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
28 ** The new option 'configure --enable-gcc-warnings=warn-only' causes
29 GCC to issue warnings without stopping the build. This behavior is
30 now the default in developer builds. As before, use
31 '--disable-gcc-warnings' to suppress GCC's warnings, and
32 '--enable-gcc-warnings' to stop the build if GCC issues warnings.
35 ** The Emacs server now has socket-launching support. This allows
36 socket based activation, where an external process like systemd can
37 invoke the Emacs server process upon a socket connection event and
38 hand the socket over to Emacs. Emacs uses this socket to service
39 emacsclient commands. This new functionality can be disabled with the
40 configure option '--disable-libsystemd'.
42 ** New configure option '--disable-build-details' attempts to build an
43 Emacs that is more likely to be reproducible; that is, if you build
44 and install Emacs twice, the second Emacs is a copy of the first.
45 Deterministic builds omit the build date from the output of the
46 emacs-version and erc-cmd-SV functions, and the leave the following
47 variables nil: emacs-build-system, emacs-build-time,
50 ** Emacs no longer works on IRIX. We expect that Emacs users are not
51 affected by this, as SGI stopped supporting IRIX in December 2013.
54 * Startup Changes in Emacs 25.2
57 * Changes in Emacs 25.2
60 ** A number of accessors for the value returned by 'file-attributes'
61 has been added. They are: 'file-attribute-type',
62 'file-attribute-link-number', 'file-attribute-user-id',
63 'file-attribute-group-id', 'file-attribute-access-time',
64 'file-attribute-modification-time',
65 'file-attribute-status-change-time', 'file-attribute-size',
66 'file-attribute-modes', 'file-attribute-inode-number', and
67 'file-attribute-device-number'
70 ** The new function 'buffer-hash' has been added, and can be used to
71 compute a fash, non-consing hash of the contents of a buffer.
74 ** 'fill-paragraph' no longer marks the buffer as changed unless it
75 actually changed something.
78 ** The locale language name 'ca' is now mapped to the language
79 environment 'Catalan', which has been added.
82 ** 'align-regexp' has a separate history for its interactive argument
83 'align-regexp' no longer shares its history with all other
84 history-less functions that use 'read-string'
87 ** The networking code has been reworked so that it's more
88 asynchronous than it was (when specifying :nowait t in
89 'make-network-process'). How asynchronous it is varies based on the
90 capabilities of the system, but on a typical GNU/Linux system the DNS
91 resolution, the connection, and (for TLS streams) the TLS negotiation
92 are all done without blocking the main Emacs thread. To get
93 asynchronous TLS, the TLS boot parameters have to be passed in (see
94 the manual for details).
96 Certain process oriented functions (like 'process-datagram-address')
97 will block until socket setup has been performed. The recommended way
98 to deal with asynchronous sockets is to avoid interacting with them
99 until they have changed status to "run". This is most easily done
100 from a process sentinel.
102 ** 'make-network-process' and 'open-network-stream' sometimes allowed
103 :service to be an integer string (e.g., :service "993") and sometimes
104 required an integer (e.g., :service 993). This difference has been
105 eliminated, and integer strings work everywhere.
107 ** It is possible to disable attempted recovery on fatal signals
109 Two new variables allow to disable attempts to recover from stack
110 overflow and to avoid automatic auto-save when Emacs is delivered a
111 fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
112 will disable attempts to recover from C stack overflows; Emacs will
113 then crash as with any other fatal signal.
114 'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
115 disable attempts to auto-save the session and shut down in an orderly
116 fashion when Emacs receives a fatal signal; instead, Emacs will
117 terminate immediately. Both variables are non-'nil' by default.
118 These variables are for users who would like to avoid the small
119 probability of data corruption due to techniques Emacs uses to recover
123 ** A second dir-local file (.dir-locals-2.el) is now accepted.
124 See the variable 'dir-locals-file-2' for more information.
127 ** International domain names (IDNA) are now encoded via the new
128 puny.el library, so that one can visit web sites with non-ASCII URLs.
131 ** The new 'timer-list' command lists all active timers in a buffer
132 where you can cancel them with the 'c' command.
135 ** New function 'read-multiple-choice' use to prompt for
136 multiple-choice questions, with a handy way to display help texts.
139 * Editing Changes in Emacs 25.2
142 ** New bindings for 'query-replace-map'.
143 'undo', undo the last replacement; bound to 'u'.
144 'undo-all', undo all replacements; bound to 'U'.
147 * Changes in Specialized Modes and Packages in Emacs 25.2
152 *** Messages from CMake are now recognized.
157 *** In wdired, when editing files to contain slash characters,
158 the resulting directories are automatically created. Whether
159 to do this or not is controlled by the
160 'wdired-create-parent-directories' variable.
163 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
164 viewing HTML files and the like.
169 *** A new 's' command for switching to another eww buffer via the minibuffer.
172 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
173 with the 'o' command from 'image-map'.
176 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
177 whether to use the HTML-specified colors or not. The user can also
178 customize the 'shr-use-colors' variable.
181 *** Images that are being loaded are now marked with grey
182 "placeholder" images of the size specified by the HTML. They are then
183 replaced by the real images asynchronously, which will also now
184 respect width/height HTML specs (unless they specify widths/heights
185 bigger than the current window).
190 *** Images are automatically scaled before displaying based on the
191 'image-scaling-factor' variable (if Emacs supports scaling the images
195 *** Images inserted with 'insert-image' and related functions get a
196 keymap put into the text properties (or overlays) that span the
197 image. This keymap binds keystrokes for manipulating size and
198 rotation, as well as saving the image to a file. These commands are
199 also available in 'image-mode'.
202 *** A new library for creating and manipulating SVG images has been
203 added. See the "SVG Images" section in the lispref manual for
207 *** New setf-able function to access and set image parameters is
208 provided: 'image-property'.
211 ** The commands that add ChangeLog entries now prefer a VCS root directory
212 for the ChangeLog file, if none already exists. Customize
213 'change-log-directory-files' to nil for the old behavior.
216 ** Support for non-string values of 'time-stamp-format' has been removed.
221 *** `message-use-idna' now defaults to t (because Emacs comes with
222 built-in IDNA support now).
225 *** The 'message-valid-fqdn-regexp' variable has been removed, since
226 there are now top-level domains added all the time. Message will no
227 longer warn about sending emails to top-level domains it hasn't heard
230 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
231 In 'visual-line-mode' it will look for the true beginning of a header
232 while in non-'visual-line-mode' it will move the point to the indented
238 *** New connection method "sg", which allows to edit files under
242 *** New connection method "doas" for OpenBSD hosts.
245 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
250 *** Support for completing attribute values and bang-rules using the
251 'completion-at-point' command.
254 ** Emacs now supports character name escape sequences in character and
255 string literals. The syntax variants \N{character name} and
256 \N{U+code} are supported.
259 ** Prog mode has some support for multi-mode indentation.
260 This allows better indentation support in modes that support multiple
261 programming languages in the same buffer, like literate programming
262 environments or ANTLR programs with embedded Python code.
264 A major mode can provide indentation context for a sub-mode through
265 the 'prog-indentation-context' variable. To support this, modes that
266 provide indentation should use 'prog-widen' instead of 'widen' and
267 'prog-first-column' instead of a literal zero. See the node
268 "Mode-Specific Indent" in the ELisp manual for more details.
272 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
278 *** The new function 'url-cookie-delete-cookie' can be used to
279 programmatically delete all cookies, or cookies from a specific
282 *** The URL package now support https over proxies supporting CONNECT.
284 ** VC and related modes
287 *** The VC state indicator in the mode line now defaults to more
288 colorful faces to make it more obvious to the user what the state is.
289 See the 'vc-faces' customization group.
292 * New Modes and Packages in Emacs 25.2
295 * Incompatible Lisp Changes in Emacs 25.2
298 ** Resizing a frame no longer runs 'window-configuration-change-hook'.
299 Put your function on 'window-size-change-functions' instead.
301 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
302 mode to send the same escape sequences that xterm does. This makes
303 things like forward-word in readline work.
306 ** hideshow mode got four key bindings that are analogous to outline
307 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
309 ** The grep/rgrep/lgrep functions will now ask about saving files
310 before running. This is controlled by the 'grep-save-buffers'
314 * Lisp Changes in Emacs 25.2
316 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
318 ** Autoload files can be generated without timestamps,
319 by setting 'autoload-timestamps' to nil.
320 FIXME As an experiment, nil is the current default.
321 If no insurmountable problems before next release, it can stay that way.
323 ** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
327 ** 'gnutls-boot' now takes a parameter :complete-negotiation that says
328 that negotiation should complete even on non-blocking sockets.
331 ** New functions 'window-pixel-width-before-size-change' and
332 'window-pixel-height-before-size-change' allow to detect which window
333 changed size when 'window-size-change-functions' are run.
336 ** New function 'display-buffer-reuse-mode-window' is an action function
337 suitable for use in 'display-buffer-alist'. For example, to avoid creating
338 a new window when opening man pages when there's already one, use
339 (add-to-list 'display-buffer-alist
340 '("\\`\\*Man .*\\*\\'" .
341 (display-buffer-reuse-mode-window
342 (inhibit-same-window . nil)
346 ** There is now a new variable 'flyspell-sort-corrections-function'
347 that allows changing the way corrections are sorted.
350 ** The new command 'fortune-message' has been added, which displays
351 fortunes in the echo area.
354 ** New function 'func-arity' returns information about the argument list
355 of an arbitrary function.
356 This is a generalization of 'subr-arity' for functions that are not
357 built-in primitives. We recommend using this new function instead of
361 ** 'parse-partial-sexp' state has a new element. Element 10 is
362 non-nil when the last character scanned might be the first character
363 of a two character construct, i.e. a comment delimiter or escaped
364 character. Its value is the syntax of that last character.
367 ** 'parse-partial-sexp''s state, element 9, has now been confirmed as
368 permanent and documented, and may be used by Lisp programs. Its value
369 is a list of currently open parenthesis positions, starting with the
370 outermost parenthesis.
373 ** 'read-color' will now display the color names using the color itself
374 as the background color.
376 ** The function 'redirect-debugging-output' now works on platforms
377 other than GNU/Linux.
380 ** The new function 'string-version-lessp' compares strings by
381 interpreting consecutive runs of numerical characters as numbers, and
382 compares their numerical values. According to this predicate,
383 "foo2.png" is smaller than "foo12.png".
386 ** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
387 Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
388 two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
389 ('sxhash-eql') on them will be the same.
392 ** Function 'sxhash' has been renamed to 'sxhash-equal' for
393 consistency with the new functions. For compatibility, 'sxhash'
394 remains as an alias to 'sxhash-equal'.
397 ** Time conversion functions that accept a time zone rule argument now
398 allow it to be OFFSET or a list (OFFSET ABBR), where the integer
399 OFFSET is a count of seconds east of Universal Time, and the string
400 ABBR is a time zone abbreviation. The affected functions are
401 'current-time-string', 'current-time-zone', 'decode-time',
402 'format-time-string', and 'set-time-zone-rule'.
405 * Changes in Emacs 25.2 on Non-Free Operating Systems
407 ** Intercepting hotkeys on Windows 7 and later now works better.
408 The new keyboard hooking code properly grabs system hotkeys such as
409 Win-* and Alt-TAB, in a way that Emacs can get at them before the
410 system. This makes the 'w32-register-hot-key' functionality work
411 again on all versions of MS-Windows starting with Windows 7. On
412 Windows NT and later you can now register any hotkey combination. (On
413 Windows 9X, the previous limitations, spelled out in the Emacs manual,
417 * Installation Changes in Emacs 25.1
420 ** Building Emacs now requires C99 or later.
423 ** Building Emacs now requires GNU make, version 3.81 or later.
426 ** New configure option --with-cairo.
427 This builds Emacs with Cairo drawing. As a side effect, it provides
428 support for built-in printing, when Emacs was built with GTK+.
429 Cairo drawing is an experimental feature in Emacs, and subject to
430 change in future releases.
433 ** New configure option --with-modules.
434 This enables support for loading dynamic modules; see below.
437 ** By default, Emacs no longer works on IRIX. We expect that Emacs
438 users are not affected by this, as SGI stopped supporting IRIX in
439 December 2013. If you are affected, please send a bug report. You
440 should be able to work around the problem either by porting the Emacs
441 undumping code to GCC under IRIX, or by configuring --with-wide-int,
442 or by sticking with Emacs 24.4.
445 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
446 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
447 since Emacs 24.4, and the other variants were undocumented and were
448 obstacles to maintenance and development. GC_MARK_STACK and its
449 related symbols have been removed from the C internals.
452 ** 'configure' now prefers gnustep-config when configuring GNUstep.
453 If gnustep-config is not available, the old heuristics are used.
456 ** 'configure' now prefers inotify to gfile for file notification,
457 unless gfile is explicitly requested via --with-file-notification='gfile'.
460 ** 'configure' detects the kqueue file notification library on *BSD
461 and Mac OS X machines.
464 ** The configure option '--with-pkg-config-prog' has been removed.
465 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
468 ** The configure option '--with-mmdf' has been removed.
469 It was no longer useful, as it relied on libraries that are no longer
470 supported, and its presence led to confusion during configuration.
471 This affects only the 'movemail' utility; Emacs itself can still
472 process MMDF-format files as before.
475 ** The configure option '--enable-silent-rules' is now the default,
476 and silent rules are now quieter. To get the old behavior where
477 'make' chatters a lot, configure with '--disable-silent-rules' or
478 build with 'make V=1'.
481 ** The configure option '--with-gameuser' now allows you to specify a
482 group instead of a user if its argument is prefixed by ':' (a colon).
483 This will cause the game score files in ${localstatedir}/games/emacs
484 to be owned by that group, and the helper program for updating them to
485 be installed setgid. The option now defaults to the 'games' group.
488 ** The 'grep-changelog' script (and its manual page) are no longer included.
489 It has no particular connection to Emacs and has not changed in years,
490 so if you want to use it, you can always take a copy from an older Emacs.
493 ** Emacs 25 comes with a new set of icons.
494 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
495 The old Emacs logo icons are available as 'emacs23.png' in the same location.
498 ** New make target 'check-expensive' to run additional tests.
499 This includes all tests which run via "make check", plus additional
500 tests which take more time to perform.
503 * Startup Changes in Emacs 25.1
506 ** When Emacs is given a file as a command line argument and
507 'initial-buffer-choice' is non-nil, display both the file and
508 'initial-buffer-choice'. When Emacs is given more than one file and
509 'initial-buffer-choice' is non-nil, show 'initial-buffer-choice'
510 and *Buffer List*. This makes Emacs convenient to use from the
511 command line when 'initial-buffer-choice' is non-nil.
514 ** The value of 'initial-scratch-message' is now treated as a doc string
515 and can contain escape sequences for command keys, quotes, and the like.
518 ** The default height of GUI frames was enlarged.
519 This is so there's enough space in the initial window to display the
520 optional text about recovering crashes sessions, without losing the
521 splash image display.
524 * Changes in Emacs 25.1
527 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
528 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
529 xwidget support, you can access the embedded webkit browser with 'M-x
530 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
531 browser. The buffer will have a new mode, 'xwidget-webkit-mode'
532 (similar to 'image-mode'), which supports the webkit widget.
535 *** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
536 'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
537 'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
538 'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
539 'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
540 'xwidget-webkit-scroll-up'.
543 ** Emacs can now load shared/dynamic libraries (modules).
544 A dynamic Emacs module is a shared library that provides additional
545 functionality for use in Emacs Lisp programs, just like a package
546 written in Emacs Lisp would. The functions 'load', 'require',
547 'load-file', etc. were extended to load such modules, as they do with
548 Emacs Lisp packages. The new variable 'module-file-suffix' holds the
549 system-dependent value of the file-name extension ('.so' on Posix
550 hosts) of the module files.
552 A module should export a C-callable function named
553 'emacs_module_init', which Emacs will call as part of the call to
554 'load' or 'require' which loads the module. It should also export a
555 symbol named 'plugin_is_GPL_compatible' to indicate that its code is
556 released under the GPL or compatible license; Emacs will refuse to
557 load modules that don't export such a symbol.
559 If a module needs to call Emacs functions, it should do so through the
560 API defined and documented in the header file 'emacs-module.h'. Note
561 that any module that provides Lisp-callable functions will have to use
562 Emacs functions such as 'fset' and 'funcall', in order to register its
563 functions with the Emacs Lisp interpreter.
565 Modules can create 'user-ptr' Lisp objects that embed pointers to C
566 structs defined by the module. This is useful for keeping around
567 complex data structures created by a module, to be passed back to the
568 module's functions. User-ptr objects can also have associated
569 "finalizers" -- functions to be run when the object is GC'ed; this is
570 useful for freeing any resources allocated for the underlying data
571 structure, such as memory, open file descriptors, etc. A new
572 predicate 'user-ptrp' returns non-nil if its argument is a 'user-ptr'
575 Loadable modules in Emacs are an experimental feature, and subject to
576 change in future releases. For that reason, their support is disabled
577 by default, and must be enabled by using the '--with-modules' option
581 ** Network security (TLS/SSL certificate validity and the like) is
582 added via the new Network Security Manager (NSM) and controlled via
583 the 'network-security-level' variable.
586 ** C-h l now also lists the commands that were run.
589 ** x-select-enable-clipboard is renamed select-enable-clipboard
590 and x-select-enable-primary is renamed select-enable-primary.
591 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
592 name it), with the proviso that on some systems (e.g. Windows)
593 select-enable-primary is ineffective since the system doesn't
594 have the equivalent of a primary selection.
597 ** New option 'switch-to-buffer-in-dedicated-window' allows you to
598 customize how 'switch-to-buffer' proceeds interactively when the
599 selected window is strongly dedicated to its buffer.
602 ** The option 'even-window-heights' has been renamed to
603 'even-window-sizes' and now handles window widths as well.
606 ** terpri gets an optional arg ENSURE to conditionally output a newline.
609 ** 'insert-register' now leaves point after the inserted text
610 when called interactively. A prefix argument toggles this behavior.
613 ** The new variable 'term-file-aliases' replaces some files from lisp/term.
614 The function 'tty-run-terminal-initialization' consults this variable
615 when deciding what terminal-specific initialization code to run.
618 ** New variable 'system-configuration-features', listing some of the
619 main features that Emacs was compiled with. This is mainly intended
620 for use in Emacs bug reports.
623 ** A password is now hidden also when typed in batch mode. Another
624 hiding character but the default '.' can be used by let-binding the
625 variable 'read-hide-char'.
628 ** The Emacs pseudo-random number generator can be securely seeded.
629 On system where Emacs can access the system entropy or some other
630 cryptographically secure random stream, it now uses that when 'random'
631 is called with its argument 't'. This allows cryptographically strong
632 random values; in particular, the Emacs server now uses this facility
633 to produce its authentication key.
636 ** New input methods: 'tamil-dvorak' and 'programmer-dvorak'.
639 * Editing Changes in Emacs 25.1
642 ** M-x suggests shorthands and ignores obsolete commands for completion.
647 *** Successive single-char deletions are collapsed in the undo-log just like
648 successive char insertions. Which commands invoke this behavior is
649 controlled by the new 'undo-auto-amalgamate' function. See the node
650 "Undo" in the ELisp manual for more details.
653 *** The heuristic used to insert 'undo-boundary' after each command
654 has changed, so that if a command causes changes in more than just the
655 current buffer, Emacs now calls 'undo-boundary' in every buffer
656 affected by the command.
659 ** New command 'comment-line' bound to 'C-x C-;'.
661 ** New and improved facilities for inserting Unicode characters
664 *** Unicode names entered via C-x 8 RET now use substring completion by default.
667 *** C-x 8 now has shorthands for several chars, such as U+2010
668 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH). As
669 before, you can type C-x 8 C-h to list shorthands.
672 *** New minor mode electric-quote-mode for using curved quotes as you
673 type. See also the new variable 'text-quoting-style'.
676 ** New minor mode global-eldoc-mode is enabled by default.
679 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
680 Bracketed paste mode causes text terminals to wrap pasted text in special
681 escape sequences that allow Emacs to tell the difference between text
682 you type and text you paste from other applications. Emacs then
683 avoids interpreting each character in the pasted text as it does with
684 keyboard input, which results in a paste experience similar to that
685 under a window system, and significant performance improvements when
686 pasting large amounts of text.
688 Bracketed paste mode is disabled by default, so Emacs automatically
689 enables it at startup if the terminal supports it.
692 ** Emacs now supports the latest version of the UBA.
693 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
694 was updated to support all the latest additions and changes introduced
695 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
696 This includes full support for directional isolates and the
697 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
701 ** You can access 'mouse-buffer-menu' (C-down-mouse-1) using C-f10.
704 ** New buffer-local 'electric-pair-local-mode'.
707 ** New variable 'fast-but-imprecise-scrolling' inhibits
708 fontification during full screen scrolling operations, giving less
709 hesitant operation during auto-repeat of C-v, M-v at the cost of
710 possible inaccuracies in the end position.
713 ** New documentation command 'describe-symbol'.
714 Works for functions, variables, faces, etc. It is bound to 'C-h o' by
718 ** New function 'custom-prompt-customize-unsaved-options' checks for
719 unsaved customizations and prompts user to customize (if found). It
720 is intended for adding to 'kill-emacs-query-functions'.
723 ** The old 'C-x w' bindings in hi-lock-mode are officially deprecated
724 in favor of the global 'M-s h' bindings introduced in Emacs-23.1.
725 They'll disappear soon.
728 * Changes in Specialized Modes and Packages in Emacs 25.1
733 *** New command 'checkdoc-package-keywords' checks if the
734 current package keywords are recognized. Set the new option
735 'checkdoc-package-keywords-flag' to non-nil to make
736 'checkdoc-current-buffer' call this function automatically.
739 *** New function 'checkdoc-file' checks for style errors.
740 It's meant for use together with 'compile':
741 emacs -batch --eval "(checkdoc-file \"subr.el\")"
746 *** The desktop format version has been upgraded from 206 to 208.
747 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
748 cannot read a version 208 desktop. To upgrade your desktop file, you
749 must explicitly request the upgrade, by C-u M-x desktop-save. You are
750 recommended to do this as soon as you have firmly upgraded to Emacs
751 25.1 (or later). Should you ever need to downgrade your desktop file
752 to version 206, you can do this with C-u C-u M-x desktop-save.
755 ** New function 'bookmark-set-no-overwrite' bound to C-x r M.
756 It raises an error if a bookmark of that name already exists,
757 unlike 'bookmark-set' which silently updates an existing bookmark.
762 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
763 now control how mm-* functions fetch and display images in an HTML
764 message. Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
765 for that purpose, i.e., binds mm-html- variables with those gnus-
766 variables, but other packages do not have to bind gnus- variables now.
769 *** 'mm-inline-text-html-with-images' has been removed.
770 Use 'mm-html-inhibit-images' instead. Note that the value is opposite
776 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
777 GnuTLS encryption functions if possible.
782 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
783 the ordering of object keys by default.
786 *** New commands 'json-pretty-print-ordered' and
787 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
788 object keys sorted alphabetically.
790 ** Prettify Symbols mode
793 *** Prettify Symbols mode supports custom composition predicates. By
794 overriding the default 'prettify-symbols-compose-predicate', modes can
795 specify in which contexts a symbol may be displayed as some Unicode
796 character. 'prettify-symbols-default-compose-p' is the default which
797 is suitable for most programming languages such as C or Lisp (but not
801 *** Symbols can be unprettified while point is inside them.
802 New variable 'prettify-symbols-unprettify-at-point' configures this.
804 ** Enhanced xterm support
807 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
808 This variable tells Emacs which advanced capabilities are available in
809 the xterm terminal emulator used to display Emacs text-mode frames.
810 The default is to check each capability, and use it if available.
811 (This variable was introduced in Emacs 24.1, but was not announced in
815 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
816 in the surrounding GUI (using the OSC-52 escape sequence). This only works
817 if your xterm supports it and enables the 'allowWindowOps' options (disabled
818 by default at least in Debian, for security reasons).
820 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
821 escape sequence) if your xterm has the feature enabled but for that you
822 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
825 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
828 ** The way to turn on and off 'save-place' mode has changed.
829 It is no longer sufficient to load the saveplace library and set
830 'save-place' non-nil. Instead, use the two new minor modes:
831 'save-place-mode' turns on saving last place in every file, and
832 'save-place-local-mode' does that only for the file in whose buffer it
833 is invoked. The 'save-place' variable is now an obsolete alias for
834 'save-place-mode', which replaces it, and 'toggle-save-place' is an
835 obsolete alias for the new 'save-place-local-mode' command.
840 *** ERC can now hide message types by network or channel.
841 'erc-hide-list' will hide all messages of the specified type, while
842 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
843 specified message types for the respective specified targets.
846 *** Reconnection is now asynchronous.
849 *** Nick completion is now case-insensitive again after inadvertently
850 being made case-sensitive in Emacs 24.2.
855 *** New commands, key binds, and menu items.
857 **** '<' and '>' for navigating previous and next tracks in playlist
859 **** New play/pause command 'mpc-toggle-play' bound to 's'
861 **** 'g' bound to new command 'mpc-seek-current' will navigate current
864 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
865 toggling playback modes.
868 *** Now supports connecting to a UNIX domain socket.
871 *** Looks at more image file names to use as album art.
872 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
873 (XP) in addition to cover.jpg.
876 *** Searches in more locations for MPD configuration files.
877 MPD supports the XDG base directory specification since version 0.17.6.
882 *** 'midnight-mode' is now a proper minor mode.
885 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
890 *** New "external" package status.
891 An external package is any installed package that's not built-in and
892 not from 'package-user-dir', which usually means it's from an entry in
893 'package-directory-list'. They are treated much like built-in
894 packages, in that they cannot be deleted through the package menu and
895 are not considered for upgrades.
897 The effect is that a user can manually place a specific version of a
898 package inside 'package-directory-list' and the package menu will
902 *** If a package is available on multiple archives and one has higher
903 priority (as per 'package-archive-priorities') only that one is
904 listed. This can be configured with 'package-menu-hide-low-priority'.
907 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
908 This includes the above-mentioned low-priority packages, as well as
909 available packages whose version is lower than the currently installed
910 version (which were previously impossible to display).
911 This allows users to downgrade a package if a lower version is
915 *** When filtering the package menu, keywords starting with "arc:" or
916 "status:" represent package archive or status, respectively, instead
920 *** Most functions which involve downloading information now take an
921 ASYNC argument. If it is non-nil, package.el performs the download(s)
925 *** New variable 'package-menu-async' controls whether the
926 package-menu uses asynchronous downloads.
929 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
930 This follows the same rules as installing from a .tar file, except the
931 -pkg file is optional.
934 *** Packages which are dependencies of other packages cannot be deleted.
935 The FORCE argument to 'package-delete' overrides this.
938 *** New custom variable 'package-selected-packages' tracks packages
939 which were installed by the user (as opposed to installed as
940 dependencies). This variable can also be manually customized.
943 *** New command 'package-install-selected-packages' installs all
944 packages from 'package-selected-packages' which are currently missing.
947 *** 'package-install' function now takes a DONT-SELECT argument. If
948 this function is called interactively or if DONT-SELECT is nil, add the
949 package being installed to 'package-selected-packages'.
952 *** New command 'package-autoremove' removes all packages which were
953 installed strictly as dependencies but are no longer needed.
958 When you invoke 'shell' interactively, the *shell* buffer will now
959 display in a new window. However, you can customize this behavior via
960 the 'display-buffer-alist' variable. For example, to get
961 the old behavior -- *shell* buffer displays in current window -- use
962 (add-to-list 'display-buffer-alist
963 '("^\\*shell\\*$" . (display-buffer-same-window))).
967 *** The ':protection' slot option is not obeyed any more.
969 *** The 'newname' argument to constructors is optional&deprecated.
970 If you need your objects to be named, do it by inheriting from 'eieio-named'.
972 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
974 *** The <class> variables are declared obsolete.
976 *** The <initarg> variables are declared obsolete.
978 *** defgeneric and defmethod are declared obsolete.
979 Use the equivalent facilities from cl-generic.el instead.
981 *** 'constructor' is now an obsolete alias for 'make-instance'.
982 --- 'pcase' accepts a new UPattern 'eieio'.
987 *** New command 'ido-bury-buffer-at-head' bound to C-S-b
988 Bury the buffer at the head of 'ido-matches', analogous to how C-k
989 kills the buffer at head.
992 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
993 meaning, and the list is restricted to those elements that do not
994 match the current input.
999 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
1000 The new commands 'next-line-or-history-element' and
1001 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
1002 minibuffer, allow by-line movement through minibuffer history,
1003 similarly to an ordinary buffer. Only when point moves over
1004 the bottom/top of the minibuffer it goes to the next/previous history
1005 element. 'M-p' and 'M-n' still move directly to previous/next history
1008 ** Search and Replace
1011 *** 'isearch' and 'query-replace' can now perform character folding in matches.
1012 This is analogous to case folding, but instead of disregarding case
1013 variants, it disregards wider classes of distinctions between similar
1014 characters. (Case folding is a special case of character folding.)
1015 This means many characters in the search string will match entire
1016 groups of characters instead of just themselves.
1018 For instance, the ASCII double quote character " will match all
1019 variants of double quotes, and the letter 'a' will match all of its
1020 accented cousins, even those composed of multiple characters, as well
1021 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
1024 Character folding is enabled by customizing 'search-default-mode' to
1025 the value 'character-fold-to-regexp'. You can also toggle character
1026 folding in the middle of a search by typing 'M-s ''.
1028 'query-replace' honors character folding if the new variable
1029 'replace-character-fold' is customized to a non-nil value.
1032 *** New user option 'search-default-mode'.
1033 This option specifies the default mode for Isearch. The default
1034 value, nil specifies that Isearch does literal searches (however,
1035 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
1036 as in previous Emacs versions).
1039 *** New function 'character-fold-to-regexp' can be used
1040 by searching commands to produce a regexp matching anything that
1041 character-folds into STRING.
1044 *** The new M-s M-w key binding uses eww to search the web for the
1045 text in the region. The search engine to use for this is specified by
1046 the customizable variable 'eww-search-prefix'.
1049 *** Query-replace history is enhanced.
1050 When query-replace reads the FROM string from the minibuffer, typing
1051 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
1052 and TO are the original text and its replacement, and SEP is an arrow
1053 string defined by the new variable 'query-replace-from-to-separator'.
1054 To select a prior replacement, type 'M-p' until the desired
1055 replacement appears in the minibuffer, and then exit the minibuffer by
1060 *** If 'quick-calc' is called with a prefix argument, insert the
1061 result of the calculation into the current buffer.
1064 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
1065 this you can tell Edebug not to stop at the start of the first
1066 instrumented function.
1071 *** New minor mode 'global-eldoc-mode'
1072 It is turned on by default, and affects '*scratch*' and other buffers
1073 whose major mode supports Emacs Lisp.
1076 *** 'eldoc-documentation-function' now defaults to 'ignore'
1079 *** 'describe-char-eldoc' displays information about character at point,
1080 and can be used as a default value of 'eldoc-documentation-function'. It is
1081 useful when, for example, one needs to distinguish various spaces - e.g.,
1082 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
1083 using mono-spaced font.
1088 *** HTML can now be rendered using variable-width fonts.
1091 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
1092 whether to use variable-pitch fonts or not. The user can also
1093 customize the 'shr-use-fonts' variable.
1096 *** A new command 'R' ('eww-readable') will try do identify the main
1097 textual parts of a web page and display only that, leaving menus and
1098 the like off the page.
1101 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
1102 toggle the paragraph direction between left-to-right and right-to-left.
1105 *** You can now use several eww buffers in parallel by renaming eww
1106 buffers you want to keep separate.
1109 *** Partial state of the eww buffers (the URIs and the titles of the
1110 pages visited) is now preserved in the desktop file.
1113 *** 'eww-after-render-hook' is now called after eww has rendered
1114 the data in the buffer.
1117 *** The 'eww-reload' command now takes a prefix to not reload via
1118 the net, but just use the local copy of the HTML.
1121 *** The DOM shr and eww uses has been changed to the general Emacs
1122 xml.el/libxml2 DOM, and a new package dom.el has been added to
1123 interact with this DOM. See the Emacs Lisp manual for interface
1127 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
1130 *** The new 'S' command will list all eww buffers, and allow managing
1134 *** https pages with valid certificates have headers marked in green, while
1135 invalid certificates are marked in red.
1140 *** text/html messages that contain inline image parts will be
1141 transformed into multipart/related messages before sending.
1144 ** In Show Paren Mode, a parenthesis can be highlighted when point
1145 stands inside it, and certain parens can be highlighted when point is
1146 at BOL or EOL, or in whitespace there. To enable these, customize,
1147 respectively, 'show-paren-when-point-inside-paren' or
1148 'show-paren-when-point-in-periphery'.
1151 ** If gpg2 exists on the system, it is now used as the default value
1152 of 'epg-gpg-program' (instead of gpg).
1157 *** Strings after ':documentation' are highlighted as docstrings.
1158 This enhances Lisp mode fontification to handle documentation of the
1159 form '(:documentation "the doc string")' used in Common Lisp code for
1160 CLOS class and slot documentation.
1162 ** Rectangle editing
1165 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
1168 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
1169 *** 'string-rectangle' provides on-the-fly preview of the result.
1172 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
1173 These should be used in preference to 'font-lock-fontify-buffer' when
1177 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
1178 to 'minibuffer-setup-hook'.
1180 If the first argument of the macro is of the form '(:append FUN)',
1181 then FUN will be appended to 'minibuffer-setup-hook', instead of
1186 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
1189 *** 'pcase' accepts the new UPattern 'cl-struct'.
1191 ** Calendar and diary
1194 *** The default 'diary-file' is now located in .emacs.d.
1197 *** New commands to insert diary entries with Chinese dates:
1198 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
1199 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
1202 *** The calendar can now list and mark diary entries with Chinese dates.
1203 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
1206 *** The option 'calendar-mode-line-format' can now be nil,
1207 which means to do nothing special with the mode line in calendars.
1210 *** New option 'calendar-weekend-days'.
1211 The option customizes which day headers receive the
1212 'calendar-weekend-header' face.
1215 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
1218 *** Many items obsolete since at least version 23.1 have been removed.
1219 The majority were function/variable/face aliases, too numerous to list here.
1222 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
1223 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
1225 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
1227 **** Macro 'calendar-for-loop'.
1229 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
1231 **** The nil and list forms of 'diary-display-function'.
1234 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
1235 If the output of ERT tests in batch mode execution can be saved to a
1236 log file, then it can be passed as an argument to the above function
1237 to produce a neat summary.
1240 ** New js.el option 'js-indent-first-init'.
1245 ** Info mode now displays symbol names in fixed-pitch font.
1246 If you want to get the old behavior back, customize the 'Info-quoted'
1247 face to use the same definitions as the default face.
1250 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
1253 *** 'info-display-manual' can now be given a prefix argument which (any
1254 non-nil value) directs the command to limit the completion
1255 alternatives to currently visited manuals.
1258 ** ntlm.el has support for NTLM2.
1263 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
1264 to delete or undelete multiple messages.
1267 *** Rmail can now render HTML mail messages if your Emacs was built with
1268 libxml2 or if you have the Lynx browser installed. By default, Rmail
1269 will display the HTML version of a mail message that has both HTML and
1270 plain text parts, if display of HTML email is possible; customize the
1271 'rmail-mime-prefer-html' option to 'nil' if you don't want that.
1274 *** In the commands that make summaries by subject, recipients, or senders,
1275 you can no longer use commas to separate regular expressions.
1278 ** SES now supports local printer functions; see 'ses-define-local-printer'.
1280 ** Shell-script Mode
1282 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
1283 specify the type of shell in use (bash, csh, etc).
1286 *** New value 'always' for 'sh-indent-after-continuation'.
1287 This provides old-style ("dumb") indentation of continued lines.
1288 See the doc string of 'sh-indent-after-continuation' for details.
1292 *** Fatal TLS errors are now silent by default.
1295 *** If Emacs isn't built with TLS support, an external TLS-capable
1296 program is used instead. This program used to be run in --insecure
1297 mode by default, but has now changed to be secure instead, and will
1298 fail if you try to connect to non-verifiable hosts. This is
1299 controlled by the 'tls-program' variable.
1304 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1305 When 'url-handler-mode' is enabled, file operations for these
1306 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1309 *** The URL package allows customizing the 'url-user-agent' string.
1310 The new 'url-user-agent' variable can be customized to be a string or
1314 *** The new interface variable 'url-request-noninteractive' can be used
1315 to specify that we're running in a noninteractive context, and that
1316 we should not be queried about things like TLS certificate validity.
1319 *** 'url-mime-accept-string' can now be used as in "interface"
1320 variable, meaning you can bind it around an 'url-retrieve' call.
1323 *** If URL is used with a https connection, the first callback argument
1324 plist will contain a :peer element that has the output of
1325 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
1330 *** New connection method "afp", which allows you to access Mac OS X
1331 volumes via the Apple Filing Protocol.
1334 *** New connection method "nc", which allows you to access dumb
1338 *** Method-specific parameters can be overwritten now with variable
1339 'tramp-connection-properties'.
1342 *** Handler for 'file-notify-valid-p' for remote machines that support
1343 filesystem notifications.
1348 *** New user variable 'sql-default-directory' enables remote
1349 connections using Tramp.
1352 *** New command 'sql-send-line-and-next'.
1353 This command, bound to 'C-c C-n' by default, sends the current line to
1354 the SQL process and advances to the next line, skipping whitespace and
1358 *** Added support for Vertica SQL.
1360 ** VC and related modes
1363 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
1364 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1365 (undocumented) command vc-hg-push now behaves slightly differently.
1368 *** The new command vc-region-history shows the log+diff of the active region.
1371 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
1372 This command is useful when you perform version control commands
1373 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1374 back-end for the buffer's file, or remove it from version control.
1377 *** New option 'vc-annotate-background-mode' controls whether
1378 the color range from 'vc-annotate-color-map' is applied to the
1379 background or to the foreground.
1382 *** New options for customizing encoding of Git commit log messages.
1383 The new options `vc-git-commits-coding-system' and
1384 `vc-git-log-output-coding-system' allow to customize the encoding of
1385 the log messages sent to Git when committing, and the decoding of the
1386 log messages read from Git history commands. Both default to UTF-8;
1387 if you customize them, make sure they are consistent with the Git
1388 config variables i18n.commitEncoding and i18n.logOutputEncoding.
1389 (`vc-git-commits-coding-system' existed previously, but was a
1390 variable, not a user option.)
1393 *** 'compare-windows' now compares text with the most recently selected window
1394 instead of the next window. If you want the previous behavior of
1395 comparing with the next window, customize the new option
1396 'compare-windows-get-window-function' to the value
1397 'compare-windows-get-next-window'.
1400 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
1401 replace the face 'compare-windows', which is now an obsolete alias for
1402 'compare-windows-added'.
1405 *** The VC state indicator in the mode line now has different faces
1406 corresponding to each of the possible states. See the 'vc-faces'
1407 customization group.
1410 *** 'log-edit-insert-changelog' converts "(tiny change)" to
1411 "Copyright-paperwork-exempt: yes". Set 'log-edit-rewrite-tiny-change'
1412 nil to disable this.
1415 ** VHDL mode now supports VHDL'08.
1420 *** Decimal display mode uses "," groups, so it's more
1421 fitting for use in money calculations
1424 *** Factorial works with non-integer inputs.
1429 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1430 macro argument expansion, interactive macro evaluation and automatic
1431 scanning of #define'd symbols.
1434 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
1435 result of evaluating a macro.
1438 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
1439 all defined symbols in 'hide-ifdef-env'.
1442 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
1443 file name patterns. Defaults to files whose extension is one of '.h',
1444 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
1447 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
1448 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1449 (This could happen when an idempotent header file is visited again,
1450 when its guard symbol is already defined.) Defaults to 't'.
1453 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
1454 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1455 looking for macro definitions. By default, no symbols are ignored.
1460 *** New custom variable 'tex-print-file-extension' to help users who
1461 use PDF instead of DVI.
1464 *** TeX mode now supports Prettify Symbols mode. When enabling
1465 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1466 many other math macros are displayed using unicode characters.
1469 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
1470 By default, 32 consecutive spaces or four consecutive TABs are
1471 considered to be too deep, but the new variable
1472 'whitespace-big-indent-regexp' can be customized to change that.
1475 ** New options in 'tildify-mode'.
1476 New options 'tildify-space-string', 'tildify-pattern', and
1477 'tildify-foreach-region-function' variables make
1478 'tildify-string-alist', 'tildify-pattern-alist', and
1479 'tildify-ignored-environments-alist' variables (as well as a few
1480 helper functions) obsolete.
1483 ** New package Xref replaces Etags's front-end and UI
1485 The new package Xref provides a generic framework and new commands to
1486 find and move to definitions of functions, macros, data structures
1487 etc., as well as go back to the location where you were before moving
1488 to a definition. It supersedes and obsoletes many Etags commands,
1489 while still using the etags.el code that reads the TAGS tables as one
1492 The command 'xref-find-definitions' replaces 'find-tag' and provides
1493 an interface to pick one definition among several.
1494 'tags-loop-continue' is now unbound. 'xref-pop-marker-stack' replaces
1495 'pop-tag-mark', but has a keybinding ('M-,') different from the one
1496 'pop-tag-mark' used.
1498 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
1499 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
1500 'xref-find-apropos' replaces 'find-tag-regexp'.
1502 As a result of this, the following commands are now obsolete:
1503 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
1506 'tags-loop-continue' is not obsolete because it's still useful in
1507 'tags-search' and 'tags-query-replace', for which there are no direct
1511 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
1512 replaced by xref-style commands, see the "Dired" section below.
1517 'find-tag-marker-ring-length' is now an obsolete alias for
1518 'xref-marker-ring-length'. 'find-tag-marker-ring' is now an obsolete
1519 alias for a private variable. 'xref-push-marker-stack' and
1520 'xref-pop-marker-stack' should be used instead to manipulate the stack
1521 of searches for definitions.
1524 *** 'xref-find-definitions' and 'describe-function' now display
1525 information about mode local overrides (defined by cedet/mode-local.el
1526 'define-overloadable-function' 'define-mode-local-overrides').
1528 The framework's Lisp API is still experimental and can change in major,
1529 backward-incompatible ways.
1532 ** New package Project
1534 The new package Project provides generic infrastructure for dealing
1535 with projects. The main commands included in it are
1536 'project-find-file' and 'project-find-regexp'.
1538 The Lisp API of this package is still experimental.
1541 EUDC's LDAP backend has been improved.
1544 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1547 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1548 subprocess instead of on the command line.
1551 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1552 need to configure this manually anymore.
1555 *** The LDAP configuration section of EUDC's manual has been
1558 There have also been customization changes.
1561 *** New custom variable 'eudc-server-hotlist' to allow specifying
1562 multiple EUDC servers in init file.
1565 *** Custom variable 'eudc-inline-query-format' defaults to completing
1566 on email and firstname instead of surname.
1569 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
1570 to avoid interfering with the kill ring.
1573 *** Custom variable 'eudc-inline-expansion-format' defaults to
1574 "Firstname Surname <mail-address>".
1577 *** Custom variable 'eudc-options-file' defaults to
1578 "~/.emacs.d/eudc-options".
1581 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
1582 allow overriding the regular expression that recognizes the ldapsearch
1583 command line's password prompt.
1586 EUDC's BBDB backend now supports BBDB 3.
1589 EUDC's PH backend (eudcb-ph.el) is obsolete.
1594 *** The new built-in command 'clear' can scroll window contents out of sight.
1595 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1598 *** New buffer syntax '#<buffer-name>', which is equivalent to
1599 '#<buffer buffer-name>'. This shorthand makes interacting with
1600 buffers from eshell more convenient. Custom variable
1601 'eshell-buffer-shorthand', which has been broken for a while, has been
1605 *** By default, eshell "visual" program buffers (created by
1606 'eshell-visual-commands' and similar custom vars) are no longer killed
1607 when their processes die. This fixes issues with short-lived commands
1608 and makes visual programs more useful in general. For example, if
1609 "git log" is a visual command, it will always show the visual command
1610 buffer, even if the "git log" process dies. For the old behavior,
1611 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
1616 *** Support for the Google Chrome web browser.
1619 *** Support for the Conkeror web browser.
1622 *** Support for several ancient browsers is now officially obsolete.
1625 ** tar-mode: new 'tar-new-entry' command, allowing for new members to
1626 be added to the archive.
1631 *** Dired buffers are also auto-reverted via file notifications, if
1632 Emacs is compiled with file notification support.
1635 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
1636 See <http://debbugs.gnu.org/22814>.
1638 ** File Notifications
1641 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1644 *** The new event 'stopped' signals, that a file notification watch is
1645 not active any longer.
1648 *** The new function 'file-notify-valid-p' checks, whether a file
1649 notification descriptor still corresponds to an activate watch.
1654 *** The command 'dired-do-compress' bound to 'Z' now can compress
1655 directories and decompress zip files.
1658 *** New command 'dired-do-compress-to' bound to 'c' can be used to
1659 compress many marked files into a single named archive. The
1660 compression command is determined from the new
1661 'dired-compress-files-alist' variable.
1664 *** New user interface for the 'A' and 'Q' commands.
1665 These keys, now bound to 'dired-do-find-regexp' and
1666 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
1667 and 'xref-query-replace-in-results': they present the matches
1668 in the '*xref*' buffer and let you move through the matches. No need
1669 to use 'tags-loop-continue' to resume the search or replace loop. The
1670 previous commands, 'dired-do-search' and
1671 'dired-do-query-replace-regexp', are still available, but not bound to
1672 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
1673 back. We intend to obsolete the old commands in a future release.
1675 ** Tabulated List Mode
1678 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
1679 call 'tabulated-list-init-header', in which case it will have no
1683 *** 'tabulated-list-print' takes a second optional argument, update,
1684 which specifies an alternative printing method which is faster when
1685 few or no entries have changed.
1687 ** Obsolete packages
1693 *** landmark.el (moved to elpa.gnu.org)
1696 * New Modes and Packages in Emacs 25.1
1699 ** pinentry.el allows GnuPG passphrase to be prompted through the
1700 minibuffer instead of a graphical dialog, depending on whether the gpg
1701 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1702 is set). This feature requires newer versions of GnuPG (2.1.5 or
1703 later) and Pinentry (0.9.5 or later). To use this feature, add
1704 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1705 configuration with "gpgconf --reload gpg-agent".
1708 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1709 The main entry points are 'cl-defgeneric' and 'cl-defmethod'. See the
1710 node "Generic Functions" in the Emacs Lisp manual for more details.
1713 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1714 SCSS (Sassy CSS) files.
1717 ** let-alist is a new macro (and a package) that allows one to easily
1718 let-bind the values stored in an alist.
1721 ** 'tildify-mode' allows automatic insertion of hard spaces as one
1722 types the text. Breaking line after a single-character words is
1723 forbidden by Czech and Polish typography (and may be discouraged in
1724 other languages), so 'auto-tildify-mode' makes it easier to create
1725 a typographically-correct documents.
1728 ** The 'seq' library adds sequence manipulation functions and macros
1729 that complement basic functions provided by subr.el. All functions
1730 are prefixed with 'seq-' and work on lists, strings and vectors.
1731 'pcase' accepts a new Upattern 'seq'.
1734 ** The 'map' library provides map-manipulation functions that work on
1735 alists, hash-table and arrays. All functions are prefixed with
1736 'map-'. 'pcase' accepts a new UPattern 'map'.
1739 ** The 'thunk' library provides functions and macros to control the
1740 evaluation of forms.
1743 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1744 support for JSX, an XML-like syntax extension to ECMAScript.
1747 * Incompatible Lisp Changes in Emacs 25.1
1750 ** 'setq' and 'setf' must now be called with an even number of
1751 arguments. The earlier behavior of silently supplying a nil to the
1752 last variable when there was an odd number of arguments has been
1756 ** 'syntax-begin-function' is declared obsolete.
1757 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1758 slot in font-lock-defaults.
1761 ** The new implementation of Subword mode affects word movement everywhere.
1762 When Subword mode is turned on, 'forward-word', 'backward-word', and
1763 everything that uses them will move by sub-words, effectively
1764 overriding the buffer's syntax table. Lisp programs that shouldn't be
1765 affected by Subword mode should call the new functions
1766 'forward-word-strictly' and 'backward-word-strictly' instead.
1769 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
1770 called during startup. Users who call this function in their init
1771 file and still expect it to be run after startup should set
1772 'package-enable-at-startup' to t after the call to
1773 'package-initialize'.
1776 ** ':global' minor mode use 'setq-default' rather than 'setq'.
1777 This means that you can't use 'make-local-variable' and expect them to
1778 "magically" become buffer-local.
1781 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
1782 The 'track-mouse' form no longer refrains from changing the shape of
1783 the mouse pointer for the entire time the body of that form is
1784 executed. Lisp programs that use 'track-mouse' for dragging across
1785 large portions of the Emacs display, and want to avoid changes in the
1786 pointer shape during dragging, should bind the variable 'track-mouse'
1787 to the special value 'dragging' in the body of the form.
1790 ** The optional 'predicate' argument of 'lisp-complete-symbol' no longer
1791 has any effect. (This change was made in Emacs 24.4 but was not
1792 advertised at the time.)
1795 ** 'indirect-function' does not signal 'void-function' any more.
1796 This is mostly a bug-fix, since this change was missed back in 24.4 when
1797 symbol-function was changed not to signal 'void-function' any more.
1800 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
1803 ** M-x shell and M-x compile no longer set the EMACS environment variable.
1804 This avoids clashing when other programs use the variable for other purposes.
1805 Although M-x term still sets EMACS for compatibility with Bash 4.3 and earlier,
1806 this is deprecated and will be phased out when Bash 4.4 or later takes over.
1807 Use the INSIDE_EMACS environment variable instead.
1810 ** 'save-excursion' does not save&restore the mark any more.
1811 Use 'save-mark-and-excursion' if you want the old behavior.
1814 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
1815 argument ('predicate').
1818 ** 'completion-table-dynamic' by default stays in the minibuffer.
1819 The minibuffer will be the current buffer when the function is called.
1820 If you want the old behavior of calling the function in the buffer
1821 from which the minibuffer was entered, use the new argument
1822 'switch-buffer' to 'completion-table-dynamic'.
1825 ** window-configurations no longer record the buffers' marks.
1828 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1829 active region handling.
1832 ** deactivate-mark is now buffer-local.
1835 ** 'cl-the' now asserts that its argument is of the given type.
1838 ** 'process-running-child-p' may now return a numeric process
1839 group ID instead of 't'.
1842 ** Mouse click events on mode line or header line no longer include
1843 any reference to a buffer position. The 6th member of the mouse
1844 position list returned for such events is now nil.
1847 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1848 These slots used to hold key-shortcut data, but have been obsolete since
1852 ** Emacs no longer downcases the first letter of a system diagnostic
1853 when signaling a file error. For example, it now reports "Permission
1854 denied" instead of "permission denied". The old behavior was problematic
1855 in languages like German where downcasing rules depend on grammar.
1858 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
1859 Set it to 'curve' for curved single quotes, to 'straight' for straight
1860 apostrophes, and to 'grave' for grave accent and apostrophe. The
1861 default value nil acts like 'curve' if curved single quotes are
1862 displayable, and like 'grave' otherwise. The new variable affects
1863 display of diagnostics and help, but not of info.
1866 ** substitute-command-keys now replaces quotes.
1867 That is, it converts documentation strings' quoting style as per the
1868 value of 'text-quoting-style'. Doc strings in source code can use
1869 either curved single quotes or grave accents and apostrophes. As
1870 before, characters preceded by \= are output as-is.
1873 ** Message-issuing functions 'error', 'message', etc. now convert quotes.
1874 They use the new 'format-message' function instead of plain 'format',
1875 so that they now follow user preference as per 'text-quoting-style'
1876 when processing curved single quotes, grave accents, and apostrophes
1877 in their format argument.
1880 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1881 now match multibyte characters using Unicode character properties.
1882 If you want the old behavior where they matched any character with
1883 word syntax, use '\sw' instead.
1886 ** The character classes [:graph:] and [:print:] in regular expressions
1887 no longer match every multibyte character. Instead, Emacs now
1888 consults the Unicode character properties to determine which
1889 characters are graphic or printable. In particular, surrogates and
1890 unassigned codepoints are now rejected. If you want the old behavior,
1891 use [:multibyte:] instead.
1894 ** The 'diff' command uses the unified format now. To restore the old
1895 behavior, set 'diff-switches' to '-c'.
1898 ** 'grep-template' and 'grep-find-template' values don't include the
1899 --color argument anymore. It's added at the <C> place holder position
1900 dynamically. Any third-party code that changes these templates should
1901 be updated accordingly.
1904 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
1905 The new behavior is compatible with Common Lisp and with XEmacs.
1906 This change does not affect Lisp code intended to be portable to
1907 Emacs 24.2 and earlier, which did not support unary '/'.
1910 ** The 'default-directory' value doesn't have to end slash. To make
1911 that happen, 'unhandled-file-name-directory' now defaults to calling
1912 'file-name-as-directory'.
1915 * Lisp Changes in Emacs 25.1
1919 *** New UPatterns 'quote', 'app'.
1921 *** New UPatterns can be defined with 'pcase-defmacro'.
1923 *** New vector QPattern.
1926 ** syntax-propertize is now automatically called on-demand during forward
1927 parsing functions like 'forward-sexp'.
1930 ** New hooks 'prefix-command-echo-keystrokes-functions' and
1931 'prefix-command-preserve-state-hook' allow the definition of prefix
1932 commands other than the predefined 'C-u'.
1935 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
1936 These allow conversion between buffer positions and the corresponding
1937 file byte offsets, given the file's encoding.
1940 ** The default value of 'load-read-function' is now 'read'.
1941 Previously, the default value of 'nil' implied using 'read'.
1944 ** New hook 'pre-redisplay-functions'.
1945 It is a bit easier to use than 'pre-redisplay-function'.
1948 ** The second arg of 'looking-back' should always be provided explicitly.
1949 Previously, it was an optional argument, now it's mandatory.
1952 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
1953 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
1954 implemented by the new 'cursor-intangible-mode' and
1955 'cursor-sensor-mode' minor modes.
1958 ** 'inhibit-point-motion-hooks' now defaults to 't' and is obsolete.
1959 Use the new minor modes 'cursor-intangible-mode' and
1960 'cursor-sensor-mode' instead.
1963 ** New process type 'pipe', which can be used in combination with the
1964 ':stderr' keyword of make-process to handle standard error output
1968 ** New function 'make-process' provides an alternative interface to
1969 'start-process'. It allows programs to set process parameters such as
1970 process filter, sentinel, etc., through keyword arguments (similar to
1971 'make-network-process').
1974 ** A new function 'directory-files-recursively' returns all matching
1975 files (recursively) under a directory.
1978 ** New variable 'inhibit-message', when bound to non-nil, inhibits
1979 'message' and related functions from displaying messages in the echo
1980 area. The output is still logged to the *Messages* buffer.
1983 ** A new text property 'inhibit-read-only' can be used in read-only
1984 buffers to allow certain parts of the text to be writable.
1987 ** A new variable 'comment-end-can-be-escaped' is useful in languages
1988 such as C and C++ where line comments with escaped newlines are
1989 continued to the next line.
1992 ** New macro 'define-advice'.
1995 ** Emacs Lisp now supports generators.
1996 See the "Generators" section of the ELisp manual for the details.
1999 ** New finalizer facility for running code when objects become unreachable.
2000 See the "Finalizer Type" subsection in the ELisp manual for the
2004 ** lexical closures can use (:documentation FORM) to build their docstring.
2005 It should be placed right where the docstring would be, and FORM is then
2006 evaluated (and should return a string) when the closure is built.
2009 ** define-inline provides a new way to define inlinable functions.
2012 ** New function 'macroexpand-1' to perform a single step of macro expansion.
2015 ** Some "x-*" functions were obsoleted and/or renamed:
2016 *** x-select-text is renamed gui-select-text.
2017 *** x-selection-value is renamed gui-selection-value.
2018 *** x-get-selection is renamed gui-get-selection.
2019 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
2020 *** x-get-selection-value is renamed to gui-get-primary-selection.
2021 *** x-set-selection is renamed to gui-set-selection
2024 ** New function 'string-greaterp', which return the opposite result of
2028 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
2029 preserve the collation order as defined by the system's locale(1)
2030 environment. For the time being this is implemented for modern POSIX
2031 systems and for MS-Windows, for other systems they fall back to their
2032 counterparts 'string-lessp' and 'string-equal'.
2035 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
2036 The effect is that, on systems that use ls-lisp for Dired, the default
2037 sort order of the files in Dired is now different from what it was in
2038 previous versions of Emacs. In particular, the file names are sorted
2039 disregarding punctuation, accents, and diacritics, and letter case is
2040 ignored. For example, files whose name begin with a period will no
2041 longer appear near the beginning of the directory listing. If you
2042 want the old, locale-independent sorting, customize the new option
2043 'ls-lisp-use-string-collate' to the nil value.
2046 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
2047 if set to a non-nil value, causes the above 2 functions to ignore
2048 symbol and punctuation characters when collating strings. This
2049 emulates the behavior of modern Posix platforms when the locale's
2050 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
2051 MS-Windows doesn't support UTF-8 as codeset in its locales.
2054 ** New function 'alist-get', which is also a valid place (aka lvalue).
2057 ** New function 'funcall-interactively', which works like 'funcall'
2058 but makes 'called-interactively-p' treat the function as (you guessed it)
2059 called interactively.
2062 ** New function 'function-put' to use instead of 'put' for function properties.
2065 ** The new function 'bidi-find-overridden-directionality' allows you to
2066 find characters whose directionality was, perhaps maliciously,
2067 overridden by directional override control characters. Lisp programs
2068 can use this to detect potential phishing of URLs and other links that
2069 exploits bidirectional display reordering.
2072 ** The new function 'buffer-substring-with-bidi-context' allows you to
2073 copy a portion of a buffer into a different location while preserving
2074 the visual appearance both of the copied text and the text at
2075 destination, even when the copied text includes mixed bidirectional
2076 text and directional control characters.
2079 ** New properties that can be specified with 'declare':
2080 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
2081 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
2082 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
2086 ** New macro 'with-file-modes', for evaluating expressions with default file
2087 permissions set to temporary values (e.g., for creating private files).
2090 ** You can access the slots of structures using 'cl-struct-slot-value'.
2093 ** Function 'sort' can deal with vectors.
2096 ** Function 'system-name' now returns an updated value if the current
2097 system's name has changed or if the Emacs process has changed systems,
2098 and to avoid long waits it no longer consults DNS to canonicalize the
2099 name. The variable 'system-name' is now obsolete.
2102 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
2105 ** If 'pwd' is called with a prefix argument, insert the current default
2109 ** New functions return extended information about fonts and faces.
2112 *** The function 'font-info' now returns more details about a font.
2113 In particular, it now returns the average width of the font's
2114 characters, which can be used for geometry-related calculations.
2117 *** A new function 'default-font-width' returns the average width of a
2118 character in the current buffer's default font. If the default face
2119 is remapped (see 'face-remapping-alist'), the value for the remapped
2120 face is returned. This function complements the existing function
2121 'default-font-height'.
2124 *** New functions 'window-font-height' and 'window-font-width' return
2125 the height and average width of characters in a specified face and
2126 window. If FACE is remapped (see 'face-remapping-alist'), the
2127 function returns the information for the remapped face.
2130 *** A new function 'window-max-chars-per-line' returns the maximal
2131 number of characters that can be displayed on one line. If a face
2132 and/or window are provided, these values are used for the
2133 calculation. This function is different from 'window-body-width' in
2134 that it accounts for (i) continuation glyphs, (ii) the size of the
2135 font, and (iii) the specified window.
2138 ** New utilities in subr-x.el:
2139 *** New macros 'if-let' and 'when-let' allow defining bindings and to
2140 execute code depending whether all values are true.
2141 *** New macros 'thread-first' and 'thread-last' allow threading a form
2142 as the first or last argument of subsequent forms.
2145 ** Documentation strings now support quoting with curved single quotes
2146 in addition to the old style with grave accent and apostrophe. The
2147 new style looks better on today's displays. In the new Electric Quote
2148 mode, you can enter curved single quotes into documentation by typing
2149 grave accent and apostrophe. Outside Electric Quote mode, you can
2150 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
2151 works) by typing 'A-[' and 'A-]'. As described above under
2152 'text-quoting-style', the user can specify how to display doc string
2156 ** New function 'format-message' is like 'format' and also converts
2157 curved single quotes, grave accents and apostrophes as per
2158 'text-quoting-style'.
2161 ** show-help-function's arg is converted via substitute-command-keys
2162 before being passed to the function. Help strings, help-echo
2163 properties, etc. can therefore contain command key escapes and
2167 ** Time-related changes:
2169 *** Time conversion functions now accept an optional ZONE argument
2170 that specifies the time zone rules for conversion. ZONE is omitted or
2171 nil for Emacs local time, t for Universal Time, 'wall' for system wall
2172 clock time, or a string as in the TZ environment variable. The
2173 affected functions are 'current-time-string', 'current-time-zone',
2174 'decode-time', and 'format-time-string'. The function 'encode-time',
2175 which already accepted a simple time zone rule argument, has been
2176 extended to accept all the new forms.
2178 *** Incompatible change in the third argument of 'format-time-string'.
2179 Previously, any non-nil argument was interpreted as specifying Universal Time.
2180 This is no longer true; packages that want Universal Time should pass t
2181 as the third argument.
2183 *** Time-related functions now consistently accept numbers
2184 (representing seconds since the epoch) and nil (representing the
2185 current time) as well as the usual list-of-integer representation.
2186 Affected functions include 'current-time-string', 'current-time-zone',
2187 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
2188 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
2189 'time-to-days', and 'time-to-seconds'.
2191 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
2194 *** 'calendar-next-time-zone-transition', 'time-add', and
2195 'time-subtract' no longer return time values in the obsolete and
2196 undocumented integer-pair format. Instead, they return a list of two
2200 ** New function 'set-binary-mode' allows switching a standard stream
2201 of the Emacs process to binary I/O mode.
2204 ** The new function 'directory-name-p' can be used to check whether a file
2205 name (as returned from, for instance, 'file-name-all-completions') is
2206 a directory file name. It returns non-nil if the last character in
2207 the name is a directory separator character (forward slash on GNU and
2208 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2211 ** ASCII approximations to curved quotes are put in standard-display-table
2212 if the terminal cannot display curved quotes.
2215 ** Standard output and error streams now transliterate characters via
2216 standard-display-table, and encode output using locale-coding-system.
2217 To force a specific encoding, bind 'coding-system-for-write' to the
2218 coding-system of your choice when invoking functions like 'prin1' and
2222 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
2225 ** New possible value for 'system-type': 'nacl'.
2226 This is used by Google's Native Client (NaCl).
2228 ** Miscellaneous name change
2231 For consistency with the usual Emacs spelling, the Lisp variable
2232 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
2233 The old name should still work, as an obsolescent alias.
2235 ** Changes in Frame- and Window- Handling
2238 *** Emacs can now draw horizontal scroll bars on some platforms that
2239 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2240 Horizontal scroll bars are turned off by default.
2242 **** New function 'horizontal-scroll-bars-available-p' telling whether
2243 horizontal scroll bars are available on the underlying system.
2245 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
2246 bars on all existing and future frames.
2248 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
2249 scroll bars on the selected frame.
2251 **** New frame parameters 'horizontal-scroll-bars' and
2252 'scroll-bar-height' to set horizontal scroll bars and their height
2253 for individual frames and in 'default-frame-alist'.
2255 **** New functions 'frame-scroll-bar-height' and
2256 'window-scroll-bar-height' return the height of horizontal scroll
2257 bars on a specific frame or window.
2259 **** 'set-window-scroll-bars' now accepts five parameters where the last
2260 two specify height and type of the window's horizontal scroll bar.
2262 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
2265 **** New buffer-local variables 'horizontal-scroll-bar' and
2266 'scroll-bar-height'.
2269 *** New functions 'frame-geometry' and 'frame-edges' give access to a
2273 *** New functions 'mouse-absolute-pixel-position' and
2274 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
2278 *** The function 'window-edges' now accepts three additional arguments to
2279 retrieve body, absolute and pixel edges of the window.
2282 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
2283 'window-inside-absolute-pixel-edges' have been renamed to respectively
2284 'window-body-edges', 'window-body-pixel-edges' and
2285 'window-absolute-body-pixel-edges'. The old names are kept as aliases.
2288 *** New function 'window-absolute-pixel-position' to get the screen
2289 coordinates of a visible buffer position.
2292 *** The height of a frame's menu and tool bar are no longer counted in the
2293 frame's text height. This means that the text height stands only for
2294 the height of the frame's root window plus that of the echo area (if
2295 present). This was already the behavior for frames with external tool
2296 and menu bars (like in the Gtk builds) but has now been extended to all
2300 *** Frames now do not necessarily preserve the number of columns or lines
2301 they display when setting default font, menu bar, fringe width, or
2302 scroll bars. In particular, maximized and fullscreen frames are
2303 conceptually never resized if such settings change. For fullheight and
2304 fullwidth frames, the behavior may depend on the toolkit used.
2305 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
2306 setting default font, menu bar, fringe width, or scroll bars of a
2307 specific frame does not resize that frame in order to preserve the
2308 number of columns or lines it displays.
2311 *** New function 'window-preserve-size' allows you to preserve the size of
2312 a window without "fixing" it. It's supported by 'fit-window-to-buffer',
2313 'temp-buffer-resize-mode' and 'display-buffer'.
2316 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
2317 This displays the buffer in an existing frame other than the current
2318 frame, and allows the caller to specify a frame predicate to exclude
2322 *** New minor mode 'window-divider-mode' and options
2323 'window-divider-default-places', 'window-divider-default-bottom-width'
2324 and 'window-divider-default-right-width'.
2327 *** The window displaying the '*Completions*' buffer with minibuffer
2328 completion candidates is now shown at the bottom of the selected
2329 frame. The size of that window is always as large as required to
2330 display all the candidates, except when limited by the minimum size
2331 of the other windows on that frame; those other windows are resized
2332 to provide space for the '*Completions*' display. The Emacs manual
2333 describes how to customize 'display-buffer-alist' to get back the old
2334 behavior, see the node "Temporary Displays" there.
2337 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2338 Those features have been deprecated in Gtk+ for a long time.
2343 *** etags no longer qualifies class members by default.
2345 By default, 'etags' will not qualify class members for Perl and C-like
2346 object-oriented languages with their class names and namespaces, and
2347 will remove qualifications used explicitly in the code from the tag
2348 names it puts in TAGS files. This is so the etags.el back-end for
2349 'xref-find-definitions' is more accurate and produces less false
2352 Use --class-qualify (-Q) if you want the old default behavior of
2353 qualifying class members in C++, Java, Objective C, and Perl. Note
2354 that using -Q might make some class members become "unknown" to 'M-.'
2355 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
2356 qualified names by hand.
2359 *** New language Ruby
2361 Names of modules, classes, methods, functions, and constants are
2362 tagged. Overloaded operators are also tagged.
2366 Names of packages, functions, and types are tagged.
2369 *** Improved support for Lua
2371 Etags now tags functions even if the "function" keyword follows some
2372 whitespace at line beginning.
2375 * Changes in Emacs 25.1 on Non-Free Operating Systems
2378 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2379 This includes the makefile.w32-in files in various subdirectories, and
2380 the support files. The file nt/configure.bat now just tells the user
2381 to use the procedure described in nt/INSTALL, by running the Posix
2382 'configure' script in the top-level directory.
2385 ** Building Emacs for MS-Windows requires at least Windows XP
2386 or Windows Server 2003. The built binaries still run on all versions
2387 of Windows starting with Windows 9X.
2390 ** Emacs running on MS-Windows now supports the daemon mode.
2393 ** The byte counts in etags-generated TAGS files are now the same on
2394 MS-Windows as they are on other platforms.
2397 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2398 Pass '--without-ns' to configure to create an X11 build, the old default.
2401 ** OS X 10.5 or older is no longer supported.
2404 ** OS X on PowerPC is no longer supported.
2407 ** New variable 'ns-use-fullscreen-animation' controls animation for
2408 non-native NS fullscreen. The default is nil. Set to t to enable
2409 animation when entering and leaving fullscreen. For native OSX fullscreen
2413 ** The new function 'w32-application-type' returns the type of an
2414 MS-Windows application given the name of its executable program file.
2416 ** New variable 'w32-pipe-buffer-size'.
2417 It can be used to tune the size of the buffer of pipes created for
2418 communicating with subprocesses, when the program run by a subprocess
2419 exhibits unusual buffering behavior. Default is zero, which lets the
2420 OS use its default size.
2423 ----------------------------------------------------------------------
2424 This file is part of GNU Emacs.
2426 GNU Emacs is free software: you can redistribute it and/or modify
2427 it under the terms of the GNU General Public License as published by
2428 the Free Software Foundation, either version 3 of the License, or
2429 (at your option) any later version.
2431 GNU Emacs is distributed in the hope that it will be useful,
2432 but WITHOUT ANY WARRANTY; without even the implied warranty of
2433 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2434 GNU General Public License for more details.
2436 You should have received a copy of the GNU General Public License
2437 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2443 paragraph-separate: "[
\f]*$"