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 * Lisp Changes in Emacs 25.2
102 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
104 ** Autoload files can be generated without timestamps,
105 by setting `autoload-timestamps' to nil.
107 ** `ert-with-function-mocked' of 'ert-x package allows mocking of functions
111 * Changes in Emacs 25.2 on Non-Free Operating Systems
114 * Installation Changes in Emacs 25.1
117 ** Building Emacs now requires C99 or later.
120 ** Building Emacs now requires GNU make, version 3.81 or later.
123 ** New configure option --with-cairo.
124 This builds Emacs with Cairo drawing. As a side effect, it provides
125 support for built-in printing, when Emacs was built with GTK+.
126 Cairo drawing is an experimental feature in Emacs, and subject to
127 change in future releases.
130 ** New configure option --with-modules.
131 This enables support for loading dynamic modules; see below.
134 ** By default, Emacs no longer works on IRIX. We expect that Emacs
135 users are not affected by this, as SGI stopped supporting IRIX in
136 December 2013. If you are affected, please send a bug report. You
137 should be able to work around the problem either by porting the Emacs
138 undumping code to GCC under IRIX, or by configuring --with-wide-int,
139 or by sticking with Emacs 24.4.
142 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
143 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
144 since Emacs 24.4, and the other variants were undocumented and were
145 obstacles to maintenance and development. GC_MARK_STACK and its
146 related symbols have been removed from the C internals.
149 ** 'configure' now prefers gnustep-config when configuring GNUstep.
150 If gnustep-config is not available, the old heuristics are used.
153 ** 'configure' now prefers inotify to gfile for file notification,
154 unless gfile is explicitly requested via --with-file-notification='gfile'.
157 ** 'configure' detects the kqueue file notification library on *BSD
158 and Mac OS X machines.
161 ** The configure option '--with-pkg-config-prog' has been removed.
162 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
165 ** The configure option '--with-mmdf' has been removed.
166 It was no longer useful, as it relied on libraries that are no longer
167 supported, and its presence led to confusion during configuration.
168 This affects only the 'movemail' utility; Emacs itself can still
169 process MMDF-format files as before.
172 ** The configure option '--enable-silent-rules' is now the default,
173 and silent rules are now quieter. To get the old behavior where
174 'make' chatters a lot, configure with '--disable-silent-rules' or
175 build with 'make V=1'.
178 ** The configure option '--with-gameuser' now allows you to specify a
179 group instead of a user if its argument is prefixed by ':' (a colon).
180 This will cause the game score files in ${localstatedir}/games/emacs
181 to be owned by that group, and the helper program for updating them to
182 be installed setgid. The option now defaults to the 'games' group.
185 ** The `grep-changelog' script (and its manual page) are no longer included.
186 It has no particular connection to Emacs and has not changed in years,
187 so if you want to use it, you can always take a copy from an older Emacs.
190 ** Emacs 25 comes with a new set of icons.
191 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
192 The old Emacs logo icons are available as `emacs23.png' in the same location.
195 ** New make target `check-expensive' to run additional tests.
196 This includes all tests which run via "make check", plus additional
197 tests which take more time to perform.
200 * Startup Changes in Emacs 25.1
203 ** When Emacs is given a file as a command line argument and
204 `initial-buffer-choice' is non-nil, display both the file and
205 `initial-buffer-choice'. When Emacs is given more than one file and
206 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
207 and *Buffer List*. This makes Emacs convenient to use from the
208 command line when `initial-buffer-choice' is non-nil.
211 ** The value of ‘initial-scratch-message’ is now treated as a doc string
212 and can contain escape sequences for command keys, quotes, and the like.
215 * Changes in Emacs 25.1
218 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
219 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
220 xwidget support, you can access the embedded webkit browser with `M-x
221 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
222 browser. The buffer will have a new mode, `xwidget-webkit-mode'
223 (similar to `image-mode'), which supports the webkit widget.
226 *** New functions for xwidget-webkit mode `xwidget-webkit-insert-string',
227 `xwidget-webkit-adjust-size-dispatch', `xwidget-webkit-back',
228 `xwidget-webkit-browse-url', `xwidget-webkit-reload',
229 `xwidget-webkit-current-url', `xwidget-webkit-scroll-backward',
230 `xwidget-webkit-scroll-forward', `xwidget-webkit-scroll-down',
231 `xwidget-webkit-scroll-up'.
234 ** Emacs can now load shared/dynamic libraries (modules).
235 A dynamic Emacs module is a shared library that provides additional
236 functionality for use in Emacs Lisp programs, just like a package
237 written in Emacs Lisp would. The functions `load', `require',
238 `load-file', etc. were extended to load such modules, as they do with
239 Emacs Lisp packages. The new variable `module-file-suffix' holds the
240 system-dependent value of the file-name extension (`.so' on Posix
241 hosts) of the module files.
243 A module should export a C-callable function named
244 `emacs_module_init', which Emacs will call as part of the call to
245 `load' or `require' which loads the module. It should also export a
246 symbol named `plugin_is_GPL_compatible' to indicate that its code is
247 released under the GPL or compatible license; Emacs will refuse to
248 load modules that don't export such a symbol.
250 If a module needs to call Emacs functions, it should do so through the
251 API defined and documented in the header file `emacs-module.h'. Note
252 that any module that provides Lisp-callable functions will have to use
253 Emacs functions such as `fset' and `funcall', in order to register its
254 functions with the Emacs Lisp interpreter.
256 Modules can create `user-ptr' Lisp objects that embed pointers to C
257 struct's defined by the module. This is useful for keeping around
258 complex data structures created by a module, to be passed back to the
259 module's functions. User-ptr objects can also have associated
260 "finalizers" -- functions to be run when the object is GC'ed; this is
261 useful for freeing any resources allocated for the underlying data
262 structure, such as memory, open file descriptors, etc. A new
263 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
266 Loadable modules in Emacs are an experimental feature, and subject to
267 change in future releases. For that reason, their support is disabled
268 by default, and must be enabled by using the `--with-modules' option
272 ** A second dir-local file (.dir-locals-2.el) is now accepted.
273 See the variable `dir-locals-file-2' for more information.
276 ** Network security (TLS/SSL certificate validity and the like) is
277 added via the new Network Security Manager (NSM) and controlled via
278 the `network-security-level' variable.
281 ** International domain names (IDNA) are now encoded via the new
282 puny.el library, so that one can visit web sites like
283 "http://méxico.icom.museum".
286 ** C-h l now also lists the commands that were run.
288 ** The new M-s M-w key binding uses eww to search the web for the
292 ** The new `timer-list' command lists all active timers in a buffer
293 where you can cancel them with the `c' command.
295 ** M-x suggests shorthands and ignores obsolete commands for completion.
296 ** x-select-enable-clipboard is renamed select-enable-clipboard.
297 x-select-enable-primary and renamed select-enable-primary.
298 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
299 name it), with the proviso that on some systems (e.g. Windows)
300 select-enable-primary is ineffective since the system doesn't
301 have the equivalent of a primary selection.
304 ** New option `switch-to-buffer-in-dedicated-window' allows you to
305 customize how `switch-to-buffer' proceeds interactively when the
306 selected window is strongly dedicated to its buffer.
309 ** The option `even-window-heights' has been renamed to
310 `even-window-sizes' and now handles window widths as well.
313 ** New function `read-multiple-choice' use to prompt for
314 multiple-choice questions, with a handy way to display help texts.
317 ** terpri gets an optional arg ENSURE to conditionally output a newline.
320 ** `insert-register' now leaves point after the inserted text
321 when called interactively. A prefix argument toggles this behavior.
324 ** The new variable `term-file-aliases' replaces some files from lisp/term.
325 The function `tty-run-terminal-initialization' consults this variable
326 when deciding what terminal-specific initialization code to run.
329 ** New variable `system-configuration-features', listing some of the
330 main features that Emacs was compiled with. This is mainly intended
331 for use in Emacs bug reports.
334 ** A password is now hidden also when typed in batch mode. Another
335 hiding character but the default `.' can be used by let-binding the
336 variable `read-hide-char'.
339 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
342 * Editing Changes in Emacs 25.1
345 ** M-x suggests shorthands and ignores obsolete commands for completion.
350 *** Successive single-char deletions are collapsed in the undo-log just like
351 successive char insertions. Which commands invoke this behavior is
352 controlled by the new `undo-auto-amalgamate' function. See the node
353 "Undo" in the ELisp manual for more details.
356 *** The heuristic used to insert `undo-boundary' after each command
357 has changed, so that if a command causes changes in more than just the
358 current buffer, Emacs now calls `undo-boundary' in every buffer
359 affected by the command.
362 ** New command `comment-line' bound to `C-x C-;'.
364 ** New and improved facilities for inserting Unicode characters
367 *** Unicode names entered via C-x 8 RET now use substring completion by default.
370 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
371 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
374 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
375 as you type. See also the new variable ‘text-quoting-style’.
378 ** New minor mode global-eldoc-mode is enabled by default.
381 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
382 Bracketed paste mode causes text terminals to wrap pasted text in special
383 escape sequences that allow Emacs to tell the difference between text
384 you type and text you paste from other applications. Emacs then
385 avoids interpreting each character in the pasted text as it does with
386 keyboard input, which results in a paste experience similar to that
387 under a window system, and significant performance improvements when
388 pasting large amounts of text.
390 Bracketed paste mode is disabled by default, so Emacs automatically
391 enables it at startup if the terminal supports it.
394 ** Emacs now supports the latest version of the UBA.
395 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
396 was updated to support all the latest additions and changes introduced
397 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
398 This includes full support for directional isolates and the
399 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
403 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
406 ** New buffer-local `electric-pair-local-mode'.
409 ** New variable `fast-but-imprecise-scrolling' inhibits
410 fontification during full screen scrolling operations, giving less
411 hesitant operation during auto-repeat of C-v, M-v at the cost of
412 possible inaccuracies in the end position.
415 ** New documentation command `describe-symbol'.
416 Works for functions, variables, faces, etc. It is bound to `C-h o' by
420 ** New function `custom-prompt-customize-unsaved-options' checks for
421 unsaved customizations and prompts user to customize (if found). It
422 is intended for adding to 'kill-emacs-query-functions'.
425 ** The old `C-x w' bindings in hi-lock-mode are officially deprecated
426 in favor of the global `M-s h' bindings introduced in Emacs-23.1.
427 They'll disappear soon.
430 * Changes in Specialized Modes and Packages in Emacs 25.1
435 *** New command `checkdoc-package-keywords' checks if the
436 current package keywords are recognized. Set the new option
437 `checkdoc-package-keywords-flag' to non-nil to make
438 `checkdoc-current-buffer' call this function automatically.
441 *** New function `checkdoc-file' checks for style errors.
442 It's meant for use together with `compile':
443 emacs -batch --eval "(checkdoc-file \"subr.el\")"
448 *** The desktop format version has been upgraded from 206 to 208.
449 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
450 cannot read a version 208 desktop. To upgrade your desktop file, you
451 must explicitly request the upgrade, by C-u M-x desktop-save. You are
452 recommended to do this as soon as you have firmly upgraded to Emacs
453 25.1 (or later). Should you ever need to downgrade your desktop file
454 to version 206, you can do this with C-u C-u M-x desktop-save.
457 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
458 It raises an error if a bookmark of that name already exists,
459 unlike `bookmark-set' which silently updates an existing bookmark.
464 *** New user options `mm-html-inhibit-images' and `mm-html-blocked-images'
465 now control how mm-* functions fetch and display images in an HTML
466 message. Gnus still uses `gnus-inhibit-images' and `gnus-blocked-images'
467 for that purpose, i.e., binds mm-html- variables with those gnus-
468 variables, but other packages do not have to bind gnus- variables now.
471 *** `mm-inline-text-html-with-images' has been removed.
472 Use `mm-html-inhibit-images' instead. Note that the value is opposite
478 *** `imap-ssl-program' has been removed, and imap.el uses the internal
479 GnuTLS encryption functions if possible.
484 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
485 the ordering of object keys by default.
488 *** New commands `json-pretty-print-ordered' and
489 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
490 object keys sorted alphabetically.
493 ** Prog mode has some support for multi-mode indentation.
494 This allows better indentation support in modes that support multiple
495 programming languages in the same buffer, like literate programming
496 environments or ANTLR programs with embedded Python code.
498 A major mode can provide indentation context for a sub-mode through
499 the `prog-indentation-context' variable. To support this, modes that
500 provide indentation should use `prog-widen' instead of `widen' and
501 `prog-first-column' instead of a literal zero. See the node
502 "Mode-Specific Indent" in the ELisp manual for more details.
504 ** Prettify Symbols mode
507 *** Prettify Symbols mode supports custom composition predicates. By
508 overriding the default `prettify-symbols-compose-predicate', modes can
509 specify in which contexts a symbol may be displayed as some Unicode
510 character. `prettify-symbols-default-compose-p' is the default which
511 is suitable for most programming languages such as C or Lisp (but not
515 *** Symbols can be unprettified while point is inside them.
516 New variable `prettify-symbols-unprettify-at-point' configures this.
518 ** Enhanced xterm support
521 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
522 This variable tells Emacs which advanced capabilities are available in
523 the xterm terminal emulator used to display Emacs text-mode frames.
524 The default is to check each capability, and use it if available.
525 (This variable was introduced in Emacs 24.1, but was not announced in
529 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
530 in the surrounding GUI (using the OSC-52 escape sequence). This only works
531 if your xterm supports it and enables the `allowWindowOps' options (disabled
532 by default at least in Debian, for security reasons).
534 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
535 escape sequence) if your xterm has the feature enabled but for that you
536 additionally need to add `getSelection' to `xterm-extra-capabilities'.
539 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
542 ** The `save-place' variable is replaced by `save-place-mode'.
547 *** ERC can now hide message types by network or channel.
548 `erc-hide-list' will hide all messages of the specified type, while
549 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
550 specified message types for the respective specified targets.
552 *** New variable `erc-default-port-tls' used to connect to TLS IRC
556 *** Reconnection is now asynchronous.
559 *** Nick completion is now case-insensitive again after inadvertently
560 being made case-sensitive in Emacs 24.2.
565 *** New commands, key binds, and menu items.
567 **** `<' and `>' for navigating previous and next tracks in playlist
569 **** New play/pause command `mpc-toggle-play' bound to `s'
571 **** `g' bound to new command `mpc-seek-current' will navigate current
574 **** New commands `mpc-toggle-{consume,repeat,single,shuffle}' for
575 toggling playback modes.
578 *** Now supports connecting to a UNIX domain socket.
581 *** Looks at more image file names to use as album art.
582 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
583 (XP) in addition to cover.jpg.
586 *** Searches in more locations for MPD configuration files.
587 MPD supports the XDG base directory specification since version 0.17.6.
592 *** `midnight-mode' is now a proper minor mode.
595 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
600 *** New "external" package status.
601 An external package is any installed package that's not built-in and
602 not from `package-user-dir', which usually means it's from an entry in
603 `package-directory-list'. They are treated much like built-in
604 packages, in that they cannot be deleted through the package menu and
605 are not considered for upgrades.
607 The effect is that a user can manually place a specific version of a
608 package inside `package-directory-list' and the package menu will
612 *** If a package is available on multiple archives and one has higher
613 priority (as per `package-archive-priorities') only that one is
614 listed. This can be configured with `package-menu-hide-low-priority'.
617 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
618 This includes the above-mentioned low-priority packages, as well as
619 available packages whose version is lower than the currently installed
620 version (which were previously impossible to display).
621 This allows users to downgrade a package if a lower version is
625 *** When filtering the package menu, keywords starting with "arc:" or
626 "status:" represent package archive or status, respectively, instead
630 *** Most functions which involve downloading information now take an
631 ASYNC argument. If it is non-nil, package.el performs the download(s)
635 *** New variable `package-menu-async' controls whether the
636 package-menu uses asynchronous downloads.
639 *** `package-install-from-buffer' and `package-install-file' work on directories.
640 This follows the same rules as installing from a .tar file, except the
641 -pkg file is optional.
644 *** Packages which are dependencies of other packages cannot be deleted.
645 The FORCE argument to `package-delete' overrides this.
648 *** New custom variable `package-selected-packages' tracks packages
649 which were installed by the user (as opposed to installed as
650 dependencies). This variable can also be manually customized.
653 *** New command `package-install-selected-packages' installs all
654 packages from `package-selected-packages' which are currently missing.
657 *** New command `package-autoremove' removes all packages which were
658 installed strictly as dependencies but are no longer needed.
663 When you invoke `shell' interactively, the *shell* buffer will now
664 display in a new window. However, you can customize this behavior via
665 the `display-buffer-alist' variable. For example, to get
666 the old behavior -- *shell* buffer displays in current window -- use
667 (add-to-list 'display-buffer-alist
668 '("^\\*shell\\*$" . (display-buffer-same-window))).
672 *** The `:protection' slot option is not obeyed any more.
674 *** The `newname' argument to constructors is optional&deprecated.
675 If you need your objects to be named, do it by inheriting from `eieio-named'.
677 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
679 *** The <class> variables are declared obsolete.
681 *** The <initarg> variables are declared obsolete.
683 *** defgeneric and defmethod are declared obsolete.
684 Use the equivalent facilities from cl-generic.el instead.
686 *** `constructor' is now an obsolete alias for `make-instance'.
687 --- `pcase' accepts a new UPattern `eieio'.
692 *** New command `ido-bury-buffer-at-head' bound to C-S-b
693 Bury the buffer at the head of `ido-matches', analogous to how C-k
694 kills the buffer at head.
697 *** A prefix argument to `ido-restrict-to-matches' will reverse its
698 meaning, and the list is restricted to those elements that do not
699 match the current input.
704 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
705 The new commands `next-line-or-history-element' and
706 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
707 minibuffer, allow by-line movement through minibuffer history,
708 similarly to an ordinary buffer. Only when point moves over
709 the bottom/top of the minibuffer it goes to the next/previous history
710 element. `M-p' and `M-n' still move directly to previous/next history
713 ** Search and Replace
716 *** `isearch' and `query-replace' can now perform character folding in matches.
717 Isearch does that by default, while `query-replace' will do that if
718 the new variable `replace-character-fold' is customized to a non-nil
719 value. This is analogous to case folding, but instead of disregarding
720 case variants, it disregards wider classes of distinctions between
721 similar characters. (Case folding is a special case of character
722 folding.) This means many characters in the search string will match
723 entire groups of characters instead of just themselves.
725 For instance, the " will match all variants of double quotes (like “
726 and ”), and the letter a will match all of its accented cousins, even
727 those composed of multiple characters, as well as many other symbols
730 Character folding is enabled by customizing `search-default-mode' to
731 the value `character-fold-to-regexp'. If you want to turn character
732 folding off, customize the value of `search-default-mode' to the `nil'
733 value. You can also toggle character folding in the middle of a
734 search by typing `M-s ''.
737 *** New user option `search-default-mode'.
738 This option specifies the default mode for Isearch. The default
739 value, `character-fold-to-regexp' specifies that Isearch should fold
740 characters when searching.
743 *** New function `character-fold-to-regexp' can be used
744 by searching commands to produce a regexp matching anything that
745 character-folds into STRING.
748 *** The new M-s M-w key binding uses eww to search the web for the
749 text in the region. The search engine to use for this is specified by
750 the customizable variable `eww-search-prefix'.
753 *** Query-replace history is enhanced.
754 When query-replace reads the FROM string from the minibuffer, typing
755 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
756 and TO are the original text and its replacement, and SEP is an arrow
757 string defined by the new variable `query-replace-from-to-separator'.
758 To select a prior replacement, type `M-p' until the desired
759 replacement appears in the minibuffer, and then exit the minibuffer by
764 *** If `quick-calc' is called with a prefix argument, insert the
765 result of the calculation into the current buffer.
768 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
769 this you can tell Edebug not to stop at the start of the first
770 instrumented function.
775 *** New minor mode `global-eldoc-mode'
776 It is turned on by default, and affects `*scratch*' and other buffers
777 whose major mode supports Emacs Lisp.
780 *** `eldoc-documentation-function' now defaults to `ignore'
783 *** `describe-char-eldoc' displays information about character at point,
784 and can be used as a default value of `eldoc-documentation-function'. It is
785 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
786 ] [, ] [, etc.) while using mono-spaced font.
791 *** HTML can now be rendered using variable-width fonts.
794 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
795 whether to use variable-pitch fonts or not. The user can also
796 customize the `shr-use-fonts' variable.
799 *** A new command `C' (`eww-toggle-colors') can be used to toggle
800 whether to use the HTML-specified colors or not. The user can also
801 customize the `shr-use-colors' variable.
804 *** A new command `R' (`eww-readable') will try do identify the main
805 textual parts of a web page and display only that, leaving menus and
806 the like off the page.
809 *** Images that are being loaded are now marked with grey
810 "placeholder" images of the size specified by the HTML. They are then
811 replaced by the real images asynchronously, which will also now
812 respect width/height HTML specs (unless they specify widths/heights
813 bigger than the current window).
816 *** You can now use several eww buffers in parallel by renaming eww
817 buffers you want to keep separate.
820 *** Partial state of the eww buffers (the URIs and the titles of the
821 pages visited) is now preserved in the desktop file.
824 *** `eww-after-render-hook' is now called after eww has rendered
825 the data in the buffer.
828 *** The `eww-reload' command now takes a prefix to not reload via
829 the net, but just use the local copy of the HTML.
832 *** The DOM shr and eww uses has been changed to the general Emacs
833 xml.el/libxml2 DOM, and a new package dom.el has been added to
834 interact with this DOM. See the Emacs Lisp manual for interface
838 *** `mailcap-mime-data' is now consulted when displaying PDF files.
841 *** The new `S' command will list all eww buffers, and allow managing
845 *** https pages with valid certificates have headers marked in green, while
846 invalid certificates are marked in red.
851 *** text/html messages that contain inline image parts will be
852 transformed into multipart/related messages before sending.
855 *** The `message-valid-fqdn-regexp' variable has been removed, since
856 there are now top-level domains added all the time. Message will no
857 longer warn about sending emails to top-level domains it hasn't heard
860 *** `message-beginning-of-line' (bound to C-a) understands folded headers.
861 In `visual-line-mode' it will look for the true beginning of a header
862 while in non-`visual-line-mode' it will move the point to the indented
866 ** In Show Paren Mode, a parenthesis can be highlighted when point
867 stands inside it, and certain parens can be highlighted when point is
868 at BOL or EOL, or in whitespace there. To enable these, customize,
869 respectively, `show-paren-when-point-inside-paren' or
870 `show-paren-when-point-in-periphery'.
873 ** If gpg2 exists on the system, it is now used as the default value
874 of `epg-gpg-program' (instead of gpg).
879 *** Images are automatically scaled before displaying based on the
880 `image-scaling-factor' variable (if Emacs supports scaling the images
884 *** Images inserted with `insert-image' and related functions get a
885 keymap put into the text properties (or overlays) that span the
886 image. This keymap binds keystrokes for manipulating size and
887 rotation, as well as saving the image to a file.
890 *** A new library for creating and manipulating SVG images has been
891 added. See the "SVG Images" section in the lispref manual for
895 *** New setf-able function to access and set image parameters is
896 provided: `image-property'.
902 *** Strings after `:documentation' are highlighted as docstrings.
903 This enhances Lisp mode fontification to handle documentation of the
904 form `(:documentation "the doc string")' used in Common Lisp code for
905 CLOS class and slot documentation.
910 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
913 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
914 *** `string-rectangle' provides on-the-fly preview of the result.
917 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
918 These should be used in preference to `font-lock-fontify-buffer' when
922 ** Macro `minibuffer-with-setup-hook' can optionally append a function
923 to `minibuffer-setup-hook'.
925 If the first argument of the macro is of the form `(:append FUN)',
926 then FUN will be appended to `minibuffer-setup-hook', instead of
931 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
934 *** `pcase' accepts the new UPattern `cl-struct'.
936 ** Calendar and diary
939 *** The default `diary-file' is now located in .emacs.d.
942 *** New commands to insert diary entries with Chinese dates:
943 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
944 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
947 *** The calendar can now list and mark diary entries with Chinese dates.
948 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
951 *** The option `calendar-mode-line-format' can now be nil,
952 which means to do nothing special with the mode line in calendars.
955 *** New option `calendar-weekend-days'.
956 The option customizes which day headers receive the
957 `calendar-weekend-header' face.
960 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
963 *** Many items obsolete since at least version 23.1 have been removed.
964 The majority were function/variable/face aliases, too numerous to list here.
967 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
968 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
970 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
972 **** Macro `calendar-for-loop'.
974 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
976 **** The nil and list forms of `diary-display-function'.
979 ** New ERT function `ert-summarize-tests-batch-and-exit'.
980 If the output of ERT tests in batch mode execution can be saved to a
981 log file, then it can be passed as an argument to the above function
982 to produce a neat summary.
985 ** New js.el option `js-indent-first-init'.
986 It was renamed from `js-indent-first-initialiser', to avoid issues
987 with American vs British spelling.
992 ** Info mode now displays symbol names in fixed-pitch font.
993 If you want to get the old behavior back, customize the `Info-quoted'
994 face to use the same definitions as the default face.
997 *** `Info-fontify-maximum-menu-size' can be t for no limit.
1000 *** `info-display-manual' can now be given a prefix argument which (any
1001 non-nil value) directs the command to limit the completion
1002 alternatives to currently visited manuals.
1005 ** ntlm.el has support for NTLM2.
1010 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
1011 to delete or undelete multiple messages.
1014 *** Rmail can now render HTML mail messages if your Emacs was built with
1015 libxml2 or if you have the Lynx browser installed. By default, Rmail
1016 will display the HTML version of a mail message that has both HTML and
1017 plain text parts, if display of HTML email is possible; customize the
1018 `rmail-mime-prefer-html' option to `nil' if you don't want that.
1021 *** In the commands that make summaries by subject, recipients, or senders,
1022 you can no longer use commas to separate regular expressions.
1025 ** SES now supports local printer functions; see `ses-define-local-printer'.
1027 ** Shell-script Mode
1029 *** In sh-mode you can now use `sh-shell' as a file-local variable to
1030 specify the type of shell in use (bash, csh, etc).
1033 *** New value `always' for `sh-indent-after-continuation'.
1034 This provides old-style ("dumb") indentation of continued lines.
1035 See the doc string of `sh-indent-after-continuation' for details.
1039 *** Fatal TLS errors are now silent by default.
1042 *** If Emacs isn't built with TLS support, an external TLS-capable
1043 program is used instead. This program used to be run in --insecure
1044 mode by default, but has now changed to be secure instead, and will
1045 fail if you try to connect to non-verifiable hosts. This is
1046 controlled by the `tls-program' variable.
1051 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1052 When `url-handler-mode' is enabled, file operations for these
1053 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1056 *** The URL package allows customizing the `url-user-agent' string.
1057 The new `url-user-agent' variable can be customized to be a string or
1061 *** The new interface variable `url-request-noninteractive' can be used
1062 to specify that we're running in a noninteractive context, and that
1063 we should not be queried about things like TLS certificate validity.
1066 *** If URL is used with a https connection, the first callback argument
1067 plist will contain a :peer element that has the output of
1068 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
1071 *** The new function `url-cookie-delete-cookie' can be used to
1072 programmatically delete all cookies, or cookies from a specific
1078 *** New connection method "afp", which allows you to access Mac OS X
1079 volumes via the Apple Filing Protocol.
1082 *** New connection method "nc", which allows you to access dumb
1086 *** Method-specific parameters can be overwritten now with variable
1087 `tramp-connection-properties'.
1090 *** Handler for `file-notify-valid-p' for remote machines that support
1091 filesystem notifications.
1096 *** New user variable `sql-default-directory' enables remote
1097 connections using Tramp.
1100 *** New command `sql-send-line-and-next'.
1101 This command, bound to `C-c C-n' by default, sends the current line to
1102 the SQL process and advances to the next line, skipping whitespace and
1106 *** Added support for Vertica SQL.
1108 ** VC and related modes
1111 *** Basic push support, via `vc-push', bound to `C-x v P'.
1112 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1113 (undocumented) command vc-hg-push now behaves slightly differently.
1116 *** The new command vc-region-history shows the log+diff of the active region.
1119 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
1120 This command is useful when you perform version control commands
1121 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1122 back-end for the buffer's file, or remove it from version control.
1125 *** New option `vc-annotate-background-mode' controls whether
1126 the color range from `vc-annotate-color-map' is applied to the
1127 background or to the foreground.
1130 *** `compare-windows' now compares text with the most recently selected window
1131 instead of the next window. If you want the previous behavior of
1132 comparing with the next window, customize the new option
1133 `compare-windows-get-window-function' to the value
1134 `compare-windows-get-next-window'.
1137 *** Two new faces `compare-windows-removed' and `compare-windows-added'
1138 replace the face `compare-windows', which is now an obsolete alias for
1139 `compare-windows-added'.
1142 *** The VC state indicator in the mode line now has different faces
1143 corresponding to each of the possible states. See the `vc-faces'
1144 customization group.
1147 *** `log-edit-insert-changelog' converts "(tiny change)" to
1148 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
1149 nil to disable this.
1152 ** VHDL mode now supports VHDL'08.
1157 *** Decimal display mode uses "," groups, so it's more
1158 fitting for use in money calculations
1161 *** Factorial works with non-integer inputs.
1166 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1167 macro argument expansion, interactive macro evaluation and automatic
1168 scanning of #define'd symbols.
1171 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
1172 result of evaluating a macro.
1175 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
1176 all defined symbols in `hide-ifdef-env'.
1179 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
1180 file name patterns. Defaults to files whose extension is one of `.h',
1181 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
1184 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
1185 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1186 (This could happen when an idempotent header file is visited again,
1187 when its guard symbol is already defined.) Defaults to `t'.
1190 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
1191 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1192 looking for macro definitions. By default, no symbols are ignored.
1197 *** New custom variable `tex-print-file-extension' to help users who
1198 use PDF instead of DVI.
1201 *** TeX mode now supports Prettify Symbols mode. When enabling
1202 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1203 many other math macros are displayed using unicode characters.
1206 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
1207 By default, 32 consecutive spaces or four consecutive TABs are
1208 considered to be too deep, but the new variable
1209 `whitespace-big-indent-regexp' can be customized to change that.
1212 ** New options in `tildify-mode'.
1213 New options `tildify-space-string', `tildify-pattern', and
1214 `tildify-foreach-region-function' variables make
1215 `tildify-string-alist', `tildify-pattern-alist', and
1216 `tildify-ignored-environments-alist' variables (as well as a few
1217 helper functions) obsolete.
1220 ** New package Xref replaces Etags's front-end and UI
1222 The new package Xref provides a generic framework and new commands to
1223 find and move to definitions of functions, macros, data structures
1224 etc., as well as go back to the location where you were before moving
1225 to a definition. It supersedes and obsoletes many Etags commands,
1226 while still using the etags.el code that reads the TAGS tables as one
1229 The command `xref-find-definitions' replaces `find-tag' and provides
1230 an interface to pick one definition among several.
1231 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
1232 `pop-tag-mark', but has a keybinding (`M-,') different from the one
1233 `pop-tag-mark' used.
1235 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
1236 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1237 `xref-find-apropos' replaces `find-tag-regexp'.
1239 As a result of this, the following commands are now obsolete:
1240 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1243 `tags-loop-continue' is not obsolete because it's still useful in
1244 `tags-search' and `tags-query-replace', for which there are no direct
1248 *** Variants of `tags-search' and `tags-query-replace' in Dired were also
1249 replaced by xref-style commands, see the "Dired" section below.
1254 `find-tag-marker-ring-length' is now an obsolete alias for
1255 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1256 alias for a private variable. `xref-push-marker-stack' and
1257 `xref-pop-marker-stack' should be used instead to manipulate the stack
1258 of searches for definitions.
1261 *** `xref-find-definitions' and `describe-function' now display
1262 information about mode local overrides (defined by cedet/mode-local.el
1263 `define-overloadable-function' `define-mode-local-overrides').
1265 The framework's Lisp API is still experimental and can change in major,
1266 backward-incompatible ways.
1269 ** New package Project
1271 The new package Project provides generic infrastructure for dealing
1272 with projects. The main commands included in it are
1273 `project-find-file' and `project-find-regexp'.
1275 The Lisp API of this package is still experimental.
1278 EUDC's LDAP backend has been improved.
1281 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1284 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1285 subprocess instead of on the command line.
1288 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1289 need to configure this manually anymore.
1292 *** The LDAP configuration section of EUDC's manual has been
1295 There have also been customization changes.
1298 *** New custom variable `eudc-server-hotlist' to allow specifying
1299 multiple EUDC servers in init file.
1302 *** Custom variable `eudc-inline-query-format' defaults to completing
1303 on email and firstname instead of surname.
1306 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1307 to avoid interfering with the kill ring.
1310 *** Custom variable `eudc-inline-expansion-format' defaults to
1311 "Firstname Surname <mail-address>".
1314 *** Custom variable `eudc-options-file' defaults to
1315 "~/.emacs.d/eudc-options".
1318 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1319 allow overriding the regular expression that recognizes the ldapsearch
1320 command line's password prompt.
1323 EUDC's BBDB backend now supports BBDB 3.
1326 EUDC's PH backend (eudcb-ph.el) is obsolete.
1331 *** The new built-in command `clear' can scroll window contents out of sight.
1332 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1335 *** New buffer syntax '#<buffer-name>', which is equivalent to
1336 '#<buffer buffer-name>'. This shorthand makes interacting with
1337 buffers from eshell more convenient. Custom variable
1338 `eshell-buffer-shorthand', which has been broken for a while, has been
1342 *** By default, eshell "visual" program buffers (created by
1343 `eshell-visual-commands' and similar custom vars) are no longer killed
1344 when their processes die. This fixes issues with short-lived commands
1345 and makes visual programs more useful in general. For example, if
1346 "git log" is a visual command, it will always show the visual command
1347 buffer, even if the "git log" process dies. For the old behavior,
1348 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1353 *** Support for the Google Chrome web browser.
1356 *** Support for the Conkeror web browser.
1359 *** Support for several ancient browsers is now officially obsolete.
1362 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1363 be added to the archive.
1366 ** Autorevert: dired buffers are also auto-reverted via file
1367 notifications, if Emacs is compiled with file notification support.
1369 ** File Notifications
1372 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1375 *** The new event `stopped' signals, that a file notification watch is
1376 not active any longer.
1379 *** The new function `file-notify-valid-p' checks, whether a file
1380 notification descriptor still corresponds to an activate watch.
1385 *** The command `dired-do-compress' bound to `Z' now can compress
1386 directories and decompress zip files.
1389 *** New command `dired-do-compress-to' bound to `c' can be used to
1390 compress many marked files into a single named archive. The
1391 compression command is determined from the new
1392 `dired-compress-files-alist' variable.
1395 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1396 viewing HTML files and the like.
1398 *** New user interface for the `A' and `Q' commands.
1399 These keys, now bound to `dired-do-find-regexp' and
1400 `dired-do-find-regexp-and-replace', work similarly to `xref-find-apropos'
1401 and `xref-query-replace-in-results': they present the matches
1402 in the `*xref*' buffer and let you move through the matches. No need
1403 to use `tags-loop-continue' to resume the search or replace loop. The
1404 previous commands, `dired-do-search' and
1405 `dired-do-query-replace-regexp', are still available, but not bound to
1406 keys; rebind `A' and `Q' to invoke them if you want the old behavior
1407 back. We intend to obsolete the old commands in a future release.
1409 ** Tabulated List Mode
1412 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1413 call `tabulated-list-init-header', in which case it will have no
1417 *** `tabulated-list-print' takes a second optional argument, update,
1418 which specifies an alternative printing method which is faster when
1419 few or no entries have changed.
1421 ** Obsolete packages
1427 *** landmark.el (moved to elpa.gnu.org)
1430 * New Modes and Packages in Emacs 25.1
1433 ** pinentry.el allows GnuPG passphrase to be prompted through the
1434 minibuffer instead of a graphical dialog, depending on whether the gpg
1435 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1436 is set). This feature requires newer versions of GnuPG (2.1.5 or
1437 later) and Pinentry (0.9.5 or later). To use this feature, add
1438 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1439 configuration with "gpgconf --reload gpg-agent".
1442 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1443 The main entry points are `cl-defgeneric' and `cl-defmethod'. See the
1444 node "Generic Functions" in the Emacs Lisp manual for more details.
1447 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1448 SCSS (Sassy CSS) files.
1451 ** let-alist is a new macro (and a package) that allows one to easily
1452 let-bind the values stored in an alist.
1455 ** `tildify-mode' allows automatic insertion of hard spaces as one
1456 types the text. Breaking line after a single-character words is
1457 forbidden by Czech and Polish typography (and may be discouraged in
1458 other languages), so `auto-tildify-mode' makes it easier to create
1459 a typographically-correct documents.
1462 ** The `seq' library adds sequence manipulation functions and macros
1463 that complement basic functions provided by subr.el. All functions
1464 are prefixed with `seq-' and work on lists, strings and vectors.
1465 `pcase' accepts a new Upattern `seq'.
1468 ** The `map' library provides map-manipulation functions that work on
1469 alists, hash-table and arrays. All functions are prefixed with
1470 `map-'. `pcase' accepts a new UPattern `map'.
1473 ** The `thunk' library provides functions and macros to control the
1474 evaluation of forms.
1477 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1478 support for JSX, an XML-like syntax extension to ECMAScript.
1481 * Incompatible Lisp Changes in Emacs 25.1
1484 ** `setq' and `setf' must now be called with an even number of
1485 arguments. The earlier behavior of silently supplying a nil to the
1486 last variable when there was an odd number of arguments has been
1490 ** `syntax-begin-function' is declared obsolete.
1491 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1492 slot in font-lock-defaults.
1495 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1496 called during startup. Users who call this function in their init
1497 file and still expect it to be run after startup should set
1498 `package-enable-at-startup' to t after the call to
1499 `package-initialize'.
1502 ** `:global' minor mode use `setq-default' rather than `setq'.
1503 This means that you can't use `make-local-variable' and expect them to
1504 "magically" become buffer-local.
1507 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1508 The `track-mouse' form no longer refrains from changing the shape of
1509 the mouse pointer for the entire time the body of that form is
1510 executed. Lisp programs that use `track-mouse' for dragging across
1511 large portions of the Emacs display, and want to avoid changes in the
1512 pointer shape during dragging, should bind the variable `track-mouse'
1513 to the special value `dragging' in the body of the form.
1516 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1517 has any effect. (This change was made in Emacs 24.4 but was not
1518 advertised at the time.)
1521 ** `indirect-function' does not signal `void-function' any more.
1522 This is mostly a bug-fix, since this change was missed back in 24.4 when
1523 symbol-function was changed not to signal `void-function' any more.
1526 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1529 ** Comint, term, and compile do not set the EMACS env var any more.
1530 Use the INSIDE_EMACS environment variable instead.
1533 ** `save-excursion' does not save&restore the mark any more.
1534 Use `save-mark-and-excursion' if you want the old behavior.
1537 ** `read-buffer' and `read-buffer-function' can now be called with a 4th
1538 argument (`predicate').
1541 ** `completion-table-dynamic' by default stays in the minibuffer.
1542 The minibuffer will be the current buffer when the function is called.
1543 If you want the old behavior of calling the function in the buffer
1544 from which the minibuffer was entered, use the new argument
1545 `switch-buffer' to `completion-table-dynamic'.
1548 ** window-configurations no longer record the buffers' marks.
1551 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1552 active region handling.
1555 ** deactivate-mark is now buffer-local.
1558 ** `cl-the' now asserts that its argument is of the given type.
1561 ** `process-running-child-p' may now return a numeric process
1562 group ID instead of `t'.
1565 ** Mouse click events on mode line or header line no longer include
1566 any reference to a buffer position. The 6th member of the mouse
1567 position list returned for such events is now nil.
1570 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1571 These slots used to hold key-shortcut data, but have been obsolete since
1575 ** Emacs no longer downcases the first letter of a system diagnostic
1576 when signaling a file error. For example, it now reports "Permission
1577 denied" instead of "permission denied". The old behavior was problematic
1578 in languages like German where downcasing rules depend on grammar.
1581 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1582 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1583 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1584 and apostrophe `like this'. The default value nil acts like ‘curve’
1585 if curved single quotes are displayable, and like ‘grave’ otherwise.
1586 The new variable affects display of diagnostics and help, but not of info.
1589 ** substitute-command-keys now replaces quotes.
1590 That is, it converts documentation strings’ quoting style as per the
1591 value of ‘text-quoting-style’. Doc strings in source code can use
1592 either curved single quotes or grave accents and apostrophes. As
1593 before, characters preceded by \= are output as-is.
1596 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1597 They use the new ‘format-message’ function instead of plain ‘format’,
1598 so that they now follow user preference as per ‘text-quoting-style’
1599 when processing curved single quotes, grave accents, and apostrophes
1600 in their format argument.
1603 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1604 now match multibyte characters using Unicode character properties.
1605 If you want the old behavior where they matched any character with
1606 word syntax, use `\sw' instead.
1609 ** The character classes [:graph:] and [:print:] in regular expressions
1610 no longer match every multibyte character. Instead, Emacs now
1611 consults the Unicode character properties to determine which
1612 characters are graphic or printable. In particular, surrogates and
1613 unassigned codepoints are now rejected. If you want the old behavior,
1614 use [:multibyte:] instead.
1617 ** The `diff' command uses the unified format now. To restore the old
1618 behavior, set `diff-switches' to `-c'.
1621 ** `grep-template' and `grep-find-template' values don't include the
1622 --color argument anymore. It's added at the <C> place holder position
1623 dynamically. Any third-party code that changes these templates should
1624 be updated accordingly.
1627 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1628 The new behavior is compatible with Common Lisp and with XEmacs.
1629 This change does not affect Lisp code intended to be portable to
1630 Emacs 24.2 and earlier, which did not support unary ‘/’.
1633 ** The `default-directory' value doesn't have to end slash. To make
1634 that happen, `unhandled-file-name-directory' now defaults to calling
1635 `file-name-as-directory'.
1638 * Lisp Changes in Emacs 25.1
1642 *** New UPatterns `quote', `app'.
1644 *** New UPatterns can be defined with `pcase-defmacro'.
1646 *** New vector QPattern.
1649 ** syntax-propertize is now automatically called on-demand during forward
1650 parsing functions like `forward-sexp'.
1653 ** New hooks `prefix-command-echo-keystrokes-functions' and
1654 `prefix-command-preserve-state-hook' allow the definition of prefix
1655 commands other than the predefined `C-u'.
1658 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1659 These allow conversion between buffer positions and the corresponding
1660 file byte offsets, given the file's encoding.
1663 ** The default value of `load-read-function' is now `read'.
1664 Previously, the default value of `nil' implied using `read'.
1667 ** New hook `pre-redisplay-functions'.
1668 It is a bit easier to use than `pre-redisplay-function'.
1671 ** The second arg of `looking-back' should always be provided explicitly.
1672 Previously, it was an optional argument, now it's mandatory.
1675 ** Text properties `intangible', `point-entered', and `point-left' are obsolete.
1676 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1677 implemented by the new `cursor-intangible-mode' and
1678 `cursor-sensor-mode' minor modes.
1681 ** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
1682 Use the new minor modes `cursor-intangible-mode' and
1683 `cursor-sensor-mode' instead.
1686 ** New process type `pipe', which can be used in combination with the
1687 `:stderr' keyword of make-process to handle standard error output
1691 ** New function `make-process' provides an alternative interface to
1692 `start-process'. It allows programs to set process parameters such as
1693 process filter, sentinel, etc., through keyword arguments (similar to
1694 `make-network-process').
1697 ** A new function `directory-files-recursively' returns all matching
1698 files (recursively) under a directory.
1701 ** New variable `inhibit-message', when bound to non-nil, inhibits
1702 `message' and related functions from displaying messages in the echo
1703 area. The output is still logged to the *Messages* buffer.
1706 ** A new text property `inhibit-read-only' can be used in read-only
1707 buffers to allow certain parts of the text to be writable.
1710 ** A new variable `comment-end-can-be-escaped' is useful in languages
1711 such as C and C++ where line comments with escaped newlines are
1712 continued to the next line.
1715 ** New macro `define-advice'.
1718 ** Emacs Lisp now supports generators.
1719 See the "Generators" section of the ELisp manual for the details.
1722 ** New finalizer facility for running code when objects become unreachable.
1723 See the "Finalizer Type" subsection in the ELisp manual for the
1727 ** lexical closures can use (:documentation FORM) to build their docstring.
1728 It should be placed right where the docstring would be, and FORM is then
1729 evaluated (and should return a string) when the closure is built.
1732 ** define-inline provides a new way to define inlinable functions.
1735 ** New function `macroexpand-1' to perform a single step of macro expansion.
1738 ** Some "x-*" functions were obsoleted and/or renamed:
1739 *** x-select-text is renamed gui-select-text.
1740 *** x-selection-value is renamed gui-selection-value.
1741 *** x-get-selection is renamed gui-get-selection.
1742 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1743 *** x-get-selection-value is renamed to gui-get-primary-selection.
1744 *** x-set-selection is renamed to gui-set-selection
1747 ** New function `string-greaterp', which return the opposite result of
1751 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1752 preserve the collation order as defined by the system's locale(1)
1753 environment. For the time being this is implemented for modern POSIX
1754 systems and for MS-Windows, for other systems they fall back to their
1755 counterparts `string-lessp' and `string-equal'.
1758 ** The new function `string-version-lessp' compares strings by
1759 interpreting consecutive runs of numerical characters as numbers, and
1760 compares their numerical values. According to this predicate,
1761 "foo2.png" is smaller than "foo12.png".
1764 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1765 The effect is that, on systems that use ls-lisp for Dired, the default
1766 sort order of the files in Dired is now different from what it was in
1767 previous versions of Emacs. In particular, the file names are sorted
1768 disregarding punctuation, accents, and diacritics, and letter case is
1769 ignored. For example, files whose name begin with a period will no
1770 longer appear near the beginning of the directory listing. If you
1771 want the old, locale-independent sorting, customize the new option
1772 `ls-lisp-use-string-collate' to the nil value.
1775 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1776 if set to a non-nil value, causes the above 2 functions to ignore
1777 symbol and punctuation characters when collating strings. This
1778 emulates the behavior of modern Posix platforms when the locale's
1779 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1780 MS-Windows doesn't support UTF-8 as codeset in its locales.
1783 ** New function `alist-get', which is also a valid place (aka lvalue).
1786 ** New function `funcall-interactively', which works like `funcall'
1787 but makes `called-interactively-p' treat the function as (you guessed it)
1788 called interactively.
1791 ** New function `function-put' to use instead of `put' for function properties.
1794 ** The new function `bidi-find-overridden-directionality' allows you to
1795 find characters whose directionality was, perhaps maliciously,
1796 overridden by directional override control characters. Lisp programs
1797 can use this to detect potential phishing of URLs and other links that
1798 exploits bidirectional display reordering.
1801 ** The new function `buffer-substring-with-bidi-context' allows you to
1802 copy a portion of a buffer into a different location while preserving
1803 the visual appearance both of the copied text and the text at
1804 destination, even when the copied text includes mixed bidirectional
1805 text and directional control characters.
1808 ** New properties that can be specified with `declare':
1809 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1810 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1811 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1815 ** New macro `with-file-modes', for evaluating expressions with default file
1816 permissions set to temporary values (e.g., for creating private files).
1819 ** You can access the slots of structures using `cl-struct-slot-value'.
1822 ** Function `sort' can deal with vectors.
1825 ** Function `system-name' now returns an updated value if the current
1826 system's name has changed or if the Emacs process has changed systems,
1827 and to avoid long waits it no longer consults DNS to canonicalize the
1828 name. The variable `system-name' is now obsolete.
1831 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1834 ** If `pwd' is called with a prefix argument, insert the current default
1838 ** New functions return extended information about fonts and faces.
1841 *** The function `font-info' now returns more details about a font.
1842 In particular, it now returns the average width of the font's
1843 characters, which can be used for geometry-related calculations.
1846 *** A new function `default-font-width' returns the average width of a
1847 character in the current buffer's default font. If the default face
1848 is remapped (see `face-remapping-alist'), the value for the remapped
1849 face is returned. This function complements the existing function
1850 `default-font-height'.
1853 *** New functions `window-font-height' and `window-font-width' return
1854 the height and average width of characters in a specified face and
1855 window. If FACE is remapped (see `face-remapping-alist'), the
1856 function returns the information for the remapped face.
1859 *** A new function `window-max-chars-per-line' returns the maximal
1860 number of characters that can be displayed on one line. If a face
1861 and/or window are provided, these values are used for the
1862 calculation. This function is different from `window-body-width' in
1863 that it accounts for (i) continuation glyphs, (ii) the size of the
1864 font, and (iii) the specified window.
1867 ** New utilities in subr-x.el:
1868 *** New macros `if-let' and `when-let' allow defining bindings and to
1869 execute code depending whether all values are true.
1870 *** New macros `thread-first' and `thread-last' allow threading a form
1871 as the first or last argument of subsequent forms.
1874 ** Documentation strings now support quoting with curved single quotes
1875 ‘like-this’ in addition to the old style with grave accent and
1876 apostrophe `like-this'. The new style looks better on today's displays.
1877 In the new Electric Quote mode, you can enter curved single quotes
1878 into documentation by typing ` and '. Outside Electric Quote mode,
1879 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1880 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1881 ‘text-quoting-style’, the user can specify how to display doc string
1885 ** New function ‘format-message’ is like ‘format’ and also converts
1886 curved single quotes, grave accents and apostrophes as per
1887 ‘text-quoting-style’.
1890 ** show-help-function's arg is converted via substitute-command-keys
1891 before being passed to the function. Help strings, help-echo
1892 properties, etc. can therefore contain command key escapes and
1896 ** Time-related changes:
1898 *** Time conversion functions now accept an optional ZONE argument
1899 that specifies the time zone rules for conversion. ZONE is omitted or
1900 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1901 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1902 rule. The affected functions are ‘current-time-string’,
1903 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1904 function ‘encode-time’, which already accepted a simple time zone rule
1905 argument, has been extended to accept all the new forms.
1907 *** Time-related functions now consistently accept numbers
1908 (representing seconds since the epoch) and nil (representing the
1909 current time) as well as the usual list-of-integer representation.
1910 Affected functions include `current-time-string', `current-time-zone',
1911 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1912 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1913 `time-to-days', and `time-to-seconds'.
1915 *** The `encode-time-value' and `with-decoded-time-value' macros have
1918 *** `calendar-next-time-zone-transition', `time-add', and
1919 `time-subtract' no longer return time values in the obsolete and
1920 undocumented integer-pair format. Instead, they return a list of two
1924 ** New function `set-binary-mode' allows switching a standard stream
1925 of the Emacs process to binary I/O mode.
1928 ** The new function `directory-name-p' can be used to check whether a file
1929 name (as returned from, for instance, `file-name-all-completions') is
1930 a directory file name. It returns non-nil if the last character in
1931 the name is a directory separator character (forward slash on GNU and
1932 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1935 ** ASCII approximations to curved quotes are put in standard-display-table
1936 if the terminal cannot display curved quotes.
1939 ** Standard output and error streams now transliterate characters via
1940 standard-display-table, and encode output using locale-coding-system.
1941 To force a specific encoding, bind `coding-system-for-write' to the
1942 coding-system of your choice when invoking functions like `prin1' and
1946 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1949 ** New possible value for `system-type': `nacl'.
1950 This is used by Google's Native Client (NaCl).
1952 ** Miscellaneous name change
1955 For consistency with the usual Emacs spelling, the Lisp variable
1956 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1957 The old name should still work, as an obsolescent alias.
1959 ** Changes in Frame- and Window- Handling
1962 *** Emacs can now draw horizontal scroll bars on some platforms that
1963 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1964 Horizontal scroll bars are turned off by default.
1966 **** New function `horizontal-scroll-bars-available-p' telling whether
1967 horizontal scroll bars are available on the underlying system.
1969 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1970 bars on all existing and future frames.
1972 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1973 scroll bars on the selected frame.
1975 **** New frame parameters `horizontal-scroll-bars' and
1976 `scroll-bar-height' to set horizontal scroll bars and their height
1977 for individual frames and in `default-frame-alist'.
1979 **** New functions `frame-scroll-bar-height' and
1980 `window-scroll-bar-height' return the height of horizontal scroll
1981 bars on a specific frame or window.
1983 **** `set-window-scroll-bars' now accepts five parameters where the last
1984 two specify height and type of the window's horizontal scroll bar.
1986 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
1989 **** New buffer-local variables `horizontal-scroll-bar' and
1990 `scroll-bar-height'.
1993 *** New functions `frame-geometry' and `frame-edges' give access to a
1997 *** New functions `mouse-absolute-pixel-position' and
1998 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
2002 *** The function `window-edges' now accepts three additional arguments to
2003 retrieve body, absolute and pixel edges of the window.
2006 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
2007 `window-inside-absolute-pixel-edges' have been renamed to respectively
2008 `window-body-edges', `window-body-pixel-edges' and
2009 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
2012 *** New function `window-absolute-pixel-position' to get the screen
2013 coordinates of a visible buffer position.
2016 *** The height of a frame's menu and tool bar are no longer counted in the
2017 frame's text height. This means that the text height stands only for
2018 the height of the frame's root window plus that of the echo area (if
2019 present). This was already the behavior for frames with external tool
2020 and menu bars (like in the Gtk builds) but has now been extended to all
2024 *** Frames now do not necessarily preserve the number of columns or lines
2025 they display when setting default font, menu bar, fringe width, or
2026 scroll bars. In particular, maximized and fullscreen frames are
2027 conceptually never resized if such settings change. For fullheight and
2028 fullwidth frames, the behavior may depend on the toolkit used.
2029 **** New option `frame-inhibit-implied-resize' if non-nil, means that
2030 setting default font, menu bar, fringe width, or scroll bars of a
2031 specific frame does not resize that frame in order to preserve the
2032 number of columns or lines it displays.
2035 *** New function `window-preserve-size' allows you to preserve the size of
2036 a window without "fixing" it. It's supported by `fit-window-to-buffer',
2037 `temp-buffer-resize-mode' and `display-buffer'.
2040 *** New `display-buffer' action function `display-buffer-use-some-frame'.
2041 This displays the buffer in an existing frame other than the current
2042 frame, and allows the caller to specify a frame predicate to exclude
2046 *** New minor mode `window-divider-mode' and options
2047 `window-divider-default-places', `window-divider-default-bottom-width'
2048 and `window-divider-default-right-width'.
2051 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2052 Those features have been deprecated in Gtk+ for a long time.
2057 *** etags no longer qualifies class members by default.
2059 By default, `etags' will not qualify class members for C-like
2060 object-oriented languages with their class names and namespaces, and
2061 will remove qualifications used explicitly in the code from the tag
2062 names it puts in TAGS files. This is so the etags.el back-end for
2063 `xref-find-definitions' is more accurate and produces less false
2066 Use --class-qualify (-Q) if you want the old default behavior of
2067 qualifying class members in C++, Java, and Objective C. Note that
2068 using -Q might make some class members become "unknown" to `M-.'
2069 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
2070 qualified names by hand.
2073 *** New language Ruby
2075 Names of modules, classes, methods, functions, and constants are
2076 tagged. Overloaded operators are also tagged.
2080 Names of packages, functions, and types are tagged.
2083 *** Improved support for Lua
2085 Etags now tags functions even if the "function" keyword follows some
2086 whitespace at line beginning.
2089 * Changes in Emacs 25.1 on Non-Free Operating Systems
2092 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2093 This includes the makefile.w32-in files in various subdirectories, and
2094 the support files. The file nt/configure.bat now just tells the user
2095 to use the procedure described in nt/INSTALL, by running the Posix
2096 `configure' script in the top-level directory.
2099 ** Building Emacs for MS-Windows requires at least Windows XP
2100 or Windows Server 2003. The built binaries still run on all versions
2101 of Windows starting with Windows 9X.
2104 ** Emacs running on MS-Windows now supports the daemon mode.
2107 ** The byte counts in etags-generated TAGS files are now the same on
2108 MS-Windows as they are on other platforms.
2111 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2112 Pass '--without-ns' to configure to create an X11 build, the old default.
2115 ** OS X 10.5 or older is no longer supported.
2118 ** OS X on PowerPC is no longer supported.
2121 ** New variable `ns-use-fullscreen-animation' controls animation for
2122 non-native NS fullscreen. The default is nil. Set to t to enable
2123 animation when entering and leaving fullscreen. For native OSX fullscreen
2127 ** The new function 'w32-application-type' returns the type of an
2128 MS-Windows application given the name of its executable program file.
2130 ** New variable `w32-pipe-buffer-size'.
2131 It can be used to tune the size of the buffer of pipes created for
2132 communicating with subprocesses, when the program run by a subprocess
2133 exhibits unusual buffering behavior. Default is zero, which lets the
2134 OS use its default size.
2137 ----------------------------------------------------------------------
2138 This file is part of GNU Emacs.
2140 GNU Emacs is free software: you can redistribute it and/or modify
2141 it under the terms of the GNU General Public License as published by
2142 the Free Software Foundation, either version 3 of the License, or
2143 (at your option) any later version.
2145 GNU Emacs is distributed in the hope that it will be useful,
2146 but WITHOUT ANY WARRANTY; without even the implied warranty of
2147 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2148 GNU General Public License for more details.
2150 You should have received a copy of the GNU General Public License
2151 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2157 paragraph-separate: "[
\f]*$"