (the URIs and the titles of the
954 pages visited) is now preserved in the desktop file.
957 *** 'eww-after-render-hook' is now called after eww has rendered
958 the data in the buffer.
961 *** The 'eww-reload' command now takes a prefix to not reload via
962 the net, but just use the local copy of the HTML.
965 *** The DOM shr and eww uses has been changed to the general Emacs
966 xml.el/libxml2 DOM, and a new package dom.el has been added to
967 interact with this DOM. See the Emacs Lisp manual for interface
971 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
974 *** The new 'S' command will list all eww buffers, and allow managing
978 *** https pages with valid certificates have headers marked in green, while
979 invalid certificates are marked in red.
984 *** text/html messages that contain inline image parts will be
985 transformed into multipart/related messages before sending.
988 *** The 'message-valid-fqdn-regexp' variable has been removed, since
989 there are now top-level domains added all the time. Message will no
990 longer warn about sending emails to top-level domains it hasn't heard
993 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
994 In 'visual-line-mode' it will look for the true beginning of a header
995 while in non-'visual-line-mode' it will move the point to the indented
999 ** In Show Paren Mode, a parenthesis can be highlighted when point
1000 stands inside it, and certain parens can be highlighted when point is
1001 at BOL or EOL, or in whitespace there. To enable these, customize,
1002 respectively, 'show-paren-when-point-inside-paren' or
1003 'show-paren-when-point-in-periphery'.
1006 ** If gpg2 exists on the system, it is now used as the default value
1007 of 'epg-gpg-program' (instead of gpg).
1012 *** Images are automatically scaled before displaying based on the
1013 'image-scaling-factor' variable (if Emacs supports scaling the images
1017 *** Images inserted with 'insert-image' and related functions get a
1018 keymap put into the text properties (or overlays) that span the
1019 image. This keymap binds keystrokes for manipulating size and
1020 rotation, as well as saving the image to a file. These commands are
1021 also available in 'image-mode'.
1024 *** A new library for creating and manipulating SVG images has been
1025 added. See the "SVG Images" section in the lispref manual for
1029 *** New setf-able function to access and set image parameters is
1030 provided: 'image-property'.
1036 *** Strings after ':documentation' are highlighted as docstrings.
1037 This enhances Lisp mode fontification to handle documentation of the
1038 form '(:documentation "the doc string")' used in Common Lisp code for
1039 CLOS class and slot documentation.
1041 ** Rectangle editing
1044 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
1047 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
1048 *** 'string-rectangle' provides on-the-fly preview of the result.
1051 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
1052 These should be used in preference to 'font-lock-fontify-buffer' when
1056 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
1057 to 'minibuffer-setup-hook'.
1059 If the first argument of the macro is of the form '(:append FUN)',
1060 then FUN will be appended to 'minibuffer-setup-hook', instead of
1065 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
1068 *** 'pcase' accepts the new UPattern 'cl-struct'.
1070 ** Calendar and diary
1073 *** The default 'diary-file' is now located in .emacs.d.
1076 *** New commands to insert diary entries with Chinese dates:
1077 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
1078 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
1081 *** The calendar can now list and mark diary entries with Chinese dates.
1082 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
1085 *** The option 'calendar-mode-line-format' can now be nil,
1086 which means to do nothing special with the mode line in calendars.
1089 *** New option 'calendar-weekend-days'.
1090 The option customizes which day headers receive the
1091 'calendar-weekend-header' face.
1094 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
1097 *** Many items obsolete since at least version 23.1 have been removed.
1098 The majority were function/variable/face aliases, too numerous to list here.
1101 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
1102 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
1104 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
1106 **** Macro 'calendar-for-loop'.
1108 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
1110 **** The nil and list forms of 'diary-display-function'.
1113 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
1114 If the output of ERT tests in batch mode execution can be saved to a
1115 log file, then it can be passed as an argument to the above function
1116 to produce a neat summary.
1119 ** New js.el option 'js-indent-first-init'.
1124 ** Info mode now displays symbol names in fixed-pitch font.
1125 If you want to get the old behavior back, customize the 'Info-quoted'
1126 face to use the same definitions as the default face.
1129 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
1132 *** 'info-display-manual' can now be given a prefix argument which (any
1133 non-nil value) directs the command to limit the completion
1134 alternatives to currently visited manuals.
1137 ** ntlm.el has support for NTLM2.
1142 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
1143 to delete or undelete multiple messages.
1146 *** Rmail can now render HTML mail messages if your Emacs was built with
1147 libxml2 or if you have the Lynx browser installed. By default, Rmail
1148 will display the HTML version of a mail message that has both HTML and
1149 plain text parts, if display of HTML email is possible; customize the
1150 'rmail-mime-prefer-html' option to 'nil' if you don't want that.
1153 *** In the commands that make summaries by subject, recipients, or senders,
1154 you can no longer use commas to separate regular expressions.
1157 ** SES now supports local printer functions; see 'ses-define-local-printer'.
1159 ** Shell-script Mode
1161 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
1162 specify the type of shell in use (bash, csh, etc).
1165 *** New value 'always' for 'sh-indent-after-continuation'.
1166 This provides old-style ("dumb") indentation of continued lines.
1167 See the doc string of 'sh-indent-after-continuation' for details.
1171 *** Fatal TLS errors are now silent by default.
1174 *** If Emacs isn't built with TLS support, an external TLS-capable
1175 program is used instead. This program used to be run in --insecure
1176 mode by default, but has now changed to be secure instead, and will
1177 fail if you try to connect to non-verifiable hosts. This is
1178 controlled by the 'tls-program' variable.
1183 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1184 When 'url-handler-mode' is enabled, file operations for these
1185 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1188 *** The URL package allows customizing the 'url-user-agent' string.
1189 The new 'url-user-agent' variable can be customized to be a string or
1193 *** The new interface variable 'url-request-noninteractive' can be used
1194 to specify that we're running in a noninteractive context, and that
1195 we should not be queried about things like TLS certificate validity.
1198 *** 'url-mime-accept-string' can now be used as in "interface"
1199 variable, meaning you can bind it around an 'url-retrieve' call.
1202 *** If URL is used with a https connection, the first callback argument
1203 plist will contain a :peer element that has the output of
1204 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
1207 *** The new function 'url-cookie-delete-cookie' can be used to
1208 programmatically delete all cookies, or cookies from a specific
1214 *** New connection method "afp", which allows you to access Mac OS X
1215 volumes via the Apple Filing Protocol.
1218 *** New connection method "nc", which allows you to access dumb
1222 *** Method-specific parameters can be overwritten now with variable
1223 'tramp-connection-properties'.
1226 *** Handler for 'file-notify-valid-p' for remote machines that support
1227 filesystem notifications.
1232 *** New user variable 'sql-default-directory' enables remote
1233 connections using Tramp.
1236 *** New command 'sql-send-line-and-next'.
1237 This command, bound to 'C-c C-n' by default, sends the current line to
1238 the SQL process and advances to the next line, skipping whitespace and
1242 *** Added support for Vertica SQL.
1244 ** VC and related modes
1247 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
1248 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1249 (undocumented) command vc-hg-push now behaves slightly differently.
1252 *** The new command vc-region-history shows the log+diff of the active region.
1255 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
1256 This command is useful when you perform version control commands
1257 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1258 back-end for the buffer's file, or remove it from version control.
1261 *** The VC state indicator in the mode line now defaults to more
1262 colorful faces to make it more obvious to the user what the state is.
1263 See the 'vc-faces' customization group.
1266 *** New option 'vc-annotate-background-mode' controls whether
1267 the color range from 'vc-annotate-color-map' is applied to the
1268 background or to the foreground.
1271 *** 'compare-windows' now compares text with the most recently selected window
1272 instead of the next window. If you want the previous behavior of
1273 comparing with the next window, customize the new option
1274 'compare-windows-get-window-function' to the value
1275 'compare-windows-get-next-window'.
1278 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
1279 replace the face 'compare-windows', which is now an obsolete alias for
1280 'compare-windows-added'.
1283 *** The VC state indicator in the mode line now has different faces
1284 corresponding to each of the possible states. See the 'vc-faces'
1285 customization group.
1288 *** 'log-edit-insert-changelog' converts "(tiny change)" to
1289 "Copyright-paperwork-exempt: yes". Set 'log-edit-rewrite-tiny-change'
1290 nil to disable this.
1293 ** VHDL mode now supports VHDL'08.
1298 *** Decimal display mode uses "," groups, so it's more
1299 fitting for use in money calculations
1302 *** Factorial works with non-integer inputs.
1307 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1308 macro argument expansion, interactive macro evaluation and automatic
1309 scanning of #define'd symbols.
1312 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
1313 result of evaluating a macro.
1316 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
1317 all defined symbols in 'hide-ifdef-env'.
1320 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
1321 file name patterns. Defaults to files whose extension is one of '.h',
1322 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
1325 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
1326 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1327 (This could happen when an idempotent header file is visited again,
1328 when its guard symbol is already defined.) Defaults to 't'.
1331 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
1332 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1333 looking for macro definitions. By default, no symbols are ignored.
1338 *** New custom variable 'tex-print-file-extension' to help users who
1339 use PDF instead of DVI.
1342 *** TeX mode now supports Prettify Symbols mode. When enabling
1343 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1344 many other math macros are displayed using unicode characters.
1347 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
1348 By default, 32 consecutive spaces or four consecutive TABs are
1349 considered to be too deep, but the new variable
1350 'whitespace-big-indent-regexp' can be customized to change that.
1353 ** New options in 'tildify-mode'.
1354 New options 'tildify-space-string', 'tildify-pattern', and
1355 'tildify-foreach-region-function' variables make
1356 'tildify-string-alist', 'tildify-pattern-alist', and
1357 'tildify-ignored-environments-alist' variables (as well as a few
1358 helper functions) obsolete.
1361 ** New package Xref replaces Etags's front-end and UI
1363 The new package Xref provides a generic framework and new commands to
1364 find and move to definitions of functions, macros, data structures
1365 etc., as well as go back to the location where you were before moving
1366 to a definition. It supersedes and obsoletes many Etags commands,
1367 while still using the etags.el code that reads the TAGS tables as one
1370 The command 'xref-find-definitions' replaces 'find-tag' and provides
1371 an interface to pick one definition among several.
1372 'tags-loop-continue' is now unbound. 'xref-pop-marker-stack' replaces
1373 'pop-tag-mark', but has a keybinding ('M-,') different from the one
1374 'pop-tag-mark' used.
1376 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
1377 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
1378 'xref-find-apropos' replaces 'find-tag-regexp'.
1380 As a result of this, the following commands are now obsolete:
1381 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
1384 'tags-loop-continue' is not obsolete because it's still useful in
1385 'tags-search' and 'tags-query-replace', for which there are no direct
1389 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
1390 replaced by xref-style commands, see the "Dired" section below.
1395 'find-tag-marker-ring-length' is now an obsolete alias for
1396 'xref-marker-ring-length'. 'find-tag-marker-ring' is now an obsolete
1397 alias for a private variable. 'xref-push-marker-stack' and
1398 'xref-pop-marker-stack' should be used instead to manipulate the stack
1399 of searches for definitions.
1402 *** 'xref-find-definitions' and 'describe-function' now display
1403 information about mode local overrides (defined by cedet/mode-local.el
1404 'define-overloadable-function' 'define-mode-local-overrides').
1406 The framework's Lisp API is still experimental and can change in major,
1407 backward-incompatible ways.
1410 ** New package Project
1412 The new package Project provides generic infrastructure for dealing
1413 with projects. The main commands included in it are
1414 'project-find-file' and 'project-find-regexp'.
1416 The Lisp API of this package is still experimental.
1419 EUDC's LDAP backend has been improved.
1422 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1425 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1426 subprocess instead of on the command line.
1429 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1430 need to configure this manually anymore.
1433 *** The LDAP configuration section of EUDC's manual has been
1436 There have also been customization changes.
1439 *** New custom variable 'eudc-server-hotlist' to allow specifying
1440 multiple EUDC servers in init file.
1443 *** Custom variable 'eudc-inline-query-format' defaults to completing
1444 on email and firstname instead of surname.
1447 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
1448 to avoid interfering with the kill ring.
1451 *** Custom variable 'eudc-inline-expansion-format' defaults to
1452 "Firstname Surname <mail-address>".
1455 *** Custom variable 'eudc-options-file' defaults to
1456 "~/.emacs.d/eudc-options".
1459 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
1460 allow overriding the regular expression that recognizes the ldapsearch
1461 command line's password prompt.
1464 EUDC's BBDB backend now supports BBDB 3.
1467 EUDC's PH backend (eudcb-ph.el) is obsolete.
1472 *** The new built-in command 'clear' can scroll window contents out of sight.
1473 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1476 *** New buffer syntax '#<buffer-name>', which is equivalent to
1477 '#<buffer buffer-name>'. This shorthand makes interacting with
1478 buffers from eshell more convenient. Custom variable
1479 'eshell-buffer-shorthand', which has been broken for a while, has been
1483 *** By default, eshell "visual" program buffers (created by
1484 'eshell-visual-commands' and similar custom vars) are no longer killed
1485 when their processes die. This fixes issues with short-lived commands
1486 and makes visual programs more useful in general. For example, if
1487 "git log" is a visual command, it will always show the visual command
1488 buffer, even if the "git log" process dies. For the old behavior,
1489 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
1494 *** Support for the Google Chrome web browser.
1497 *** Support for the Conkeror web browser.
1500 *** Support for several ancient browsers is now officially obsolete.
1503 ** tar-mode: new 'tar-new-entry' command, allowing for new members to
1504 be added to the archive.
1509 *** Dired buffers are also auto-reverted via file notifications, if
1510 Emacs is compiled with file notification support.
1513 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
1514 See <http://debbugs.gnu.org/22814>.
1516 ** File Notifications
1519 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1522 *** The new event 'stopped' signals, that a file notification watch is
1523 not active any longer.
1526 *** The new function 'file-notify-valid-p' checks, whether a file
1527 notification descriptor still corresponds to an activate watch.
1532 *** The command 'dired-do-compress' bound to 'Z' now can compress
1533 directories and decompress zip files.
1536 *** New command 'dired-do-compress-to' bound to 'c' can be used to
1537 compress many marked files into a single named archive. The
1538 compression command is determined from the new
1539 'dired-compress-files-alist' variable.
1542 *** In wdired, when editing files to contain slash characters,
1543 the resulting directories are automatically created. Whether
1544 to do this or not is controlled by the
1545 'wdired-create-parent-directories' variable.
1548 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
1549 viewing HTML files and the like.
1551 *** New user interface for the 'A' and 'Q' commands.
1552 These keys, now bound to 'dired-do-find-regexp' and
1553 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
1554 and 'xref-query-replace-in-results': they present the matches
1555 in the '*xref*' buffer and let you move through the matches. No need
1556 to use 'tags-loop-continue' to resume the search or replace loop. The
1557 previous commands, 'dired-do-search' and
1558 'dired-do-query-replace-regexp', are still available, but not bound to
1559 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
1560 back. We intend to obsolete the old commands in a future release.
1562 ** Tabulated List Mode
1565 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
1566 call 'tabulated-list-init-header', in which case it will have no
1570 *** 'tabulated-list-print' takes a second optional argument, update,
1571 which specifies an alternative printing method which is faster when
1572 few or no entries have changed.
1574 ** Obsolete packages
1580 *** landmark.el (moved to elpa.gnu.org)
1583 * New Modes and Packages in Emacs 25.1
1586 ** pinentry.el allows GnuPG passphrase to be prompted through the
1587 minibuffer instead of a graphical dialog, depending on whether the gpg
1588 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1589 is set). This feature requires newer versions of GnuPG (2.1.5 or
1590 later) and Pinentry (0.9.5 or later). To use this feature, add
1591 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1592 configuration with "gpgconf --reload gpg-agent".
1595 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1596 The main entry points are 'cl-defgeneric' and 'cl-defmethod'. See the
1597 node "Generic Functions" in the Emacs Lisp manual for more details.
1600 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1601 SCSS (Sassy CSS) files.
1604 ** let-alist is a new macro (and a package) that allows one to easily
1605 let-bind the values stored in an alist.
1608 ** 'tildify-mode' allows automatic insertion of hard spaces as one
1609 types the text. Breaking line after a single-character words is
1610 forbidden by Czech and Polish typography (and may be discouraged in
1611 other languages), so 'auto-tildify-mode' makes it easier to create
1612 a typographically-correct documents.
1615 ** The 'seq' library adds sequence manipulation functions and macros
1616 that complement basic functions provided by subr.el. All functions
1617 are prefixed with 'seq-' and work on lists, strings and vectors.
1618 'pcase' accepts a new Upattern 'seq'.
1621 ** The 'map' library provides map-manipulation functions that work on
1622 alists, hash-table and arrays. All functions are prefixed with
1623 'map-'. 'pcase' accepts a new UPattern 'map'.
1626 ** The 'thunk' library provides functions and macros to control the
1627 evaluation of forms.
1630 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1631 support for JSX, an XML-like syntax extension to ECMAScript.
1634 * Incompatible Lisp Changes in Emacs 25.1
1637 ** 'setq' and 'setf' must now be called with an even number of
1638 arguments. The earlier behavior of silently supplying a nil to the
1639 last variable when there was an odd number of arguments has been
1643 ** 'syntax-begin-function' is declared obsolete.
1644 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1645 slot in font-lock-defaults.
1648 ** The new implementation of Subword mode affects word movement everywhere.
1649 When Subword mode is turned on, 'forward-word', 'backward-word', and
1650 everything that uses them will move by sub-words, effectively
1651 overriding the buffer's syntax table. Lisp programs that shouldn't be
1652 affected by Subword mode should call the new functions
1653 'forward-word-strictly' and 'backward-word-strictly' instead.
1656 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
1657 called during startup. Users who call this function in their init
1658 file and still expect it to be run after startup should set
1659 'package-enable-at-startup' to t after the call to
1660 'package-initialize'.
1663 ** ':global' minor mode use 'setq-default' rather than 'setq'.
1664 This means that you can't use 'make-local-variable' and expect them to
1665 "magically" become buffer-local.
1668 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
1669 The 'track-mouse' form no longer refrains from changing the shape of
1670 the mouse pointer for the entire time the body of that form is
1671 executed. Lisp programs that use 'track-mouse' for dragging across
1672 large portions of the Emacs display, and want to avoid changes in the
1673 pointer shape during dragging, should bind the variable 'track-mouse'
1674 to the special value 'dragging' in the body of the form.
1677 ** The optional 'predicate' argument of 'lisp-complete-symbol' no longer
1678 has any effect. (This change was made in Emacs 24.4 but was not
1679 advertised at the time.)
1682 ** 'indirect-function' does not signal 'void-function' any more.
1683 This is mostly a bug-fix, since this change was missed back in 24.4 when
1684 symbol-function was changed not to signal 'void-function' any more.
1687 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
1690 ** Comint, term, and compile do not set the EMACS env var any more.
1691 Use the INSIDE_EMACS environment variable instead.
1693 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
1694 mode to send the same escape sequences that xterm does. This makes
1695 things like forward-word in readline work.
1698 ** hideshow mode got four key bindings that are analogous to outline
1699 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
1702 ** 'save-excursion' does not save&restore the mark any more.
1703 Use 'save-mark-and-excursion' if you want the old behavior.
1706 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
1707 argument ('predicate').
1710 ** 'completion-table-dynamic' by default stays in the minibuffer.
1711 The minibuffer will be the current buffer when the function is called.
1712 If you want the old behavior of calling the function in the buffer
1713 from which the minibuffer was entered, use the new argument
1714 'switch-buffer' to 'completion-table-dynamic'.
1717 ** window-configurations no longer record the buffers' marks.
1720 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1721 active region handling.
1724 ** deactivate-mark is now buffer-local.
1727 ** 'cl-the' now asserts that its argument is of the given type.
1730 ** 'process-running-child-p' may now return a numeric process
1731 group ID instead of 't'.
1734 ** Mouse click events on mode line or header line no longer include
1735 any reference to a buffer position. The 6th member of the mouse
1736 position list returned for such events is now nil.
1739 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1740 These slots used to hold key-shortcut data, but have been obsolete since
1744 ** Emacs no longer downcases the first letter of a system diagnostic
1745 when signaling a file error. For example, it now reports "Permission
1746 denied" instead of "permission denied". The old behavior was problematic
1747 in languages like German where downcasing rules depend on grammar.
1750 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
1751 Set it to 'curve' for curved single quotes, to 'straight' for straight
1752 apostrophes, and to 'grave' for grave accent and apostrophe. The
1753 default value nil acts like 'curve' if curved single quotes are
1754 displayable, and like 'grave' otherwise. The new variable affects
1755 display of diagnostics and help, but not of info.
1758 ** substitute-command-keys now replaces quotes.
1759 That is, it converts documentation strings' quoting style as per the
1760 value of 'text-quoting-style'. Doc strings in source code can use
1761 either curved single quotes or grave accents and apostrophes. As
1762 before, characters preceded by \= are output as-is.
1765 ** Message-issuing functions 'error', 'message', etc. now convert quotes.
1766 They use the new 'format-message' function instead of plain 'format',
1767 so that they now follow user preference as per 'text-quoting-style'
1768 when processing curved single quotes, grave accents, and apostrophes
1769 in their format argument.
1772 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1773 now match multibyte characters using Unicode character properties.
1774 If you want the old behavior where they matched any character with
1775 word syntax, use '\sw' instead.
1778 ** The character classes [:graph:] and [:print:] in regular expressions
1779 no longer match every multibyte character. Instead, Emacs now
1780 consults the Unicode character properties to determine which
1781 characters are graphic or printable. In particular, surrogates and
1782 unassigned codepoints are now rejected. If you want the old behavior,
1783 use [:multibyte:] instead.
1786 ** The 'diff' command uses the unified format now. To restore the old
1787 behavior, set 'diff-switches' to '-c'.
1790 ** 'grep-template' and 'grep-find-template' values don't include the
1791 --color argument anymore. It's added at the <C> place holder position
1792 dynamically. Any third-party code that changes these templates should
1793 be updated accordingly.
1795 ** The grep/rgrep/lgrep functions will now ask about saving files
1796 before running. This is controlled by the 'grep-save-buffers'
1800 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
1801 The new behavior is compatible with Common Lisp and with XEmacs.
1802 This change does not affect Lisp code intended to be portable to
1803 Emacs 24.2 and earlier, which did not support unary '/'.
1806 ** The 'default-directory' value doesn't have to end slash. To make
1807 that happen, 'unhandled-file-name-directory' now defaults to calling
1808 'file-name-as-directory'.
1811 * Lisp Changes in Emacs 25.1
1815 *** New UPatterns 'quote', 'app'.
1817 *** New UPatterns can be defined with 'pcase-defmacro'.
1819 *** New vector QPattern.
1822 ** syntax-propertize is now automatically called on-demand during forward
1823 parsing functions like 'forward-sexp'.
1826 ** New hooks 'prefix-command-echo-keystrokes-functions' and
1827 'prefix-command-preserve-state-hook' allow the definition of prefix
1828 commands other than the predefined 'C-u'.
1831 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
1832 These allow conversion between buffer positions and the corresponding
1833 file byte offsets, given the file's encoding.
1836 ** The default value of 'load-read-function' is now 'read'.
1837 Previously, the default value of 'nil' implied using 'read'.
1840 ** New hook 'pre-redisplay-functions'.
1841 It is a bit easier to use than 'pre-redisplay-function'.
1844 ** The second arg of 'looking-back' should always be provided explicitly.
1845 Previously, it was an optional argument, now it's mandatory.
1848 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
1849 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
1850 implemented by the new 'cursor-intangible-mode' and
1851 'cursor-sensor-mode' minor modes.
1854 ** 'inhibit-point-motion-hooks' now defaults to 't' and is obsolete.
1855 Use the new minor modes 'cursor-intangible-mode' and
1856 'cursor-sensor-mode' instead.
1859 ** New process type 'pipe', which can be used in combination with the
1860 ':stderr' keyword of make-process to handle standard error output
1864 ** New function 'make-process' provides an alternative interface to
1865 'start-process'. It allows programs to set process parameters such as
1866 process filter, sentinel, etc., through keyword arguments (similar to
1867 'make-network-process').
1870 ** A new function 'directory-files-recursively' returns all matching
1871 files (recursively) under a directory.
1874 ** New variable 'inhibit-message', when bound to non-nil, inhibits
1875 'message' and related functions from displaying messages in the echo
1876 area. The output is still logged to the *Messages* buffer.
1879 ** A new text property 'inhibit-read-only' can be used in read-only
1880 buffers to allow certain parts of the text to be writable.
1883 ** A new variable 'comment-end-can-be-escaped' is useful in languages
1884 such as C and C++ where line comments with escaped newlines are
1885 continued to the next line.
1888 ** New macro 'define-advice'.
1891 ** Emacs Lisp now supports generators.
1892 See the "Generators" section of the ELisp manual for the details.
1895 ** New finalizer facility for running code when objects become unreachable.
1896 See the "Finalizer Type" subsection in the ELisp manual for the
1900 ** lexical closures can use (:documentation FORM) to build their docstring.
1901 It should be placed right where the docstring would be, and FORM is then
1902 evaluated (and should return a string) when the closure is built.
1905 ** The new command 'fortune-message' has been added, which displays
1906 fortunes in the echo area.
1909 ** define-inline provides a new way to define inlinable functions.
1912 ** New function 'macroexpand-1' to perform a single step of macro expansion.
1915 ** Some "x-*" functions were obsoleted and/or renamed:
1916 *** x-select-text is renamed gui-select-text.
1917 *** x-selection-value is renamed gui-selection-value.
1918 *** x-get-selection is renamed gui-get-selection.
1919 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1920 *** x-get-selection-value is renamed to gui-get-primary-selection.
1921 *** x-set-selection is renamed to gui-set-selection
1924 ** New function 'string-greaterp', which return the opposite result of
1928 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
1929 preserve the collation order as defined by the system's locale(1)
1930 environment. For the time being this is implemented for modern POSIX
1931 systems and for MS-Windows, for other systems they fall back to their
1932 counterparts 'string-lessp' and 'string-equal'.
1935 ** The new function 'string-version-lessp' compares strings by
1936 interpreting consecutive runs of numerical characters as numbers, and
1937 compares their numerical values. According to this predicate,
1938 "foo2.png" is smaller than "foo12.png".
1941 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
1942 The effect is that, on systems that use ls-lisp for Dired, the default
1943 sort order of the files in Dired is now different from what it was in
1944 previous versions of Emacs. In particular, the file names are sorted
1945 disregarding punctuation, accents, and diacritics, and letter case is
1946 ignored. For example, files whose name begin with a period will no
1947 longer appear near the beginning of the directory listing. If you
1948 want the old, locale-independent sorting, customize the new option
1949 'ls-lisp-use-string-collate' to the nil value.
1952 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
1953 if set to a non-nil value, causes the above 2 functions to ignore
1954 symbol and punctuation characters when collating strings. This
1955 emulates the behavior of modern Posix platforms when the locale's
1956 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1957 MS-Windows doesn't support UTF-8 as codeset in its locales.
1960 ** New function 'alist-get', which is also a valid place (aka lvalue).
1963 ** New function 'funcall-interactively', which works like 'funcall'
1964 but makes 'called-interactively-p' treat the function as (you guessed it)
1965 called interactively.
1968 ** New function 'function-put' to use instead of 'put' for function properties.
1971 ** The new function 'bidi-find-overridden-directionality' allows you to
1972 find characters whose directionality was, perhaps maliciously,
1973 overridden by directional override control characters. Lisp programs
1974 can use this to detect potential phishing of URLs and other links that
1975 exploits bidirectional display reordering.
1978 ** The new function 'buffer-substring-with-bidi-context' allows you to
1979 copy a portion of a buffer into a different location while preserving
1980 the visual appearance both of the copied text and the text at
1981 destination, even when the copied text includes mixed bidirectional
1982 text and directional control characters.
1985 ** New properties that can be specified with 'declare':
1986 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1987 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1988 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1992 ** New macro 'with-file-modes', for evaluating expressions with default file
1993 permissions set to temporary values (e.g., for creating private files).
1996 ** You can access the slots of structures using 'cl-struct-slot-value'.
1999 ** Function 'sort' can deal with vectors.
2002 ** Function 'system-name' now returns an updated value if the current
2003 system's name has changed or if the Emacs process has changed systems,
2004 and to avoid long waits it no longer consults DNS to canonicalize the
2005 name. The variable 'system-name' is now obsolete.
2008 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
2011 ** If 'pwd' is called with a prefix argument, insert the current default
2015 ** New functions return extended information about fonts and faces.
2018 *** The function 'font-info' now returns more details about a font.
2019 In particular, it now returns the average width of the font's
2020 characters, which can be used for geometry-related calculations.
2023 *** A new function 'default-font-width' returns the average width of a
2024 character in the current buffer's default font. If the default face
2025 is remapped (see 'face-remapping-alist'), the value for the remapped
2026 face is returned. This function complements the existing function
2027 'default-font-height'.
2030 *** New functions 'window-font-height' and 'window-font-width' return
2031 the height and average width of characters in a specified face and
2032 window. If FACE is remapped (see 'face-remapping-alist'), the
2033 function returns the information for the remapped face.
2036 *** A new function 'window-max-chars-per-line' returns the maximal
2037 number of characters that can be displayed on one line. If a face
2038 and/or window are provided, these values are used for the
2039 calculation. This function is different from 'window-body-width' in
2040 that it accounts for (i) continuation glyphs, (ii) the size of the
2041 font, and (iii) the specified window.
2044 ** New utilities in subr-x.el:
2045 *** New macros 'if-let' and 'when-let' allow defining bindings and to
2046 execute code depending whether all values are true.
2047 *** New macros 'thread-first' and 'thread-last' allow threading a form
2048 as the first or last argument of subsequent forms.
2051 ** Documentation strings now support quoting with curved single quotes
2052 in addition to the old style with grave accent and apostrophe. The
2053 new style looks better on today's displays. In the new Electric Quote
2054 mode, you can enter curved single quotes into documentation by typing
2055 grave accent and apostrophe. Outside Electric Quote mode, you can
2056 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
2057 works) by typing 'A-[' and 'A-]'. As described above under
2058 'text-quoting-style', the user can specify how to display doc string
2062 ** New function 'format-message' is like 'format' and also converts
2063 curved single quotes, grave accents and apostrophes as per
2064 'text-quoting-style'.
2067 ** show-help-function's arg is converted via substitute-command-keys
2068 before being passed to the function. Help strings, help-echo
2069 properties, etc. can therefore contain command key escapes and
2073 ** Time-related changes:
2075 *** Time conversion functions now accept an optional ZONE argument
2076 that specifies the time zone rules for conversion. ZONE is omitted or
2077 nil for Emacs local time, t for Universal Time, 'wall' for system wall
2078 clock time, or a string as in 'set-time-zone-rule' for a time zone
2079 rule. The affected functions are 'current-time-string',
2080 'current-time-zone', 'decode-time', and 'format-time-string'. The
2081 function 'encode-time', which already accepted a simple time zone rule
2082 argument, has been extended to accept all the new forms.
2084 *** Time-related functions now consistently accept numbers
2085 (representing seconds since the epoch) and nil (representing the
2086 current time) as well as the usual list-of-integer representation.
2087 Affected functions include 'current-time-string', 'current-time-zone',
2088 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
2089 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
2090 'time-to-days', and 'time-to-seconds'.
2092 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
2095 *** 'calendar-next-time-zone-transition', 'time-add', and
2096 'time-subtract' no longer return time values in the obsolete and
2097 undocumented integer-pair format. Instead, they return a list of two
2101 ** New function 'set-binary-mode' allows switching a standard stream
2102 of the Emacs process to binary I/O mode.
2105 ** The new function 'directory-name-p' can be used to check whether a file
2106 name (as returned from, for instance, 'file-name-all-completions') is
2107 a directory file name. It returns non-nil if the last character in
2108 the name is a directory separator character (forward slash on GNU and
2109 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2112 ** ASCII approximations to curved quotes are put in standard-display-table
2113 if the terminal cannot display curved quotes.
2116 ** Standard output and error streams now transliterate characters via
2117 standard-display-table, and encode output using locale-coding-system.
2118 To force a specific encoding, bind 'coding-system-for-write' to the
2119 coding-system of your choice when invoking functions like 'prin1' and
2123 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
2126 ** New possible value for 'system-type': 'nacl'.
2127 This is used by Google's Native Client (NaCl).
2130 ** 'read-color' will now display the color names using the color itself
2131 as the background color.
2134 ** There is now a new variable 'flyspell-sort-corrections-function'
2135 that allows changing the way corrections are sorted.
2137 ** Miscellaneous name change
2140 For consistency with the usual Emacs spelling, the Lisp variable
2141 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
2142 The old name should still work, as an obsolescent alias.
2144 ** Changes in Frame- and Window- Handling
2147 *** Emacs can now draw horizontal scroll bars on some platforms that
2148 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2149 Horizontal scroll bars are turned off by default.
2151 **** New function 'horizontal-scroll-bars-available-p' telling whether
2152 horizontal scroll bars are available on the underlying system.
2154 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
2155 bars on all existing and future frames.
2157 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
2158 scroll bars on the selected frame.
2160 **** New frame parameters 'horizontal-scroll-bars' and
2161 'scroll-bar-height' to set horizontal scroll bars and their height
2162 for individual frames and in 'default-frame-alist'.
2164 **** New functions 'frame-scroll-bar-height' and
2165 'window-scroll-bar-height' return the height of horizontal scroll
2166 bars on a specific frame or window.
2168 **** 'set-window-scroll-bars' now accepts five parameters where the last
2169 two specify height and type of the window's horizontal scroll bar.
2171 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
2174 **** New buffer-local variables 'horizontal-scroll-bar' and
2175 'scroll-bar-height'.
2178 *** New functions 'frame-geometry' and 'frame-edges' give access to a
2182 *** New functions 'mouse-absolute-pixel-position' and
2183 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
2187 *** The function 'window-edges' now accepts three additional arguments to
2188 retrieve body, absolute and pixel edges of the window.
2191 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
2192 'window-inside-absolute-pixel-edges' have been renamed to respectively
2193 'window-body-edges', 'window-body-pixel-edges' and
2194 'window-absolute-body-pixel-edges'. The old names are kept as aliases.
2197 *** New function 'window-absolute-pixel-position' to get the screen
2198 coordinates of a visible buffer position.
2201 *** The height of a frame's menu and tool bar are no longer counted in the
2202 frame's text height. This means that the text height stands only for
2203 the height of the frame's root window plus that of the echo area (if
2204 present). This was already the behavior for frames with external tool
2205 and menu bars (like in the Gtk builds) but has now been extended to all
2209 *** Frames now do not necessarily preserve the number of columns or lines
2210 they display when setting default font, menu bar, fringe width, or
2211 scroll bars. In particular, maximized and fullscreen frames are
2212 conceptually never resized if such settings change. For fullheight and
2213 fullwidth frames, the behavior may depend on the toolkit used.
2214 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
2215 setting default font, menu bar, fringe width, or scroll bars of a
2216 specific frame does not resize that frame in order to preserve the
2217 number of columns or lines it displays.
2220 *** New function 'window-preserve-size' allows you to preserve the size of
2221 a window without "fixing" it. It's supported by 'fit-window-to-buffer',
2222 'temp-buffer-resize-mode' and 'display-buffer'.
2225 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
2226 This displays the buffer in an existing frame other than the current
2227 frame, and allows the caller to specify a frame predicate to exclude
2231 *** New minor mode 'window-divider-mode' and options
2232 'window-divider-default-places', 'window-divider-default-bottom-width'
2233 and 'window-divider-default-right-width'.
2236 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2237 Those features have been deprecated in Gtk+ for a long time.
2242 *** etags no longer qualifies class members by default.
2244 By default, 'etags' will not qualify class members for Perl and C-like
2245 object-oriented languages with their class names and namespaces, and
2246 will remove qualifications used explicitly in the code from the tag
2247 names it puts in TAGS files. This is so the etags.el back-end for
2248 'xref-find-definitions' is more accurate and produces less false
2251 Use --class-qualify (-Q) if you want the old default behavior of
2252 qualifying class members in C++, Java, Objective C, and Perl. Note
2253 that using -Q might make some class members become "unknown" to 'M-.'
2254 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
2255 qualified names by hand.
2258 *** New language Ruby
2260 Names of modules, classes, methods, functions, and constants are
2261 tagged. Overloaded operators are also tagged.
2265 Names of packages, functions, and types are tagged.
2268 *** Improved support for Lua
2270 Etags now tags functions even if the "function" keyword follows some
2271 whitespace at line beginning.
2274 * Changes in Emacs 25.1 on Non-Free Operating Systems
2277 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2278 This includes the makefile.w32-in files in various subdirectories, and
2279 the support files. The file nt/configure.bat now just tells the user
2280 to use the procedure described in nt/INSTALL, by running the Posix
2281 'configure' script in the top-level directory.
2284 ** Building Emacs for MS-Windows requires at least Windows XP
2285 or Windows Server 2003. The built binaries still run on all versions
2286 of Windows starting with Windows 9X.
2289 ** Emacs running on MS-Windows now supports the daemon mode.
2292 ** The byte counts in etags-generated TAGS files are now the same on
2293 MS-Windows as they are on other platforms.
2296 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2297 Pass '--without-ns' to configure to create an X11 build, the old default.
2300 ** OS X 10.5 or older is no longer supported.
2303 ** OS X on PowerPC is no longer supported.
2306 ** New variable 'ns-use-fullscreen-animation' controls animation for
2307 non-native NS fullscreen. The default is nil. Set to t to enable
2308 animation when entering and leaving fullscreen. For native OSX fullscreen
2312 ** The new function 'w32-application-type' returns the type of an
2313 MS-Windows application given the name of its executable program file.
2315 ** New variable 'w32-pipe-buffer-size'.
2316 It can be used to tune the size of the buffer of pipes created for
2317 communicating with subprocesses, when the program run by a subprocess
2318 exhibits unusual buffering behavior. Default is zero, which lets the
2319 OS use its default size.
2322 ----------------------------------------------------------------------
2323 This file is part of GNU Emacs.
2325 GNU Emacs is free software: you can redistribute it and/or modify
2326 it under the terms of the GNU General Public License as published by
2327 the Free Software Foundation, either version 3 of the License, or
2328 (at your option) any later version.
2330 GNU Emacs is distributed in the hope that it will be useful,
2331 but WITHOUT ANY WARRANTY; without even the implied warranty of
2332 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2333 GNU General Public License for more details.
2335 You should have received a copy of the GNU General Public License
2336 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2342 paragraph-separate: "[
\f]*$"