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 ** `process-attributes' on Darwin systems now return more information.
63 ** A number of accessors for the value returned by 'file-attributes'
64 has been added. They are: 'file-attribute-type',
65 'file-attribute-link-number', 'file-attribute-user-id',
66 'file-attribute-group-id', 'file-attribute-access-time',
67 'file-attribute-modification-time',
68 'file-attribute-status-change-time', 'file-attribute-size',
69 'file-attribute-modes', 'file-attribute-inode-number', and
70 'file-attribute-device-number'
73 ** The new function 'buffer-hash' has been added, and can be used to
74 compute a fash, non-consing hash of the contents of a buffer.
77 ** 'fill-paragraph' no longer marks the buffer as changed unless it
78 actually changed something.
81 ** The locale language name 'ca' is now mapped to the language
82 environment 'Catalan', which has been added.
85 ** 'align-regexp' has a separate history for its interactive argument
86 'align-regexp' no longer shares its history with all other
87 history-less functions that use 'read-string'
90 ** The networking code has been reworked so that it's more
91 asynchronous than it was (when specifying :nowait t in
92 'make-network-process'). How asynchronous it is varies based on the
93 capabilities of the system, but on a typical GNU/Linux system the DNS
94 resolution, the connection, and (for TLS streams) the TLS negotiation
95 are all done without blocking the main Emacs thread. To get
96 asynchronous TLS, the TLS boot parameters have to be passed in (see
97 the manual for details).
99 Certain process oriented functions (like 'process-datagram-address')
100 will block until socket setup has been performed. The recommended way
101 to deal with asynchronous sockets is to avoid interacting with them
102 until they have changed status to "run". This is most easily done
103 from a process sentinel.
105 ** 'make-network-process' and 'open-network-stream' sometimes allowed
106 :service to be an integer string (e.g., :service "993") and sometimes
107 required an integer (e.g., :service 993). This difference has been
108 eliminated, and integer strings work everywhere.
110 ** It is possible to disable attempted recovery on fatal signals
112 Two new variables allow to disable attempts to recover from stack
113 overflow and to avoid automatic auto-save when Emacs is delivered a
114 fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
115 will disable attempts to recover from C stack overflows; Emacs will
116 then crash as with any other fatal signal.
117 'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
118 disable attempts to auto-save the session and shut down in an orderly
119 fashion when Emacs receives a fatal signal; instead, Emacs will
120 terminate immediately. Both variables are non-'nil' by default.
121 These variables are for users who would like to avoid the small
122 probability of data corruption due to techniques Emacs uses to recover
126 ** A second dir-local file (.dir-locals-2.el) is now accepted.
127 See the variable 'dir-locals-file-2' for more information.
130 ** International domain names (IDNA) are now encoded via the new
131 puny.el library, so that one can visit web sites with non-ASCII URLs.
134 ** The new 'timer-list' command lists all active timers in a buffer
135 where you can cancel them with the 'c' command.
138 ** New function 'read-multiple-choice' use to prompt for
139 multiple-choice questions, with a handy way to display help texts.
142 * Editing Changes in Emacs 25.2
145 ** New bindings for 'query-replace-map'.
146 'undo', undo the last replacement; bound to 'u'.
147 'undo-all', undo all replacements; bound to 'U'.
150 * Changes in Specialized Modes and Packages in Emacs 25.2
155 *** Messages from CMake are now recognized.
160 *** In wdired, when editing files to contain slash characters,
161 the resulting directories are automatically created. Whether
162 to do this or not is controlled by the
163 'wdired-create-parent-directories' variable.
166 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
167 viewing HTML files and the like.
172 *** A new 's' command for switching to another eww buffer via the minibuffer.
175 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
176 with the 'o' command from 'image-map'.
179 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
180 whether to use the HTML-specified colors or not. The user can also
181 customize the 'shr-use-colors' variable.
184 *** Images that are being loaded are now marked with grey
185 "placeholder" images of the size specified by the HTML. They are then
186 replaced by the real images asynchronously, which will also now
187 respect width/height HTML specs (unless they specify widths/heights
188 bigger than the current window).
193 *** Images are automatically scaled before displaying based on the
194 'image-scaling-factor' variable (if Emacs supports scaling the images
198 *** Images inserted with 'insert-image' and related functions get a
199 keymap put into the text properties (or overlays) that span the
200 image. This keymap binds keystrokes for manipulating size and
201 rotation, as well as saving the image to a file. These commands are
202 also available in 'image-mode'.
205 *** A new library for creating and manipulating SVG images has been
206 added. See the "SVG Images" section in the lispref manual for
210 *** New setf-able function to access and set image parameters is
211 provided: 'image-property'.
214 ** The commands that add ChangeLog entries now prefer a VCS root directory
215 for the ChangeLog file, if none already exists. Customize
216 'change-log-directory-files' to nil for the old behavior.
219 ** Support for non-string values of 'time-stamp-format' has been removed.
224 *** `message-use-idna' now defaults to t (because Emacs comes with
225 built-in IDNA support now).
228 *** The 'message-valid-fqdn-regexp' variable has been removed, since
229 there are now top-level domains added all the time. Message will no
230 longer warn about sending emails to top-level domains it hasn't heard
233 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
234 In 'visual-line-mode' it will look for the true beginning of a header
235 while in non-'visual-line-mode' it will move the point to the indented
241 *** New connection method "sg", which allows to edit files under
245 *** New connection method "doas" for OpenBSD hosts.
248 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
253 *** Support for completing attribute values and bang-rules using the
254 'completion-at-point' command.
257 ** Emacs now supports character name escape sequences in character and
258 string literals. The syntax variants \N{character name} and
259 \N{U+code} are supported.
262 ** Prog mode has some support for multi-mode indentation.
263 This allows better indentation support in modes that support multiple
264 programming languages in the same buffer, like literate programming
265 environments or ANTLR programs with embedded Python code.
267 A major mode can provide indentation context for a sub-mode through
268 the 'prog-indentation-context' variable. To support this, modes that
269 provide indentation should use 'prog-widen' instead of 'widen' and
270 'prog-first-column' instead of a literal zero. See the node
271 "Mode-Specific Indent" in the ELisp manual for more details.
275 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
281 *** The new function 'url-cookie-delete-cookie' can be used to
282 programmatically delete all cookies, or cookies from a specific
285 *** The URL package now support https over proxies supporting CONNECT.
287 ** VC and related modes
290 *** The VC state indicator in the mode line now defaults to more
291 colorful faces to make it more obvious to the user what the state is.
292 See the 'vc-faces' customization group.
295 * New Modes and Packages in Emacs 25.2
298 * Incompatible Lisp Changes in Emacs 25.2
301 ** Resizing a frame no longer runs 'window-configuration-change-hook'.
302 Put your function on 'window-size-change-functions' instead.
304 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
305 mode to send the same escape sequences that xterm does. This makes
306 things like forward-word in readline work.
309 ** hideshow mode got four key bindings that are analogous to outline
310 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
312 ** The grep/rgrep/lgrep functions will now ask about saving files
313 before running. This is controlled by the 'grep-save-buffers'
317 * Lisp Changes in Emacs 25.2
319 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
321 ** Autoload files can be generated without timestamps,
322 by setting 'autoload-timestamps' to nil.
323 FIXME As an experiment, nil is the current default.
324 If no insurmountable problems before next release, it can stay that way.
326 ** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
330 ** 'gnutls-boot' now takes a parameter :complete-negotiation that says
331 that negotiation should complete even on non-blocking sockets.
334 ** New functions 'window-pixel-width-before-size-change' and
335 'window-pixel-height-before-size-change' allow to detect which window
336 changed size when 'window-size-change-functions' are run.
339 ** New function 'display-buffer-reuse-mode-window' is an action function
340 suitable for use in 'display-buffer-alist'. For example, to avoid creating
341 a new window when opening man pages when there's already one, use
342 (add-to-list 'display-buffer-alist
343 '("\\`\\*Man .*\\*\\'" .
344 (display-buffer-reuse-mode-window
345 (inhibit-same-window . nil)
349 ** There is now a new variable 'flyspell-sort-corrections-function'
350 that allows changing the way corrections are sorted.
353 ** The new command 'fortune-message' has been added, which displays
354 fortunes in the echo area.
357 ** New function 'func-arity' returns information about the argument list
358 of an arbitrary function.
359 This is a generalization of 'subr-arity' for functions that are not
360 built-in primitives. We recommend using this new function instead of
364 ** 'parse-partial-sexp' state has a new element. Element 10 is
365 non-nil when the last character scanned might be the first character
366 of a two character construct, i.e. a comment delimiter or escaped
367 character. Its value is the syntax of that last character.
370 ** 'parse-partial-sexp''s state, element 9, has now been confirmed as
371 permanent and documented, and may be used by Lisp programs. Its value
372 is a list of currently open parenthesis positions, starting with the
373 outermost parenthesis.
376 ** 'read-color' will now display the color names using the color itself
377 as the background color.
379 ** The function 'redirect-debugging-output' now works on platforms
380 other than GNU/Linux.
383 ** The new function 'string-version-lessp' compares strings by
384 interpreting consecutive runs of numerical characters as numbers, and
385 compares their numerical values. According to this predicate,
386 "foo2.png" is smaller than "foo12.png".
389 ** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
390 Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
391 two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
392 ('sxhash-eql') on them will be the same.
395 ** Function 'sxhash' has been renamed to 'sxhash-equal' for
396 consistency with the new functions. For compatibility, 'sxhash'
397 remains as an alias to 'sxhash-equal'.
400 ** Time conversion functions that accept a time zone rule argument now
401 allow it to be OFFSET or a list (OFFSET ABBR), where the integer
402 OFFSET is a count of seconds east of Universal Time, and the string
403 ABBR is a time zone abbreviation. The affected functions are
404 'current-time-string', 'current-time-zone', 'decode-time',
405 'format-time-string', and 'set-time-zone-rule'.
408 * Changes in Emacs 25.2 on Non-Free Operating Systems
410 ** Intercepting hotkeys on Windows 7 and later now works better.
411 The new keyboard hooking code properly grabs system hotkeys such as
412 Win-* and Alt-TAB, in a way that Emacs can get at them before the
413 system. This makes the 'w32-register-hot-key' functionality work
414 again on all versions of MS-Windows starting with Windows 7. On
415 Windows NT and later you can now register any hotkey combination. (On
416 Windows 9X, the previous limitations, spelled out in the Emacs manual,
420 * Installation Changes in Emacs 25.1
423 ** Building Emacs now requires C99 or later.
426 ** Building Emacs now requires GNU make, version 3.81 or later.
429 ** New configure option --with-cairo.
430 This builds Emacs with Cairo drawing. As a side effect, it provides
431 support for built-in printing, when Emacs was built with GTK+.
432 Cairo drawing is an experimental feature in Emacs, and subject to
433 change in future releases.
436 ** New configure option --with-modules.
437 This enables support for loading dynamic modules; see below.
440 ** By default, Emacs no longer works on IRIX. We expect that Emacs
441 users are not affected by this, as SGI stopped supporting IRIX in
442 December 2013. If you are affected, please send a bug report. You
443 should be able to work around the problem either by porting the Emacs
444 undumping code to GCC under IRIX, or by configuring --with-wide-int,
445 or by sticking with Emacs 24.4.
448 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
449 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
450 since Emacs 24.4, and the other variants were undocumented and were
451 obstacles to maintenance and development. GC_MARK_STACK and its
452 related symbols have been removed from the C internals.
455 ** 'configure' now prefers gnustep-config when configuring GNUstep.
456 If gnustep-config is not available, the old heuristics are used.
459 ** 'configure' now prefers inotify to gfile for file notification,
460 unless gfile is explicitly requested via --with-file-notification='gfile'.
463 ** 'configure' detects the kqueue file notification library on *BSD
464 and Mac OS X machines.
467 ** The configure option '--with-pkg-config-prog' has been removed.
468 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
471 ** The configure option '--with-mmdf' has been removed.
472 It was no longer useful, as it relied on libraries that are no longer
473 supported, and its presence led to confusion during configuration.
474 This affects only the 'movemail' utility; Emacs itself can still
475 process MMDF-format files as before.
478 ** The configure option '--enable-silent-rules' is now the default,
479 and silent rules are now quieter. To get the old behavior where
480 'make' chatters a lot, configure with '--disable-silent-rules' or
481 build with 'make V=1'.
484 ** The configure option '--with-gameuser' now allows you to specify a
485 group instead of a user if its argument is prefixed by ':' (a colon).
486 This will cause the game score files in ${localstatedir}/games/emacs
487 to be owned by that group, and the helper program for updating them to
488 be installed setgid. The option now defaults to the 'games' group.
491 ** The 'grep-changelog' script (and its manual page) are no longer included.
492 It has no particular connection to Emacs and has not changed in years,
493 so if you want to use it, you can always take a copy from an older Emacs.
496 ** Emacs 25 comes with a new set of icons.
497 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
498 The old Emacs logo icons are available as 'emacs23.png' in the same location.
501 ** New make target 'check-expensive' to run additional tests.
502 This includes all tests which run via "make check", plus additional
503 tests which take more time to perform.
506 * Startup Changes in Emacs 25.1
509 ** When Emacs is given a file as a command line argument and
510 'initial-buffer-choice' is non-nil, display both the file and
511 'initial-buffer-choice'. When Emacs is given more than one file and
512 'initial-buffer-choice' is non-nil, show 'initial-buffer-choice'
513 and *Buffer List*. This makes Emacs convenient to use from the
514 command line when 'initial-buffer-choice' is non-nil.
517 ** The value of 'initial-scratch-message' is now treated as a doc string
518 and can contain escape sequences for command keys, quotes, and the like.
521 ** The default height of GUI frames was enlarged.
522 This is so there's enough space in the initial window to display the
523 optional text about recovering crashes sessions, without losing the
524 splash image display.
527 * Changes in Emacs 25.1
530 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
531 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
532 xwidget support, you can access the embedded webkit browser with 'M-x
533 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
534 browser. The buffer will have a new mode, 'xwidget-webkit-mode'
535 (similar to 'image-mode'), which supports the webkit widget.
538 *** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
539 'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
540 'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
541 'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
542 'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
543 'xwidget-webkit-scroll-up'.
546 ** Emacs can now load shared/dynamic libraries (modules).
547 A dynamic Emacs module is a shared library that provides additional
548 functionality for use in Emacs Lisp programs, just like a package
549 written in Emacs Lisp would. The functions 'load', 'require',
550 'load-file', etc. were extended to load such modules, as they do with
551 Emacs Lisp packages. The new variable 'module-file-suffix' holds the
552 system-dependent value of the file-name extension ('.so' on Posix
553 hosts) of the module files.
555 A module should export a C-callable function named
556 'emacs_module_init', which Emacs will call as part of the call to
557 'load' or 'require' which loads the module. It should also export a
558 symbol named 'plugin_is_GPL_compatible' to indicate that its code is
559 released under the GPL or compatible license; Emacs will refuse to
560 load modules that don't export such a symbol.
562 If a module needs to call Emacs functions, it should do so through the
563 API defined and documented in the header file 'emacs-module.h'. Note
564 that any module that provides Lisp-callable functions will have to use
565 Emacs functions such as 'fset' and 'funcall', in order to register its
566 functions with the Emacs Lisp interpreter.
568 Modules can create 'user-ptr' Lisp objects that embed pointers to C
569 structs defined by the module. This is useful for keeping around
570 complex data structures created by a module, to be passed back to the
571 module's functions. User-ptr objects can also have associated
572 "finalizers" -- functions to be run when the object is GC'ed; this is
573 useful for freeing any resources allocated for the underlying data
574 structure, such as memory, open file descriptors, etc. A new
575 predicate 'user-ptrp' returns non-nil if its argument is a 'user-ptr'
578 Loadable modules in Emacs are an experimental feature, and subject to
579 change in future releases. For that reason, their support is disabled
580 by default, and must be enabled by using the '--with-modules' option
584 ** Network security (TLS/SSL certificate validity and the like) is
585 added via the new Network Security Manager (NSM) and controlled via
586 the 'network-security-level' variable.
589 ** C-h l now also lists the commands that were run.
592 ** x-select-enable-clipboard is renamed select-enable-clipboard
593 and x-select-enable-primary is renamed select-enable-primary.
594 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
595 name it), with the proviso that on some systems (e.g. Windows)
596 select-enable-primary is ineffective since the system doesn't
597 have the equivalent of a primary selection.
600 ** New option 'switch-to-buffer-in-dedicated-window' allows you to
601 customize how 'switch-to-buffer' proceeds interactively when the
602 selected window is strongly dedicated to its buffer.
605 ** The option 'even-window-heights' has been renamed to
606 'even-window-sizes' and now handles window widths as well.
609 ** terpri gets an optional arg ENSURE to conditionally output a newline.
612 ** 'insert-register' now leaves point after the inserted text
613 when called interactively. A prefix argument toggles this behavior.
616 ** The new variable 'term-file-aliases' replaces some files from lisp/term.
617 The function 'tty-run-terminal-initialization' consults this variable
618 when deciding what terminal-specific initialization code to run.
621 ** New variable 'system-configuration-features', listing some of the
622 main features that Emacs was compiled with. This is mainly intended
623 for use in Emacs bug reports.
626 ** A password is now hidden also when typed in batch mode. Another
627 hiding character but the default '.' can be used by let-binding the
628 variable 'read-hide-char'.
631 ** The Emacs pseudo-random number generator can be securely seeded.
632 On system where Emacs can access the system entropy or some other
633 cryptographically secure random stream, it now uses that when 'random'
634 is called with its argument 't'. This allows cryptographically strong
635 random values; in particular, the Emacs server now uses this facility
636 to produce its authentication key.
639 ** New input methods: 'tamil-dvorak' and 'programmer-dvorak'.
642 * Editing Changes in Emacs 25.1
645 ** M-x suggests shorthands and ignores obsolete commands for completion.
650 *** Successive single-char deletions are collapsed in the undo-log just like
651 successive char insertions. Which commands invoke this behavior is
652 controlled by the new 'undo-auto-amalgamate' function. See the node
653 "Undo" in the ELisp manual for more details.
656 *** The heuristic used to insert 'undo-boundary' after each command
657 has changed, so that if a command causes changes in more than just the
658 current buffer, Emacs now calls 'undo-boundary' in every buffer
659 affected by the command.
662 ** New command 'comment-line' bound to 'C-x C-;'.
664 ** New and improved facilities for inserting Unicode characters
667 *** Unicode names entered via C-x 8 RET now use substring completion by default.
670 *** C-x 8 now has shorthands for several chars, such as U+2010
671 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH). As
672 before, you can type C-x 8 C-h to list shorthands.
675 *** New minor mode electric-quote-mode for using curved quotes as you
676 type. See also the new variable 'text-quoting-style'.
679 ** New minor mode global-eldoc-mode is enabled by default.
682 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
683 Bracketed paste mode causes text terminals to wrap pasted text in special
684 escape sequences that allow Emacs to tell the difference between text
685 you type and text you paste from other applications. Emacs then
686 avoids interpreting each character in the pasted text as it does with
687 keyboard input, which results in a paste experience similar to that
688 under a window system, and significant performance improvements when
689 pasting large amounts of text.
691 Bracketed paste mode is disabled by default, so Emacs automatically
692 enables it at startup if the terminal supports it.
695 ** Emacs now supports the latest version of the UBA.
696 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
697 was updated to support all the latest additions and changes introduced
698 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
699 This includes full support for directional isolates and the
700 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
704 ** You can access 'mouse-buffer-menu' (C-down-mouse-1) using C-f10.
707 ** New buffer-local 'electric-pair-local-mode'.
710 ** New variable 'fast-but-imprecise-scrolling' inhibits
711 fontification during full screen scrolling operations, giving less
712 hesitant operation during auto-repeat of C-v, M-v at the cost of
713 possible inaccuracies in the end position.
716 ** New documentation command 'describe-symbol'.
717 Works for functions, variables, faces, etc. It is bound to 'C-h o' by
721 ** New function 'custom-prompt-customize-unsaved-options' checks for
722 unsaved customizations and prompts user to customize (if found). It
723 is intended for adding to 'kill-emacs-query-functions'.
726 ** The old 'C-x w' bindings in hi-lock-mode are officially deprecated
727 in favor of the global 'M-s h' bindings introduced in Emacs-23.1.
728 They'll disappear soon.
731 * Changes in Specialized Modes and Packages in Emacs 25.1
736 *** New command 'checkdoc-package-keywords' checks if the
737 current package keywords are recognized. Set the new option
738 'checkdoc-package-keywords-flag' to non-nil to make
739 'checkdoc-current-buffer' call this function automatically.
742 *** New function 'checkdoc-file' checks for style errors.
743 It's meant for use together with 'compile':
744 emacs -batch --eval "(checkdoc-file \"subr.el\")"
749 *** The desktop format version has been upgraded from 206 to 208.
750 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
751 cannot read a version 208 desktop. To upgrade your desktop file, you
752 must explicitly request the upgrade, by C-u M-x desktop-save. You are
753 recommended to do this as soon as you have firmly upgraded to Emacs
754 25.1 (or later). Should you ever need to downgrade your desktop file
755 to version 206, you can do this with C-u C-u M-x desktop-save.
758 ** New function 'bookmark-set-no-overwrite' bound to C-x r M.
759 It raises an error if a bookmark of that name already exists,
760 unlike 'bookmark-set' which silently updates an existing bookmark.
765 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
766 now control how mm-* functions fetch and display images in an HTML
767 message. Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
768 for that purpose, i.e., binds mm-html- variables with those gnus-
769 variables, but other packages do not have to bind gnus- variables now.
772 *** 'mm-inline-text-html-with-images' has been removed.
773 Use 'mm-html-inhibit-images' instead. Note that the value is opposite
779 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
780 GnuTLS encryption functions if possible.
785 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
786 the ordering of object keys by default.
789 *** New commands 'json-pretty-print-ordered' and
790 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
791 object keys sorted alphabetically.
793 ** Prettify Symbols mode
796 *** Prettify Symbols mode supports custom composition predicates. By
797 overriding the default 'prettify-symbols-compose-predicate', modes can
798 specify in which contexts a symbol may be displayed as some Unicode
799 character. 'prettify-symbols-default-compose-p' is the default which
800 is suitable for most programming languages such as C or Lisp (but not
804 *** Symbols can be unprettified while point is inside them.
805 New variable 'prettify-symbols-unprettify-at-point' configures this.
807 ** Enhanced xterm support
810 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
811 This variable tells Emacs which advanced capabilities are available in
812 the xterm terminal emulator used to display Emacs text-mode frames.
813 The default is to check each capability, and use it if available.
814 (This variable was introduced in Emacs 24.1, but was not announced in
818 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
819 in the surrounding GUI (using the OSC-52 escape sequence). This only works
820 if your xterm supports it and enables the 'allowWindowOps' options (disabled
821 by default at least in Debian, for security reasons).
823 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
824 escape sequence) if your xterm has the feature enabled but for that you
825 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
828 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
831 ** The way to turn on and off 'save-place' mode has changed.
832 It is no longer sufficient to load the saveplace library and set
833 'save-place' non-nil. Instead, use the two new minor modes:
834 'save-place-mode' turns on saving last place in every file, and
835 'save-place-local-mode' does that only for the file in whose buffer it
836 is invoked. The 'save-place' variable is now an obsolete alias for
837 'save-place-mode', which replaces it, and 'toggle-save-place' is an
838 obsolete alias for the new 'save-place-local-mode' command.
843 *** ERC can now hide message types by network or channel.
844 'erc-hide-list' will hide all messages of the specified type, while
845 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
846 specified message types for the respective specified targets.
849 *** Reconnection is now asynchronous.
852 *** Nick completion is now case-insensitive again after inadvertently
853 being made case-sensitive in Emacs 24.2.
858 *** New commands, key binds, and menu items.
860 **** '<' and '>' for navigating previous and next tracks in playlist
862 **** New play/pause command 'mpc-toggle-play' bound to 's'
864 **** 'g' bound to new command 'mpc-seek-current' will navigate current
867 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
868 toggling playback modes.
871 *** Now supports connecting to a UNIX domain socket.
874 *** Looks at more image file names to use as album art.
875 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
876 (XP) in addition to cover.jpg.
879 *** Searches in more locations for MPD configuration files.
880 MPD supports the XDG base directory specification since version 0.17.6.
885 *** 'midnight-mode' is now a proper minor mode.
888 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
893 *** New "external" package status.
894 An external package is any installed package that's not built-in and
895 not from 'package-user-dir', which usually means it's from an entry in
896 'package-directory-list'. They are treated much like built-in
897 packages, in that they cannot be deleted through the package menu and
898 are not considered for upgrades.
900 The effect is that a user can manually place a specific version of a
901 package inside 'package-directory-list' and the package menu will
905 *** If a package is available on multiple archives and one has higher
906 priority (as per 'package-archive-priorities') only that one is
907 listed. This can be configured with 'package-menu-hide-low-priority'.
910 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
911 This includes the above-mentioned low-priority packages, as well as
912 available packages whose version is lower than the currently installed
913 version (which were previously impossible to display).
914 This allows users to downgrade a package if a lower version is
918 *** When filtering the package menu, keywords starting with "arc:" or
919 "status:" represent package archive or status, respectively, instead
923 *** Most functions which involve downloading information now take an
924 ASYNC argument. If it is non-nil, package.el performs the download(s)
928 *** New variable 'package-menu-async' controls whether the
929 package-menu uses asynchronous downloads.
932 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
933 This follows the same rules as installing from a .tar file, except the
934 -pkg file is optional.
937 *** Packages which are dependencies of other packages cannot be deleted.
938 The FORCE argument to 'package-delete' overrides this.
941 *** New custom variable 'package-selected-packages' tracks packages
942 which were installed by the user (as opposed to installed as
943 dependencies). This variable can also be manually customized.
946 *** New command 'package-install-selected-packages' installs all
947 packages from 'package-selected-packages' which are currently missing.
950 *** 'package-install' function now takes a DONT-SELECT argument. If
951 this function is called interactively or if DONT-SELECT is nil, add the
952 package being installed to 'package-selected-packages'.
955 *** New command 'package-autoremove' removes all packages which were
956 installed strictly as dependencies but are no longer needed.
961 When you invoke 'shell' interactively, the *shell* buffer will now
962 display in a new window. However, you can customize this behavior via
963 the 'display-buffer-alist' variable. For example, to get
964 the old behavior -- *shell* buffer displays in current window -- use
965 (add-to-list 'display-buffer-alist
966 '("^\\*shell\\*$" . (display-buffer-same-window))).
970 *** The ':protection' slot option is not obeyed any more.
972 *** The 'newname' argument to constructors is optional&deprecated.
973 If you need your objects to be named, do it by inheriting from 'eieio-named'.
975 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
977 *** The <class> variables are declared obsolete.
979 *** The <initarg> variables are declared obsolete.
981 *** defgeneric and defmethod are declared obsolete.
982 Use the equivalent facilities from cl-generic.el instead.
984 *** 'constructor' is now an obsolete alias for 'make-instance'.
985 --- 'pcase' accepts a new UPattern 'eieio'.
990 *** New command 'ido-bury-buffer-at-head' bound to C-S-b
991 Bury the buffer at the head of 'ido-matches', analogous to how C-k
992 kills the buffer at head.
995 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
996 meaning, and the list is restricted to those elements that do not
997 match the current input.
1002 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
1003 The new commands 'next-line-or-history-element' and
1004 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
1005 minibuffer, allow by-line movement through minibuffer history,
1006 similarly to an ordinary buffer. Only when point moves over
1007 the bottom/top of the minibuffer it goes to the next/previous history
1008 element. 'M-p' and 'M-n' still move directly to previous/next history
1011 ** Search and Replace
1014 *** 'isearch' and 'query-replace' can now perform character folding in matches.
1015 This is analogous to case folding, but instead of disregarding case
1016 variants, it disregards wider classes of distinctions between similar
1017 characters. (Case folding is a special case of character folding.)
1018 This means many characters in the search string will match entire
1019 groups of characters instead of just themselves.
1021 For instance, the ASCII double quote character " will match all
1022 variants of double quotes, and the letter 'a' will match all of its
1023 accented cousins, even those composed of multiple characters, as well
1024 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
1027 Character folding is enabled by customizing 'search-default-mode' to
1028 the value 'character-fold-to-regexp'. You can also toggle character
1029 folding in the middle of a search by typing 'M-s ''.
1031 'query-replace' honors character folding if the new variable
1032 'replace-character-fold' is customized to a non-nil value.
1035 *** New user option 'search-default-mode'.
1036 This option specifies the default mode for Isearch. The default
1037 value, nil specifies that Isearch does literal searches (however,
1038 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
1039 as in previous Emacs versions).
1042 *** New function 'character-fold-to-regexp' can be used
1043 by searching commands to produce a regexp matching anything that
1044 character-folds into STRING.
1047 *** The new M-s M-w key binding uses eww to search the web for the
1048 text in the region. The search engine to use for this is specified by
1049 the customizable variable 'eww-search-prefix'.
1052 *** Query-replace history is enhanced.
1053 When query-replace reads the FROM string from the minibuffer, typing
1054 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
1055 and TO are the original text and its replacement, and SEP is an arrow
1056 string defined by the new variable 'query-replace-from-to-separator'.
1057 To select a prior replacement, type 'M-p' until the desired
1058 replacement appears in the minibuffer, and then exit the minibuffer by
1063 *** If 'quick-calc' is called with a prefix argument, insert the
1064 result of the calculation into the current buffer.
1067 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
1068 this you can tell Edebug not to stop at the start of the first
1069 instrumented function.
1074 *** New minor mode 'global-eldoc-mode'
1075 It is turned on by default, and affects '*scratch*' and other buffers
1076 whose major mode supports Emacs Lisp.
1079 *** 'eldoc-documentation-function' now defaults to 'ignore'
1082 *** 'describe-char-eldoc' displays information about character at point,
1083 and can be used as a default value of 'eldoc-documentation-function'. It is
1084 useful when, for example, one needs to distinguish various spaces - e.g.,
1085 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
1086 using mono-spaced font.
1091 *** HTML can now be rendered using variable-width fonts.
1094 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
1095 whether to use variable-pitch fonts or not. The user can also
1096 customize the 'shr-use-fonts' variable.
1099 *** A new command 'R' ('eww-readable') will try do identify the main
1100 textual parts of a web page and display only that, leaving menus and
1101 the like off the page.
1104 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
1105 toggle the paragraph direction between left-to-right and right-to-left.
1108 *** You can now use several eww buffers in parallel by renaming eww
1109 buffers you want to keep separate.
1112 *** Partial state of the eww buffers (the URIs and the titles of the
1113 pages visited) is now preserved in the desktop file.
1116 *** 'eww-after-render-hook' is now called after eww has rendered
1117 the data in the buffer.
1120 *** The 'eww-reload' command now takes a prefix to not reload via
1121 the net, but just use the local copy of the HTML.
1124 *** The DOM shr and eww uses has been changed to the general Emacs
1125 xml.el/libxml2 DOM, and a new package dom.el has been added to
1126 interact with this DOM. See the Emacs Lisp manual for interface
1130 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
1133 *** The new 'S' command will list all eww buffers, and allow managing
1137 *** https pages with valid certificates have headers marked in green, while
1138 invalid certificates are marked in red.
1143 *** text/html messages that contain inline image parts will be
1144 transformed into multipart/related messages before sending.
1147 ** In Show Paren Mode, a parenthesis can be highlighted when point
1148 stands inside it, and certain parens can be highlighted when point is
1149 at BOL or EOL, or in whitespace there. To enable these, customize,
1150 respectively, 'show-paren-when-point-inside-paren' or
1151 'show-paren-when-point-in-periphery'.
1154 ** If gpg2 exists on the system, it is now used as the default value
1155 of 'epg-gpg-program' (instead of gpg).
1160 *** Strings after ':documentation' are highlighted as docstrings.
1161 This enhances Lisp mode fontification to handle documentation of the
1162 form '(:documentation "the doc string")' used in Common Lisp code for
1163 CLOS class and slot documentation.
1165 ** Rectangle editing
1168 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
1171 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
1172 *** 'string-rectangle' provides on-the-fly preview of the result.
1175 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
1176 These should be used in preference to 'font-lock-fontify-buffer' when
1180 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
1181 to 'minibuffer-setup-hook'.
1183 If the first argument of the macro is of the form '(:append FUN)',
1184 then FUN will be appended to 'minibuffer-setup-hook', instead of
1189 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
1192 *** 'pcase' accepts the new UPattern 'cl-struct'.
1194 ** Calendar and diary
1197 *** The default 'diary-file' is now located in .emacs.d.
1200 *** New commands to insert diary entries with Chinese dates:
1201 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
1202 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
1205 *** The calendar can now list and mark diary entries with Chinese dates.
1206 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
1209 *** The option 'calendar-mode-line-format' can now be nil,
1210 which means to do nothing special with the mode line in calendars.
1213 *** New option 'calendar-weekend-days'.
1214 The option customizes which day headers receive the
1215 'calendar-weekend-header' face.
1218 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
1221 *** Many items obsolete since at least version 23.1 have been removed.
1222 The majority were function/variable/face aliases, too numerous to list here.
1225 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
1226 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
1228 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
1230 **** Macro 'calendar-for-loop'.
1232 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
1234 **** The nil and list forms of 'diary-display-function'.
1237 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
1238 If the output of ERT tests in batch mode execution can be saved to a
1239 log file, then it can be passed as an argument to the above function
1240 to produce a neat summary.
1243 ** New js.el option 'js-indent-first-init'.
1248 ** Info mode now displays symbol names in fixed-pitch font.
1249 If you want to get the old behavior back, customize the 'Info-quoted'
1250 face to use the same definitions as the default face.
1253 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
1256 *** 'info-display-manual' can now be given a prefix argument which (any
1257 non-nil value) directs the command to limit the completion
1258 alternatives to currently visited manuals.
1261 ** ntlm.el has support for NTLM2.
1266 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
1267 to delete or undelete multiple messages.
1270 *** Rmail can now render HTML mail messages if your Emacs was built with
1271 libxml2 or if you have the Lynx browser installed. By default, Rmail
1272 will display the HTML version of a mail message that has both HTML and
1273 plain text parts, if display of HTML email is possible; customize the
1274 'rmail-mime-prefer-html' option to 'nil' if you don't want that.
1277 *** In the commands that make summaries by subject, recipients, or senders,
1278 you can no longer use commas to separate regular expressions.
1281 ** SES now supports local printer functions; see 'ses-define-local-printer'.
1283 ** Shell-script Mode
1285 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
1286 specify the type of shell in use (bash, csh, etc).
1289 *** New value 'always' for 'sh-indent-after-continuation'.
1290 This provides old-style ("dumb") indentation of continued lines.
1291 See the doc string of 'sh-indent-after-continuation' for details.
1295 *** Fatal TLS errors are now silent by default.
1298 *** If Emacs isn't built with TLS support, an external TLS-capable
1299 program is used instead. This program used to be run in --insecure
1300 mode by default, but has now changed to be secure instead, and will
1301 fail if you try to connect to non-verifiable hosts. This is
1302 controlled by the 'tls-program' variable.
1307 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1308 When 'url-handler-mode' is enabled, file operations for these
1309 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1312 *** The URL package allows customizing the 'url-user-agent' string.
1313 The new 'url-user-agent' variable can be customized to be a string or
1317 *** The new interface variable 'url-request-noninteractive' can be used
1318 to specify that we're running in a noninteractive context, and that
1319 we should not be queried about things like TLS certificate validity.
1322 *** 'url-mime-accept-string' can now be used as in "interface"
1323 variable, meaning you can bind it around an 'url-retrieve' call.
1326 *** If URL is used with a https connection, the first callback argument
1327 plist will contain a :peer element that has the output of
1328 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
1333 *** New connection method "afp", which allows you to access Mac OS X
1334 volumes via the Apple Filing Protocol.
1337 *** New connection method "nc", which allows you to access dumb
1341 *** Method-specific parameters can be overwritten now with variable
1342 'tramp-connection-properties'.
1345 *** Handler for 'file-notify-valid-p' for remote machines that support
1346 filesystem notifications.
1351 *** New user variable 'sql-default-directory' enables remote
1352 connections using Tramp.
1355 *** New command 'sql-send-line-and-next'.
1356 This command, bound to 'C-c C-n' by default, sends the current line to
1357 the SQL process and advances to the next line, skipping whitespace and
1361 *** Added support for Vertica SQL.
1363 ** VC and related modes
1366 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
1367 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1368 (undocumented) command vc-hg-push now behaves slightly differently.
1371 *** The new command vc-region-history shows the log+diff of the active region.
1374 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
1375 This command is useful when you perform version control commands
1376 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1377 back-end for the buffer's file, or remove it from version control.
1380 *** New option 'vc-annotate-background-mode' controls whether
1381 the color range from 'vc-annotate-color-map' is applied to the
1382 background or to the foreground.
1385 *** New options for customizing encoding of Git commit log messages.
1386 The new options `vc-git-commits-coding-system' and
1387 `vc-git-log-output-coding-system' allow to customize the encoding of
1388 the log messages sent to Git when committing, and the decoding of the
1389 log messages read from Git history commands. Both default to UTF-8;
1390 if you customize them, make sure they are consistent with the Git
1391 config variables i18n.commitEncoding and i18n.logOutputEncoding.
1392 (`vc-git-commits-coding-system' existed previously, but was a
1393 variable, not a user option.)
1396 *** 'compare-windows' now compares text with the most recently selected window
1397 instead of the next window. If you want the previous behavior of
1398 comparing with the next window, customize the new option
1399 'compare-windows-get-window-function' to the value
1400 'compare-windows-get-next-window'.
1403 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
1404 replace the face 'compare-windows', which is now an obsolete alias for
1405 'compare-windows-added'.
1408 *** The VC state indicator in the mode line now has different faces
1409 corresponding to each of the possible states. See the 'vc-faces'
1410 customization group.
1413 *** 'log-edit-insert-changelog' converts "(tiny change)" to
1414 "Copyright-paperwork-exempt: yes". Set 'log-edit-rewrite-tiny-change'
1415 nil to disable this.
1418 ** VHDL mode now supports VHDL'08.
1423 *** Decimal display mode uses "," groups, so it's more
1424 fitting for use in money calculations
1427 *** Factorial works with non-integer inputs.
1432 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1433 macro argument expansion, interactive macro evaluation and automatic
1434 scanning of #define'd symbols.
1437 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
1438 result of evaluating a macro.
1441 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
1442 all defined symbols in 'hide-ifdef-env'.
1445 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
1446 file name patterns. Defaults to files whose extension is one of '.h',
1447 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
1450 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
1451 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1452 (This could happen when an idempotent header file is visited again,
1453 when its guard symbol is already defined.) Defaults to 't'.
1456 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
1457 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1458 looking for macro definitions. By default, no symbols are ignored.
1463 *** New custom variable 'tex-print-file-extension' to help users who
1464 use PDF instead of DVI.
1467 *** TeX mode now supports Prettify Symbols mode. When enabling
1468 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1469 many other math macros are displayed using unicode characters.
1472 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
1473 By default, 32 consecutive spaces or four consecutive TABs are
1474 considered to be too deep, but the new variable
1475 'whitespace-big-indent-regexp' can be customized to change that.
1478 ** New options in 'tildify-mode'.
1479 New options 'tildify-space-string', 'tildify-pattern', and
1480 'tildify-foreach-region-function' variables make
1481 'tildify-string-alist', 'tildify-pattern-alist', and
1482 'tildify-ignored-environments-alist' variables (as well as a few
1483 helper functions) obsolete.
1486 ** New package Xref replaces Etags's front-end and UI
1488 The new package Xref provides a generic framework and new commands to
1489 find and move to definitions of functions, macros, data structures
1490 etc., as well as go back to the location where you were before moving
1491 to a definition. It supersedes and obsoletes many Etags commands,
1492 while still using the etags.el code that reads the TAGS tables as one
1495 The command 'xref-find-definitions' replaces 'find-tag' and provides
1496 an interface to pick one definition among several.
1497 'tags-loop-continue' is now unbound. 'xref-pop-marker-stack' replaces
1498 'pop-tag-mark', but has a keybinding ('M-,') different from the one
1499 'pop-tag-mark' used.
1501 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
1502 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
1503 'xref-find-apropos' replaces 'find-tag-regexp'.
1505 As a result of this, the following commands are now obsolete:
1506 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
1509 'tags-loop-continue' is not obsolete because it's still useful in
1510 'tags-search' and 'tags-query-replace', for which there are no direct
1514 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
1515 replaced by xref-style commands, see the "Dired" section below.
1520 'find-tag-marker-ring-length' is now an obsolete alias for
1521 'xref-marker-ring-length'. 'find-tag-marker-ring' is now an obsolete
1522 alias for a private variable. 'xref-push-marker-stack' and
1523 'xref-pop-marker-stack' should be used instead to manipulate the stack
1524 of searches for definitions.
1527 *** 'xref-find-definitions' and 'describe-function' now display
1528 information about mode local overrides (defined by cedet/mode-local.el
1529 'define-overloadable-function' 'define-mode-local-overrides').
1531 The framework's Lisp API is still experimental and can change in major,
1532 backward-incompatible ways.
1535 ** New package Project
1537 The new package Project provides generic infrastructure for dealing
1538 with projects. The main commands included in it are
1539 'project-find-file' and 'project-find-regexp'.
1541 The Lisp API of this package is still experimental.
1544 EUDC's LDAP backend has been improved.
1547 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1550 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1551 subprocess instead of on the command line.
1554 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1555 need to configure this manually anymore.
1558 *** The LDAP configuration section of EUDC's manual has been
1561 There have also been customization changes.
1564 *** New custom variable 'eudc-server-hotlist' to allow specifying
1565 multiple EUDC servers in init file.
1568 *** Custom variable 'eudc-inline-query-format' defaults to completing
1569 on email and firstname instead of surname.
1572 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
1573 to avoid interfering with the kill ring.
1576 *** Custom variable 'eudc-inline-expansion-format' defaults to
1577 "Firstname Surname <mail-address>".
1580 *** Custom variable 'eudc-options-file' defaults to
1581 "~/.emacs.d/eudc-options".
1584 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
1585 allow overriding the regular expression that recognizes the ldapsearch
1586 command line's password prompt.
1589 EUDC's BBDB backend now supports BBDB 3.
1592 EUDC's PH backend (eudcb-ph.el) is obsolete.
1597 *** The new built-in command 'clear' can scroll window contents out of sight.
1598 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1601 *** New buffer syntax '#<buffer-name>', which is equivalent to
1602 '#<buffer buffer-name>'. This shorthand makes interacting with
1603 buffers from eshell more convenient. Custom variable
1604 'eshell-buffer-shorthand', which has been broken for a while, has been
1608 *** By default, eshell "visual" program buffers (created by
1609 'eshell-visual-commands' and similar custom vars) are no longer killed
1610 when their processes die. This fixes issues with short-lived commands
1611 and makes visual programs more useful in general. For example, if
1612 "git log" is a visual command, it will always show the visual command
1613 buffer, even if the "git log" process dies. For the old behavior,
1614 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
1619 *** Support for the Google Chrome web browser.
1622 *** Support for the Conkeror web browser.
1625 *** Support for several ancient browsers is now officially obsolete.
1628 ** tar-mode: new 'tar-new-entry' command, allowing for new members to
1629 be added to the archive.
1634 *** Dired buffers are also auto-reverted via file notifications, if
1635 Emacs is compiled with file notification support.
1638 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
1639 See <http://debbugs.gnu.org/22814>.
1641 ** File Notifications
1644 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1647 *** The new event 'stopped' signals, that a file notification watch is
1648 not active any longer.
1651 *** The new function 'file-notify-valid-p' checks, whether a file
1652 notification descriptor still corresponds to an activate watch.
1657 *** The command 'dired-do-compress' bound to 'Z' now can compress
1658 directories and decompress zip files.
1661 *** New command 'dired-do-compress-to' bound to 'c' can be used to
1662 compress many marked files into a single named archive. The
1663 compression command is determined from the new
1664 'dired-compress-files-alist' variable.
1667 *** New user interface for the 'A' and 'Q' commands.
1668 These keys, now bound to 'dired-do-find-regexp' and
1669 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
1670 and 'xref-query-replace-in-results': they present the matches
1671 in the '*xref*' buffer and let you move through the matches. No need
1672 to use 'tags-loop-continue' to resume the search or replace loop. The
1673 previous commands, 'dired-do-search' and
1674 'dired-do-query-replace-regexp', are still available, but not bound to
1675 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
1676 back. We intend to obsolete the old commands in a future release.
1678 ** Tabulated List Mode
1681 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
1682 call 'tabulated-list-init-header', in which case it will have no
1686 *** 'tabulated-list-print' takes a second optional argument, update,
1687 which specifies an alternative printing method which is faster when
1688 few or no entries have changed.
1690 ** Obsolete packages
1696 *** landmark.el (moved to elpa.gnu.org)
1699 * New Modes and Packages in Emacs 25.1
1702 ** pinentry.el allows GnuPG passphrase to be prompted through the
1703 minibuffer instead of a graphical dialog, depending on whether the gpg
1704 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1705 is set). This feature requires newer versions of GnuPG (2.1.5 or
1706 later) and Pinentry (0.9.5 or later). To use this feature, add
1707 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1708 configuration with "gpgconf --reload gpg-agent".
1711 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1712 The main entry points are 'cl-defgeneric' and 'cl-defmethod'. See the
1713 node "Generic Functions" in the Emacs Lisp manual for more details.
1716 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1717 SCSS (Sassy CSS) files.
1720 ** let-alist is a new macro (and a package) that allows one to easily
1721 let-bind the values stored in an alist.
1724 ** 'tildify-mode' allows automatic insertion of hard spaces as one
1725 types the text. Breaking line after a single-character words is
1726 forbidden by Czech and Polish typography (and may be discouraged in
1727 other languages), so 'auto-tildify-mode' makes it easier to create
1728 a typographically-correct documents.
1731 ** The 'seq' library adds sequence manipulation functions and macros
1732 that complement basic functions provided by subr.el. All functions
1733 are prefixed with 'seq-' and work on lists, strings and vectors.
1734 'pcase' accepts a new Upattern 'seq'.
1737 ** The 'map' library provides map-manipulation functions that work on
1738 alists, hash-table and arrays. All functions are prefixed with
1739 'map-'. 'pcase' accepts a new UPattern 'map'.
1742 ** The 'thunk' library provides functions and macros to control the
1743 evaluation of forms.
1746 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1747 support for JSX, an XML-like syntax extension to ECMAScript.
1750 * Incompatible Lisp Changes in Emacs 25.1
1753 ** 'setq' and 'setf' must now be called with an even number of
1754 arguments. The earlier behavior of silently supplying a nil to the
1755 last variable when there was an odd number of arguments has been
1759 ** 'syntax-begin-function' is declared obsolete.
1760 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1761 slot in font-lock-defaults.
1764 ** The new implementation of Subword mode affects word movement everywhere.
1765 When Subword mode is turned on, 'forward-word', 'backward-word', and
1766 everything that uses them will move by sub-words, effectively
1767 overriding the buffer's syntax table. Lisp programs that shouldn't be
1768 affected by Subword mode should call the new functions
1769 'forward-word-strictly' and 'backward-word-strictly' instead.
1772 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
1773 called during startup. Users who call this function in their init
1774 file and still expect it to be run after startup should set
1775 'package-enable-at-startup' to t after the call to
1776 'package-initialize'.
1779 ** ':global' minor mode use 'setq-default' rather than 'setq'.
1780 This means that you can't use 'make-local-variable' and expect them to
1781 "magically" become buffer-local.
1784 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
1785 The 'track-mouse' form no longer refrains from changing the shape of
1786 the mouse pointer for the entire time the body of that form is
1787 executed. Lisp programs that use 'track-mouse' for dragging across
1788 large portions of the Emacs display, and want to avoid changes in the
1789 pointer shape during dragging, should bind the variable 'track-mouse'
1790 to the special value 'dragging' in the body of the form.
1793 ** The optional 'predicate' argument of 'lisp-complete-symbol' no longer
1794 has any effect. (This change was made in Emacs 24.4 but was not
1795 advertised at the time.)
1798 ** 'indirect-function' does not signal 'void-function' any more.
1799 This is mostly a bug-fix, since this change was missed back in 24.4 when
1800 symbol-function was changed not to signal 'void-function' any more.
1803 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
1806 ** M-x shell and M-x compile no longer set the EMACS environment variable.
1807 This avoids clashing when other programs use the variable for other purposes.
1808 Although M-x term still sets EMACS for compatibility with Bash 4.3 and earlier,
1809 this is deprecated and will be phased out when Bash 4.4 or later takes over.
1810 Use the INSIDE_EMACS environment variable instead.
1813 ** 'save-excursion' does not save&restore the mark any more.
1814 Use 'save-mark-and-excursion' if you want the old behavior.
1817 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
1818 argument ('predicate').
1821 ** 'completion-table-dynamic' by default stays in the minibuffer.
1822 The minibuffer will be the current buffer when the function is called.
1823 If you want the old behavior of calling the function in the buffer
1824 from which the minibuffer was entered, use the new argument
1825 'switch-buffer' to 'completion-table-dynamic'.
1828 ** window-configurations no longer record the buffers' marks.
1831 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1832 active region handling.
1835 ** deactivate-mark is now buffer-local.
1838 ** 'cl-the' now asserts that its argument is of the given type.
1841 ** 'process-running-child-p' may now return a numeric process
1842 group ID instead of 't'.
1845 ** Mouse click events on mode line or header line no longer include
1846 any reference to a buffer position. The 6th member of the mouse
1847 position list returned for such events is now nil.
1850 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1851 These slots used to hold key-shortcut data, but have been obsolete since
1855 ** Emacs no longer downcases the first letter of a system diagnostic
1856 when signaling a file error. For example, it now reports "Permission
1857 denied" instead of "permission denied". The old behavior was problematic
1858 in languages like German where downcasing rules depend on grammar.
1861 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
1862 Set it to 'curve' for curved single quotes, to 'straight' for straight
1863 apostrophes, and to 'grave' for grave accent and apostrophe. The
1864 default value nil acts like 'curve' if curved single quotes are
1865 displayable, and like 'grave' otherwise. The new variable affects
1866 display of diagnostics and help, but not of info.
1869 ** substitute-command-keys now replaces quotes.
1870 That is, it converts documentation strings' quoting style as per the
1871 value of 'text-quoting-style'. Doc strings in source code can use
1872 either curved single quotes or grave accents and apostrophes. As
1873 before, characters preceded by \= are output as-is.
1876 ** Message-issuing functions 'error', 'message', etc. now convert quotes.
1877 They use the new 'format-message' function instead of plain 'format',
1878 so that they now follow user preference as per 'text-quoting-style'
1879 when processing curved single quotes, grave accents, and apostrophes
1880 in their format argument.
1883 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1884 now match multibyte characters using Unicode character properties.
1885 If you want the old behavior where they matched any character with
1886 word syntax, use '\sw' instead.
1889 ** The character classes [:graph:] and [:print:] in regular expressions
1890 no longer match every multibyte character. Instead, Emacs now
1891 consults the Unicode character properties to determine which
1892 characters are graphic or printable. In particular, surrogates and
1893 unassigned codepoints are now rejected. If you want the old behavior,
1894 use [:multibyte:] instead.
1897 ** The 'diff' command uses the unified format now. To restore the old
1898 behavior, set 'diff-switches' to '-c'.
1901 ** 'grep-template' and 'grep-find-template' values don't include the
1902 --color argument anymore. It's added at the <C> place holder position
1903 dynamically. Any third-party code that changes these templates should
1904 be updated accordingly.
1907 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
1908 The new behavior is compatible with Common Lisp and with XEmacs.
1909 This change does not affect Lisp code intended to be portable to
1910 Emacs 24.2 and earlier, which did not support unary '/'.
1913 ** The 'default-directory' value doesn't have to end slash. To make
1914 that happen, 'unhandled-file-name-directory' now defaults to calling
1915 'file-name-as-directory'.
1918 * Lisp Changes in Emacs 25.1
1922 *** New UPatterns 'quote', 'app'.
1924 *** New UPatterns can be defined with 'pcase-defmacro'.
1926 *** New vector QPattern.
1929 ** syntax-propertize is now automatically called on-demand during forward
1930 parsing functions like 'forward-sexp'.
1933 ** New hooks 'prefix-command-echo-keystrokes-functions' and
1934 'prefix-command-preserve-state-hook' allow the definition of prefix
1935 commands other than the predefined 'C-u'.
1938 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
1939 These allow conversion between buffer positions and the corresponding
1940 file byte offsets, given the file's encoding.
1943 ** The default value of 'load-read-function' is now 'read'.
1944 Previously, the default value of 'nil' implied using 'read'.
1947 ** New hook 'pre-redisplay-functions'.
1948 It is a bit easier to use than 'pre-redisplay-function'.
1951 ** The second arg of 'looking-back' should always be provided explicitly.
1952 Previously, it was an optional argument, now it's mandatory.
1955 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
1956 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
1957 implemented by the new 'cursor-intangible-mode' and
1958 'cursor-sensor-mode' minor modes.
1961 ** 'inhibit-point-motion-hooks' now defaults to 't' and is obsolete.
1962 Use the new minor modes 'cursor-intangible-mode' and
1963 'cursor-sensor-mode' instead.
1966 ** New process type 'pipe', which can be used in combination with the
1967 ':stderr' keyword of make-process to handle standard error output
1971 ** New function 'make-process' provides an alternative interface to
1972 'start-process'. It allows programs to set process parameters such as
1973 process filter, sentinel, etc., through keyword arguments (similar to
1974 'make-network-process').
1977 ** A new function 'directory-files-recursively' returns all matching
1978 files (recursively) under a directory.
1981 ** New variable 'inhibit-message', when bound to non-nil, inhibits
1982 'message' and related functions from displaying messages in the echo
1983 area. The output is still logged to the *Messages* buffer.
1986 ** A new text property 'inhibit-read-only' can be used in read-only
1987 buffers to allow certain parts of the text to be writable.
1990 ** A new variable 'comment-end-can-be-escaped' is useful in languages
1991 such as C and C++ where line comments with escaped newlines are
1992 continued to the next line.
1995 ** New macro 'define-advice'.
1998 ** Emacs Lisp now supports generators.
1999 See the "Generators" section of the ELisp manual for the details.
2002 ** New finalizer facility for running code when objects become unreachable.
2003 See the "Finalizer Type" subsection in the ELisp manual for the
2007 ** lexical closures can use (:documentation FORM) to build their docstring.
2008 It should be placed right where the docstring would be, and FORM is then
2009 evaluated (and should return a string) when the closure is built.
2012 ** define-inline provides a new way to define inlinable functions.
2015 ** New function 'macroexpand-1' to perform a single step of macro expansion.
2018 ** Some "x-*" functions were obsoleted and/or renamed:
2019 *** x-select-text is renamed gui-select-text.
2020 *** x-selection-value is renamed gui-selection-value.
2021 *** x-get-selection is renamed gui-get-selection.
2022 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
2023 *** x-get-selection-value is renamed to gui-get-primary-selection.
2024 *** x-set-selection is renamed to gui-set-selection
2027 ** New function 'string-greaterp', which return the opposite result of
2031 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
2032 preserve the collation order as defined by the system's locale(1)
2033 environment. For the time being this is implemented for modern POSIX
2034 systems and for MS-Windows, for other systems they fall back to their
2035 counterparts 'string-lessp' and 'string-equal'.
2038 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
2039 The effect is that, on systems that use ls-lisp for Dired, the default
2040 sort order of the files in Dired is now different from what it was in
2041 previous versions of Emacs. In particular, the file names are sorted
2042 disregarding punctuation, accents, and diacritics, and letter case is
2043 ignored. For example, files whose name begin with a period will no
2044 longer appear near the beginning of the directory listing. If you
2045 want the old, locale-independent sorting, customize the new option
2046 'ls-lisp-use-string-collate' to the nil value.
2049 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
2050 if set to a non-nil value, causes the above 2 functions to ignore
2051 symbol and punctuation characters when collating strings. This
2052 emulates the behavior of modern Posix platforms when the locale's
2053 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
2054 MS-Windows doesn't support UTF-8 as codeset in its locales.
2057 ** New function 'alist-get', which is also a valid place (aka lvalue).
2060 ** New function 'funcall-interactively', which works like 'funcall'
2061 but makes 'called-interactively-p' treat the function as (you guessed it)
2062 called interactively.
2065 ** New function 'function-put' to use instead of 'put' for function properties.
2068 ** The new function 'bidi-find-overridden-directionality' allows you to
2069 find characters whose directionality was, perhaps maliciously,
2070 overridden by directional override control characters. Lisp programs
2071 can use this to detect potential phishing of URLs and other links that
2072 exploits bidirectional display reordering.
2075 ** The new function 'buffer-substring-with-bidi-context' allows you to
2076 copy a portion of a buffer into a different location while preserving
2077 the visual appearance both of the copied text and the text at
2078 destination, even when the copied text includes mixed bidirectional
2079 text and directional control characters.
2082 ** New properties that can be specified with 'declare':
2083 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
2084 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
2085 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
2089 ** New macro 'with-file-modes', for evaluating expressions with default file
2090 permissions set to temporary values (e.g., for creating private files).
2093 ** You can access the slots of structures using 'cl-struct-slot-value'.
2096 ** Function 'sort' can deal with vectors.
2099 ** Function 'system-name' now returns an updated value if the current
2100 system's name has changed or if the Emacs process has changed systems,
2101 and to avoid long waits it no longer consults DNS to canonicalize the
2102 name. The variable 'system-name' is now obsolete.
2105 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
2108 ** If 'pwd' is called with a prefix argument, insert the current default
2112 ** New functions return extended information about fonts and faces.
2115 *** The function 'font-info' now returns more details about a font.
2116 In particular, it now returns the average width of the font's
2117 characters, which can be used for geometry-related calculations.
2120 *** A new function 'default-font-width' returns the average width of a
2121 character in the current buffer's default font. If the default face
2122 is remapped (see 'face-remapping-alist'), the value for the remapped
2123 face is returned. This function complements the existing function
2124 'default-font-height'.
2127 *** New functions 'window-font-height' and 'window-font-width' return
2128 the height and average width of characters in a specified face and
2129 window. If FACE is remapped (see 'face-remapping-alist'), the
2130 function returns the information for the remapped face.
2133 *** A new function 'window-max-chars-per-line' returns the maximal
2134 number of characters that can be displayed on one line. If a face
2135 and/or window are provided, these values are used for the
2136 calculation. This function is different from 'window-body-width' in
2137 that it accounts for (i) continuation glyphs, (ii) the size of the
2138 font, and (iii) the specified window.
2141 ** New utilities in subr-x.el:
2142 *** New macros 'if-let' and 'when-let' allow defining bindings and to
2143 execute code depending whether all values are true.
2144 *** New macros 'thread-first' and 'thread-last' allow threading a form
2145 as the first or last argument of subsequent forms.
2148 ** Documentation strings now support quoting with curved single quotes
2149 in addition to the old style with grave accent and apostrophe. The
2150 new style looks better on today's displays. In the new Electric Quote
2151 mode, you can enter curved single quotes into documentation by typing
2152 grave accent and apostrophe. Outside Electric Quote mode, you can
2153 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
2154 works) by typing 'A-[' and 'A-]'. As described above under
2155 'text-quoting-style', the user can specify how to display doc string
2159 ** New function 'format-message' is like 'format' and also converts
2160 curved single quotes, grave accents and apostrophes as per
2161 'text-quoting-style'.
2164 ** show-help-function's arg is converted via substitute-command-keys
2165 before being passed to the function. Help strings, help-echo
2166 properties, etc. can therefore contain command key escapes and
2170 ** Time-related changes:
2172 *** Time conversion functions now accept an optional ZONE argument
2173 that specifies the time zone rules for conversion. ZONE is omitted or
2174 nil for Emacs local time, t for Universal Time, 'wall' for system wall
2175 clock time, or a string as in the TZ environment variable. The
2176 affected functions are 'current-time-string', 'current-time-zone',
2177 'decode-time', and 'format-time-string'. The function 'encode-time',
2178 which already accepted a simple time zone rule argument, has been
2179 extended to accept all the new forms.
2181 *** Incompatible change in the third argument of 'format-time-string'.
2182 Previously, any non-nil argument was interpreted as specifying Universal Time.
2183 This is no longer true; packages that want Universal Time should pass t
2184 as the third argument.
2186 *** Time-related functions now consistently accept numbers
2187 (representing seconds since the epoch) and nil (representing the
2188 current time) as well as the usual list-of-integer representation.
2189 Affected functions include 'current-time-string', 'current-time-zone',
2190 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
2191 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
2192 'time-to-days', and 'time-to-seconds'.
2194 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
2197 *** 'calendar-next-time-zone-transition', 'time-add', and
2198 'time-subtract' no longer return time values in the obsolete and
2199 undocumented integer-pair format. Instead, they return a list of two
2203 ** New function 'set-binary-mode' allows switching a standard stream
2204 of the Emacs process to binary I/O mode.
2207 ** The new function 'directory-name-p' can be used to check whether a file
2208 name (as returned from, for instance, 'file-name-all-completions') is
2209 a directory file name. It returns non-nil if the last character in
2210 the name is a directory separator character (forward slash on GNU and
2211 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2214 ** ASCII approximations to curved quotes are put in standard-display-table
2215 if the terminal cannot display curved quotes.
2218 ** Standard output and error streams now transliterate characters via
2219 standard-display-table, and encode output using locale-coding-system.
2220 To force a specific encoding, bind 'coding-system-for-write' to the
2221 coding-system of your choice when invoking functions like 'prin1' and
2225 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
2228 ** New possible value for 'system-type': 'nacl'.
2229 This is used by Google's Native Client (NaCl).
2231 ** Miscellaneous name change
2234 For consistency with the usual Emacs spelling, the Lisp variable
2235 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
2236 The old name should still work, as an obsolescent alias.
2238 ** Changes in Frame- and Window- Handling
2241 *** Emacs can now draw horizontal scroll bars on some platforms that
2242 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2243 Horizontal scroll bars are turned off by default.
2245 **** New function 'horizontal-scroll-bars-available-p' telling whether
2246 horizontal scroll bars are available on the underlying system.
2248 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
2249 bars on all existing and future frames.
2251 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
2252 scroll bars on the selected frame.
2254 **** New frame parameters 'horizontal-scroll-bars' and
2255 'scroll-bar-height' to set horizontal scroll bars and their height
2256 for individual frames and in 'default-frame-alist'.
2258 **** New functions 'frame-scroll-bar-height' and
2259 'window-scroll-bar-height' return the height of horizontal scroll
2260 bars on a specific frame or window.
2262 **** 'set-window-scroll-bars' now accepts five parameters where the last
2263 two specify height and type of the window's horizontal scroll bar.
2265 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
2268 **** New buffer-local variables 'horizontal-scroll-bar' and
2269 'scroll-bar-height'.
2272 *** New functions 'frame-geometry' and 'frame-edges' give access to a
2276 *** New functions 'mouse-absolute-pixel-position' and
2277 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
2281 *** The function 'window-edges' now accepts three additional arguments to
2282 retrieve body, absolute and pixel edges of the window.
2285 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
2286 'window-inside-absolute-pixel-edges' have been renamed to respectively
2287 'window-body-edges', 'window-body-pixel-edges' and
2288 'window-absolute-body-pixel-edges'. The old names are kept as aliases.
2291 *** New function 'window-absolute-pixel-position' to get the screen
2292 coordinates of a visible buffer position.
2295 *** The height of a frame's menu and tool bar are no longer counted in the
2296 frame's text height. This means that the text height stands only for
2297 the height of the frame's root window plus that of the echo area (if
2298 present). This was already the behavior for frames with external tool
2299 and menu bars (like in the Gtk builds) but has now been extended to all
2303 *** Frames now do not necessarily preserve the number of columns or lines
2304 they display when setting default font, menu bar, fringe width, or
2305 scroll bars. In particular, maximized and fullscreen frames are
2306 conceptually never resized if such settings change. For fullheight and
2307 fullwidth frames, the behavior may depend on the toolkit used.
2308 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
2309 setting default font, menu bar, fringe width, or scroll bars of a
2310 specific frame does not resize that frame in order to preserve the
2311 number of columns or lines it displays.
2314 *** New function 'window-preserve-size' allows you to preserve the size of
2315 a window without "fixing" it. It's supported by 'fit-window-to-buffer',
2316 'temp-buffer-resize-mode' and 'display-buffer'.
2319 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
2320 This displays the buffer in an existing frame other than the current
2321 frame, and allows the caller to specify a frame predicate to exclude
2325 *** New minor mode 'window-divider-mode' and options
2326 'window-divider-default-places', 'window-divider-default-bottom-width'
2327 and 'window-divider-default-right-width'.
2330 *** The window displaying the '*Completions*' buffer with minibuffer
2331 completion candidates is now shown at the bottom of the selected
2332 frame. The size of that window is always as large as required to
2333 display all the candidates, except when limited by the minimum size
2334 of the other windows on that frame; those other windows are resized
2335 to provide space for the '*Completions*' display. The Emacs manual
2336 describes how to customize 'display-buffer-alist' to get back the old
2337 behavior, see the node "Temporary Displays" there.
2340 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2341 Those features have been deprecated in Gtk+ for a long time.
2346 *** etags no longer qualifies class members by default.
2348 By default, 'etags' will not qualify class members for Perl and C-like
2349 object-oriented languages with their class names and namespaces, and
2350 will remove qualifications used explicitly in the code from the tag
2351 names it puts in TAGS files. This is so the etags.el back-end for
2352 'xref-find-definitions' is more accurate and produces less false
2355 Use --class-qualify (-Q) if you want the old default behavior of
2356 qualifying class members in C++, Java, Objective C, and Perl. Note
2357 that using -Q might make some class members become "unknown" to 'M-.'
2358 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
2359 qualified names by hand.
2362 *** New language Ruby
2364 Names of modules, classes, methods, functions, and constants are
2365 tagged. Overloaded operators are also tagged.
2369 Names of packages, functions, and types are tagged.
2372 *** Improved support for Lua
2374 Etags now tags functions even if the "function" keyword follows some
2375 whitespace at line beginning.
2378 * Changes in Emacs 25.1 on Non-Free Operating Systems
2381 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2382 This includes the makefile.w32-in files in various subdirectories, and
2383 the support files. The file nt/configure.bat now just tells the user
2384 to use the procedure described in nt/INSTALL, by running the Posix
2385 'configure' script in the top-level directory.
2388 ** Building Emacs for MS-Windows requires at least Windows XP
2389 or Windows Server 2003. The built binaries still run on all versions
2390 of Windows starting with Windows 9X.
2393 ** Emacs running on MS-Windows now supports the daemon mode.
2396 ** The byte counts in etags-generated TAGS files are now the same on
2397 MS-Windows as they are on other platforms.
2400 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2401 Pass '--without-ns' to configure to create an X11 build, the old default.
2404 ** OS X 10.5 or older is no longer supported.
2407 ** OS X on PowerPC is no longer supported.
2410 ** New variable 'ns-use-fullscreen-animation' controls animation for
2411 non-native NS fullscreen. The default is nil. Set to t to enable
2412 animation when entering and leaving fullscreen. For native OSX fullscreen
2416 ** The new function 'w32-application-type' returns the type of an
2417 MS-Windows application given the name of its executable program file.
2419 ** New variable 'w32-pipe-buffer-size'.
2420 It can be used to tune the size of the buffer of pipes created for
2421 communicating with subprocesses, when the program run by a subprocess
2422 exhibits unusual buffering behavior. Default is zero, which lets the
2423 OS use its default size.
2426 ----------------------------------------------------------------------
2427 This file is part of GNU Emacs.
2429 GNU Emacs is free software: you can redistribute it and/or modify
2430 it under the terms of the GNU General Public License as published by
2431 the Free Software Foundation, either version 3 of the License, or
2432 (at your option) any later version.
2434 GNU Emacs is distributed in the hope that it will be useful,
2435 but WITHOUT ANY WARRANTY; without even the implied warranty of
2436 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2437 GNU General Public License for more details.
2439 You should have received a copy of the GNU General Public License
2440 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2446 paragraph-separate: "[
\f]*$"