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
34 ** It is possible to disable attempted recovery on fatal signals
36 Two new variables allow to disable attempts to recover from stack
37 overflow and to avoid automatic auto-save when Emacs is delivered a
38 fatal signal. `attempt-stack-overflow-recovery', if set to `nil',
39 will disable attempts to recover from C stack overflows; Emacs will
40 then crash as with any other fatal signal.
41 `attempt-orderly-shutdown-on-fatal-signal', if set to `nil', will
42 disable attempts to auto-save the session and shut down in an orderly
43 fashion when Emacs receives a fatal signal; instead, Emacs will
44 terminate immediately. Both variables are non-`nil' by default.
45 These variables are for users who would like to avoid the small
46 probability of data corruption due to techniques Emacs uses to recover
50 * Editing Changes in Emacs 25.2
53 * Changes in Specialized Modes and Packages in Emacs 25.2
58 *** A new `s' command for switching to another eww buffer via the minibuffer.
61 ** The commands that add ChangeLog entries now prefer a VCS root directory
62 for the ChangeLog file, if none already exists. Customize
63 `change-log-directory-files' to nil for the old behavior.
66 ** Support for non-string values of `time-stamp-format' has been removed.
71 *** New connection method "sg", which allows to edit files under
75 *** New connection method "doas" for OpenBSD hosts.
78 * New Modes and Packages in Emacs 25.2
81 * Incompatible Lisp Changes in Emacs 25.2
84 * Lisp Changes in Emacs 25.2
86 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
88 ** Autoload files can be generated without timestamps,
89 by setting `autoload-timestamps' to nil.
92 * Changes in Emacs 25.2 on Non-Free Operating Systems
95 * Installation Changes in Emacs 25.1
98 ** Building Emacs now requires C99 or later.
101 ** Building Emacs now requires GNU make, version 3.81 or later.
104 ** New configure option --with-cairo.
105 This builds Emacs with Cairo drawing. As a side effect, it provides
106 support for built-in printing, when Emacs was built with GTK+.
107 Cairo drawing is an experimental feature in Emacs, and subject to
108 change in future releases.
111 ** New configure option --with-modules.
112 This enables support for loading dynamic modules; see below.
115 ** By default, Emacs no longer works on IRIX. We expect that Emacs
116 users are not affected by this, as SGI stopped supporting IRIX in
117 December 2013. If you are affected, please send a bug report. You
118 should be able to work around the problem either by porting the Emacs
119 undumping code to GCC under IRIX, or by configuring --with-wide-int,
120 or by sticking with Emacs 24.4.
123 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
124 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
125 since Emacs 24.4, and the other variants were undocumented and were
126 obstacles to maintenance and development. GC_MARK_STACK and its
127 related symbols have been removed from the C internals.
130 ** 'configure' now prefers gnustep-config when configuring GNUstep.
131 If gnustep-config is not available, the old heuristics are used.
134 ** 'configure' now prefers inotify to gfile for file notification,
135 unless gfile is explicitly requested via --with-file-notification='gfile'.
138 ** 'configure' detects the kqueue file notification library on *BSD
139 and Mac OS X machines.
142 ** The configure option '--with-pkg-config-prog' has been removed.
143 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
146 ** The configure option '--with-mmdf' has been removed.
147 It was no longer useful, as it relied on libraries that are no longer
148 supported, and its presence led to confusion during configuration.
149 This affects only the 'movemail' utility; Emacs itself can still
150 process MMDF-format files as before.
153 ** The configure option '--enable-silent-rules' is now the default,
154 and silent rules are now quieter. To get the old behavior where
155 'make' chatters a lot, configure with '--disable-silent-rules' or
156 build with 'make V=1'.
159 ** The configure option '--with-gameuser' now allows you to specify a
160 group instead of a user if its argument is prefixed by ':' (a colon).
161 This will cause the game score files in ${localstatedir}/games/emacs
162 to be owned by that group, and the helper program for updating them to
163 be installed setgid. The option now defaults to the 'games' group.
166 ** The `grep-changelog' script (and its manual page) are no longer included.
167 It has no particular connection to Emacs and has not changed in years,
168 so if you want to use it, you can always take a copy from an older Emacs.
171 ** Emacs 25 comes with a new set of icons.
172 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
173 The old Emacs logo icons are available as `emacs23.png' in the same location.
176 ** New make target `check-expensive' to run additional tests.
177 This includes all tests which run via "make check", plus additional
178 tests which take more time to perform.
181 * Startup Changes in Emacs 25.1
184 ** When Emacs is given a file as a command line argument and
185 `initial-buffer-choice' is non-nil, display both the file and
186 `initial-buffer-choice'. When Emacs is given more than one file and
187 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
188 and *Buffer List*. This makes Emacs convenient to use from the
189 command line when `initial-buffer-choice' is non-nil.
192 ** The value of ‘initial-scratch-message’ is now treated as a doc string
193 and can contain escape sequences for command keys, quotes, and the like.
196 * Changes in Emacs 25.1
199 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
200 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
201 xwidget support, you can access the embedded webkit browser with `M-x
202 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
203 browser. The buffer will have a new mode, `xwidget-webkit-mode'
204 (similar to `image-mode'), which supports the webkit widget.
207 *** New functions for xwidget-webkit mode `xwidget-webkit-insert-string',
208 `xwidget-webkit-adjust-size-dispatch', `xwidget-webkit-back',
209 `xwidget-webkit-browse-url', `xwidget-webkit-reload',
210 `xwidget-webkit-current-url', `xwidget-webkit-scroll-backward',
211 `xwidget-webkit-scroll-forward', `xwidget-webkit-scroll-down',
212 `xwidget-webkit-scroll-up'.
215 ** Emacs can now load shared/dynamic libraries (modules).
216 A dynamic Emacs module is a shared library that provides additional
217 functionality for use in Emacs Lisp programs, just like a package
218 written in Emacs Lisp would. The functions `load', `require',
219 `load-file', etc. were extended to load such modules, as they do with
220 Emacs Lisp packages. The new variable `module-file-suffix' holds the
221 system-dependent value of the file-name extension (`.so' on Posix
222 hosts) of the module files.
224 A module should export a C-callable function named
225 `emacs_module_init', which Emacs will call as part of the call to
226 `load' or `require' which loads the module. It should also export a
227 symbol named `plugin_is_GPL_compatible' to indicate that its code is
228 released under the GPL or compatible license; Emacs will refuse to
229 load modules that don't export such a symbol.
231 If a module needs to call Emacs functions, it should do so through the
232 API defined and documented in the header file `emacs-module.h'. Note
233 that any module that provides Lisp-callable functions will have to use
234 Emacs functions such as `fset' and `funcall', in order to register its
235 functions with the Emacs Lisp interpreter.
237 Modules can create `user-ptr' Lisp objects that embed pointers to C
238 struct's defined by the module. This is useful for keeping around
239 complex data structures created by a module, to be passed back to the
240 module's functions. User-ptr objects can also have associated
241 "finalizers" -- functions to be run when the object is GC'ed; this is
242 useful for freeing any resources allocated for the underlying data
243 structure, such as memory, open file descriptors, etc. A new
244 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
247 Loadable modules in Emacs are an experimental feature, and subject to
248 change in future releases. For that reason, their support is disabled
249 by default, and must be enabled by using the `--with-modules' option
253 ** A second dir-local file (.dir-locals-2.el) is now accepted.
254 See the variable `dir-locals-file-2' for more information.
257 ** Network security (TLS/SSL certificate validity and the like) is
258 added via the new Network Security Manager (NSM) and controlled via
259 the `network-security-level' variable.
262 ** International domain names (IDNA) are now encoded via the new
263 puny.el library, so that one can visit web sites like
264 "http://méxico.icom.museum".
267 ** C-h l now also lists the commands that were run.
269 ** The new M-s M-w key binding uses eww to search the web for the
273 ** The new `timer-list' command lists all active timers in a buffer
274 where you can cancel them with the `c' command.
276 ** M-x suggests shorthands and ignores obsolete commands for completion.
277 ** x-select-enable-clipboard is renamed select-enable-clipboard.
278 x-select-enable-primary and renamed select-enable-primary.
279 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
280 name it), with the proviso that on some systems (e.g. Windows)
281 select-enable-primary is ineffective since the system doesn't
282 have the equivalent of a primary selection.
285 ** New option `switch-to-buffer-in-dedicated-window' allows you to
286 customize how `switch-to-buffer' proceeds interactively when the
287 selected window is strongly dedicated to its buffer.
290 ** The option `even-window-heights' has been renamed to
291 `even-window-sizes' and now handles window widths as well.
294 ** New function `read-multiple-choice' use to prompt for
295 multiple-choice questions, with a handy way to display help texts.
298 ** terpri gets an optional arg ENSURE to conditionally output a newline.
301 ** `insert-register' now leaves point after the inserted text
302 when called interactively. A prefix argument toggles this behavior.
305 ** The new variable `term-file-aliases' replaces some files from lisp/term.
306 The function `tty-run-terminal-initialization' consults this variable
307 when deciding what terminal-specific initialization code to run.
310 ** New variable `system-configuration-features', listing some of the
311 main features that Emacs was compiled with. This is mainly intended
312 for use in Emacs bug reports.
315 ** A password is now hidden also when typed in batch mode. Another
316 hiding character but the default `.' can be used by let-binding the
317 variable `read-hide-char'.
320 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
323 * Editing Changes in Emacs 25.1
326 ** M-x suggests shorthands and ignores obsolete commands for completion.
331 *** Successive single-char deletions are collapsed in the undo-log just like
332 successive char insertions. Which commands invoke this behavior is
333 controlled by the new `undo-auto-amalgamate' function. See the node
334 "Undo" in the ELisp manual for more details.
337 *** The heuristic used to insert `undo-boundary' after each command
338 has changed, so that if a command causes changes in more than just the
339 current buffer, Emacs now calls `undo-boundary' in every buffer
340 affected by the command.
343 ** New command `comment-line' bound to `C-x C-;'.
345 ** New and improved facilities for inserting Unicode characters
348 *** Unicode names entered via C-x 8 RET now use substring completion by default.
351 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
352 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
355 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
356 as you type. See also the new variable ‘text-quoting-style’.
359 ** New minor mode global-eldoc-mode is enabled by default.
362 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
363 Bracketed paste mode causes text terminals to wrap pasted text in special
364 escape sequences that allow Emacs to tell the difference between text
365 you type and text you paste from other applications. Emacs then
366 avoids interpreting each character in the pasted text as it does with
367 keyboard input, which results in a paste experience similar to that
368 under a window system, and significant performance improvements when
369 pasting large amounts of text.
371 Bracketed paste mode is disabled by default, so Emacs automatically
372 enables it at startup if the terminal supports it.
375 ** Emacs now supports the latest version of the UBA.
376 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
377 was updated to support all the latest additions and changes introduced
378 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
379 This includes full support for directional isolates and the
380 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
384 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
387 ** New buffer-local `electric-pair-local-mode'.
390 ** New variable `fast-but-imprecise-scrolling' inhibits
391 fontification during full screen scrolling operations, giving less
392 hesitant operation during auto-repeat of C-v, M-v at the cost of
393 possible inaccuracies in the end position.
396 ** New documentation command `describe-symbol'.
397 Works for functions, variables, faces, etc. It is bound to `C-h o' by
401 ** New function `custom-prompt-customize-unsaved-options' checks for
402 unsaved customizations and prompts user to customize (if found). It
403 is intended for adding to 'kill-emacs-query-functions'.
406 * Changes in Specialized Modes and Packages in Emacs 25.1
411 *** New command `checkdoc-package-keywords' checks if the
412 current package keywords are recognized. Set the new option
413 `checkdoc-package-keywords-flag' to non-nil to make
414 `checkdoc-current-buffer' call this function automatically.
417 *** New function `checkdoc-file' checks for style errors.
418 It's meant for use together with `compile':
419 emacs -batch --eval "(checkdoc-file \"subr.el\")"
424 *** The desktop format version has been upgraded from 206 to 208.
425 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
426 cannot read a version 208 desktop. To upgrade your desktop file, you
427 must explicitly request the upgrade, by C-u M-x desktop-save. You are
428 recommended to do this as soon as you have firmly upgraded to Emacs
429 25.1 (or later). Should you ever need to downgrade your desktop file
430 to version 206, you can do this with C-u C-u M-x desktop-save.
433 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
434 It raises an error if a bookmark of that name already exists,
435 unlike `bookmark-set' which silently updates an existing bookmark.
440 *** New user options `mm-html-inhibit-images' and `mm-html-blocked-images'
441 now control how mm-* functions fetch and display images in an HTML
442 message. Gnus still uses `gnus-inhibit-images' and `gnus-blocked-images'
443 for that purpose, i.e., binds mm-html- variables with those gnus-
444 variables, but other packages do not have to bind gnus- variables now.
447 *** `mm-inline-text-html-with-images' has been removed.
448 Use `mm-html-inhibit-images' instead. Note that the value is opposite
454 *** `imap-ssl-program' has been removed, and imap.el uses the internal
455 GnuTLS encryption functions if possible.
460 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
461 the ordering of object keys by default.
464 *** New commands `json-pretty-print-ordered' and
465 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
466 object keys sorted alphabetically.
469 ** Prog mode has some support for multi-mode indentation.
470 This allows better indentation support in modes that support multiple
471 programming languages in the same buffer, like literate programming
472 environments or ANTLR programs with embedded Python code.
474 A major mode can provide indentation context for a sub-mode through
475 the `prog-indentation-context' variable. To support this, modes that
476 provide indentation should use `prog-widen' instead of `widen' and
477 `prog-first-column' instead of a literal zero. See the node
478 "Mode-Specific Indent" in the ELisp manual for more details.
480 ** Prettify Symbols mode
483 *** Prettify Symbols mode supports custom composition predicates. By
484 overriding the default `prettify-symbols-compose-predicate', modes can
485 specify in which contexts a symbol may be displayed as some Unicode
486 character. `prettify-symbols-default-compose-p' is the default which
487 is suitable for most programming languages such as C or Lisp (but not
491 *** Symbols can be unprettified while point is inside them.
492 New variable `prettify-symbols-unprettify-at-point' configures this.
494 ** Enhanced xterm support
497 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
498 This variable tells Emacs which advanced capabilities are available in
499 the xterm terminal emulator used to display Emacs text-mode frames.
500 The default is to check each capability, and use it if available.
501 (This variable was introduced in Emacs 24.1, but was not announced in
505 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
506 in the surrounding GUI (using the OSC-52 escape sequence). This only works
507 if your xterm supports it and enables the `allowWindowOps' options (disabled
508 by default at least in Debian, for security reasons).
510 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
511 escape sequence) if your xterm has the feature enabled but for that you
512 additionally need to add `getSelection' to `xterm-extra-capabilities'.
515 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
518 ** The `save-place' variable is replaced by `save-place-mode'.
523 *** ERC can now hide message types by network or channel.
524 `erc-hide-list' will hide all messages of the specified type, while
525 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
526 specified message types for the respective specified targets.
528 *** New variable `erc-default-port-tls' used to connect to TLS IRC
532 *** Reconnection is now asynchronous.
535 *** Nick completion is now case-insensitive again after inadvertently
536 being made case-sensitive in Emacs 24.2.
541 *** New commands, key binds, and menu items.
543 **** `<' and `>' for navigating previous and next tracks in playlist
545 **** New play/pause command `mpc-toggle-play' bound to `s'
547 **** `g' bound to new command `mpc-seek-current' will navigate current
550 **** New commands `mpc-toggle-{consume,repeat,single,shuffle}' for
551 toggling playback modes.
554 *** Now supports connecting to a UNIX domain socket.
557 *** Looks at more image file names to use as album art.
558 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
559 (XP) in addition to cover.jpg.
562 *** Searches in more locations for MPD configuration files.
563 MPD supports the XDG base directory specification since version 0.17.6.
568 *** `midnight-mode' is now a proper minor mode.
571 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
576 *** New "external" package status.
577 An external package is any installed package that's not built-in and
578 not from `package-user-dir', which usually means it's from an entry in
579 `package-directory-list'. They are treated much like built-in
580 packages, in that they cannot be deleted through the package menu and
581 are not considered for upgrades.
583 The effect is that a user can manually place a specific version of a
584 package inside `package-directory-list' and the package menu will
588 *** If a package is available on multiple archives and one has higher
589 priority (as per `package-archive-priorities') only that one is
590 listed. This can be configured with `package-menu-hide-low-priority'.
593 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
594 This includes the above-mentioned low-priority packages, as well as
595 available packages whose version is lower than the currently installed
596 version (which were previously impossible to display).
597 This allows users to downgrade a package if a lower version is
601 *** When filtering the package menu, keywords starting with "arc:" or
602 "status:" represent package archive or status, respectively, instead
606 *** Most functions which involve downloading information now take an
607 ASYNC argument. If it is non-nil, package.el performs the download(s)
611 *** New variable `package-menu-async' controls whether the
612 package-menu uses asynchronous downloads.
615 *** `package-install-from-buffer' and `package-install-file' work on directories.
616 This follows the same rules as installing from a .tar file, except the
617 -pkg file is optional.
620 *** Packages which are dependencies of other packages cannot be deleted.
621 The FORCE argument to `package-delete' overrides this.
624 *** New custom variable `package-selected-packages' tracks packages
625 which were installed by the user (as opposed to installed as
626 dependencies). This variable can also be manually customized.
629 *** New command `package-install-selected-packages' installs all
630 packages from `package-selected-packages' which are currently missing.
633 *** New command `package-autoremove' removes all packages which were
634 installed strictly as dependencies but are no longer needed.
639 When you invoke `shell' interactively, the *shell* buffer will now
640 display in a new window. However, you can customize this behavior via
641 the `display-buffer-alist' variable. For example, to get
642 the old behavior -- *shell* buffer displays in current window -- use
643 (add-to-list 'display-buffer-alist
644 '("^\\*shell\\*$" . (display-buffer-same-window))).
648 *** The `:protection' slot option is not obeyed any more.
650 *** The `newname' argument to constructors is optional&deprecated.
651 If you need your objects to be named, do it by inheriting from `eieio-named'.
653 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
655 *** The <class> variables are declared obsolete.
657 *** The <initarg> variables are declared obsolete.
659 *** defgeneric and defmethod are declared obsolete.
660 Use the equivalent facilities from cl-generic.el instead.
662 *** `constructor' is now an obsolete alias for `make-instance'.
663 --- `pcase' accepts a new UPattern `eieio'.
668 *** New command `ido-bury-buffer-at-head' bound to C-S-b
669 Bury the buffer at the head of `ido-matches', analogous to how C-k
670 kills the buffer at head.
673 *** A prefix argument to `ido-restrict-to-matches' will reverse its
674 meaning, and the list is restricted to those elements that do not
675 match the current input.
680 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
681 The new commands `next-line-or-history-element' and
682 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
683 minibuffer, allow by-line movement through minibuffer history,
684 similarly to an ordinary buffer. Only when point moves over
685 the bottom/top of the minibuffer it goes to the next/previous history
686 element. `M-p' and `M-n' still move directly to previous/next history
689 ** Search and Replace
692 *** New user option `search-default-mode'
693 specifies the default mode for I-search.
696 *** `isearch' and `query-replace' can now perform character folding in matches.
697 Isearch does that by default, while `query-replace' will do that if
698 the new variable `replace-character-fold' is customized to a non-nil
699 value. This is analogous to case folding, but instead of disregarding
700 case variants, it disregards wider classes of distinctions between
701 similar characters. (Case folding is a special case of character
702 folding.) This means many characters in the search string will match
703 entire groups of characters instead of just themselves.
705 For instance, the " will match all variants of double quotes (like “
706 and ”), and the letter a will match all of its accented cousins, even
707 those composed of multiple characters, as well as many other symbols
711 *** New function `character-fold-to-regexp' can be used
712 by searching commands to produce a regexp matching anything that
713 character-folds into STRING.
716 *** The new M-s M-w key binding uses eww to search the web for the
717 text in the region. The search engine to use for this is specified by
718 the customizable variable `eww-search-prefix'.
721 *** Query-replace history is enhanced.
722 When query-replace reads the FROM string from the minibuffer, typing
723 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
724 and TO are the original text and its replacement, and SEP is an arrow
725 string defined by the new variable `query-replace-from-to-separator'.
726 To select a prior replacement, type `M-p' until the desired
727 replacement appears in the minibuffer, and then exit the minibuffer by
732 *** If `quick-calc' is called with a prefix argument, insert the
733 result of the calculation into the current buffer.
736 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
737 this you can tell Edebug not to stop at the start of the first
738 instrumented function.
743 *** New minor mode `global-eldoc-mode'
744 It is turned on by default, and affects `*scratch*' and other buffers
745 whose major mode supports Emacs Lisp.
748 *** `eldoc-documentation-function' now defaults to `ignore'
751 *** `describe-char-eldoc' displays information about character at point,
752 and can be used as a default value of `eldoc-documentation-function'. It is
753 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
754 ] [, ] [, etc.) while using mono-spaced font.
759 *** HTML can now be rendered using variable-width fonts.
762 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
763 whether to use variable-pitch fonts or not. The user can also
764 customize the `shr-use-fonts' variable.
767 *** A new command `C' (`eww-toggle-colors') can be used to toggle
768 whether to use the HTML-specified colors or not. The user can also
769 customize the `shr-use-colors' variable.
772 *** A new command `R' (`eww-readable') will try do identify the main
773 textual parts of a web page and display only that, leaving menus and
774 the like off the page.
777 *** You can now use several eww buffers in parallel by renaming eww
778 buffers you want to keep separate.
781 *** Partial state of the eww buffers (the URIs and the titles of the
782 pages visited) is now preserved in the desktop file.
785 *** `eww-after-render-hook' is now called after eww has rendered
786 the data in the buffer.
789 *** The `eww-reload' command now takes a prefix to not reload via
790 the net, but just use the local copy of the HTML.
793 *** The DOM shr and eww uses has been changed to the general Emacs
794 xml.el/libxml2 DOM, and a new package dom.el has been added to
795 interact with this DOM. See the Emacs Lisp manual for interface
799 *** `mailcap-mime-data' is now consulted when displaying PDF files.
802 *** The new `S' command will list all eww buffers, and allow managing
806 *** https pages with valid certificates have headers marked in green, while
807 invalid certificates are marked in red.
812 *** text/html messages that contain inline image parts will be
813 transformed into multipart/related messages before sending.
816 *** The `message-valid-fqdn-regexp' variable has been removed, since
817 there are now top-level domains added all the time. Message will no
818 longer warn about sending emails to top-level domains it hasn't heard
821 *** `message-beginning-of-line' (bound to C-a) understands folded headers.
822 In `visual-line-mode' it will look for the true beginning of a header
823 while in non-`visual-line-mode' it will move the point to the indented
827 ** In Show Paren Mode, a parenthesis can be highlighted when point
828 stands inside it, and certain parens can be highlighted when point is
829 at BOL or EOL, or in whitespace there. To enable these, customize,
830 respectively, `show-paren-when-point-inside-paren' or
831 `show-paren-when-point-in-periphery'.
834 ** If gpg2 exists on the system, it is now used as the default value
835 of `epg-gpg-program' (instead of gpg).
840 *** Images are automatically scaled before displaying based on the
841 `image-scaling-factor' variable (if Emacs supports scaling the images
844 *** Images inserted with `insert-image' and related functions get a
845 keymap put into the text properties (or overlays) that span the
846 image. This keymap binds keystrokes for manipulating size and
847 rotation, as well as saving the image to a file.
852 *** Strings after `:documentation' are highlighted as docstrings.
853 This enhances Lisp mode fontification to handle documentation of the
854 form `(:documentation "the doc string")' used in Common Lisp code for
855 CLOS class and slot documentation.
860 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
863 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
864 *** `string-rectangle' provides on-the-fly preview of the result.
867 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
868 These should be used in preference to `font-lock-fontify-buffer' when
872 ** Macro `minibuffer-with-setup-hook' can optionally append a function
873 to `minibuffer-setup-hook'.
875 If the first argument of the macro is of the form `(:append FUN)',
876 then FUN will be appended to `minibuffer-setup-hook', instead of
881 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
884 *** `pcase' accepts the new UPattern `cl-struct'.
886 ** Calendar and diary
889 *** The default `diary-file' is now located in .emacs.d.
892 *** New commands to insert diary entries with Chinese dates:
893 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
894 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
897 *** The calendar can now list and mark diary entries with Chinese dates.
898 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
901 *** The option `calendar-mode-line-format' can now be nil,
902 which means to do nothing special with the mode line in calendars.
905 *** New option `calendar-weekend-days'.
906 The option customizes which day headers receive the
907 `calendar-weekend-header' face.
910 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
913 *** Many items obsolete since at least version 23.1 have been removed.
914 The majority were function/variable/face aliases, too numerous to list here.
917 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
918 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
920 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
922 **** Macro `calendar-for-loop'.
924 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
926 **** The nil and list forms of `diary-display-function'.
929 ** New ERT function `ert-summarize-tests-batch-and-exit'.
930 If the output of ERT tests in batch mode execution can be saved to a
931 log file, then it can be passed as an argument to the above function
932 to produce a neat summary.
935 ** New js.el option `js-indent-first-init'.
936 It was renamed from `js-indent-first-initialiser', to avoid issues
937 with American vs British spelling.
942 ** Info mode now displays symbol names in fixed-pitch font.
943 If you want to get the old behavior back, customize the `Info-quoted'
944 face to use the same definitions as the default face.
947 *** `Info-fontify-maximum-menu-size' can be t for no limit.
950 *** `info-display-manual' can now be given a prefix argument which (any
951 non-nil value) directs the command to limit the completion
952 alternatives to currently visited manuals.
955 ** ntlm.el has support for NTLM2.
960 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
961 to delete or undelete multiple messages.
964 *** Rmail can now render HTML mail messages if your Emacs was built with
965 libxml2 or if you have the Lynx browser installed. By default, Rmail
966 will display the HTML version of a mail message that has both HTML and
967 plain text parts, if display of HTML email is possible; customize the
968 `rmail-mime-prefer-html' option to `nil' if you don't want that.
971 *** In the commands that make summaries by subject, recipients, or senders,
972 you can no longer use commas to separate regular expressions.
975 ** SES now supports local printer functions; see `ses-define-local-printer'.
979 *** In sh-mode you can now use `sh-shell' as a file-local variable to
980 specify the type of shell in use (bash, csh, etc).
983 *** New value `always' for `sh-indent-after-continuation'.
984 This provides old-style ("dumb") indentation of continued lines.
985 See the doc string of `sh-indent-after-continuation' for details.
989 *** Fatal TLS errors are now silent by default.
992 *** If Emacs isn't built with TLS support, an external TLS-capable
993 program is used instead. This program used to be run in --insecure
994 mode by default, but has now changed to be secure instead, and will
995 fail if you try to connect to non-verifiable hosts. This is
996 controlled by the `tls-program' variable.
1001 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1002 When `url-handler-mode' is enabled, file operations for these
1003 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1006 *** The URL package allows customizing the `url-user-agent' string.
1007 The new `url-user-agent' variable can be customized to be a string or
1011 *** The new interface variable `url-request-noninteractive' can be used
1012 to specify that we're running in a noninteractive context, and that
1013 we should not be queried about things like TLS certificate validity.
1016 *** If URL is used with a https connection, the first callback argument
1017 plist will contain a :peer element that has the output of
1018 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
1023 *** New connection method "afp", which allows you to access Mac OS X
1024 volumes via the Apple Filing Protocol.
1027 *** New connection method "nc", which allows you to access dumb
1031 *** Method-specific parameters can be overwritten now with variable
1032 `tramp-connection-properties'.
1035 *** Handler for `file-notify-valid-p' for remote machines that support
1036 filesystem notifications.
1041 *** New user variable `sql-default-directory' enables remote
1042 connections using Tramp.
1045 *** New command `sql-send-line-and-next'.
1046 This command, bound to `C-c C-n' by default, sends the current line to
1047 the SQL process and advances to the next line, skipping whitespace and
1051 *** Added support for Vertica SQL.
1053 ** VC and related modes
1056 *** Basic push support, via `vc-push', bound to `C-x v P'.
1057 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1058 (undocumented) command vc-hg-push now behaves slightly differently.
1061 *** The new command vc-region-history shows the log+diff of the active region.
1064 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
1065 This command is useful when you perform version control commands
1066 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1067 back-end for the buffer's file, or remove it from version control.
1070 *** New option `vc-annotate-background-mode' controls whether
1071 the color range from `vc-annotate-color-map' is applied to the
1072 background or to the foreground.
1075 *** `compare-windows' now compares text with the most recently selected window
1076 instead of the next window. If you want the previous behavior of
1077 comparing with the next window, customize the new option
1078 `compare-windows-get-window-function' to the value
1079 `compare-windows-get-next-window'.
1082 *** Two new faces `compare-windows-removed' and `compare-windows-added'
1083 replace the face `compare-windows', which is now an obsolete alias for
1084 `compare-windows-added'.
1087 *** The VC state indicator in the mode line now has different faces
1088 corresponding to each of the possible states. See the `vc-faces'
1089 customization group.
1092 *** `log-edit-insert-changelog' converts "(tiny change)" to
1093 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
1094 nil to disable this.
1097 ** VHDL mode now supports VHDL'08.
1102 *** Decimal display mode uses "," groups, so it's more
1103 fitting for use in money calculations
1106 *** Factorial works with non-integer inputs.
1111 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1112 macro argument expansion, interactive macro evaluation and automatic
1113 scanning of #define'd symbols.
1116 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
1117 result of evaluating a macro.
1120 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
1121 all defined symbols in `hide-ifdef-env'.
1124 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
1125 file name patterns. Defaults to files whose extension is one of `.h',
1126 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
1129 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
1130 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1131 (This could happen when an idempotent header file is visited again,
1132 when its guard symbol is already defined.) Defaults to `t'.
1135 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
1136 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1137 looking for macro definitions. By default, no symbols are ignored.
1142 *** New custom variable `tex-print-file-extension' to help users who
1143 use PDF instead of DVI.
1146 *** TeX mode now supports Prettify Symbols mode. When enabling
1147 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1148 many other math macros are displayed using unicode characters.
1151 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
1152 By default, 32 consecutive spaces or four consecutive TABs are
1153 considered to be too deep, but the new variable
1154 `whitespace-big-indent-regexp' can be customized to change that.
1157 ** New options in `tildify-mode'.
1158 New options `tildify-space-string', `tildify-pattern', and
1159 `tildify-foreach-region-function' variables make
1160 `tildify-string-alist', `tildify-pattern-alist', and
1161 `tildify-ignored-environments-alist' variables (as well as a few
1162 helper functions) obsolete.
1165 ** New package Xref replaces Etags's front-end and UI
1167 The new package Xref provides a generic framework and new commands to
1168 find and move to definitions of functions, macros, data structures
1169 etc., as well as go back to the location where you were before moving
1170 to a definition. It supersedes and obsoletes many Etags commands,
1171 while still using the etags.el code that reads the TAGS tables as one
1174 The command `xref-find-definitions' replaces `find-tag' and provides
1175 an interface to pick one definition among several.
1176 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
1177 `pop-tag-mark', but has a keybinding (`M-,') different from the one
1178 `pop-tag-mark' used.
1180 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
1181 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1182 `xref-find-apropos' replaces `find-tag-regexp'.
1184 As a result of this, the following commands are now obsolete:
1185 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1188 `tags-loop-continue' is not obsolete because it's still useful in
1189 `tags-search' and `tags-query-replace', for which there are no direct
1193 *** Variants of `tags-search' and `tags-query-replace' in Dired were also
1194 replaced by xref-style commands, see the "Dired" section below.
1199 `find-tag-marker-ring-length' is now an obsolete alias for
1200 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1201 alias for a private variable. `xref-push-marker-stack' and
1202 `xref-pop-marker-stack' should be used instead to manipulate the stack
1203 of searches for definitions.
1206 *** `xref-find-definitions' and `describe-function' now display
1207 information about mode local overrides (defined by cedet/mode-local.el
1208 `define-overloadable-function' `define-mode-local-overrides').
1210 The framework's Lisp API is still experimental and can change in major,
1211 backward-incompatible ways.
1214 ** New package Project
1216 The new package Project provides generic infrastructure for dealing
1217 with projects. The main commands included in it are
1218 `project-find-file' and `project-find-regexp'.
1220 The Lisp API of this package is still experimental.
1223 EUDC's LDAP backend has been improved.
1226 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1229 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1230 subprocess instead of on the command line.
1233 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1234 need to configure this manually anymore.
1237 *** The LDAP configuration section of EUDC's manual has been
1240 There have also been customization changes.
1243 *** New custom variable `eudc-server-hotlist' to allow specifying
1244 multiple EUDC servers in init file.
1247 *** Custom variable `eudc-inline-query-format' defaults to completing
1248 on email and firstname instead of surname.
1251 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1252 to avoid interfering with the kill ring.
1255 *** Custom variable `eudc-inline-expansion-format' defaults to
1256 "Firstname Surname <mail-address>".
1259 *** Custom variable `eudc-options-file' defaults to
1260 "~/.emacs.d/eudc-options".
1263 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1264 allow overriding the regular expression that recognizes the ldapsearch
1265 command line's password prompt.
1268 EUDC's BBDB backend now supports BBDB 3.
1271 EUDC's PH backend (eudcb-ph.el) is obsolete.
1276 *** The new built-in command `clear' can scroll window contents out of sight.
1277 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1280 *** New buffer syntax '#<buffer-name>', which is equivalent to
1281 '#<buffer buffer-name>'. This shorthand makes interacting with
1282 buffers from eshell more convenient. Custom variable
1283 `eshell-buffer-shorthand', which has been broken for a while, has been
1287 *** By default, eshell "visual" program buffers (created by
1288 `eshell-visual-commands' and similar custom vars) are no longer killed
1289 when their processes die. This fixes issues with short-lived commands
1290 and makes visual programs more useful in general. For example, if
1291 "git log" is a visual command, it will always show the visual command
1292 buffer, even if the "git log" process dies. For the old behavior,
1293 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1298 *** Support for the Google Chrome web browser.
1301 *** Support for the Conkeror web browser.
1304 *** Support for several ancient browsers is now officially obsolete.
1307 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1308 be added to the archive.
1311 ** Autorevert: dired buffers are also auto-reverted via file
1312 notifications, if Emacs is compiled with file notification support.
1314 ** File Notifications
1317 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1320 *** The new event `stopped' signals, that a file notification watch is
1321 not active any longer.
1324 *** The new function `file-notify-valid-p' checks, whether a file
1325 notification descriptor still corresponds to an activate watch.
1330 *** The command `dired-do-compress' bound to `Z' now can compress
1331 directories and decompress zip files.
1334 *** New command `dired-do-compress-to' bound to `c' can be used to
1335 compress many marked files into a single named archive. The
1336 compression command is determined from the new
1337 `dired-compress-files-alist' variable.
1340 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1341 viewing HTML files and the like.
1343 *** New user interface for the `A' and `Q' commands.
1344 These keys, now bound to `dired-do-find-regexp' and
1345 `dired-do-find-regexp-and-replace', work similarly to `xref-find-apropos'
1346 and `xref-query-replace-in-results': they present the matches
1347 in the `*xref*' buffer and let you move through the matches. No need
1348 to use `tags-loop-continue' to resume the search or replace loop. The
1349 previous commands, `dired-do-search' and
1350 `dired-do-query-replace-regexp', are still available, but not bound to
1351 keys; rebind `A' and `Q' to invoke them if you want the old behavior
1352 back. We intend to obsolete the old commands in a future release.
1354 ** Tabulated List Mode
1357 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1358 call `tabulated-list-init-header', in which case it will have no
1362 *** `tabulated-list-print' takes a second optional argument, update,
1363 which specifies an alternative printing method which is faster when
1364 few or no entries have changed.
1366 ** Obsolete packages
1372 *** landmark.el (moved to elpa.gnu.org)
1375 * New Modes and Packages in Emacs 25.1
1378 ** pinentry.el allows GnuPG passphrase to be prompted through the
1379 minibuffer instead of a graphical dialog, depending on whether the gpg
1380 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1381 is set). This feature requires newer versions of GnuPG (2.1.5 or
1382 later) and Pinentry (0.9.5 or later).
1385 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1386 The main entry points are `cl-defgeneric' and `cl-defmethod'. See the
1387 node "Generic Functions" in the Emacs Lisp manual for more details.
1390 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1391 SCSS (Sassy CSS) files.
1394 ** let-alist is a new macro (and a package) that allows one to easily
1395 let-bind the values stored in an alist.
1398 ** `tildify-mode' allows automatic insertion of hard spaces as one
1399 types the text. Breaking line after a single-character words is
1400 forbidden by Czech and Polish typography (and may be discouraged in
1401 other languages), so `auto-tildify-mode' makes it easier to create
1402 a typographically-correct documents.
1405 ** The `seq' library adds sequence manipulation functions and macros
1406 that complement basic functions provided by subr.el. All functions
1407 are prefixed with `seq-' and work on lists, strings and vectors.
1408 `pcase' accepts a new Upattern `seq'.
1411 ** The `map' library provides map-manipulation functions that work on
1412 alists, hash-table and arrays. All functions are prefixed with
1413 `map-'. `pcase' accepts a new UPattern `map'.
1416 ** The `thunk' library provides functions and macros to control the
1417 evaluation of forms.
1420 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1421 support for JSX, an XML-like syntax extension to ECMAScript.
1424 * Incompatible Lisp Changes in Emacs 25.1
1427 ** `setq' and `setf' must now be called with an even number of
1428 arguments. The earlier behavior of silently supplying a nil to the
1429 last variable when there was an odd number of arguments has been
1433 ** `syntax-begin-function' is declared obsolete.
1434 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1435 slot in font-lock-defaults.
1438 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1439 called during startup. Users who call this function in their init
1440 file and still expect it to be run after startup should set
1441 `package-enable-at-startup' to t after the call to
1442 `package-initialize'.
1445 ** `:global' minor mode use `setq-default' rather than `setq'.
1446 This means that you can't use `make-local-variable' and expect them to
1447 "magically" become buffer-local.
1450 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1451 The `track-mouse' form no longer refrains from changing the shape of
1452 the mouse pointer for the entire time the body of that form is
1453 executed. Lisp programs that use `track-mouse' for dragging across
1454 large portions of the Emacs display, and want to avoid changes in the
1455 pointer shape during dragging, should bind the variable `track-mouse'
1456 to the special value `dragging' in the body of the form.
1459 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1460 has any effect. (This change was made in Emacs 24.4 but was not
1461 advertised at the time.)
1464 ** `indirect-function' does not signal `void-function' any more.
1465 This is mostly a bug-fix, since this change was missed back in 24.4 when
1466 symbol-function was changed not to signal `void-function' any more.
1469 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1472 ** Comint, term, and compile do not set the EMACS env var any more.
1473 Use the INSIDE_EMACS environment variable instead.
1476 ** `save-excursion' does not save&restore the mark any more.
1477 Use `save-mark-and-excursion' if you want the old behavior.
1480 ** `read-buffer' and `read-buffer-function' can now be called with a 4th
1481 argument (`predicate').
1484 ** `completion-table-dynamic' by default stays in the minibuffer.
1485 The minibuffer will be the current buffer when the function is called.
1486 If you want the old behavior of calling the function in the buffer
1487 from which the minibuffer was entered, use the new argument
1488 `switch-buffer' to `completion-table-dynamic'.
1491 ** window-configurations no longer record the buffers' marks.
1494 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1495 active region handling.
1498 ** deactivate-mark is now buffer-local.
1501 ** `cl-the' now asserts that its argument is of the given type.
1504 ** `process-running-child-p' may now return a numeric process
1505 group ID instead of `t'.
1508 ** Mouse click events on mode line or header line no longer include
1509 any reference to a buffer position. The 6th member of the mouse
1510 position list returned for such events is now nil.
1513 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1514 These slots used to hold key-shortcut data, but have been obsolete since
1518 ** Emacs no longer downcases the first letter of a system diagnostic
1519 when signaling a file error. For example, it now reports "Permission
1520 denied" instead of "permission denied". The old behavior was problematic
1521 in languages like German where downcasing rules depend on grammar.
1524 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1525 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1526 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1527 and apostrophe `like this'. The default value nil acts like ‘curve’
1528 if curved single quotes are displayable, and like ‘grave’ otherwise.
1529 The new variable affects display of diagnostics and help, but not of info.
1532 ** substitute-command-keys now replaces quotes.
1533 That is, it converts documentation strings’ quoting style as per the
1534 value of ‘text-quoting-style’. Doc strings in source code can use
1535 either curved single quotes or grave accents and apostrophes. As
1536 before, characters preceded by \= are output as-is.
1539 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1540 They use the new ‘format-message’ function instead of plain ‘format’,
1541 so that they now follow user preference as per ‘text-quoting-style’
1542 when processing curved single quotes, grave accents, and apostrophes
1543 in their format argument.
1546 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1547 now match multibyte characters using Unicode character properties.
1548 If you want the old behavior where they matched any character with
1549 word syntax, use `\sw' instead.
1552 ** The character classes [:graph:] and [:print:] in regular expressions
1553 no longer match every multibyte character. Instead, Emacs now
1554 consults the Unicode character properties to determine which
1555 characters are graphic or printable. In particular, surrogates and
1556 unassigned codepoints are now rejected. If you want the old behavior,
1557 use [:multibyte:] instead.
1560 ** The `diff' command uses the unified format now. To restore the old
1561 behavior, set `diff-switches' to `-c'.
1564 ** `grep-template' and `grep-find-template' values don't include the
1565 --color argument anymore. It's added at the <C> place holder position
1566 dynamically. Any third-party code that changes these templates should
1567 be updated accordingly.
1570 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1571 The new behavior is compatible with Common Lisp and with XEmacs.
1572 This change does not affect Lisp code intended to be portable to
1573 Emacs 24.2 and earlier, which did not support unary ‘/’.
1576 ** The `default-directory' value doesn't have to end slash. To make
1577 that happen, `unhandled-file-name-directory' now defaults to calling
1578 `file-name-as-directory'.
1581 * Lisp Changes in Emacs 25.1
1585 *** New UPatterns `quote', `app'.
1587 *** New UPatterns can be defined with `pcase-defmacro'.
1589 *** New vector QPattern.
1592 ** syntax-propertize is now automatically called on-demand during forward
1593 parsing functions like `forward-sexp'.
1596 ** New hooks `prefix-command-echo-keystrokes-functions' and
1597 `prefix-command-preserve-state-hook' allow the definition of prefix
1598 commands other than the predefined `C-u'.
1601 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1602 These allow conversion between buffer positions and the corresponding
1603 file byte offsets, given the file's encoding.
1606 ** The default value of `load-read-function' is now `read'.
1607 Previously, the default value of `nil' implied using `read'.
1610 ** New hook `pre-redisplay-functions'.
1611 It is a bit easier to use than `pre-redisplay-function'.
1614 ** The second arg of `looking-back' should always be provided explicitly.
1615 Previously, it was an optional argument, now it's mandatory.
1618 ** Text properties `intangible', `point-entered', and `point-left' are obsolete.
1619 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1620 implemented by the new `cursor-intangible-mode' and
1621 `cursor-sensor-mode' minor modes.
1624 ** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
1625 Use the new minor modes `cursor-intangible-mode' and
1626 `cursor-sensor-mode' instead.
1629 ** New process type `pipe', which can be used in combination with the
1630 `:stderr' keyword of make-process to handle standard error output
1634 ** New function `make-process' provides an alternative interface to
1635 `start-process'. It allows programs to set process parameters such as
1636 process filter, sentinel, etc., through keyword arguments (similar to
1637 `make-network-process').
1640 ** A new function `directory-files-recursively' returns all matching
1641 files (recursively) under a directory.
1644 ** New variable `inhibit-message', when bound to non-nil, inhibits
1645 `message' and related functions from displaying messages in the echo
1646 area. The output is still logged to the *Messages* buffer.
1649 ** A new text property `inhibit-read-only' can be used in read-only
1650 buffers to allow certain parts of the text to be writable.
1653 ** A new variable `comment-end-can-be-escaped' is useful in languages
1654 such as C and C++ where line comments with escaped newlines are
1655 continued to the next line.
1658 ** New macro `define-advice'.
1661 ** Emacs Lisp now supports generators.
1662 See the "Generators" section of the ELisp manual for the details.
1665 ** New finalizer facility for running code when objects become unreachable.
1666 See the "Finalizer Type" subsection in the ELisp manual for the
1670 ** lexical closures can use (:documentation FORM) to build their docstring.
1671 It should be placed right where the docstring would be, and FORM is then
1672 evaluated (and should return a string) when the closure is built.
1675 ** define-inline provides a new way to define inlinable functions.
1678 ** New function `macroexpand-1' to perform a single step of macro expansion.
1681 ** Some "x-*" functions were obsoleted and/or renamed:
1682 *** x-select-text is renamed gui-select-text.
1683 *** x-selection-value is renamed gui-selection-value.
1684 *** x-get-selection is renamed gui-get-selection.
1685 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1686 *** x-get-selection-value is renamed to gui-get-primary-selection.
1687 *** x-set-selection is renamed to gui-set-selection
1690 ** New function `string-greaterp', which return the opposite result of
1694 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1695 preserve the collation order as defined by the system's locale(1)
1696 environment. For the time being this is implemented for modern POSIX
1697 systems and for MS-Windows, for other systems they fall back to their
1698 counterparts `string-lessp' and `string-equal'.
1701 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1702 The effect is that, on systems that use ls-lisp for Dired, the default
1703 sort order of the files in Dired is now different from what it was in
1704 previous versions of Emacs. In particular, the file names are sorted
1705 disregarding punctuation, accents, and diacritics, and letter case is
1706 ignored. For example, files whose name begin with a period will no
1707 longer appear near the beginning of the directory listing. If you
1708 want the old, locale-independent sorting, customize the new option
1709 `ls-lisp-use-string-collate' to the nil value.
1712 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1713 if set to a non-nil value, causes the above 2 functions to ignore
1714 symbol and punctuation characters when collating strings. This
1715 emulates the behavior of modern Posix platforms when the locale's
1716 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1717 MS-Windows doesn't support UTF-8 as codeset in its locales.
1720 ** New function `alist-get', which is also a valid place (aka lvalue).
1723 ** New function `funcall-interactively', which works like `funcall'
1724 but makes `called-interactively-p' treat the function as (you guessed it)
1725 called interactively.
1728 ** New function `function-put' to use instead of `put' for function properties.
1731 ** The new function `bidi-find-overridden-directionality' allows you to
1732 find characters whose directionality was, perhaps maliciously,
1733 overridden by directional override control characters. Lisp programs
1734 can use this to detect potential phishing of URLs and other links that
1735 exploits bidirectional display reordering.
1738 ** The new function `buffer-substring-with-bidi-context' allows you to
1739 copy a portion of a buffer into a different location while preserving
1740 the visual appearance both of the copied text and the text at
1741 destination, even when the copied text includes mixed bidirectional
1742 text and directional control characters.
1745 ** New properties that can be specified with `declare':
1746 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1747 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1748 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1752 ** New macro `with-file-modes', for evaluating expressions with default file
1753 permissions set to temporary values (e.g., for creating private files).
1756 ** You can access the slots of structures using `cl-struct-slot-value'.
1759 ** Function `sort' can deal with vectors.
1762 ** Function `system-name' now returns an updated value if the current
1763 system's name has changed or if the Emacs process has changed systems,
1764 and to avoid long waits it no longer consults DNS to canonicalize the
1765 name. The variable `system-name' is now obsolete.
1768 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1771 ** If `pwd' is called with a prefix argument, insert the current default
1775 ** New functions return extended information about fonts and faces.
1778 *** The function `font-info' now returns more details about a font.
1779 In particular, it now returns the average width of the font's
1780 characters, which can be used for geometry-related calculations.
1783 *** A new function `default-font-width' returns the average width of a
1784 character in the current buffer's default font. If the default face
1785 is remapped (see `face-remapping-alist'), the value for the remapped
1786 face is returned. This function complements the existing function
1787 `default-font-height'.
1790 *** New functions `window-font-height' and `window-font-width' return
1791 the height and average width of characters in a specified face and
1792 window. If FACE is remapped (see `face-remapping-alist'), the
1793 function returns the information for the remapped face.
1796 *** A new function `window-max-chars-per-line' returns the maximal
1797 number of characters that can be displayed on one line. If a face
1798 and/or window are provided, these values are used for the
1799 calculation. This function is different from `window-body-width' in
1800 that it accounts for (i) continuation glyphs, (ii) the size of the
1801 font, and (iii) the specified window.
1804 ** New utilities in subr-x.el:
1805 *** New macros `if-let' and `when-let' allow defining bindings and to
1806 execute code depending whether all values are true.
1807 *** New macros `thread-first' and `thread-last' allow threading a form
1808 as the first or last argument of subsequent forms.
1811 ** Documentation strings now support quoting with curved single quotes
1812 ‘like-this’ in addition to the old style with grave accent and
1813 apostrophe `like-this'. The new style looks better on today's displays.
1814 In the new Electric Quote mode, you can enter curved single quotes
1815 into documentation by typing ` and '. Outside Electric Quote mode,
1816 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1817 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1818 ‘text-quoting-style’, the user can specify how to display doc string
1822 ** New function ‘format-message’ is like ‘format’ and also converts
1823 curved single quotes, grave accents and apostrophes as per
1824 ‘text-quoting-style’.
1827 ** show-help-function's arg is converted via substitute-command-keys
1828 before being passed to the function. Help strings, help-echo
1829 properties, etc. can therefore contain command key escapes and
1833 ** Time-related changes:
1835 *** Time conversion functions now accept an optional ZONE argument
1836 that specifies the time zone rules for conversion. ZONE is omitted or
1837 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1838 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1839 rule. The affected functions are ‘current-time-string’,
1840 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1841 function ‘encode-time’, which already accepted a simple time zone rule
1842 argument, has been extended to accept all the new forms.
1844 *** Time-related functions now consistently accept numbers
1845 (representing seconds since the epoch) and nil (representing the
1846 current time) as well as the usual list-of-integer representation.
1847 Affected functions include `current-time-string', `current-time-zone',
1848 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1849 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1850 `time-to-days', and `time-to-seconds'.
1852 *** The `encode-time-value' and `with-decoded-time-value' macros have
1855 *** `calendar-next-time-zone-transition', `time-add', and
1856 `time-subtract' no longer return time values in the obsolete and
1857 undocumented integer-pair format. Instead, they return a list of two
1861 ** New function `set-binary-mode' allows switching a standard stream
1862 of the Emacs process to binary I/O mode.
1865 ** The new function `directory-name-p' can be used to check whether a file
1866 name (as returned from, for instance, `file-name-all-completions') is
1867 a directory file name. It returns non-nil if the last character in
1868 the name is a directory separator character (forward slash on GNU and
1869 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1872 ** ASCII approximations to curved quotes are put in standard-display-table
1873 if the terminal cannot display curved quotes.
1876 ** Standard output and error streams now transliterate characters via
1877 standard-display-table, and encode output using locale-coding-system.
1878 To force a specific encoding, bind `coding-system-for-write' to the
1879 coding-system of your choice when invoking functions like `prin1' and
1883 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1886 ** New possible value for `system-type': `nacl'.
1887 This is used by Google's Native Client (NaCl).
1889 ** Miscellaneous name change
1892 For consistency with the usual Emacs spelling, the Lisp variable
1893 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1894 The old name should still work, as an obsolescent alias.
1896 ** Changes in Frame- and Window- Handling
1899 *** Emacs can now draw horizontal scroll bars on some platforms that
1900 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1901 Horizontal scroll bars are turned off by default.
1903 **** New function `horizontal-scroll-bars-available-p' telling whether
1904 horizontal scroll bars are available on the underlying system.
1906 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1907 bars on all existing and future frames.
1909 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1910 scroll bars on the selected frame.
1912 **** New frame parameters `horizontal-scroll-bars' and
1913 `scroll-bar-height' to set horizontal scroll bars and their height
1914 for individual frames and in `default-frame-alist'.
1916 **** New functions `frame-scroll-bar-height' and
1917 `window-scroll-bar-height' return the height of horizontal scroll
1918 bars on a specific frame or window.
1920 **** `set-window-scroll-bars' now accepts five parameters where the last
1921 two specify height and type of the window's horizontal scroll bar.
1923 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
1926 **** New buffer-local variables `horizontal-scroll-bar' and
1927 `scroll-bar-height'.
1930 *** New functions `frame-geometry' and `frame-edges' give access to a
1934 *** New functions `mouse-absolute-pixel-position' and
1935 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1939 *** The function `window-edges' now accepts three additional arguments to
1940 retrieve body, absolute and pixel edges of the window.
1943 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
1944 `window-inside-absolute-pixel-edges' have been renamed to respectively
1945 `window-body-edges', `window-body-pixel-edges' and
1946 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1949 *** New function `window-absolute-pixel-position' to get the screen
1950 coordinates of a visible buffer position.
1953 *** The height of a frame's menu and tool bar are no longer counted in the
1954 frame's text height. This means that the text height stands only for
1955 the height of the frame's root window plus that of the echo area (if
1956 present). This was already the behavior for frames with external tool
1957 and menu bars (like in the Gtk builds) but has now been extended to all
1961 *** Frames now do not necessarily preserve the number of columns or lines
1962 they display when setting default font, menu bar, fringe width, or
1963 scroll bars. In particular, maximized and fullscreen frames are
1964 conceptually never resized if such settings change. For fullheight and
1965 fullwidth frames, the behavior may depend on the toolkit used.
1966 **** New option `frame-inhibit-implied-resize' if non-nil, means that
1967 setting default font, menu bar, fringe width, or scroll bars of a
1968 specific frame does not resize that frame in order to preserve the
1969 number of columns or lines it displays.
1972 *** New function `window-preserve-size' allows you to preserve the size of
1973 a window without "fixing" it. It's supported by `fit-window-to-buffer',
1974 `temp-buffer-resize-mode' and `display-buffer'.
1977 *** New `display-buffer' action function `display-buffer-use-some-frame'.
1978 This displays the buffer in an existing frame other than the current
1979 frame, and allows the caller to specify a frame predicate to exclude
1983 *** New minor mode `window-divider-mode' and options
1984 `window-divider-default-places', `window-divider-default-bottom-width'
1985 and `window-divider-default-right-width'.
1988 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
1989 Those features have been deprecated in Gtk+ for a long time.
1994 *** etags no longer qualifies class members by default.
1996 By default, `etags' will not qualify class members for C-like
1997 object-oriented languages with their class names and namespaces, and
1998 will remove qualifications used explicitly in the code from the tag
1999 names it puts in TAGS files. This is so the etags.el back-end for
2000 `xref-find-definitions' is more accurate and produces less false
2003 Use --class-qualify (-Q) if you want the old default behavior of
2004 qualifying class members in C++, Java, and Objective C. Note that
2005 using -Q might make some class members become "unknown" to `M-.'
2006 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
2007 qualified names by hand.
2010 *** New language Ruby
2012 Names of modules, classes, methods, functions, and constants are
2013 tagged. Overloaded operators are also tagged.
2017 Names of packages, functions, and types are tagged.
2020 *** Improved support for Lua
2022 Etags now tags functions even if the "function" keyword follows some
2023 whitespace at line beginning.
2026 * Changes in Emacs 25.1 on Non-Free Operating Systems
2029 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2030 This includes the makefile.w32-in files in various subdirectories, and
2031 the support files. The file nt/configure.bat now just tells the user
2032 to use the procedure described in nt/INSTALL, by running the Posix
2033 `configure' script in the top-level directory.
2036 ** Building Emacs for MS-Windows requires at least Windows XP
2037 or Windows Server 2003. The built binaries still run on all versions
2038 of Windows starting with Windows 9X.
2041 ** Emacs running on MS-Windows now supports the daemon mode.
2044 ** The byte counts in etags-generated TAGS files are now the same on
2045 MS-Windows as they are on other platforms.
2048 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2049 Pass '--without-ns' to configure to create an X11 build, the old default.
2052 ** OS X 10.5 or older is no longer supported.
2055 ** OS X on PowerPC is no longer supported.
2058 ** New variable `ns-use-fullscreen-animation' controls animation for
2059 non-native NS fullscreen. The default is nil. Set to t to enable
2060 animation when entering and leaving fullscreen. For native OSX fullscreen
2064 ** The new function 'w32-application-type' returns the type of an
2065 MS-Windows application given the name of its executable program file.
2067 ** New variable `w32-pipe-buffer-size'.
2068 It can be used to tune the size of the buffer of pipes created for
2069 communicating with subprocesses, when the program run by a subprocess
2070 exhibits unusual buffering behavior. Default is zero, which lets the
2071 OS use its default size.
2074 ----------------------------------------------------------------------
2075 This file is part of GNU Emacs.
2077 GNU Emacs is free software: you can redistribute it and/or modify
2078 it under the terms of the GNU General Public License as published by
2079 the Free Software Foundation, either version 3 of the License, or
2080 (at your option) any later version.
2082 GNU Emacs is distributed in the hope that it will be useful,
2083 but WITHOUT ANY WARRANTY; without even the implied warranty of
2084 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2085 GNU General Public License for more details.
2087 You should have received a copy of the GNU General Public License
2088 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2094 paragraph-separate: "[
\f]*$"