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
59 ** `find-library', `help-function-def' and `help-variable-def' now run
60 `find-function-after-hook'.
63 ** 'process-attributes' on Darwin systems now returns more information.
66 ** Several accessors for the value returned by 'file-attributes'
67 have been added. They are: 'file-attribute-type',
68 'file-attribute-link-number', 'file-attribute-user-id',
69 'file-attribute-group-id', 'file-attribute-access-time',
70 'file-attribute-modification-time',
71 'file-attribute-status-change-time', 'file-attribute-size',
72 'file-attribute-modes', 'file-attribute-inode-number', and
73 'file-attribute-device-number'.
76 ** The new function 'buffer-hash' computes compute a fast, non-consing
77 hash of a buffer's contents.
80 ** 'fill-paragraph' no longer marks the buffer as changed unless it
81 actually changed something.
84 ** The locale language name 'ca' is now mapped to the language
85 environment 'Catalan', which has been added.
88 ** 'align-regexp' has a separate history for its interactive argument.
89 'align-regexp' no longer shares its history with all other
90 history-less functions that use 'read-string'.
93 ** The networking code has been reworked so that it's more
94 asynchronous than it was (when specifying :nowait t in
95 'make-network-process'). How asynchronous it is varies based on the
96 capabilities of the system, but on a typical GNU/Linux system the DNS
97 resolution, the connection, and (for TLS streams) the TLS negotiation
98 are all done without blocking the main Emacs thread. To get
99 asynchronous TLS, the TLS boot parameters have to be passed in (see
100 the manual for details).
102 Certain process oriented functions (like 'process-datagram-address')
103 will block until socket setup has been performed. The recommended way
104 to deal with asynchronous sockets is to avoid interacting with them
105 until they have changed status to "run". This is most easily done
106 from a process sentinel.
108 ** 'make-network-process' and 'open-network-stream' sometimes allowed
109 :service to be an integer string (e.g., :service "993") and sometimes
110 required an integer (e.g., :service 993). This difference has been
111 eliminated, and integer strings work everywhere.
113 ** It is possible to disable attempted recovery on fatal signals.
115 Two new variables support disabling attempts to recover from stack
116 overflow and to avoid automatic auto-save when Emacs is delivered a
117 fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
118 will disable attempts to recover from C stack overflows; Emacs will
119 then crash as with any other fatal signal.
120 'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
121 disable attempts to auto-save the session and shut down in an orderly
122 fashion when Emacs receives a fatal signal; instead, Emacs will
123 terminate immediately. Both variables are non-'nil' by default.
124 These variables are for users who would like to avoid the small
125 probability of data corruption due to techniques Emacs uses to recover
129 ** A second dir-local file (.dir-locals-2.el) is now accepted.
130 See the variable 'dir-locals-file-2' for more information.
133 ** International domain names (IDNA) are now encoded via the new
134 puny.el library, so that one can visit web sites with non-ASCII URLs.
137 ** The new 'timer-list' command lists all active timers in a buffer,
138 where you can cancel them with the 'c' command.
141 ** The new function 'read-multiple-choice' prompts for multiple-choice
142 questions, with a handy way to display help texts.
145 * Editing Changes in Emacs 25.2
148 ** New bindings for 'query-replace-map'.
149 'undo', undo the last replacement; bound to 'u'.
150 'undo-all', undo all replacements; bound to 'U'.
153 * Changes in Specialized Modes and Packages in Emacs 25.2
158 *** Messages from CMake are now recognized.
163 *** In wdired, when editing files to contain slash characters,
164 the resulting directories are automatically created. Whether to do
165 this is controlled by the 'wdired-create-parent-directories' variable.
168 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
169 viewing HTML files and the like.
174 *** A new 's' command for switching to another eww buffer via the minibuffer.
177 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
178 with the 'o' command from 'image-map'.
181 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
182 whether to use the HTML-specified colors or not. The user can also
183 customize the 'shr-use-colors' variable.
186 *** Images that are being loaded are now marked with gray
187 "placeholder" images of the size specified by the HTML. They are then
188 replaced by the real images asynchronously, which will also now
189 respect width/height HTML specs (unless they specify widths/heights
190 bigger than the current window).
195 *** Images are automatically scaled before displaying based on the
196 'image-scaling-factor' variable (if Emacs supports scaling the images
200 *** Images inserted with 'insert-image' and related functions get a
201 keymap put into the text properties (or overlays) that span the
202 image. This keymap binds keystrokes for manipulating size and
203 rotation, as well as saving the image to a file. These commands are
204 also available in 'image-mode'.
207 *** A new library for creating and manipulating SVG images has been
208 added. See the "SVG Images" section in the lispref manual for
212 *** New setf-able function to access and set image parameters is
213 provided: 'image-property'.
216 ** The commands that add ChangeLog entries now prefer a VCS root directory
217 for the ChangeLog file, if none already exists. Customize
218 'change-log-directory-files' to nil for the old behavior.
221 ** Support for non-string values of 'time-stamp-format' has been removed.
226 *** 'message-use-idna' now defaults to t (because Emacs comes with
227 built-in IDNA support now).
230 *** The 'message-valid-fqdn-regexp' variable has been removed, since
231 there are now top-level domains added all the time. Message will no
232 longer warn about sending emails to top-level domains it hasn't heard
235 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
236 In 'visual-line-mode' it will look for the true beginning of a header
237 while in non-'visual-line-mode' it will move the point to the indented
243 *** New connection method "sg", which supports editing files under a
247 *** New connection method "doas" for OpenBSD hosts.
250 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
255 *** Support for completing attribute values and bang-rules using the
256 'completion-at-point' command.
259 ** Emacs now supports character name escape sequences in character and
260 string literals. The syntax variants \N{character name} and
261 \N{U+code} are supported.
264 ** Prog mode has some support for multi-mode indentation.
265 This allows better indentation support in modes that support multiple
266 programming languages in the same buffer, like literate programming
267 environments or ANTLR programs with embedded Python code.
269 A major mode can provide indentation context for a sub-mode through
270 the 'prog-indentation-context' variable. To support this, modes that
271 provide indentation should use 'prog-widen' instead of 'widen' and
272 'prog-first-column' instead of a literal zero. See the node
273 "Mode-Specific Indent" in the ELisp manual for more details.
277 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
283 *** The new function 'url-cookie-delete-cookie' can be used to
284 programmatically delete all cookies, or cookies from a specific
288 *** `url-retrieve-synchronously' now takes an optional timeout parameter.
291 *** The URL package now support HTTPS over proxies supporting CONNECT.
294 *** 'url-user-agent' now defaults to 'default', and the User-Agent
295 string is computed dynamically based on 'url-privacy-level'.
297 ** VC and related modes
300 *** The VC state indicator in the mode line now defaults to more
301 colorful faces to make it more obvious to the user what the state is.
302 See the 'vc-faces' customization group.
305 * New Modes and Packages in Emacs 25.2
308 * Incompatible Lisp Changes in Emacs 25.2
311 ** Resizing a frame no longer runs 'window-configuration-change-hook'.
312 Put your function on 'window-size-change-functions' instead.
314 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
315 mode to send the same escape sequences that xterm does. This makes
316 things like forward-word in readline work.
319 ** hideshow mode got four key bindings that are analogous to outline
320 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
322 ** The grep/rgrep/lgrep functions will now ask about saving files
323 before running. This is controlled by the 'grep-save-buffers'
327 * Lisp Changes in Emacs 25.2
329 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss.
331 ** Autoload files can be generated without timestamps,
332 by setting 'autoload-timestamps' to nil.
333 FIXME As an experiment, nil is the current default.
334 If no insurmountable problems before next release, it can stay that way.
336 ** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
340 ** 'gnutls-boot' now takes a parameter :complete-negotiation that says
341 that negotiation should complete even on non-blocking sockets.
344 ** New functions 'window-pixel-width-before-size-change' and
345 'window-pixel-height-before-size-change' support detecting which
346 window changed size when 'window-size-change-functions' are run.
349 ** New function 'display-buffer-reuse-mode-window' is an action function
350 suitable for use in 'display-buffer-alist'. For example, to avoid creating
351 a new window when opening man pages when there's already one, use
352 (add-to-list 'display-buffer-alist
353 '("\\`\\*Man .*\\*\\'" .
354 (display-buffer-reuse-mode-window
355 (inhibit-same-window . nil)
359 ** There is now a new variable 'flyspell-sort-corrections-function'
360 that allows changing the way corrections are sorted.
363 ** The new command 'fortune-message' has been added, which displays
364 fortunes in the echo area.
367 ** New function 'func-arity' returns information about the argument list
368 of an arbitrary function. This generalizes 'subr-arity' for functions
369 that are not built-in primitives. We recommend using this new
370 function instead of 'subr-arity'.
373 ** 'parse-partial-sexp' state has a new element. Element 10 is
374 non-nil when the last character scanned might be the first character
375 of a two character construct, i.e., a comment delimiter or escaped
376 character. Its value is the syntax of that last character.
379 ** 'parse-partial-sexp''s state, element 9, has now been confirmed as
380 permanent and documented, and may be used by Lisp programs. Its value
381 is a list of currently open parenthesis positions, starting with the
382 outermost parenthesis.
385 ** 'read-color' will now display the color names using the color itself
386 as the background color.
388 ** The function 'redirect-debugging-output' now works on platforms
389 other than GNU/Linux.
392 ** The new function 'string-version-lessp' compares strings by
393 interpreting consecutive runs of numerical characters as numbers, and
394 compares their numerical values. According to this predicate,
395 "foo2.png" is smaller than "foo12.png".
398 ** The new function 'char-from-name' converts a Unicode name string
399 to the corresponding character code.
402 ** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
403 Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
404 two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
405 ('sxhash-eql') on them will be the same.
408 ** Function 'sxhash' has been renamed to 'sxhash-equal' for
409 consistency with the new functions. For compatibility, 'sxhash'
410 remains as an alias to 'sxhash-equal'.
413 ** Time conversion functions that accept a time zone rule argument now
414 allow it to be OFFSET or a list (OFFSET ABBR), where the integer
415 OFFSET is a count of seconds east of Universal Time, and the string
416 ABBR is a time zone abbreviation. The affected functions are
417 'current-time-string', 'current-time-zone', 'decode-time',
418 'format-time-string', and 'set-time-zone-rule'.
421 * Changes in Emacs 25.2 on Non-Free Operating Systems
423 ** Intercepting hotkeys on Windows 7 and later now works better.
424 The new keyboard hooking code properly grabs system hotkeys such as
425 Win-* and Alt-TAB, in a way that Emacs can get at them before the
426 system. This makes the 'w32-register-hot-key' functionality work
427 again on all versions of MS-Windows starting with Windows 7. On
428 Windows NT and later you can now register any hotkey combination. (On
429 Windows 9X, the previous limitations, spelled out in the Emacs manual,
432 ** `convert-standard-filename' no longer mirrors slashes on MS-Windows.
433 Previously, on MS-Windows this function converted slash characters in
434 file names into backslashes. It no longer does that.
437 * Installation Changes in Emacs 25.1
440 ** Building Emacs now requires C99 or later.
443 ** Building Emacs now requires GNU make, version 3.81 or later.
446 ** New configure option --with-cairo.
447 This builds Emacs with Cairo drawing. As a side effect, it provides
448 support for built-in printing, when Emacs was built with GTK+.
449 Cairo drawing is an experimental feature in Emacs, and subject to
450 change in future releases.
453 ** New configure option --with-modules.
454 This enables support for loading dynamic modules; see below.
457 ** By default, Emacs no longer works on IRIX. We expect that Emacs
458 users are not affected by this, as SGI stopped supporting IRIX in
459 December 2013. If you are affected, please send a bug report. You
460 should be able to work around the problem either by porting the Emacs
461 undumping code to GCC under IRIX, or by configuring --with-wide-int,
462 or by sticking with Emacs 24.4.
465 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
466 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
467 since Emacs 24.4, and the other variants were undocumented and were
468 obstacles to maintenance and development. GC_MARK_STACK and its
469 related symbols have been removed from the C internals.
472 ** 'configure' now prefers gnustep-config when configuring GNUstep.
473 If gnustep-config is not available, the old heuristics are used.
476 ** 'configure' now prefers inotify to gfile for file notification,
477 unless gfile is explicitly requested via --with-file-notification='gfile'.
480 ** 'configure' detects the kqueue file notification library on *BSD
481 and Mac OS X machines.
484 ** The configure option '--with-pkg-config-prog' has been removed.
485 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
488 ** The configure option '--with-mmdf' has been removed.
489 It was no longer useful, as it relied on libraries that are no longer
490 supported, and its presence led to confusion during configuration.
491 This affects only the 'movemail' utility; Emacs itself can still
492 process MMDF-format files as before.
495 ** The configure option '--enable-silent-rules' is now the default,
496 and silent rules are now quieter. To get the old behavior where
497 'make' chatters a lot, configure with '--disable-silent-rules' or
498 build with 'make V=1'.
501 ** The configure option '--with-gameuser' now allows you to specify a
502 group instead of a user if its argument is prefixed by ':' (a colon).
503 This will cause the game score files in ${localstatedir}/games/emacs
504 to be owned by that group, and the helper program for updating them to
505 be installed setgid. The option now defaults to the 'games' group.
508 ** The 'grep-changelog' script (and its manual page) are no longer included.
509 It has no particular connection to Emacs and has not changed in years,
510 so if you want to use it, you can always take a copy from an older Emacs.
513 ** Emacs 25 comes with a new set of icons.
514 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
515 The old Emacs logo icons are available as 'emacs23.png' in the same location.
518 ** New make target 'check-expensive' to run additional tests.
519 This includes all tests which run via "make check", plus additional
520 tests which take more time to perform.
523 * Startup Changes in Emacs 25.1
526 ** When Emacs is given a file as a command line argument and
527 'initial-buffer-choice' is non-nil, display both the file and
528 'initial-buffer-choice'. When Emacs is given more than one file and
529 'initial-buffer-choice' is non-nil, show 'initial-buffer-choice'
530 and *Buffer List*. This makes Emacs convenient to use from the
531 command line when 'initial-buffer-choice' is non-nil.
534 ** The value of 'initial-scratch-message' is now treated as a doc string
535 and can contain escape sequences for command keys, quotes, and the like.
538 ** The default height of GUI frames was enlarged.
539 This is so there's enough space in the initial window to display the
540 optional text about recovering crashes sessions, without losing the
541 splash image display.
544 * Changes in Emacs 25.1
547 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
548 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
549 xwidget support, you can access the embedded webkit browser with 'M-x
550 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
551 browser. The buffer will have a new mode, 'xwidget-webkit-mode'
552 (similar to 'image-mode'), which supports the webkit widget.
555 *** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
556 'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
557 'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
558 'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
559 'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
560 'xwidget-webkit-scroll-up'.
563 ** Emacs can now load shared/dynamic libraries (modules).
564 A dynamic Emacs module is a shared library that provides additional
565 functionality for use in Emacs Lisp programs, just like a package
566 written in Emacs Lisp would. The functions 'load', 'require',
567 'load-file', etc. were extended to load such modules, as they do with
568 Emacs Lisp packages. The new variable 'module-file-suffix' holds the
569 system-dependent value of the file-name extension ('.so' on Posix
570 hosts) of the module files.
572 A module should export a C-callable function named
573 'emacs_module_init', which Emacs will call as part of the call to
574 'load' or 'require' which loads the module. It should also export a
575 symbol named 'plugin_is_GPL_compatible' to indicate that its code is
576 released under the GPL or compatible license; Emacs will refuse to
577 load modules that don't export such a symbol.
579 If a module needs to call Emacs functions, it should do so through the
580 API defined and documented in the header file 'emacs-module.h'. Note
581 that any module that provides Lisp-callable functions will have to use
582 Emacs functions such as 'fset' and 'funcall', in order to register its
583 functions with the Emacs Lisp interpreter.
585 Modules can create 'user-ptr' Lisp objects that embed pointers to C
586 structs defined by the module. This is useful for keeping around
587 complex data structures created by a module, to be passed back to the
588 module's functions. User-ptr objects can also have associated
589 "finalizers" -- functions to be run when the object is GC'ed; this is
590 useful for freeing any resources allocated for the underlying data
591 structure, such as memory, open file descriptors, etc. A new
592 predicate 'user-ptrp' returns non-nil if its argument is a 'user-ptr'
595 Loadable modules in Emacs are an experimental feature, and subject to
596 change in future releases. For that reason, their support is disabled
597 by default, and must be enabled by using the '--with-modules' option
601 ** Network security (TLS/SSL certificate validity and the like) is
602 added via the new Network Security Manager (NSM) and controlled via
603 the 'network-security-level' variable.
606 ** C-h l now also lists the commands that were run.
609 ** x-select-enable-clipboard is renamed select-enable-clipboard
610 and x-select-enable-primary is renamed select-enable-primary.
611 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
612 name it), with the proviso that on some systems (e.g. Windows)
613 select-enable-primary is ineffective since the system doesn't
614 have the equivalent of a primary selection.
617 ** New option 'switch-to-buffer-in-dedicated-window' allows you to
618 customize how 'switch-to-buffer' proceeds interactively when the
619 selected window is strongly dedicated to its buffer.
622 ** The option 'even-window-heights' has been renamed to
623 'even-window-sizes' and now handles window widths as well.
626 ** terpri gets an optional arg ENSURE to conditionally output a newline.
629 ** 'insert-register' now leaves point after the inserted text
630 when called interactively. A prefix argument toggles this behavior.
633 ** The new variable 'term-file-aliases' replaces some files from lisp/term.
634 The function 'tty-run-terminal-initialization' consults this variable
635 when deciding what terminal-specific initialization code to run.
638 ** New variable 'system-configuration-features', listing some of the
639 main features that Emacs was compiled with. This is mainly intended
640 for use in Emacs bug reports.
643 ** A password is now hidden also when typed in batch mode. Another
644 hiding character but the default '.' can be used by let-binding the
645 variable 'read-hide-char'.
648 ** The Emacs pseudo-random number generator can be securely seeded.
649 On system where Emacs can access the system entropy or some other
650 cryptographically secure random stream, it now uses that when 'random'
651 is called with its argument 't'. This allows cryptographically strong
652 random values; in particular, the Emacs server now uses this facility
653 to produce its authentication key.
656 ** New input methods: 'tamil-dvorak' and 'programmer-dvorak'.
659 * Editing Changes in Emacs 25.1
662 ** M-x suggests shorthands and ignores obsolete commands for completion.
667 *** Successive single-char deletions are collapsed in the undo-log just like
668 successive char insertions. Which commands invoke this behavior is
669 controlled by the new 'undo-auto-amalgamate' function. See the node
670 "Undo" in the ELisp manual for more details.
673 *** The heuristic used to insert 'undo-boundary' after each command
674 has changed, so that if a command causes changes in more than just the
675 current buffer, Emacs now calls 'undo-boundary' in every buffer
676 affected by the command.
679 ** New command 'comment-line' bound to 'C-x C-;'.
681 ** New and improved facilities for inserting Unicode characters
684 *** Unicode names entered via C-x 8 RET now use substring completion by default.
687 *** C-x 8 now has shorthands for several chars, such as U+2010
688 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH). As
689 before, you can type C-x 8 C-h to list shorthands.
692 *** New minor mode electric-quote-mode for using curved quotes as you
693 type. See also the new variable 'text-quoting-style'.
696 ** New minor mode global-eldoc-mode is enabled by default.
699 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
700 Bracketed paste mode causes text terminals to wrap pasted text in special
701 escape sequences that allow Emacs to tell the difference between text
702 you type and text you paste from other applications. Emacs then
703 avoids interpreting each character in the pasted text as it does with
704 keyboard input, which results in a paste experience similar to that
705 under a window system, and significant performance improvements when
706 pasting large amounts of text.
708 Bracketed paste mode is disabled by default, so Emacs automatically
709 enables it at startup if the terminal supports it.
712 ** Emacs now supports the latest version of the UBA.
713 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
714 was updated to support all the latest additions and changes introduced
715 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
716 This includes full support for directional isolates and the
717 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
721 ** You can access 'mouse-buffer-menu' (C-down-mouse-1) using C-f10.
724 ** New buffer-local 'electric-pair-local-mode'.
727 ** New variable 'fast-but-imprecise-scrolling' inhibits
728 fontification during full screen scrolling operations, giving less
729 hesitant operation during auto-repeat of C-v, M-v at the cost of
730 possible inaccuracies in the end position.
733 ** New documentation command 'describe-symbol'.
734 Works for functions, variables, faces, etc. It is bound to 'C-h o' by
738 ** New function 'custom-prompt-customize-unsaved-options' checks for
739 unsaved customizations and prompts user to customize (if found). It
740 is intended for adding to 'kill-emacs-query-functions'.
743 ** The old 'C-x w' bindings in hi-lock-mode are officially deprecated
744 in favor of the global 'M-s h' bindings introduced in Emacs-23.1.
745 They'll disappear soon.
748 * Changes in Specialized Modes and Packages in Emacs 25.1
753 *** New command 'checkdoc-package-keywords' checks if the
754 current package keywords are recognized. Set the new option
755 'checkdoc-package-keywords-flag' to non-nil to make
756 'checkdoc-current-buffer' call this function automatically.
759 *** New function 'checkdoc-file' checks for style errors.
760 It's meant for use together with 'compile':
761 emacs -batch --eval "(checkdoc-file \"subr.el\")"
766 *** The desktop format version has been upgraded from 206 to 208.
767 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
768 cannot read a version 208 desktop. To upgrade your desktop file, you
769 must explicitly request the upgrade, by C-u M-x desktop-save. You are
770 recommended to do this as soon as you have firmly upgraded to Emacs
771 25.1 (or later). Should you ever need to downgrade your desktop file
772 to version 206, you can do this with C-u C-u M-x desktop-save.
775 ** New function 'bookmark-set-no-overwrite' bound to C-x r M.
776 It raises an error if a bookmark of that name already exists,
777 unlike 'bookmark-set' which silently updates an existing bookmark.
782 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
783 now control how mm-* functions fetch and display images in an HTML
784 message. Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
785 for that purpose, i.e., binds mm-html- variables with those gnus-
786 variables, but other packages do not have to bind gnus- variables now.
789 *** 'mm-inline-text-html-with-images' has been removed.
790 Use 'mm-html-inhibit-images' instead. Note that the value is opposite
796 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
797 GnuTLS encryption functions if possible.
802 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
803 the ordering of object keys by default.
806 *** New commands 'json-pretty-print-ordered' and
807 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
808 object keys sorted alphabetically.
810 ** Prettify Symbols mode
813 *** Prettify Symbols mode supports custom composition predicates. By
814 overriding the default 'prettify-symbols-compose-predicate', modes can
815 specify in which contexts a symbol may be displayed as some Unicode
816 character. 'prettify-symbols-default-compose-p' is the default which
817 is suitable for most programming languages such as C or Lisp (but not
821 *** Symbols can be unprettified while point is inside them.
822 New variable 'prettify-symbols-unprettify-at-point' configures this.
824 ** Enhanced xterm support
827 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
828 This variable tells Emacs which advanced capabilities are available in
829 the xterm terminal emulator used to display Emacs text-mode frames.
830 The default is to check each capability, and use it if available.
831 (This variable was introduced in Emacs 24.1, but was not announced in
835 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
836 in the surrounding GUI (using the OSC-52 escape sequence). This only works
837 if your xterm supports it and enables the 'allowWindowOps' options (disabled
838 by default at least in Debian, for security reasons).
840 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
841 escape sequence) if your xterm has the feature enabled but for that you
842 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
845 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
848 ** The way to turn on and off 'save-place' mode has changed.
849 It is no longer sufficient to load the saveplace library and set
850 'save-place' non-nil. Instead, use the two new minor modes:
851 'save-place-mode' turns on saving last place in every file, and
852 'save-place-local-mode' does that only for the file in whose buffer it
853 is invoked. The 'save-place' variable is now an obsolete alias for
854 'save-place-mode', which replaces it, and 'toggle-save-place' is an
855 obsolete alias for the new 'save-place-local-mode' command.
860 *** ERC can now hide message types by network or channel.
861 'erc-hide-list' will hide all messages of the specified type, while
862 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
863 specified message types for the respective specified targets.
866 *** Reconnection is now asynchronous.
869 *** Nick completion is now case-insensitive again after inadvertently
870 being made case-sensitive in Emacs 24.2.
875 *** New commands, key binds, and menu items.
877 **** '<' and '>' for navigating previous and next tracks in playlist
879 **** New play/pause command 'mpc-toggle-play' bound to 's'
881 **** 'g' bound to new command 'mpc-seek-current' will navigate current
884 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
885 toggling playback modes.
888 *** Now supports connecting to a UNIX domain socket.
891 *** Looks at more image file names to use as album art.
892 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
893 (XP) in addition to cover.jpg.
896 *** Searches in more locations for MPD configuration files.
897 MPD supports the XDG base directory specification since version 0.17.6.
902 *** 'midnight-mode' is now a proper minor mode.
905 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
910 *** New "external" package status.
911 An external package is any installed package that's not built-in and
912 not from 'package-user-dir', which usually means it's from an entry in
913 'package-directory-list'. They are treated much like built-in
914 packages, in that they cannot be deleted through the package menu and
915 are not considered for upgrades.
917 The effect is that a user can manually place a specific version of a
918 package inside 'package-directory-list' and the package menu will
922 *** If a package is available on multiple archives and one has higher
923 priority (as per 'package-archive-priorities') only that one is
924 listed. This can be configured with 'package-menu-hide-low-priority'.
927 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
928 This includes the above-mentioned low-priority packages, as well as
929 available packages whose version is lower than the currently installed
930 version (which were previously impossible to display).
931 This allows users to downgrade a package if a lower version is
935 *** When filtering the package menu, keywords starting with "arc:" or
936 "status:" represent package archive or status, respectively, instead
940 *** Most functions which involve downloading information now take an
941 ASYNC argument. If it is non-nil, package.el performs the download(s)
945 *** New variable 'package-menu-async' controls whether the
946 package-menu uses asynchronous downloads.
949 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
950 This follows the same rules as installing from a .tar file, except the
951 -pkg file is optional.
954 *** Packages which are dependencies of other packages cannot be deleted.
955 The FORCE argument to 'package-delete' overrides this.
958 *** New custom variable 'package-selected-packages' tracks packages
959 which were installed by the user (as opposed to installed as
960 dependencies). This variable can also be manually customized.
963 *** New command 'package-install-selected-packages' installs all
964 packages from 'package-selected-packages' which are currently missing.
967 *** 'package-install' function now takes a DONT-SELECT argument. If
968 this function is called interactively or if DONT-SELECT is nil, add the
969 package being installed to 'package-selected-packages'.
972 *** New command 'package-autoremove' removes all packages which were
973 installed strictly as dependencies but are no longer needed.
978 When you invoke 'shell' interactively, the *shell* buffer will now
979 display in a new window. However, you can customize this behavior via
980 the 'display-buffer-alist' variable. For example, to get
981 the old behavior -- *shell* buffer displays in current window -- use
982 (add-to-list 'display-buffer-alist
983 '("^\\*shell\\*$" . (display-buffer-same-window))).
987 *** The ':protection' slot option is not obeyed any more.
989 *** The 'newname' argument to constructors is optional&deprecated.
990 If you need your objects to be named, do it by inheriting from 'eieio-named'.
992 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
994 *** The <class> variables are declared obsolete.
996 *** The <initarg> variables are declared obsolete.
998 *** defgeneric and defmethod are declared obsolete.
999 Use the equivalent facilities from cl-generic.el instead.
1001 *** 'constructor' is now an obsolete alias for 'make-instance'.
1002 --- 'pcase' accepts a new UPattern 'eieio'.
1007 *** New command 'ido-bury-buffer-at-head' bound to C-S-b
1008 Bury the buffer at the head of 'ido-matches', analogous to how C-k
1009 kills the buffer at head.
1012 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
1013 meaning, and the list is restricted to those elements that do not
1014 match the current input.
1019 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
1020 The new commands 'next-line-or-history-element' and
1021 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
1022 minibuffer, allow by-line movement through minibuffer history,
1023 similarly to an ordinary buffer. Only when point moves over
1024 the bottom/top of the minibuffer it goes to the next/previous history
1025 element. 'M-p' and 'M-n' still move directly to previous/next history
1028 ** Search and Replace
1031 *** 'isearch' and 'query-replace' can now perform character folding in matches.
1032 This is analogous to case folding, but instead of disregarding case
1033 variants, it disregards wider classes of distinctions between similar
1034 characters. (Case folding is a special case of character folding.)
1035 This means many characters in the search string will match entire
1036 groups of characters instead of just themselves.
1038 For instance, the ASCII double quote character " will match all
1039 variants of double quotes, and the letter 'a' will match all of its
1040 accented cousins, even those composed of multiple characters, as well
1041 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
1044 Character folding is enabled by customizing 'search-default-mode' to
1045 the value 'character-fold-to-regexp'. You can also toggle character
1046 folding in the middle of a search by typing 'M-s ''.
1048 'query-replace' honors character folding if the new variable
1049 'replace-character-fold' is customized to a non-nil value.
1052 *** New user option 'search-default-mode'.
1053 This option specifies the default mode for Isearch. The default
1054 value, nil specifies that Isearch does literal searches (however,
1055 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
1056 as in previous Emacs versions).
1059 *** New function 'character-fold-to-regexp' can be used
1060 by searching commands to produce a regexp matching anything that
1061 character-folds into STRING.
1064 *** The new M-s M-w key binding uses eww to search the web for the
1065 text in the region. The search engine to use for this is specified by
1066 the customizable variable 'eww-search-prefix'.
1069 *** Query-replace history is enhanced.
1070 When query-replace reads the FROM string from the minibuffer, typing
1071 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
1072 and TO are the original text and its replacement, and SEP is an arrow
1073 string defined by the new variable 'query-replace-from-to-separator'.
1074 To select a prior replacement, type 'M-p' until the desired
1075 replacement appears in the minibuffer, and then exit the minibuffer by
1080 *** If 'quick-calc' is called with a prefix argument, insert the
1081 result of the calculation into the current buffer.
1084 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
1085 this you can tell Edebug not to stop at the start of the first
1086 instrumented function.
1091 *** New minor mode 'global-eldoc-mode'
1092 It is turned on by default, and affects '*scratch*' and other buffers
1093 whose major mode supports Emacs Lisp.
1096 *** 'eldoc-documentation-function' now defaults to 'ignore'
1099 *** 'describe-char-eldoc' displays information about character at point,
1100 and can be used as a default value of 'eldoc-documentation-function'. It is
1101 useful when, for example, one needs to distinguish various spaces - e.g.,
1102 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
1103 using mono-spaced font.
1108 *** HTML can now be rendered using variable-width fonts.
1111 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
1112 whether to use variable-pitch fonts or not. The user can also
1113 customize the 'shr-use-fonts' variable.
1116 *** A new command 'R' ('eww-readable') will try do identify the main
1117 textual parts of a web page and display only that, leaving menus and
1118 the like off the page.
1121 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
1122 toggle the paragraph direction between left-to-right and right-to-left.
1125 *** You can now use several eww buffers in parallel by renaming eww
1126 buffers you want to keep separate.
1129 *** Partial state of the eww buffers (the URIs and the titles of the
1130 pages visited) is now preserved in the desktop file.
1133 *** 'eww-after-render-hook' is now called after eww has rendered
1134 the data in the buffer.
1137 *** The 'eww-reload' command now takes a prefix to not reload via
1138 the net, but just use the local copy of the HTML.
1141 *** The DOM shr and eww uses has been changed to the general Emacs
1142 xml.el/libxml2 DOM, and a new package dom.el has been added to
1143 interact with this DOM. See the Emacs Lisp manual for interface
1147 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
1150 *** The new 'S' command will list all eww buffers, and allow managing
1154 *** https pages with valid certificates have headers marked in green, while
1155 invalid certificates are marked in red.
1160 *** text/html messages that contain inline image parts will be
1161 transformed into multipart/related messages before sending.
1164 ** In Show Paren Mode, a parenthesis can be highlighted when point
1165 stands inside it, and certain parens can be highlighted when point is
1166 at BOL or EOL, or in whitespace there. To enable these, customize,
1167 respectively, 'show-paren-when-point-inside-paren' or
1168 'show-paren-when-point-in-periphery'.
1171 ** If gpg2 exists on the system, it is now used as the default value
1172 of 'epg-gpg-program' (instead of gpg).
1177 *** Strings after ':documentation' are highlighted as docstrings.
1178 This enhances Lisp mode fontification to handle documentation of the
1179 form '(:documentation "the doc string")' used in Common Lisp code for
1180 CLOS class and slot documentation.
1182 ** Rectangle editing
1185 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
1188 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
1189 *** 'string-rectangle' provides on-the-fly preview of the result.
1192 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
1193 These should be used in preference to 'font-lock-fontify-buffer' when
1197 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
1198 to 'minibuffer-setup-hook'.
1200 If the first argument of the macro is of the form '(:append FUN)',
1201 then FUN will be appended to 'minibuffer-setup-hook', instead of
1206 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
1209 *** 'pcase' accepts the new UPattern 'cl-struct'.
1211 ** Calendar and diary
1214 *** The default 'diary-file' is now located in .emacs.d.
1217 *** New commands to insert diary entries with Chinese dates:
1218 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
1219 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
1222 *** The calendar can now list and mark diary entries with Chinese dates.
1223 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
1226 *** The option 'calendar-mode-line-format' can now be nil,
1227 which means to do nothing special with the mode line in calendars.
1230 *** New option 'calendar-weekend-days'.
1231 The option customizes which day headers receive the
1232 'calendar-weekend-header' face.
1235 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
1238 *** Many items obsolete since at least version 23.1 have been removed.
1239 The majority were function/variable/face aliases, too numerous to list here.
1242 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
1243 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
1245 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
1247 **** Macro 'calendar-for-loop'.
1249 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
1251 **** The nil and list forms of 'diary-display-function'.
1254 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
1255 If the output of ERT tests in batch mode execution can be saved to a
1256 log file, then it can be passed as an argument to the above function
1257 to produce a neat summary.
1260 ** New js.el option 'js-indent-first-init'.
1265 ** Info mode now displays symbol names in fixed-pitch font.
1266 If you want to get the old behavior back, customize the 'Info-quoted'
1267 face to use the same definitions as the default face.
1270 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
1273 *** 'info-display-manual' can now be given a prefix argument which (any
1274 non-nil value) directs the command to limit the completion
1275 alternatives to currently visited manuals.
1278 ** ntlm.el has support for NTLM2.
1283 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
1284 to delete or undelete multiple messages.
1287 *** Rmail can now render HTML mail messages if your Emacs was built with
1288 libxml2 or if you have the Lynx browser installed. By default, Rmail
1289 will display the HTML version of a mail message that has both HTML and
1290 plain text parts, if display of HTML email is possible; customize the
1291 'rmail-mime-prefer-html' option to 'nil' if you don't want that.
1294 *** In the commands that make summaries by subject, recipients, or senders,
1295 you can no longer use commas to separate regular expressions.
1298 ** SES now supports local printer functions; see 'ses-define-local-printer'.
1300 ** Shell-script Mode
1302 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
1303 specify the type of shell in use (bash, csh, etc).
1306 *** New value 'always' for 'sh-indent-after-continuation'.
1307 This provides old-style ("dumb") indentation of continued lines.
1308 See the doc string of 'sh-indent-after-continuation' for details.
1312 *** Fatal TLS errors are now silent by default.
1315 *** If Emacs isn't built with TLS support, an external TLS-capable
1316 program is used instead. This program used to be run in --insecure
1317 mode by default, but has now changed to be secure instead, and will
1318 fail if you try to connect to non-verifiable hosts. This is
1319 controlled by the 'tls-program' variable.
1324 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1325 When 'url-handler-mode' is enabled, file operations for these
1326 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1329 *** The URL package allows customizing the 'url-user-agent' string.
1330 The new 'url-user-agent' variable can be customized to be a string or
1334 *** The new interface variable 'url-request-noninteractive' can be used
1335 to specify that we're running in a noninteractive context, and that
1336 we should not be queried about things like TLS certificate validity.
1339 *** 'url-mime-accept-string' can now be used as in "interface"
1340 variable, meaning you can bind it around an 'url-retrieve' call.
1343 *** If URL is used with a https connection, the first callback argument
1344 plist will contain a :peer element that has the output of
1345 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
1350 *** New connection method "afp", which allows you to access Mac OS X
1351 volumes via the Apple Filing Protocol.
1354 *** New connection method "nc", which allows you to access dumb
1358 *** Method-specific parameters can be overwritten now with variable
1359 'tramp-connection-properties'.
1362 *** Handler for 'file-notify-valid-p' for remote machines that support
1363 filesystem notifications.
1368 *** New user variable 'sql-default-directory' enables remote
1369 connections using Tramp.
1372 *** New command 'sql-send-line-and-next'.
1373 This command, bound to 'C-c C-n' by default, sends the current line to
1374 the SQL process and advances to the next line, skipping whitespace and
1378 *** Added support for Vertica SQL.
1380 ** VC and related modes
1383 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
1384 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1385 (undocumented) command vc-hg-push now behaves slightly differently.
1388 *** The new command vc-region-history shows the log+diff of the active region.
1391 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
1392 This command is useful when you perform version control commands
1393 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1394 back-end for the buffer's file, or remove it from version control.
1397 *** New option 'vc-annotate-background-mode' controls whether
1398 the color range from 'vc-annotate-color-map' is applied to the
1399 background or to the foreground.
1402 *** New options for customizing encoding of Git commit log messages.
1403 The new user options 'vc-git-commits-coding-system' and
1404 'vc-git-log-output-coding-system' specify the encoding of log messages
1405 sent to Git when committing, and the decoding of log messages read
1406 from Git history commands. These options default to UTF-8; if
1407 customized, they should be consistent with the Git config variables
1408 i18n.commitEncoding and i18n.logOutputEncoding.
1409 ('vc-git-commits-coding-system' existed previously, but was a
1410 variable, not a user option.)
1413 *** 'compare-windows' now compares text with the most recently selected window
1414 instead of the next window. If you want the previous behavior of
1415 comparing with the next window, customize the new option
1416 'compare-windows-get-window-function' to the value
1417 'compare-windows-get-next-window'.
1420 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
1421 replace the face 'compare-windows', which is now an obsolete alias for
1422 'compare-windows-added'.
1425 *** The VC state indicator in the mode line now has different faces
1426 corresponding to each of the possible states. See the 'vc-faces'
1427 customization group.
1430 *** 'log-edit-insert-changelog' converts "(tiny change)" to
1431 "Copyright-paperwork-exempt: yes". Set 'log-edit-rewrite-tiny-change'
1432 nil to disable this.
1435 *** vc-mcvs.el has been removed.
1438 ** VHDL mode now supports VHDL'08.
1443 *** Decimal display mode uses "," groups, so it's more
1444 fitting for use in money calculations
1447 *** Factorial works with non-integer inputs.
1452 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1453 macro argument expansion, interactive macro evaluation and automatic
1454 scanning of #define'd symbols.
1457 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
1458 result of evaluating a macro.
1461 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
1462 all defined symbols in 'hide-ifdef-env'.
1465 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
1466 file name patterns. Defaults to files whose extension is one of '.h',
1467 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
1470 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
1471 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1472 (This could happen when an idempotent header file is visited again,
1473 when its guard symbol is already defined.) Defaults to 't'.
1476 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
1477 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1478 looking for macro definitions. By default, no symbols are ignored.
1483 *** New custom variable 'tex-print-file-extension' to help users who
1484 use PDF instead of DVI.
1487 *** TeX mode now supports Prettify Symbols mode. When enabling
1488 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1489 many other math macros are displayed using unicode characters.
1492 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
1493 By default, 32 consecutive spaces or four consecutive TABs are
1494 considered to be too deep, but the new variable
1495 'whitespace-big-indent-regexp' can be customized to change that.
1498 ** New options in 'tildify-mode'.
1499 New options 'tildify-space-string', 'tildify-pattern', and
1500 'tildify-foreach-region-function' variables make
1501 'tildify-string-alist', 'tildify-pattern-alist', and
1502 'tildify-ignored-environments-alist' variables (as well as a few
1503 helper functions) obsolete.
1506 ** New package Xref replaces Etags's front-end and UI
1508 The new package Xref provides a generic framework and new commands to
1509 find and move to definitions of functions, macros, data structures
1510 etc., as well as go back to the location where you were before moving
1511 to a definition. It supersedes and obsoletes many Etags commands,
1512 while still using the etags.el code that reads the TAGS tables as one
1515 The command 'xref-find-definitions' replaces 'find-tag' and provides
1516 an interface to pick one definition among several.
1517 'tags-loop-continue' is now unbound. 'xref-pop-marker-stack' replaces
1518 'pop-tag-mark', but has a keybinding ('M-,') different from the one
1519 'pop-tag-mark' used.
1521 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
1522 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
1523 'xref-find-apropos' replaces 'find-tag-regexp'.
1525 As a result of this, the following commands are now obsolete:
1526 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
1529 'tags-loop-continue' is not obsolete because it's still useful in
1530 'tags-search' and 'tags-query-replace', for which there are no direct
1534 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
1535 replaced by xref-style commands, see the "Dired" section below.
1540 'find-tag-marker-ring-length' is now an obsolete alias for
1541 'xref-marker-ring-length'. 'find-tag-marker-ring' is now an obsolete
1542 alias for a private variable. 'xref-push-marker-stack' and
1543 'xref-pop-marker-stack' should be used instead to manipulate the stack
1544 of searches for definitions.
1547 *** 'xref-find-definitions' and 'describe-function' now display
1548 information about mode local overrides (defined by cedet/mode-local.el
1549 'define-overloadable-function' 'define-mode-local-overrides').
1551 The framework's Lisp API is still experimental and can change in major,
1552 backward-incompatible ways.
1555 ** New package Project
1557 The new package Project provides generic infrastructure for dealing
1558 with projects. The main commands included in it are
1559 'project-find-file' and 'project-find-regexp'.
1561 The Lisp API of this package is still experimental.
1564 EUDC's LDAP backend has been improved.
1567 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1570 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1571 subprocess instead of on the command line.
1574 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1575 need to configure this manually anymore.
1578 *** The LDAP configuration section of EUDC's manual has been
1581 There have also been customization changes.
1584 *** New custom variable 'eudc-server-hotlist' to allow specifying
1585 multiple EUDC servers in init file.
1588 *** Custom variable 'eudc-inline-query-format' defaults to completing
1589 on email and firstname instead of surname.
1592 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
1593 to avoid interfering with the kill ring.
1596 *** Custom variable 'eudc-inline-expansion-format' defaults to
1597 "Firstname Surname <mail-address>".
1600 *** Custom variable 'eudc-options-file' defaults to
1601 "~/.emacs.d/eudc-options".
1604 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
1605 allow overriding the regular expression that recognizes the ldapsearch
1606 command line's password prompt.
1609 EUDC's BBDB backend now supports BBDB 3.
1612 EUDC's PH backend (eudcb-ph.el) is obsolete.
1617 *** The new built-in command 'clear' can scroll window contents out of sight.
1618 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1621 *** New buffer syntax '#<buffer-name>', which is equivalent to
1622 '#<buffer buffer-name>'. This shorthand makes interacting with
1623 buffers from eshell more convenient. Custom variable
1624 'eshell-buffer-shorthand', which has been broken for a while, has been
1628 *** By default, eshell "visual" program buffers (created by
1629 'eshell-visual-commands' and similar custom vars) are no longer killed
1630 when their processes die. This fixes issues with short-lived commands
1631 and makes visual programs more useful in general. For example, if
1632 "git log" is a visual command, it will always show the visual command
1633 buffer, even if the "git log" process dies. For the old behavior,
1634 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
1639 *** Support for the Google Chrome web browser.
1642 *** Support for the Conkeror web browser.
1645 *** Support for several ancient browsers is now officially obsolete.
1648 ** tar-mode: new 'tar-new-entry' command, allowing for new members to
1649 be added to the archive.
1654 *** Dired buffers are also auto-reverted via file notifications, if
1655 Emacs is compiled with file notification support.
1658 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
1659 See <http://debbugs.gnu.org/22814>.
1661 ** File Notifications
1664 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1667 *** The new event 'stopped' signals, that a file notification watch is
1668 not active any longer.
1671 *** The new function 'file-notify-valid-p' checks, whether a file
1672 notification descriptor still corresponds to an activate watch.
1677 *** The command 'dired-do-compress' bound to 'Z' now can compress
1678 directories and decompress zip files.
1681 *** New command 'dired-do-compress-to' bound to 'c' can be used to
1682 compress many marked files into a single named archive. The
1683 compression command is determined from the new
1684 'dired-compress-files-alist' variable.
1687 *** New user interface for the 'A' and 'Q' commands.
1688 These keys, now bound to 'dired-do-find-regexp' and
1689 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
1690 and 'xref-query-replace-in-results': they present the matches
1691 in the '*xref*' buffer and let you move through the matches. No need
1692 to use 'tags-loop-continue' to resume the search or replace loop. The
1693 previous commands, 'dired-do-search' and
1694 'dired-do-query-replace-regexp', are still available, but not bound to
1695 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
1696 back. We intend to obsolete the old commands in a future release.
1698 ** Tabulated List Mode
1701 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
1702 call 'tabulated-list-init-header', in which case it will have no
1706 *** 'tabulated-list-print' takes a second optional argument, update,
1707 which specifies an alternative printing method which is faster when
1708 few or no entries have changed.
1710 ** Obsolete packages
1716 *** landmark.el (moved to elpa.gnu.org)
1719 * New Modes and Packages in Emacs 25.1
1722 ** pinentry.el allows GnuPG passphrase to be prompted through the
1723 minibuffer instead of a graphical dialog, depending on whether the gpg
1724 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1725 is set). This feature requires newer versions of GnuPG (2.1.5 or
1726 later) and Pinentry (0.9.5 or later). To use this feature, add
1727 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1728 configuration with "gpgconf --reload gpg-agent".
1731 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1732 The main entry points are 'cl-defgeneric' and 'cl-defmethod'. See the
1733 node "Generic Functions" in the Emacs Lisp manual for more details.
1736 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1737 SCSS (Sassy CSS) files.
1740 ** let-alist is a new macro (and a package) that allows one to easily
1741 let-bind the values stored in an alist.
1744 ** 'tildify-mode' allows automatic insertion of hard spaces as one
1745 types the text. Breaking line after a single-character words is
1746 forbidden by Czech and Polish typography (and may be discouraged in
1747 other languages), so 'auto-tildify-mode' makes it easier to create
1748 a typographically-correct documents.
1751 ** The 'seq' library adds sequence manipulation functions and macros
1752 that complement basic functions provided by subr.el. All functions
1753 are prefixed with 'seq-' and work on lists, strings and vectors.
1754 'pcase' accepts a new Upattern 'seq'.
1757 ** The 'map' library provides map-manipulation functions that work on
1758 alists, hash-table and arrays. All functions are prefixed with
1759 'map-'. 'pcase' accepts a new UPattern 'map'.
1762 ** The 'thunk' library provides functions and macros to control the
1763 evaluation of forms.
1766 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1767 support for JSX, an XML-like syntax extension to ECMAScript.
1770 * Incompatible Lisp Changes in Emacs 25.1
1773 ** 'setq' and 'setf' must now be called with an even number of
1774 arguments. The earlier behavior of silently supplying a nil to the
1775 last variable when there was an odd number of arguments has been
1779 ** 'syntax-begin-function' is declared obsolete.
1780 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1781 slot in font-lock-defaults.
1784 ** The new implementation of Subword mode affects word movement everywhere.
1785 When Subword mode is turned on, 'forward-word', 'backward-word', and
1786 everything that uses them will move by sub-words, effectively
1787 overriding the buffer's syntax table. Lisp programs that shouldn't be
1788 affected by Subword mode should call the new functions
1789 'forward-word-strictly' and 'backward-word-strictly' instead.
1792 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
1793 called during startup. Users who call this function in their init
1794 file and still expect it to be run after startup should set
1795 'package-enable-at-startup' to t after the call to
1796 'package-initialize'.
1799 ** ':global' minor mode use 'setq-default' rather than 'setq'.
1800 This means that you can't use 'make-local-variable' and expect them to
1801 "magically" become buffer-local.
1804 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
1805 The 'track-mouse' form no longer refrains from changing the shape of
1806 the mouse pointer for the entire time the body of that form is
1807 executed. Lisp programs that use 'track-mouse' for dragging across
1808 large portions of the Emacs display, and want to avoid changes in the
1809 pointer shape during dragging, should bind the variable 'track-mouse'
1810 to the special value 'dragging' in the body of the form.
1813 ** The optional 'predicate' argument of 'lisp-complete-symbol' no longer
1814 has any effect. (This change was made in Emacs 24.4 but was not
1815 advertised at the time.)
1818 ** 'indirect-function' does not signal 'void-function' any more.
1819 This is mostly a bug-fix, since this change was missed back in 24.4 when
1820 symbol-function was changed not to signal 'void-function' any more.
1823 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
1826 ** M-x shell and M-x compile no longer set the EMACS environment variable.
1827 This avoids clashing when other programs use the variable for other purposes.
1828 Although M-x term still sets EMACS for compatibility with Bash 4.3 and earlier,
1829 this is deprecated and will be phased out when Bash 4.4 or later takes over.
1830 Use the INSIDE_EMACS environment variable instead.
1833 ** 'save-excursion' does not save&restore the mark any more.
1834 Use 'save-mark-and-excursion' if you want the old behavior.
1837 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
1838 argument ('predicate').
1841 ** 'completion-table-dynamic' by default stays in the minibuffer.
1842 The minibuffer will be the current buffer when the function is called.
1843 If you want the old behavior of calling the function in the buffer
1844 from which the minibuffer was entered, use the new argument
1845 'switch-buffer' to 'completion-table-dynamic'.
1848 ** window-configurations no longer record the buffers' marks.
1851 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1852 active region handling.
1855 ** deactivate-mark is now buffer-local.
1858 ** 'cl-the' now asserts that its argument is of the given type.
1861 ** 'process-running-child-p' may now return a numeric process
1862 group ID instead of 't'.
1865 ** Mouse click events on mode line or header line no longer include
1866 any reference to a buffer position. The 6th member of the mouse
1867 position list returned for such events is now nil.
1870 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1871 These slots used to hold key-shortcut data, but have been obsolete since
1875 ** Emacs no longer downcases the first letter of a system diagnostic
1876 when signaling a file error. For example, it now reports "Permission
1877 denied" instead of "permission denied". The old behavior was problematic
1878 in languages like German where downcasing rules depend on grammar.
1881 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
1882 Set it to 'curve' for curved single quotes, to 'straight' for straight
1883 apostrophes, and to 'grave' for grave accent and apostrophe. The
1884 default value nil acts like 'curve' if curved single quotes are
1885 displayable, and like 'grave' otherwise. The new variable affects
1886 display of diagnostics and help, but not of info.
1889 ** substitute-command-keys now replaces quotes.
1890 That is, it converts documentation strings' quoting style as per the
1891 value of 'text-quoting-style'. Doc strings in source code can use
1892 either curved single quotes or grave accents and apostrophes. As
1893 before, characters preceded by \= are output as-is.
1896 ** Message-issuing functions 'error', 'message', etc. now convert quotes.
1897 They use the new 'format-message' function instead of plain 'format',
1898 so that they now follow user preference as per 'text-quoting-style'
1899 when processing curved single quotes, grave accents, and apostrophes
1900 in their format argument.
1903 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1904 now match multibyte characters using Unicode character properties.
1905 If you want the old behavior where they matched any character with
1906 word syntax, use '\sw' instead.
1909 ** The character classes [:graph:] and [:print:] in regular expressions
1910 no longer match every multibyte character. Instead, Emacs now
1911 consults the Unicode character properties to determine which
1912 characters are graphic or printable. In particular, surrogates and
1913 unassigned codepoints are now rejected. If you want the old behavior,
1914 use [:multibyte:] instead.
1917 ** The 'diff' command uses the unified format now. To restore the old
1918 behavior, set 'diff-switches' to '-c'.
1921 ** 'grep-template' and 'grep-find-template' values don't include the
1922 --color argument anymore. It's added at the <C> place holder position
1923 dynamically. Any third-party code that changes these templates should
1924 be updated accordingly.
1927 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
1928 The new behavior is compatible with Common Lisp and with XEmacs.
1929 This change does not affect Lisp code intended to be portable to
1930 Emacs 24.2 and earlier, which did not support unary '/'.
1933 ** The 'default-directory' value doesn't have to end slash. To make
1934 that happen, 'unhandled-file-name-directory' now defaults to calling
1935 'file-name-as-directory'.
1938 * Lisp Changes in Emacs 25.1
1942 *** New UPatterns 'quote', 'app'.
1944 *** New UPatterns can be defined with 'pcase-defmacro'.
1946 *** New vector QPattern.
1949 ** syntax-propertize is now automatically called on-demand during forward
1950 parsing functions like 'forward-sexp'.
1953 ** New hooks 'prefix-command-echo-keystrokes-functions' and
1954 'prefix-command-preserve-state-hook' allow the definition of prefix
1955 commands other than the predefined 'C-u'.
1958 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
1959 These allow conversion between buffer positions and the corresponding
1960 file byte offsets, given the file's encoding.
1963 ** The default value of 'load-read-function' is now 'read'.
1964 Previously, the default value of 'nil' implied using 'read'.
1967 ** New hook 'pre-redisplay-functions'.
1968 It is a bit easier to use than 'pre-redisplay-function'.
1971 ** The second arg of 'looking-back' should always be provided explicitly.
1972 Previously, it was an optional argument, now it's mandatory.
1975 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
1976 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
1977 implemented by the new 'cursor-intangible-mode' and
1978 'cursor-sensor-mode' minor modes.
1981 ** 'inhibit-point-motion-hooks' now defaults to 't' and is obsolete.
1982 Use the new minor modes 'cursor-intangible-mode' and
1983 'cursor-sensor-mode' instead.
1986 ** New process type 'pipe', which can be used in combination with the
1987 ':stderr' keyword of make-process to handle standard error output
1991 ** New function 'make-process' provides an alternative interface to
1992 'start-process'. It allows programs to set process parameters such as
1993 process filter, sentinel, etc., through keyword arguments (similar to
1994 'make-network-process').
1997 ** A new function 'directory-files-recursively' returns all matching
1998 files (recursively) under a directory.
2001 ** New variable 'inhibit-message', when bound to non-nil, inhibits
2002 'message' and related functions from displaying messages in the echo
2003 area. The output is still logged to the *Messages* buffer.
2006 ** A new text property 'inhibit-read-only' can be used in read-only
2007 buffers to allow certain parts of the text to be writable.
2010 ** A new variable 'comment-end-can-be-escaped' is useful in languages
2011 such as C and C++ where line comments with escaped newlines are
2012 continued to the next line.
2015 ** New macro 'define-advice'.
2018 ** Emacs Lisp now supports generators.
2019 See the "Generators" section of the ELisp manual for the details.
2022 ** New finalizer facility for running code when objects become unreachable.
2023 See the "Finalizer Type" subsection in the ELisp manual for the
2027 ** lexical closures can use (:documentation FORM) to build their docstring.
2028 It should be placed right where the docstring would be, and FORM is then
2029 evaluated (and should return a string) when the closure is built.
2032 ** define-inline provides a new way to define inlinable functions.
2035 ** New function 'macroexpand-1' to perform a single step of macro expansion.
2038 ** Some "x-*" functions were obsoleted and/or renamed:
2039 *** x-select-text is renamed gui-select-text.
2040 *** x-selection-value is renamed gui-selection-value.
2041 *** x-get-selection is renamed gui-get-selection.
2042 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
2043 *** x-get-selection-value is renamed to gui-get-primary-selection.
2044 *** x-set-selection is renamed to gui-set-selection
2047 ** New function 'string-greaterp', which return the opposite result of
2051 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
2052 preserve the collation order as defined by the system's locale(1)
2053 environment. For the time being this is implemented for modern POSIX
2054 systems and for MS-Windows, for other systems they fall back to their
2055 counterparts 'string-lessp' and 'string-equal'.
2058 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
2059 The effect is that, on systems that use ls-lisp for Dired, the default
2060 sort order of the files in Dired is now different from what it was in
2061 previous versions of Emacs. In particular, the file names are sorted
2062 disregarding punctuation, accents, and diacritics, and letter case is
2063 ignored. For example, files whose name begin with a period will no
2064 longer appear near the beginning of the directory listing. If you
2065 want the old, locale-independent sorting, customize the new option
2066 'ls-lisp-use-string-collate' to the nil value.
2069 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
2070 if set to a non-nil value, causes the above 2 functions to ignore
2071 symbol and punctuation characters when collating strings. This
2072 emulates the behavior of modern Posix platforms when the locale's
2073 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
2074 MS-Windows doesn't support UTF-8 as codeset in its locales.
2077 ** New function 'alist-get', which is also a valid place (aka lvalue).
2080 ** New function 'funcall-interactively', which works like 'funcall'
2081 but makes 'called-interactively-p' treat the function as (you guessed it)
2082 called interactively.
2085 ** New function 'function-put' to use instead of 'put' for function properties.
2088 ** The new function 'bidi-find-overridden-directionality' allows you to
2089 find characters whose directionality was, perhaps maliciously,
2090 overridden by directional override control characters. Lisp programs
2091 can use this to detect potential phishing of URLs and other links that
2092 exploits bidirectional display reordering.
2095 ** The new function 'buffer-substring-with-bidi-context' allows you to
2096 copy a portion of a buffer into a different location while preserving
2097 the visual appearance both of the copied text and the text at
2098 destination, even when the copied text includes mixed bidirectional
2099 text and directional control characters.
2102 ** New properties that can be specified with 'declare':
2103 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
2104 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
2105 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
2109 ** New macro 'with-file-modes', for evaluating expressions with default file
2110 permissions set to temporary values (e.g., for creating private files).
2113 ** You can access the slots of structures using 'cl-struct-slot-value'.
2116 ** Function 'sort' can deal with vectors.
2119 ** Function 'system-name' now returns an updated value if the current
2120 system's name has changed or if the Emacs process has changed systems,
2121 and to avoid long waits it no longer consults DNS to canonicalize the
2122 name. The variable 'system-name' is now obsolete.
2125 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
2128 ** If 'pwd' is called with a prefix argument, insert the current default
2132 ** New functions return extended information about fonts and faces.
2135 *** The function 'font-info' now returns more details about a font.
2136 In particular, it now returns the average width of the font's
2137 characters, which can be used for geometry-related calculations.
2140 *** A new function 'default-font-width' returns the average width of a
2141 character in the current buffer's default font. If the default face
2142 is remapped (see 'face-remapping-alist'), the value for the remapped
2143 face is returned. This function complements the existing function
2144 'default-font-height'.
2147 *** New functions 'window-font-height' and 'window-font-width' return
2148 the height and average width of characters in a specified face and
2149 window. If FACE is remapped (see 'face-remapping-alist'), the
2150 function returns the information for the remapped face.
2153 *** A new function 'window-max-chars-per-line' returns the maximal
2154 number of characters that can be displayed on one line. If a face
2155 and/or window are provided, these values are used for the
2156 calculation. This function is different from 'window-body-width' in
2157 that it accounts for (i) continuation glyphs, (ii) the size of the
2158 font, and (iii) the specified window.
2161 ** New utilities in subr-x.el:
2162 *** New macros 'if-let' and 'when-let' allow defining bindings and to
2163 execute code depending whether all values are true.
2164 *** New macros 'thread-first' and 'thread-last' allow threading a form
2165 as the first or last argument of subsequent forms.
2168 ** Documentation strings now support quoting with curved single quotes
2169 in addition to the old style with grave accent and apostrophe. The
2170 new style looks better on today's displays. In the new Electric Quote
2171 mode, you can enter curved single quotes into documentation by typing
2172 grave accent and apostrophe. Outside Electric Quote mode, you can
2173 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
2174 works) by typing 'A-[' and 'A-]'. As described above under
2175 'text-quoting-style', the user can specify how to display doc string
2179 ** New function 'format-message' is like 'format' and also converts
2180 curved single quotes, grave accents and apostrophes as per
2181 'text-quoting-style'.
2184 ** show-help-function's arg is converted via substitute-command-keys
2185 before being passed to the function. Help strings, help-echo
2186 properties, etc. can therefore contain command key escapes and
2190 ** Time-related changes:
2192 *** Time conversion functions now accept an optional ZONE argument
2193 that specifies the time zone rules for conversion. ZONE is omitted or
2194 nil for Emacs local time, t for Universal Time, 'wall' for system wall
2195 clock time, or a string as in the TZ environment variable. The
2196 affected functions are 'current-time-string', 'current-time-zone',
2197 'decode-time', and 'format-time-string'. The function 'encode-time',
2198 which already accepted a simple time zone rule argument, has been
2199 extended to accept all the new forms.
2201 *** Incompatible change in the third argument of 'format-time-string'.
2202 Previously, any non-nil argument was interpreted as specifying Universal Time.
2203 This is no longer true; packages that want Universal Time should pass t
2204 as the third argument.
2206 *** Time-related functions now consistently accept numbers
2207 (representing seconds since the epoch) and nil (representing the
2208 current time) as well as the usual list-of-integer representation.
2209 Affected functions include 'current-time-string', 'current-time-zone',
2210 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
2211 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
2212 'time-to-days', and 'time-to-seconds'.
2214 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
2217 *** 'calendar-next-time-zone-transition', 'time-add', and
2218 'time-subtract' no longer return time values in the obsolete and
2219 undocumented integer-pair format. Instead, they return a list of two
2223 ** New function 'set-binary-mode' allows switching a standard stream
2224 of the Emacs process to binary I/O mode.
2227 ** The new function 'directory-name-p' can be used to check whether a file
2228 name (as returned from, for instance, 'file-name-all-completions') is
2229 a directory file name. It returns non-nil if the last character in
2230 the name is a directory separator character (forward slash on GNU and
2231 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2234 ** ASCII approximations to curved quotes are put in standard-display-table
2235 if the terminal cannot display curved quotes.
2238 ** Standard output and error streams now transliterate characters via
2239 standard-display-table, and encode output using locale-coding-system.
2240 To force a specific encoding, bind 'coding-system-for-write' to the
2241 coding-system of your choice when invoking functions like 'prin1' and
2245 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
2248 ** New possible value for 'system-type': 'nacl'.
2249 This is used by Google's Native Client (NaCl).
2251 ** Miscellaneous name change
2254 For consistency with the usual Emacs spelling, the Lisp variable
2255 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
2256 The old name should still work, as an obsolescent alias.
2258 ** Changes in Frame- and Window- Handling
2261 *** Emacs can now draw horizontal scroll bars on some platforms that
2262 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2263 Horizontal scroll bars are turned off by default.
2265 **** New function 'horizontal-scroll-bars-available-p' telling whether
2266 horizontal scroll bars are available on the underlying system.
2268 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
2269 bars on all existing and future frames.
2271 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
2272 scroll bars on the selected frame.
2274 **** New frame parameters 'horizontal-scroll-bars' and
2275 'scroll-bar-height' to set horizontal scroll bars and their height
2276 for individual frames and in 'default-frame-alist'.
2278 **** New functions 'frame-scroll-bar-height' and
2279 'window-scroll-bar-height' return the height of horizontal scroll
2280 bars on a specific frame or window.
2282 **** 'set-window-scroll-bars' now accepts five parameters where the last
2283 two specify height and type of the window's horizontal scroll bar.
2285 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
2288 **** New buffer-local variables 'horizontal-scroll-bar' and
2289 'scroll-bar-height'.
2292 *** New functions 'frame-geometry' and 'frame-edges' give access to a
2296 *** New functions 'mouse-absolute-pixel-position' and
2297 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
2301 *** The function 'window-edges' now accepts three additional arguments to
2302 retrieve body, absolute and pixel edges of the window.
2305 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
2306 'window-inside-absolute-pixel-edges' have been renamed to respectively
2307 'window-body-edges', 'window-body-pixel-edges' and
2308 'window-absolute-body-pixel-edges'. The old names are kept as aliases.
2311 *** New function 'window-absolute-pixel-position' to get the screen
2312 coordinates of a visible buffer position.
2315 *** The height of a frame's menu and tool bar are no longer counted in the
2316 frame's text height. This means that the text height stands only for
2317 the height of the frame's root window plus that of the echo area (if
2318 present). This was already the behavior for frames with external tool
2319 and menu bars (like in the Gtk builds) but has now been extended to all
2323 *** Frames now do not necessarily preserve the number of columns or lines
2324 they display when setting default font, menu bar, fringe width, or
2325 scroll bars. In particular, maximized and fullscreen frames are
2326 conceptually never resized if such settings change. For fullheight and
2327 fullwidth frames, the behavior may depend on the toolkit used.
2328 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
2329 setting default font, menu bar, fringe width, or scroll bars of a
2330 specific frame does not resize that frame in order to preserve the
2331 number of columns or lines it displays.
2334 *** New function 'window-preserve-size' allows you to preserve the size of
2335 a window without "fixing" it. It's supported by 'fit-window-to-buffer',
2336 'temp-buffer-resize-mode' and 'display-buffer'.
2339 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
2340 This displays the buffer in an existing frame other than the current
2341 frame, and allows the caller to specify a frame predicate to exclude
2345 *** New minor mode 'window-divider-mode' and options
2346 'window-divider-default-places', 'window-divider-default-bottom-width'
2347 and 'window-divider-default-right-width'.
2350 *** The window displaying the '*Completions*' buffer with minibuffer
2351 completion candidates is now shown at the bottom of the selected
2352 frame. The size of that window is always as large as required to
2353 display all the candidates, except when limited by the minimum size
2354 of the other windows on that frame; those other windows are resized
2355 to provide space for the '*Completions*' display. The Emacs manual
2356 describes how to customize 'display-buffer-alist' to get back the old
2357 behavior, see the node "Temporary Displays" there.
2360 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2361 Those features have been deprecated in Gtk+ for a long time.
2366 *** etags no longer qualifies class members by default.
2368 By default, 'etags' will not qualify class members for Perl and C-like
2369 object-oriented languages with their class names and namespaces, and
2370 will remove qualifications used explicitly in the code from the tag
2371 names it puts in TAGS files. This is so the etags.el back-end for
2372 'xref-find-definitions' is more accurate and produces less false
2375 Use --class-qualify (-Q) if you want the old default behavior of
2376 qualifying class members in C++, Java, Objective C, and Perl. Note
2377 that using -Q might make some class members become "unknown" to 'M-.'
2378 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
2379 qualified names by hand.
2382 *** New language Ruby
2384 Names of modules, classes, methods, functions, and constants are
2385 tagged. Overloaded operators are also tagged.
2389 Names of packages, functions, and types are tagged.
2392 *** Improved support for Lua
2394 Etags now tags functions even if the "function" keyword follows some
2395 whitespace at line beginning.
2398 * Changes in Emacs 25.1 on Non-Free Operating Systems
2401 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2402 This includes the makefile.w32-in files in various subdirectories, and
2403 the support files. The file nt/configure.bat now just tells the user
2404 to use the procedure described in nt/INSTALL, by running the Posix
2405 'configure' script in the top-level directory.
2408 ** Building Emacs for MS-Windows requires at least Windows XP
2409 or Windows Server 2003. The built binaries still run on all versions
2410 of Windows starting with Windows 9X.
2413 ** Emacs running on MS-Windows now supports the daemon mode.
2416 ** The byte counts in etags-generated TAGS files are now the same on
2417 MS-Windows as they are on other platforms.
2420 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2421 Pass '--without-ns' to configure to create an X11 build, the old default.
2424 ** OS X 10.5 or older is no longer supported.
2427 ** OS X on PowerPC is no longer supported.
2430 ** New variable 'ns-use-fullscreen-animation' controls animation for
2431 non-native NS fullscreen. The default is nil. Set to t to enable
2432 animation when entering and leaving fullscreen. For native OSX fullscreen
2436 ** The new function 'w32-application-type' returns the type of an
2437 MS-Windows application given the name of its executable program file.
2439 ** New variable 'w32-pipe-buffer-size'.
2440 It can be used to tune the size of the buffer of pipes created for
2441 communicating with subprocesses, when the program run by a subprocess
2442 exhibits unusual buffering behavior. Default is zero, which lets the
2443 OS use its default size.
2446 ----------------------------------------------------------------------
2447 This file is part of GNU Emacs.
2449 GNU Emacs is free software: you can redistribute it and/or modify
2450 it under the terms of the GNU General Public License as published by
2451 the Free Software Foundation, either version 3 of the License, or
2452 (at your option) any later version.
2454 GNU Emacs is distributed in the hope that it will be useful,
2455 but WITHOUT ANY WARRANTY; without even the implied warranty of
2456 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2457 GNU General Public License for more details.
2459 You should have received a copy of the GNU General Public License
2460 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2466 paragraph-separate: "[
\f]*$"