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 returns more information.
63 ** Several accessors for the value returned by 'file-attributes'
64 have 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' computes compute a fast, non-consing
74 hash of a buffer's contents.
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 support disabling 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 ** The new function 'read-multiple-choice' prompts for multiple-choice
139 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 to do
162 this is controlled by the 'wdired-create-parent-directories' variable.
165 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
166 viewing HTML files and the like.
171 *** A new 's' command for switching to another eww buffer via the minibuffer.
174 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
175 with the 'o' command from 'image-map'.
178 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
179 whether to use the HTML-specified colors or not. The user can also
180 customize the 'shr-use-colors' variable.
183 *** Images that are being loaded are now marked with gray
184 "placeholder" images of the size specified by the HTML. They are then
185 replaced by the real images asynchronously, which will also now
186 respect width/height HTML specs (unless they specify widths/heights
187 bigger than the current window).
192 *** Images are automatically scaled before displaying based on the
193 'image-scaling-factor' variable (if Emacs supports scaling the images
197 *** Images inserted with 'insert-image' and related functions get a
198 keymap put into the text properties (or overlays) that span the
199 image. This keymap binds keystrokes for manipulating size and
200 rotation, as well as saving the image to a file. These commands are
201 also available in 'image-mode'.
204 *** A new library for creating and manipulating SVG images has been
205 added. See the "SVG Images" section in the lispref manual for
209 *** New setf-able function to access and set image parameters is
210 provided: 'image-property'.
213 ** The commands that add ChangeLog entries now prefer a VCS root directory
214 for the ChangeLog file, if none already exists. Customize
215 'change-log-directory-files' to nil for the old behavior.
218 ** Support for non-string values of 'time-stamp-format' has been removed.
223 *** 'message-use-idna' now defaults to t (because Emacs comes with
224 built-in IDNA support now).
227 *** The 'message-valid-fqdn-regexp' variable has been removed, since
228 there are now top-level domains added all the time. Message will no
229 longer warn about sending emails to top-level domains it hasn't heard
232 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
233 In 'visual-line-mode' it will look for the true beginning of a header
234 while in non-'visual-line-mode' it will move the point to the indented
240 *** New connection method "sg", which supports editing files under a
244 *** New connection method "doas" for OpenBSD hosts.
247 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
252 *** Support for completing attribute values and bang-rules using the
253 'completion-at-point' command.
256 ** Emacs now supports character name escape sequences in character and
257 string literals. The syntax variants \N{character name} and
258 \N{U+code} are supported.
261 ** Prog mode has some support for multi-mode indentation.
262 This allows better indentation support in modes that support multiple
263 programming languages in the same buffer, like literate programming
264 environments or ANTLR programs with embedded Python code.
266 A major mode can provide indentation context for a sub-mode through
267 the 'prog-indentation-context' variable. To support this, modes that
268 provide indentation should use 'prog-widen' instead of 'widen' and
269 'prog-first-column' instead of a literal zero. See the node
270 "Mode-Specific Indent" in the ELisp manual for more details.
274 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
280 *** The new function 'url-cookie-delete-cookie' can be used to
281 programmatically delete all cookies, or cookies from a specific
284 *** The URL package now support HTTPS over proxies supporting CONNECT.
287 *** 'url-user-agent' now defaults to 'default', and the User-Agent
288 string is computed dynamically based on 'url-privacy-level'.
290 ** VC and related modes
293 *** The VC state indicator in the mode line now defaults to more
294 colorful faces to make it more obvious to the user what the state is.
295 See the 'vc-faces' customization group.
298 * New Modes and Packages in Emacs 25.2
301 * Incompatible Lisp Changes in Emacs 25.2
304 ** Resizing a frame no longer runs 'window-configuration-change-hook'.
305 Put your function on 'window-size-change-functions' instead.
307 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
308 mode to send the same escape sequences that xterm does. This makes
309 things like forward-word in readline work.
312 ** hideshow mode got four key bindings that are analogous to outline
313 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
315 ** The grep/rgrep/lgrep functions will now ask about saving files
316 before running. This is controlled by the 'grep-save-buffers'
320 * Lisp Changes in Emacs 25.2
322 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss.
324 ** Autoload files can be generated without timestamps,
325 by setting 'autoload-timestamps' to nil.
326 FIXME As an experiment, nil is the current default.
327 If no insurmountable problems before next release, it can stay that way.
329 ** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
333 ** 'gnutls-boot' now takes a parameter :complete-negotiation that says
334 that negotiation should complete even on non-blocking sockets.
337 ** New functions 'window-pixel-width-before-size-change' and
338 'window-pixel-height-before-size-change' support detecting which
339 window changed size when 'window-size-change-functions' are run.
342 ** New function 'display-buffer-reuse-mode-window' is an action function
343 suitable for use in 'display-buffer-alist'. For example, to avoid creating
344 a new window when opening man pages when there's already one, use
345 (add-to-list 'display-buffer-alist
346 '("\\`\\*Man .*\\*\\'" .
347 (display-buffer-reuse-mode-window
348 (inhibit-same-window . nil)
352 ** There is now a new variable 'flyspell-sort-corrections-function'
353 that allows changing the way corrections are sorted.
356 ** The new command 'fortune-message' has been added, which displays
357 fortunes in the echo area.
360 ** New function 'func-arity' returns information about the argument list
361 of an arbitrary function. This generalizes 'subr-arity' for functions
362 that are not built-in primitives. We recommend using this new
363 function instead of 'subr-arity'.
366 ** 'parse-partial-sexp' state has a new element. Element 10 is
367 non-nil when the last character scanned might be the first character
368 of a two character construct, i.e., a comment delimiter or escaped
369 character. Its value is the syntax of that last character.
372 ** 'parse-partial-sexp''s state, element 9, has now been confirmed as
373 permanent and documented, and may be used by Lisp programs. Its value
374 is a list of currently open parenthesis positions, starting with the
375 outermost parenthesis.
378 ** 'read-color' will now display the color names using the color itself
379 as the background color.
381 ** The function 'redirect-debugging-output' now works on platforms
382 other than GNU/Linux.
385 ** The new function 'string-version-lessp' compares strings by
386 interpreting consecutive runs of numerical characters as numbers, and
387 compares their numerical values. According to this predicate,
388 "foo2.png" is smaller than "foo12.png".
391 ** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
392 Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
393 two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
394 ('sxhash-eql') on them will be the same.
397 ** Function 'sxhash' has been renamed to 'sxhash-equal' for
398 consistency with the new functions. For compatibility, 'sxhash'
399 remains as an alias to 'sxhash-equal'.
402 ** Time conversion functions that accept a time zone rule argument now
403 allow it to be OFFSET or a list (OFFSET ABBR), where the integer
404 OFFSET is a count of seconds east of Universal Time, and the string
405 ABBR is a time zone abbreviation. The affected functions are
406 'current-time-string', 'current-time-zone', 'decode-time',
407 'format-time-string', and 'set-time-zone-rule'.
410 * Changes in Emacs 25.2 on Non-Free Operating Systems
412 ** Intercepting hotkeys on Windows 7 and later now works better.
413 The new keyboard hooking code properly grabs system hotkeys such as
414 Win-* and Alt-TAB, in a way that Emacs can get at them before the
415 system. This makes the 'w32-register-hot-key' functionality work
416 again on all versions of MS-Windows starting with Windows 7. On
417 Windows NT and later you can now register any hotkey combination. (On
418 Windows 9X, the previous limitations, spelled out in the Emacs manual,
421 ** `convert-standard-filename' no longer mirrors slashes on MS-Windows.
422 Previously, on MS-Windows this function converted slash characters in
423 file names into backslashes. It no longer does that.
426 * Installation Changes in Emacs 25.1
429 ** Building Emacs now requires C99 or later.
432 ** Building Emacs now requires GNU make, version 3.81 or later.
435 ** New configure option --with-cairo.
436 This builds Emacs with Cairo drawing. As a side effect, it provides
437 support for built-in printing, when Emacs was built with GTK+.
438 Cairo drawing is an experimental feature in Emacs, and subject to
439 change in future releases.
442 ** New configure option --with-modules.
443 This enables support for loading dynamic modules; see below.
446 ** By default, Emacs no longer works on IRIX. We expect that Emacs
447 users are not affected by this, as SGI stopped supporting IRIX in
448 December 2013. If you are affected, please send a bug report. You
449 should be able to work around the problem either by porting the Emacs
450 undumping code to GCC under IRIX, or by configuring --with-wide-int,
451 or by sticking with Emacs 24.4.
454 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
455 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
456 since Emacs 24.4, and the other variants were undocumented and were
457 obstacles to maintenance and development. GC_MARK_STACK and its
458 related symbols have been removed from the C internals.
461 ** 'configure' now prefers gnustep-config when configuring GNUstep.
462 If gnustep-config is not available, the old heuristics are used.
465 ** 'configure' now prefers inotify to gfile for file notification,
466 unless gfile is explicitly requested via --with-file-notification='gfile'.
469 ** 'configure' detects the kqueue file notification library on *BSD
470 and Mac OS X machines.
473 ** The configure option '--with-pkg-config-prog' has been removed.
474 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
477 ** The configure option '--with-mmdf' has been removed.
478 It was no longer useful, as it relied on libraries that are no longer
479 supported, and its presence led to confusion during configuration.
480 This affects only the 'movemail' utility; Emacs itself can still
481 process MMDF-format files as before.
484 ** The configure option '--enable-silent-rules' is now the default,
485 and silent rules are now quieter. To get the old behavior where
486 'make' chatters a lot, configure with '--disable-silent-rules' or
487 build with 'make V=1'.
490 ** The configure option '--with-gameuser' now allows you to specify a
491 group instead of a user if its argument is prefixed by ':' (a colon).
492 This will cause the game score files in ${localstatedir}/games/emacs
493 to be owned by that group, and the helper program for updating them to
494 be installed setgid. The option now defaults to the 'games' group.
497 ** The 'grep-changelog' script (and its manual page) are no longer included.
498 It has no particular connection to Emacs and has not changed in years,
499 so if you want to use it, you can always take a copy from an older Emacs.
502 ** Emacs 25 comes with a new set of icons.
503 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
504 The old Emacs logo icons are available as 'emacs23.png' in the same location.
507 ** New make target 'check-expensive' to run additional tests.
508 This includes all tests which run via "make check", plus additional
509 tests which take more time to perform.
512 * Startup Changes in Emacs 25.1
515 ** When Emacs is given a file as a command line argument and
516 'initial-buffer-choice' is non-nil, display both the file and
517 'initial-buffer-choice'. When Emacs is given more than one file and
518 'initial-buffer-choice' is non-nil, show 'initial-buffer-choice'
519 and *Buffer List*. This makes Emacs convenient to use from the
520 command line when 'initial-buffer-choice' is non-nil.
523 ** The value of 'initial-scratch-message' is now treated as a doc string
524 and can contain escape sequences for command keys, quotes, and the like.
527 ** The default height of GUI frames was enlarged.
528 This is so there's enough space in the initial window to display the
529 optional text about recovering crashes sessions, without losing the
530 splash image display.
533 * Changes in Emacs 25.1
536 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
537 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
538 xwidget support, you can access the embedded webkit browser with 'M-x
539 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
540 browser. The buffer will have a new mode, 'xwidget-webkit-mode'
541 (similar to 'image-mode'), which supports the webkit widget.
544 *** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
545 'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
546 'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
547 'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
548 'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
549 'xwidget-webkit-scroll-up'.
552 ** Emacs can now load shared/dynamic libraries (modules).
553 A dynamic Emacs module is a shared library that provides additional
554 functionality for use in Emacs Lisp programs, just like a package
555 written in Emacs Lisp would. The functions 'load', 'require',
556 'load-file', etc. were extended to load such modules, as they do with
557 Emacs Lisp packages. The new variable 'module-file-suffix' holds the
558 system-dependent value of the file-name extension ('.so' on Posix
559 hosts) of the module files.
561 A module should export a C-callable function named
562 'emacs_module_init', which Emacs will call as part of the call to
563 'load' or 'require' which loads the module. It should also export a
564 symbol named 'plugin_is_GPL_compatible' to indicate that its code is
565 released under the GPL or compatible license; Emacs will refuse to
566 load modules that don't export such a symbol.
568 If a module needs to call Emacs functions, it should do so through the
569 API defined and documented in the header file 'emacs-module.h'. Note
570 that any module that provides Lisp-callable functions will have to use
571 Emacs functions such as 'fset' and 'funcall', in order to register its
572 functions with the Emacs Lisp interpreter.
574 Modules can create 'user-ptr' Lisp objects that embed pointers to C
575 structs defined by the module. This is useful for keeping around
576 complex data structures created by a module, to be passed back to the
577 module's functions. User-ptr objects can also have associated
578 "finalizers" -- functions to be run when the object is GC'ed; this is
579 useful for freeing any resources allocated for the underlying data
580 structure, such as memory, open file descriptors, etc. A new
581 predicate 'user-ptrp' returns non-nil if its argument is a 'user-ptr'
584 Loadable modules in Emacs are an experimental feature, and subject to
585 change in future releases. For that reason, their support is disabled
586 by default, and must be enabled by using the '--with-modules' option
590 ** Network security (TLS/SSL certificate validity and the like) is
591 added via the new Network Security Manager (NSM) and controlled via
592 the 'network-security-level' variable.
595 ** C-h l now also lists the commands that were run.
598 ** x-select-enable-clipboard is renamed select-enable-clipboard
599 and x-select-enable-primary is renamed select-enable-primary.
600 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
601 name it), with the proviso that on some systems (e.g. Windows)
602 select-enable-primary is ineffective since the system doesn't
603 have the equivalent of a primary selection.
606 ** New option 'switch-to-buffer-in-dedicated-window' allows you to
607 customize how 'switch-to-buffer' proceeds interactively when the
608 selected window is strongly dedicated to its buffer.
611 ** The option 'even-window-heights' has been renamed to
612 'even-window-sizes' and now handles window widths as well.
615 ** terpri gets an optional arg ENSURE to conditionally output a newline.
618 ** 'insert-register' now leaves point after the inserted text
619 when called interactively. A prefix argument toggles this behavior.
622 ** The new variable 'term-file-aliases' replaces some files from lisp/term.
623 The function 'tty-run-terminal-initialization' consults this variable
624 when deciding what terminal-specific initialization code to run.
627 ** New variable 'system-configuration-features', listing some of the
628 main features that Emacs was compiled with. This is mainly intended
629 for use in Emacs bug reports.
632 ** A password is now hidden also when typed in batch mode. Another
633 hiding character but the default '.' can be used by let-binding the
634 variable 'read-hide-char'.
637 ** The Emacs pseudo-random number generator can be securely seeded.
638 On system where Emacs can access the system entropy or some other
639 cryptographically secure random stream, it now uses that when 'random'
640 is called with its argument 't'. This allows cryptographically strong
641 random values; in particular, the Emacs server now uses this facility
642 to produce its authentication key.
645 ** New input methods: 'tamil-dvorak' and 'programmer-dvorak'.
648 * Editing Changes in Emacs 25.1
651 ** M-x suggests shorthands and ignores obsolete commands for completion.
656 *** Successive single-char deletions are collapsed in the undo-log just like
657 successive char insertions. Which commands invoke this behavior is
658 controlled by the new 'undo-auto-amalgamate' function. See the node
659 "Undo" in the ELisp manual for more details.
662 *** The heuristic used to insert 'undo-boundary' after each command
663 has changed, so that if a command causes changes in more than just the
664 current buffer, Emacs now calls 'undo-boundary' in every buffer
665 affected by the command.
668 ** New command 'comment-line' bound to 'C-x C-;'.
670 ** New and improved facilities for inserting Unicode characters
673 *** Unicode names entered via C-x 8 RET now use substring completion by default.
676 *** C-x 8 now has shorthands for several chars, such as U+2010
677 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH). As
678 before, you can type C-x 8 C-h to list shorthands.
681 *** New minor mode electric-quote-mode for using curved quotes as you
682 type. See also the new variable 'text-quoting-style'.
685 ** New minor mode global-eldoc-mode is enabled by default.
688 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
689 Bracketed paste mode causes text terminals to wrap pasted text in special
690 escape sequences that allow Emacs to tell the difference between text
691 you type and text you paste from other applications. Emacs then
692 avoids interpreting each character in the pasted text as it does with
693 keyboard input, which results in a paste experience similar to that
694 under a window system, and significant performance improvements when
695 pasting large amounts of text.
697 Bracketed paste mode is disabled by default, so Emacs automatically
698 enables it at startup if the terminal supports it.
701 ** Emacs now supports the latest version of the UBA.
702 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
703 was updated to support all the latest additions and changes introduced
704 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
705 This includes full support for directional isolates and the
706 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
710 ** You can access 'mouse-buffer-menu' (C-down-mouse-1) using C-f10.
713 ** New buffer-local 'electric-pair-local-mode'.
716 ** New variable 'fast-but-imprecise-scrolling' inhibits
717 fontification during full screen scrolling operations, giving less
718 hesitant operation during auto-repeat of C-v, M-v at the cost of
719 possible inaccuracies in the end position.
722 ** New documentation command 'describe-symbol'.
723 Works for functions, variables, faces, etc. It is bound to 'C-h o' by
727 ** New function 'custom-prompt-customize-unsaved-options' checks for
728 unsaved customizations and prompts user to customize (if found). It
729 is intended for adding to 'kill-emacs-query-functions'.
732 ** The old 'C-x w' bindings in hi-lock-mode are officially deprecated
733 in favor of the global 'M-s h' bindings introduced in Emacs-23.1.
734 They'll disappear soon.
737 * Changes in Specialized Modes and Packages in Emacs 25.1
742 *** New command 'checkdoc-package-keywords' checks if the
743 current package keywords are recognized. Set the new option
744 'checkdoc-package-keywords-flag' to non-nil to make
745 'checkdoc-current-buffer' call this function automatically.
748 *** New function 'checkdoc-file' checks for style errors.
749 It's meant for use together with 'compile':
750 emacs -batch --eval "(checkdoc-file \"subr.el\")"
755 *** The desktop format version has been upgraded from 206 to 208.
756 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
757 cannot read a version 208 desktop. To upgrade your desktop file, you
758 must explicitly request the upgrade, by C-u M-x desktop-save. You are
759 recommended to do this as soon as you have firmly upgraded to Emacs
760 25.1 (or later). Should you ever need to downgrade your desktop file
761 to version 206, you can do this with C-u C-u M-x desktop-save.
764 ** New function 'bookmark-set-no-overwrite' bound to C-x r M.
765 It raises an error if a bookmark of that name already exists,
766 unlike 'bookmark-set' which silently updates an existing bookmark.
771 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
772 now control how mm-* functions fetch and display images in an HTML
773 message. Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
774 for that purpose, i.e., binds mm-html- variables with those gnus-
775 variables, but other packages do not have to bind gnus- variables now.
778 *** 'mm-inline-text-html-with-images' has been removed.
779 Use 'mm-html-inhibit-images' instead. Note that the value is opposite
785 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
786 GnuTLS encryption functions if possible.
791 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
792 the ordering of object keys by default.
795 *** New commands 'json-pretty-print-ordered' and
796 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
797 object keys sorted alphabetically.
799 ** Prettify Symbols mode
802 *** Prettify Symbols mode supports custom composition predicates. By
803 overriding the default 'prettify-symbols-compose-predicate', modes can
804 specify in which contexts a symbol may be displayed as some Unicode
805 character. 'prettify-symbols-default-compose-p' is the default which
806 is suitable for most programming languages such as C or Lisp (but not
810 *** Symbols can be unprettified while point is inside them.
811 New variable 'prettify-symbols-unprettify-at-point' configures this.
813 ** Enhanced xterm support
816 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
817 This variable tells Emacs which advanced capabilities are available in
818 the xterm terminal emulator used to display Emacs text-mode frames.
819 The default is to check each capability, and use it if available.
820 (This variable was introduced in Emacs 24.1, but was not announced in
824 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
825 in the surrounding GUI (using the OSC-52 escape sequence). This only works
826 if your xterm supports it and enables the 'allowWindowOps' options (disabled
827 by default at least in Debian, for security reasons).
829 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
830 escape sequence) if your xterm has the feature enabled but for that you
831 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
834 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
837 ** The way to turn on and off 'save-place' mode has changed.
838 It is no longer sufficient to load the saveplace library and set
839 'save-place' non-nil. Instead, use the two new minor modes:
840 'save-place-mode' turns on saving last place in every file, and
841 'save-place-local-mode' does that only for the file in whose buffer it
842 is invoked. The 'save-place' variable is now an obsolete alias for
843 'save-place-mode', which replaces it, and 'toggle-save-place' is an
844 obsolete alias for the new 'save-place-local-mode' command.
849 *** ERC can now hide message types by network or channel.
850 'erc-hide-list' will hide all messages of the specified type, while
851 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
852 specified message types for the respective specified targets.
855 *** Reconnection is now asynchronous.
858 *** Nick completion is now case-insensitive again after inadvertently
859 being made case-sensitive in Emacs 24.2.
864 *** New commands, key binds, and menu items.
866 **** '<' and '>' for navigating previous and next tracks in playlist
868 **** New play/pause command 'mpc-toggle-play' bound to 's'
870 **** 'g' bound to new command 'mpc-seek-current' will navigate current
873 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
874 toggling playback modes.
877 *** Now supports connecting to a UNIX domain socket.
880 *** Looks at more image file names to use as album art.
881 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
882 (XP) in addition to cover.jpg.
885 *** Searches in more locations for MPD configuration files.
886 MPD supports the XDG base directory specification since version 0.17.6.
891 *** 'midnight-mode' is now a proper minor mode.
894 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
899 *** New "external" package status.
900 An external package is any installed package that's not built-in and
901 not from 'package-user-dir', which usually means it's from an entry in
902 'package-directory-list'. They are treated much like built-in
903 packages, in that they cannot be deleted through the package menu and
904 are not considered for upgrades.
906 The effect is that a user can manually place a specific version of a
907 package inside 'package-directory-list' and the package menu will
911 *** If a package is available on multiple archives and one has higher
912 priority (as per 'package-archive-priorities') only that one is
913 listed. This can be configured with 'package-menu-hide-low-priority'.
916 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
917 This includes the above-mentioned low-priority packages, as well as
918 available packages whose version is lower than the currently installed
919 version (which were previously impossible to display).
920 This allows users to downgrade a package if a lower version is
924 *** When filtering the package menu, keywords starting with "arc:" or
925 "status:" represent package archive or status, respectively, instead
929 *** Most functions which involve downloading information now take an
930 ASYNC argument. If it is non-nil, package.el performs the download(s)
934 *** New variable 'package-menu-async' controls whether the
935 package-menu uses asynchronous downloads.
938 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
939 This follows the same rules as installing from a .tar file, except the
940 -pkg file is optional.
943 *** Packages which are dependencies of other packages cannot be deleted.
944 The FORCE argument to 'package-delete' overrides this.
947 *** New custom variable 'package-selected-packages' tracks packages
948 which were installed by the user (as opposed to installed as
949 dependencies). This variable can also be manually customized.
952 *** New command 'package-install-selected-packages' installs all
953 packages from 'package-selected-packages' which are currently missing.
956 *** 'package-install' function now takes a DONT-SELECT argument. If
957 this function is called interactively or if DONT-SELECT is nil, add the
958 package being installed to 'package-selected-packages'.
961 *** New command 'package-autoremove' removes all packages which were
962 installed strictly as dependencies but are no longer needed.
967 When you invoke 'shell' interactively, the *shell* buffer will now
968 display in a new window. However, you can customize this behavior via
969 the 'display-buffer-alist' variable. For example, to get
970 the old behavior -- *shell* buffer displays in current window -- use
971 (add-to-list 'display-buffer-alist
972 '("^\\*shell\\*$" . (display-buffer-same-window))).
976 *** The ':protection' slot option is not obeyed any more.
978 *** The 'newname' argument to constructors is optional&deprecated.
979 If you need your objects to be named, do it by inheriting from 'eieio-named'.
981 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
983 *** The <class> variables are declared obsolete.
985 *** The <initarg> variables are declared obsolete.
987 *** defgeneric and defmethod are declared obsolete.
988 Use the equivalent facilities from cl-generic.el instead.
990 *** 'constructor' is now an obsolete alias for 'make-instance'.
991 --- 'pcase' accepts a new UPattern 'eieio'.
996 *** New command 'ido-bury-buffer-at-head' bound to C-S-b
997 Bury the buffer at the head of 'ido-matches', analogous to how C-k
998 kills the buffer at head.
1001 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
1002 meaning, and the list is restricted to those elements that do not
1003 match the current input.
1008 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
1009 The new commands 'next-line-or-history-element' and
1010 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
1011 minibuffer, allow by-line movement through minibuffer history,
1012 similarly to an ordinary buffer. Only when point moves over
1013 the bottom/top of the minibuffer it goes to the next/previous history
1014 element. 'M-p' and 'M-n' still move directly to previous/next history
1017 ** Search and Replace
1020 *** 'isearch' and 'query-replace' can now perform character folding in matches.
1021 This is analogous to case folding, but instead of disregarding case
1022 variants, it disregards wider classes of distinctions between similar
1023 characters. (Case folding is a special case of character folding.)
1024 This means many characters in the search string will match entire
1025 groups of characters instead of just themselves.
1027 For instance, the ASCII double quote character " will match all
1028 variants of double quotes, and the letter 'a' will match all of its
1029 accented cousins, even those composed of multiple characters, as well
1030 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
1033 Character folding is enabled by customizing 'search-default-mode' to
1034 the value 'character-fold-to-regexp'. You can also toggle character
1035 folding in the middle of a search by typing 'M-s ''.
1037 'query-replace' honors character folding if the new variable
1038 'replace-character-fold' is customized to a non-nil value.
1041 *** New user option 'search-default-mode'.
1042 This option specifies the default mode for Isearch. The default
1043 value, nil specifies that Isearch does literal searches (however,
1044 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
1045 as in previous Emacs versions).
1048 *** New function 'character-fold-to-regexp' can be used
1049 by searching commands to produce a regexp matching anything that
1050 character-folds into STRING.
1053 *** The new M-s M-w key binding uses eww to search the web for the
1054 text in the region. The search engine to use for this is specified by
1055 the customizable variable 'eww-search-prefix'.
1058 *** Query-replace history is enhanced.
1059 When query-replace reads the FROM string from the minibuffer, typing
1060 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
1061 and TO are the original text and its replacement, and SEP is an arrow
1062 string defined by the new variable 'query-replace-from-to-separator'.
1063 To select a prior replacement, type 'M-p' until the desired
1064 replacement appears in the minibuffer, and then exit the minibuffer by
1069 *** If 'quick-calc' is called with a prefix argument, insert the
1070 result of the calculation into the current buffer.
1073 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
1074 this you can tell Edebug not to stop at the start of the first
1075 instrumented function.
1080 *** New minor mode 'global-eldoc-mode'
1081 It is turned on by default, and affects '*scratch*' and other buffers
1082 whose major mode supports Emacs Lisp.
1085 *** 'eldoc-documentation-function' now defaults to 'ignore'
1088 *** 'describe-char-eldoc' displays information about character at point,
1089 and can be used as a default value of 'eldoc-documentation-function'. It is
1090 useful when, for example, one needs to distinguish various spaces - e.g.,
1091 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
1092 using mono-spaced font.
1097 *** HTML can now be rendered using variable-width fonts.
1100 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
1101 whether to use variable-pitch fonts or not. The user can also
1102 customize the 'shr-use-fonts' variable.
1105 *** A new command 'R' ('eww-readable') will try do identify the main
1106 textual parts of a web page and display only that, leaving menus and
1107 the like off the page.
1110 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
1111 toggle the paragraph direction between left-to-right and right-to-left.
1114 *** You can now use several eww buffers in parallel by renaming eww
1115 buffers you want to keep separate.
1118 *** Partial state of the eww buffers (the URIs and the titles of the
1119 pages visited) is now preserved in the desktop file.
1122 *** 'eww-after-render-hook' is now called after eww has rendered
1123 the data in the buffer.
1126 *** The 'eww-reload' command now takes a prefix to not reload via
1127 the net, but just use the local copy of the HTML.
1130 *** The DOM shr and eww uses has been changed to the general Emacs
1131 xml.el/libxml2 DOM, and a new package dom.el has been added to
1132 interact with this DOM. See the Emacs Lisp manual for interface
1136 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
1139 *** The new 'S' command will list all eww buffers, and allow managing
1143 *** https pages with valid certificates have headers marked in green, while
1144 invalid certificates are marked in red.
1149 *** text/html messages that contain inline image parts will be
1150 transformed into multipart/related messages before sending.
1153 ** In Show Paren Mode, a parenthesis can be highlighted when point
1154 stands inside it, and certain parens can be highlighted when point is
1155 at BOL or EOL, or in whitespace there. To enable these, customize,
1156 respectively, 'show-paren-when-point-inside-paren' or
1157 'show-paren-when-point-in-periphery'.
1160 ** If gpg2 exists on the system, it is now used as the default value
1161 of 'epg-gpg-program' (instead of gpg).
1166 *** Strings after ':documentation' are highlighted as docstrings.
1167 This enhances Lisp mode fontification to handle documentation of the
1168 form '(:documentation "the doc string")' used in Common Lisp code for
1169 CLOS class and slot documentation.
1171 ** Rectangle editing
1174 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
1177 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
1178 *** 'string-rectangle' provides on-the-fly preview of the result.
1181 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
1182 These should be used in preference to 'font-lock-fontify-buffer' when
1186 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
1187 to 'minibuffer-setup-hook'.
1189 If the first argument of the macro is of the form '(:append FUN)',
1190 then FUN will be appended to 'minibuffer-setup-hook', instead of
1195 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
1198 *** 'pcase' accepts the new UPattern 'cl-struct'.
1200 ** Calendar and diary
1203 *** The default 'diary-file' is now located in .emacs.d.
1206 *** New commands to insert diary entries with Chinese dates:
1207 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
1208 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
1211 *** The calendar can now list and mark diary entries with Chinese dates.
1212 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
1215 *** The option 'calendar-mode-line-format' can now be nil,
1216 which means to do nothing special with the mode line in calendars.
1219 *** New option 'calendar-weekend-days'.
1220 The option customizes which day headers receive the
1221 'calendar-weekend-header' face.
1224 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
1227 *** Many items obsolete since at least version 23.1 have been removed.
1228 The majority were function/variable/face aliases, too numerous to list here.
1231 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
1232 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
1234 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
1236 **** Macro 'calendar-for-loop'.
1238 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
1240 **** The nil and list forms of 'diary-display-function'.
1243 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
1244 If the output of ERT tests in batch mode execution can be saved to a
1245 log file, then it can be passed as an argument to the above function
1246 to produce a neat summary.
1249 ** New js.el option 'js-indent-first-init'.
1254 ** Info mode now displays symbol names in fixed-pitch font.
1255 If you want to get the old behavior back, customize the 'Info-quoted'
1256 face to use the same definitions as the default face.
1259 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
1262 *** 'info-display-manual' can now be given a prefix argument which (any
1263 non-nil value) directs the command to limit the completion
1264 alternatives to currently visited manuals.
1267 ** ntlm.el has support for NTLM2.
1272 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
1273 to delete or undelete multiple messages.
1276 *** Rmail can now render HTML mail messages if your Emacs was built with
1277 libxml2 or if you have the Lynx browser installed. By default, Rmail
1278 will display the HTML version of a mail message that has both HTML and
1279 plain text parts, if display of HTML email is possible; customize the
1280 'rmail-mime-prefer-html' option to 'nil' if you don't want that.
1283 *** In the commands that make summaries by subject, recipients, or senders,
1284 you can no longer use commas to separate regular expressions.
1287 ** SES now supports local printer functions; see 'ses-define-local-printer'.
1289 ** Shell-script Mode
1291 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
1292 specify the type of shell in use (bash, csh, etc).
1295 *** New value 'always' for 'sh-indent-after-continuation'.
1296 This provides old-style ("dumb") indentation of continued lines.
1297 See the doc string of 'sh-indent-after-continuation' for details.
1301 *** Fatal TLS errors are now silent by default.
1304 *** If Emacs isn't built with TLS support, an external TLS-capable
1305 program is used instead. This program used to be run in --insecure
1306 mode by default, but has now changed to be secure instead, and will
1307 fail if you try to connect to non-verifiable hosts. This is
1308 controlled by the 'tls-program' variable.
1313 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1314 When 'url-handler-mode' is enabled, file operations for these
1315 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1318 *** The URL package allows customizing the 'url-user-agent' string.
1319 The new 'url-user-agent' variable can be customized to be a string or
1323 *** The new interface variable 'url-request-noninteractive' can be used
1324 to specify that we're running in a noninteractive context, and that
1325 we should not be queried about things like TLS certificate validity.
1328 *** 'url-mime-accept-string' can now be used as in "interface"
1329 variable, meaning you can bind it around an 'url-retrieve' call.
1332 *** If URL is used with a https connection, the first callback argument
1333 plist will contain a :peer element that has the output of
1334 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
1339 *** New connection method "afp", which allows you to access Mac OS X
1340 volumes via the Apple Filing Protocol.
1343 *** New connection method "nc", which allows you to access dumb
1347 *** Method-specific parameters can be overwritten now with variable
1348 'tramp-connection-properties'.
1351 *** Handler for 'file-notify-valid-p' for remote machines that support
1352 filesystem notifications.
1357 *** New user variable 'sql-default-directory' enables remote
1358 connections using Tramp.
1361 *** New command 'sql-send-line-and-next'.
1362 This command, bound to 'C-c C-n' by default, sends the current line to
1363 the SQL process and advances to the next line, skipping whitespace and
1367 *** Added support for Vertica SQL.
1369 ** VC and related modes
1372 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
1373 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1374 (undocumented) command vc-hg-push now behaves slightly differently.
1377 *** The new command vc-region-history shows the log+diff of the active region.
1380 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
1381 This command is useful when you perform version control commands
1382 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1383 back-end for the buffer's file, or remove it from version control.
1386 *** New option 'vc-annotate-background-mode' controls whether
1387 the color range from 'vc-annotate-color-map' is applied to the
1388 background or to the foreground.
1391 *** New options for customizing encoding of Git commit log messages.
1392 The new user options 'vc-git-commits-coding-system' and
1393 'vc-git-log-output-coding-system' specify the encoding of log messages
1394 sent to Git when committing, and the decoding of log messages read
1395 from Git history commands. These options default to UTF-8; if
1396 customized, they should be consistent with the Git config variables
1397 i18n.commitEncoding and i18n.logOutputEncoding.
1398 ('vc-git-commits-coding-system' existed previously, but was a
1399 variable, not a user option.)
1402 *** 'compare-windows' now compares text with the most recently selected window
1403 instead of the next window. If you want the previous behavior of
1404 comparing with the next window, customize the new option
1405 'compare-windows-get-window-function' to the value
1406 'compare-windows-get-next-window'.
1409 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
1410 replace the face 'compare-windows', which is now an obsolete alias for
1411 'compare-windows-added'.
1414 *** The VC state indicator in the mode line now has different faces
1415 corresponding to each of the possible states. See the 'vc-faces'
1416 customization group.
1419 *** 'log-edit-insert-changelog' converts "(tiny change)" to
1420 "Copyright-paperwork-exempt: yes". Set 'log-edit-rewrite-tiny-change'
1421 nil to disable this.
1424 *** vc-mcvs.el has been removed.
1427 ** VHDL mode now supports VHDL'08.
1432 *** Decimal display mode uses "," groups, so it's more
1433 fitting for use in money calculations
1436 *** Factorial works with non-integer inputs.
1441 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1442 macro argument expansion, interactive macro evaluation and automatic
1443 scanning of #define'd symbols.
1446 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
1447 result of evaluating a macro.
1450 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
1451 all defined symbols in 'hide-ifdef-env'.
1454 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
1455 file name patterns. Defaults to files whose extension is one of '.h',
1456 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
1459 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
1460 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1461 (This could happen when an idempotent header file is visited again,
1462 when its guard symbol is already defined.) Defaults to 't'.
1465 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
1466 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1467 looking for macro definitions. By default, no symbols are ignored.
1472 *** New custom variable 'tex-print-file-extension' to help users who
1473 use PDF instead of DVI.
1476 *** TeX mode now supports Prettify Symbols mode. When enabling
1477 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1478 many other math macros are displayed using unicode characters.
1481 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
1482 By default, 32 consecutive spaces or four consecutive TABs are
1483 considered to be too deep, but the new variable
1484 'whitespace-big-indent-regexp' can be customized to change that.
1487 ** New options in 'tildify-mode'.
1488 New options 'tildify-space-string', 'tildify-pattern', and
1489 'tildify-foreach-region-function' variables make
1490 'tildify-string-alist', 'tildify-pattern-alist', and
1491 'tildify-ignored-environments-alist' variables (as well as a few
1492 helper functions) obsolete.
1495 ** New package Xref replaces Etags's front-end and UI
1497 The new package Xref provides a generic framework and new commands to
1498 find and move to definitions of functions, macros, data structures
1499 etc., as well as go back to the location where you were before moving
1500 to a definition. It supersedes and obsoletes many Etags commands,
1501 while still using the etags.el code that reads the TAGS tables as one
1504 The command 'xref-find-definitions' replaces 'find-tag' and provides
1505 an interface to pick one definition among several.
1506 'tags-loop-continue' is now unbound. 'xref-pop-marker-stack' replaces
1507 'pop-tag-mark', but has a keybinding ('M-,') different from the one
1508 'pop-tag-mark' used.
1510 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
1511 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
1512 'xref-find-apropos' replaces 'find-tag-regexp'.
1514 As a result of this, the following commands are now obsolete:
1515 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
1518 'tags-loop-continue' is not obsolete because it's still useful in
1519 'tags-search' and 'tags-query-replace', for which there are no direct
1523 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
1524 replaced by xref-style commands, see the "Dired" section below.
1529 'find-tag-marker-ring-length' is now an obsolete alias for
1530 'xref-marker-ring-length'. 'find-tag-marker-ring' is now an obsolete
1531 alias for a private variable. 'xref-push-marker-stack' and
1532 'xref-pop-marker-stack' should be used instead to manipulate the stack
1533 of searches for definitions.
1536 *** 'xref-find-definitions' and 'describe-function' now display
1537 information about mode local overrides (defined by cedet/mode-local.el
1538 'define-overloadable-function' 'define-mode-local-overrides').
1540 The framework's Lisp API is still experimental and can change in major,
1541 backward-incompatible ways.
1544 ** New package Project
1546 The new package Project provides generic infrastructure for dealing
1547 with projects. The main commands included in it are
1548 'project-find-file' and 'project-find-regexp'.
1550 The Lisp API of this package is still experimental.
1553 EUDC's LDAP backend has been improved.
1556 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1559 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1560 subprocess instead of on the command line.
1563 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1564 need to configure this manually anymore.
1567 *** The LDAP configuration section of EUDC's manual has been
1570 There have also been customization changes.
1573 *** New custom variable 'eudc-server-hotlist' to allow specifying
1574 multiple EUDC servers in init file.
1577 *** Custom variable 'eudc-inline-query-format' defaults to completing
1578 on email and firstname instead of surname.
1581 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
1582 to avoid interfering with the kill ring.
1585 *** Custom variable 'eudc-inline-expansion-format' defaults to
1586 "Firstname Surname <mail-address>".
1589 *** Custom variable 'eudc-options-file' defaults to
1590 "~/.emacs.d/eudc-options".
1593 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
1594 allow overriding the regular expression that recognizes the ldapsearch
1595 command line's password prompt.
1598 EUDC's BBDB backend now supports BBDB 3.
1601 EUDC's PH backend (eudcb-ph.el) is obsolete.
1606 *** The new built-in command 'clear' can scroll window contents out of sight.
1607 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1610 *** New buffer syntax '#<buffer-name>', which is equivalent to
1611 '#<buffer buffer-name>'. This shorthand makes interacting with
1612 buffers from eshell more convenient. Custom variable
1613 'eshell-buffer-shorthand', which has been broken for a while, has been
1617 *** By default, eshell "visual" program buffers (created by
1618 'eshell-visual-commands' and similar custom vars) are no longer killed
1619 when their processes die. This fixes issues with short-lived commands
1620 and makes visual programs more useful in general. For example, if
1621 "git log" is a visual command, it will always show the visual command
1622 buffer, even if the "git log" process dies. For the old behavior,
1623 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
1628 *** Support for the Google Chrome web browser.
1631 *** Support for the Conkeror web browser.
1634 *** Support for several ancient browsers is now officially obsolete.
1637 ** tar-mode: new 'tar-new-entry' command, allowing for new members to
1638 be added to the archive.
1643 *** Dired buffers are also auto-reverted via file notifications, if
1644 Emacs is compiled with file notification support.
1647 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
1648 See <http://debbugs.gnu.org/22814>.
1650 ** File Notifications
1653 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1656 *** The new event 'stopped' signals, that a file notification watch is
1657 not active any longer.
1660 *** The new function 'file-notify-valid-p' checks, whether a file
1661 notification descriptor still corresponds to an activate watch.
1666 *** The command 'dired-do-compress' bound to 'Z' now can compress
1667 directories and decompress zip files.
1670 *** New command 'dired-do-compress-to' bound to 'c' can be used to
1671 compress many marked files into a single named archive. The
1672 compression command is determined from the new
1673 'dired-compress-files-alist' variable.
1676 *** New user interface for the 'A' and 'Q' commands.
1677 These keys, now bound to 'dired-do-find-regexp' and
1678 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
1679 and 'xref-query-replace-in-results': they present the matches
1680 in the '*xref*' buffer and let you move through the matches. No need
1681 to use 'tags-loop-continue' to resume the search or replace loop. The
1682 previous commands, 'dired-do-search' and
1683 'dired-do-query-replace-regexp', are still available, but not bound to
1684 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
1685 back. We intend to obsolete the old commands in a future release.
1687 ** Tabulated List Mode
1690 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
1691 call 'tabulated-list-init-header', in which case it will have no
1695 *** 'tabulated-list-print' takes a second optional argument, update,
1696 which specifies an alternative printing method which is faster when
1697 few or no entries have changed.
1699 ** Obsolete packages
1705 *** landmark.el (moved to elpa.gnu.org)
1708 * New Modes and Packages in Emacs 25.1
1711 ** pinentry.el allows GnuPG passphrase to be prompted through the
1712 minibuffer instead of a graphical dialog, depending on whether the gpg
1713 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1714 is set). This feature requires newer versions of GnuPG (2.1.5 or
1715 later) and Pinentry (0.9.5 or later). To use this feature, add
1716 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1717 configuration with "gpgconf --reload gpg-agent".
1720 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1721 The main entry points are 'cl-defgeneric' and 'cl-defmethod'. See the
1722 node "Generic Functions" in the Emacs Lisp manual for more details.
1725 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1726 SCSS (Sassy CSS) files.
1729 ** let-alist is a new macro (and a package) that allows one to easily
1730 let-bind the values stored in an alist.
1733 ** 'tildify-mode' allows automatic insertion of hard spaces as one
1734 types the text. Breaking line after a single-character words is
1735 forbidden by Czech and Polish typography (and may be discouraged in
1736 other languages), so 'auto-tildify-mode' makes it easier to create
1737 a typographically-correct documents.
1740 ** The 'seq' library adds sequence manipulation functions and macros
1741 that complement basic functions provided by subr.el. All functions
1742 are prefixed with 'seq-' and work on lists, strings and vectors.
1743 'pcase' accepts a new Upattern 'seq'.
1746 ** The 'map' library provides map-manipulation functions that work on
1747 alists, hash-table and arrays. All functions are prefixed with
1748 'map-'. 'pcase' accepts a new UPattern 'map'.
1751 ** The 'thunk' library provides functions and macros to control the
1752 evaluation of forms.
1755 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1756 support for JSX, an XML-like syntax extension to ECMAScript.
1759 * Incompatible Lisp Changes in Emacs 25.1
1762 ** 'setq' and 'setf' must now be called with an even number of
1763 arguments. The earlier behavior of silently supplying a nil to the
1764 last variable when there was an odd number of arguments has been
1768 ** 'syntax-begin-function' is declared obsolete.
1769 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1770 slot in font-lock-defaults.
1773 ** The new implementation of Subword mode affects word movement everywhere.
1774 When Subword mode is turned on, 'forward-word', 'backward-word', and
1775 everything that uses them will move by sub-words, effectively
1776 overriding the buffer's syntax table. Lisp programs that shouldn't be
1777 affected by Subword mode should call the new functions
1778 'forward-word-strictly' and 'backward-word-strictly' instead.
1781 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
1782 called during startup. Users who call this function in their init
1783 file and still expect it to be run after startup should set
1784 'package-enable-at-startup' to t after the call to
1785 'package-initialize'.
1788 ** ':global' minor mode use 'setq-default' rather than 'setq'.
1789 This means that you can't use 'make-local-variable' and expect them to
1790 "magically" become buffer-local.
1793 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
1794 The 'track-mouse' form no longer refrains from changing the shape of
1795 the mouse pointer for the entire time the body of that form is
1796 executed. Lisp programs that use 'track-mouse' for dragging across
1797 large portions of the Emacs display, and want to avoid changes in the
1798 pointer shape during dragging, should bind the variable 'track-mouse'
1799 to the special value 'dragging' in the body of the form.
1802 ** The optional 'predicate' argument of 'lisp-complete-symbol' no longer
1803 has any effect. (This change was made in Emacs 24.4 but was not
1804 advertised at the time.)
1807 ** 'indirect-function' does not signal 'void-function' any more.
1808 This is mostly a bug-fix, since this change was missed back in 24.4 when
1809 symbol-function was changed not to signal 'void-function' any more.
1812 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
1815 ** M-x shell and M-x compile no longer set the EMACS environment variable.
1816 This avoids clashing when other programs use the variable for other purposes.
1817 Although M-x term still sets EMACS for compatibility with Bash 4.3 and earlier,
1818 this is deprecated and will be phased out when Bash 4.4 or later takes over.
1819 Use the INSIDE_EMACS environment variable instead.
1822 ** 'save-excursion' does not save&restore the mark any more.
1823 Use 'save-mark-and-excursion' if you want the old behavior.
1826 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
1827 argument ('predicate').
1830 ** 'completion-table-dynamic' by default stays in the minibuffer.
1831 The minibuffer will be the current buffer when the function is called.
1832 If you want the old behavior of calling the function in the buffer
1833 from which the minibuffer was entered, use the new argument
1834 'switch-buffer' to 'completion-table-dynamic'.
1837 ** window-configurations no longer record the buffers' marks.
1840 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1841 active region handling.
1844 ** deactivate-mark is now buffer-local.
1847 ** 'cl-the' now asserts that its argument is of the given type.
1850 ** 'process-running-child-p' may now return a numeric process
1851 group ID instead of 't'.
1854 ** Mouse click events on mode line or header line no longer include
1855 any reference to a buffer position. The 6th member of the mouse
1856 position list returned for such events is now nil.
1859 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1860 These slots used to hold key-shortcut data, but have been obsolete since
1864 ** Emacs no longer downcases the first letter of a system diagnostic
1865 when signaling a file error. For example, it now reports "Permission
1866 denied" instead of "permission denied". The old behavior was problematic
1867 in languages like German where downcasing rules depend on grammar.
1870 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
1871 Set it to 'curve' for curved single quotes, to 'straight' for straight
1872 apostrophes, and to 'grave' for grave accent and apostrophe. The
1873 default value nil acts like 'curve' if curved single quotes are
1874 displayable, and like 'grave' otherwise. The new variable affects
1875 display of diagnostics and help, but not of info.
1878 ** substitute-command-keys now replaces quotes.
1879 That is, it converts documentation strings' quoting style as per the
1880 value of 'text-quoting-style'. Doc strings in source code can use
1881 either curved single quotes or grave accents and apostrophes. As
1882 before, characters preceded by \= are output as-is.
1885 ** Message-issuing functions 'error', 'message', etc. now convert quotes.
1886 They use the new 'format-message' function instead of plain 'format',
1887 so that they now follow user preference as per 'text-quoting-style'
1888 when processing curved single quotes, grave accents, and apostrophes
1889 in their format argument.
1892 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1893 now match multibyte characters using Unicode character properties.
1894 If you want the old behavior where they matched any character with
1895 word syntax, use '\sw' instead.
1898 ** The character classes [:graph:] and [:print:] in regular expressions
1899 no longer match every multibyte character. Instead, Emacs now
1900 consults the Unicode character properties to determine which
1901 characters are graphic or printable. In particular, surrogates and
1902 unassigned codepoints are now rejected. If you want the old behavior,
1903 use [:multibyte:] instead.
1906 ** The 'diff' command uses the unified format now. To restore the old
1907 behavior, set 'diff-switches' to '-c'.
1910 ** 'grep-template' and 'grep-find-template' values don't include the
1911 --color argument anymore. It's added at the <C> place holder position
1912 dynamically. Any third-party code that changes these templates should
1913 be updated accordingly.
1916 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
1917 The new behavior is compatible with Common Lisp and with XEmacs.
1918 This change does not affect Lisp code intended to be portable to
1919 Emacs 24.2 and earlier, which did not support unary '/'.
1922 ** The 'default-directory' value doesn't have to end slash. To make
1923 that happen, 'unhandled-file-name-directory' now defaults to calling
1924 'file-name-as-directory'.
1927 * Lisp Changes in Emacs 25.1
1931 *** New UPatterns 'quote', 'app'.
1933 *** New UPatterns can be defined with 'pcase-defmacro'.
1935 *** New vector QPattern.
1938 ** syntax-propertize is now automatically called on-demand during forward
1939 parsing functions like 'forward-sexp'.
1942 ** New hooks 'prefix-command-echo-keystrokes-functions' and
1943 'prefix-command-preserve-state-hook' allow the definition of prefix
1944 commands other than the predefined 'C-u'.
1947 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
1948 These allow conversion between buffer positions and the corresponding
1949 file byte offsets, given the file's encoding.
1952 ** The default value of 'load-read-function' is now 'read'.
1953 Previously, the default value of 'nil' implied using 'read'.
1956 ** New hook 'pre-redisplay-functions'.
1957 It is a bit easier to use than 'pre-redisplay-function'.
1960 ** The second arg of 'looking-back' should always be provided explicitly.
1961 Previously, it was an optional argument, now it's mandatory.
1964 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
1965 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
1966 implemented by the new 'cursor-intangible-mode' and
1967 'cursor-sensor-mode' minor modes.
1970 ** 'inhibit-point-motion-hooks' now defaults to 't' and is obsolete.
1971 Use the new minor modes 'cursor-intangible-mode' and
1972 'cursor-sensor-mode' instead.
1975 ** New process type 'pipe', which can be used in combination with the
1976 ':stderr' keyword of make-process to handle standard error output
1980 ** New function 'make-process' provides an alternative interface to
1981 'start-process'. It allows programs to set process parameters such as
1982 process filter, sentinel, etc., through keyword arguments (similar to
1983 'make-network-process').
1986 ** A new function 'directory-files-recursively' returns all matching
1987 files (recursively) under a directory.
1990 ** New variable 'inhibit-message', when bound to non-nil, inhibits
1991 'message' and related functions from displaying messages in the echo
1992 area. The output is still logged to the *Messages* buffer.
1995 ** A new text property 'inhibit-read-only' can be used in read-only
1996 buffers to allow certain parts of the text to be writable.
1999 ** A new variable 'comment-end-can-be-escaped' is useful in languages
2000 such as C and C++ where line comments with escaped newlines are
2001 continued to the next line.
2004 ** New macro 'define-advice'.
2007 ** Emacs Lisp now supports generators.
2008 See the "Generators" section of the ELisp manual for the details.
2011 ** New finalizer facility for running code when objects become unreachable.
2012 See the "Finalizer Type" subsection in the ELisp manual for the
2016 ** lexical closures can use (:documentation FORM) to build their docstring.
2017 It should be placed right where the docstring would be, and FORM is then
2018 evaluated (and should return a string) when the closure is built.
2021 ** define-inline provides a new way to define inlinable functions.
2024 ** New function 'macroexpand-1' to perform a single step of macro expansion.
2027 ** Some "x-*" functions were obsoleted and/or renamed:
2028 *** x-select-text is renamed gui-select-text.
2029 *** x-selection-value is renamed gui-selection-value.
2030 *** x-get-selection is renamed gui-get-selection.
2031 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
2032 *** x-get-selection-value is renamed to gui-get-primary-selection.
2033 *** x-set-selection is renamed to gui-set-selection
2036 ** New function 'string-greaterp', which return the opposite result of
2040 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
2041 preserve the collation order as defined by the system's locale(1)
2042 environment. For the time being this is implemented for modern POSIX
2043 systems and for MS-Windows, for other systems they fall back to their
2044 counterparts 'string-lessp' and 'string-equal'.
2047 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
2048 The effect is that, on systems that use ls-lisp for Dired, the default
2049 sort order of the files in Dired is now different from what it was in
2050 previous versions of Emacs. In particular, the file names are sorted
2051 disregarding punctuation, accents, and diacritics, and letter case is
2052 ignored. For example, files whose name begin with a period will no
2053 longer appear near the beginning of the directory listing. If you
2054 want the old, locale-independent sorting, customize the new option
2055 'ls-lisp-use-string-collate' to the nil value.
2058 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
2059 if set to a non-nil value, causes the above 2 functions to ignore
2060 symbol and punctuation characters when collating strings. This
2061 emulates the behavior of modern Posix platforms when the locale's
2062 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
2063 MS-Windows doesn't support UTF-8 as codeset in its locales.
2066 ** New function 'alist-get', which is also a valid place (aka lvalue).
2069 ** New function 'funcall-interactively', which works like 'funcall'
2070 but makes 'called-interactively-p' treat the function as (you guessed it)
2071 called interactively.
2074 ** New function 'function-put' to use instead of 'put' for function properties.
2077 ** The new function 'bidi-find-overridden-directionality' allows you to
2078 find characters whose directionality was, perhaps maliciously,
2079 overridden by directional override control characters. Lisp programs
2080 can use this to detect potential phishing of URLs and other links that
2081 exploits bidirectional display reordering.
2084 ** The new function 'buffer-substring-with-bidi-context' allows you to
2085 copy a portion of a buffer into a different location while preserving
2086 the visual appearance both of the copied text and the text at
2087 destination, even when the copied text includes mixed bidirectional
2088 text and directional control characters.
2091 ** New properties that can be specified with 'declare':
2092 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
2093 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
2094 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
2098 ** New macro 'with-file-modes', for evaluating expressions with default file
2099 permissions set to temporary values (e.g., for creating private files).
2102 ** You can access the slots of structures using 'cl-struct-slot-value'.
2105 ** Function 'sort' can deal with vectors.
2108 ** Function 'system-name' now returns an updated value if the current
2109 system's name has changed or if the Emacs process has changed systems,
2110 and to avoid long waits it no longer consults DNS to canonicalize the
2111 name. The variable 'system-name' is now obsolete.
2114 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
2117 ** If 'pwd' is called with a prefix argument, insert the current default
2121 ** New functions return extended information about fonts and faces.
2124 *** The function 'font-info' now returns more details about a font.
2125 In particular, it now returns the average width of the font's
2126 characters, which can be used for geometry-related calculations.
2129 *** A new function 'default-font-width' returns the average width of a
2130 character in the current buffer's default font. If the default face
2131 is remapped (see 'face-remapping-alist'), the value for the remapped
2132 face is returned. This function complements the existing function
2133 'default-font-height'.
2136 *** New functions 'window-font-height' and 'window-font-width' return
2137 the height and average width of characters in a specified face and
2138 window. If FACE is remapped (see 'face-remapping-alist'), the
2139 function returns the information for the remapped face.
2142 *** A new function 'window-max-chars-per-line' returns the maximal
2143 number of characters that can be displayed on one line. If a face
2144 and/or window are provided, these values are used for the
2145 calculation. This function is different from 'window-body-width' in
2146 that it accounts for (i) continuation glyphs, (ii) the size of the
2147 font, and (iii) the specified window.
2150 ** New utilities in subr-x.el:
2151 *** New macros 'if-let' and 'when-let' allow defining bindings and to
2152 execute code depending whether all values are true.
2153 *** New macros 'thread-first' and 'thread-last' allow threading a form
2154 as the first or last argument of subsequent forms.
2157 ** Documentation strings now support quoting with curved single quotes
2158 in addition to the old style with grave accent and apostrophe. The
2159 new style looks better on today's displays. In the new Electric Quote
2160 mode, you can enter curved single quotes into documentation by typing
2161 grave accent and apostrophe. Outside Electric Quote mode, you can
2162 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
2163 works) by typing 'A-[' and 'A-]'. As described above under
2164 'text-quoting-style', the user can specify how to display doc string
2168 ** New function 'format-message' is like 'format' and also converts
2169 curved single quotes, grave accents and apostrophes as per
2170 'text-quoting-style'.
2173 ** show-help-function's arg is converted via substitute-command-keys
2174 before being passed to the function. Help strings, help-echo
2175 properties, etc. can therefore contain command key escapes and
2179 ** Time-related changes:
2181 *** Time conversion functions now accept an optional ZONE argument
2182 that specifies the time zone rules for conversion. ZONE is omitted or
2183 nil for Emacs local time, t for Universal Time, 'wall' for system wall
2184 clock time, or a string as in the TZ environment variable. The
2185 affected functions are 'current-time-string', 'current-time-zone',
2186 'decode-time', and 'format-time-string'. The function 'encode-time',
2187 which already accepted a simple time zone rule argument, has been
2188 extended to accept all the new forms.
2190 *** Incompatible change in the third argument of 'format-time-string'.
2191 Previously, any non-nil argument was interpreted as specifying Universal Time.
2192 This is no longer true; packages that want Universal Time should pass t
2193 as the third argument.
2195 *** Time-related functions now consistently accept numbers
2196 (representing seconds since the epoch) and nil (representing the
2197 current time) as well as the usual list-of-integer representation.
2198 Affected functions include 'current-time-string', 'current-time-zone',
2199 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
2200 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
2201 'time-to-days', and 'time-to-seconds'.
2203 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
2206 *** 'calendar-next-time-zone-transition', 'time-add', and
2207 'time-subtract' no longer return time values in the obsolete and
2208 undocumented integer-pair format. Instead, they return a list of two
2212 ** New function 'set-binary-mode' allows switching a standard stream
2213 of the Emacs process to binary I/O mode.
2216 ** The new function 'directory-name-p' can be used to check whether a file
2217 name (as returned from, for instance, 'file-name-all-completions') is
2218 a directory file name. It returns non-nil if the last character in
2219 the name is a directory separator character (forward slash on GNU and
2220 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2223 ** ASCII approximations to curved quotes are put in standard-display-table
2224 if the terminal cannot display curved quotes.
2227 ** Standard output and error streams now transliterate characters via
2228 standard-display-table, and encode output using locale-coding-system.
2229 To force a specific encoding, bind 'coding-system-for-write' to the
2230 coding-system of your choice when invoking functions like 'prin1' and
2234 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
2237 ** New possible value for 'system-type': 'nacl'.
2238 This is used by Google's Native Client (NaCl).
2240 ** Miscellaneous name change
2243 For consistency with the usual Emacs spelling, the Lisp variable
2244 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
2245 The old name should still work, as an obsolescent alias.
2247 ** Changes in Frame- and Window- Handling
2250 *** Emacs can now draw horizontal scroll bars on some platforms that
2251 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2252 Horizontal scroll bars are turned off by default.
2254 **** New function 'horizontal-scroll-bars-available-p' telling whether
2255 horizontal scroll bars are available on the underlying system.
2257 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
2258 bars on all existing and future frames.
2260 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
2261 scroll bars on the selected frame.
2263 **** New frame parameters 'horizontal-scroll-bars' and
2264 'scroll-bar-height' to set horizontal scroll bars and their height
2265 for individual frames and in 'default-frame-alist'.
2267 **** New functions 'frame-scroll-bar-height' and
2268 'window-scroll-bar-height' return the height of horizontal scroll
2269 bars on a specific frame or window.
2271 **** 'set-window-scroll-bars' now accepts five parameters where the last
2272 two specify height and type of the window's horizontal scroll bar.
2274 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
2277 **** New buffer-local variables 'horizontal-scroll-bar' and
2278 'scroll-bar-height'.
2281 *** New functions 'frame-geometry' and 'frame-edges' give access to a
2285 *** New functions 'mouse-absolute-pixel-position' and
2286 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
2290 *** The function 'window-edges' now accepts three additional arguments to
2291 retrieve body, absolute and pixel edges of the window.
2294 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
2295 'window-inside-absolute-pixel-edges' have been renamed to respectively
2296 'window-body-edges', 'window-body-pixel-edges' and
2297 'window-absolute-body-pixel-edges'. The old names are kept as aliases.
2300 *** New function 'window-absolute-pixel-position' to get the screen
2301 coordinates of a visible buffer position.
2304 *** The height of a frame's menu and tool bar are no longer counted in the
2305 frame's text height. This means that the text height stands only for
2306 the height of the frame's root window plus that of the echo area (if
2307 present). This was already the behavior for frames with external tool
2308 and menu bars (like in the Gtk builds) but has now been extended to all
2312 *** Frames now do not necessarily preserve the number of columns or lines
2313 they display when setting default font, menu bar, fringe width, or
2314 scroll bars. In particular, maximized and fullscreen frames are
2315 conceptually never resized if such settings change. For fullheight and
2316 fullwidth frames, the behavior may depend on the toolkit used.
2317 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
2318 setting default font, menu bar, fringe width, or scroll bars of a
2319 specific frame does not resize that frame in order to preserve the
2320 number of columns or lines it displays.
2323 *** New function 'window-preserve-size' allows you to preserve the size of
2324 a window without "fixing" it. It's supported by 'fit-window-to-buffer',
2325 'temp-buffer-resize-mode' and 'display-buffer'.
2328 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
2329 This displays the buffer in an existing frame other than the current
2330 frame, and allows the caller to specify a frame predicate to exclude
2334 *** New minor mode 'window-divider-mode' and options
2335 'window-divider-default-places', 'window-divider-default-bottom-width'
2336 and 'window-divider-default-right-width'.
2339 *** The window displaying the '*Completions*' buffer with minibuffer
2340 completion candidates is now shown at the bottom of the selected
2341 frame. The size of that window is always as large as required to
2342 display all the candidates, except when limited by the minimum size
2343 of the other windows on that frame; those other windows are resized
2344 to provide space for the '*Completions*' display. The Emacs manual
2345 describes how to customize 'display-buffer-alist' to get back the old
2346 behavior, see the node "Temporary Displays" there.
2349 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2350 Those features have been deprecated in Gtk+ for a long time.
2355 *** etags no longer qualifies class members by default.
2357 By default, 'etags' will not qualify class members for Perl and C-like
2358 object-oriented languages with their class names and namespaces, and
2359 will remove qualifications used explicitly in the code from the tag
2360 names it puts in TAGS files. This is so the etags.el back-end for
2361 'xref-find-definitions' is more accurate and produces less false
2364 Use --class-qualify (-Q) if you want the old default behavior of
2365 qualifying class members in C++, Java, Objective C, and Perl. Note
2366 that using -Q might make some class members become "unknown" to 'M-.'
2367 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
2368 qualified names by hand.
2371 *** New language Ruby
2373 Names of modules, classes, methods, functions, and constants are
2374 tagged. Overloaded operators are also tagged.
2378 Names of packages, functions, and types are tagged.
2381 *** Improved support for Lua
2383 Etags now tags functions even if the "function" keyword follows some
2384 whitespace at line beginning.
2387 * Changes in Emacs 25.1 on Non-Free Operating Systems
2390 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2391 This includes the makefile.w32-in files in various subdirectories, and
2392 the support files. The file nt/configure.bat now just tells the user
2393 to use the procedure described in nt/INSTALL, by running the Posix
2394 'configure' script in the top-level directory.
2397 ** Building Emacs for MS-Windows requires at least Windows XP
2398 or Windows Server 2003. The built binaries still run on all versions
2399 of Windows starting with Windows 9X.
2402 ** Emacs running on MS-Windows now supports the daemon mode.
2405 ** The byte counts in etags-generated TAGS files are now the same on
2406 MS-Windows as they are on other platforms.
2409 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2410 Pass '--without-ns' to configure to create an X11 build, the old default.
2413 ** OS X 10.5 or older is no longer supported.
2416 ** OS X on PowerPC is no longer supported.
2419 ** New variable 'ns-use-fullscreen-animation' controls animation for
2420 non-native NS fullscreen. The default is nil. Set to t to enable
2421 animation when entering and leaving fullscreen. For native OSX fullscreen
2425 ** The new function 'w32-application-type' returns the type of an
2426 MS-Windows application given the name of its executable program file.
2428 ** New variable 'w32-pipe-buffer-size'.
2429 It can be used to tune the size of the buffer of pipes created for
2430 communicating with subprocesses, when the program run by a subprocess
2431 exhibits unusual buffering behavior. Default is zero, which lets the
2432 OS use its default size.
2435 ----------------------------------------------------------------------
2436 This file is part of GNU Emacs.
2438 GNU Emacs is free software: you can redistribute it and/or modify
2439 it under the terms of the GNU General Public License as published by
2440 the Free Software Foundation, either version 3 of the License, or
2441 (at your option) any later version.
2443 GNU Emacs is distributed in the hope that it will be useful,
2444 but WITHOUT ANY WARRANTY; without even the implied warranty of
2445 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2446 GNU General Public License for more details.
2448 You should have received a copy of the GNU General Public License
2449 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2455 paragraph-separate: "[
\f]*$"