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,
38 * Startup Changes in Emacs 25.2
41 * Changes in Emacs 25.2
44 ** `align-regexp' has a separate history for its interactive argument
45 `align-regexp' no longer shares its history with all other
46 history-less functions that use `read-string'
49 ** The networking code has been reworked so that it's more
50 asynchronous than it was (when specifying :nowait t in
51 `make-network-process'). How asynchronous it is varies based on the
52 capabilities of the system, but on a typical GNU/Linux system the DNS
53 resolution, the connection, and (for TLS streams) the TLS negotiation
54 are all done without blocking the main Emacs thread. To get
55 asynchronous TLS, the TLS boot parameters have to be passed in (see
56 the manual for details).
58 Certain process oriented functions (like `process-datagram-address')
59 will block until socket setup has been performed. The recommended way
60 to deal with asynchronous sockets is to avoid interacting with them
61 until they have changed status to "run". This is most easily done
62 from a process sentinel.
64 ** `make-network-stream' has always allowed :service to be specified
65 as a "number string" (i.e., :service "993") when using gethostbyname,
66 but has required using a real number (i.e., :service 993) on systems
67 without gethostbyname. This difference has now been eliminated, and
68 you can use "number strings" on all systems.
70 ** It is possible to disable attempted recovery on fatal signals
72 Two new variables allow to disable attempts to recover from stack
73 overflow and to avoid automatic auto-save when Emacs is delivered a
74 fatal signal. `attempt-stack-overflow-recovery', if set to `nil',
75 will disable attempts to recover from C stack overflows; Emacs will
76 then crash as with any other fatal signal.
77 `attempt-orderly-shutdown-on-fatal-signal', if set to `nil', will
78 disable attempts to auto-save the session and shut down in an orderly
79 fashion when Emacs receives a fatal signal; instead, Emacs will
80 terminate immediately. Both variables are non-`nil' by default.
81 These variables are for users who would like to avoid the small
82 probability of data corruption due to techniques Emacs uses to recover
86 * Editing Changes in Emacs 25.2
89 * Changes in Specialized Modes and Packages in Emacs 25.2
94 *** A new `s' command for switching to another eww buffer via the minibuffer.
97 *** The `o' command (`shr-save-contents') has moved to `O' to avoid collision
98 with the `o' command from `image-map'.
101 ** The commands that add ChangeLog entries now prefer a VCS root directory
102 for the ChangeLog file, if none already exists. Customize
103 `change-log-directory-files' to nil for the old behavior.
106 ** Support for non-string values of `time-stamp-format' has been removed.
111 *** New connection method "sg", which allows to edit files under
115 *** New connection method "doas" for OpenBSD hosts.
118 * New Modes and Packages in Emacs 25.2
121 * Incompatible Lisp Changes in Emacs 25.2
124 ** Resizing a frame no longer runs `window-configuration-change-hook'.
125 Put your function on `window-size-change-functions' instead.
128 * Lisp Changes in Emacs 25.2
130 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
132 ** Autoload files can be generated without timestamps,
133 by setting `autoload-timestamps' to nil.
134 FIXME As an experiment, nil is the current default.
135 If no insurmountable problems before next release, it can stay that way.
137 ** `ert-with-function-mocked' of 'ert-x package allows mocking of functions
141 ** New functions `window-pixel-width-before-size-change' and
142 `window-pixel-height-before-size-change' allow to detect which window
143 changed size when `window-size-change-functions' are run.
146 * Changes in Emacs 25.2 on Non-Free Operating Systems
148 ** Intercepting hotkeys on Windows 7 and later now works better.
149 The new keyboard hooking code properly grabs system hotkeys such as
150 Win-* and Alt-TAB, in a way that Emacs can get at them before the
151 system. This makes the `w32-register-hot-key' functionality work
152 again on all versions of MS-Windows starting with Windows 7. On
153 Windows NT and later you can now register any hotkey combination. (On
154 Windows 9X, the previous limitations, spelled out in the Emacs manual,
158 * Installation Changes in Emacs 25.1
161 ** Building Emacs now requires C99 or later.
164 ** Building Emacs now requires GNU make, version 3.81 or later.
167 ** New configure option --with-cairo.
168 This builds Emacs with Cairo drawing. As a side effect, it provides
169 support for built-in printing, when Emacs was built with GTK+.
170 Cairo drawing is an experimental feature in Emacs, and subject to
171 change in future releases.
174 ** New configure option --with-modules.
175 This enables support for loading dynamic modules; see below.
178 ** By default, Emacs no longer works on IRIX. We expect that Emacs
179 users are not affected by this, as SGI stopped supporting IRIX in
180 December 2013. If you are affected, please send a bug report. You
181 should be able to work around the problem either by porting the Emacs
182 undumping code to GCC under IRIX, or by configuring --with-wide-int,
183 or by sticking with Emacs 24.4.
186 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
187 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
188 since Emacs 24.4, and the other variants were undocumented and were
189 obstacles to maintenance and development. GC_MARK_STACK and its
190 related symbols have been removed from the C internals.
193 ** 'configure' now prefers gnustep-config when configuring GNUstep.
194 If gnustep-config is not available, the old heuristics are used.
197 ** 'configure' now prefers inotify to gfile for file notification,
198 unless gfile is explicitly requested via --with-file-notification='gfile'.
201 ** 'configure' detects the kqueue file notification library on *BSD
202 and Mac OS X machines.
205 ** The configure option '--with-pkg-config-prog' has been removed.
206 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
209 ** The configure option '--with-mmdf' has been removed.
210 It was no longer useful, as it relied on libraries that are no longer
211 supported, and its presence led to confusion during configuration.
212 This affects only the 'movemail' utility; Emacs itself can still
213 process MMDF-format files as before.
216 ** The configure option '--enable-silent-rules' is now the default,
217 and silent rules are now quieter. To get the old behavior where
218 'make' chatters a lot, configure with '--disable-silent-rules' or
219 build with 'make V=1'.
222 ** The configure option '--with-gameuser' now allows you to specify a
223 group instead of a user if its argument is prefixed by ':' (a colon).
224 This will cause the game score files in ${localstatedir}/games/emacs
225 to be owned by that group, and the helper program for updating them to
226 be installed setgid. The option now defaults to the 'games' group.
229 ** The `grep-changelog' script (and its manual page) are no longer included.
230 It has no particular connection to Emacs and has not changed in years,
231 so if you want to use it, you can always take a copy from an older Emacs.
234 ** Emacs 25 comes with a new set of icons.
235 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
236 The old Emacs logo icons are available as `emacs23.png' in the same location.
239 ** New make target `check-expensive' to run additional tests.
240 This includes all tests which run via "make check", plus additional
241 tests which take more time to perform.
244 * Startup Changes in Emacs 25.1
247 ** When Emacs is given a file as a command line argument and
248 `initial-buffer-choice' is non-nil, display both the file and
249 `initial-buffer-choice'. When Emacs is given more than one file and
250 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
251 and *Buffer List*. This makes Emacs convenient to use from the
252 command line when `initial-buffer-choice' is non-nil.
255 ** The value of ‘initial-scratch-message’ is now treated as a doc string
256 and can contain escape sequences for command keys, quotes, and the like.
259 * Changes in Emacs 25.1
262 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
263 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
264 xwidget support, you can access the embedded webkit browser with `M-x
265 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
266 browser. The buffer will have a new mode, `xwidget-webkit-mode'
267 (similar to `image-mode'), which supports the webkit widget.
270 *** New functions for xwidget-webkit mode `xwidget-webkit-insert-string',
271 `xwidget-webkit-adjust-size-dispatch', `xwidget-webkit-back',
272 `xwidget-webkit-browse-url', `xwidget-webkit-reload',
273 `xwidget-webkit-current-url', `xwidget-webkit-scroll-backward',
274 `xwidget-webkit-scroll-forward', `xwidget-webkit-scroll-down',
275 `xwidget-webkit-scroll-up'.
278 ** Emacs can now load shared/dynamic libraries (modules).
279 A dynamic Emacs module is a shared library that provides additional
280 functionality for use in Emacs Lisp programs, just like a package
281 written in Emacs Lisp would. The functions `load', `require',
282 `load-file', etc. were extended to load such modules, as they do with
283 Emacs Lisp packages. The new variable `module-file-suffix' holds the
284 system-dependent value of the file-name extension (`.so' on Posix
285 hosts) of the module files.
287 A module should export a C-callable function named
288 `emacs_module_init', which Emacs will call as part of the call to
289 `load' or `require' which loads the module. It should also export a
290 symbol named `plugin_is_GPL_compatible' to indicate that its code is
291 released under the GPL or compatible license; Emacs will refuse to
292 load modules that don't export such a symbol.
294 If a module needs to call Emacs functions, it should do so through the
295 API defined and documented in the header file `emacs-module.h'. Note
296 that any module that provides Lisp-callable functions will have to use
297 Emacs functions such as `fset' and `funcall', in order to register its
298 functions with the Emacs Lisp interpreter.
300 Modules can create `user-ptr' Lisp objects that embed pointers to C
301 struct's defined by the module. This is useful for keeping around
302 complex data structures created by a module, to be passed back to the
303 module's functions. User-ptr objects can also have associated
304 "finalizers" -- functions to be run when the object is GC'ed; this is
305 useful for freeing any resources allocated for the underlying data
306 structure, such as memory, open file descriptors, etc. A new
307 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
310 Loadable modules in Emacs are an experimental feature, and subject to
311 change in future releases. For that reason, their support is disabled
312 by default, and must be enabled by using the `--with-modules' option
316 ** A second dir-local file (.dir-locals-2.el) is now accepted.
317 See the variable `dir-locals-file-2' for more information.
320 ** Network security (TLS/SSL certificate validity and the like) is
321 added via the new Network Security Manager (NSM) and controlled via
322 the `network-security-level' variable.
325 ** International domain names (IDNA) are now encoded via the new
326 puny.el library, so that one can visit web sites like
327 "http://méxico.icom.museum".
330 ** C-h l now also lists the commands that were run.
332 ** The new M-s M-w key binding uses eww to search the web for the
336 ** The new `timer-list' command lists all active timers in a buffer
337 where you can cancel them with the `c' command.
339 ** M-x suggests shorthands and ignores obsolete commands for completion.
340 ** x-select-enable-clipboard is renamed select-enable-clipboard.
341 x-select-enable-primary and renamed select-enable-primary.
342 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
343 name it), with the proviso that on some systems (e.g. Windows)
344 select-enable-primary is ineffective since the system doesn't
345 have the equivalent of a primary selection.
348 ** New option `switch-to-buffer-in-dedicated-window' allows you to
349 customize how `switch-to-buffer' proceeds interactively when the
350 selected window is strongly dedicated to its buffer.
353 ** The option `even-window-heights' has been renamed to
354 `even-window-sizes' and now handles window widths as well.
357 ** New function `read-multiple-choice' use to prompt for
358 multiple-choice questions, with a handy way to display help texts.
361 ** terpri gets an optional arg ENSURE to conditionally output a newline.
364 ** `insert-register' now leaves point after the inserted text
365 when called interactively. A prefix argument toggles this behavior.
368 ** The new variable `term-file-aliases' replaces some files from lisp/term.
369 The function `tty-run-terminal-initialization' consults this variable
370 when deciding what terminal-specific initialization code to run.
373 ** New variable `system-configuration-features', listing some of the
374 main features that Emacs was compiled with. This is mainly intended
375 for use in Emacs bug reports.
378 ** A password is now hidden also when typed in batch mode. Another
379 hiding character but the default `.' can be used by let-binding the
380 variable `read-hide-char'.
383 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
386 * Editing Changes in Emacs 25.1
389 ** M-x suggests shorthands and ignores obsolete commands for completion.
394 *** Successive single-char deletions are collapsed in the undo-log just like
395 successive char insertions. Which commands invoke this behavior is
396 controlled by the new `undo-auto-amalgamate' function. See the node
397 "Undo" in the ELisp manual for more details.
400 *** The heuristic used to insert `undo-boundary' after each command
401 has changed, so that if a command causes changes in more than just the
402 current buffer, Emacs now calls `undo-boundary' in every buffer
403 affected by the command.
406 ** New command `comment-line' bound to `C-x C-;'.
408 ** New and improved facilities for inserting Unicode characters
411 *** Unicode names entered via C-x 8 RET now use substring completion by default.
414 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
415 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
418 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
419 as you type. See also the new variable ‘text-quoting-style’.
422 ** New minor mode global-eldoc-mode is enabled by default.
425 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
426 Bracketed paste mode causes text terminals to wrap pasted text in special
427 escape sequences that allow Emacs to tell the difference between text
428 you type and text you paste from other applications. Emacs then
429 avoids interpreting each character in the pasted text as it does with
430 keyboard input, which results in a paste experience similar to that
431 under a window system, and significant performance improvements when
432 pasting large amounts of text.
434 Bracketed paste mode is disabled by default, so Emacs automatically
435 enables it at startup if the terminal supports it.
438 ** Emacs now supports the latest version of the UBA.
439 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
440 was updated to support all the latest additions and changes introduced
441 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
442 This includes full support for directional isolates and the
443 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
447 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
450 ** New buffer-local `electric-pair-local-mode'.
453 ** New variable `fast-but-imprecise-scrolling' inhibits
454 fontification during full screen scrolling operations, giving less
455 hesitant operation during auto-repeat of C-v, M-v at the cost of
456 possible inaccuracies in the end position.
459 ** New documentation command `describe-symbol'.
460 Works for functions, variables, faces, etc. It is bound to `C-h o' by
464 ** New function `custom-prompt-customize-unsaved-options' checks for
465 unsaved customizations and prompts user to customize (if found). It
466 is intended for adding to 'kill-emacs-query-functions'.
469 ** The old `C-x w' bindings in hi-lock-mode are officially deprecated
470 in favor of the global `M-s h' bindings introduced in Emacs-23.1.
471 They'll disappear soon.
474 ** New bindings for 'query-replace-map'.
475 `undo', undo the last replacement; bound to `u'.
476 `undo-all', undo all replacements; bound to `U'.
479 * Changes in Specialized Modes and Packages in Emacs 25.1
484 *** New command `checkdoc-package-keywords' checks if the
485 current package keywords are recognized. Set the new option
486 `checkdoc-package-keywords-flag' to non-nil to make
487 `checkdoc-current-buffer' call this function automatically.
490 *** New function `checkdoc-file' checks for style errors.
491 It's meant for use together with `compile':
492 emacs -batch --eval "(checkdoc-file \"subr.el\")"
497 *** The desktop format version has been upgraded from 206 to 208.
498 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
499 cannot read a version 208 desktop. To upgrade your desktop file, you
500 must explicitly request the upgrade, by C-u M-x desktop-save. You are
501 recommended to do this as soon as you have firmly upgraded to Emacs
502 25.1 (or later). Should you ever need to downgrade your desktop file
503 to version 206, you can do this with C-u C-u M-x desktop-save.
506 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
507 It raises an error if a bookmark of that name already exists,
508 unlike `bookmark-set' which silently updates an existing bookmark.
513 *** New user options `mm-html-inhibit-images' and `mm-html-blocked-images'
514 now control how mm-* functions fetch and display images in an HTML
515 message. Gnus still uses `gnus-inhibit-images' and `gnus-blocked-images'
516 for that purpose, i.e., binds mm-html- variables with those gnus-
517 variables, but other packages do not have to bind gnus- variables now.
520 *** `mm-inline-text-html-with-images' has been removed.
521 Use `mm-html-inhibit-images' instead. Note that the value is opposite
527 *** `imap-ssl-program' has been removed, and imap.el uses the internal
528 GnuTLS encryption functions if possible.
533 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
534 the ordering of object keys by default.
537 *** New commands `json-pretty-print-ordered' and
538 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
539 object keys sorted alphabetically.
542 ** Prog mode has some support for multi-mode indentation.
543 This allows better indentation support in modes that support multiple
544 programming languages in the same buffer, like literate programming
545 environments or ANTLR programs with embedded Python code.
547 A major mode can provide indentation context for a sub-mode through
548 the `prog-indentation-context' variable. To support this, modes that
549 provide indentation should use `prog-widen' instead of `widen' and
550 `prog-first-column' instead of a literal zero. See the node
551 "Mode-Specific Indent" in the ELisp manual for more details.
553 ** Prettify Symbols mode
556 *** Prettify Symbols mode supports custom composition predicates. By
557 overriding the default `prettify-symbols-compose-predicate', modes can
558 specify in which contexts a symbol may be displayed as some Unicode
559 character. `prettify-symbols-default-compose-p' is the default which
560 is suitable for most programming languages such as C or Lisp (but not
564 *** Symbols can be unprettified while point is inside them.
565 New variable `prettify-symbols-unprettify-at-point' configures this.
567 ** Enhanced xterm support
570 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
571 This variable tells Emacs which advanced capabilities are available in
572 the xterm terminal emulator used to display Emacs text-mode frames.
573 The default is to check each capability, and use it if available.
574 (This variable was introduced in Emacs 24.1, but was not announced in
578 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
579 in the surrounding GUI (using the OSC-52 escape sequence). This only works
580 if your xterm supports it and enables the `allowWindowOps' options (disabled
581 by default at least in Debian, for security reasons).
583 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
584 escape sequence) if your xterm has the feature enabled but for that you
585 additionally need to add `getSelection' to `xterm-extra-capabilities'.
588 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
591 ** The `save-place' variable is replaced by `save-place-mode'.
596 *** ERC can now hide message types by network or channel.
597 `erc-hide-list' will hide all messages of the specified type, while
598 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
599 specified message types for the respective specified targets.
601 *** New variable `erc-default-port-tls' used to connect to TLS IRC
605 *** Reconnection is now asynchronous.
608 *** Nick completion is now case-insensitive again after inadvertently
609 being made case-sensitive in Emacs 24.2.
614 *** New commands, key binds, and menu items.
616 **** `<' and `>' for navigating previous and next tracks in playlist
618 **** New play/pause command `mpc-toggle-play' bound to `s'
620 **** `g' bound to new command `mpc-seek-current' will navigate current
623 **** New commands `mpc-toggle-{consume,repeat,single,shuffle}' for
624 toggling playback modes.
627 *** Now supports connecting to a UNIX domain socket.
630 *** Looks at more image file names to use as album art.
631 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
632 (XP) in addition to cover.jpg.
635 *** Searches in more locations for MPD configuration files.
636 MPD supports the XDG base directory specification since version 0.17.6.
641 *** `midnight-mode' is now a proper minor mode.
644 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
649 *** New "external" package status.
650 An external package is any installed package that's not built-in and
651 not from `package-user-dir', which usually means it's from an entry in
652 `package-directory-list'. They are treated much like built-in
653 packages, in that they cannot be deleted through the package menu and
654 are not considered for upgrades.
656 The effect is that a user can manually place a specific version of a
657 package inside `package-directory-list' and the package menu will
661 *** If a package is available on multiple archives and one has higher
662 priority (as per `package-archive-priorities') only that one is
663 listed. This can be configured with `package-menu-hide-low-priority'.
666 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
667 This includes the above-mentioned low-priority packages, as well as
668 available packages whose version is lower than the currently installed
669 version (which were previously impossible to display).
670 This allows users to downgrade a package if a lower version is
674 *** When filtering the package menu, keywords starting with "arc:" or
675 "status:" represent package archive or status, respectively, instead
679 *** Most functions which involve downloading information now take an
680 ASYNC argument. If it is non-nil, package.el performs the download(s)
684 *** New variable `package-menu-async' controls whether the
685 package-menu uses asynchronous downloads.
688 *** `package-install-from-buffer' and `package-install-file' work on directories.
689 This follows the same rules as installing from a .tar file, except the
690 -pkg file is optional.
693 *** Packages which are dependencies of other packages cannot be deleted.
694 The FORCE argument to `package-delete' overrides this.
697 *** New custom variable `package-selected-packages' tracks packages
698 which were installed by the user (as opposed to installed as
699 dependencies). This variable can also be manually customized.
702 *** New command `package-install-selected-packages' installs all
703 packages from `package-selected-packages' which are currently missing.
706 *** New command `package-autoremove' removes all packages which were
707 installed strictly as dependencies but are no longer needed.
712 When you invoke `shell' interactively, the *shell* buffer will now
713 display in a new window. However, you can customize this behavior via
714 the `display-buffer-alist' variable. For example, to get
715 the old behavior -- *shell* buffer displays in current window -- use
716 (add-to-list 'display-buffer-alist
717 '("^\\*shell\\*$" . (display-buffer-same-window))).
721 *** The `:protection' slot option is not obeyed any more.
723 *** The `newname' argument to constructors is optional&deprecated.
724 If you need your objects to be named, do it by inheriting from `eieio-named'.
726 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
728 *** The <class> variables are declared obsolete.
730 *** The <initarg> variables are declared obsolete.
732 *** defgeneric and defmethod are declared obsolete.
733 Use the equivalent facilities from cl-generic.el instead.
735 *** `constructor' is now an obsolete alias for `make-instance'.
736 --- `pcase' accepts a new UPattern `eieio'.
741 *** New command `ido-bury-buffer-at-head' bound to C-S-b
742 Bury the buffer at the head of `ido-matches', analogous to how C-k
743 kills the buffer at head.
746 *** A prefix argument to `ido-restrict-to-matches' will reverse its
747 meaning, and the list is restricted to those elements that do not
748 match the current input.
753 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
754 The new commands `next-line-or-history-element' and
755 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
756 minibuffer, allow by-line movement through minibuffer history,
757 similarly to an ordinary buffer. Only when point moves over
758 the bottom/top of the minibuffer it goes to the next/previous history
759 element. `M-p' and `M-n' still move directly to previous/next history
762 ** Search and Replace
765 *** `isearch' and `query-replace' can now perform character folding in matches.
766 Isearch does that by default, while `query-replace' will do that if
767 the new variable `replace-character-fold' is customized to a non-nil
768 value. This is analogous to case folding, but instead of disregarding
769 case variants, it disregards wider classes of distinctions between
770 similar characters. (Case folding is a special case of character
771 folding.) This means many characters in the search string will match
772 entire groups of characters instead of just themselves.
774 For instance, the " will match all variants of double quotes (like “
775 and ”), and the letter a will match all of its accented cousins, even
776 those composed of multiple characters, as well as many other symbols
779 Character folding is enabled by customizing `search-default-mode' to
780 the value `character-fold-to-regexp'. If you want to turn character
781 folding off, customize the value of `search-default-mode' to the `nil'
782 value. You can also toggle character folding in the middle of a
783 search by typing `M-s ''.
786 *** New user option `search-default-mode'.
787 This option specifies the default mode for Isearch. The default
788 value, `character-fold-to-regexp' specifies that Isearch should fold
789 characters when searching.
792 *** New function `character-fold-to-regexp' can be used
793 by searching commands to produce a regexp matching anything that
794 character-folds into STRING.
797 *** The new M-s M-w key binding uses eww to search the web for the
798 text in the region. The search engine to use for this is specified by
799 the customizable variable `eww-search-prefix'.
802 *** Query-replace history is enhanced.
803 When query-replace reads the FROM string from the minibuffer, typing
804 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
805 and TO are the original text and its replacement, and SEP is an arrow
806 string defined by the new variable `query-replace-from-to-separator'.
807 To select a prior replacement, type `M-p' until the desired
808 replacement appears in the minibuffer, and then exit the minibuffer by
813 *** If `quick-calc' is called with a prefix argument, insert the
814 result of the calculation into the current buffer.
817 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
818 this you can tell Edebug not to stop at the start of the first
819 instrumented function.
824 *** New minor mode `global-eldoc-mode'
825 It is turned on by default, and affects `*scratch*' and other buffers
826 whose major mode supports Emacs Lisp.
829 *** `eldoc-documentation-function' now defaults to `ignore'
832 *** `describe-char-eldoc' displays information about character at point,
833 and can be used as a default value of `eldoc-documentation-function'. It is
834 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
835 ] [, ] [, etc.) while using mono-spaced font.
840 *** HTML can now be rendered using variable-width fonts.
843 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
844 whether to use variable-pitch fonts or not. The user can also
845 customize the `shr-use-fonts' variable.
848 *** A new command `C' (`eww-toggle-colors') can be used to toggle
849 whether to use the HTML-specified colors or not. The user can also
850 customize the `shr-use-colors' variable.
853 *** A new command `R' (`eww-readable') will try do identify the main
854 textual parts of a web page and display only that, leaving menus and
855 the like off the page.
858 *** Images that are being loaded are now marked with grey
859 "placeholder" images of the size specified by the HTML. They are then
860 replaced by the real images asynchronously, which will also now
861 respect width/height HTML specs (unless they specify widths/heights
862 bigger than the current window).
865 *** You can now use several eww buffers in parallel by renaming eww
866 buffers you want to keep separate.
869 *** Partial state of the eww buffers (the URIs and the titles of the
870 pages visited) is now preserved in the desktop file.
873 *** `eww-after-render-hook' is now called after eww has rendered
874 the data in the buffer.
877 *** The `eww-reload' command now takes a prefix to not reload via
878 the net, but just use the local copy of the HTML.
881 *** The DOM shr and eww uses has been changed to the general Emacs
882 xml.el/libxml2 DOM, and a new package dom.el has been added to
883 interact with this DOM. See the Emacs Lisp manual for interface
887 *** `mailcap-mime-data' is now consulted when displaying PDF files.
890 *** The new `S' command will list all eww buffers, and allow managing
894 *** https pages with valid certificates have headers marked in green, while
895 invalid certificates are marked in red.
900 *** text/html messages that contain inline image parts will be
901 transformed into multipart/related messages before sending.
904 *** The `message-valid-fqdn-regexp' variable has been removed, since
905 there are now top-level domains added all the time. Message will no
906 longer warn about sending emails to top-level domains it hasn't heard
909 *** `message-beginning-of-line' (bound to C-a) understands folded headers.
910 In `visual-line-mode' it will look for the true beginning of a header
911 while in non-`visual-line-mode' it will move the point to the indented
915 ** In Show Paren Mode, a parenthesis can be highlighted when point
916 stands inside it, and certain parens can be highlighted when point is
917 at BOL or EOL, or in whitespace there. To enable these, customize,
918 respectively, `show-paren-when-point-inside-paren' or
919 `show-paren-when-point-in-periphery'.
922 ** If gpg2 exists on the system, it is now used as the default value
923 of `epg-gpg-program' (instead of gpg).
928 *** Images are automatically scaled before displaying based on the
929 `image-scaling-factor' variable (if Emacs supports scaling the images
933 *** Images inserted with `insert-image' and related functions get a
934 keymap put into the text properties (or overlays) that span the
935 image. This keymap binds keystrokes for manipulating size and
936 rotation, as well as saving the image to a file. These commands are
937 also available in `image-mode'.
940 *** A new library for creating and manipulating SVG images has been
941 added. See the "SVG Images" section in the lispref manual for
945 *** New setf-able function to access and set image parameters is
946 provided: `image-property'.
952 *** Strings after `:documentation' are highlighted as docstrings.
953 This enhances Lisp mode fontification to handle documentation of the
954 form `(:documentation "the doc string")' used in Common Lisp code for
955 CLOS class and slot documentation.
960 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
963 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
964 *** `string-rectangle' provides on-the-fly preview of the result.
967 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
968 These should be used in preference to `font-lock-fontify-buffer' when
972 ** Macro `minibuffer-with-setup-hook' can optionally append a function
973 to `minibuffer-setup-hook'.
975 If the first argument of the macro is of the form `(:append FUN)',
976 then FUN will be appended to `minibuffer-setup-hook', instead of
981 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
984 *** `pcase' accepts the new UPattern `cl-struct'.
986 ** Calendar and diary
989 *** The default `diary-file' is now located in .emacs.d.
992 *** New commands to insert diary entries with Chinese dates:
993 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
994 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
997 *** The calendar can now list and mark diary entries with Chinese dates.
998 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
1001 *** The option `calendar-mode-line-format' can now be nil,
1002 which means to do nothing special with the mode line in calendars.
1005 *** New option `calendar-weekend-days'.
1006 The option customizes which day headers receive the
1007 `calendar-weekend-header' face.
1010 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
1013 *** Many items obsolete since at least version 23.1 have been removed.
1014 The majority were function/variable/face aliases, too numerous to list here.
1017 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
1018 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
1020 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
1022 **** Macro `calendar-for-loop'.
1024 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
1026 **** The nil and list forms of `diary-display-function'.
1029 ** New ERT function `ert-summarize-tests-batch-and-exit'.
1030 If the output of ERT tests in batch mode execution can be saved to a
1031 log file, then it can be passed as an argument to the above function
1032 to produce a neat summary.
1035 ** New js.el option `js-indent-first-init'.
1036 It was renamed from `js-indent-first-initialiser', to avoid issues
1037 with American vs British spelling.
1042 ** Info mode now displays symbol names in fixed-pitch font.
1043 If you want to get the old behavior back, customize the `Info-quoted'
1044 face to use the same definitions as the default face.
1047 *** `Info-fontify-maximum-menu-size' can be t for no limit.
1050 *** `info-display-manual' can now be given a prefix argument which (any
1051 non-nil value) directs the command to limit the completion
1052 alternatives to currently visited manuals.
1055 ** ntlm.el has support for NTLM2.
1060 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
1061 to delete or undelete multiple messages.
1064 *** Rmail can now render HTML mail messages if your Emacs was built with
1065 libxml2 or if you have the Lynx browser installed. By default, Rmail
1066 will display the HTML version of a mail message that has both HTML and
1067 plain text parts, if display of HTML email is possible; customize the
1068 `rmail-mime-prefer-html' option to `nil' if you don't want that.
1071 *** In the commands that make summaries by subject, recipients, or senders,
1072 you can no longer use commas to separate regular expressions.
1075 ** SES now supports local printer functions; see `ses-define-local-printer'.
1077 ** Shell-script Mode
1079 *** In sh-mode you can now use `sh-shell' as a file-local variable to
1080 specify the type of shell in use (bash, csh, etc).
1083 *** New value `always' for `sh-indent-after-continuation'.
1084 This provides old-style ("dumb") indentation of continued lines.
1085 See the doc string of `sh-indent-after-continuation' for details.
1089 *** Fatal TLS errors are now silent by default.
1092 *** If Emacs isn't built with TLS support, an external TLS-capable
1093 program is used instead. This program used to be run in --insecure
1094 mode by default, but has now changed to be secure instead, and will
1095 fail if you try to connect to non-verifiable hosts. This is
1096 controlled by the `tls-program' variable.
1101 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1102 When `url-handler-mode' is enabled, file operations for these
1103 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1106 *** The URL package allows customizing the `url-user-agent' string.
1107 The new `url-user-agent' variable can be customized to be a string or
1111 *** The new interface variable `url-request-noninteractive' can be used
1112 to specify that we're running in a noninteractive context, and that
1113 we should not be queried about things like TLS certificate validity.
1116 *** `url-mime-accept-string' can now be used as in "interface"
1117 variable, meaning you can bind it around an `url-retrieve' call.
1120 *** If URL is used with a https connection, the first callback argument
1121 plist will contain a :peer element that has the output of
1122 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
1125 *** The new function `url-cookie-delete-cookie' can be used to
1126 programmatically delete all cookies, or cookies from a specific
1132 *** New connection method "afp", which allows you to access Mac OS X
1133 volumes via the Apple Filing Protocol.
1136 *** New connection method "nc", which allows you to access dumb
1140 *** Method-specific parameters can be overwritten now with variable
1141 `tramp-connection-properties'.
1144 *** Handler for `file-notify-valid-p' for remote machines that support
1145 filesystem notifications.
1150 *** New user variable `sql-default-directory' enables remote
1151 connections using Tramp.
1154 *** New command `sql-send-line-and-next'.
1155 This command, bound to `C-c C-n' by default, sends the current line to
1156 the SQL process and advances to the next line, skipping whitespace and
1160 *** Added support for Vertica SQL.
1162 ** VC and related modes
1165 *** Basic push support, via `vc-push', bound to `C-x v P'.
1166 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1167 (undocumented) command vc-hg-push now behaves slightly differently.
1170 *** The new command vc-region-history shows the log+diff of the active region.
1173 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
1174 This command is useful when you perform version control commands
1175 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1176 back-end for the buffer's file, or remove it from version control.
1179 *** The VC state indicator in the mode line now defaults to more
1180 colorful faces to make it more obvious to the user what the state is.
1181 See the `vc-faces' customization group.
1184 *** New option `vc-annotate-background-mode' controls whether
1185 the color range from `vc-annotate-color-map' is applied to the
1186 background or to the foreground.
1189 *** `compare-windows' now compares text with the most recently selected window
1190 instead of the next window. If you want the previous behavior of
1191 comparing with the next window, customize the new option
1192 `compare-windows-get-window-function' to the value
1193 `compare-windows-get-next-window'.
1196 *** Two new faces `compare-windows-removed' and `compare-windows-added'
1197 replace the face `compare-windows', which is now an obsolete alias for
1198 `compare-windows-added'.
1201 *** The VC state indicator in the mode line now has different faces
1202 corresponding to each of the possible states. See the `vc-faces'
1203 customization group.
1206 *** `log-edit-insert-changelog' converts "(tiny change)" to
1207 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
1208 nil to disable this.
1211 ** VHDL mode now supports VHDL'08.
1216 *** Decimal display mode uses "," groups, so it's more
1217 fitting for use in money calculations
1220 *** Factorial works with non-integer inputs.
1225 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1226 macro argument expansion, interactive macro evaluation and automatic
1227 scanning of #define'd symbols.
1230 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
1231 result of evaluating a macro.
1234 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
1235 all defined symbols in `hide-ifdef-env'.
1238 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
1239 file name patterns. Defaults to files whose extension is one of `.h',
1240 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
1243 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
1244 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1245 (This could happen when an idempotent header file is visited again,
1246 when its guard symbol is already defined.) Defaults to `t'.
1249 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
1250 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1251 looking for macro definitions. By default, no symbols are ignored.
1256 *** New custom variable `tex-print-file-extension' to help users who
1257 use PDF instead of DVI.
1260 *** TeX mode now supports Prettify Symbols mode. When enabling
1261 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1262 many other math macros are displayed using unicode characters.
1265 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
1266 By default, 32 consecutive spaces or four consecutive TABs are
1267 considered to be too deep, but the new variable
1268 `whitespace-big-indent-regexp' can be customized to change that.
1271 ** New options in `tildify-mode'.
1272 New options `tildify-space-string', `tildify-pattern', and
1273 `tildify-foreach-region-function' variables make
1274 `tildify-string-alist', `tildify-pattern-alist', and
1275 `tildify-ignored-environments-alist' variables (as well as a few
1276 helper functions) obsolete.
1279 ** New package Xref replaces Etags's front-end and UI
1281 The new package Xref provides a generic framework and new commands to
1282 find and move to definitions of functions, macros, data structures
1283 etc., as well as go back to the location where you were before moving
1284 to a definition. It supersedes and obsoletes many Etags commands,
1285 while still using the etags.el code that reads the TAGS tables as one
1288 The command `xref-find-definitions' replaces `find-tag' and provides
1289 an interface to pick one definition among several.
1290 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
1291 `pop-tag-mark', but has a keybinding (`M-,') different from the one
1292 `pop-tag-mark' used.
1294 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
1295 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1296 `xref-find-apropos' replaces `find-tag-regexp'.
1298 As a result of this, the following commands are now obsolete:
1299 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1302 `tags-loop-continue' is not obsolete because it's still useful in
1303 `tags-search' and `tags-query-replace', for which there are no direct
1307 *** Variants of `tags-search' and `tags-query-replace' in Dired were also
1308 replaced by xref-style commands, see the "Dired" section below.
1313 `find-tag-marker-ring-length' is now an obsolete alias for
1314 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1315 alias for a private variable. `xref-push-marker-stack' and
1316 `xref-pop-marker-stack' should be used instead to manipulate the stack
1317 of searches for definitions.
1320 *** `xref-find-definitions' and `describe-function' now display
1321 information about mode local overrides (defined by cedet/mode-local.el
1322 `define-overloadable-function' `define-mode-local-overrides').
1324 The framework's Lisp API is still experimental and can change in major,
1325 backward-incompatible ways.
1328 ** New package Project
1330 The new package Project provides generic infrastructure for dealing
1331 with projects. The main commands included in it are
1332 `project-find-file' and `project-find-regexp'.
1334 The Lisp API of this package is still experimental.
1337 EUDC's LDAP backend has been improved.
1340 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1343 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1344 subprocess instead of on the command line.
1347 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1348 need to configure this manually anymore.
1351 *** The LDAP configuration section of EUDC's manual has been
1354 There have also been customization changes.
1357 *** New custom variable `eudc-server-hotlist' to allow specifying
1358 multiple EUDC servers in init file.
1361 *** Custom variable `eudc-inline-query-format' defaults to completing
1362 on email and firstname instead of surname.
1365 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1366 to avoid interfering with the kill ring.
1369 *** Custom variable `eudc-inline-expansion-format' defaults to
1370 "Firstname Surname <mail-address>".
1373 *** Custom variable `eudc-options-file' defaults to
1374 "~/.emacs.d/eudc-options".
1377 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1378 allow overriding the regular expression that recognizes the ldapsearch
1379 command line's password prompt.
1382 EUDC's BBDB backend now supports BBDB 3.
1385 EUDC's PH backend (eudcb-ph.el) is obsolete.
1390 *** The new built-in command `clear' can scroll window contents out of sight.
1391 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1394 *** New buffer syntax '#<buffer-name>', which is equivalent to
1395 '#<buffer buffer-name>'. This shorthand makes interacting with
1396 buffers from eshell more convenient. Custom variable
1397 `eshell-buffer-shorthand', which has been broken for a while, has been
1401 *** By default, eshell "visual" program buffers (created by
1402 `eshell-visual-commands' and similar custom vars) are no longer killed
1403 when their processes die. This fixes issues with short-lived commands
1404 and makes visual programs more useful in general. For example, if
1405 "git log" is a visual command, it will always show the visual command
1406 buffer, even if the "git log" process dies. For the old behavior,
1407 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1412 *** Support for the Google Chrome web browser.
1415 *** Support for the Conkeror web browser.
1418 *** Support for several ancient browsers is now officially obsolete.
1421 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1422 be added to the archive.
1425 ** Autorevert: dired buffers are also auto-reverted via file
1426 notifications, if Emacs is compiled with file notification support.
1428 ** File Notifications
1431 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1434 *** The new event `stopped' signals, that a file notification watch is
1435 not active any longer.
1438 *** The new function `file-notify-valid-p' checks, whether a file
1439 notification descriptor still corresponds to an activate watch.
1444 *** The command `dired-do-compress' bound to `Z' now can compress
1445 directories and decompress zip files.
1448 *** New command `dired-do-compress-to' bound to `c' can be used to
1449 compress many marked files into a single named archive. The
1450 compression command is determined from the new
1451 `dired-compress-files-alist' variable.
1454 *** In wdired, when editing files to contain slash characters,
1455 the resulting directories are automatically created. Whether
1456 to do this or not is controlled by the
1457 `wdired-create-parent-directories' variable.
1460 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1461 viewing HTML files and the like.
1463 *** New user interface for the `A' and `Q' commands.
1464 These keys, now bound to `dired-do-find-regexp' and
1465 `dired-do-find-regexp-and-replace', work similarly to `xref-find-apropos'
1466 and `xref-query-replace-in-results': they present the matches
1467 in the `*xref*' buffer and let you move through the matches. No need
1468 to use `tags-loop-continue' to resume the search or replace loop. The
1469 previous commands, `dired-do-search' and
1470 `dired-do-query-replace-regexp', are still available, but not bound to
1471 keys; rebind `A' and `Q' to invoke them if you want the old behavior
1472 back. We intend to obsolete the old commands in a future release.
1474 ** Tabulated List Mode
1477 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1478 call `tabulated-list-init-header', in which case it will have no
1482 *** `tabulated-list-print' takes a second optional argument, update,
1483 which specifies an alternative printing method which is faster when
1484 few or no entries have changed.
1486 ** Obsolete packages
1492 *** landmark.el (moved to elpa.gnu.org)
1495 * New Modes and Packages in Emacs 25.1
1498 ** pinentry.el allows GnuPG passphrase to be prompted through the
1499 minibuffer instead of a graphical dialog, depending on whether the gpg
1500 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1501 is set). This feature requires newer versions of GnuPG (2.1.5 or
1502 later) and Pinentry (0.9.5 or later). To use this feature, add
1503 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1504 configuration with "gpgconf --reload gpg-agent".
1507 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1508 The main entry points are `cl-defgeneric' and `cl-defmethod'. See the
1509 node "Generic Functions" in the Emacs Lisp manual for more details.
1512 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1513 SCSS (Sassy CSS) files.
1516 ** let-alist is a new macro (and a package) that allows one to easily
1517 let-bind the values stored in an alist.
1520 ** `tildify-mode' allows automatic insertion of hard spaces as one
1521 types the text. Breaking line after a single-character words is
1522 forbidden by Czech and Polish typography (and may be discouraged in
1523 other languages), so `auto-tildify-mode' makes it easier to create
1524 a typographically-correct documents.
1527 ** The `seq' library adds sequence manipulation functions and macros
1528 that complement basic functions provided by subr.el. All functions
1529 are prefixed with `seq-' and work on lists, strings and vectors.
1530 `pcase' accepts a new Upattern `seq'.
1533 ** The `map' library provides map-manipulation functions that work on
1534 alists, hash-table and arrays. All functions are prefixed with
1535 `map-'. `pcase' accepts a new UPattern `map'.
1538 ** The `thunk' library provides functions and macros to control the
1539 evaluation of forms.
1542 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1543 support for JSX, an XML-like syntax extension to ECMAScript.
1546 * Incompatible Lisp Changes in Emacs 25.1
1549 ** `setq' and `setf' must now be called with an even number of
1550 arguments. The earlier behavior of silently supplying a nil to the
1551 last variable when there was an odd number of arguments has been
1555 ** `syntax-begin-function' is declared obsolete.
1556 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1557 slot in font-lock-defaults.
1560 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1561 called during startup. Users who call this function in their init
1562 file and still expect it to be run after startup should set
1563 `package-enable-at-startup' to t after the call to
1564 `package-initialize'.
1567 ** `:global' minor mode use `setq-default' rather than `setq'.
1568 This means that you can't use `make-local-variable' and expect them to
1569 "magically" become buffer-local.
1572 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1573 The `track-mouse' form no longer refrains from changing the shape of
1574 the mouse pointer for the entire time the body of that form is
1575 executed. Lisp programs that use `track-mouse' for dragging across
1576 large portions of the Emacs display, and want to avoid changes in the
1577 pointer shape during dragging, should bind the variable `track-mouse'
1578 to the special value `dragging' in the body of the form.
1581 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1582 has any effect. (This change was made in Emacs 24.4 but was not
1583 advertised at the time.)
1586 ** `indirect-function' does not signal `void-function' any more.
1587 This is mostly a bug-fix, since this change was missed back in 24.4 when
1588 symbol-function was changed not to signal `void-function' any more.
1591 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1594 ** Comint, term, and compile do not set the EMACS env var any more.
1595 Use the INSIDE_EMACS environment variable instead.
1597 ** `C-up', `C-down', `C-left' and `C-right' are now defined in term
1598 mode to send the same escape sequences that xterm does. This makes
1599 things like forward-word in readline work.
1602 ** hideshow mode got four key bindings that are analogous to outline
1603 mode bindings: `C-c @ C-a', `C-c @ C-t', `C-c @ C-d', and `C-c @ C-e.'
1606 ** `save-excursion' does not save&restore the mark any more.
1607 Use `save-mark-and-excursion' if you want the old behavior.
1610 ** `read-buffer' and `read-buffer-function' can now be called with a 4th
1611 argument (`predicate').
1614 ** `completion-table-dynamic' by default stays in the minibuffer.
1615 The minibuffer will be the current buffer when the function is called.
1616 If you want the old behavior of calling the function in the buffer
1617 from which the minibuffer was entered, use the new argument
1618 `switch-buffer' to `completion-table-dynamic'.
1621 ** window-configurations no longer record the buffers' marks.
1624 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1625 active region handling.
1628 ** deactivate-mark is now buffer-local.
1631 ** `cl-the' now asserts that its argument is of the given type.
1634 ** `process-running-child-p' may now return a numeric process
1635 group ID instead of `t'.
1638 ** Mouse click events on mode line or header line no longer include
1639 any reference to a buffer position. The 6th member of the mouse
1640 position list returned for such events is now nil.
1643 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1644 These slots used to hold key-shortcut data, but have been obsolete since
1648 ** Emacs no longer downcases the first letter of a system diagnostic
1649 when signaling a file error. For example, it now reports "Permission
1650 denied" instead of "permission denied". The old behavior was problematic
1651 in languages like German where downcasing rules depend on grammar.
1654 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1655 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1656 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1657 and apostrophe `like this'. The default value nil acts like ‘curve’
1658 if curved single quotes are displayable, and like ‘grave’ otherwise.
1659 The new variable affects display of diagnostics and help, but not of info.
1662 ** substitute-command-keys now replaces quotes.
1663 That is, it converts documentation strings’ quoting style as per the
1664 value of ‘text-quoting-style’. Doc strings in source code can use
1665 either curved single quotes or grave accents and apostrophes. As
1666 before, characters preceded by \= are output as-is.
1669 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1670 They use the new ‘format-message’ function instead of plain ‘format’,
1671 so that they now follow user preference as per ‘text-quoting-style’
1672 when processing curved single quotes, grave accents, and apostrophes
1673 in their format argument.
1676 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1677 now match multibyte characters using Unicode character properties.
1678 If you want the old behavior where they matched any character with
1679 word syntax, use `\sw' instead.
1682 ** The character classes [:graph:] and [:print:] in regular expressions
1683 no longer match every multibyte character. Instead, Emacs now
1684 consults the Unicode character properties to determine which
1685 characters are graphic or printable. In particular, surrogates and
1686 unassigned codepoints are now rejected. If you want the old behavior,
1687 use [:multibyte:] instead.
1690 ** The `diff' command uses the unified format now. To restore the old
1691 behavior, set `diff-switches' to `-c'.
1694 ** `grep-template' and `grep-find-template' values don't include the
1695 --color argument anymore. It's added at the <C> place holder position
1696 dynamically. Any third-party code that changes these templates should
1697 be updated accordingly.
1699 ** The grep/rgrep/lgrep functions will now ask about saving files
1700 before running. This is controlled by the `grep-save-buffers'
1704 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1705 The new behavior is compatible with Common Lisp and with XEmacs.
1706 This change does not affect Lisp code intended to be portable to
1707 Emacs 24.2 and earlier, which did not support unary ‘/’.
1710 ** The `default-directory' value doesn't have to end slash. To make
1711 that happen, `unhandled-file-name-directory' now defaults to calling
1712 `file-name-as-directory'.
1715 * Lisp Changes in Emacs 25.1
1719 *** New UPatterns `quote', `app'.
1721 *** New UPatterns can be defined with `pcase-defmacro'.
1723 *** New vector QPattern.
1726 ** syntax-propertize is now automatically called on-demand during forward
1727 parsing functions like `forward-sexp'.
1730 ** New hooks `prefix-command-echo-keystrokes-functions' and
1731 `prefix-command-preserve-state-hook' allow the definition of prefix
1732 commands other than the predefined `C-u'.
1735 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1736 These allow conversion between buffer positions and the corresponding
1737 file byte offsets, given the file's encoding.
1740 ** The default value of `load-read-function' is now `read'.
1741 Previously, the default value of `nil' implied using `read'.
1744 ** New hook `pre-redisplay-functions'.
1745 It is a bit easier to use than `pre-redisplay-function'.
1748 ** The second arg of `looking-back' should always be provided explicitly.
1749 Previously, it was an optional argument, now it's mandatory.
1752 ** Text properties `intangible', `point-entered', and `point-left' are obsolete.
1753 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1754 implemented by the new `cursor-intangible-mode' and
1755 `cursor-sensor-mode' minor modes.
1758 ** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
1759 Use the new minor modes `cursor-intangible-mode' and
1760 `cursor-sensor-mode' instead.
1763 ** New process type `pipe', which can be used in combination with the
1764 `:stderr' keyword of make-process to handle standard error output
1768 ** New function `make-process' provides an alternative interface to
1769 `start-process'. It allows programs to set process parameters such as
1770 process filter, sentinel, etc., through keyword arguments (similar to
1771 `make-network-process').
1774 ** A new function `directory-files-recursively' returns all matching
1775 files (recursively) under a directory.
1778 ** New variable `inhibit-message', when bound to non-nil, inhibits
1779 `message' and related functions from displaying messages in the echo
1780 area. The output is still logged to the *Messages* buffer.
1783 ** A new text property `inhibit-read-only' can be used in read-only
1784 buffers to allow certain parts of the text to be writable.
1787 ** A new variable `comment-end-can-be-escaped' is useful in languages
1788 such as C and C++ where line comments with escaped newlines are
1789 continued to the next line.
1792 ** New macro `define-advice'.
1795 ** Emacs Lisp now supports generators.
1796 See the "Generators" section of the ELisp manual for the details.
1799 ** New finalizer facility for running code when objects become unreachable.
1800 See the "Finalizer Type" subsection in the ELisp manual for the
1804 ** lexical closures can use (:documentation FORM) to build their docstring.
1805 It should be placed right where the docstring would be, and FORM is then
1806 evaluated (and should return a string) when the closure is built.
1809 ** The new command `fortune-message' has been added, which displays
1810 fortunes in the echo area.
1813 ** define-inline provides a new way to define inlinable functions.
1816 ** New function `macroexpand-1' to perform a single step of macro expansion.
1819 ** Some "x-*" functions were obsoleted and/or renamed:
1820 *** x-select-text is renamed gui-select-text.
1821 *** x-selection-value is renamed gui-selection-value.
1822 *** x-get-selection is renamed gui-get-selection.
1823 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1824 *** x-get-selection-value is renamed to gui-get-primary-selection.
1825 *** x-set-selection is renamed to gui-set-selection
1828 ** New function `string-greaterp', which return the opposite result of
1832 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1833 preserve the collation order as defined by the system's locale(1)
1834 environment. For the time being this is implemented for modern POSIX
1835 systems and for MS-Windows, for other systems they fall back to their
1836 counterparts `string-lessp' and `string-equal'.
1839 ** The new function `string-version-lessp' compares strings by
1840 interpreting consecutive runs of numerical characters as numbers, and
1841 compares their numerical values. According to this predicate,
1842 "foo2.png" is smaller than "foo12.png".
1845 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1846 The effect is that, on systems that use ls-lisp for Dired, the default
1847 sort order of the files in Dired is now different from what it was in
1848 previous versions of Emacs. In particular, the file names are sorted
1849 disregarding punctuation, accents, and diacritics, and letter case is
1850 ignored. For example, files whose name begin with a period will no
1851 longer appear near the beginning of the directory listing. If you
1852 want the old, locale-independent sorting, customize the new option
1853 `ls-lisp-use-string-collate' to the nil value.
1856 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1857 if set to a non-nil value, causes the above 2 functions to ignore
1858 symbol and punctuation characters when collating strings. This
1859 emulates the behavior of modern Posix platforms when the locale's
1860 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1861 MS-Windows doesn't support UTF-8 as codeset in its locales.
1864 ** New function `alist-get', which is also a valid place (aka lvalue).
1867 ** New function `funcall-interactively', which works like `funcall'
1868 but makes `called-interactively-p' treat the function as (you guessed it)
1869 called interactively.
1872 ** New function `function-put' to use instead of `put' for function properties.
1875 ** The new function `bidi-find-overridden-directionality' allows you to
1876 find characters whose directionality was, perhaps maliciously,
1877 overridden by directional override control characters. Lisp programs
1878 can use this to detect potential phishing of URLs and other links that
1879 exploits bidirectional display reordering.
1882 ** The new function `buffer-substring-with-bidi-context' allows you to
1883 copy a portion of a buffer into a different location while preserving
1884 the visual appearance both of the copied text and the text at
1885 destination, even when the copied text includes mixed bidirectional
1886 text and directional control characters.
1889 ** New properties that can be specified with `declare':
1890 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1891 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1892 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1896 ** New macro `with-file-modes', for evaluating expressions with default file
1897 permissions set to temporary values (e.g., for creating private files).
1900 ** You can access the slots of structures using `cl-struct-slot-value'.
1903 ** Function `sort' can deal with vectors.
1906 ** Function `system-name' now returns an updated value if the current
1907 system's name has changed or if the Emacs process has changed systems,
1908 and to avoid long waits it no longer consults DNS to canonicalize the
1909 name. The variable `system-name' is now obsolete.
1912 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1915 ** If `pwd' is called with a prefix argument, insert the current default
1919 ** New functions return extended information about fonts and faces.
1922 *** The function `font-info' now returns more details about a font.
1923 In particular, it now returns the average width of the font's
1924 characters, which can be used for geometry-related calculations.
1927 *** A new function `default-font-width' returns the average width of a
1928 character in the current buffer's default font. If the default face
1929 is remapped (see `face-remapping-alist'), the value for the remapped
1930 face is returned. This function complements the existing function
1931 `default-font-height'.
1934 *** New functions `window-font-height' and `window-font-width' return
1935 the height and average width of characters in a specified face and
1936 window. If FACE is remapped (see `face-remapping-alist'), the
1937 function returns the information for the remapped face.
1940 *** A new function `window-max-chars-per-line' returns the maximal
1941 number of characters that can be displayed on one line. If a face
1942 and/or window are provided, these values are used for the
1943 calculation. This function is different from `window-body-width' in
1944 that it accounts for (i) continuation glyphs, (ii) the size of the
1945 font, and (iii) the specified window.
1948 ** New utilities in subr-x.el:
1949 *** New macros `if-let' and `when-let' allow defining bindings and to
1950 execute code depending whether all values are true.
1951 *** New macros `thread-first' and `thread-last' allow threading a form
1952 as the first or last argument of subsequent forms.
1955 ** Documentation strings now support quoting with curved single quotes
1956 ‘like-this’ in addition to the old style with grave accent and
1957 apostrophe `like-this'. The new style looks better on today's displays.
1958 In the new Electric Quote mode, you can enter curved single quotes
1959 into documentation by typing ` and '. Outside Electric Quote mode,
1960 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1961 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1962 ‘text-quoting-style’, the user can specify how to display doc string
1966 ** New function ‘format-message’ is like ‘format’ and also converts
1967 curved single quotes, grave accents and apostrophes as per
1968 ‘text-quoting-style’.
1971 ** show-help-function's arg is converted via substitute-command-keys
1972 before being passed to the function. Help strings, help-echo
1973 properties, etc. can therefore contain command key escapes and
1977 ** Time-related changes:
1979 *** Time conversion functions now accept an optional ZONE argument
1980 that specifies the time zone rules for conversion. ZONE is omitted or
1981 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1982 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1983 rule. The affected functions are ‘current-time-string’,
1984 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1985 function ‘encode-time’, which already accepted a simple time zone rule
1986 argument, has been extended to accept all the new forms.
1988 *** Time-related functions now consistently accept numbers
1989 (representing seconds since the epoch) and nil (representing the
1990 current time) as well as the usual list-of-integer representation.
1991 Affected functions include `current-time-string', `current-time-zone',
1992 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1993 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1994 `time-to-days', and `time-to-seconds'.
1996 *** The `encode-time-value' and `with-decoded-time-value' macros have
1999 *** `calendar-next-time-zone-transition', `time-add', and
2000 `time-subtract' no longer return time values in the obsolete and
2001 undocumented integer-pair format. Instead, they return a list of two
2005 ** New function `set-binary-mode' allows switching a standard stream
2006 of the Emacs process to binary I/O mode.
2009 ** The new function `directory-name-p' can be used to check whether a file
2010 name (as returned from, for instance, `file-name-all-completions') is
2011 a directory file name. It returns non-nil if the last character in
2012 the name is a directory separator character (forward slash on GNU and
2013 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2016 ** ASCII approximations to curved quotes are put in standard-display-table
2017 if the terminal cannot display curved quotes.
2020 ** Standard output and error streams now transliterate characters via
2021 standard-display-table, and encode output using locale-coding-system.
2022 To force a specific encoding, bind `coding-system-for-write' to the
2023 coding-system of your choice when invoking functions like `prin1' and
2027 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
2030 ** New possible value for `system-type': `nacl'.
2031 This is used by Google's Native Client (NaCl).
2034 ** `read-color' will now display the color names using the color itself
2035 as the background color.
2038 ** There is now a new variable `flyspell-sort-corrections-function'
2039 that allows changing the way corrections are sorted.
2041 ** Miscellaneous name change
2044 For consistency with the usual Emacs spelling, the Lisp variable
2045 `hfy-optimisations' has been renamed to `hfy-optimizations'.
2046 The old name should still work, as an obsolescent alias.
2048 ** Changes in Frame- and Window- Handling
2051 *** Emacs can now draw horizontal scroll bars on some platforms that
2052 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2053 Horizontal scroll bars are turned off by default.
2055 **** New function `horizontal-scroll-bars-available-p' telling whether
2056 horizontal scroll bars are available on the underlying system.
2058 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
2059 bars on all existing and future frames.
2061 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
2062 scroll bars on the selected frame.
2064 **** New frame parameters `horizontal-scroll-bars' and
2065 `scroll-bar-height' to set horizontal scroll bars and their height
2066 for individual frames and in `default-frame-alist'.
2068 **** New functions `frame-scroll-bar-height' and
2069 `window-scroll-bar-height' return the height of horizontal scroll
2070 bars on a specific frame or window.
2072 **** `set-window-scroll-bars' now accepts five parameters where the last
2073 two specify height and type of the window's horizontal scroll bar.
2075 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
2078 **** New buffer-local variables `horizontal-scroll-bar' and
2079 `scroll-bar-height'.
2082 *** New functions `frame-geometry' and `frame-edges' give access to a
2086 *** New functions `mouse-absolute-pixel-position' and
2087 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
2091 *** The function `window-edges' now accepts three additional arguments to
2092 retrieve body, absolute and pixel edges of the window.
2095 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
2096 `window-inside-absolute-pixel-edges' have been renamed to respectively
2097 `window-body-edges', `window-body-pixel-edges' and
2098 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
2101 *** New function `window-absolute-pixel-position' to get the screen
2102 coordinates of a visible buffer position.
2105 *** The height of a frame's menu and tool bar are no longer counted in the
2106 frame's text height. This means that the text height stands only for
2107 the height of the frame's root window plus that of the echo area (if
2108 present). This was already the behavior for frames with external tool
2109 and menu bars (like in the Gtk builds) but has now been extended to all
2113 *** Frames now do not necessarily preserve the number of columns or lines
2114 they display when setting default font, menu bar, fringe width, or
2115 scroll bars. In particular, maximized and fullscreen frames are
2116 conceptually never resized if such settings change. For fullheight and
2117 fullwidth frames, the behavior may depend on the toolkit used.
2118 **** New option `frame-inhibit-implied-resize' if non-nil, means that
2119 setting default font, menu bar, fringe width, or scroll bars of a
2120 specific frame does not resize that frame in order to preserve the
2121 number of columns or lines it displays.
2124 *** New function `window-preserve-size' allows you to preserve the size of
2125 a window without "fixing" it. It's supported by `fit-window-to-buffer',
2126 `temp-buffer-resize-mode' and `display-buffer'.
2129 *** New `display-buffer' action function `display-buffer-use-some-frame'.
2130 This displays the buffer in an existing frame other than the current
2131 frame, and allows the caller to specify a frame predicate to exclude
2135 *** New minor mode `window-divider-mode' and options
2136 `window-divider-default-places', `window-divider-default-bottom-width'
2137 and `window-divider-default-right-width'.
2140 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2141 Those features have been deprecated in Gtk+ for a long time.
2146 *** etags no longer qualifies class members by default.
2148 By default, `etags' will not qualify class members for C-like
2149 object-oriented languages with their class names and namespaces, and
2150 will remove qualifications used explicitly in the code from the tag
2151 names it puts in TAGS files. This is so the etags.el back-end for
2152 `xref-find-definitions' is more accurate and produces less false
2155 Use --class-qualify (-Q) if you want the old default behavior of
2156 qualifying class members in C++, Java, and Objective C. Note that
2157 using -Q might make some class members become "unknown" to `M-.'
2158 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
2159 qualified names by hand.
2162 *** New language Ruby
2164 Names of modules, classes, methods, functions, and constants are
2165 tagged. Overloaded operators are also tagged.
2169 Names of packages, functions, and types are tagged.
2172 *** Improved support for Lua
2174 Etags now tags functions even if the "function" keyword follows some
2175 whitespace at line beginning.
2178 * Changes in Emacs 25.1 on Non-Free Operating Systems
2181 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2182 This includes the makefile.w32-in files in various subdirectories, and
2183 the support files. The file nt/configure.bat now just tells the user
2184 to use the procedure described in nt/INSTALL, by running the Posix
2185 `configure' script in the top-level directory.
2188 ** Building Emacs for MS-Windows requires at least Windows XP
2189 or Windows Server 2003. The built binaries still run on all versions
2190 of Windows starting with Windows 9X.
2193 ** Emacs running on MS-Windows now supports the daemon mode.
2196 ** The byte counts in etags-generated TAGS files are now the same on
2197 MS-Windows as they are on other platforms.
2200 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2201 Pass '--without-ns' to configure to create an X11 build, the old default.
2204 ** OS X 10.5 or older is no longer supported.
2207 ** OS X on PowerPC is no longer supported.
2210 ** New variable `ns-use-fullscreen-animation' controls animation for
2211 non-native NS fullscreen. The default is nil. Set to t to enable
2212 animation when entering and leaving fullscreen. For native OSX fullscreen
2216 ** The new function 'w32-application-type' returns the type of an
2217 MS-Windows application given the name of its executable program file.
2219 ** New variable `w32-pipe-buffer-size'.
2220 It can be used to tune the size of the buffer of pipes created for
2221 communicating with subprocesses, when the program run by a subprocess
2222 exhibits unusual buffering behavior. Default is zero, which lets the
2223 OS use its default size.
2226 ----------------------------------------------------------------------
2227 This file is part of GNU Emacs.
2229 GNU Emacs is free software: you can redistribute it and/or modify
2230 it under the terms of the GNU General Public License as published by
2231 the Free Software Foundation, either version 3 of the License, or
2232 (at your option) any later version.
2234 GNU Emacs is distributed in the hope that it will be useful,
2235 but WITHOUT ANY WARRANTY; without even the implied warranty of
2236 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2237 GNU General Public License for more details.
2239 You should have received a copy of the GNU General Public License
2240 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2246 paragraph-separate: "[
\f]*$"