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 ** The networking code has been reworked so that it's more
36 asynchronous than it was (when specifying :nowait t in
37 `make-network-process'). How asynchronous it is varies based on the
38 capabilities of the system, but on a typical GNU/Linux system the DNS
39 resolution, the connection, and (for TLS streams) the TLS negotiation
40 are all done without blocking the main Emacs thread. To get
41 asynchronous TLS, the TLS boot parameters have to be passed in (see
42 the manual for details).
44 Certain process oriented functions (like `process-datagram-address')
45 will block until socket setup has been performed. The recommended way
46 to deal with asynchronous sockets is to avoid interacting with them
47 until they have changed status to "run". This is most easily done
48 from a process sentinel.
50 ** It is possible to disable attempted recovery on fatal signals
52 Two new variables allow to disable attempts to recover from stack
53 overflow and to avoid automatic auto-save when Emacs is delivered a
54 fatal signal. `attempt-stack-overflow-recovery', if set to `nil',
55 will disable attempts to recover from C stack overflows; Emacs will
56 then crash as with any other fatal signal.
57 `attempt-orderly-shutdown-on-fatal-signal', if set to `nil', will
58 disable attempts to auto-save the session and shut down in an orderly
59 fashion when Emacs receives a fatal signal; instead, Emacs will
60 terminate immediately. Both variables are non-`nil' by default.
61 These variables are for users who would like to avoid the small
62 probability of data corruption due to techniques Emacs uses to recover
66 * Editing Changes in Emacs 25.2
69 * Changes in Specialized Modes and Packages in Emacs 25.2
74 *** A new `s' command for switching to another eww buffer via the minibuffer.
77 ** The commands that add ChangeLog entries now prefer a VCS root directory
78 for the ChangeLog file, if none already exists. Customize
79 `change-log-directory-files' to nil for the old behavior.
82 ** Support for non-string values of `time-stamp-format' has been removed.
87 *** New connection method "sg", which allows to edit files under
91 *** New connection method "doas" for OpenBSD hosts.
94 * New Modes and Packages in Emacs 25.2
97 * Incompatible Lisp Changes in Emacs 25.2
100 ** Resizing a frame no longer runs `window-configuration-change-hook'.
101 Put your function on `window-size-change-functions' instead.
104 * Lisp Changes in Emacs 25.2
106 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
108 ** Autoload files can be generated without timestamps,
109 by setting `autoload-timestamps' to nil.
111 ** `ert-with-function-mocked' of 'ert-x package allows mocking of functions
115 ** New functions `window-pixel-width-before-size-change' and
116 `window-pixel-height-before-size-change' allow to detect which window
117 changed size when `window-size-change-functions' are run.
120 * Changes in Emacs 25.2 on Non-Free Operating Systems
123 * Installation Changes in Emacs 25.1
126 ** Building Emacs now requires C99 or later.
129 ** Building Emacs now requires GNU make, version 3.81 or later.
132 ** New configure option --with-cairo.
133 This builds Emacs with Cairo drawing. As a side effect, it provides
134 support for built-in printing, when Emacs was built with GTK+.
135 Cairo drawing is an experimental feature in Emacs, and subject to
136 change in future releases.
139 ** New configure option --with-modules.
140 This enables support for loading dynamic modules; see below.
143 ** By default, Emacs no longer works on IRIX. We expect that Emacs
144 users are not affected by this, as SGI stopped supporting IRIX in
145 December 2013. If you are affected, please send a bug report. You
146 should be able to work around the problem either by porting the Emacs
147 undumping code to GCC under IRIX, or by configuring --with-wide-int,
148 or by sticking with Emacs 24.4.
151 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
152 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
153 since Emacs 24.4, and the other variants were undocumented and were
154 obstacles to maintenance and development. GC_MARK_STACK and its
155 related symbols have been removed from the C internals.
158 ** 'configure' now prefers gnustep-config when configuring GNUstep.
159 If gnustep-config is not available, the old heuristics are used.
162 ** 'configure' now prefers inotify to gfile for file notification,
163 unless gfile is explicitly requested via --with-file-notification='gfile'.
166 ** 'configure' detects the kqueue file notification library on *BSD
167 and Mac OS X machines.
170 ** The configure option '--with-pkg-config-prog' has been removed.
171 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
174 ** The configure option '--with-mmdf' has been removed.
175 It was no longer useful, as it relied on libraries that are no longer
176 supported, and its presence led to confusion during configuration.
177 This affects only the 'movemail' utility; Emacs itself can still
178 process MMDF-format files as before.
181 ** The configure option '--enable-silent-rules' is now the default,
182 and silent rules are now quieter. To get the old behavior where
183 'make' chatters a lot, configure with '--disable-silent-rules' or
184 build with 'make V=1'.
187 ** The configure option '--with-gameuser' now allows you to specify a
188 group instead of a user if its argument is prefixed by ':' (a colon).
189 This will cause the game score files in ${localstatedir}/games/emacs
190 to be owned by that group, and the helper program for updating them to
191 be installed setgid. The option now defaults to the 'games' group.
194 ** The `grep-changelog' script (and its manual page) are no longer included.
195 It has no particular connection to Emacs and has not changed in years,
196 so if you want to use it, you can always take a copy from an older Emacs.
199 ** Emacs 25 comes with a new set of icons.
200 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
201 The old Emacs logo icons are available as `emacs23.png' in the same location.
204 ** New make target `check-expensive' to run additional tests.
205 This includes all tests which run via "make check", plus additional
206 tests which take more time to perform.
209 * Startup Changes in Emacs 25.1
212 ** When Emacs is given a file as a command line argument and
213 `initial-buffer-choice' is non-nil, display both the file and
214 `initial-buffer-choice'. When Emacs is given more than one file and
215 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
216 and *Buffer List*. This makes Emacs convenient to use from the
217 command line when `initial-buffer-choice' is non-nil.
220 ** The value of ‘initial-scratch-message’ is now treated as a doc string
221 and can contain escape sequences for command keys, quotes, and the like.
224 * Changes in Emacs 25.1
227 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
228 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
229 xwidget support, you can access the embedded webkit browser with `M-x
230 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
231 browser. The buffer will have a new mode, `xwidget-webkit-mode'
232 (similar to `image-mode'), which supports the webkit widget.
235 *** New functions for xwidget-webkit mode `xwidget-webkit-insert-string',
236 `xwidget-webkit-adjust-size-dispatch', `xwidget-webkit-back',
237 `xwidget-webkit-browse-url', `xwidget-webkit-reload',
238 `xwidget-webkit-current-url', `xwidget-webkit-scroll-backward',
239 `xwidget-webkit-scroll-forward', `xwidget-webkit-scroll-down',
240 `xwidget-webkit-scroll-up'.
243 ** Emacs can now load shared/dynamic libraries (modules).
244 A dynamic Emacs module is a shared library that provides additional
245 functionality for use in Emacs Lisp programs, just like a package
246 written in Emacs Lisp would. The functions `load', `require',
247 `load-file', etc. were extended to load such modules, as they do with
248 Emacs Lisp packages. The new variable `module-file-suffix' holds the
249 system-dependent value of the file-name extension (`.so' on Posix
250 hosts) of the module files.
252 A module should export a C-callable function named
253 `emacs_module_init', which Emacs will call as part of the call to
254 `load' or `require' which loads the module. It should also export a
255 symbol named `plugin_is_GPL_compatible' to indicate that its code is
256 released under the GPL or compatible license; Emacs will refuse to
257 load modules that don't export such a symbol.
259 If a module needs to call Emacs functions, it should do so through the
260 API defined and documented in the header file `emacs-module.h'. Note
261 that any module that provides Lisp-callable functions will have to use
262 Emacs functions such as `fset' and `funcall', in order to register its
263 functions with the Emacs Lisp interpreter.
265 Modules can create `user-ptr' Lisp objects that embed pointers to C
266 struct's defined by the module. This is useful for keeping around
267 complex data structures created by a module, to be passed back to the
268 module's functions. User-ptr objects can also have associated
269 "finalizers" -- functions to be run when the object is GC'ed; this is
270 useful for freeing any resources allocated for the underlying data
271 structure, such as memory, open file descriptors, etc. A new
272 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
275 Loadable modules in Emacs are an experimental feature, and subject to
276 change in future releases. For that reason, their support is disabled
277 by default, and must be enabled by using the `--with-modules' option
281 ** A second dir-local file (.dir-locals-2.el) is now accepted.
282 See the variable `dir-locals-file-2' for more information.
285 ** Network security (TLS/SSL certificate validity and the like) is
286 added via the new Network Security Manager (NSM) and controlled via
287 the `network-security-level' variable.
290 ** International domain names (IDNA) are now encoded via the new
291 puny.el library, so that one can visit web sites like
292 "http://méxico.icom.museum".
295 ** C-h l now also lists the commands that were run.
297 ** The new M-s M-w key binding uses eww to search the web for the
301 ** The new `timer-list' command lists all active timers in a buffer
302 where you can cancel them with the `c' command.
304 ** M-x suggests shorthands and ignores obsolete commands for completion.
305 ** x-select-enable-clipboard is renamed select-enable-clipboard.
306 x-select-enable-primary and renamed select-enable-primary.
307 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
308 name it), with the proviso that on some systems (e.g. Windows)
309 select-enable-primary is ineffective since the system doesn't
310 have the equivalent of a primary selection.
313 ** New option `switch-to-buffer-in-dedicated-window' allows you to
314 customize how `switch-to-buffer' proceeds interactively when the
315 selected window is strongly dedicated to its buffer.
318 ** The option `even-window-heights' has been renamed to
319 `even-window-sizes' and now handles window widths as well.
322 ** New function `read-multiple-choice' use to prompt for
323 multiple-choice questions, with a handy way to display help texts.
326 ** terpri gets an optional arg ENSURE to conditionally output a newline.
329 ** `insert-register' now leaves point after the inserted text
330 when called interactively. A prefix argument toggles this behavior.
333 ** The new variable `term-file-aliases' replaces some files from lisp/term.
334 The function `tty-run-terminal-initialization' consults this variable
335 when deciding what terminal-specific initialization code to run.
338 ** New variable `system-configuration-features', listing some of the
339 main features that Emacs was compiled with. This is mainly intended
340 for use in Emacs bug reports.
343 ** A password is now hidden also when typed in batch mode. Another
344 hiding character but the default `.' can be used by let-binding the
345 variable `read-hide-char'.
348 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
351 * Editing Changes in Emacs 25.1
354 ** M-x suggests shorthands and ignores obsolete commands for completion.
359 *** Successive single-char deletions are collapsed in the undo-log just like
360 successive char insertions. Which commands invoke this behavior is
361 controlled by the new `undo-auto-amalgamate' function. See the node
362 "Undo" in the ELisp manual for more details.
365 *** The heuristic used to insert `undo-boundary' after each command
366 has changed, so that if a command causes changes in more than just the
367 current buffer, Emacs now calls `undo-boundary' in every buffer
368 affected by the command.
371 ** New command `comment-line' bound to `C-x C-;'.
373 ** New and improved facilities for inserting Unicode characters
376 *** Unicode names entered via C-x 8 RET now use substring completion by default.
379 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
380 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
383 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
384 as you type. See also the new variable ‘text-quoting-style’.
387 ** New minor mode global-eldoc-mode is enabled by default.
390 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
391 Bracketed paste mode causes text terminals to wrap pasted text in special
392 escape sequences that allow Emacs to tell the difference between text
393 you type and text you paste from other applications. Emacs then
394 avoids interpreting each character in the pasted text as it does with
395 keyboard input, which results in a paste experience similar to that
396 under a window system, and significant performance improvements when
397 pasting large amounts of text.
399 Bracketed paste mode is disabled by default, so Emacs automatically
400 enables it at startup if the terminal supports it.
403 ** Emacs now supports the latest version of the UBA.
404 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
405 was updated to support all the latest additions and changes introduced
406 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
407 This includes full support for directional isolates and the
408 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
412 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
415 ** New buffer-local `electric-pair-local-mode'.
418 ** New variable `fast-but-imprecise-scrolling' inhibits
419 fontification during full screen scrolling operations, giving less
420 hesitant operation during auto-repeat of C-v, M-v at the cost of
421 possible inaccuracies in the end position.
424 ** New documentation command `describe-symbol'.
425 Works for functions, variables, faces, etc. It is bound to `C-h o' by
429 ** New function `custom-prompt-customize-unsaved-options' checks for
430 unsaved customizations and prompts user to customize (if found). It
431 is intended for adding to 'kill-emacs-query-functions'.
434 ** The old `C-x w' bindings in hi-lock-mode are officially deprecated
435 in favor of the global `M-s h' bindings introduced in Emacs-23.1.
436 They'll disappear soon.
439 ** New bindings for 'query-replace-map'.
440 `undo', undo the last replacement; bound to `u'.
441 `undo-all', undo all replacements; bound to `U'.
444 * Changes in Specialized Modes and Packages in Emacs 25.1
449 *** New command `checkdoc-package-keywords' checks if the
450 current package keywords are recognized. Set the new option
451 `checkdoc-package-keywords-flag' to non-nil to make
452 `checkdoc-current-buffer' call this function automatically.
455 *** New function `checkdoc-file' checks for style errors.
456 It's meant for use together with `compile':
457 emacs -batch --eval "(checkdoc-file \"subr.el\")"
462 *** The desktop format version has been upgraded from 206 to 208.
463 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
464 cannot read a version 208 desktop. To upgrade your desktop file, you
465 must explicitly request the upgrade, by C-u M-x desktop-save. You are
466 recommended to do this as soon as you have firmly upgraded to Emacs
467 25.1 (or later). Should you ever need to downgrade your desktop file
468 to version 206, you can do this with C-u C-u M-x desktop-save.
471 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
472 It raises an error if a bookmark of that name already exists,
473 unlike `bookmark-set' which silently updates an existing bookmark.
478 *** New user options `mm-html-inhibit-images' and `mm-html-blocked-images'
479 now control how mm-* functions fetch and display images in an HTML
480 message. Gnus still uses `gnus-inhibit-images' and `gnus-blocked-images'
481 for that purpose, i.e., binds mm-html- variables with those gnus-
482 variables, but other packages do not have to bind gnus- variables now.
485 *** `mm-inline-text-html-with-images' has been removed.
486 Use `mm-html-inhibit-images' instead. Note that the value is opposite
492 *** `imap-ssl-program' has been removed, and imap.el uses the internal
493 GnuTLS encryption functions if possible.
498 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
499 the ordering of object keys by default.
502 *** New commands `json-pretty-print-ordered' and
503 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
504 object keys sorted alphabetically.
507 ** Prog mode has some support for multi-mode indentation.
508 This allows better indentation support in modes that support multiple
509 programming languages in the same buffer, like literate programming
510 environments or ANTLR programs with embedded Python code.
512 A major mode can provide indentation context for a sub-mode through
513 the `prog-indentation-context' variable. To support this, modes that
514 provide indentation should use `prog-widen' instead of `widen' and
515 `prog-first-column' instead of a literal zero. See the node
516 "Mode-Specific Indent" in the ELisp manual for more details.
518 ** Prettify Symbols mode
521 *** Prettify Symbols mode supports custom composition predicates. By
522 overriding the default `prettify-symbols-compose-predicate', modes can
523 specify in which contexts a symbol may be displayed as some Unicode
524 character. `prettify-symbols-default-compose-p' is the default which
525 is suitable for most programming languages such as C or Lisp (but not
529 *** Symbols can be unprettified while point is inside them.
530 New variable `prettify-symbols-unprettify-at-point' configures this.
532 ** Enhanced xterm support
535 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
536 This variable tells Emacs which advanced capabilities are available in
537 the xterm terminal emulator used to display Emacs text-mode frames.
538 The default is to check each capability, and use it if available.
539 (This variable was introduced in Emacs 24.1, but was not announced in
543 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
544 in the surrounding GUI (using the OSC-52 escape sequence). This only works
545 if your xterm supports it and enables the `allowWindowOps' options (disabled
546 by default at least in Debian, for security reasons).
548 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
549 escape sequence) if your xterm has the feature enabled but for that you
550 additionally need to add `getSelection' to `xterm-extra-capabilities'.
553 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
556 ** The `save-place' variable is replaced by `save-place-mode'.
561 *** ERC can now hide message types by network or channel.
562 `erc-hide-list' will hide all messages of the specified type, while
563 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
564 specified message types for the respective specified targets.
566 *** New variable `erc-default-port-tls' used to connect to TLS IRC
570 *** Reconnection is now asynchronous.
573 *** Nick completion is now case-insensitive again after inadvertently
574 being made case-sensitive in Emacs 24.2.
579 *** New commands, key binds, and menu items.
581 **** `<' and `>' for navigating previous and next tracks in playlist
583 **** New play/pause command `mpc-toggle-play' bound to `s'
585 **** `g' bound to new command `mpc-seek-current' will navigate current
588 **** New commands `mpc-toggle-{consume,repeat,single,shuffle}' for
589 toggling playback modes.
592 *** Now supports connecting to a UNIX domain socket.
595 *** Looks at more image file names to use as album art.
596 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
597 (XP) in addition to cover.jpg.
600 *** Searches in more locations for MPD configuration files.
601 MPD supports the XDG base directory specification since version 0.17.6.
606 *** `midnight-mode' is now a proper minor mode.
609 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
614 *** New "external" package status.
615 An external package is any installed package that's not built-in and
616 not from `package-user-dir', which usually means it's from an entry in
617 `package-directory-list'. They are treated much like built-in
618 packages, in that they cannot be deleted through the package menu and
619 are not considered for upgrades.
621 The effect is that a user can manually place a specific version of a
622 package inside `package-directory-list' and the package menu will
626 *** If a package is available on multiple archives and one has higher
627 priority (as per `package-archive-priorities') only that one is
628 listed. This can be configured with `package-menu-hide-low-priority'.
631 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
632 This includes the above-mentioned low-priority packages, as well as
633 available packages whose version is lower than the currently installed
634 version (which were previously impossible to display).
635 This allows users to downgrade a package if a lower version is
639 *** When filtering the package menu, keywords starting with "arc:" or
640 "status:" represent package archive or status, respectively, instead
644 *** Most functions which involve downloading information now take an
645 ASYNC argument. If it is non-nil, package.el performs the download(s)
649 *** New variable `package-menu-async' controls whether the
650 package-menu uses asynchronous downloads.
653 *** `package-install-from-buffer' and `package-install-file' work on directories.
654 This follows the same rules as installing from a .tar file, except the
655 -pkg file is optional.
658 *** Packages which are dependencies of other packages cannot be deleted.
659 The FORCE argument to `package-delete' overrides this.
662 *** New custom variable `package-selected-packages' tracks packages
663 which were installed by the user (as opposed to installed as
664 dependencies). This variable can also be manually customized.
667 *** New command `package-install-selected-packages' installs all
668 packages from `package-selected-packages' which are currently missing.
671 *** New command `package-autoremove' removes all packages which were
672 installed strictly as dependencies but are no longer needed.
677 When you invoke `shell' interactively, the *shell* buffer will now
678 display in a new window. However, you can customize this behavior via
679 the `display-buffer-alist' variable. For example, to get
680 the old behavior -- *shell* buffer displays in current window -- use
681 (add-to-list 'display-buffer-alist
682 '("^\\*shell\\*$" . (display-buffer-same-window))).
686 *** The `:protection' slot option is not obeyed any more.
688 *** The `newname' argument to constructors is optional&deprecated.
689 If you need your objects to be named, do it by inheriting from `eieio-named'.
691 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
693 *** The <class> variables are declared obsolete.
695 *** The <initarg> variables are declared obsolete.
697 *** defgeneric and defmethod are declared obsolete.
698 Use the equivalent facilities from cl-generic.el instead.
700 *** `constructor' is now an obsolete alias for `make-instance'.
701 --- `pcase' accepts a new UPattern `eieio'.
706 *** New command `ido-bury-buffer-at-head' bound to C-S-b
707 Bury the buffer at the head of `ido-matches', analogous to how C-k
708 kills the buffer at head.
711 *** A prefix argument to `ido-restrict-to-matches' will reverse its
712 meaning, and the list is restricted to those elements that do not
713 match the current input.
718 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
719 The new commands `next-line-or-history-element' and
720 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
721 minibuffer, allow by-line movement through minibuffer history,
722 similarly to an ordinary buffer. Only when point moves over
723 the bottom/top of the minibuffer it goes to the next/previous history
724 element. `M-p' and `M-n' still move directly to previous/next history
727 ** Search and Replace
730 *** `isearch' and `query-replace' can now perform character folding in matches.
731 Isearch does that by default, while `query-replace' will do that if
732 the new variable `replace-character-fold' is customized to a non-nil
733 value. This is analogous to case folding, but instead of disregarding
734 case variants, it disregards wider classes of distinctions between
735 similar characters. (Case folding is a special case of character
736 folding.) This means many characters in the search string will match
737 entire groups of characters instead of just themselves.
739 For instance, the " will match all variants of double quotes (like “
740 and ”), and the letter a will match all of its accented cousins, even
741 those composed of multiple characters, as well as many other symbols
744 Character folding is enabled by customizing `search-default-mode' to
745 the value `character-fold-to-regexp'. If you want to turn character
746 folding off, customize the value of `search-default-mode' to the `nil'
747 value. You can also toggle character folding in the middle of a
748 search by typing `M-s ''.
751 *** New user option `search-default-mode'.
752 This option specifies the default mode for Isearch. The default
753 value, `character-fold-to-regexp' specifies that Isearch should fold
754 characters when searching.
757 *** New function `character-fold-to-regexp' can be used
758 by searching commands to produce a regexp matching anything that
759 character-folds into STRING.
762 *** The new M-s M-w key binding uses eww to search the web for the
763 text in the region. The search engine to use for this is specified by
764 the customizable variable `eww-search-prefix'.
767 *** Query-replace history is enhanced.
768 When query-replace reads the FROM string from the minibuffer, typing
769 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
770 and TO are the original text and its replacement, and SEP is an arrow
771 string defined by the new variable `query-replace-from-to-separator'.
772 To select a prior replacement, type `M-p' until the desired
773 replacement appears in the minibuffer, and then exit the minibuffer by
778 *** If `quick-calc' is called with a prefix argument, insert the
779 result of the calculation into the current buffer.
782 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
783 this you can tell Edebug not to stop at the start of the first
784 instrumented function.
789 *** New minor mode `global-eldoc-mode'
790 It is turned on by default, and affects `*scratch*' and other buffers
791 whose major mode supports Emacs Lisp.
794 *** `eldoc-documentation-function' now defaults to `ignore'
797 *** `describe-char-eldoc' displays information about character at point,
798 and can be used as a default value of `eldoc-documentation-function'. It is
799 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
800 ] [, ] [, etc.) while using mono-spaced font.
805 *** HTML can now be rendered using variable-width fonts.
808 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
809 whether to use variable-pitch fonts or not. The user can also
810 customize the `shr-use-fonts' variable.
813 *** A new command `C' (`eww-toggle-colors') can be used to toggle
814 whether to use the HTML-specified colors or not. The user can also
815 customize the `shr-use-colors' variable.
818 *** A new command `R' (`eww-readable') will try do identify the main
819 textual parts of a web page and display only that, leaving menus and
820 the like off the page.
823 *** Images that are being loaded are now marked with grey
824 "placeholder" images of the size specified by the HTML. They are then
825 replaced by the real images asynchronously, which will also now
826 respect width/height HTML specs (unless they specify widths/heights
827 bigger than the current window).
830 *** You can now use several eww buffers in parallel by renaming eww
831 buffers you want to keep separate.
834 *** Partial state of the eww buffers (the URIs and the titles of the
835 pages visited) is now preserved in the desktop file.
838 *** `eww-after-render-hook' is now called after eww has rendered
839 the data in the buffer.
842 *** The `eww-reload' command now takes a prefix to not reload via
843 the net, but just use the local copy of the HTML.
846 *** The DOM shr and eww uses has been changed to the general Emacs
847 xml.el/libxml2 DOM, and a new package dom.el has been added to
848 interact with this DOM. See the Emacs Lisp manual for interface
852 *** `mailcap-mime-data' is now consulted when displaying PDF files.
855 *** The new `S' command will list all eww buffers, and allow managing
859 *** https pages with valid certificates have headers marked in green, while
860 invalid certificates are marked in red.
865 *** text/html messages that contain inline image parts will be
866 transformed into multipart/related messages before sending.
869 *** The `message-valid-fqdn-regexp' variable has been removed, since
870 there are now top-level domains added all the time. Message will no
871 longer warn about sending emails to top-level domains it hasn't heard
874 *** `message-beginning-of-line' (bound to C-a) understands folded headers.
875 In `visual-line-mode' it will look for the true beginning of a header
876 while in non-`visual-line-mode' it will move the point to the indented
880 ** In Show Paren Mode, a parenthesis can be highlighted when point
881 stands inside it, and certain parens can be highlighted when point is
882 at BOL or EOL, or in whitespace there. To enable these, customize,
883 respectively, `show-paren-when-point-inside-paren' or
884 `show-paren-when-point-in-periphery'.
887 ** If gpg2 exists on the system, it is now used as the default value
888 of `epg-gpg-program' (instead of gpg).
893 *** Images are automatically scaled before displaying based on the
894 `image-scaling-factor' variable (if Emacs supports scaling the images
898 *** Images inserted with `insert-image' and related functions get a
899 keymap put into the text properties (or overlays) that span the
900 image. This keymap binds keystrokes for manipulating size and
901 rotation, as well as saving the image to a file.
904 *** A new library for creating and manipulating SVG images has been
905 added. See the "SVG Images" section in the lispref manual for
909 *** New setf-able function to access and set image parameters is
910 provided: `image-property'.
916 *** Strings after `:documentation' are highlighted as docstrings.
917 This enhances Lisp mode fontification to handle documentation of the
918 form `(:documentation "the doc string")' used in Common Lisp code for
919 CLOS class and slot documentation.
924 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
927 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
928 *** `string-rectangle' provides on-the-fly preview of the result.
931 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
932 These should be used in preference to `font-lock-fontify-buffer' when
936 ** Macro `minibuffer-with-setup-hook' can optionally append a function
937 to `minibuffer-setup-hook'.
939 If the first argument of the macro is of the form `(:append FUN)',
940 then FUN will be appended to `minibuffer-setup-hook', instead of
945 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
948 *** `pcase' accepts the new UPattern `cl-struct'.
950 ** Calendar and diary
953 *** The default `diary-file' is now located in .emacs.d.
956 *** New commands to insert diary entries with Chinese dates:
957 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
958 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
961 *** The calendar can now list and mark diary entries with Chinese dates.
962 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
965 *** The option `calendar-mode-line-format' can now be nil,
966 which means to do nothing special with the mode line in calendars.
969 *** New option `calendar-weekend-days'.
970 The option customizes which day headers receive the
971 `calendar-weekend-header' face.
974 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
977 *** Many items obsolete since at least version 23.1 have been removed.
978 The majority were function/variable/face aliases, too numerous to list here.
981 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
982 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
984 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
986 **** Macro `calendar-for-loop'.
988 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
990 **** The nil and list forms of `diary-display-function'.
993 ** New ERT function `ert-summarize-tests-batch-and-exit'.
994 If the output of ERT tests in batch mode execution can be saved to a
995 log file, then it can be passed as an argument to the above function
996 to produce a neat summary.
999 ** New js.el option `js-indent-first-init'.
1000 It was renamed from `js-indent-first-initialiser', to avoid issues
1001 with American vs British spelling.
1006 ** Info mode now displays symbol names in fixed-pitch font.
1007 If you want to get the old behavior back, customize the `Info-quoted'
1008 face to use the same definitions as the default face.
1011 *** `Info-fontify-maximum-menu-size' can be t for no limit.
1014 *** `info-display-manual' can now be given a prefix argument which (any
1015 non-nil value) directs the command to limit the completion
1016 alternatives to currently visited manuals.
1019 ** ntlm.el has support for NTLM2.
1024 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
1025 to delete or undelete multiple messages.
1028 *** Rmail can now render HTML mail messages if your Emacs was built with
1029 libxml2 or if you have the Lynx browser installed. By default, Rmail
1030 will display the HTML version of a mail message that has both HTML and
1031 plain text parts, if display of HTML email is possible; customize the
1032 `rmail-mime-prefer-html' option to `nil' if you don't want that.
1035 *** In the commands that make summaries by subject, recipients, or senders,
1036 you can no longer use commas to separate regular expressions.
1039 ** SES now supports local printer functions; see `ses-define-local-printer'.
1041 ** Shell-script Mode
1043 *** In sh-mode you can now use `sh-shell' as a file-local variable to
1044 specify the type of shell in use (bash, csh, etc).
1047 *** New value `always' for `sh-indent-after-continuation'.
1048 This provides old-style ("dumb") indentation of continued lines.
1049 See the doc string of `sh-indent-after-continuation' for details.
1053 *** Fatal TLS errors are now silent by default.
1056 *** If Emacs isn't built with TLS support, an external TLS-capable
1057 program is used instead. This program used to be run in --insecure
1058 mode by default, but has now changed to be secure instead, and will
1059 fail if you try to connect to non-verifiable hosts. This is
1060 controlled by the `tls-program' variable.
1065 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1066 When `url-handler-mode' is enabled, file operations for these
1067 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1070 *** The URL package allows customizing the `url-user-agent' string.
1071 The new `url-user-agent' variable can be customized to be a string or
1075 *** The new interface variable `url-request-noninteractive' can be used
1076 to specify that we're running in a noninteractive context, and that
1077 we should not be queried about things like TLS certificate validity.
1080 *** If URL is used with a https connection, the first callback argument
1081 plist will contain a :peer element that has the output of
1082 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
1085 *** The new function `url-cookie-delete-cookie' can be used to
1086 programmatically delete all cookies, or cookies from a specific
1092 *** New connection method "afp", which allows you to access Mac OS X
1093 volumes via the Apple Filing Protocol.
1096 *** New connection method "nc", which allows you to access dumb
1100 *** Method-specific parameters can be overwritten now with variable
1101 `tramp-connection-properties'.
1104 *** Handler for `file-notify-valid-p' for remote machines that support
1105 filesystem notifications.
1110 *** New user variable `sql-default-directory' enables remote
1111 connections using Tramp.
1114 *** New command `sql-send-line-and-next'.
1115 This command, bound to `C-c C-n' by default, sends the current line to
1116 the SQL process and advances to the next line, skipping whitespace and
1120 *** Added support for Vertica SQL.
1122 ** VC and related modes
1125 *** Basic push support, via `vc-push', bound to `C-x v P'.
1126 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1127 (undocumented) command vc-hg-push now behaves slightly differently.
1130 *** The new command vc-region-history shows the log+diff of the active region.
1133 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
1134 This command is useful when you perform version control commands
1135 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1136 back-end for the buffer's file, or remove it from version control.
1139 *** New option `vc-annotate-background-mode' controls whether
1140 the color range from `vc-annotate-color-map' is applied to the
1141 background or to the foreground.
1144 *** `compare-windows' now compares text with the most recently selected window
1145 instead of the next window. If you want the previous behavior of
1146 comparing with the next window, customize the new option
1147 `compare-windows-get-window-function' to the value
1148 `compare-windows-get-next-window'.
1151 *** Two new faces `compare-windows-removed' and `compare-windows-added'
1152 replace the face `compare-windows', which is now an obsolete alias for
1153 `compare-windows-added'.
1156 *** The VC state indicator in the mode line now has different faces
1157 corresponding to each of the possible states. See the `vc-faces'
1158 customization group.
1161 *** `log-edit-insert-changelog' converts "(tiny change)" to
1162 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
1163 nil to disable this.
1166 ** VHDL mode now supports VHDL'08.
1171 *** Decimal display mode uses "," groups, so it's more
1172 fitting for use in money calculations
1175 *** Factorial works with non-integer inputs.
1180 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1181 macro argument expansion, interactive macro evaluation and automatic
1182 scanning of #define'd symbols.
1185 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
1186 result of evaluating a macro.
1189 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
1190 all defined symbols in `hide-ifdef-env'.
1193 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
1194 file name patterns. Defaults to files whose extension is one of `.h',
1195 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
1198 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
1199 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1200 (This could happen when an idempotent header file is visited again,
1201 when its guard symbol is already defined.) Defaults to `t'.
1204 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
1205 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1206 looking for macro definitions. By default, no symbols are ignored.
1211 *** New custom variable `tex-print-file-extension' to help users who
1212 use PDF instead of DVI.
1215 *** TeX mode now supports Prettify Symbols mode. When enabling
1216 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1217 many other math macros are displayed using unicode characters.
1220 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
1221 By default, 32 consecutive spaces or four consecutive TABs are
1222 considered to be too deep, but the new variable
1223 `whitespace-big-indent-regexp' can be customized to change that.
1226 ** New options in `tildify-mode'.
1227 New options `tildify-space-string', `tildify-pattern', and
1228 `tildify-foreach-region-function' variables make
1229 `tildify-string-alist', `tildify-pattern-alist', and
1230 `tildify-ignored-environments-alist' variables (as well as a few
1231 helper functions) obsolete.
1234 ** New package Xref replaces Etags's front-end and UI
1236 The new package Xref provides a generic framework and new commands to
1237 find and move to definitions of functions, macros, data structures
1238 etc., as well as go back to the location where you were before moving
1239 to a definition. It supersedes and obsoletes many Etags commands,
1240 while still using the etags.el code that reads the TAGS tables as one
1243 The command `xref-find-definitions' replaces `find-tag' and provides
1244 an interface to pick one definition among several.
1245 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
1246 `pop-tag-mark', but has a keybinding (`M-,') different from the one
1247 `pop-tag-mark' used.
1249 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
1250 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1251 `xref-find-apropos' replaces `find-tag-regexp'.
1253 As a result of this, the following commands are now obsolete:
1254 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1257 `tags-loop-continue' is not obsolete because it's still useful in
1258 `tags-search' and `tags-query-replace', for which there are no direct
1262 *** Variants of `tags-search' and `tags-query-replace' in Dired were also
1263 replaced by xref-style commands, see the "Dired" section below.
1268 `find-tag-marker-ring-length' is now an obsolete alias for
1269 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1270 alias for a private variable. `xref-push-marker-stack' and
1271 `xref-pop-marker-stack' should be used instead to manipulate the stack
1272 of searches for definitions.
1275 *** `xref-find-definitions' and `describe-function' now display
1276 information about mode local overrides (defined by cedet/mode-local.el
1277 `define-overloadable-function' `define-mode-local-overrides').
1279 The framework's Lisp API is still experimental and can change in major,
1280 backward-incompatible ways.
1283 ** New package Project
1285 The new package Project provides generic infrastructure for dealing
1286 with projects. The main commands included in it are
1287 `project-find-file' and `project-find-regexp'.
1289 The Lisp API of this package is still experimental.
1292 EUDC's LDAP backend has been improved.
1295 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1298 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1299 subprocess instead of on the command line.
1302 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1303 need to configure this manually anymore.
1306 *** The LDAP configuration section of EUDC's manual has been
1309 There have also been customization changes.
1312 *** New custom variable `eudc-server-hotlist' to allow specifying
1313 multiple EUDC servers in init file.
1316 *** Custom variable `eudc-inline-query-format' defaults to completing
1317 on email and firstname instead of surname.
1320 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1321 to avoid interfering with the kill ring.
1324 *** Custom variable `eudc-inline-expansion-format' defaults to
1325 "Firstname Surname <mail-address>".
1328 *** Custom variable `eudc-options-file' defaults to
1329 "~/.emacs.d/eudc-options".
1332 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1333 allow overriding the regular expression that recognizes the ldapsearch
1334 command line's password prompt.
1337 EUDC's BBDB backend now supports BBDB 3.
1340 EUDC's PH backend (eudcb-ph.el) is obsolete.
1345 *** The new built-in command `clear' can scroll window contents out of sight.
1346 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1349 *** New buffer syntax '#<buffer-name>', which is equivalent to
1350 '#<buffer buffer-name>'. This shorthand makes interacting with
1351 buffers from eshell more convenient. Custom variable
1352 `eshell-buffer-shorthand', which has been broken for a while, has been
1356 *** By default, eshell "visual" program buffers (created by
1357 `eshell-visual-commands' and similar custom vars) are no longer killed
1358 when their processes die. This fixes issues with short-lived commands
1359 and makes visual programs more useful in general. For example, if
1360 "git log" is a visual command, it will always show the visual command
1361 buffer, even if the "git log" process dies. For the old behavior,
1362 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1367 *** Support for the Google Chrome web browser.
1370 *** Support for the Conkeror web browser.
1373 *** Support for several ancient browsers is now officially obsolete.
1376 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1377 be added to the archive.
1380 ** Autorevert: dired buffers are also auto-reverted via file
1381 notifications, if Emacs is compiled with file notification support.
1383 ** File Notifications
1386 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1389 *** The new event `stopped' signals, that a file notification watch is
1390 not active any longer.
1393 *** The new function `file-notify-valid-p' checks, whether a file
1394 notification descriptor still corresponds to an activate watch.
1399 *** The command `dired-do-compress' bound to `Z' now can compress
1400 directories and decompress zip files.
1403 *** New command `dired-do-compress-to' bound to `c' can be used to
1404 compress many marked files into a single named archive. The
1405 compression command is determined from the new
1406 `dired-compress-files-alist' variable.
1409 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1410 viewing HTML files and the like.
1412 *** New user interface for the `A' and `Q' commands.
1413 These keys, now bound to `dired-do-find-regexp' and
1414 `dired-do-find-regexp-and-replace', work similarly to `xref-find-apropos'
1415 and `xref-query-replace-in-results': they present the matches
1416 in the `*xref*' buffer and let you move through the matches. No need
1417 to use `tags-loop-continue' to resume the search or replace loop. The
1418 previous commands, `dired-do-search' and
1419 `dired-do-query-replace-regexp', are still available, but not bound to
1420 keys; rebind `A' and `Q' to invoke them if you want the old behavior
1421 back. We intend to obsolete the old commands in a future release.
1423 ** Tabulated List Mode
1426 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1427 call `tabulated-list-init-header', in which case it will have no
1431 *** `tabulated-list-print' takes a second optional argument, update,
1432 which specifies an alternative printing method which is faster when
1433 few or no entries have changed.
1435 ** Obsolete packages
1441 *** landmark.el (moved to elpa.gnu.org)
1444 * New Modes and Packages in Emacs 25.1
1447 ** pinentry.el allows GnuPG passphrase to be prompted through the
1448 minibuffer instead of a graphical dialog, depending on whether the gpg
1449 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1450 is set). This feature requires newer versions of GnuPG (2.1.5 or
1451 later) and Pinentry (0.9.5 or later). To use this feature, add
1452 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1453 configuration with "gpgconf --reload gpg-agent".
1456 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1457 The main entry points are `cl-defgeneric' and `cl-defmethod'. See the
1458 node "Generic Functions" in the Emacs Lisp manual for more details.
1461 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1462 SCSS (Sassy CSS) files.
1465 ** let-alist is a new macro (and a package) that allows one to easily
1466 let-bind the values stored in an alist.
1469 ** `tildify-mode' allows automatic insertion of hard spaces as one
1470 types the text. Breaking line after a single-character words is
1471 forbidden by Czech and Polish typography (and may be discouraged in
1472 other languages), so `auto-tildify-mode' makes it easier to create
1473 a typographically-correct documents.
1476 ** The `seq' library adds sequence manipulation functions and macros
1477 that complement basic functions provided by subr.el. All functions
1478 are prefixed with `seq-' and work on lists, strings and vectors.
1479 `pcase' accepts a new Upattern `seq'.
1482 ** The `map' library provides map-manipulation functions that work on
1483 alists, hash-table and arrays. All functions are prefixed with
1484 `map-'. `pcase' accepts a new UPattern `map'.
1487 ** The `thunk' library provides functions and macros to control the
1488 evaluation of forms.
1491 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1492 support for JSX, an XML-like syntax extension to ECMAScript.
1495 * Incompatible Lisp Changes in Emacs 25.1
1498 ** `setq' and `setf' must now be called with an even number of
1499 arguments. The earlier behavior of silently supplying a nil to the
1500 last variable when there was an odd number of arguments has been
1504 ** `syntax-begin-function' is declared obsolete.
1505 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1506 slot in font-lock-defaults.
1509 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1510 called during startup. Users who call this function in their init
1511 file and still expect it to be run after startup should set
1512 `package-enable-at-startup' to t after the call to
1513 `package-initialize'.
1516 ** `:global' minor mode use `setq-default' rather than `setq'.
1517 This means that you can't use `make-local-variable' and expect them to
1518 "magically" become buffer-local.
1521 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1522 The `track-mouse' form no longer refrains from changing the shape of
1523 the mouse pointer for the entire time the body of that form is
1524 executed. Lisp programs that use `track-mouse' for dragging across
1525 large portions of the Emacs display, and want to avoid changes in the
1526 pointer shape during dragging, should bind the variable `track-mouse'
1527 to the special value `dragging' in the body of the form.
1530 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1531 has any effect. (This change was made in Emacs 24.4 but was not
1532 advertised at the time.)
1535 ** `indirect-function' does not signal `void-function' any more.
1536 This is mostly a bug-fix, since this change was missed back in 24.4 when
1537 symbol-function was changed not to signal `void-function' any more.
1540 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1543 ** Comint, term, and compile do not set the EMACS env var any more.
1544 Use the INSIDE_EMACS environment variable instead.
1546 ** `C-up', `C-down', `C-left' and `C-right' are now defined in term
1547 mode to send the same escape sequences that xterm does. This makes
1548 things like forward-word in readline work.
1551 ** `save-excursion' does not save&restore the mark any more.
1552 Use `save-mark-and-excursion' if you want the old behavior.
1555 ** `read-buffer' and `read-buffer-function' can now be called with a 4th
1556 argument (`predicate').
1559 ** `completion-table-dynamic' by default stays in the minibuffer.
1560 The minibuffer will be the current buffer when the function is called.
1561 If you want the old behavior of calling the function in the buffer
1562 from which the minibuffer was entered, use the new argument
1563 `switch-buffer' to `completion-table-dynamic'.
1566 ** window-configurations no longer record the buffers' marks.
1569 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1570 active region handling.
1573 ** deactivate-mark is now buffer-local.
1576 ** `cl-the' now asserts that its argument is of the given type.
1579 ** `process-running-child-p' may now return a numeric process
1580 group ID instead of `t'.
1583 ** Mouse click events on mode line or header line no longer include
1584 any reference to a buffer position. The 6th member of the mouse
1585 position list returned for such events is now nil.
1588 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1589 These slots used to hold key-shortcut data, but have been obsolete since
1593 ** Emacs no longer downcases the first letter of a system diagnostic
1594 when signaling a file error. For example, it now reports "Permission
1595 denied" instead of "permission denied". The old behavior was problematic
1596 in languages like German where downcasing rules depend on grammar.
1599 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1600 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1601 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1602 and apostrophe `like this'. The default value nil acts like ‘curve’
1603 if curved single quotes are displayable, and like ‘grave’ otherwise.
1604 The new variable affects display of diagnostics and help, but not of info.
1607 ** substitute-command-keys now replaces quotes.
1608 That is, it converts documentation strings’ quoting style as per the
1609 value of ‘text-quoting-style’. Doc strings in source code can use
1610 either curved single quotes or grave accents and apostrophes. As
1611 before, characters preceded by \= are output as-is.
1614 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1615 They use the new ‘format-message’ function instead of plain ‘format’,
1616 so that they now follow user preference as per ‘text-quoting-style’
1617 when processing curved single quotes, grave accents, and apostrophes
1618 in their format argument.
1621 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1622 now match multibyte characters using Unicode character properties.
1623 If you want the old behavior where they matched any character with
1624 word syntax, use `\sw' instead.
1627 ** The character classes [:graph:] and [:print:] in regular expressions
1628 no longer match every multibyte character. Instead, Emacs now
1629 consults the Unicode character properties to determine which
1630 characters are graphic or printable. In particular, surrogates and
1631 unassigned codepoints are now rejected. If you want the old behavior,
1632 use [:multibyte:] instead.
1635 ** The `diff' command uses the unified format now. To restore the old
1636 behavior, set `diff-switches' to `-c'.
1639 ** `grep-template' and `grep-find-template' values don't include the
1640 --color argument anymore. It's added at the <C> place holder position
1641 dynamically. Any third-party code that changes these templates should
1642 be updated accordingly.
1645 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1646 The new behavior is compatible with Common Lisp and with XEmacs.
1647 This change does not affect Lisp code intended to be portable to
1648 Emacs 24.2 and earlier, which did not support unary ‘/’.
1651 ** The `default-directory' value doesn't have to end slash. To make
1652 that happen, `unhandled-file-name-directory' now defaults to calling
1653 `file-name-as-directory'.
1656 * Lisp Changes in Emacs 25.1
1660 *** New UPatterns `quote', `app'.
1662 *** New UPatterns can be defined with `pcase-defmacro'.
1664 *** New vector QPattern.
1667 ** syntax-propertize is now automatically called on-demand during forward
1668 parsing functions like `forward-sexp'.
1671 ** New hooks `prefix-command-echo-keystrokes-functions' and
1672 `prefix-command-preserve-state-hook' allow the definition of prefix
1673 commands other than the predefined `C-u'.
1676 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1677 These allow conversion between buffer positions and the corresponding
1678 file byte offsets, given the file's encoding.
1681 ** The default value of `load-read-function' is now `read'.
1682 Previously, the default value of `nil' implied using `read'.
1685 ** New hook `pre-redisplay-functions'.
1686 It is a bit easier to use than `pre-redisplay-function'.
1689 ** The second arg of `looking-back' should always be provided explicitly.
1690 Previously, it was an optional argument, now it's mandatory.
1693 ** Text properties `intangible', `point-entered', and `point-left' are obsolete.
1694 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1695 implemented by the new `cursor-intangible-mode' and
1696 `cursor-sensor-mode' minor modes.
1699 ** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
1700 Use the new minor modes `cursor-intangible-mode' and
1701 `cursor-sensor-mode' instead.
1704 ** New process type `pipe', which can be used in combination with the
1705 `:stderr' keyword of make-process to handle standard error output
1709 ** New function `make-process' provides an alternative interface to
1710 `start-process'. It allows programs to set process parameters such as
1711 process filter, sentinel, etc., through keyword arguments (similar to
1712 `make-network-process').
1715 ** A new function `directory-files-recursively' returns all matching
1716 files (recursively) under a directory.
1719 ** New variable `inhibit-message', when bound to non-nil, inhibits
1720 `message' and related functions from displaying messages in the echo
1721 area. The output is still logged to the *Messages* buffer.
1724 ** A new text property `inhibit-read-only' can be used in read-only
1725 buffers to allow certain parts of the text to be writable.
1728 ** A new variable `comment-end-can-be-escaped' is useful in languages
1729 such as C and C++ where line comments with escaped newlines are
1730 continued to the next line.
1733 ** New macro `define-advice'.
1736 ** Emacs Lisp now supports generators.
1737 See the "Generators" section of the ELisp manual for the details.
1740 ** New finalizer facility for running code when objects become unreachable.
1741 See the "Finalizer Type" subsection in the ELisp manual for the
1745 ** lexical closures can use (:documentation FORM) to build their docstring.
1746 It should be placed right where the docstring would be, and FORM is then
1747 evaluated (and should return a string) when the closure is built.
1750 ** define-inline provides a new way to define inlinable functions.
1753 ** New function `macroexpand-1' to perform a single step of macro expansion.
1756 ** Some "x-*" functions were obsoleted and/or renamed:
1757 *** x-select-text is renamed gui-select-text.
1758 *** x-selection-value is renamed gui-selection-value.
1759 *** x-get-selection is renamed gui-get-selection.
1760 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1761 *** x-get-selection-value is renamed to gui-get-primary-selection.
1762 *** x-set-selection is renamed to gui-set-selection
1765 ** New function `string-greaterp', which return the opposite result of
1769 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1770 preserve the collation order as defined by the system's locale(1)
1771 environment. For the time being this is implemented for modern POSIX
1772 systems and for MS-Windows, for other systems they fall back to their
1773 counterparts `string-lessp' and `string-equal'.
1776 ** The new function `string-version-lessp' compares strings by
1777 interpreting consecutive runs of numerical characters as numbers, and
1778 compares their numerical values. According to this predicate,
1779 "foo2.png" is smaller than "foo12.png".
1782 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1783 The effect is that, on systems that use ls-lisp for Dired, the default
1784 sort order of the files in Dired is now different from what it was in
1785 previous versions of Emacs. In particular, the file names are sorted
1786 disregarding punctuation, accents, and diacritics, and letter case is
1787 ignored. For example, files whose name begin with a period will no
1788 longer appear near the beginning of the directory listing. If you
1789 want the old, locale-independent sorting, customize the new option
1790 `ls-lisp-use-string-collate' to the nil value.
1793 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1794 if set to a non-nil value, causes the above 2 functions to ignore
1795 symbol and punctuation characters when collating strings. This
1796 emulates the behavior of modern Posix platforms when the locale's
1797 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1798 MS-Windows doesn't support UTF-8 as codeset in its locales.
1801 ** New function `alist-get', which is also a valid place (aka lvalue).
1804 ** New function `funcall-interactively', which works like `funcall'
1805 but makes `called-interactively-p' treat the function as (you guessed it)
1806 called interactively.
1809 ** New function `function-put' to use instead of `put' for function properties.
1812 ** The new function `bidi-find-overridden-directionality' allows you to
1813 find characters whose directionality was, perhaps maliciously,
1814 overridden by directional override control characters. Lisp programs
1815 can use this to detect potential phishing of URLs and other links that
1816 exploits bidirectional display reordering.
1819 ** The new function `buffer-substring-with-bidi-context' allows you to
1820 copy a portion of a buffer into a different location while preserving
1821 the visual appearance both of the copied text and the text at
1822 destination, even when the copied text includes mixed bidirectional
1823 text and directional control characters.
1826 ** New properties that can be specified with `declare':
1827 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1828 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1829 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1833 ** New macro `with-file-modes', for evaluating expressions with default file
1834 permissions set to temporary values (e.g., for creating private files).
1837 ** You can access the slots of structures using `cl-struct-slot-value'.
1840 ** Function `sort' can deal with vectors.
1843 ** Function `system-name' now returns an updated value if the current
1844 system's name has changed or if the Emacs process has changed systems,
1845 and to avoid long waits it no longer consults DNS to canonicalize the
1846 name. The variable `system-name' is now obsolete.
1849 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1852 ** If `pwd' is called with a prefix argument, insert the current default
1856 ** New functions return extended information about fonts and faces.
1859 *** The function `font-info' now returns more details about a font.
1860 In particular, it now returns the average width of the font's
1861 characters, which can be used for geometry-related calculations.
1864 *** A new function `default-font-width' returns the average width of a
1865 character in the current buffer's default font. If the default face
1866 is remapped (see `face-remapping-alist'), the value for the remapped
1867 face is returned. This function complements the existing function
1868 `default-font-height'.
1871 *** New functions `window-font-height' and `window-font-width' return
1872 the height and average width of characters in a specified face and
1873 window. If FACE is remapped (see `face-remapping-alist'), the
1874 function returns the information for the remapped face.
1877 *** A new function `window-max-chars-per-line' returns the maximal
1878 number of characters that can be displayed on one line. If a face
1879 and/or window are provided, these values are used for the
1880 calculation. This function is different from `window-body-width' in
1881 that it accounts for (i) continuation glyphs, (ii) the size of the
1882 font, and (iii) the specified window.
1885 ** New utilities in subr-x.el:
1886 *** New macros `if-let' and `when-let' allow defining bindings and to
1887 execute code depending whether all values are true.
1888 *** New macros `thread-first' and `thread-last' allow threading a form
1889 as the first or last argument of subsequent forms.
1892 ** Documentation strings now support quoting with curved single quotes
1893 ‘like-this’ in addition to the old style with grave accent and
1894 apostrophe `like-this'. The new style looks better on today's displays.
1895 In the new Electric Quote mode, you can enter curved single quotes
1896 into documentation by typing ` and '. Outside Electric Quote mode,
1897 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1898 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1899 ‘text-quoting-style’, the user can specify how to display doc string
1903 ** New function ‘format-message’ is like ‘format’ and also converts
1904 curved single quotes, grave accents and apostrophes as per
1905 ‘text-quoting-style’.
1908 ** show-help-function's arg is converted via substitute-command-keys
1909 before being passed to the function. Help strings, help-echo
1910 properties, etc. can therefore contain command key escapes and
1914 ** Time-related changes:
1916 *** Time conversion functions now accept an optional ZONE argument
1917 that specifies the time zone rules for conversion. ZONE is omitted or
1918 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1919 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1920 rule. The affected functions are ‘current-time-string’,
1921 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1922 function ‘encode-time’, which already accepted a simple time zone rule
1923 argument, has been extended to accept all the new forms.
1925 *** Time-related functions now consistently accept numbers
1926 (representing seconds since the epoch) and nil (representing the
1927 current time) as well as the usual list-of-integer representation.
1928 Affected functions include `current-time-string', `current-time-zone',
1929 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1930 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1931 `time-to-days', and `time-to-seconds'.
1933 *** The `encode-time-value' and `with-decoded-time-value' macros have
1936 *** `calendar-next-time-zone-transition', `time-add', and
1937 `time-subtract' no longer return time values in the obsolete and
1938 undocumented integer-pair format. Instead, they return a list of two
1942 ** New function `set-binary-mode' allows switching a standard stream
1943 of the Emacs process to binary I/O mode.
1946 ** The new function `directory-name-p' can be used to check whether a file
1947 name (as returned from, for instance, `file-name-all-completions') is
1948 a directory file name. It returns non-nil if the last character in
1949 the name is a directory separator character (forward slash on GNU and
1950 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1953 ** ASCII approximations to curved quotes are put in standard-display-table
1954 if the terminal cannot display curved quotes.
1957 ** Standard output and error streams now transliterate characters via
1958 standard-display-table, and encode output using locale-coding-system.
1959 To force a specific encoding, bind `coding-system-for-write' to the
1960 coding-system of your choice when invoking functions like `prin1' and
1964 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1967 ** New possible value for `system-type': `nacl'.
1968 This is used by Google's Native Client (NaCl).
1970 ** Miscellaneous name change
1973 For consistency with the usual Emacs spelling, the Lisp variable
1974 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1975 The old name should still work, as an obsolescent alias.
1977 ** Changes in Frame- and Window- Handling
1980 *** Emacs can now draw horizontal scroll bars on some platforms that
1981 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1982 Horizontal scroll bars are turned off by default.
1984 **** New function `horizontal-scroll-bars-available-p' telling whether
1985 horizontal scroll bars are available on the underlying system.
1987 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1988 bars on all existing and future frames.
1990 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1991 scroll bars on the selected frame.
1993 **** New frame parameters `horizontal-scroll-bars' and
1994 `scroll-bar-height' to set horizontal scroll bars and their height
1995 for individual frames and in `default-frame-alist'.
1997 **** New functions `frame-scroll-bar-height' and
1998 `window-scroll-bar-height' return the height of horizontal scroll
1999 bars on a specific frame or window.
2001 **** `set-window-scroll-bars' now accepts five parameters where the last
2002 two specify height and type of the window's horizontal scroll bar.
2004 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
2007 **** New buffer-local variables `horizontal-scroll-bar' and
2008 `scroll-bar-height'.
2011 *** New functions `frame-geometry' and `frame-edges' give access to a
2015 *** New functions `mouse-absolute-pixel-position' and
2016 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
2020 *** The function `window-edges' now accepts three additional arguments to
2021 retrieve body, absolute and pixel edges of the window.
2024 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
2025 `window-inside-absolute-pixel-edges' have been renamed to respectively
2026 `window-body-edges', `window-body-pixel-edges' and
2027 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
2030 *** New function `window-absolute-pixel-position' to get the screen
2031 coordinates of a visible buffer position.
2034 *** The height of a frame's menu and tool bar are no longer counted in the
2035 frame's text height. This means that the text height stands only for
2036 the height of the frame's root window plus that of the echo area (if
2037 present). This was already the behavior for frames with external tool
2038 and menu bars (like in the Gtk builds) but has now been extended to all
2042 *** Frames now do not necessarily preserve the number of columns or lines
2043 they display when setting default font, menu bar, fringe width, or
2044 scroll bars. In particular, maximized and fullscreen frames are
2045 conceptually never resized if such settings change. For fullheight and
2046 fullwidth frames, the behavior may depend on the toolkit used.
2047 **** New option `frame-inhibit-implied-resize' if non-nil, means that
2048 setting default font, menu bar, fringe width, or scroll bars of a
2049 specific frame does not resize that frame in order to preserve the
2050 number of columns or lines it displays.
2053 *** New function `window-preserve-size' allows you to preserve the size of
2054 a window without "fixing" it. It's supported by `fit-window-to-buffer',
2055 `temp-buffer-resize-mode' and `display-buffer'.
2058 *** New `display-buffer' action function `display-buffer-use-some-frame'.
2059 This displays the buffer in an existing frame other than the current
2060 frame, and allows the caller to specify a frame predicate to exclude
2064 *** New minor mode `window-divider-mode' and options
2065 `window-divider-default-places', `window-divider-default-bottom-width'
2066 and `window-divider-default-right-width'.
2069 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2070 Those features have been deprecated in Gtk+ for a long time.
2075 *** etags no longer qualifies class members by default.
2077 By default, `etags' will not qualify class members for C-like
2078 object-oriented languages with their class names and namespaces, and
2079 will remove qualifications used explicitly in the code from the tag
2080 names it puts in TAGS files. This is so the etags.el back-end for
2081 `xref-find-definitions' is more accurate and produces less false
2084 Use --class-qualify (-Q) if you want the old default behavior of
2085 qualifying class members in C++, Java, and Objective C. Note that
2086 using -Q might make some class members become "unknown" to `M-.'
2087 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
2088 qualified names by hand.
2091 *** New language Ruby
2093 Names of modules, classes, methods, functions, and constants are
2094 tagged. Overloaded operators are also tagged.
2098 Names of packages, functions, and types are tagged.
2101 *** Improved support for Lua
2103 Etags now tags functions even if the "function" keyword follows some
2104 whitespace at line beginning.
2107 * Changes in Emacs 25.1 on Non-Free Operating Systems
2110 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2111 This includes the makefile.w32-in files in various subdirectories, and
2112 the support files. The file nt/configure.bat now just tells the user
2113 to use the procedure described in nt/INSTALL, by running the Posix
2114 `configure' script in the top-level directory.
2117 ** Building Emacs for MS-Windows requires at least Windows XP
2118 or Windows Server 2003. The built binaries still run on all versions
2119 of Windows starting with Windows 9X.
2122 ** Emacs running on MS-Windows now supports the daemon mode.
2125 ** The byte counts in etags-generated TAGS files are now the same on
2126 MS-Windows as they are on other platforms.
2129 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2130 Pass '--without-ns' to configure to create an X11 build, the old default.
2133 ** OS X 10.5 or older is no longer supported.
2136 ** OS X on PowerPC is no longer supported.
2139 ** New variable `ns-use-fullscreen-animation' controls animation for
2140 non-native NS fullscreen. The default is nil. Set to t to enable
2141 animation when entering and leaving fullscreen. For native OSX fullscreen
2145 ** The new function 'w32-application-type' returns the type of an
2146 MS-Windows application given the name of its executable program file.
2148 ** New variable `w32-pipe-buffer-size'.
2149 It can be used to tune the size of the buffer of pipes created for
2150 communicating with subprocesses, when the program run by a subprocess
2151 exhibits unusual buffering behavior. Default is zero, which lets the
2152 OS use its default size.
2155 ----------------------------------------------------------------------
2156 This file is part of GNU Emacs.
2158 GNU Emacs is free software: you can redistribute it and/or modify
2159 it under the terms of the GNU General Public License as published by
2160 the Free Software Foundation, either version 3 of the License, or
2161 (at your option) any later version.
2163 GNU Emacs is distributed in the hope that it will be useful,
2164 but WITHOUT ANY WARRANTY; without even the implied warranty of
2165 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2166 GNU General Public License for more details.
2168 You should have received a copy of the GNU General Public License
2169 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2175 paragraph-separate: "[
\f]*$"