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 * Startup Changes in Emacs 25.2
32 * Changes in Emacs 25.2
35 ** `align-regexp' has a separate history for its interactive argument
36 `align-regexp' no longer shares its history with all other
37 history-less functions that use `read-string'
40 ** The networking code has been reworked so that it's more
41 asynchronous than it was (when specifying :nowait t in
42 `make-network-process'). How asynchronous it is varies based on the
43 capabilities of the system, but on a typical GNU/Linux system the DNS
44 resolution, the connection, and (for TLS streams) the TLS negotiation
45 are all done without blocking the main Emacs thread. To get
46 asynchronous TLS, the TLS boot parameters have to be passed in (see
47 the manual for details).
49 Certain process oriented functions (like `process-datagram-address')
50 will block until socket setup has been performed. The recommended way
51 to deal with asynchronous sockets is to avoid interacting with them
52 until they have changed status to "run". This is most easily done
53 from a process sentinel.
55 ** `make-network-stream' has always allowed :service to be specified
56 as a "number string" (i.e., :service "993") when using gethostbyname,
57 but has required using a real number (i.e., :service 993) on systems
58 without gethostbyname. This difference has now been eliminated, and
59 you can use "number strings" on all systems.
61 ** It is possible to disable attempted recovery on fatal signals
63 Two new variables allow to disable attempts to recover from stack
64 overflow and to avoid automatic auto-save when Emacs is delivered a
65 fatal signal. `attempt-stack-overflow-recovery', if set to `nil',
66 will disable attempts to recover from C stack overflows; Emacs will
67 then crash as with any other fatal signal.
68 `attempt-orderly-shutdown-on-fatal-signal', if set to `nil', will
69 disable attempts to auto-save the session and shut down in an orderly
70 fashion when Emacs receives a fatal signal; instead, Emacs will
71 terminate immediately. Both variables are non-`nil' by default.
72 These variables are for users who would like to avoid the small
73 probability of data corruption due to techniques Emacs uses to recover
77 * Editing Changes in Emacs 25.2
80 * Changes in Specialized Modes and Packages in Emacs 25.2
85 *** A new `s' command for switching to another eww buffer via the minibuffer.
88 *** The `o' command (`shr-save-contents') has moved to `O' to avoid collision
89 with the `o' command from `image-map'.
92 ** The commands that add ChangeLog entries now prefer a VCS root directory
93 for the ChangeLog file, if none already exists. Customize
94 `change-log-directory-files' to nil for the old behavior.
97 ** Support for non-string values of `time-stamp-format' has been removed.
102 *** New connection method "sg", which allows to edit files under
106 *** New connection method "doas" for OpenBSD hosts.
109 * New Modes and Packages in Emacs 25.2
112 * Incompatible Lisp Changes in Emacs 25.2
115 ** Resizing a frame no longer runs `window-configuration-change-hook'.
116 Put your function on `window-size-change-functions' instead.
119 * Lisp Changes in Emacs 25.2
121 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
123 ** Autoload files can be generated without timestamps,
124 by setting `autoload-timestamps' to nil.
126 ** `ert-with-function-mocked' of 'ert-x package allows mocking of functions
130 ** New functions `window-pixel-width-before-size-change' and
131 `window-pixel-height-before-size-change' allow to detect which window
132 changed size when `window-size-change-functions' are run.
135 * Changes in Emacs 25.2 on Non-Free Operating Systems
137 ** Intercepting hotkeys on Windows 7 and later now works better.
138 The new keyboard hooking code properly grabs system hotkeys such as
139 Win-* and Alt-TAB, in a way that Emacs can get at them before the
140 system. This makes the `w32-register-hot-key' functionality work
141 again on all versions of MS-Windows starting with Windows 7. On
142 Windows NT and later you can now register any hotkey combination. (On
143 Windows 9X, the previous limitations, spelled out in the Emacs manual,
147 * Installation Changes in Emacs 25.1
150 ** Building Emacs now requires C99 or later.
153 ** Building Emacs now requires GNU make, version 3.81 or later.
156 ** New configure option --with-cairo.
157 This builds Emacs with Cairo drawing. As a side effect, it provides
158 support for built-in printing, when Emacs was built with GTK+.
159 Cairo drawing is an experimental feature in Emacs, and subject to
160 change in future releases.
163 ** New configure option --with-modules.
164 This enables support for loading dynamic modules; see below.
167 ** By default, Emacs no longer works on IRIX. We expect that Emacs
168 users are not affected by this, as SGI stopped supporting IRIX in
169 December 2013. If you are affected, please send a bug report. You
170 should be able to work around the problem either by porting the Emacs
171 undumping code to GCC under IRIX, or by configuring --with-wide-int,
172 or by sticking with Emacs 24.4.
175 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
176 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
177 since Emacs 24.4, and the other variants were undocumented and were
178 obstacles to maintenance and development. GC_MARK_STACK and its
179 related symbols have been removed from the C internals.
182 ** 'configure' now prefers gnustep-config when configuring GNUstep.
183 If gnustep-config is not available, the old heuristics are used.
186 ** 'configure' now prefers inotify to gfile for file notification,
187 unless gfile is explicitly requested via --with-file-notification='gfile'.
190 ** 'configure' detects the kqueue file notification library on *BSD
191 and Mac OS X machines.
194 ** The configure option '--with-pkg-config-prog' has been removed.
195 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
198 ** The configure option '--with-mmdf' has been removed.
199 It was no longer useful, as it relied on libraries that are no longer
200 supported, and its presence led to confusion during configuration.
201 This affects only the 'movemail' utility; Emacs itself can still
202 process MMDF-format files as before.
205 ** The configure option '--enable-silent-rules' is now the default,
206 and silent rules are now quieter. To get the old behavior where
207 'make' chatters a lot, configure with '--disable-silent-rules' or
208 build with 'make V=1'.
211 ** The configure option '--with-gameuser' now allows you to specify a
212 group instead of a user if its argument is prefixed by ':' (a colon).
213 This will cause the game score files in ${localstatedir}/games/emacs
214 to be owned by that group, and the helper program for updating them to
215 be installed setgid. The option now defaults to the 'games' group.
218 ** The `grep-changelog' script (and its manual page) are no longer included.
219 It has no particular connection to Emacs and has not changed in years,
220 so if you want to use it, you can always take a copy from an older Emacs.
223 ** Emacs 25 comes with a new set of icons.
224 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
225 The old Emacs logo icons are available as `emacs23.png' in the same location.
228 ** New make target `check-expensive' to run additional tests.
229 This includes all tests which run via "make check", plus additional
230 tests which take more time to perform.
233 * Startup Changes in Emacs 25.1
236 ** When Emacs is given a file as a command line argument and
237 `initial-buffer-choice' is non-nil, display both the file and
238 `initial-buffer-choice'. When Emacs is given more than one file and
239 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
240 and *Buffer List*. This makes Emacs convenient to use from the
241 command line when `initial-buffer-choice' is non-nil.
244 ** The value of ‘initial-scratch-message’ is now treated as a doc string
245 and can contain escape sequences for command keys, quotes, and the like.
248 * Changes in Emacs 25.1
251 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
252 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
253 xwidget support, you can access the embedded webkit browser with `M-x
254 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
255 browser. The buffer will have a new mode, `xwidget-webkit-mode'
256 (similar to `image-mode'), which supports the webkit widget.
259 *** New functions for xwidget-webkit mode `xwidget-webkit-insert-string',
260 `xwidget-webkit-adjust-size-dispatch', `xwidget-webkit-back',
261 `xwidget-webkit-browse-url', `xwidget-webkit-reload',
262 `xwidget-webkit-current-url', `xwidget-webkit-scroll-backward',
263 `xwidget-webkit-scroll-forward', `xwidget-webkit-scroll-down',
264 `xwidget-webkit-scroll-up'.
267 ** Emacs can now load shared/dynamic libraries (modules).
268 A dynamic Emacs module is a shared library that provides additional
269 functionality for use in Emacs Lisp programs, just like a package
270 written in Emacs Lisp would. The functions `load', `require',
271 `load-file', etc. were extended to load such modules, as they do with
272 Emacs Lisp packages. The new variable `module-file-suffix' holds the
273 system-dependent value of the file-name extension (`.so' on Posix
274 hosts) of the module files.
276 A module should export a C-callable function named
277 `emacs_module_init', which Emacs will call as part of the call to
278 `load' or `require' which loads the module. It should also export a
279 symbol named `plugin_is_GPL_compatible' to indicate that its code is
280 released under the GPL or compatible license; Emacs will refuse to
281 load modules that don't export such a symbol.
283 If a module needs to call Emacs functions, it should do so through the
284 API defined and documented in the header file `emacs-module.h'. Note
285 that any module that provides Lisp-callable functions will have to use
286 Emacs functions such as `fset' and `funcall', in order to register its
287 functions with the Emacs Lisp interpreter.
289 Modules can create `user-ptr' Lisp objects that embed pointers to C
290 struct's defined by the module. This is useful for keeping around
291 complex data structures created by a module, to be passed back to the
292 module's functions. User-ptr objects can also have associated
293 "finalizers" -- functions to be run when the object is GC'ed; this is
294 useful for freeing any resources allocated for the underlying data
295 structure, such as memory, open file descriptors, etc. A new
296 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
299 Loadable modules in Emacs are an experimental feature, and subject to
300 change in future releases. For that reason, their support is disabled
301 by default, and must be enabled by using the `--with-modules' option
305 ** A second dir-local file (.dir-locals-2.el) is now accepted.
306 See the variable `dir-locals-file-2' for more information.
309 ** Network security (TLS/SSL certificate validity and the like) is
310 added via the new Network Security Manager (NSM) and controlled via
311 the `network-security-level' variable.
314 ** International domain names (IDNA) are now encoded via the new
315 puny.el library, so that one can visit web sites like
316 "http://méxico.icom.museum".
319 ** C-h l now also lists the commands that were run.
321 ** The new M-s M-w key binding uses eww to search the web for the
325 ** The new `timer-list' command lists all active timers in a buffer
326 where you can cancel them with the `c' command.
328 ** M-x suggests shorthands and ignores obsolete commands for completion.
329 ** x-select-enable-clipboard is renamed select-enable-clipboard.
330 x-select-enable-primary and renamed select-enable-primary.
331 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
332 name it), with the proviso that on some systems (e.g. Windows)
333 select-enable-primary is ineffective since the system doesn't
334 have the equivalent of a primary selection.
337 ** New option `switch-to-buffer-in-dedicated-window' allows you to
338 customize how `switch-to-buffer' proceeds interactively when the
339 selected window is strongly dedicated to its buffer.
342 ** The option `even-window-heights' has been renamed to
343 `even-window-sizes' and now handles window widths as well.
346 ** New function `read-multiple-choice' use to prompt for
347 multiple-choice questions, with a handy way to display help texts.
350 ** terpri gets an optional arg ENSURE to conditionally output a newline.
353 ** `insert-register' now leaves point after the inserted text
354 when called interactively. A prefix argument toggles this behavior.
357 ** The new variable `term-file-aliases' replaces some files from lisp/term.
358 The function `tty-run-terminal-initialization' consults this variable
359 when deciding what terminal-specific initialization code to run.
362 ** New variable `system-configuration-features', listing some of the
363 main features that Emacs was compiled with. This is mainly intended
364 for use in Emacs bug reports.
367 ** A password is now hidden also when typed in batch mode. Another
368 hiding character but the default `.' can be used by let-binding the
369 variable `read-hide-char'.
372 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
375 * Editing Changes in Emacs 25.1
378 ** M-x suggests shorthands and ignores obsolete commands for completion.
383 *** Successive single-char deletions are collapsed in the undo-log just like
384 successive char insertions. Which commands invoke this behavior is
385 controlled by the new `undo-auto-amalgamate' function. See the node
386 "Undo" in the ELisp manual for more details.
389 *** The heuristic used to insert `undo-boundary' after each command
390 has changed, so that if a command causes changes in more than just the
391 current buffer, Emacs now calls `undo-boundary' in every buffer
392 affected by the command.
395 ** New command `comment-line' bound to `C-x C-;'.
397 ** New and improved facilities for inserting Unicode characters
400 *** Unicode names entered via C-x 8 RET now use substring completion by default.
403 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
404 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
407 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
408 as you type. See also the new variable ‘text-quoting-style’.
411 ** New minor mode global-eldoc-mode is enabled by default.
414 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
415 Bracketed paste mode causes text terminals to wrap pasted text in special
416 escape sequences that allow Emacs to tell the difference between text
417 you type and text you paste from other applications. Emacs then
418 avoids interpreting each character in the pasted text as it does with
419 keyboard input, which results in a paste experience similar to that
420 under a window system, and significant performance improvements when
421 pasting large amounts of text.
423 Bracketed paste mode is disabled by default, so Emacs automatically
424 enables it at startup if the terminal supports it.
427 ** Emacs now supports the latest version of the UBA.
428 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
429 was updated to support all the latest additions and changes introduced
430 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
431 This includes full support for directional isolates and the
432 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
436 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
439 ** New buffer-local `electric-pair-local-mode'.
442 ** New variable `fast-but-imprecise-scrolling' inhibits
443 fontification during full screen scrolling operations, giving less
444 hesitant operation during auto-repeat of C-v, M-v at the cost of
445 possible inaccuracies in the end position.
448 ** New documentation command `describe-symbol'.
449 Works for functions, variables, faces, etc. It is bound to `C-h o' by
453 ** New function `custom-prompt-customize-unsaved-options' checks for
454 unsaved customizations and prompts user to customize (if found). It
455 is intended for adding to 'kill-emacs-query-functions'.
458 ** The old `C-x w' bindings in hi-lock-mode are officially deprecated
459 in favor of the global `M-s h' bindings introduced in Emacs-23.1.
460 They'll disappear soon.
463 ** New bindings for 'query-replace-map'.
464 `undo', undo the last replacement; bound to `u'.
465 `undo-all', undo all replacements; bound to `U'.
468 * Changes in Specialized Modes and Packages in Emacs 25.1
473 *** New command `checkdoc-package-keywords' checks if the
474 current package keywords are recognized. Set the new option
475 `checkdoc-package-keywords-flag' to non-nil to make
476 `checkdoc-current-buffer' call this function automatically.
479 *** New function `checkdoc-file' checks for style errors.
480 It's meant for use together with `compile':
481 emacs -batch --eval "(checkdoc-file \"subr.el\")"
486 *** The desktop format version has been upgraded from 206 to 208.
487 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
488 cannot read a version 208 desktop. To upgrade your desktop file, you
489 must explicitly request the upgrade, by C-u M-x desktop-save. You are
490 recommended to do this as soon as you have firmly upgraded to Emacs
491 25.1 (or later). Should you ever need to downgrade your desktop file
492 to version 206, you can do this with C-u C-u M-x desktop-save.
495 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
496 It raises an error if a bookmark of that name already exists,
497 unlike `bookmark-set' which silently updates an existing bookmark.
502 *** New user options `mm-html-inhibit-images' and `mm-html-blocked-images'
503 now control how mm-* functions fetch and display images in an HTML
504 message. Gnus still uses `gnus-inhibit-images' and `gnus-blocked-images'
505 for that purpose, i.e., binds mm-html- variables with those gnus-
506 variables, but other packages do not have to bind gnus- variables now.
509 *** `mm-inline-text-html-with-images' has been removed.
510 Use `mm-html-inhibit-images' instead. Note that the value is opposite
516 *** `imap-ssl-program' has been removed, and imap.el uses the internal
517 GnuTLS encryption functions if possible.
522 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
523 the ordering of object keys by default.
526 *** New commands `json-pretty-print-ordered' and
527 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
528 object keys sorted alphabetically.
531 ** Prog mode has some support for multi-mode indentation.
532 This allows better indentation support in modes that support multiple
533 programming languages in the same buffer, like literate programming
534 environments or ANTLR programs with embedded Python code.
536 A major mode can provide indentation context for a sub-mode through
537 the `prog-indentation-context' variable. To support this, modes that
538 provide indentation should use `prog-widen' instead of `widen' and
539 `prog-first-column' instead of a literal zero. See the node
540 "Mode-Specific Indent" in the ELisp manual for more details.
542 ** Prettify Symbols mode
545 *** Prettify Symbols mode supports custom composition predicates. By
546 overriding the default `prettify-symbols-compose-predicate', modes can
547 specify in which contexts a symbol may be displayed as some Unicode
548 character. `prettify-symbols-default-compose-p' is the default which
549 is suitable for most programming languages such as C or Lisp (but not
553 *** Symbols can be unprettified while point is inside them.
554 New variable `prettify-symbols-unprettify-at-point' configures this.
556 ** Enhanced xterm support
559 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
560 This variable tells Emacs which advanced capabilities are available in
561 the xterm terminal emulator used to display Emacs text-mode frames.
562 The default is to check each capability, and use it if available.
563 (This variable was introduced in Emacs 24.1, but was not announced in
567 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
568 in the surrounding GUI (using the OSC-52 escape sequence). This only works
569 if your xterm supports it and enables the `allowWindowOps' options (disabled
570 by default at least in Debian, for security reasons).
572 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
573 escape sequence) if your xterm has the feature enabled but for that you
574 additionally need to add `getSelection' to `xterm-extra-capabilities'.
577 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
580 ** The `save-place' variable is replaced by `save-place-mode'.
585 *** ERC can now hide message types by network or channel.
586 `erc-hide-list' will hide all messages of the specified type, while
587 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
588 specified message types for the respective specified targets.
590 *** New variable `erc-default-port-tls' used to connect to TLS IRC
594 *** Reconnection is now asynchronous.
597 *** Nick completion is now case-insensitive again after inadvertently
598 being made case-sensitive in Emacs 24.2.
603 *** New commands, key binds, and menu items.
605 **** `<' and `>' for navigating previous and next tracks in playlist
607 **** New play/pause command `mpc-toggle-play' bound to `s'
609 **** `g' bound to new command `mpc-seek-current' will navigate current
612 **** New commands `mpc-toggle-{consume,repeat,single,shuffle}' for
613 toggling playback modes.
616 *** Now supports connecting to a UNIX domain socket.
619 *** Looks at more image file names to use as album art.
620 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
621 (XP) in addition to cover.jpg.
624 *** Searches in more locations for MPD configuration files.
625 MPD supports the XDG base directory specification since version 0.17.6.
630 *** `midnight-mode' is now a proper minor mode.
633 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
638 *** New "external" package status.
639 An external package is any installed package that's not built-in and
640 not from `package-user-dir', which usually means it's from an entry in
641 `package-directory-list'. They are treated much like built-in
642 packages, in that they cannot be deleted through the package menu and
643 are not considered for upgrades.
645 The effect is that a user can manually place a specific version of a
646 package inside `package-directory-list' and the package menu will
650 *** If a package is available on multiple archives and one has higher
651 priority (as per `package-archive-priorities') only that one is
652 listed. This can be configured with `package-menu-hide-low-priority'.
655 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
656 This includes the above-mentioned low-priority packages, as well as
657 available packages whose version is lower than the currently installed
658 version (which were previously impossible to display).
659 This allows users to downgrade a package if a lower version is
663 *** When filtering the package menu, keywords starting with "arc:" or
664 "status:" represent package archive or status, respectively, instead
668 *** Most functions which involve downloading information now take an
669 ASYNC argument. If it is non-nil, package.el performs the download(s)
673 *** New variable `package-menu-async' controls whether the
674 package-menu uses asynchronous downloads.
677 *** `package-install-from-buffer' and `package-install-file' work on directories.
678 This follows the same rules as installing from a .tar file, except the
679 -pkg file is optional.
682 *** Packages which are dependencies of other packages cannot be deleted.
683 The FORCE argument to `package-delete' overrides this.
686 *** New custom variable `package-selected-packages' tracks packages
687 which were installed by the user (as opposed to installed as
688 dependencies). This variable can also be manually customized.
691 *** New command `package-install-selected-packages' installs all
692 packages from `package-selected-packages' which are currently missing.
695 *** New command `package-autoremove' removes all packages which were
696 installed strictly as dependencies but are no longer needed.
701 When you invoke `shell' interactively, the *shell* buffer will now
702 display in a new window. However, you can customize this behavior via
703 the `display-buffer-alist' variable. For example, to get
704 the old behavior -- *shell* buffer displays in current window -- use
705 (add-to-list 'display-buffer-alist
706 '("^\\*shell\\*$" . (display-buffer-same-window))).
710 *** The `:protection' slot option is not obeyed any more.
712 *** The `newname' argument to constructors is optional&deprecated.
713 If you need your objects to be named, do it by inheriting from `eieio-named'.
715 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
717 *** The <class> variables are declared obsolete.
719 *** The <initarg> variables are declared obsolete.
721 *** defgeneric and defmethod are declared obsolete.
722 Use the equivalent facilities from cl-generic.el instead.
724 *** `constructor' is now an obsolete alias for `make-instance'.
725 --- `pcase' accepts a new UPattern `eieio'.
730 *** New command `ido-bury-buffer-at-head' bound to C-S-b
731 Bury the buffer at the head of `ido-matches', analogous to how C-k
732 kills the buffer at head.
735 *** A prefix argument to `ido-restrict-to-matches' will reverse its
736 meaning, and the list is restricted to those elements that do not
737 match the current input.
742 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
743 The new commands `next-line-or-history-element' and
744 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
745 minibuffer, allow by-line movement through minibuffer history,
746 similarly to an ordinary buffer. Only when point moves over
747 the bottom/top of the minibuffer it goes to the next/previous history
748 element. `M-p' and `M-n' still move directly to previous/next history
751 ** Search and Replace
754 *** `isearch' and `query-replace' can now perform character folding in matches.
755 Isearch does that by default, while `query-replace' will do that if
756 the new variable `replace-character-fold' is customized to a non-nil
757 value. This is analogous to case folding, but instead of disregarding
758 case variants, it disregards wider classes of distinctions between
759 similar characters. (Case folding is a special case of character
760 folding.) This means many characters in the search string will match
761 entire groups of characters instead of just themselves.
763 For instance, the " will match all variants of double quotes (like “
764 and ”), and the letter a will match all of its accented cousins, even
765 those composed of multiple characters, as well as many other symbols
768 Character folding is enabled by customizing `search-default-mode' to
769 the value `character-fold-to-regexp'. If you want to turn character
770 folding off, customize the value of `search-default-mode' to the `nil'
771 value. You can also toggle character folding in the middle of a
772 search by typing `M-s ''.
775 *** New user option `search-default-mode'.
776 This option specifies the default mode for Isearch. The default
777 value, `character-fold-to-regexp' specifies that Isearch should fold
778 characters when searching.
781 *** New function `character-fold-to-regexp' can be used
782 by searching commands to produce a regexp matching anything that
783 character-folds into STRING.
786 *** The new M-s M-w key binding uses eww to search the web for the
787 text in the region. The search engine to use for this is specified by
788 the customizable variable `eww-search-prefix'.
791 *** Query-replace history is enhanced.
792 When query-replace reads the FROM string from the minibuffer, typing
793 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
794 and TO are the original text and its replacement, and SEP is an arrow
795 string defined by the new variable `query-replace-from-to-separator'.
796 To select a prior replacement, type `M-p' until the desired
797 replacement appears in the minibuffer, and then exit the minibuffer by
802 *** If `quick-calc' is called with a prefix argument, insert the
803 result of the calculation into the current buffer.
806 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
807 this you can tell Edebug not to stop at the start of the first
808 instrumented function.
813 *** New minor mode `global-eldoc-mode'
814 It is turned on by default, and affects `*scratch*' and other buffers
815 whose major mode supports Emacs Lisp.
818 *** `eldoc-documentation-function' now defaults to `ignore'
821 *** `describe-char-eldoc' displays information about character at point,
822 and can be used as a default value of `eldoc-documentation-function'. It is
823 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
824 ] [, ] [, etc.) while using mono-spaced font.
829 *** HTML can now be rendered using variable-width fonts.
832 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
833 whether to use variable-pitch fonts or not. The user can also
834 customize the `shr-use-fonts' variable.
837 *** A new command `C' (`eww-toggle-colors') can be used to toggle
838 whether to use the HTML-specified colors or not. The user can also
839 customize the `shr-use-colors' variable.
842 *** A new command `R' (`eww-readable') will try do identify the main
843 textual parts of a web page and display only that, leaving menus and
844 the like off the page.
847 *** Images that are being loaded are now marked with grey
848 "placeholder" images of the size specified by the HTML. They are then
849 replaced by the real images asynchronously, which will also now
850 respect width/height HTML specs (unless they specify widths/heights
851 bigger than the current window).
854 *** You can now use several eww buffers in parallel by renaming eww
855 buffers you want to keep separate.
858 *** Partial state of the eww buffers (the URIs and the titles of the
859 pages visited) is now preserved in the desktop file.
862 *** `eww-after-render-hook' is now called after eww has rendered
863 the data in the buffer.
866 *** The `eww-reload' command now takes a prefix to not reload via
867 the net, but just use the local copy of the HTML.
870 *** The DOM shr and eww uses has been changed to the general Emacs
871 xml.el/libxml2 DOM, and a new package dom.el has been added to
872 interact with this DOM. See the Emacs Lisp manual for interface
876 *** `mailcap-mime-data' is now consulted when displaying PDF files.
879 *** The new `S' command will list all eww buffers, and allow managing
883 *** https pages with valid certificates have headers marked in green, while
884 invalid certificates are marked in red.
889 *** text/html messages that contain inline image parts will be
890 transformed into multipart/related messages before sending.
893 *** The `message-valid-fqdn-regexp' variable has been removed, since
894 there are now top-level domains added all the time. Message will no
895 longer warn about sending emails to top-level domains it hasn't heard
898 *** `message-beginning-of-line' (bound to C-a) understands folded headers.
899 In `visual-line-mode' it will look for the true beginning of a header
900 while in non-`visual-line-mode' it will move the point to the indented
904 ** In Show Paren Mode, a parenthesis can be highlighted when point
905 stands inside it, and certain parens can be highlighted when point is
906 at BOL or EOL, or in whitespace there. To enable these, customize,
907 respectively, `show-paren-when-point-inside-paren' or
908 `show-paren-when-point-in-periphery'.
911 ** If gpg2 exists on the system, it is now used as the default value
912 of `epg-gpg-program' (instead of gpg).
917 *** Images are automatically scaled before displaying based on the
918 `image-scaling-factor' variable (if Emacs supports scaling the images
922 *** Images inserted with `insert-image' and related functions get a
923 keymap put into the text properties (or overlays) that span the
924 image. This keymap binds keystrokes for manipulating size and
925 rotation, as well as saving the image to a file. These commands are
926 also available in `image-mode'.
929 *** A new library for creating and manipulating SVG images has been
930 added. See the "SVG Images" section in the lispref manual for
934 *** New setf-able function to access and set image parameters is
935 provided: `image-property'.
941 *** Strings after `:documentation' are highlighted as docstrings.
942 This enhances Lisp mode fontification to handle documentation of the
943 form `(:documentation "the doc string")' used in Common Lisp code for
944 CLOS class and slot documentation.
949 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
952 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
953 *** `string-rectangle' provides on-the-fly preview of the result.
956 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
957 These should be used in preference to `font-lock-fontify-buffer' when
961 ** Macro `minibuffer-with-setup-hook' can optionally append a function
962 to `minibuffer-setup-hook'.
964 If the first argument of the macro is of the form `(:append FUN)',
965 then FUN will be appended to `minibuffer-setup-hook', instead of
970 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
973 *** `pcase' accepts the new UPattern `cl-struct'.
975 ** Calendar and diary
978 *** The default `diary-file' is now located in .emacs.d.
981 *** New commands to insert diary entries with Chinese dates:
982 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
983 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
986 *** The calendar can now list and mark diary entries with Chinese dates.
987 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
990 *** The option `calendar-mode-line-format' can now be nil,
991 which means to do nothing special with the mode line in calendars.
994 *** New option `calendar-weekend-days'.
995 The option customizes which day headers receive the
996 `calendar-weekend-header' face.
999 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
1002 *** Many items obsolete since at least version 23.1 have been removed.
1003 The majority were function/variable/face aliases, too numerous to list here.
1006 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
1007 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
1009 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
1011 **** Macro `calendar-for-loop'.
1013 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
1015 **** The nil and list forms of `diary-display-function'.
1018 ** New ERT function `ert-summarize-tests-batch-and-exit'.
1019 If the output of ERT tests in batch mode execution can be saved to a
1020 log file, then it can be passed as an argument to the above function
1021 to produce a neat summary.
1024 ** New js.el option `js-indent-first-init'.
1025 It was renamed from `js-indent-first-initialiser', to avoid issues
1026 with American vs British spelling.
1031 ** Info mode now displays symbol names in fixed-pitch font.
1032 If you want to get the old behavior back, customize the `Info-quoted'
1033 face to use the same definitions as the default face.
1036 *** `Info-fontify-maximum-menu-size' can be t for no limit.
1039 *** `info-display-manual' can now be given a prefix argument which (any
1040 non-nil value) directs the command to limit the completion
1041 alternatives to currently visited manuals.
1044 ** ntlm.el has support for NTLM2.
1049 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
1050 to delete or undelete multiple messages.
1053 *** Rmail can now render HTML mail messages if your Emacs was built with
1054 libxml2 or if you have the Lynx browser installed. By default, Rmail
1055 will display the HTML version of a mail message that has both HTML and
1056 plain text parts, if display of HTML email is possible; customize the
1057 `rmail-mime-prefer-html' option to `nil' if you don't want that.
1060 *** In the commands that make summaries by subject, recipients, or senders,
1061 you can no longer use commas to separate regular expressions.
1064 ** SES now supports local printer functions; see `ses-define-local-printer'.
1066 ** Shell-script Mode
1068 *** In sh-mode you can now use `sh-shell' as a file-local variable to
1069 specify the type of shell in use (bash, csh, etc).
1072 *** New value `always' for `sh-indent-after-continuation'.
1073 This provides old-style ("dumb") indentation of continued lines.
1074 See the doc string of `sh-indent-after-continuation' for details.
1078 *** Fatal TLS errors are now silent by default.
1081 *** If Emacs isn't built with TLS support, an external TLS-capable
1082 program is used instead. This program used to be run in --insecure
1083 mode by default, but has now changed to be secure instead, and will
1084 fail if you try to connect to non-verifiable hosts. This is
1085 controlled by the `tls-program' variable.
1090 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1091 When `url-handler-mode' is enabled, file operations for these
1092 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1095 *** The URL package allows customizing the `url-user-agent' string.
1096 The new `url-user-agent' variable can be customized to be a string or
1100 *** The new interface variable `url-request-noninteractive' can be used
1101 to specify that we're running in a noninteractive context, and that
1102 we should not be queried about things like TLS certificate validity.
1105 *** If URL is used with a https connection, the first callback argument
1106 plist will contain a :peer element that has the output of
1107 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
1110 *** The new function `url-cookie-delete-cookie' can be used to
1111 programmatically delete all cookies, or cookies from a specific
1117 *** New connection method "afp", which allows you to access Mac OS X
1118 volumes via the Apple Filing Protocol.
1121 *** New connection method "nc", which allows you to access dumb
1125 *** Method-specific parameters can be overwritten now with variable
1126 `tramp-connection-properties'.
1129 *** Handler for `file-notify-valid-p' for remote machines that support
1130 filesystem notifications.
1135 *** New user variable `sql-default-directory' enables remote
1136 connections using Tramp.
1139 *** New command `sql-send-line-and-next'.
1140 This command, bound to `C-c C-n' by default, sends the current line to
1141 the SQL process and advances to the next line, skipping whitespace and
1145 *** Added support for Vertica SQL.
1147 ** VC and related modes
1150 *** Basic push support, via `vc-push', bound to `C-x v P'.
1151 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1152 (undocumented) command vc-hg-push now behaves slightly differently.
1155 *** The new command vc-region-history shows the log+diff of the active region.
1158 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
1159 This command is useful when you perform version control commands
1160 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1161 back-end for the buffer's file, or remove it from version control.
1164 *** The VC state indicator in the mode line now defaults to more
1165 colorful faces to make it more obvious to the user what the state is.
1166 See the `vc-faces' customization group.
1169 *** New option `vc-annotate-background-mode' controls whether
1170 the color range from `vc-annotate-color-map' is applied to the
1171 background or to the foreground.
1174 *** `compare-windows' now compares text with the most recently selected window
1175 instead of the next window. If you want the previous behavior of
1176 comparing with the next window, customize the new option
1177 `compare-windows-get-window-function' to the value
1178 `compare-windows-get-next-window'.
1181 *** Two new faces `compare-windows-removed' and `compare-windows-added'
1182 replace the face `compare-windows', which is now an obsolete alias for
1183 `compare-windows-added'.
1186 *** The VC state indicator in the mode line now has different faces
1187 corresponding to each of the possible states. See the `vc-faces'
1188 customization group.
1191 *** `log-edit-insert-changelog' converts "(tiny change)" to
1192 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
1193 nil to disable this.
1196 ** VHDL mode now supports VHDL'08.
1201 *** Decimal display mode uses "," groups, so it's more
1202 fitting for use in money calculations
1205 *** Factorial works with non-integer inputs.
1210 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1211 macro argument expansion, interactive macro evaluation and automatic
1212 scanning of #define'd symbols.
1215 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
1216 result of evaluating a macro.
1219 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
1220 all defined symbols in `hide-ifdef-env'.
1223 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
1224 file name patterns. Defaults to files whose extension is one of `.h',
1225 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
1228 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
1229 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1230 (This could happen when an idempotent header file is visited again,
1231 when its guard symbol is already defined.) Defaults to `t'.
1234 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
1235 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1236 looking for macro definitions. By default, no symbols are ignored.
1241 *** New custom variable `tex-print-file-extension' to help users who
1242 use PDF instead of DVI.
1245 *** TeX mode now supports Prettify Symbols mode. When enabling
1246 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1247 many other math macros are displayed using unicode characters.
1250 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
1251 By default, 32 consecutive spaces or four consecutive TABs are
1252 considered to be too deep, but the new variable
1253 `whitespace-big-indent-regexp' can be customized to change that.
1256 ** New options in `tildify-mode'.
1257 New options `tildify-space-string', `tildify-pattern', and
1258 `tildify-foreach-region-function' variables make
1259 `tildify-string-alist', `tildify-pattern-alist', and
1260 `tildify-ignored-environments-alist' variables (as well as a few
1261 helper functions) obsolete.
1264 ** New package Xref replaces Etags's front-end and UI
1266 The new package Xref provides a generic framework and new commands to
1267 find and move to definitions of functions, macros, data structures
1268 etc., as well as go back to the location where you were before moving
1269 to a definition. It supersedes and obsoletes many Etags commands,
1270 while still using the etags.el code that reads the TAGS tables as one
1273 The command `xref-find-definitions' replaces `find-tag' and provides
1274 an interface to pick one definition among several.
1275 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
1276 `pop-tag-mark', but has a keybinding (`M-,') different from the one
1277 `pop-tag-mark' used.
1279 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
1280 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1281 `xref-find-apropos' replaces `find-tag-regexp'.
1283 As a result of this, the following commands are now obsolete:
1284 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1287 `tags-loop-continue' is not obsolete because it's still useful in
1288 `tags-search' and `tags-query-replace', for which there are no direct
1292 *** Variants of `tags-search' and `tags-query-replace' in Dired were also
1293 replaced by xref-style commands, see the "Dired" section below.
1298 `find-tag-marker-ring-length' is now an obsolete alias for
1299 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1300 alias for a private variable. `xref-push-marker-stack' and
1301 `xref-pop-marker-stack' should be used instead to manipulate the stack
1302 of searches for definitions.
1305 *** `xref-find-definitions' and `describe-function' now display
1306 information about mode local overrides (defined by cedet/mode-local.el
1307 `define-overloadable-function' `define-mode-local-overrides').
1309 The framework's Lisp API is still experimental and can change in major,
1310 backward-incompatible ways.
1313 ** New package Project
1315 The new package Project provides generic infrastructure for dealing
1316 with projects. The main commands included in it are
1317 `project-find-file' and `project-find-regexp'.
1319 The Lisp API of this package is still experimental.
1322 EUDC's LDAP backend has been improved.
1325 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1328 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1329 subprocess instead of on the command line.
1332 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1333 need to configure this manually anymore.
1336 *** The LDAP configuration section of EUDC's manual has been
1339 There have also been customization changes.
1342 *** New custom variable `eudc-server-hotlist' to allow specifying
1343 multiple EUDC servers in init file.
1346 *** Custom variable `eudc-inline-query-format' defaults to completing
1347 on email and firstname instead of surname.
1350 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1351 to avoid interfering with the kill ring.
1354 *** Custom variable `eudc-inline-expansion-format' defaults to
1355 "Firstname Surname <mail-address>".
1358 *** Custom variable `eudc-options-file' defaults to
1359 "~/.emacs.d/eudc-options".
1362 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1363 allow overriding the regular expression that recognizes the ldapsearch
1364 command line's password prompt.
1367 EUDC's BBDB backend now supports BBDB 3.
1370 EUDC's PH backend (eudcb-ph.el) is obsolete.
1375 *** The new built-in command `clear' can scroll window contents out of sight.
1376 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1379 *** New buffer syntax '#<buffer-name>', which is equivalent to
1380 '#<buffer buffer-name>'. This shorthand makes interacting with
1381 buffers from eshell more convenient. Custom variable
1382 `eshell-buffer-shorthand', which has been broken for a while, has been
1386 *** By default, eshell "visual" program buffers (created by
1387 `eshell-visual-commands' and similar custom vars) are no longer killed
1388 when their processes die. This fixes issues with short-lived commands
1389 and makes visual programs more useful in general. For example, if
1390 "git log" is a visual command, it will always show the visual command
1391 buffer, even if the "git log" process dies. For the old behavior,
1392 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1397 *** Support for the Google Chrome web browser.
1400 *** Support for the Conkeror web browser.
1403 *** Support for several ancient browsers is now officially obsolete.
1406 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1407 be added to the archive.
1410 ** Autorevert: dired buffers are also auto-reverted via file
1411 notifications, if Emacs is compiled with file notification support.
1413 ** File Notifications
1416 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1419 *** The new event `stopped' signals, that a file notification watch is
1420 not active any longer.
1423 *** The new function `file-notify-valid-p' checks, whether a file
1424 notification descriptor still corresponds to an activate watch.
1429 *** The command `dired-do-compress' bound to `Z' now can compress
1430 directories and decompress zip files.
1433 *** New command `dired-do-compress-to' bound to `c' can be used to
1434 compress many marked files into a single named archive. The
1435 compression command is determined from the new
1436 `dired-compress-files-alist' variable.
1439 *** In wdired, when editing files to contain slash characters,
1440 the resulting directories are automatically created. Whether
1441 to do this or not is controlled by the
1442 `wdired-create-parent-directories' variable.
1445 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1446 viewing HTML files and the like.
1448 *** New user interface for the `A' and `Q' commands.
1449 These keys, now bound to `dired-do-find-regexp' and
1450 `dired-do-find-regexp-and-replace', work similarly to `xref-find-apropos'
1451 and `xref-query-replace-in-results': they present the matches
1452 in the `*xref*' buffer and let you move through the matches. No need
1453 to use `tags-loop-continue' to resume the search or replace loop. The
1454 previous commands, `dired-do-search' and
1455 `dired-do-query-replace-regexp', are still available, but not bound to
1456 keys; rebind `A' and `Q' to invoke them if you want the old behavior
1457 back. We intend to obsolete the old commands in a future release.
1459 ** Tabulated List Mode
1462 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1463 call `tabulated-list-init-header', in which case it will have no
1467 *** `tabulated-list-print' takes a second optional argument, update,
1468 which specifies an alternative printing method which is faster when
1469 few or no entries have changed.
1471 ** Obsolete packages
1477 *** landmark.el (moved to elpa.gnu.org)
1480 * New Modes and Packages in Emacs 25.1
1483 ** pinentry.el allows GnuPG passphrase to be prompted through the
1484 minibuffer instead of a graphical dialog, depending on whether the gpg
1485 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1486 is set). This feature requires newer versions of GnuPG (2.1.5 or
1487 later) and Pinentry (0.9.5 or later). To use this feature, add
1488 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1489 configuration with "gpgconf --reload gpg-agent".
1492 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1493 The main entry points are `cl-defgeneric' and `cl-defmethod'. See the
1494 node "Generic Functions" in the Emacs Lisp manual for more details.
1497 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1498 SCSS (Sassy CSS) files.
1501 ** let-alist is a new macro (and a package) that allows one to easily
1502 let-bind the values stored in an alist.
1505 ** `tildify-mode' allows automatic insertion of hard spaces as one
1506 types the text. Breaking line after a single-character words is
1507 forbidden by Czech and Polish typography (and may be discouraged in
1508 other languages), so `auto-tildify-mode' makes it easier to create
1509 a typographically-correct documents.
1512 ** The `seq' library adds sequence manipulation functions and macros
1513 that complement basic functions provided by subr.el. All functions
1514 are prefixed with `seq-' and work on lists, strings and vectors.
1515 `pcase' accepts a new Upattern `seq'.
1518 ** The `map' library provides map-manipulation functions that work on
1519 alists, hash-table and arrays. All functions are prefixed with
1520 `map-'. `pcase' accepts a new UPattern `map'.
1523 ** The `thunk' library provides functions and macros to control the
1524 evaluation of forms.
1527 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1528 support for JSX, an XML-like syntax extension to ECMAScript.
1531 * Incompatible Lisp Changes in Emacs 25.1
1534 ** `setq' and `setf' must now be called with an even number of
1535 arguments. The earlier behavior of silently supplying a nil to the
1536 last variable when there was an odd number of arguments has been
1540 ** `syntax-begin-function' is declared obsolete.
1541 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1542 slot in font-lock-defaults.
1545 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1546 called during startup. Users who call this function in their init
1547 file and still expect it to be run after startup should set
1548 `package-enable-at-startup' to t after the call to
1549 `package-initialize'.
1552 ** `:global' minor mode use `setq-default' rather than `setq'.
1553 This means that you can't use `make-local-variable' and expect them to
1554 "magically" become buffer-local.
1557 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1558 The `track-mouse' form no longer refrains from changing the shape of
1559 the mouse pointer for the entire time the body of that form is
1560 executed. Lisp programs that use `track-mouse' for dragging across
1561 large portions of the Emacs display, and want to avoid changes in the
1562 pointer shape during dragging, should bind the variable `track-mouse'
1563 to the special value `dragging' in the body of the form.
1566 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1567 has any effect. (This change was made in Emacs 24.4 but was not
1568 advertised at the time.)
1571 ** `indirect-function' does not signal `void-function' any more.
1572 This is mostly a bug-fix, since this change was missed back in 24.4 when
1573 symbol-function was changed not to signal `void-function' any more.
1576 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1579 ** Comint, term, and compile do not set the EMACS env var any more.
1580 Use the INSIDE_EMACS environment variable instead.
1582 ** `C-up', `C-down', `C-left' and `C-right' are now defined in term
1583 mode to send the same escape sequences that xterm does. This makes
1584 things like forward-word in readline work.
1587 ** hideshow mode got four key bindings that are analogous to outline
1588 mode bindings: `C-c @ C-a', `C-c @ C-t', `C-c @ C-d', and `C-c @ C-e.'
1591 ** `save-excursion' does not save&restore the mark any more.
1592 Use `save-mark-and-excursion' if you want the old behavior.
1595 ** `read-buffer' and `read-buffer-function' can now be called with a 4th
1596 argument (`predicate').
1599 ** `completion-table-dynamic' by default stays in the minibuffer.
1600 The minibuffer will be the current buffer when the function is called.
1601 If you want the old behavior of calling the function in the buffer
1602 from which the minibuffer was entered, use the new argument
1603 `switch-buffer' to `completion-table-dynamic'.
1606 ** window-configurations no longer record the buffers' marks.
1609 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1610 active region handling.
1613 ** deactivate-mark is now buffer-local.
1616 ** `cl-the' now asserts that its argument is of the given type.
1619 ** `process-running-child-p' may now return a numeric process
1620 group ID instead of `t'.
1623 ** Mouse click events on mode line or header line no longer include
1624 any reference to a buffer position. The 6th member of the mouse
1625 position list returned for such events is now nil.
1628 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1629 These slots used to hold key-shortcut data, but have been obsolete since
1633 ** Emacs no longer downcases the first letter of a system diagnostic
1634 when signaling a file error. For example, it now reports "Permission
1635 denied" instead of "permission denied". The old behavior was problematic
1636 in languages like German where downcasing rules depend on grammar.
1639 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1640 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1641 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1642 and apostrophe `like this'. The default value nil acts like ‘curve’
1643 if curved single quotes are displayable, and like ‘grave’ otherwise.
1644 The new variable affects display of diagnostics and help, but not of info.
1647 ** substitute-command-keys now replaces quotes.
1648 That is, it converts documentation strings’ quoting style as per the
1649 value of ‘text-quoting-style’. Doc strings in source code can use
1650 either curved single quotes or grave accents and apostrophes. As
1651 before, characters preceded by \= are output as-is.
1654 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1655 They use the new ‘format-message’ function instead of plain ‘format’,
1656 so that they now follow user preference as per ‘text-quoting-style’
1657 when processing curved single quotes, grave accents, and apostrophes
1658 in their format argument.
1661 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1662 now match multibyte characters using Unicode character properties.
1663 If you want the old behavior where they matched any character with
1664 word syntax, use `\sw' instead.
1667 ** The character classes [:graph:] and [:print:] in regular expressions
1668 no longer match every multibyte character. Instead, Emacs now
1669 consults the Unicode character properties to determine which
1670 characters are graphic or printable. In particular, surrogates and
1671 unassigned codepoints are now rejected. If you want the old behavior,
1672 use [:multibyte:] instead.
1675 ** The `diff' command uses the unified format now. To restore the old
1676 behavior, set `diff-switches' to `-c'.
1679 ** `grep-template' and `grep-find-template' values don't include the
1680 --color argument anymore. It's added at the <C> place holder position
1681 dynamically. Any third-party code that changes these templates should
1682 be updated accordingly.
1684 ** The grep/rgrep/lgrep functions will now ask about saving files
1685 before running. This is controlled by the `grep-save-buffers'
1689 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1690 The new behavior is compatible with Common Lisp and with XEmacs.
1691 This change does not affect Lisp code intended to be portable to
1692 Emacs 24.2 and earlier, which did not support unary ‘/’.
1695 ** The `default-directory' value doesn't have to end slash. To make
1696 that happen, `unhandled-file-name-directory' now defaults to calling
1697 `file-name-as-directory'.
1700 * Lisp Changes in Emacs 25.1
1704 *** New UPatterns `quote', `app'.
1706 *** New UPatterns can be defined with `pcase-defmacro'.
1708 *** New vector QPattern.
1711 ** syntax-propertize is now automatically called on-demand during forward
1712 parsing functions like `forward-sexp'.
1715 ** New hooks `prefix-command-echo-keystrokes-functions' and
1716 `prefix-command-preserve-state-hook' allow the definition of prefix
1717 commands other than the predefined `C-u'.
1720 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1721 These allow conversion between buffer positions and the corresponding
1722 file byte offsets, given the file's encoding.
1725 ** The default value of `load-read-function' is now `read'.
1726 Previously, the default value of `nil' implied using `read'.
1729 ** New hook `pre-redisplay-functions'.
1730 It is a bit easier to use than `pre-redisplay-function'.
1733 ** The second arg of `looking-back' should always be provided explicitly.
1734 Previously, it was an optional argument, now it's mandatory.
1737 ** Text properties `intangible', `point-entered', and `point-left' are obsolete.
1738 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1739 implemented by the new `cursor-intangible-mode' and
1740 `cursor-sensor-mode' minor modes.
1743 ** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
1744 Use the new minor modes `cursor-intangible-mode' and
1745 `cursor-sensor-mode' instead.
1748 ** New process type `pipe', which can be used in combination with the
1749 `:stderr' keyword of make-process to handle standard error output
1753 ** New function `make-process' provides an alternative interface to
1754 `start-process'. It allows programs to set process parameters such as
1755 process filter, sentinel, etc., through keyword arguments (similar to
1756 `make-network-process').
1759 ** A new function `directory-files-recursively' returns all matching
1760 files (recursively) under a directory.
1763 ** New variable `inhibit-message', when bound to non-nil, inhibits
1764 `message' and related functions from displaying messages in the echo
1765 area. The output is still logged to the *Messages* buffer.
1768 ** A new text property `inhibit-read-only' can be used in read-only
1769 buffers to allow certain parts of the text to be writable.
1772 ** A new variable `comment-end-can-be-escaped' is useful in languages
1773 such as C and C++ where line comments with escaped newlines are
1774 continued to the next line.
1777 ** New macro `define-advice'.
1780 ** Emacs Lisp now supports generators.
1781 See the "Generators" section of the ELisp manual for the details.
1784 ** New finalizer facility for running code when objects become unreachable.
1785 See the "Finalizer Type" subsection in the ELisp manual for the
1789 ** lexical closures can use (:documentation FORM) to build their docstring.
1790 It should be placed right where the docstring would be, and FORM is then
1791 evaluated (and should return a string) when the closure is built.
1794 ** The new command `fortune-message' has been added, which displays
1795 fortunes in the echo area.
1798 ** define-inline provides a new way to define inlinable functions.
1801 ** New function `macroexpand-1' to perform a single step of macro expansion.
1804 ** Some "x-*" functions were obsoleted and/or renamed:
1805 *** x-select-text is renamed gui-select-text.
1806 *** x-selection-value is renamed gui-selection-value.
1807 *** x-get-selection is renamed gui-get-selection.
1808 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1809 *** x-get-selection-value is renamed to gui-get-primary-selection.
1810 *** x-set-selection is renamed to gui-set-selection
1813 ** New function `string-greaterp', which return the opposite result of
1817 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1818 preserve the collation order as defined by the system's locale(1)
1819 environment. For the time being this is implemented for modern POSIX
1820 systems and for MS-Windows, for other systems they fall back to their
1821 counterparts `string-lessp' and `string-equal'.
1824 ** The new function `string-version-lessp' compares strings by
1825 interpreting consecutive runs of numerical characters as numbers, and
1826 compares their numerical values. According to this predicate,
1827 "foo2.png" is smaller than "foo12.png".
1830 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1831 The effect is that, on systems that use ls-lisp for Dired, the default
1832 sort order of the files in Dired is now different from what it was in
1833 previous versions of Emacs. In particular, the file names are sorted
1834 disregarding punctuation, accents, and diacritics, and letter case is
1835 ignored. For example, files whose name begin with a period will no
1836 longer appear near the beginning of the directory listing. If you
1837 want the old, locale-independent sorting, customize the new option
1838 `ls-lisp-use-string-collate' to the nil value.
1841 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1842 if set to a non-nil value, causes the above 2 functions to ignore
1843 symbol and punctuation characters when collating strings. This
1844 emulates the behavior of modern Posix platforms when the locale's
1845 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1846 MS-Windows doesn't support UTF-8 as codeset in its locales.
1849 ** New function `alist-get', which is also a valid place (aka lvalue).
1852 ** New function `funcall-interactively', which works like `funcall'
1853 but makes `called-interactively-p' treat the function as (you guessed it)
1854 called interactively.
1857 ** New function `function-put' to use instead of `put' for function properties.
1860 ** The new function `bidi-find-overridden-directionality' allows you to
1861 find characters whose directionality was, perhaps maliciously,
1862 overridden by directional override control characters. Lisp programs
1863 can use this to detect potential phishing of URLs and other links that
1864 exploits bidirectional display reordering.
1867 ** The new function `buffer-substring-with-bidi-context' allows you to
1868 copy a portion of a buffer into a different location while preserving
1869 the visual appearance both of the copied text and the text at
1870 destination, even when the copied text includes mixed bidirectional
1871 text and directional control characters.
1874 ** New properties that can be specified with `declare':
1875 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1876 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1877 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1881 ** New macro `with-file-modes', for evaluating expressions with default file
1882 permissions set to temporary values (e.g., for creating private files).
1885 ** You can access the slots of structures using `cl-struct-slot-value'.
1888 ** Function `sort' can deal with vectors.
1891 ** Function `system-name' now returns an updated value if the current
1892 system's name has changed or if the Emacs process has changed systems,
1893 and to avoid long waits it no longer consults DNS to canonicalize the
1894 name. The variable `system-name' is now obsolete.
1897 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1900 ** If `pwd' is called with a prefix argument, insert the current default
1904 ** New functions return extended information about fonts and faces.
1907 *** The function `font-info' now returns more details about a font.
1908 In particular, it now returns the average width of the font's
1909 characters, which can be used for geometry-related calculations.
1912 *** A new function `default-font-width' returns the average width of a
1913 character in the current buffer's default font. If the default face
1914 is remapped (see `face-remapping-alist'), the value for the remapped
1915 face is returned. This function complements the existing function
1916 `default-font-height'.
1919 *** New functions `window-font-height' and `window-font-width' return
1920 the height and average width of characters in a specified face and
1921 window. If FACE is remapped (see `face-remapping-alist'), the
1922 function returns the information for the remapped face.
1925 *** A new function `window-max-chars-per-line' returns the maximal
1926 number of characters that can be displayed on one line. If a face
1927 and/or window are provided, these values are used for the
1928 calculation. This function is different from `window-body-width' in
1929 that it accounts for (i) continuation glyphs, (ii) the size of the
1930 font, and (iii) the specified window.
1933 ** New utilities in subr-x.el:
1934 *** New macros `if-let' and `when-let' allow defining bindings and to
1935 execute code depending whether all values are true.
1936 *** New macros `thread-first' and `thread-last' allow threading a form
1937 as the first or last argument of subsequent forms.
1940 ** Documentation strings now support quoting with curved single quotes
1941 ‘like-this’ in addition to the old style with grave accent and
1942 apostrophe `like-this'. The new style looks better on today's displays.
1943 In the new Electric Quote mode, you can enter curved single quotes
1944 into documentation by typing ` and '. Outside Electric Quote mode,
1945 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1946 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1947 ‘text-quoting-style’, the user can specify how to display doc string
1951 ** New function ‘format-message’ is like ‘format’ and also converts
1952 curved single quotes, grave accents and apostrophes as per
1953 ‘text-quoting-style’.
1956 ** show-help-function's arg is converted via substitute-command-keys
1957 before being passed to the function. Help strings, help-echo
1958 properties, etc. can therefore contain command key escapes and
1962 ** Time-related changes:
1964 *** Time conversion functions now accept an optional ZONE argument
1965 that specifies the time zone rules for conversion. ZONE is omitted or
1966 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1967 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1968 rule. The affected functions are ‘current-time-string’,
1969 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1970 function ‘encode-time’, which already accepted a simple time zone rule
1971 argument, has been extended to accept all the new forms.
1973 *** Time-related functions now consistently accept numbers
1974 (representing seconds since the epoch) and nil (representing the
1975 current time) as well as the usual list-of-integer representation.
1976 Affected functions include `current-time-string', `current-time-zone',
1977 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1978 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1979 `time-to-days', and `time-to-seconds'.
1981 *** The `encode-time-value' and `with-decoded-time-value' macros have
1984 *** `calendar-next-time-zone-transition', `time-add', and
1985 `time-subtract' no longer return time values in the obsolete and
1986 undocumented integer-pair format. Instead, they return a list of two
1990 ** New function `set-binary-mode' allows switching a standard stream
1991 of the Emacs process to binary I/O mode.
1994 ** The new function `directory-name-p' can be used to check whether a file
1995 name (as returned from, for instance, `file-name-all-completions') is
1996 a directory file name. It returns non-nil if the last character in
1997 the name is a directory separator character (forward slash on GNU and
1998 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2001 ** ASCII approximations to curved quotes are put in standard-display-table
2002 if the terminal cannot display curved quotes.
2005 ** Standard output and error streams now transliterate characters via
2006 standard-display-table, and encode output using locale-coding-system.
2007 To force a specific encoding, bind `coding-system-for-write' to the
2008 coding-system of your choice when invoking functions like `prin1' and
2012 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
2015 ** New possible value for `system-type': `nacl'.
2016 This is used by Google's Native Client (NaCl).
2019 ** `read-color' will now display the color names using the color itself
2020 as the background color.
2023 ** There is now a new variable `flyspell-sort-corrections-function'
2024 that allows changing the way corrections are sorted.
2026 ** Miscellaneous name change
2029 For consistency with the usual Emacs spelling, the Lisp variable
2030 `hfy-optimisations' has been renamed to `hfy-optimizations'.
2031 The old name should still work, as an obsolescent alias.
2033 ** Changes in Frame- and Window- Handling
2036 *** Emacs can now draw horizontal scroll bars on some platforms that
2037 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2038 Horizontal scroll bars are turned off by default.
2040 **** New function `horizontal-scroll-bars-available-p' telling whether
2041 horizontal scroll bars are available on the underlying system.
2043 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
2044 bars on all existing and future frames.
2046 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
2047 scroll bars on the selected frame.
2049 **** New frame parameters `horizontal-scroll-bars' and
2050 `scroll-bar-height' to set horizontal scroll bars and their height
2051 for individual frames and in `default-frame-alist'.
2053 **** New functions `frame-scroll-bar-height' and
2054 `window-scroll-bar-height' return the height of horizontal scroll
2055 bars on a specific frame or window.
2057 **** `set-window-scroll-bars' now accepts five parameters where the last
2058 two specify height and type of the window's horizontal scroll bar.
2060 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
2063 **** New buffer-local variables `horizontal-scroll-bar' and
2064 `scroll-bar-height'.
2067 *** New functions `frame-geometry' and `frame-edges' give access to a
2071 *** New functions `mouse-absolute-pixel-position' and
2072 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
2076 *** The function `window-edges' now accepts three additional arguments to
2077 retrieve body, absolute and pixel edges of the window.
2080 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
2081 `window-inside-absolute-pixel-edges' have been renamed to respectively
2082 `window-body-edges', `window-body-pixel-edges' and
2083 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
2086 *** New function `window-absolute-pixel-position' to get the screen
2087 coordinates of a visible buffer position.
2090 *** The height of a frame's menu and tool bar are no longer counted in the
2091 frame's text height. This means that the text height stands only for
2092 the height of the frame's root window plus that of the echo area (if
2093 present). This was already the behavior for frames with external tool
2094 and menu bars (like in the Gtk builds) but has now been extended to all
2098 *** Frames now do not necessarily preserve the number of columns or lines
2099 they display when setting default font, menu bar, fringe width, or
2100 scroll bars. In particular, maximized and fullscreen frames are
2101 conceptually never resized if such settings change. For fullheight and
2102 fullwidth frames, the behavior may depend on the toolkit used.
2103 **** New option `frame-inhibit-implied-resize' if non-nil, means that
2104 setting default font, menu bar, fringe width, or scroll bars of a
2105 specific frame does not resize that frame in order to preserve the
2106 number of columns or lines it displays.
2109 *** New function `window-preserve-size' allows you to preserve the size of
2110 a window without "fixing" it. It's supported by `fit-window-to-buffer',
2111 `temp-buffer-resize-mode' and `display-buffer'.
2114 *** New `display-buffer' action function `display-buffer-use-some-frame'.
2115 This displays the buffer in an existing frame other than the current
2116 frame, and allows the caller to specify a frame predicate to exclude
2120 *** New minor mode `window-divider-mode' and options
2121 `window-divider-default-places', `window-divider-default-bottom-width'
2122 and `window-divider-default-right-width'.
2125 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2126 Those features have been deprecated in Gtk+ for a long time.
2131 *** etags no longer qualifies class members by default.
2133 By default, `etags' will not qualify class members for C-like
2134 object-oriented languages with their class names and namespaces, and
2135 will remove qualifications used explicitly in the code from the tag
2136 names it puts in TAGS files. This is so the etags.el back-end for
2137 `xref-find-definitions' is more accurate and produces less false
2140 Use --class-qualify (-Q) if you want the old default behavior of
2141 qualifying class members in C++, Java, and Objective C. Note that
2142 using -Q might make some class members become "unknown" to `M-.'
2143 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
2144 qualified names by hand.
2147 *** New language Ruby
2149 Names of modules, classes, methods, functions, and constants are
2150 tagged. Overloaded operators are also tagged.
2154 Names of packages, functions, and types are tagged.
2157 *** Improved support for Lua
2159 Etags now tags functions even if the "function" keyword follows some
2160 whitespace at line beginning.
2163 * Changes in Emacs 25.1 on Non-Free Operating Systems
2166 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2167 This includes the makefile.w32-in files in various subdirectories, and
2168 the support files. The file nt/configure.bat now just tells the user
2169 to use the procedure described in nt/INSTALL, by running the Posix
2170 `configure' script in the top-level directory.
2173 ** Building Emacs for MS-Windows requires at least Windows XP
2174 or Windows Server 2003. The built binaries still run on all versions
2175 of Windows starting with Windows 9X.
2178 ** Emacs running on MS-Windows now supports the daemon mode.
2181 ** The byte counts in etags-generated TAGS files are now the same on
2182 MS-Windows as they are on other platforms.
2185 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2186 Pass '--without-ns' to configure to create an X11 build, the old default.
2189 ** OS X 10.5 or older is no longer supported.
2192 ** OS X on PowerPC is no longer supported.
2195 ** New variable `ns-use-fullscreen-animation' controls animation for
2196 non-native NS fullscreen. The default is nil. Set to t to enable
2197 animation when entering and leaving fullscreen. For native OSX fullscreen
2201 ** The new function 'w32-application-type' returns the type of an
2202 MS-Windows application given the name of its executable program file.
2204 ** New variable `w32-pipe-buffer-size'.
2205 It can be used to tune the size of the buffer of pipes created for
2206 communicating with subprocesses, when the program run by a subprocess
2207 exhibits unusual buffering behavior. Default is zero, which lets the
2208 OS use its default size.
2211 ----------------------------------------------------------------------
2212 This file is part of GNU Emacs.
2214 GNU Emacs is free software: you can redistribute it and/or modify
2215 it under the terms of the GNU General Public License as published by
2216 the Free Software Foundation, either version 3 of the License, or
2217 (at your option) any later version.
2219 GNU Emacs is distributed in the hope that it will be useful,
2220 but WITHOUT ANY WARRANTY; without even the implied warranty of
2221 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2222 GNU General Public License for more details.
2224 You should have received a copy of the GNU General Public License
2225 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2231 paragraph-separate: "[
\f]*$"