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 ** Faces in `minibuffer-prompt-properties' no longer overwrite properties
61 in the text in functions like `read-from-minibuffer', but instead are
62 added to the end of the face list. This allows users to say things
63 like `(read-from-minibuffer (propertize "Enter something: " 'face 'bold))'.
66 ** The new variable `extended-command-suggest-shorter' has been added
67 to control whether to suggest shorter `M-x' commands or not.
70 ** icomplete now respects `completion-ignored-extensions'.
73 ** Non-breaking hypens are now displayed with the `nobreak-hyphen'
74 face instead of the `escape-glyph' face.
77 ** `C-x h' (`mark-whole-buffer') will now avoid marking the prompt
81 ** `find-library' now takes a prefix argument to pop to a different
84 ** `find-library', `help-function-def' and `help-variable-def' now run
85 `find-function-after-hook'.
88 ** 'process-attributes' on Darwin systems now returns more information.
91 ** Several accessors for the value returned by 'file-attributes'
92 have been added. They are: 'file-attribute-type',
93 'file-attribute-link-number', 'file-attribute-user-id',
94 'file-attribute-group-id', 'file-attribute-access-time',
95 'file-attribute-modification-time',
96 'file-attribute-status-change-time', 'file-attribute-size',
97 'file-attribute-modes', 'file-attribute-inode-number', and
98 'file-attribute-device-number'.
101 ** The new function 'buffer-hash' computes compute a fast, non-consing
102 hash of a buffer's contents.
105 ** 'fill-paragraph' no longer marks the buffer as changed unless it
106 actually changed something.
109 ** The locale language name 'ca' is now mapped to the language
110 environment 'Catalan', which has been added.
113 ** 'align-regexp' has a separate history for its interactive argument.
114 'align-regexp' no longer shares its history with all other
115 history-less functions that use 'read-string'.
118 ** The networking code has been reworked so that it's more
119 asynchronous than it was (when specifying :nowait t in
120 'make-network-process'). How asynchronous it is varies based on the
121 capabilities of the system, but on a typical GNU/Linux system the DNS
122 resolution, the connection, and (for TLS streams) the TLS negotiation
123 are all done without blocking the main Emacs thread. To get
124 asynchronous TLS, the TLS boot parameters have to be passed in (see
125 the manual for details).
127 Certain process oriented functions (like 'process-datagram-address')
128 will block until socket setup has been performed. The recommended way
129 to deal with asynchronous sockets is to avoid interacting with them
130 until they have changed status to "run". This is most easily done
131 from a process sentinel.
133 ** 'make-network-process' and 'open-network-stream' sometimes allowed
134 :service to be an integer string (e.g., :service "993") and sometimes
135 required an integer (e.g., :service 993). This difference has been
136 eliminated, and integer strings work everywhere.
138 ** It is possible to disable attempted recovery on fatal signals.
140 Two new variables support disabling attempts to recover from stack
141 overflow and to avoid automatic auto-save when Emacs is delivered a
142 fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
143 will disable attempts to recover from C stack overflows; Emacs will
144 then crash as with any other fatal signal.
145 'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
146 disable attempts to auto-save the session and shut down in an orderly
147 fashion when Emacs receives a fatal signal; instead, Emacs will
148 terminate immediately. Both variables are non-'nil' by default.
149 These variables are for users who would like to avoid the small
150 probability of data corruption due to techniques Emacs uses to recover
154 ** A second dir-local file (.dir-locals-2.el) is now accepted.
155 See the variable 'dir-locals-file-2' for more information.
158 ** International domain names (IDNA) are now encoded via the new
159 puny.el library, so that one can visit web sites with non-ASCII URLs.
162 ** The new 'timer-list' command lists all active timers in a buffer,
163 where you can cancel them with the 'c' command.
166 ** The new function 'read-multiple-choice' prompts for multiple-choice
167 questions, with a handy way to display help texts.
170 * Editing Changes in Emacs 25.2
173 ** New bindings for 'query-replace-map'.
174 'undo', undo the last replacement; bound to 'u'.
175 'undo-all', undo all replacements; bound to 'U'.
178 * Changes in Specialized Modes and Packages in Emacs 25.2
183 *** Messages from CMake are now recognized.
188 *** In wdired, when editing files to contain slash characters,
189 the resulting directories are automatically created. Whether to do
190 this is controlled by the 'wdired-create-parent-directories' variable.
193 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
194 viewing HTML files and the like.
199 *** A new 's' command for switching to another eww buffer via the minibuffer.
202 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
203 with the 'o' command from 'image-map'.
206 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
207 whether to use the HTML-specified colors or not. The user can also
208 customize the 'shr-use-colors' variable.
211 *** Images that are being loaded are now marked with gray
212 "placeholder" images of the size specified by the HTML. They are then
213 replaced by the real images asynchronously, which will also now
214 respect width/height HTML specs (unless they specify widths/heights
215 bigger than the current window).
220 *** Images are automatically scaled before displaying based on the
221 'image-scaling-factor' variable (if Emacs supports scaling the images
225 *** Images inserted with 'insert-image' and related functions get a
226 keymap put into the text properties (or overlays) that span the
227 image. This keymap binds keystrokes for manipulating size and
228 rotation, as well as saving the image to a file. These commands are
229 also available in 'image-mode'.
232 *** A new library for creating and manipulating SVG images has been
233 added. See the "SVG Images" section in the lispref manual for
237 *** New setf-able function to access and set image parameters is
238 provided: 'image-property'.
241 ** The commands that add ChangeLog entries now prefer a VCS root directory
242 for the ChangeLog file, if none already exists. Customize
243 'change-log-directory-files' to nil for the old behavior.
246 ** Support for non-string values of 'time-stamp-format' has been removed.
251 *** 'message-use-idna' now defaults to t (because Emacs comes with
252 built-in IDNA support now).
255 *** The 'message-valid-fqdn-regexp' variable has been removed, since
256 there are now top-level domains added all the time. Message will no
257 longer warn about sending emails to top-level domains it hasn't heard
260 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
261 In 'visual-line-mode' it will look for the true beginning of a header
262 while in non-'visual-line-mode' it will move the point to the indented
268 *** New connection method "sg", which supports editing files under a
272 *** New connection method "doas" for OpenBSD hosts.
275 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
280 *** Support for completing attribute values and bang-rules using the
281 'completion-at-point' command.
284 ** Emacs now supports character name escape sequences in character and
285 string literals. The syntax variants \N{character name} and
286 \N{U+code} are supported.
289 ** Prog mode has some support for multi-mode indentation.
290 This allows better indentation support in modes that support multiple
291 programming languages in the same buffer, like literate programming
292 environments or ANTLR programs with embedded Python code.
294 A major mode can provide indentation context for a sub-mode through
295 the 'prog-indentation-context' variable. To support this, modes that
296 provide indentation should use 'prog-widen' instead of 'widen' and
297 'prog-first-column' instead of a literal zero. See the node
298 "Mode-Specific Indent" in the ELisp manual for more details.
302 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
308 *** The new function 'url-cookie-delete-cookie' can be used to
309 programmatically delete all cookies, or cookies from a specific
313 *** `url-retrieve-synchronously' now takes an optional timeout parameter.
316 *** The URL package now support HTTPS over proxies supporting CONNECT.
319 *** 'url-user-agent' now defaults to 'default', and the User-Agent
320 string is computed dynamically based on 'url-privacy-level'.
322 ** VC and related modes
325 *** The VC state indicator in the mode line now defaults to more
326 colorful faces to make it more obvious to the user what the state is.
327 See the 'vc-faces' customization group.
330 * New Modes and Packages in Emacs 25.2
333 * Incompatible Lisp Changes in Emacs 25.2
336 ** Resizing a frame no longer runs 'window-configuration-change-hook'.
337 Put your function on 'window-size-change-functions' instead.
339 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
340 mode to send the same escape sequences that xterm does. This makes
341 things like forward-word in readline work.
344 ** hideshow mode got four key bindings that are analogous to outline
345 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
347 ** The grep/rgrep/lgrep functions will now ask about saving files
348 before running. This is controlled by the 'grep-save-buffers'
352 * Lisp Changes in Emacs 25.2
354 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss.
356 ** Autoload files can be generated without timestamps,
357 by setting 'autoload-timestamps' to nil.
358 FIXME As an experiment, nil is the current default.
359 If no insurmountable problems before next release, it can stay that way.
361 ** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
365 ** 'gnutls-boot' now takes a parameter :complete-negotiation that says
366 that negotiation should complete even on non-blocking sockets.
369 ** New functions 'window-pixel-width-before-size-change' and
370 'window-pixel-height-before-size-change' support detecting which
371 window changed size when 'window-size-change-functions' are run.
374 ** New function 'display-buffer-reuse-mode-window' is an action function
375 suitable for use in 'display-buffer-alist'. For example, to avoid creating
376 a new window when opening man pages when there's already one, use
377 (add-to-list 'display-buffer-alist
378 '("\\`\\*Man .*\\*\\'" .
379 (display-buffer-reuse-mode-window
380 (inhibit-same-window . nil)
384 ** There is now a new variable 'flyspell-sort-corrections-function'
385 that allows changing the way corrections are sorted.
388 ** The new command 'fortune-message' has been added, which displays
389 fortunes in the echo area.
392 ** New function 'func-arity' returns information about the argument list
393 of an arbitrary function. This generalizes 'subr-arity' for functions
394 that are not built-in primitives. We recommend using this new
395 function instead of 'subr-arity'.
398 ** 'parse-partial-sexp' state has a new element. Element 10 is
399 non-nil when the last character scanned might be the first character
400 of a two character construct, i.e., a comment delimiter or escaped
401 character. Its value is the syntax of that last character.
404 ** 'parse-partial-sexp''s state, element 9, has now been confirmed as
405 permanent and documented, and may be used by Lisp programs. Its value
406 is a list of currently open parenthesis positions, starting with the
407 outermost parenthesis.
410 ** 'read-color' will now display the color names using the color itself
411 as the background color.
413 ** The function 'redirect-debugging-output' now works on platforms
414 other than GNU/Linux.
417 ** The new function 'string-version-lessp' compares strings by
418 interpreting consecutive runs of numerical characters as numbers, and
419 compares their numerical values. According to this predicate,
420 "foo2.png" is smaller than "foo12.png".
423 ** The new function 'char-from-name' converts a Unicode name string
424 to the corresponding character code.
427 ** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
428 Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
429 two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
430 ('sxhash-eql') on them will be the same.
433 ** Function 'sxhash' has been renamed to 'sxhash-equal' for
434 consistency with the new functions. For compatibility, 'sxhash'
435 remains as an alias to 'sxhash-equal'.
438 ** Time conversion functions that accept a time zone rule argument now
439 allow it to be OFFSET or a list (OFFSET ABBR), where the integer
440 OFFSET is a count of seconds east of Universal Time, and the string
441 ABBR is a time zone abbreviation. The affected functions are
442 'current-time-string', 'current-time-zone', 'decode-time',
443 'format-time-string', and 'set-time-zone-rule'.
446 * Changes in Emacs 25.2 on Non-Free Operating Systems
448 ** Intercepting hotkeys on Windows 7 and later now works better.
449 The new keyboard hooking code properly grabs system hotkeys such as
450 Win-* and Alt-TAB, in a way that Emacs can get at them before the
451 system. This makes the 'w32-register-hot-key' functionality work
452 again on all versions of MS-Windows starting with Windows 7. On
453 Windows NT and later you can now register any hotkey combination. (On
454 Windows 9X, the previous limitations, spelled out in the Emacs manual,
457 ** `convert-standard-filename' no longer mirrors slashes on MS-Windows.
458 Previously, on MS-Windows this function converted slash characters in
459 file names into backslashes. It no longer does that.
462 * Installation Changes in Emacs 25.1
465 ** Building Emacs now requires C99 or later.
468 ** Building Emacs now requires GNU make, version 3.81 or later.
471 ** New configure option --with-cairo.
472 This builds Emacs with Cairo drawing. As a side effect, it provides
473 support for built-in printing, when Emacs was built with GTK+.
474 Cairo drawing is an experimental feature in Emacs, and subject to
475 change in future releases.
478 ** New configure option --with-modules.
479 This enables support for loading dynamic modules; see below.
482 ** By default, Emacs no longer works on IRIX. We expect that Emacs
483 users are not affected by this, as SGI stopped supporting IRIX in
484 December 2013. If you are affected, please send a bug report. You
485 should be able to work around the problem either by porting the Emacs
486 undumping code to GCC under IRIX, or by configuring --with-wide-int,
487 or by sticking with Emacs 24.4.
490 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
491 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
492 since Emacs 24.4, and the other variants were undocumented and were
493 obstacles to maintenance and development. GC_MARK_STACK and its
494 related symbols have been removed from the C internals.
497 ** 'configure' now prefers gnustep-config when configuring GNUstep.
498 If gnustep-config is not available, the old heuristics are used.
501 ** 'configure' now prefers inotify to gfile for file notification,
502 unless gfile is explicitly requested via --with-file-notification='gfile'.
505 ** 'configure' detects the kqueue file notification library on *BSD
506 and Mac OS X machines.
509 ** The configure option '--with-pkg-config-prog' has been removed.
510 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
513 ** The configure option '--with-mmdf' has been removed.
514 It was no longer useful, as it relied on libraries that are no longer
515 supported, and its presence led to confusion during configuration.
516 This affects only the 'movemail' utility; Emacs itself can still
517 process MMDF-format files as before.
520 ** The configure option '--enable-silent-rules' is now the default,
521 and silent rules are now quieter. To get the old behavior where
522 'make' chatters a lot, configure with '--disable-silent-rules' or
523 build with 'make V=1'.
526 ** The configure option '--with-gameuser' now allows you to specify a
527 group instead of a user if its argument is prefixed by ':' (a colon).
528 This will cause the game score files in ${localstatedir}/games/emacs
529 to be owned by that group, and the helper program for updating them to
530 be installed setgid. The option now defaults to the 'games' group.
533 ** The 'grep-changelog' script (and its manual page) are no longer included.
534 It has no particular connection to Emacs and has not changed in years,
535 so if you want to use it, you can always take a copy from an older Emacs.
538 ** Emacs 25 comes with a new set of icons.
539 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
540 The old Emacs logo icons are available as 'emacs23.png' in the same location.
543 ** New make target 'check-expensive' to run additional tests.
544 This includes all tests which run via "make check", plus additional
545 tests which take more time to perform.
548 * Startup Changes in Emacs 25.1
551 ** When Emacs is given a file as a command line argument and
552 'initial-buffer-choice' is non-nil, display both the file and
553 'initial-buffer-choice'. When Emacs is given more than one file and
554 'initial-buffer-choice' is non-nil, show 'initial-buffer-choice'
555 and *Buffer List*. This makes Emacs convenient to use from the
556 command line when 'initial-buffer-choice' is non-nil.
559 ** The value of 'initial-scratch-message' is now treated as a doc string
560 and can contain escape sequences for command keys, quotes, and the like.
563 ** The default height of GUI frames was enlarged.
564 This is so there's enough space in the initial window to display the
565 optional text about recovering crashes sessions, without losing the
566 splash image display.
569 * Changes in Emacs 25.1
572 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
573 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
574 xwidget support, you can access the embedded webkit browser with 'M-x
575 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
576 browser. The buffer will have a new mode, 'xwidget-webkit-mode'
577 (similar to 'image-mode'), which supports the webkit widget.
580 *** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
581 'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
582 'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
583 'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
584 'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
585 'xwidget-webkit-scroll-up'.
588 ** Emacs can now load shared/dynamic libraries (modules).
589 A dynamic Emacs module is a shared library that provides additional
590 functionality for use in Emacs Lisp programs, just like a package
591 written in Emacs Lisp would. The functions 'load', 'require',
592 'load-file', etc. were extended to load such modules, as they do with
593 Emacs Lisp packages. The new variable 'module-file-suffix' holds the
594 system-dependent value of the file-name extension ('.so' on Posix
595 hosts) of the module files.
597 A module should export a C-callable function named
598 'emacs_module_init', which Emacs will call as part of the call to
599 'load' or 'require' which loads the module. It should also export a
600 symbol named 'plugin_is_GPL_compatible' to indicate that its code is
601 released under the GPL or compatible license; Emacs will refuse to
602 load modules that don't export such a symbol.
604 If a module needs to call Emacs functions, it should do so through the
605 API defined and documented in the header file 'emacs-module.h'. Note
606 that any module that provides Lisp-callable functions will have to use
607 Emacs functions such as 'fset' and 'funcall', in order to register its
608 functions with the Emacs Lisp interpreter.
610 Modules can create 'user-ptr' Lisp objects that embed pointers to C
611 structs defined by the module. This is useful for keeping around
612 complex data structures created by a module, to be passed back to the
613 module's functions. User-ptr objects can also have associated
614 "finalizers" -- functions to be run when the object is GC'ed; this is
615 useful for freeing any resources allocated for the underlying data
616 structure, such as memory, open file descriptors, etc. A new
617 predicate 'user-ptrp' returns non-nil if its argument is a 'user-ptr'
620 Loadable modules in Emacs are an experimental feature, and subject to
621 change in future releases. For that reason, their support is disabled
622 by default, and must be enabled by using the '--with-modules' option
626 ** Network security (TLS/SSL certificate validity and the like) is
627 added via the new Network Security Manager (NSM) and controlled via
628 the 'network-security-level' variable.
631 ** C-h l now also lists the commands that were run.
634 ** x-select-enable-clipboard is renamed select-enable-clipboard
635 and x-select-enable-primary is renamed select-enable-primary.
636 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
637 name it), with the proviso that on some systems (e.g. Windows)
638 select-enable-primary is ineffective since the system doesn't
639 have the equivalent of a primary selection.
642 ** New option 'switch-to-buffer-in-dedicated-window' allows you to
643 customize how 'switch-to-buffer' proceeds interactively when the
644 selected window is strongly dedicated to its buffer.
647 ** The option 'even-window-heights' has been renamed to
648 'even-window-sizes' and now handles window widths as well.
651 ** terpri gets an optional arg ENSURE to conditionally output a newline.
654 ** 'insert-register' now leaves point after the inserted text
655 when called interactively. A prefix argument toggles this behavior.
658 ** The new variable 'term-file-aliases' replaces some files from lisp/term.
659 The function 'tty-run-terminal-initialization' consults this variable
660 when deciding what terminal-specific initialization code to run.
663 ** New variable 'system-configuration-features', listing some of the
664 main features that Emacs was compiled with. This is mainly intended
665 for use in Emacs bug reports.
668 ** A password is now hidden also when typed in batch mode. Another
669 hiding character but the default '.' can be used by let-binding the
670 variable 'read-hide-char'.
673 ** The Emacs pseudo-random number generator can be securely seeded.
674 On system where Emacs can access the system entropy or some other
675 cryptographically secure random stream, it now uses that when 'random'
676 is called with its argument 't'. This allows cryptographically strong
677 random values; in particular, the Emacs server now uses this facility
678 to produce its authentication key.
681 ** New input methods: 'tamil-dvorak' and 'programmer-dvorak'.
684 * Editing Changes in Emacs 25.1
687 ** M-x suggests shorthands and ignores obsolete commands for completion.
692 *** Successive single-char deletions are collapsed in the undo-log just like
693 successive char insertions. Which commands invoke this behavior is
694 controlled by the new 'undo-auto-amalgamate' function. See the node
695 "Undo" in the ELisp manual for more details.
698 *** The heuristic used to insert 'undo-boundary' after each command
699 has changed, so that if a command causes changes in more than just the
700 current buffer, Emacs now calls 'undo-boundary' in every buffer
701 affected by the command.
704 ** New command 'comment-line' bound to 'C-x C-;'.
706 ** New and improved facilities for inserting Unicode characters
709 *** Unicode names entered via C-x 8 RET now use substring completion by default.
712 *** C-x 8 now has shorthands for several chars, such as U+2010
713 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH). As
714 before, you can type C-x 8 C-h to list shorthands.
717 *** New minor mode electric-quote-mode for using curved quotes as you
718 type. See also the new variable 'text-quoting-style'.
721 ** New minor mode global-eldoc-mode is enabled by default.
724 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
725 Bracketed paste mode causes text terminals to wrap pasted text in special
726 escape sequences that allow Emacs to tell the difference between text
727 you type and text you paste from other applications. Emacs then
728 avoids interpreting each character in the pasted text as it does with
729 keyboard input, which results in a paste experience similar to that
730 under a window system, and significant performance improvements when
731 pasting large amounts of text.
733 Bracketed paste mode is disabled by default, so Emacs automatically
734 enables it at startup if the terminal supports it.
737 ** Emacs now supports the latest version of the UBA.
738 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
739 was updated to support all the latest additions and changes introduced
740 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
741 This includes full support for directional isolates and the
742 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
746 ** You can access 'mouse-buffer-menu' (C-down-mouse-1) using C-f10.
749 ** New buffer-local 'electric-pair-local-mode'.
752 ** New variable 'fast-but-imprecise-scrolling' inhibits
753 fontification during full screen scrolling operations, giving less
754 hesitant operation during auto-repeat of C-v, M-v at the cost of
755 possible inaccuracies in the end position.
758 ** New documentation command 'describe-symbol'.
759 Works for functions, variables, faces, etc. It is bound to 'C-h o' by
763 ** New function 'custom-prompt-customize-unsaved-options' checks for
764 unsaved customizations and prompts user to customize (if found). It
765 is intended for adding to 'kill-emacs-query-functions'.
768 ** The old 'C-x w' bindings in hi-lock-mode are officially deprecated
769 in favor of the global 'M-s h' bindings introduced in Emacs-23.1.
770 They'll disappear soon.
773 * Changes in Specialized Modes and Packages in Emacs 25.1
778 *** New command 'checkdoc-package-keywords' checks if the
779 current package keywords are recognized. Set the new option
780 'checkdoc-package-keywords-flag' to non-nil to make
781 'checkdoc-current-buffer' call this function automatically.
784 *** New function 'checkdoc-file' checks for style errors.
785 It's meant for use together with 'compile':
786 emacs -batch --eval "(checkdoc-file \"subr.el\")"
791 *** The desktop format version has been upgraded from 206 to 208.
792 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
793 cannot read a version 208 desktop. To upgrade your desktop file, you
794 must explicitly request the upgrade, by C-u M-x desktop-save. You are
795 recommended to do this as soon as you have firmly upgraded to Emacs
796 25.1 (or later). Should you ever need to downgrade your desktop file
797 to version 206, you can do this with C-u C-u M-x desktop-save.
800 ** New function 'bookmark-set-no-overwrite' bound to C-x r M.
801 It raises an error if a bookmark of that name already exists,
802 unlike 'bookmark-set' which silently updates an existing bookmark.
807 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
808 now control how mm-* functions fetch and display images in an HTML
809 message. Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
810 for that purpose, i.e., binds mm-html- variables with those gnus-
811 variables, but other packages do not have to bind gnus- variables now.
814 *** 'mm-inline-text-html-with-images' has been removed.
815 Use 'mm-html-inhibit-images' instead. Note that the value is opposite
821 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
822 GnuTLS encryption functions if possible.
827 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
828 the ordering of object keys by default.
831 *** New commands 'json-pretty-print-ordered' and
832 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
833 object keys sorted alphabetically.
835 ** Prettify Symbols mode
838 *** Prettify Symbols mode supports custom composition predicates. By
839 overriding the default 'prettify-symbols-compose-predicate', modes can
840 specify in which contexts a symbol may be displayed as some Unicode
841 character. 'prettify-symbols-default-compose-p' is the default which
842 is suitable for most programming languages such as C or Lisp (but not
846 *** Symbols can be unprettified while point is inside them.
847 New variable 'prettify-symbols-unprettify-at-point' configures this.
849 ** Enhanced xterm support
852 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
853 This variable tells Emacs which advanced capabilities are available in
854 the xterm terminal emulator used to display Emacs text-mode frames.
855 The default is to check each capability, and use it if available.
856 (This variable was introduced in Emacs 24.1, but was not announced in
860 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
861 in the surrounding GUI (using the OSC-52 escape sequence). This only works
862 if your xterm supports it and enables the 'allowWindowOps' options (disabled
863 by default at least in Debian, for security reasons).
865 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
866 escape sequence) if your xterm has the feature enabled but for that you
867 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
870 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
873 ** The way to turn on and off 'save-place' mode has changed.
874 It is no longer sufficient to load the saveplace library and set
875 'save-place' non-nil. Instead, use the two new minor modes:
876 'save-place-mode' turns on saving last place in every file, and
877 'save-place-local-mode' does that only for the file in whose buffer it
878 is invoked. The 'save-place' variable is now an obsolete alias for
879 'save-place-mode', which replaces it, and 'toggle-save-place' is an
880 obsolete alias for the new 'save-place-local-mode' command.
885 *** ERC can now hide message types by network or channel.
886 'erc-hide-list' will hide all messages of the specified type, while
887 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
888 specified message types for the respective specified targets.
891 *** Reconnection is now asynchronous.
894 *** Nick completion is now case-insensitive again after inadvertently
895 being made case-sensitive in Emacs 24.2.
900 *** New commands, key binds, and menu items.
902 **** '<' and '>' for navigating previous and next tracks in playlist
904 **** New play/pause command 'mpc-toggle-play' bound to 's'
906 **** 'g' bound to new command 'mpc-seek-current' will navigate current
909 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
910 toggling playback modes.
913 *** Now supports connecting to a UNIX domain socket.
916 *** Looks at more image file names to use as album art.
917 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
918 (XP) in addition to cover.jpg.
921 *** Searches in more locations for MPD configuration files.
922 MPD supports the XDG base directory specification since version 0.17.6.
927 *** 'midnight-mode' is now a proper minor mode.
930 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
935 *** New "external" package status.
936 An external package is any installed package that's not built-in and
937 not from 'package-user-dir', which usually means it's from an entry in
938 'package-directory-list'. They are treated much like built-in
939 packages, in that they cannot be deleted through the package menu and
940 are not considered for upgrades.
942 The effect is that a user can manually place a specific version of a
943 package inside 'package-directory-list' and the package menu will
947 *** If a package is available on multiple archives and one has higher
948 priority (as per 'package-archive-priorities') only that one is
949 listed. This can be configured with 'package-menu-hide-low-priority'.
952 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
953 This includes the above-mentioned low-priority packages, as well as
954 available packages whose version is lower than the currently installed
955 version (which were previously impossible to display).
956 This allows users to downgrade a package if a lower version is
960 *** When filtering the package menu, keywords starting with "arc:" or
961 "status:" represent package archive or status, respectively, instead
965 *** Most functions which involve downloading information now take an
966 ASYNC argument. If it is non-nil, package.el performs the download(s)
970 *** New variable 'package-menu-async' controls whether the
971 package-menu uses asynchronous downloads.
974 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
975 This follows the same rules as installing from a .tar file, except the
976 -pkg file is optional.
979 *** Packages which are dependencies of other packages cannot be deleted.
980 The FORCE argument to 'package-delete' overrides this.
983 *** New custom variable 'package-selected-packages' tracks packages
984 which were installed by the user (as opposed to installed as
985 dependencies). This variable can also be manually customized.
988 *** New command 'package-install-selected-packages' installs all
989 packages from 'package-selected-packages' which are currently missing.
992 *** 'package-install' function now takes a DONT-SELECT argument. If
993 this function is called interactively or if DONT-SELECT is nil, add the
994 package being installed to 'package-selected-packages'.
997 *** New command 'package-autoremove' removes all packages which were
998 installed strictly as dependencies but are no longer needed.
1003 When you invoke 'shell' interactively, the *shell* buffer will now
1004 display in a new window. However, you can customize this behavior via
1005 the 'display-buffer-alist' variable. For example, to get
1006 the old behavior -- *shell* buffer displays in current window -- use
1007 (add-to-list 'display-buffer-alist
1008 '("^\\*shell\\*$" . (display-buffer-same-window))).
1012 *** The ':protection' slot option is not obeyed any more.
1014 *** The 'newname' argument to constructors is optional&deprecated.
1015 If you need your objects to be named, do it by inheriting from 'eieio-named'.
1017 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
1019 *** The <class> variables are declared obsolete.
1021 *** The <initarg> variables are declared obsolete.
1023 *** defgeneric and defmethod are declared obsolete.
1024 Use the equivalent facilities from cl-generic.el instead.
1026 *** 'constructor' is now an obsolete alias for 'make-instance'.
1027 --- 'pcase' accepts a new UPattern 'eieio'.
1032 *** New command 'ido-bury-buffer-at-head' bound to C-S-b
1033 Bury the buffer at the head of 'ido-matches', analogous to how C-k
1034 kills the buffer at head.
1037 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
1038 meaning, and the list is restricted to those elements that do not
1039 match the current input.
1044 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
1045 The new commands 'next-line-or-history-element' and
1046 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
1047 minibuffer, allow by-line movement through minibuffer history,
1048 similarly to an ordinary buffer. Only when point moves over
1049 the bottom/top of the minibuffer it goes to the next/previous history
1050 element. 'M-p' and 'M-n' still move directly to previous/next history
1053 ** Search and Replace
1056 *** 'isearch' and 'query-replace' can now perform character folding in matches.
1057 This is analogous to case folding, but instead of disregarding case
1058 variants, it disregards wider classes of distinctions between similar
1059 characters. (Case folding is a special case of character folding.)
1060 This means many characters in the search string will match entire
1061 groups of characters instead of just themselves.
1063 For instance, the ASCII double quote character " will match all
1064 variants of double quotes, and the letter 'a' will match all of its
1065 accented cousins, even those composed of multiple characters, as well
1066 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
1069 Character folding is enabled by customizing 'search-default-mode' to
1070 the value 'character-fold-to-regexp'. You can also toggle character
1071 folding in the middle of a search by typing 'M-s ''.
1073 'query-replace' honors character folding if the new variable
1074 'replace-character-fold' is customized to a non-nil value.
1077 *** New user option 'search-default-mode'.
1078 This option specifies the default mode for Isearch. The default
1079 value, nil specifies that Isearch does literal searches (however,
1080 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
1081 as in previous Emacs versions).
1084 *** New function 'character-fold-to-regexp' can be used
1085 by searching commands to produce a regexp matching anything that
1086 character-folds into STRING.
1089 *** The new M-s M-w key binding uses eww to search the web for the
1090 text in the region. The search engine to use for this is specified by
1091 the customizable variable 'eww-search-prefix'.
1094 *** Query-replace history is enhanced.
1095 When query-replace reads the FROM string from the minibuffer, typing
1096 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
1097 and TO are the original text and its replacement, and SEP is an arrow
1098 string defined by the new variable 'query-replace-from-to-separator'.
1099 To select a prior replacement, type 'M-p' until the desired
1100 replacement appears in the minibuffer, and then exit the minibuffer by
1105 *** If 'quick-calc' is called with a prefix argument, insert the
1106 result of the calculation into the current buffer.
1109 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
1110 this you can tell Edebug not to stop at the start of the first
1111 instrumented function.
1116 *** New minor mode 'global-eldoc-mode'
1117 It is turned on by default, and affects '*scratch*' and other buffers
1118 whose major mode supports Emacs Lisp.
1121 *** 'eldoc-documentation-function' now defaults to 'ignore'
1124 *** 'describe-char-eldoc' displays information about character at point,
1125 and can be used as a default value of 'eldoc-documentation-function'. It is
1126 useful when, for example, one needs to distinguish various spaces - e.g.,
1127 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
1128 using mono-spaced font.
1133 *** HTML can now be rendered using variable-width fonts.
1136 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
1137 whether to use variable-pitch fonts or not. The user can also
1138 customize the 'shr-use-fonts' variable.
1141 *** A new command 'R' ('eww-readable') will try do identify the main
1142 textual parts of a web page and display only that, leaving menus and
1143 the like off the page.
1146 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
1147 toggle the paragraph direction between left-to-right and right-to-left.
1150 *** You can now use several eww buffers in parallel by renaming eww
1151 buffers you want to keep separate.
1154 *** Partial state of the eww buffers (the URIs and the titles of the
1155 pages visited) is now preserved in the desktop file.
1158 *** 'eww-after-render-hook' is now called after eww has rendered
1159 the data in the buffer.
1162 *** The 'eww-reload' command now takes a prefix to not reload via
1163 the net, but just use the local copy of the HTML.
1166 *** The DOM shr and eww uses has been changed to the general Emacs
1167 xml.el/libxml2 DOM, and a new package dom.el has been added to
1168 interact with this DOM. See the Emacs Lisp manual for interface
1172 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
1175 *** The new 'S' command will list all eww buffers, and allow managing
1179 *** https pages with valid certificates have headers marked in green, while
1180 invalid certificates are marked in red.
1185 *** text/html messages that contain inline image parts will be
1186 transformed into multipart/related messages before sending.
1189 ** In Show Paren Mode, a parenthesis can be highlighted when point
1190 stands inside it, and certain parens can be highlighted when point is
1191 at BOL or EOL, or in whitespace there. To enable these, customize,
1192 respectively, 'show-paren-when-point-inside-paren' or
1193 'show-paren-when-point-in-periphery'.
1196 ** If gpg2 exists on the system, it is now used as the default value
1197 of 'epg-gpg-program' (instead of gpg).
1202 *** Strings after ':documentation' are highlighted as docstrings.
1203 This enhances Lisp mode fontification to handle documentation of the
1204 form '(:documentation "the doc string")' used in Common Lisp code for
1205 CLOS class and slot documentation.
1207 ** Rectangle editing
1210 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
1213 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
1214 *** 'string-rectangle' provides on-the-fly preview of the result.
1217 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
1218 These should be used in preference to 'font-lock-fontify-buffer' when
1222 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
1223 to 'minibuffer-setup-hook'.
1225 If the first argument of the macro is of the form '(:append FUN)',
1226 then FUN will be appended to 'minibuffer-setup-hook', instead of
1231 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
1234 *** 'pcase' accepts the new UPattern 'cl-struct'.
1236 ** Calendar and diary
1239 *** The default 'diary-file' is now located in .emacs.d.
1242 *** New commands to insert diary entries with Chinese dates:
1243 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
1244 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
1247 *** The calendar can now list and mark diary entries with Chinese dates.
1248 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
1251 *** The option 'calendar-mode-line-format' can now be nil,
1252 which means to do nothing special with the mode line in calendars.
1255 *** New option 'calendar-weekend-days'.
1256 The option customizes which day headers receive the
1257 'calendar-weekend-header' face.
1260 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
1263 *** Many items obsolete since at least version 23.1 have been removed.
1264 The majority were function/variable/face aliases, too numerous to list here.
1267 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
1268 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
1270 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
1272 **** Macro 'calendar-for-loop'.
1274 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
1276 **** The nil and list forms of 'diary-display-function'.
1279 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
1280 If the output of ERT tests in batch mode execution can be saved to a
1281 log file, then it can be passed as an argument to the above function
1282 to produce a neat summary.
1285 ** New js.el option 'js-indent-first-init'.
1290 ** Info mode now displays symbol names in fixed-pitch font.
1291 If you want to get the old behavior back, customize the 'Info-quoted'
1292 face to use the same definitions as the default face.
1295 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
1298 *** 'info-display-manual' can now be given a prefix argument which (any
1299 non-nil value) directs the command to limit the completion
1300 alternatives to currently visited manuals.
1303 ** ntlm.el has support for NTLM2.
1308 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
1309 to delete or undelete multiple messages.
1312 *** Rmail can now render HTML mail messages if your Emacs was built with
1313 libxml2 or if you have the Lynx browser installed. By default, Rmail
1314 will display the HTML version of a mail message that has both HTML and
1315 plain text parts, if display of HTML email is possible; customize the
1316 'rmail-mime-prefer-html' option to 'nil' if you don't want that.
1319 *** In the commands that make summaries by subject, recipients, or senders,
1320 you can no longer use commas to separate regular expressions.
1323 ** SES now supports local printer functions; see 'ses-define-local-printer'.
1325 ** Shell-script Mode
1327 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
1328 specify the type of shell in use (bash, csh, etc).
1331 *** New value 'always' for 'sh-indent-after-continuation'.
1332 This provides old-style ("dumb") indentation of continued lines.
1333 See the doc string of 'sh-indent-after-continuation' for details.
1337 *** Fatal TLS errors are now silent by default.
1340 *** If Emacs isn't built with TLS support, an external TLS-capable
1341 program is used instead. This program used to be run in --insecure
1342 mode by default, but has now changed to be secure instead, and will
1343 fail if you try to connect to non-verifiable hosts. This is
1344 controlled by the 'tls-program' variable.
1349 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1350 When 'url-handler-mode' is enabled, file operations for these
1351 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1354 *** The URL package allows customizing the 'url-user-agent' string.
1355 The new 'url-user-agent' variable can be customized to be a string or
1359 *** The new interface variable 'url-request-noninteractive' can be used
1360 to specify that we're running in a noninteractive context, and that
1361 we should not be queried about things like TLS certificate validity.
1364 *** 'url-mime-accept-string' can now be used as in "interface"
1365 variable, meaning you can bind it around an 'url-retrieve' call.
1368 *** If URL is used with a https connection, the first callback argument
1369 plist will contain a :peer element that has the output of
1370 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
1375 *** New connection method "afp", which allows you to access Mac OS X
1376 volumes via the Apple Filing Protocol.
1379 *** New connection method "nc", which allows you to access dumb
1383 *** Method-specific parameters can be overwritten now with variable
1384 'tramp-connection-properties'.
1387 *** Handler for 'file-notify-valid-p' for remote machines that support
1388 filesystem notifications.
1393 *** New user variable 'sql-default-directory' enables remote
1394 connections using Tramp.
1397 *** New command 'sql-send-line-and-next'.
1398 This command, bound to 'C-c C-n' by default, sends the current line to
1399 the SQL process and advances to the next line, skipping whitespace and
1403 *** Added support for Vertica SQL.
1405 ** VC and related modes
1408 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
1409 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1410 (undocumented) command vc-hg-push now behaves slightly differently.
1413 *** The new command vc-region-history shows the log+diff of the active region.
1416 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
1417 This command is useful when you perform version control commands
1418 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1419 back-end for the buffer's file, or remove it from version control.
1422 *** New option 'vc-annotate-background-mode' controls whether
1423 the color range from 'vc-annotate-color-map' is applied to the
1424 background or to the foreground.
1427 *** New options for customizing encoding of Git commit log messages.
1428 The new user options 'vc-git-commits-coding-system' and
1429 'vc-git-log-output-coding-system' specify the encoding of log messages
1430 sent to Git when committing, and the decoding of log messages read
1431 from Git history commands. These options default to UTF-8; if
1432 customized, they should be consistent with the Git config variables
1433 i18n.commitEncoding and i18n.logOutputEncoding.
1434 ('vc-git-commits-coding-system' existed previously, but was a
1435 variable, not a user option.)
1438 *** 'compare-windows' now compares text with the most recently selected window
1439 instead of the next window. If you want the previous behavior of
1440 comparing with the next window, customize the new option
1441 'compare-windows-get-window-function' to the value
1442 'compare-windows-get-next-window'.
1445 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
1446 replace the face 'compare-windows', which is now an obsolete alias for
1447 'compare-windows-added'.
1450 *** The VC state indicator in the mode line now has different faces
1451 corresponding to each of the possible states. See the 'vc-faces'
1452 customization group.
1455 *** 'log-edit-insert-changelog' converts "(tiny change)" to
1456 "Copyright-paperwork-exempt: yes". Set 'log-edit-rewrite-tiny-change'
1457 nil to disable this.
1460 *** vc-mcvs.el has been removed.
1463 ** VHDL mode now supports VHDL'08.
1468 *** Decimal display mode uses "," groups, so it's more
1469 fitting for use in money calculations
1472 *** Factorial works with non-integer inputs.
1477 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1478 macro argument expansion, interactive macro evaluation and automatic
1479 scanning of #define'd symbols.
1482 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
1483 result of evaluating a macro.
1486 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
1487 all defined symbols in 'hide-ifdef-env'.
1490 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
1491 file name patterns. Defaults to files whose extension is one of '.h',
1492 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
1495 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
1496 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1497 (This could happen when an idempotent header file is visited again,
1498 when its guard symbol is already defined.) Defaults to 't'.
1501 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
1502 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1503 looking for macro definitions. By default, no symbols are ignored.
1508 *** New custom variable 'tex-print-file-extension' to help users who
1509 use PDF instead of DVI.
1512 *** TeX mode now supports Prettify Symbols mode. When enabling
1513 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1514 many other math macros are displayed using unicode characters.
1517 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
1518 By default, 32 consecutive spaces or four consecutive TABs are
1519 considered to be too deep, but the new variable
1520 'whitespace-big-indent-regexp' can be customized to change that.
1523 ** New options in 'tildify-mode'.
1524 New options 'tildify-space-string', 'tildify-pattern', and
1525 'tildify-foreach-region-function' variables make
1526 'tildify-string-alist', 'tildify-pattern-alist', and
1527 'tildify-ignored-environments-alist' variables (as well as a few
1528 helper functions) obsolete.
1531 ** New package Xref replaces Etags's front-end and UI
1533 The new package Xref provides a generic framework and new commands to
1534 find and move to definitions of functions, macros, data structures
1535 etc., as well as go back to the location where you were before moving
1536 to a definition. It supersedes and obsoletes many Etags commands,
1537 while still using the etags.el code that reads the TAGS tables as one
1540 The command 'xref-find-definitions' replaces 'find-tag' and provides
1541 an interface to pick one definition among several.
1542 'tags-loop-continue' is now unbound. 'xref-pop-marker-stack' replaces
1543 'pop-tag-mark', but has a keybinding ('M-,') different from the one
1544 'pop-tag-mark' used.
1546 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
1547 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
1548 'xref-find-apropos' replaces 'find-tag-regexp'.
1550 As a result of this, the following commands are now obsolete:
1551 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
1554 'tags-loop-continue' is not obsolete because it's still useful in
1555 'tags-search' and 'tags-query-replace', for which there are no direct
1559 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
1560 replaced by xref-style commands, see the "Dired" section below.
1565 'find-tag-marker-ring-length' is now an obsolete alias for
1566 'xref-marker-ring-length'. 'find-tag-marker-ring' is now an obsolete
1567 alias for a private variable. 'xref-push-marker-stack' and
1568 'xref-pop-marker-stack' should be used instead to manipulate the stack
1569 of searches for definitions.
1572 *** 'xref-find-definitions' and 'describe-function' now display
1573 information about mode local overrides (defined by cedet/mode-local.el
1574 'define-overloadable-function' 'define-mode-local-overrides').
1576 The framework's Lisp API is still experimental and can change in major,
1577 backward-incompatible ways.
1580 ** New package Project
1582 The new package Project provides generic infrastructure for dealing
1583 with projects. The main commands included in it are
1584 'project-find-file' and 'project-find-regexp'.
1586 The Lisp API of this package is still experimental.
1589 EUDC's LDAP backend has been improved.
1592 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1595 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1596 subprocess instead of on the command line.
1599 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1600 need to configure this manually anymore.
1603 *** The LDAP configuration section of EUDC's manual has been
1606 There have also been customization changes.
1609 *** New custom variable 'eudc-server-hotlist' to allow specifying
1610 multiple EUDC servers in init file.
1613 *** Custom variable 'eudc-inline-query-format' defaults to completing
1614 on email and firstname instead of surname.
1617 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
1618 to avoid interfering with the kill ring.
1621 *** Custom variable 'eudc-inline-expansion-format' defaults to
1622 "Firstname Surname <mail-address>".
1625 *** Custom variable 'eudc-options-file' defaults to
1626 "~/.emacs.d/eudc-options".
1629 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
1630 allow overriding the regular expression that recognizes the ldapsearch
1631 command line's password prompt.
1634 EUDC's BBDB backend now supports BBDB 3.
1637 EUDC's PH backend (eudcb-ph.el) is obsolete.
1642 *** The new built-in command 'clear' can scroll window contents out of sight.
1643 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1646 *** New buffer syntax '#<buffer-name>', which is equivalent to
1647 '#<buffer buffer-name>'. This shorthand makes interacting with
1648 buffers from eshell more convenient. Custom variable
1649 'eshell-buffer-shorthand', which has been broken for a while, has been
1653 *** By default, eshell "visual" program buffers (created by
1654 'eshell-visual-commands' and similar custom vars) are no longer killed
1655 when their processes die. This fixes issues with short-lived commands
1656 and makes visual programs more useful in general. For example, if
1657 "git log" is a visual command, it will always show the visual command
1658 buffer, even if the "git log" process dies. For the old behavior,
1659 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
1664 *** Support for the Google Chrome web browser.
1667 *** Support for the Conkeror web browser.
1670 *** Support for several ancient browsers is now officially obsolete.
1673 ** tar-mode: new 'tar-new-entry' command, allowing for new members to
1674 be added to the archive.
1679 *** Dired buffers are also auto-reverted via file notifications, if
1680 Emacs is compiled with file notification support.
1683 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
1684 See <http://debbugs.gnu.org/22814>.
1686 ** File Notifications
1689 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1692 *** The new event 'stopped' signals, that a file notification watch is
1693 not active any longer.
1696 *** The new function 'file-notify-valid-p' checks, whether a file
1697 notification descriptor still corresponds to an activate watch.
1702 *** The command 'dired-do-compress' bound to 'Z' now can compress
1703 directories and decompress zip files.
1706 *** New command 'dired-do-compress-to' bound to 'c' can be used to
1707 compress many marked files into a single named archive. The
1708 compression command is determined from the new
1709 'dired-compress-files-alist' variable.
1712 *** New user interface for the 'A' and 'Q' commands.
1713 These keys, now bound to 'dired-do-find-regexp' and
1714 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
1715 and 'xref-query-replace-in-results': they present the matches
1716 in the '*xref*' buffer and let you move through the matches. No need
1717 to use 'tags-loop-continue' to resume the search or replace loop. The
1718 previous commands, 'dired-do-search' and
1719 'dired-do-query-replace-regexp', are still available, but not bound to
1720 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
1721 back. We intend to obsolete the old commands in a future release.
1723 ** Tabulated List Mode
1726 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
1727 call 'tabulated-list-init-header', in which case it will have no
1731 *** 'tabulated-list-print' takes a second optional argument, update,
1732 which specifies an alternative printing method which is faster when
1733 few or no entries have changed.
1735 ** Obsolete packages
1741 *** landmark.el (moved to elpa.gnu.org)
1744 * New Modes and Packages in Emacs 25.1
1747 ** pinentry.el allows GnuPG passphrase to be prompted through the
1748 minibuffer instead of a graphical dialog, depending on whether the gpg
1749 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1750 is set). This feature requires newer versions of GnuPG (2.1.5 or
1751 later) and Pinentry (0.9.5 or later). To use this feature, add
1752 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1753 configuration with "gpgconf --reload gpg-agent".
1756 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1757 The main entry points are 'cl-defgeneric' and 'cl-defmethod'. See the
1758 node "Generic Functions" in the Emacs Lisp manual for more details.
1761 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1762 SCSS (Sassy CSS) files.
1765 ** let-alist is a new macro (and a package) that allows one to easily
1766 let-bind the values stored in an alist.
1769 ** 'tildify-mode' allows automatic insertion of hard spaces as one
1770 types the text. Breaking line after a single-character words is
1771 forbidden by Czech and Polish typography (and may be discouraged in
1772 other languages), so 'auto-tildify-mode' makes it easier to create
1773 a typographically-correct documents.
1776 ** The 'seq' library adds sequence manipulation functions and macros
1777 that complement basic functions provided by subr.el. All functions
1778 are prefixed with 'seq-' and work on lists, strings and vectors.
1779 'pcase' accepts a new Upattern 'seq'.
1782 ** The 'map' library provides map-manipulation functions that work on
1783 alists, hash-table and arrays. All functions are prefixed with
1784 'map-'. 'pcase' accepts a new UPattern 'map'.
1787 ** The 'thunk' library provides functions and macros to control the
1788 evaluation of forms.
1791 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1792 support for JSX, an XML-like syntax extension to ECMAScript.
1795 * Incompatible Lisp Changes in Emacs 25.1
1798 ** 'setq' and 'setf' must now be called with an even number of
1799 arguments. The earlier behavior of silently supplying a nil to the
1800 last variable when there was an odd number of arguments has been
1804 ** 'syntax-begin-function' is declared obsolete.
1805 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1806 slot in font-lock-defaults.
1809 ** The new implementation of Subword mode affects word movement everywhere.
1810 When Subword mode is turned on, 'forward-word', 'backward-word', and
1811 everything that uses them will move by sub-words, effectively
1812 overriding the buffer's syntax table. Lisp programs that shouldn't be
1813 affected by Subword mode should call the new functions
1814 'forward-word-strictly' and 'backward-word-strictly' instead.
1817 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
1818 called during startup. Users who call this function in their init
1819 file and still expect it to be run after startup should set
1820 'package-enable-at-startup' to t after the call to
1821 'package-initialize'.
1824 ** ':global' minor mode use 'setq-default' rather than 'setq'.
1825 This means that you can't use 'make-local-variable' and expect them to
1826 "magically" become buffer-local.
1829 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
1830 The 'track-mouse' form no longer refrains from changing the shape of
1831 the mouse pointer for the entire time the body of that form is
1832 executed. Lisp programs that use 'track-mouse' for dragging across
1833 large portions of the Emacs display, and want to avoid changes in the
1834 pointer shape during dragging, should bind the variable 'track-mouse'
1835 to the special value 'dragging' in the body of the form.
1838 ** The optional 'predicate' argument of 'lisp-complete-symbol' no longer
1839 has any effect. (This change was made in Emacs 24.4 but was not
1840 advertised at the time.)
1843 ** 'indirect-function' does not signal 'void-function' any more.
1844 This is mostly a bug-fix, since this change was missed back in 24.4 when
1845 symbol-function was changed not to signal 'void-function' any more.
1848 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
1851 ** M-x shell and M-x compile no longer set the EMACS environment variable.
1852 This avoids clashing when other programs use the variable for other purposes.
1853 Although M-x term still sets EMACS for compatibility with Bash 4.3 and earlier,
1854 this is deprecated and will be phased out when Bash 4.4 or later takes over.
1855 Use the INSIDE_EMACS environment variable instead.
1858 ** 'save-excursion' does not save&restore the mark any more.
1859 Use 'save-mark-and-excursion' if you want the old behavior.
1862 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
1863 argument ('predicate').
1866 ** 'completion-table-dynamic' by default stays in the minibuffer.
1867 The minibuffer will be the current buffer when the function is called.
1868 If you want the old behavior of calling the function in the buffer
1869 from which the minibuffer was entered, use the new argument
1870 'switch-buffer' to 'completion-table-dynamic'.
1873 ** window-configurations no longer record the buffers' marks.
1876 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1877 active region handling.
1880 ** deactivate-mark is now buffer-local.
1883 ** 'cl-the' now asserts that its argument is of the given type.
1886 ** 'process-running-child-p' may now return a numeric process
1887 group ID instead of 't'.
1890 ** Mouse click events on mode line or header line no longer include
1891 any reference to a buffer position. The 6th member of the mouse
1892 position list returned for such events is now nil.
1895 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1896 These slots used to hold key-shortcut data, but have been obsolete since
1900 ** Emacs no longer downcases the first letter of a system diagnostic
1901 when signaling a file error. For example, it now reports "Permission
1902 denied" instead of "permission denied". The old behavior was problematic
1903 in languages like German where downcasing rules depend on grammar.
1906 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
1907 Set it to 'curve' for curved single quotes, to 'straight' for straight
1908 apostrophes, and to 'grave' for grave accent and apostrophe. The
1909 default value nil acts like 'curve' if curved single quotes are
1910 displayable, and like 'grave' otherwise. The new variable affects
1911 display of diagnostics and help, but not of info.
1914 ** substitute-command-keys now replaces quotes.
1915 That is, it converts documentation strings' quoting style as per the
1916 value of 'text-quoting-style'. Doc strings in source code can use
1917 either curved single quotes or grave accents and apostrophes. As
1918 before, characters preceded by \= are output as-is.
1921 ** Message-issuing functions 'error', 'message', etc. now convert quotes.
1922 They use the new 'format-message' function instead of plain 'format',
1923 so that they now follow user preference as per 'text-quoting-style'
1924 when processing curved single quotes, grave accents, and apostrophes
1925 in their format argument.
1928 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1929 now match multibyte characters using Unicode character properties.
1930 If you want the old behavior where they matched any character with
1931 word syntax, use '\sw' instead.
1934 ** The character classes [:graph:] and [:print:] in regular expressions
1935 no longer match every multibyte character. Instead, Emacs now
1936 consults the Unicode character properties to determine which
1937 characters are graphic or printable. In particular, surrogates and
1938 unassigned codepoints are now rejected. If you want the old behavior,
1939 use [:multibyte:] instead.
1942 ** The 'diff' command uses the unified format now. To restore the old
1943 behavior, set 'diff-switches' to '-c'.
1946 ** 'grep-template' and 'grep-find-template' values don't include the
1947 --color argument anymore. It's added at the <C> place holder position
1948 dynamically. Any third-party code that changes these templates should
1949 be updated accordingly.
1952 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
1953 The new behavior is compatible with Common Lisp and with XEmacs.
1954 This change does not affect Lisp code intended to be portable to
1955 Emacs 24.2 and earlier, which did not support unary '/'.
1958 ** The 'default-directory' value doesn't have to end slash. To make
1959 that happen, 'unhandled-file-name-directory' now defaults to calling
1960 'file-name-as-directory'.
1963 * Lisp Changes in Emacs 25.1
1967 *** New UPatterns 'quote', 'app'.
1969 *** New UPatterns can be defined with 'pcase-defmacro'.
1971 *** New vector QPattern.
1974 ** syntax-propertize is now automatically called on-demand during forward
1975 parsing functions like 'forward-sexp'.
1978 ** New hooks 'prefix-command-echo-keystrokes-functions' and
1979 'prefix-command-preserve-state-hook' allow the definition of prefix
1980 commands other than the predefined 'C-u'.
1983 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
1984 These allow conversion between buffer positions and the corresponding
1985 file byte offsets, given the file's encoding.
1988 ** The default value of 'load-read-function' is now 'read'.
1989 Previously, the default value of 'nil' implied using 'read'.
1992 ** New hook 'pre-redisplay-functions'.
1993 It is a bit easier to use than 'pre-redisplay-function'.
1996 ** The second arg of 'looking-back' should always be provided explicitly.
1997 Previously, it was an optional argument, now it's mandatory.
2000 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
2001 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
2002 implemented by the new 'cursor-intangible-mode' and
2003 'cursor-sensor-mode' minor modes.
2006 ** 'inhibit-point-motion-hooks' now defaults to 't' and is obsolete.
2007 Use the new minor modes 'cursor-intangible-mode' and
2008 'cursor-sensor-mode' instead.
2011 ** New process type 'pipe', which can be used in combination with the
2012 ':stderr' keyword of make-process to handle standard error output
2016 ** New function 'make-process' provides an alternative interface to
2017 'start-process'. It allows programs to set process parameters such as
2018 process filter, sentinel, etc., through keyword arguments (similar to
2019 'make-network-process').
2022 ** A new function 'directory-files-recursively' returns all matching
2023 files (recursively) under a directory.
2026 ** New variable 'inhibit-message', when bound to non-nil, inhibits
2027 'message' and related functions from displaying messages in the echo
2028 area. The output is still logged to the *Messages* buffer.
2031 ** A new text property 'inhibit-read-only' can be used in read-only
2032 buffers to allow certain parts of the text to be writable.
2035 ** A new variable 'comment-end-can-be-escaped' is useful in languages
2036 such as C and C++ where line comments with escaped newlines are
2037 continued to the next line.
2040 ** New macro 'define-advice'.
2043 ** Emacs Lisp now supports generators.
2044 See the "Generators" section of the ELisp manual for the details.
2047 ** New finalizer facility for running code when objects become unreachable.
2048 See the "Finalizer Type" subsection in the ELisp manual for the
2052 ** lexical closures can use (:documentation FORM) to build their docstring.
2053 It should be placed right where the docstring would be, and FORM is then
2054 evaluated (and should return a string) when the closure is built.
2057 ** define-inline provides a new way to define inlinable functions.
2060 ** New function 'macroexpand-1' to perform a single step of macro expansion.
2063 ** Some "x-*" functions were obsoleted and/or renamed:
2064 *** x-select-text is renamed gui-select-text.
2065 *** x-selection-value is renamed gui-selection-value.
2066 *** x-get-selection is renamed gui-get-selection.
2067 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
2068 *** x-get-selection-value is renamed to gui-get-primary-selection.
2069 *** x-set-selection is renamed to gui-set-selection
2072 ** New function 'string-greaterp', which return the opposite result of
2076 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
2077 preserve the collation order as defined by the system's locale(1)
2078 environment. For the time being this is implemented for modern POSIX
2079 systems and for MS-Windows, for other systems they fall back to their
2080 counterparts 'string-lessp' and 'string-equal'.
2083 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
2084 The effect is that, on systems that use ls-lisp for Dired, the default
2085 sort order of the files in Dired is now different from what it was in
2086 previous versions of Emacs. In particular, the file names are sorted
2087 disregarding punctuation, accents, and diacritics, and letter case is
2088 ignored. For example, files whose name begin with a period will no
2089 longer appear near the beginning of the directory listing. If you
2090 want the old, locale-independent sorting, customize the new option
2091 'ls-lisp-use-string-collate' to the nil value.
2094 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
2095 if set to a non-nil value, causes the above 2 functions to ignore
2096 symbol and punctuation characters when collating strings. This
2097 emulates the behavior of modern Posix platforms when the locale's
2098 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
2099 MS-Windows doesn't support UTF-8 as codeset in its locales.
2102 ** New function 'alist-get', which is also a valid place (aka lvalue).
2105 ** New function 'funcall-interactively', which works like 'funcall'
2106 but makes 'called-interactively-p' treat the function as (you guessed it)
2107 called interactively.
2110 ** New function 'function-put' to use instead of 'put' for function properties.
2113 ** The new function 'bidi-find-overridden-directionality' allows you to
2114 find characters whose directionality was, perhaps maliciously,
2115 overridden by directional override control characters. Lisp programs
2116 can use this to detect potential phishing of URLs and other links that
2117 exploits bidirectional display reordering.
2120 ** The new function 'buffer-substring-with-bidi-context' allows you to
2121 copy a portion of a buffer into a different location while preserving
2122 the visual appearance both of the copied text and the text at
2123 destination, even when the copied text includes mixed bidirectional
2124 text and directional control characters.
2127 ** New properties that can be specified with 'declare':
2128 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
2129 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
2130 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
2134 ** New macro 'with-file-modes', for evaluating expressions with default file
2135 permissions set to temporary values (e.g., for creating private files).
2138 ** You can access the slots of structures using 'cl-struct-slot-value'.
2141 ** Function 'sort' can deal with vectors.
2144 ** Function 'system-name' now returns an updated value if the current
2145 system's name has changed or if the Emacs process has changed systems,
2146 and to avoid long waits it no longer consults DNS to canonicalize the
2147 name. The variable 'system-name' is now obsolete.
2150 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
2153 ** If 'pwd' is called with a prefix argument, insert the current default
2157 ** New functions return extended information about fonts and faces.
2160 *** The function 'font-info' now returns more details about a font.
2161 In particular, it now returns the average width of the font's
2162 characters, which can be used for geometry-related calculations.
2165 *** A new function 'default-font-width' returns the average width of a
2166 character in the current buffer's default font. If the default face
2167 is remapped (see 'face-remapping-alist'), the value for the remapped
2168 face is returned. This function complements the existing function
2169 'default-font-height'.
2172 *** New functions 'window-font-height' and 'window-font-width' return
2173 the height and average width of characters in a specified face and
2174 window. If FACE is remapped (see 'face-remapping-alist'), the
2175 function returns the information for the remapped face.
2178 *** A new function 'window-max-chars-per-line' returns the maximal
2179 number of characters that can be displayed on one line. If a face
2180 and/or window are provided, these values are used for the
2181 calculation. This function is different from 'window-body-width' in
2182 that it accounts for (i) continuation glyphs, (ii) the size of the
2183 font, and (iii) the specified window.
2186 ** New utilities in subr-x.el:
2187 *** New macros 'if-let' and 'when-let' allow defining bindings and to
2188 execute code depending whether all values are true.
2189 *** New macros 'thread-first' and 'thread-last' allow threading a form
2190 as the first or last argument of subsequent forms.
2193 ** Documentation strings now support quoting with curved single quotes
2194 in addition to the old style with grave accent and apostrophe. The
2195 new style looks better on today's displays. In the new Electric Quote
2196 mode, you can enter curved single quotes into documentation by typing
2197 grave accent and apostrophe. Outside Electric Quote mode, you can
2198 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
2199 works) by typing 'A-[' and 'A-]'. As described above under
2200 'text-quoting-style', the user can specify how to display doc string
2204 ** New function 'format-message' is like 'format' and also converts
2205 curved single quotes, grave accents and apostrophes as per
2206 'text-quoting-style'.
2209 ** show-help-function's arg is converted via substitute-command-keys
2210 before being passed to the function. Help strings, help-echo
2211 properties, etc. can therefore contain command key escapes and
2215 ** Time-related changes:
2217 *** Time conversion functions now accept an optional ZONE argument
2218 that specifies the time zone rules for conversion. ZONE is omitted or
2219 nil for Emacs local time, t for Universal Time, 'wall' for system wall
2220 clock time, or a string as in the TZ environment variable. The
2221 affected functions are 'current-time-string', 'current-time-zone',
2222 'decode-time', and 'format-time-string'. The function 'encode-time',
2223 which already accepted a simple time zone rule argument, has been
2224 extended to accept all the new forms.
2226 *** Incompatible change in the third argument of 'format-time-string'.
2227 Previously, any non-nil argument was interpreted as specifying Universal Time.
2228 This is no longer true; packages that want Universal Time should pass t
2229 as the third argument.
2231 *** Time-related functions now consistently accept numbers
2232 (representing seconds since the epoch) and nil (representing the
2233 current time) as well as the usual list-of-integer representation.
2234 Affected functions include 'current-time-string', 'current-time-zone',
2235 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
2236 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
2237 'time-to-days', and 'time-to-seconds'.
2239 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
2242 *** 'calendar-next-time-zone-transition', 'time-add', and
2243 'time-subtract' no longer return time values in the obsolete and
2244 undocumented integer-pair format. Instead, they return a list of two
2248 ** New function 'set-binary-mode' allows switching a standard stream
2249 of the Emacs process to binary I/O mode.
2252 ** The new function 'directory-name-p' can be used to check whether a file
2253 name (as returned from, for instance, 'file-name-all-completions') is
2254 a directory file name. It returns non-nil if the last character in
2255 the name is a directory separator character (forward slash on GNU and
2256 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2259 ** ASCII approximations to curved quotes are put in standard-display-table
2260 if the terminal cannot display curved quotes.
2263 ** Standard output and error streams now transliterate characters via
2264 standard-display-table, and encode output using locale-coding-system.
2265 To force a specific encoding, bind 'coding-system-for-write' to the
2266 coding-system of your choice when invoking functions like 'prin1' and
2270 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
2273 ** New possible value for 'system-type': 'nacl'.
2274 This is used by Google's Native Client (NaCl).
2276 ** Miscellaneous name change
2279 For consistency with the usual Emacs spelling, the Lisp variable
2280 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
2281 The old name should still work, as an obsolescent alias.
2283 ** Changes in Frame- and Window- Handling
2286 *** Emacs can now draw horizontal scroll bars on some platforms that
2287 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2288 Horizontal scroll bars are turned off by default.
2290 **** New function 'horizontal-scroll-bars-available-p' telling whether
2291 horizontal scroll bars are available on the underlying system.
2293 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
2294 bars on all existing and future frames.
2296 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
2297 scroll bars on the selected frame.
2299 **** New frame parameters 'horizontal-scroll-bars' and
2300 'scroll-bar-height' to set horizontal scroll bars and their height
2301 for individual frames and in 'default-frame-alist'.
2303 **** New functions 'frame-scroll-bar-height' and
2304 'window-scroll-bar-height' return the height of horizontal scroll
2305 bars on a specific frame or window.
2307 **** 'set-window-scroll-bars' now accepts five parameters where the last
2308 two specify height and type of the window's horizontal scroll bar.
2310 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
2313 **** New buffer-local variables 'horizontal-scroll-bar' and
2314 'scroll-bar-height'.
2317 *** New functions 'frame-geometry' and 'frame-edges' give access to a
2321 *** New functions 'mouse-absolute-pixel-position' and
2322 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
2326 *** The function 'window-edges' now accepts three additional arguments to
2327 retrieve body, absolute and pixel edges of the window.
2330 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
2331 'window-inside-absolute-pixel-edges' have been renamed to respectively
2332 'window-body-edges', 'window-body-pixel-edges' and
2333 'window-absolute-body-pixel-edges'. The old names are kept as aliases.
2336 *** New function 'window-absolute-pixel-position' to get the screen
2337 coordinates of a visible buffer position.
2340 *** The height of a frame's menu and tool bar are no longer counted in the
2341 frame's text height. This means that the text height stands only for
2342 the height of the frame's root window plus that of the echo area (if
2343 present). This was already the behavior for frames with external tool
2344 and menu bars (like in the Gtk builds) but has now been extended to all
2348 *** Frames now do not necessarily preserve the number of columns or lines
2349 they display when setting default font, menu bar, fringe width, or
2350 scroll bars. In particular, maximized and fullscreen frames are
2351 conceptually never resized if such settings change. For fullheight and
2352 fullwidth frames, the behavior may depend on the toolkit used.
2353 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
2354 setting default font, menu bar, fringe width, or scroll bars of a
2355 specific frame does not resize that frame in order to preserve the
2356 number of columns or lines it displays.
2359 *** New function 'window-preserve-size' allows you to preserve the size of
2360 a window without "fixing" it. It's supported by 'fit-window-to-buffer',
2361 'temp-buffer-resize-mode' and 'display-buffer'.
2364 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
2365 This displays the buffer in an existing frame other than the current
2366 frame, and allows the caller to specify a frame predicate to exclude
2370 *** New minor mode 'window-divider-mode' and options
2371 'window-divider-default-places', 'window-divider-default-bottom-width'
2372 and 'window-divider-default-right-width'.
2375 *** The window displaying the '*Completions*' buffer with minibuffer
2376 completion candidates is now shown at the bottom of the selected
2377 frame. The size of that window is always as large as required to
2378 display all the candidates, except when limited by the minimum size
2379 of the other windows on that frame; those other windows are resized
2380 to provide space for the '*Completions*' display. The Emacs manual
2381 describes how to customize 'display-buffer-alist' to get back the old
2382 behavior, see the node "Temporary Displays" there.
2385 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2386 Those features have been deprecated in Gtk+ for a long time.
2391 *** etags no longer qualifies class members by default.
2393 By default, 'etags' will not qualify class members for Perl and C-like
2394 object-oriented languages with their class names and namespaces, and
2395 will remove qualifications used explicitly in the code from the tag
2396 names it puts in TAGS files. This is so the etags.el back-end for
2397 'xref-find-definitions' is more accurate and produces less false
2400 Use --class-qualify (-Q) if you want the old default behavior of
2401 qualifying class members in C++, Java, Objective C, and Perl. Note
2402 that using -Q might make some class members become "unknown" to 'M-.'
2403 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
2404 qualified names by hand.
2407 *** New language Ruby
2409 Names of modules, classes, methods, functions, and constants are
2410 tagged. Overloaded operators are also tagged.
2414 Names of packages, functions, and types are tagged.
2417 *** Improved support for Lua
2419 Etags now tags functions even if the "function" keyword follows some
2420 whitespace at line beginning.
2423 * Changes in Emacs 25.1 on Non-Free Operating Systems
2426 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2427 This includes the makefile.w32-in files in various subdirectories, and
2428 the support files. The file nt/configure.bat now just tells the user
2429 to use the procedure described in nt/INSTALL, by running the Posix
2430 'configure' script in the top-level directory.
2433 ** Building Emacs for MS-Windows requires at least Windows XP
2434 or Windows Server 2003. The built binaries still run on all versions
2435 of Windows starting with Windows 9X.
2438 ** Emacs running on MS-Windows now supports the daemon mode.
2441 ** The byte counts in etags-generated TAGS files are now the same on
2442 MS-Windows as they are on other platforms.
2445 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2446 Pass '--without-ns' to configure to create an X11 build, the old default.
2449 ** OS X 10.5 or older is no longer supported.
2452 ** OS X on PowerPC is no longer supported.
2455 ** New variable 'ns-use-fullscreen-animation' controls animation for
2456 non-native NS fullscreen. The default is nil. Set to t to enable
2457 animation when entering and leaving fullscreen. For native OSX fullscreen
2461 ** The new function 'w32-application-type' returns the type of an
2462 MS-Windows application given the name of its executable program file.
2464 ** New variable 'w32-pipe-buffer-size'.
2465 It can be used to tune the size of the buffer of pipes created for
2466 communicating with subprocesses, when the program run by a subprocess
2467 exhibits unusual buffering behavior. Default is zero, which lets the
2468 OS use its default size.
2471 ----------------------------------------------------------------------
2472 This file is part of GNU Emacs.
2474 GNU Emacs is free software: you can redistribute it and/or modify
2475 it under the terms of the GNU General Public License as published by
2476 the Free Software Foundation, either version 3 of the License, or
2477 (at your option) any later version.
2479 GNU Emacs is distributed in the hope that it will be useful,
2480 but WITHOUT ANY WARRANTY; without even the implied warranty of
2481 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2482 GNU General Public License for more details.
2484 You should have received a copy of the GNU General Public License
2485 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2491 paragraph-separate: "[
\f]*$"