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 ** `find-library' now takes a prefix argument to pop to a different
63 ** `find-library', `help-function-def' and `help-variable-def' now run
64 `find-function-after-hook'.
67 ** 'process-attributes' on Darwin systems now returns more information.
70 ** Several accessors for the value returned by 'file-attributes'
71 have been added. They are: 'file-attribute-type',
72 'file-attribute-link-number', 'file-attribute-user-id',
73 'file-attribute-group-id', 'file-attribute-access-time',
74 'file-attribute-modification-time',
75 'file-attribute-status-change-time', 'file-attribute-size',
76 'file-attribute-modes', 'file-attribute-inode-number', and
77 'file-attribute-device-number'.
80 ** The new function 'buffer-hash' computes compute a fast, non-consing
81 hash of a buffer's contents.
84 ** 'fill-paragraph' no longer marks the buffer as changed unless it
85 actually changed something.
88 ** The locale language name 'ca' is now mapped to the language
89 environment 'Catalan', which has been added.
92 ** 'align-regexp' has a separate history for its interactive argument.
93 'align-regexp' no longer shares its history with all other
94 history-less functions that use 'read-string'.
97 ** The networking code has been reworked so that it's more
98 asynchronous than it was (when specifying :nowait t in
99 'make-network-process'). How asynchronous it is varies based on the
100 capabilities of the system, but on a typical GNU/Linux system the DNS
101 resolution, the connection, and (for TLS streams) the TLS negotiation
102 are all done without blocking the main Emacs thread. To get
103 asynchronous TLS, the TLS boot parameters have to be passed in (see
104 the manual for details).
106 Certain process oriented functions (like 'process-datagram-address')
107 will block until socket setup has been performed. The recommended way
108 to deal with asynchronous sockets is to avoid interacting with them
109 until they have changed status to "run". This is most easily done
110 from a process sentinel.
112 ** 'make-network-process' and 'open-network-stream' sometimes allowed
113 :service to be an integer string (e.g., :service "993") and sometimes
114 required an integer (e.g., :service 993). This difference has been
115 eliminated, and integer strings work everywhere.
117 ** It is possible to disable attempted recovery on fatal signals.
119 Two new variables support disabling attempts to recover from stack
120 overflow and to avoid automatic auto-save when Emacs is delivered a
121 fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
122 will disable attempts to recover from C stack overflows; Emacs will
123 then crash as with any other fatal signal.
124 'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
125 disable attempts to auto-save the session and shut down in an orderly
126 fashion when Emacs receives a fatal signal; instead, Emacs will
127 terminate immediately. Both variables are non-'nil' by default.
128 These variables are for users who would like to avoid the small
129 probability of data corruption due to techniques Emacs uses to recover
133 ** A second dir-local file (.dir-locals-2.el) is now accepted.
134 See the variable 'dir-locals-file-2' for more information.
137 ** International domain names (IDNA) are now encoded via the new
138 puny.el library, so that one can visit web sites with non-ASCII URLs.
141 ** The new 'timer-list' command lists all active timers in a buffer,
142 where you can cancel them with the 'c' command.
145 ** The new function 'read-multiple-choice' prompts for multiple-choice
146 questions, with a handy way to display help texts.
149 * Editing Changes in Emacs 25.2
152 ** New bindings for 'query-replace-map'.
153 'undo', undo the last replacement; bound to 'u'.
154 'undo-all', undo all replacements; bound to 'U'.
157 * Changes in Specialized Modes and Packages in Emacs 25.2
162 *** Messages from CMake are now recognized.
167 *** In wdired, when editing files to contain slash characters,
168 the resulting directories are automatically created. Whether to do
169 this is controlled by the 'wdired-create-parent-directories' variable.
172 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
173 viewing HTML files and the like.
178 *** A new 's' command for switching to another eww buffer via the minibuffer.
181 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
182 with the 'o' command from 'image-map'.
185 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
186 whether to use the HTML-specified colors or not. The user can also
187 customize the 'shr-use-colors' variable.
190 *** Images that are being loaded are now marked with gray
191 "placeholder" images of the size specified by the HTML. They are then
192 replaced by the real images asynchronously, which will also now
193 respect width/height HTML specs (unless they specify widths/heights
194 bigger than the current window).
199 *** Images are automatically scaled before displaying based on the
200 'image-scaling-factor' variable (if Emacs supports scaling the images
204 *** Images inserted with 'insert-image' and related functions get a
205 keymap put into the text properties (or overlays) that span the
206 image. This keymap binds keystrokes for manipulating size and
207 rotation, as well as saving the image to a file. These commands are
208 also available in 'image-mode'.
211 *** A new library for creating and manipulating SVG images has been
212 added. See the "SVG Images" section in the lispref manual for
216 *** New setf-able function to access and set image parameters is
217 provided: 'image-property'.
220 ** The commands that add ChangeLog entries now prefer a VCS root directory
221 for the ChangeLog file, if none already exists. Customize
222 'change-log-directory-files' to nil for the old behavior.
225 ** Support for non-string values of 'time-stamp-format' has been removed.
230 *** 'message-use-idna' now defaults to t (because Emacs comes with
231 built-in IDNA support now).
234 *** The 'message-valid-fqdn-regexp' variable has been removed, since
235 there are now top-level domains added all the time. Message will no
236 longer warn about sending emails to top-level domains it hasn't heard
239 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
240 In 'visual-line-mode' it will look for the true beginning of a header
241 while in non-'visual-line-mode' it will move the point to the indented
247 *** New connection method "sg", which supports editing files under a
251 *** New connection method "doas" for OpenBSD hosts.
254 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
259 *** Support for completing attribute values and bang-rules using the
260 'completion-at-point' command.
263 ** Emacs now supports character name escape sequences in character and
264 string literals. The syntax variants \N{character name} and
265 \N{U+code} are supported.
268 ** Prog mode has some support for multi-mode indentation.
269 This allows better indentation support in modes that support multiple
270 programming languages in the same buffer, like literate programming
271 environments or ANTLR programs with embedded Python code.
273 A major mode can provide indentation context for a sub-mode through
274 the 'prog-indentation-context' variable. To support this, modes that
275 provide indentation should use 'prog-widen' instead of 'widen' and
276 'prog-first-column' instead of a literal zero. See the node
277 "Mode-Specific Indent" in the ELisp manual for more details.
281 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
287 *** The new function 'url-cookie-delete-cookie' can be used to
288 programmatically delete all cookies, or cookies from a specific
292 *** `url-retrieve-synchronously' now takes an optional timeout parameter.
295 *** The URL package now support HTTPS over proxies supporting CONNECT.
298 *** 'url-user-agent' now defaults to 'default', and the User-Agent
299 string is computed dynamically based on 'url-privacy-level'.
301 ** VC and related modes
304 *** The VC state indicator in the mode line now defaults to more
305 colorful faces to make it more obvious to the user what the state is.
306 See the 'vc-faces' customization group.
309 * New Modes and Packages in Emacs 25.2
312 * Incompatible Lisp Changes in Emacs 25.2
315 ** Resizing a frame no longer runs 'window-configuration-change-hook'.
316 Put your function on 'window-size-change-functions' instead.
318 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
319 mode to send the same escape sequences that xterm does. This makes
320 things like forward-word in readline work.
323 ** hideshow mode got four key bindings that are analogous to outline
324 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
326 ** The grep/rgrep/lgrep functions will now ask about saving files
327 before running. This is controlled by the 'grep-save-buffers'
331 * Lisp Changes in Emacs 25.2
333 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss.
335 ** Autoload files can be generated without timestamps,
336 by setting 'autoload-timestamps' to nil.
337 FIXME As an experiment, nil is the current default.
338 If no insurmountable problems before next release, it can stay that way.
340 ** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
344 ** 'gnutls-boot' now takes a parameter :complete-negotiation that says
345 that negotiation should complete even on non-blocking sockets.
348 ** New functions 'window-pixel-width-before-size-change' and
349 'window-pixel-height-before-size-change' support detecting which
350 window changed size when 'window-size-change-functions' are run.
353 ** New function 'display-buffer-reuse-mode-window' is an action function
354 suitable for use in 'display-buffer-alist'. For example, to avoid creating
355 a new window when opening man pages when there's already one, use
356 (add-to-list 'display-buffer-alist
357 '("\\`\\*Man .*\\*\\'" .
358 (display-buffer-reuse-mode-window
359 (inhibit-same-window . nil)
363 ** There is now a new variable 'flyspell-sort-corrections-function'
364 that allows changing the way corrections are sorted.
367 ** The new command 'fortune-message' has been added, which displays
368 fortunes in the echo area.
371 ** New function 'func-arity' returns information about the argument list
372 of an arbitrary function. This generalizes 'subr-arity' for functions
373 that are not built-in primitives. We recommend using this new
374 function instead of 'subr-arity'.
377 ** 'parse-partial-sexp' state has a new element. Element 10 is
378 non-nil when the last character scanned might be the first character
379 of a two character construct, i.e., a comment delimiter or escaped
380 character. Its value is the syntax of that last character.
383 ** 'parse-partial-sexp''s state, element 9, has now been confirmed as
384 permanent and documented, and may be used by Lisp programs. Its value
385 is a list of currently open parenthesis positions, starting with the
386 outermost parenthesis.
389 ** 'read-color' will now display the color names using the color itself
390 as the background color.
392 ** The function 'redirect-debugging-output' now works on platforms
393 other than GNU/Linux.
396 ** The new function 'string-version-lessp' compares strings by
397 interpreting consecutive runs of numerical characters as numbers, and
398 compares their numerical values. According to this predicate,
399 "foo2.png" is smaller than "foo12.png".
402 ** The new function 'char-from-name' converts a Unicode name string
403 to the corresponding character code.
406 ** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
407 Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
408 two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
409 ('sxhash-eql') on them will be the same.
412 ** Function 'sxhash' has been renamed to 'sxhash-equal' for
413 consistency with the new functions. For compatibility, 'sxhash'
414 remains as an alias to 'sxhash-equal'.
417 ** Time conversion functions that accept a time zone rule argument now
418 allow it to be OFFSET or a list (OFFSET ABBR), where the integer
419 OFFSET is a count of seconds east of Universal Time, and the string
420 ABBR is a time zone abbreviation. The affected functions are
421 'current-time-string', 'current-time-zone', 'decode-time',
422 'format-time-string', and 'set-time-zone-rule'.
425 * Changes in Emacs 25.2 on Non-Free Operating Systems
427 ** Intercepting hotkeys on Windows 7 and later now works better.
428 The new keyboard hooking code properly grabs system hotkeys such as
429 Win-* and Alt-TAB, in a way that Emacs can get at them before the
430 system. This makes the 'w32-register-hot-key' functionality work
431 again on all versions of MS-Windows starting with Windows 7. On
432 Windows NT and later you can now register any hotkey combination. (On
433 Windows 9X, the previous limitations, spelled out in the Emacs manual,
436 ** `convert-standard-filename' no longer mirrors slashes on MS-Windows.
437 Previously, on MS-Windows this function converted slash characters in
438 file names into backslashes. It no longer does that.
441 * Installation Changes in Emacs 25.1
444 ** Building Emacs now requires C99 or later.
447 ** Building Emacs now requires GNU make, version 3.81 or later.
450 ** New configure option --with-cairo.
451 This builds Emacs with Cairo drawing. As a side effect, it provides
452 support for built-in printing, when Emacs was built with GTK+.
453 Cairo drawing is an experimental feature in Emacs, and subject to
454 change in future releases.
457 ** New configure option --with-modules.
458 This enables support for loading dynamic modules; see below.
461 ** By default, Emacs no longer works on IRIX. We expect that Emacs
462 users are not affected by this, as SGI stopped supporting IRIX in
463 December 2013. If you are affected, please send a bug report. You
464 should be able to work around the problem either by porting the Emacs
465 undumping code to GCC under IRIX, or by configuring --with-wide-int,
466 or by sticking with Emacs 24.4.
469 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
470 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
471 since Emacs 24.4, and the other variants were undocumented and were
472 obstacles to maintenance and development. GC_MARK_STACK and its
473 related symbols have been removed from the C internals.
476 ** 'configure' now prefers gnustep-config when configuring GNUstep.
477 If gnustep-config is not available, the old heuristics are used.
480 ** 'configure' now prefers inotify to gfile for file notification,
481 unless gfile is explicitly requested via --with-file-notification='gfile'.
484 ** 'configure' detects the kqueue file notification library on *BSD
485 and Mac OS X machines.
488 ** The configure option '--with-pkg-config-prog' has been removed.
489 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
492 ** The configure option '--with-mmdf' has been removed.
493 It was no longer useful, as it relied on libraries that are no longer
494 supported, and its presence led to confusion during configuration.
495 This affects only the 'movemail' utility; Emacs itself can still
496 process MMDF-format files as before.
499 ** The configure option '--enable-silent-rules' is now the default,
500 and silent rules are now quieter. To get the old behavior where
501 'make' chatters a lot, configure with '--disable-silent-rules' or
502 build with 'make V=1'.
505 ** The configure option '--with-gameuser' now allows you to specify a
506 group instead of a user if its argument is prefixed by ':' (a colon).
507 This will cause the game score files in ${localstatedir}/games/emacs
508 to be owned by that group, and the helper program for updating them to
509 be installed setgid. The option now defaults to the 'games' group.
512 ** The 'grep-changelog' script (and its manual page) are no longer included.
513 It has no particular connection to Emacs and has not changed in years,
514 so if you want to use it, you can always take a copy from an older Emacs.
517 ** Emacs 25 comes with a new set of icons.
518 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
519 The old Emacs logo icons are available as 'emacs23.png' in the same location.
522 ** New make target 'check-expensive' to run additional tests.
523 This includes all tests which run via "make check", plus additional
524 tests which take more time to perform.
527 * Startup Changes in Emacs 25.1
530 ** When Emacs is given a file as a command line argument and
531 'initial-buffer-choice' is non-nil, display both the file and
532 'initial-buffer-choice'. When Emacs is given more than one file and
533 'initial-buffer-choice' is non-nil, show 'initial-buffer-choice'
534 and *Buffer List*. This makes Emacs convenient to use from the
535 command line when 'initial-buffer-choice' is non-nil.
538 ** The value of 'initial-scratch-message' is now treated as a doc string
539 and can contain escape sequences for command keys, quotes, and the like.
542 ** The default height of GUI frames was enlarged.
543 This is so there's enough space in the initial window to display the
544 optional text about recovering crashes sessions, without losing the
545 splash image display.
548 * Changes in Emacs 25.1
551 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
552 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
553 xwidget support, you can access the embedded webkit browser with 'M-x
554 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
555 browser. The buffer will have a new mode, 'xwidget-webkit-mode'
556 (similar to 'image-mode'), which supports the webkit widget.
559 *** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
560 'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
561 'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
562 'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
563 'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
564 'xwidget-webkit-scroll-up'.
567 ** Emacs can now load shared/dynamic libraries (modules).
568 A dynamic Emacs module is a shared library that provides additional
569 functionality for use in Emacs Lisp programs, just like a package
570 written in Emacs Lisp would. The functions 'load', 'require',
571 'load-file', etc. were extended to load such modules, as they do with
572 Emacs Lisp packages. The new variable 'module-file-suffix' holds the
573 system-dependent value of the file-name extension ('.so' on Posix
574 hosts) of the module files.
576 A module should export a C-callable function named
577 'emacs_module_init', which Emacs will call as part of the call to
578 'load' or 'require' which loads the module. It should also export a
579 symbol named 'plugin_is_GPL_compatible' to indicate that its code is
580 released under the GPL or compatible license; Emacs will refuse to
581 load modules that don't export such a symbol.
583 If a module needs to call Emacs functions, it should do so through the
584 API defined and documented in the header file 'emacs-module.h'. Note
585 that any module that provides Lisp-callable functions will have to use
586 Emacs functions such as 'fset' and 'funcall', in order to register its
587 functions with the Emacs Lisp interpreter.
589 Modules can create 'user-ptr' Lisp objects that embed pointers to C
590 structs defined by the module. This is useful for keeping around
591 complex data structures created by a module, to be passed back to the
592 module's functions. User-ptr objects can also have associated
593 "finalizers" -- functions to be run when the object is GC'ed; this is
594 useful for freeing any resources allocated for the underlying data
595 structure, such as memory, open file descriptors, etc. A new
596 predicate 'user-ptrp' returns non-nil if its argument is a 'user-ptr'
599 Loadable modules in Emacs are an experimental feature, and subject to
600 change in future releases. For that reason, their support is disabled
601 by default, and must be enabled by using the '--with-modules' option
605 ** Network security (TLS/SSL certificate validity and the like) is
606 added via the new Network Security Manager (NSM) and controlled via
607 the 'network-security-level' variable.
610 ** C-h l now also lists the commands that were run.
613 ** x-select-enable-clipboard is renamed select-enable-clipboard
614 and x-select-enable-primary is renamed select-enable-primary.
615 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
616 name it), with the proviso that on some systems (e.g. Windows)
617 select-enable-primary is ineffective since the system doesn't
618 have the equivalent of a primary selection.
621 ** New option 'switch-to-buffer-in-dedicated-window' allows you to
622 customize how 'switch-to-buffer' proceeds interactively when the
623 selected window is strongly dedicated to its buffer.
626 ** The option 'even-window-heights' has been renamed to
627 'even-window-sizes' and now handles window widths as well.
630 ** terpri gets an optional arg ENSURE to conditionally output a newline.
633 ** 'insert-register' now leaves point after the inserted text
634 when called interactively. A prefix argument toggles this behavior.
637 ** The new variable 'term-file-aliases' replaces some files from lisp/term.
638 The function 'tty-run-terminal-initialization' consults this variable
639 when deciding what terminal-specific initialization code to run.
642 ** New variable 'system-configuration-features', listing some of the
643 main features that Emacs was compiled with. This is mainly intended
644 for use in Emacs bug reports.
647 ** A password is now hidden also when typed in batch mode. Another
648 hiding character but the default '.' can be used by let-binding the
649 variable 'read-hide-char'.
652 ** The Emacs pseudo-random number generator can be securely seeded.
653 On system where Emacs can access the system entropy or some other
654 cryptographically secure random stream, it now uses that when 'random'
655 is called with its argument 't'. This allows cryptographically strong
656 random values; in particular, the Emacs server now uses this facility
657 to produce its authentication key.
660 ** New input methods: 'tamil-dvorak' and 'programmer-dvorak'.
663 * Editing Changes in Emacs 25.1
666 ** M-x suggests shorthands and ignores obsolete commands for completion.
671 *** Successive single-char deletions are collapsed in the undo-log just like
672 successive char insertions. Which commands invoke this behavior is
673 controlled by the new 'undo-auto-amalgamate' function. See the node
674 "Undo" in the ELisp manual for more details.
677 *** The heuristic used to insert 'undo-boundary' after each command
678 has changed, so that if a command causes changes in more than just the
679 current buffer, Emacs now calls 'undo-boundary' in every buffer
680 affected by the command.
683 ** New command 'comment-line' bound to 'C-x C-;'.
685 ** New and improved facilities for inserting Unicode characters
688 *** Unicode names entered via C-x 8 RET now use substring completion by default.
691 *** C-x 8 now has shorthands for several chars, such as U+2010
692 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH). As
693 before, you can type C-x 8 C-h to list shorthands.
696 *** New minor mode electric-quote-mode for using curved quotes as you
697 type. See also the new variable 'text-quoting-style'.
700 ** New minor mode global-eldoc-mode is enabled by default.
703 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
704 Bracketed paste mode causes text terminals to wrap pasted text in special
705 escape sequences that allow Emacs to tell the difference between text
706 you type and text you paste from other applications. Emacs then
707 avoids interpreting each character in the pasted text as it does with
708 keyboard input, which results in a paste experience similar to that
709 under a window system, and significant performance improvements when
710 pasting large amounts of text.
712 Bracketed paste mode is disabled by default, so Emacs automatically
713 enables it at startup if the terminal supports it.
716 ** Emacs now supports the latest version of the UBA.
717 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
718 was updated to support all the latest additions and changes introduced
719 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
720 This includes full support for directional isolates and the
721 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
725 ** You can access 'mouse-buffer-menu' (C-down-mouse-1) using C-f10.
728 ** New buffer-local 'electric-pair-local-mode'.
731 ** New variable 'fast-but-imprecise-scrolling' inhibits
732 fontification during full screen scrolling operations, giving less
733 hesitant operation during auto-repeat of C-v, M-v at the cost of
734 possible inaccuracies in the end position.
737 ** New documentation command 'describe-symbol'.
738 Works for functions, variables, faces, etc. It is bound to 'C-h o' by
742 ** New function 'custom-prompt-customize-unsaved-options' checks for
743 unsaved customizations and prompts user to customize (if found). It
744 is intended for adding to 'kill-emacs-query-functions'.
747 ** The old 'C-x w' bindings in hi-lock-mode are officially deprecated
748 in favor of the global 'M-s h' bindings introduced in Emacs-23.1.
749 They'll disappear soon.
752 * Changes in Specialized Modes and Packages in Emacs 25.1
757 *** New command 'checkdoc-package-keywords' checks if the
758 current package keywords are recognized. Set the new option
759 'checkdoc-package-keywords-flag' to non-nil to make
760 'checkdoc-current-buffer' call this function automatically.
763 *** New function 'checkdoc-file' checks for style errors.
764 It's meant for use together with 'compile':
765 emacs -batch --eval "(checkdoc-file \"subr.el\")"
770 *** The desktop format version has been upgraded from 206 to 208.
771 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
772 cannot read a version 208 desktop. To upgrade your desktop file, you
773 must explicitly request the upgrade, by C-u M-x desktop-save. You are
774 recommended to do this as soon as you have firmly upgraded to Emacs
775 25.1 (or later). Should you ever need to downgrade your desktop file
776 to version 206, you can do this with C-u C-u M-x desktop-save.
779 ** New function 'bookmark-set-no-overwrite' bound to C-x r M.
780 It raises an error if a bookmark of that name already exists,
781 unlike 'bookmark-set' which silently updates an existing bookmark.
786 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
787 now control how mm-* functions fetch and display images in an HTML
788 message. Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
789 for that purpose, i.e., binds mm-html- variables with those gnus-
790 variables, but other packages do not have to bind gnus- variables now.
793 *** 'mm-inline-text-html-with-images' has been removed.
794 Use 'mm-html-inhibit-images' instead. Note that the value is opposite
800 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
801 GnuTLS encryption functions if possible.
806 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
807 the ordering of object keys by default.
810 *** New commands 'json-pretty-print-ordered' and
811 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
812 object keys sorted alphabetically.
814 ** Prettify Symbols mode
817 *** Prettify Symbols mode supports custom composition predicates. By
818 overriding the default 'prettify-symbols-compose-predicate', modes can
819 specify in which contexts a symbol may be displayed as some Unicode
820 character. 'prettify-symbols-default-compose-p' is the default which
821 is suitable for most programming languages such as C or Lisp (but not
825 *** Symbols can be unprettified while point is inside them.
826 New variable 'prettify-symbols-unprettify-at-point' configures this.
828 ** Enhanced xterm support
831 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
832 This variable tells Emacs which advanced capabilities are available in
833 the xterm terminal emulator used to display Emacs text-mode frames.
834 The default is to check each capability, and use it if available.
835 (This variable was introduced in Emacs 24.1, but was not announced in
839 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
840 in the surrounding GUI (using the OSC-52 escape sequence). This only works
841 if your xterm supports it and enables the 'allowWindowOps' options (disabled
842 by default at least in Debian, for security reasons).
844 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
845 escape sequence) if your xterm has the feature enabled but for that you
846 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
849 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
852 ** The way to turn on and off 'save-place' mode has changed.
853 It is no longer sufficient to load the saveplace library and set
854 'save-place' non-nil. Instead, use the two new minor modes:
855 'save-place-mode' turns on saving last place in every file, and
856 'save-place-local-mode' does that only for the file in whose buffer it
857 is invoked. The 'save-place' variable is now an obsolete alias for
858 'save-place-mode', which replaces it, and 'toggle-save-place' is an
859 obsolete alias for the new 'save-place-local-mode' command.
864 *** ERC can now hide message types by network or channel.
865 'erc-hide-list' will hide all messages of the specified type, while
866 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
867 specified message types for the respective specified targets.
870 *** Reconnection is now asynchronous.
873 *** Nick completion is now case-insensitive again after inadvertently
874 being made case-sensitive in Emacs 24.2.
879 *** New commands, key binds, and menu items.
881 **** '<' and '>' for navigating previous and next tracks in playlist
883 **** New play/pause command 'mpc-toggle-play' bound to 's'
885 **** 'g' bound to new command 'mpc-seek-current' will navigate current
888 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
889 toggling playback modes.
892 *** Now supports connecting to a UNIX domain socket.
895 *** Looks at more image file names to use as album art.
896 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
897 (XP) in addition to cover.jpg.
900 *** Searches in more locations for MPD configuration files.
901 MPD supports the XDG base directory specification since version 0.17.6.
906 *** 'midnight-mode' is now a proper minor mode.
909 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
914 *** New "external" package status.
915 An external package is any installed package that's not built-in and
916 not from 'package-user-dir', which usually means it's from an entry in
917 'package-directory-list'. They are treated much like built-in
918 packages, in that they cannot be deleted through the package menu and
919 are not considered for upgrades.
921 The effect is that a user can manually place a specific version of a
922 package inside 'package-directory-list' and the package menu will
926 *** If a package is available on multiple archives and one has higher
927 priority (as per 'package-archive-priorities') only that one is
928 listed. This can be configured with 'package-menu-hide-low-priority'.
931 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
932 This includes the above-mentioned low-priority packages, as well as
933 available packages whose version is lower than the currently installed
934 version (which were previously impossible to display).
935 This allows users to downgrade a package if a lower version is
939 *** When filtering the package menu, keywords starting with "arc:" or
940 "status:" represent package archive or status, respectively, instead
944 *** Most functions which involve downloading information now take an
945 ASYNC argument. If it is non-nil, package.el performs the download(s)
949 *** New variable 'package-menu-async' controls whether the
950 package-menu uses asynchronous downloads.
953 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
954 This follows the same rules as installing from a .tar file, except the
955 -pkg file is optional.
958 *** Packages which are dependencies of other packages cannot be deleted.
959 The FORCE argument to 'package-delete' overrides this.
962 *** New custom variable 'package-selected-packages' tracks packages
963 which were installed by the user (as opposed to installed as
964 dependencies). This variable can also be manually customized.
967 *** New command 'package-install-selected-packages' installs all
968 packages from 'package-selected-packages' which are currently missing.
971 *** 'package-install' function now takes a DONT-SELECT argument. If
972 this function is called interactively or if DONT-SELECT is nil, add the
973 package being installed to 'package-selected-packages'.
976 *** New command 'package-autoremove' removes all packages which were
977 installed strictly as dependencies but are no longer needed.
982 When you invoke 'shell' interactively, the *shell* buffer will now
983 display in a new window. However, you can customize this behavior via
984 the 'display-buffer-alist' variable. For example, to get
985 the old behavior -- *shell* buffer displays in current window -- use
986 (add-to-list 'display-buffer-alist
987 '("^\\*shell\\*$" . (display-buffer-same-window))).
991 *** The ':protection' slot option is not obeyed any more.
993 *** The 'newname' argument to constructors is optional&deprecated.
994 If you need your objects to be named, do it by inheriting from 'eieio-named'.
996 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
998 *** The <class> variables are declared obsolete.
1000 *** The <initarg> variables are declared obsolete.
1002 *** defgeneric and defmethod are declared obsolete.
1003 Use the equivalent facilities from cl-generic.el instead.
1005 *** 'constructor' is now an obsolete alias for 'make-instance'.
1006 --- 'pcase' accepts a new UPattern 'eieio'.
1011 *** New command 'ido-bury-buffer-at-head' bound to C-S-b
1012 Bury the buffer at the head of 'ido-matches', analogous to how C-k
1013 kills the buffer at head.
1016 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
1017 meaning, and the list is restricted to those elements that do not
1018 match the current input.
1023 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
1024 The new commands 'next-line-or-history-element' and
1025 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
1026 minibuffer, allow by-line movement through minibuffer history,
1027 similarly to an ordinary buffer. Only when point moves over
1028 the bottom/top of the minibuffer it goes to the next/previous history
1029 element. 'M-p' and 'M-n' still move directly to previous/next history
1032 ** Search and Replace
1035 *** 'isearch' and 'query-replace' can now perform character folding in matches.
1036 This is analogous to case folding, but instead of disregarding case
1037 variants, it disregards wider classes of distinctions between similar
1038 characters. (Case folding is a special case of character folding.)
1039 This means many characters in the search string will match entire
1040 groups of characters instead of just themselves.
1042 For instance, the ASCII double quote character " will match all
1043 variants of double quotes, and the letter 'a' will match all of its
1044 accented cousins, even those composed of multiple characters, as well
1045 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
1048 Character folding is enabled by customizing 'search-default-mode' to
1049 the value 'character-fold-to-regexp'. You can also toggle character
1050 folding in the middle of a search by typing 'M-s ''.
1052 'query-replace' honors character folding if the new variable
1053 'replace-character-fold' is customized to a non-nil value.
1056 *** New user option 'search-default-mode'.
1057 This option specifies the default mode for Isearch. The default
1058 value, nil specifies that Isearch does literal searches (however,
1059 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
1060 as in previous Emacs versions).
1063 *** New function 'character-fold-to-regexp' can be used
1064 by searching commands to produce a regexp matching anything that
1065 character-folds into STRING.
1068 *** The new M-s M-w key binding uses eww to search the web for the
1069 text in the region. The search engine to use for this is specified by
1070 the customizable variable 'eww-search-prefix'.
1073 *** Query-replace history is enhanced.
1074 When query-replace reads the FROM string from the minibuffer, typing
1075 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
1076 and TO are the original text and its replacement, and SEP is an arrow
1077 string defined by the new variable 'query-replace-from-to-separator'.
1078 To select a prior replacement, type 'M-p' until the desired
1079 replacement appears in the minibuffer, and then exit the minibuffer by
1084 *** If 'quick-calc' is called with a prefix argument, insert the
1085 result of the calculation into the current buffer.
1088 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
1089 this you can tell Edebug not to stop at the start of the first
1090 instrumented function.
1095 *** New minor mode 'global-eldoc-mode'
1096 It is turned on by default, and affects '*scratch*' and other buffers
1097 whose major mode supports Emacs Lisp.
1100 *** 'eldoc-documentation-function' now defaults to 'ignore'
1103 *** 'describe-char-eldoc' displays information about character at point,
1104 and can be used as a default value of 'eldoc-documentation-function'. It is
1105 useful when, for example, one needs to distinguish various spaces - e.g.,
1106 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
1107 using mono-spaced font.
1112 *** HTML can now be rendered using variable-width fonts.
1115 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
1116 whether to use variable-pitch fonts or not. The user can also
1117 customize the 'shr-use-fonts' variable.
1120 *** A new command 'R' ('eww-readable') will try do identify the main
1121 textual parts of a web page and display only that, leaving menus and
1122 the like off the page.
1125 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
1126 toggle the paragraph direction between left-to-right and right-to-left.
1129 *** You can now use several eww buffers in parallel by renaming eww
1130 buffers you want to keep separate.
1133 *** Partial state of the eww buffers (the URIs and the titles of the
1134 pages visited) is now preserved in the desktop file.
1137 *** 'eww-after-render-hook' is now called after eww has rendered
1138 the data in the buffer.
1141 *** The 'eww-reload' command now takes a prefix to not reload via
1142 the net, but just use the local copy of the HTML.
1145 *** The DOM shr and eww uses has been changed to the general Emacs
1146 xml.el/libxml2 DOM, and a new package dom.el has been added to
1147 interact with this DOM. See the Emacs Lisp manual for interface
1151 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
1154 *** The new 'S' command will list all eww buffers, and allow managing
1158 *** https pages with valid certificates have headers marked in green, while
1159 invalid certificates are marked in red.
1164 *** text/html messages that contain inline image parts will be
1165 transformed into multipart/related messages before sending.
1168 ** In Show Paren Mode, a parenthesis can be highlighted when point
1169 stands inside it, and certain parens can be highlighted when point is
1170 at BOL or EOL, or in whitespace there. To enable these, customize,
1171 respectively, 'show-paren-when-point-inside-paren' or
1172 'show-paren-when-point-in-periphery'.
1175 ** If gpg2 exists on the system, it is now used as the default value
1176 of 'epg-gpg-program' (instead of gpg).
1181 *** Strings after ':documentation' are highlighted as docstrings.
1182 This enhances Lisp mode fontification to handle documentation of the
1183 form '(:documentation "the doc string")' used in Common Lisp code for
1184 CLOS class and slot documentation.
1186 ** Rectangle editing
1189 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
1192 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
1193 *** 'string-rectangle' provides on-the-fly preview of the result.
1196 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
1197 These should be used in preference to 'font-lock-fontify-buffer' when
1201 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
1202 to 'minibuffer-setup-hook'.
1204 If the first argument of the macro is of the form '(:append FUN)',
1205 then FUN will be appended to 'minibuffer-setup-hook', instead of
1210 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
1213 *** 'pcase' accepts the new UPattern 'cl-struct'.
1215 ** Calendar and diary
1218 *** The default 'diary-file' is now located in .emacs.d.
1221 *** New commands to insert diary entries with Chinese dates:
1222 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
1223 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
1226 *** The calendar can now list and mark diary entries with Chinese dates.
1227 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
1230 *** The option 'calendar-mode-line-format' can now be nil,
1231 which means to do nothing special with the mode line in calendars.
1234 *** New option 'calendar-weekend-days'.
1235 The option customizes which day headers receive the
1236 'calendar-weekend-header' face.
1239 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
1242 *** Many items obsolete since at least version 23.1 have been removed.
1243 The majority were function/variable/face aliases, too numerous to list here.
1246 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
1247 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
1249 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
1251 **** Macro 'calendar-for-loop'.
1253 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
1255 **** The nil and list forms of 'diary-display-function'.
1258 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
1259 If the output of ERT tests in batch mode execution can be saved to a
1260 log file, then it can be passed as an argument to the above function
1261 to produce a neat summary.
1264 ** New js.el option 'js-indent-first-init'.
1269 ** Info mode now displays symbol names in fixed-pitch font.
1270 If you want to get the old behavior back, customize the 'Info-quoted'
1271 face to use the same definitions as the default face.
1274 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
1277 *** 'info-display-manual' can now be given a prefix argument which (any
1278 non-nil value) directs the command to limit the completion
1279 alternatives to currently visited manuals.
1282 ** ntlm.el has support for NTLM2.
1287 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
1288 to delete or undelete multiple messages.
1291 *** Rmail can now render HTML mail messages if your Emacs was built with
1292 libxml2 or if you have the Lynx browser installed. By default, Rmail
1293 will display the HTML version of a mail message that has both HTML and
1294 plain text parts, if display of HTML email is possible; customize the
1295 'rmail-mime-prefer-html' option to 'nil' if you don't want that.
1298 *** In the commands that make summaries by subject, recipients, or senders,
1299 you can no longer use commas to separate regular expressions.
1302 ** SES now supports local printer functions; see 'ses-define-local-printer'.
1304 ** Shell-script Mode
1306 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
1307 specify the type of shell in use (bash, csh, etc).
1310 *** New value 'always' for 'sh-indent-after-continuation'.
1311 This provides old-style ("dumb") indentation of continued lines.
1312 See the doc string of 'sh-indent-after-continuation' for details.
1316 *** Fatal TLS errors are now silent by default.
1319 *** If Emacs isn't built with TLS support, an external TLS-capable
1320 program is used instead. This program used to be run in --insecure
1321 mode by default, but has now changed to be secure instead, and will
1322 fail if you try to connect to non-verifiable hosts. This is
1323 controlled by the 'tls-program' variable.
1328 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1329 When 'url-handler-mode' is enabled, file operations for these
1330 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1333 *** The URL package allows customizing the 'url-user-agent' string.
1334 The new 'url-user-agent' variable can be customized to be a string or
1338 *** The new interface variable 'url-request-noninteractive' can be used
1339 to specify that we're running in a noninteractive context, and that
1340 we should not be queried about things like TLS certificate validity.
1343 *** 'url-mime-accept-string' can now be used as in "interface"
1344 variable, meaning you can bind it around an 'url-retrieve' call.
1347 *** If URL is used with a https connection, the first callback argument
1348 plist will contain a :peer element that has the output of
1349 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
1354 *** New connection method "afp", which allows you to access Mac OS X
1355 volumes via the Apple Filing Protocol.
1358 *** New connection method "nc", which allows you to access dumb
1362 *** Method-specific parameters can be overwritten now with variable
1363 'tramp-connection-properties'.
1366 *** Handler for 'file-notify-valid-p' for remote machines that support
1367 filesystem notifications.
1372 *** New user variable 'sql-default-directory' enables remote
1373 connections using Tramp.
1376 *** New command 'sql-send-line-and-next'.
1377 This command, bound to 'C-c C-n' by default, sends the current line to
1378 the SQL process and advances to the next line, skipping whitespace and
1382 *** Added support for Vertica SQL.
1384 ** VC and related modes
1387 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
1388 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1389 (undocumented) command vc-hg-push now behaves slightly differently.
1392 *** The new command vc-region-history shows the log+diff of the active region.
1395 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
1396 This command is useful when you perform version control commands
1397 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1398 back-end for the buffer's file, or remove it from version control.
1401 *** New option 'vc-annotate-background-mode' controls whether
1402 the color range from 'vc-annotate-color-map' is applied to the
1403 background or to the foreground.
1406 *** New options for customizing encoding of Git commit log messages.
1407 The new user options 'vc-git-commits-coding-system' and
1408 'vc-git-log-output-coding-system' specify the encoding of log messages
1409 sent to Git when committing, and the decoding of log messages read
1410 from Git history commands. These options default to UTF-8; if
1411 customized, they should be consistent with the Git config variables
1412 i18n.commitEncoding and i18n.logOutputEncoding.
1413 ('vc-git-commits-coding-system' existed previously, but was a
1414 variable, not a user option.)
1417 *** 'compare-windows' now compares text with the most recently selected window
1418 instead of the next window. If you want the previous behavior of
1419 comparing with the next window, customize the new option
1420 'compare-windows-get-window-function' to the value
1421 'compare-windows-get-next-window'.
1424 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
1425 replace the face 'compare-windows', which is now an obsolete alias for
1426 'compare-windows-added'.
1429 *** The VC state indicator in the mode line now has different faces
1430 corresponding to each of the possible states. See the 'vc-faces'
1431 customization group.
1434 *** 'log-edit-insert-changelog' converts "(tiny change)" to
1435 "Copyright-paperwork-exempt: yes". Set 'log-edit-rewrite-tiny-change'
1436 nil to disable this.
1439 *** vc-mcvs.el has been removed.
1442 ** VHDL mode now supports VHDL'08.
1447 *** Decimal display mode uses "," groups, so it's more
1448 fitting for use in money calculations
1451 *** Factorial works with non-integer inputs.
1456 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1457 macro argument expansion, interactive macro evaluation and automatic
1458 scanning of #define'd symbols.
1461 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
1462 result of evaluating a macro.
1465 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
1466 all defined symbols in 'hide-ifdef-env'.
1469 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
1470 file name patterns. Defaults to files whose extension is one of '.h',
1471 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
1474 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
1475 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1476 (This could happen when an idempotent header file is visited again,
1477 when its guard symbol is already defined.) Defaults to 't'.
1480 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
1481 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1482 looking for macro definitions. By default, no symbols are ignored.
1487 *** New custom variable 'tex-print-file-extension' to help users who
1488 use PDF instead of DVI.
1491 *** TeX mode now supports Prettify Symbols mode. When enabling
1492 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1493 many other math macros are displayed using unicode characters.
1496 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
1497 By default, 32 consecutive spaces or four consecutive TABs are
1498 considered to be too deep, but the new variable
1499 'whitespace-big-indent-regexp' can be customized to change that.
1502 ** New options in 'tildify-mode'.
1503 New options 'tildify-space-string', 'tildify-pattern', and
1504 'tildify-foreach-region-function' variables make
1505 'tildify-string-alist', 'tildify-pattern-alist', and
1506 'tildify-ignored-environments-alist' variables (as well as a few
1507 helper functions) obsolete.
1510 ** New package Xref replaces Etags's front-end and UI
1512 The new package Xref provides a generic framework and new commands to
1513 find and move to definitions of functions, macros, data structures
1514 etc., as well as go back to the location where you were before moving
1515 to a definition. It supersedes and obsoletes many Etags commands,
1516 while still using the etags.el code that reads the TAGS tables as one
1519 The command 'xref-find-definitions' replaces 'find-tag' and provides
1520 an interface to pick one definition among several.
1521 'tags-loop-continue' is now unbound. 'xref-pop-marker-stack' replaces
1522 'pop-tag-mark', but has a keybinding ('M-,') different from the one
1523 'pop-tag-mark' used.
1525 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
1526 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
1527 'xref-find-apropos' replaces 'find-tag-regexp'.
1529 As a result of this, the following commands are now obsolete:
1530 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
1533 'tags-loop-continue' is not obsolete because it's still useful in
1534 'tags-search' and 'tags-query-replace', for which there are no direct
1538 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
1539 replaced by xref-style commands, see the "Dired" section below.
1544 'find-tag-marker-ring-length' is now an obsolete alias for
1545 'xref-marker-ring-length'. 'find-tag-marker-ring' is now an obsolete
1546 alias for a private variable. 'xref-push-marker-stack' and
1547 'xref-pop-marker-stack' should be used instead to manipulate the stack
1548 of searches for definitions.
1551 *** 'xref-find-definitions' and 'describe-function' now display
1552 information about mode local overrides (defined by cedet/mode-local.el
1553 'define-overloadable-function' 'define-mode-local-overrides').
1555 The framework's Lisp API is still experimental and can change in major,
1556 backward-incompatible ways.
1559 ** New package Project
1561 The new package Project provides generic infrastructure for dealing
1562 with projects. The main commands included in it are
1563 'project-find-file' and 'project-find-regexp'.
1565 The Lisp API of this package is still experimental.
1568 EUDC's LDAP backend has been improved.
1571 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1574 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1575 subprocess instead of on the command line.
1578 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1579 need to configure this manually anymore.
1582 *** The LDAP configuration section of EUDC's manual has been
1585 There have also been customization changes.
1588 *** New custom variable 'eudc-server-hotlist' to allow specifying
1589 multiple EUDC servers in init file.
1592 *** Custom variable 'eudc-inline-query-format' defaults to completing
1593 on email and firstname instead of surname.
1596 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
1597 to avoid interfering with the kill ring.
1600 *** Custom variable 'eudc-inline-expansion-format' defaults to
1601 "Firstname Surname <mail-address>".
1604 *** Custom variable 'eudc-options-file' defaults to
1605 "~/.emacs.d/eudc-options".
1608 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
1609 allow overriding the regular expression that recognizes the ldapsearch
1610 command line's password prompt.
1613 EUDC's BBDB backend now supports BBDB 3.
1616 EUDC's PH backend (eudcb-ph.el) is obsolete.
1621 *** The new built-in command 'clear' can scroll window contents out of sight.
1622 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1625 *** New buffer syntax '#<buffer-name>', which is equivalent to
1626 '#<buffer buffer-name>'. This shorthand makes interacting with
1627 buffers from eshell more convenient. Custom variable
1628 'eshell-buffer-shorthand', which has been broken for a while, has been
1632 *** By default, eshell "visual" program buffers (created by
1633 'eshell-visual-commands' and similar custom vars) are no longer killed
1634 when their processes die. This fixes issues with short-lived commands
1635 and makes visual programs more useful in general. For example, if
1636 "git log" is a visual command, it will always show the visual command
1637 buffer, even if the "git log" process dies. For the old behavior,
1638 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
1643 *** Support for the Google Chrome web browser.
1646 *** Support for the Conkeror web browser.
1649 *** Support for several ancient browsers is now officially obsolete.
1652 ** tar-mode: new 'tar-new-entry' command, allowing for new members to
1653 be added to the archive.
1658 *** Dired buffers are also auto-reverted via file notifications, if
1659 Emacs is compiled with file notification support.
1662 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
1663 See <http://debbugs.gnu.org/22814>.
1665 ** File Notifications
1668 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1671 *** The new event 'stopped' signals, that a file notification watch is
1672 not active any longer.
1675 *** The new function 'file-notify-valid-p' checks, whether a file
1676 notification descriptor still corresponds to an activate watch.
1681 *** The command 'dired-do-compress' bound to 'Z' now can compress
1682 directories and decompress zip files.
1685 *** New command 'dired-do-compress-to' bound to 'c' can be used to
1686 compress many marked files into a single named archive. The
1687 compression command is determined from the new
1688 'dired-compress-files-alist' variable.
1691 *** New user interface for the 'A' and 'Q' commands.
1692 These keys, now bound to 'dired-do-find-regexp' and
1693 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
1694 and 'xref-query-replace-in-results': they present the matches
1695 in the '*xref*' buffer and let you move through the matches. No need
1696 to use 'tags-loop-continue' to resume the search or replace loop. The
1697 previous commands, 'dired-do-search' and
1698 'dired-do-query-replace-regexp', are still available, but not bound to
1699 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
1700 back. We intend to obsolete the old commands in a future release.
1702 ** Tabulated List Mode
1705 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
1706 call 'tabulated-list-init-header', in which case it will have no
1710 *** 'tabulated-list-print' takes a second optional argument, update,
1711 which specifies an alternative printing method which is faster when
1712 few or no entries have changed.
1714 ** Obsolete packages
1720 *** landmark.el (moved to elpa.gnu.org)
1723 * New Modes and Packages in Emacs 25.1
1726 ** pinentry.el allows GnuPG passphrase to be prompted through the
1727 minibuffer instead of a graphical dialog, depending on whether the gpg
1728 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1729 is set). This feature requires newer versions of GnuPG (2.1.5 or
1730 later) and Pinentry (0.9.5 or later). To use this feature, add
1731 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1732 configuration with "gpgconf --reload gpg-agent".
1735 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1736 The main entry points are 'cl-defgeneric' and 'cl-defmethod'. See the
1737 node "Generic Functions" in the Emacs Lisp manual for more details.
1740 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1741 SCSS (Sassy CSS) files.
1744 ** let-alist is a new macro (and a package) that allows one to easily
1745 let-bind the values stored in an alist.
1748 ** 'tildify-mode' allows automatic insertion of hard spaces as one
1749 types the text. Breaking line after a single-character words is
1750 forbidden by Czech and Polish typography (and may be discouraged in
1751 other languages), so 'auto-tildify-mode' makes it easier to create
1752 a typographically-correct documents.
1755 ** The 'seq' library adds sequence manipulation functions and macros
1756 that complement basic functions provided by subr.el. All functions
1757 are prefixed with 'seq-' and work on lists, strings and vectors.
1758 'pcase' accepts a new Upattern 'seq'.
1761 ** The 'map' library provides map-manipulation functions that work on
1762 alists, hash-table and arrays. All functions are prefixed with
1763 'map-'. 'pcase' accepts a new UPattern 'map'.
1766 ** The 'thunk' library provides functions and macros to control the
1767 evaluation of forms.
1770 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1771 support for JSX, an XML-like syntax extension to ECMAScript.
1774 * Incompatible Lisp Changes in Emacs 25.1
1777 ** 'setq' and 'setf' must now be called with an even number of
1778 arguments. The earlier behavior of silently supplying a nil to the
1779 last variable when there was an odd number of arguments has been
1783 ** 'syntax-begin-function' is declared obsolete.
1784 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1785 slot in font-lock-defaults.
1788 ** The new implementation of Subword mode affects word movement everywhere.
1789 When Subword mode is turned on, 'forward-word', 'backward-word', and
1790 everything that uses them will move by sub-words, effectively
1791 overriding the buffer's syntax table. Lisp programs that shouldn't be
1792 affected by Subword mode should call the new functions
1793 'forward-word-strictly' and 'backward-word-strictly' instead.
1796 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
1797 called during startup. Users who call this function in their init
1798 file and still expect it to be run after startup should set
1799 'package-enable-at-startup' to t after the call to
1800 'package-initialize'.
1803 ** ':global' minor mode use 'setq-default' rather than 'setq'.
1804 This means that you can't use 'make-local-variable' and expect them to
1805 "magically" become buffer-local.
1808 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
1809 The 'track-mouse' form no longer refrains from changing the shape of
1810 the mouse pointer for the entire time the body of that form is
1811 executed. Lisp programs that use 'track-mouse' for dragging across
1812 large portions of the Emacs display, and want to avoid changes in the
1813 pointer shape during dragging, should bind the variable 'track-mouse'
1814 to the special value 'dragging' in the body of the form.
1817 ** The optional 'predicate' argument of 'lisp-complete-symbol' no longer
1818 has any effect. (This change was made in Emacs 24.4 but was not
1819 advertised at the time.)
1822 ** 'indirect-function' does not signal 'void-function' any more.
1823 This is mostly a bug-fix, since this change was missed back in 24.4 when
1824 symbol-function was changed not to signal 'void-function' any more.
1827 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
1830 ** M-x shell and M-x compile no longer set the EMACS environment variable.
1831 This avoids clashing when other programs use the variable for other purposes.
1832 Although M-x term still sets EMACS for compatibility with Bash 4.3 and earlier,
1833 this is deprecated and will be phased out when Bash 4.4 or later takes over.
1834 Use the INSIDE_EMACS environment variable instead.
1837 ** 'save-excursion' does not save&restore the mark any more.
1838 Use 'save-mark-and-excursion' if you want the old behavior.
1841 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
1842 argument ('predicate').
1845 ** 'completion-table-dynamic' by default stays in the minibuffer.
1846 The minibuffer will be the current buffer when the function is called.
1847 If you want the old behavior of calling the function in the buffer
1848 from which the minibuffer was entered, use the new argument
1849 'switch-buffer' to 'completion-table-dynamic'.
1852 ** window-configurations no longer record the buffers' marks.
1855 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1856 active region handling.
1859 ** deactivate-mark is now buffer-local.
1862 ** 'cl-the' now asserts that its argument is of the given type.
1865 ** 'process-running-child-p' may now return a numeric process
1866 group ID instead of 't'.
1869 ** Mouse click events on mode line or header line no longer include
1870 any reference to a buffer position. The 6th member of the mouse
1871 position list returned for such events is now nil.
1874 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1875 These slots used to hold key-shortcut data, but have been obsolete since
1879 ** Emacs no longer downcases the first letter of a system diagnostic
1880 when signaling a file error. For example, it now reports "Permission
1881 denied" instead of "permission denied". The old behavior was problematic
1882 in languages like German where downcasing rules depend on grammar.
1885 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
1886 Set it to 'curve' for curved single quotes, to 'straight' for straight
1887 apostrophes, and to 'grave' for grave accent and apostrophe. The
1888 default value nil acts like 'curve' if curved single quotes are
1889 displayable, and like 'grave' otherwise. The new variable affects
1890 display of diagnostics and help, but not of info.
1893 ** substitute-command-keys now replaces quotes.
1894 That is, it converts documentation strings' quoting style as per the
1895 value of 'text-quoting-style'. Doc strings in source code can use
1896 either curved single quotes or grave accents and apostrophes. As
1897 before, characters preceded by \= are output as-is.
1900 ** Message-issuing functions 'error', 'message', etc. now convert quotes.
1901 They use the new 'format-message' function instead of plain 'format',
1902 so that they now follow user preference as per 'text-quoting-style'
1903 when processing curved single quotes, grave accents, and apostrophes
1904 in their format argument.
1907 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1908 now match multibyte characters using Unicode character properties.
1909 If you want the old behavior where they matched any character with
1910 word syntax, use '\sw' instead.
1913 ** The character classes [:graph:] and [:print:] in regular expressions
1914 no longer match every multibyte character. Instead, Emacs now
1915 consults the Unicode character properties to determine which
1916 characters are graphic or printable. In particular, surrogates and
1917 unassigned codepoints are now rejected. If you want the old behavior,
1918 use [:multibyte:] instead.
1921 ** The 'diff' command uses the unified format now. To restore the old
1922 behavior, set 'diff-switches' to '-c'.
1925 ** 'grep-template' and 'grep-find-template' values don't include the
1926 --color argument anymore. It's added at the <C> place holder position
1927 dynamically. Any third-party code that changes these templates should
1928 be updated accordingly.
1931 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
1932 The new behavior is compatible with Common Lisp and with XEmacs.
1933 This change does not affect Lisp code intended to be portable to
1934 Emacs 24.2 and earlier, which did not support unary '/'.
1937 ** The 'default-directory' value doesn't have to end slash. To make
1938 that happen, 'unhandled-file-name-directory' now defaults to calling
1939 'file-name-as-directory'.
1942 * Lisp Changes in Emacs 25.1
1946 *** New UPatterns 'quote', 'app'.
1948 *** New UPatterns can be defined with 'pcase-defmacro'.
1950 *** New vector QPattern.
1953 ** syntax-propertize is now automatically called on-demand during forward
1954 parsing functions like 'forward-sexp'.
1957 ** New hooks 'prefix-command-echo-keystrokes-functions' and
1958 'prefix-command-preserve-state-hook' allow the definition of prefix
1959 commands other than the predefined 'C-u'.
1962 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
1963 These allow conversion between buffer positions and the corresponding
1964 file byte offsets, given the file's encoding.
1967 ** The default value of 'load-read-function' is now 'read'.
1968 Previously, the default value of 'nil' implied using 'read'.
1971 ** New hook 'pre-redisplay-functions'.
1972 It is a bit easier to use than 'pre-redisplay-function'.
1975 ** The second arg of 'looking-back' should always be provided explicitly.
1976 Previously, it was an optional argument, now it's mandatory.
1979 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
1980 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
1981 implemented by the new 'cursor-intangible-mode' and
1982 'cursor-sensor-mode' minor modes.
1985 ** 'inhibit-point-motion-hooks' now defaults to 't' and is obsolete.
1986 Use the new minor modes 'cursor-intangible-mode' and
1987 'cursor-sensor-mode' instead.
1990 ** New process type 'pipe', which can be used in combination with the
1991 ':stderr' keyword of make-process to handle standard error output
1995 ** New function 'make-process' provides an alternative interface to
1996 'start-process'. It allows programs to set process parameters such as
1997 process filter, sentinel, etc., through keyword arguments (similar to
1998 'make-network-process').
2001 ** A new function 'directory-files-recursively' returns all matching
2002 files (recursively) under a directory.
2005 ** New variable 'inhibit-message', when bound to non-nil, inhibits
2006 'message' and related functions from displaying messages in the echo
2007 area. The output is still logged to the *Messages* buffer.
2010 ** A new text property 'inhibit-read-only' can be used in read-only
2011 buffers to allow certain parts of the text to be writable.
2014 ** A new variable 'comment-end-can-be-escaped' is useful in languages
2015 such as C and C++ where line comments with escaped newlines are
2016 continued to the next line.
2019 ** New macro 'define-advice'.
2022 ** Emacs Lisp now supports generators.
2023 See the "Generators" section of the ELisp manual for the details.
2026 ** New finalizer facility for running code when objects become unreachable.
2027 See the "Finalizer Type" subsection in the ELisp manual for the
2031 ** lexical closures can use (:documentation FORM) to build their docstring.
2032 It should be placed right where the docstring would be, and FORM is then
2033 evaluated (and should return a string) when the closure is built.
2036 ** define-inline provides a new way to define inlinable functions.
2039 ** New function 'macroexpand-1' to perform a single step of macro expansion.
2042 ** Some "x-*" functions were obsoleted and/or renamed:
2043 *** x-select-text is renamed gui-select-text.
2044 *** x-selection-value is renamed gui-selection-value.
2045 *** x-get-selection is renamed gui-get-selection.
2046 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
2047 *** x-get-selection-value is renamed to gui-get-primary-selection.
2048 *** x-set-selection is renamed to gui-set-selection
2051 ** New function 'string-greaterp', which return the opposite result of
2055 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
2056 preserve the collation order as defined by the system's locale(1)
2057 environment. For the time being this is implemented for modern POSIX
2058 systems and for MS-Windows, for other systems they fall back to their
2059 counterparts 'string-lessp' and 'string-equal'.
2062 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
2063 The effect is that, on systems that use ls-lisp for Dired, the default
2064 sort order of the files in Dired is now different from what it was in
2065 previous versions of Emacs. In particular, the file names are sorted
2066 disregarding punctuation, accents, and diacritics, and letter case is
2067 ignored. For example, files whose name begin with a period will no
2068 longer appear near the beginning of the directory listing. If you
2069 want the old, locale-independent sorting, customize the new option
2070 'ls-lisp-use-string-collate' to the nil value.
2073 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
2074 if set to a non-nil value, causes the above 2 functions to ignore
2075 symbol and punctuation characters when collating strings. This
2076 emulates the behavior of modern Posix platforms when the locale's
2077 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
2078 MS-Windows doesn't support UTF-8 as codeset in its locales.
2081 ** New function 'alist-get', which is also a valid place (aka lvalue).
2084 ** New function 'funcall-interactively', which works like 'funcall'
2085 but makes 'called-interactively-p' treat the function as (you guessed it)
2086 called interactively.
2089 ** New function 'function-put' to use instead of 'put' for function properties.
2092 ** The new function 'bidi-find-overridden-directionality' allows you to
2093 find characters whose directionality was, perhaps maliciously,
2094 overridden by directional override control characters. Lisp programs
2095 can use this to detect potential phishing of URLs and other links that
2096 exploits bidirectional display reordering.
2099 ** The new function 'buffer-substring-with-bidi-context' allows you to
2100 copy a portion of a buffer into a different location while preserving
2101 the visual appearance both of the copied text and the text at
2102 destination, even when the copied text includes mixed bidirectional
2103 text and directional control characters.
2106 ** New properties that can be specified with 'declare':
2107 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
2108 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
2109 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
2113 ** New macro 'with-file-modes', for evaluating expressions with default file
2114 permissions set to temporary values (e.g., for creating private files).
2117 ** You can access the slots of structures using 'cl-struct-slot-value'.
2120 ** Function 'sort' can deal with vectors.
2123 ** Function 'system-name' now returns an updated value if the current
2124 system's name has changed or if the Emacs process has changed systems,
2125 and to avoid long waits it no longer consults DNS to canonicalize the
2126 name. The variable 'system-name' is now obsolete.
2129 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
2132 ** If 'pwd' is called with a prefix argument, insert the current default
2136 ** New functions return extended information about fonts and faces.
2139 *** The function 'font-info' now returns more details about a font.
2140 In particular, it now returns the average width of the font's
2141 characters, which can be used for geometry-related calculations.
2144 *** A new function 'default-font-width' returns the average width of a
2145 character in the current buffer's default font. If the default face
2146 is remapped (see 'face-remapping-alist'), the value for the remapped
2147 face is returned. This function complements the existing function
2148 'default-font-height'.
2151 *** New functions 'window-font-height' and 'window-font-width' return
2152 the height and average width of characters in a specified face and
2153 window. If FACE is remapped (see 'face-remapping-alist'), the
2154 function returns the information for the remapped face.
2157 *** A new function 'window-max-chars-per-line' returns the maximal
2158 number of characters that can be displayed on one line. If a face
2159 and/or window are provided, these values are used for the
2160 calculation. This function is different from 'window-body-width' in
2161 that it accounts for (i) continuation glyphs, (ii) the size of the
2162 font, and (iii) the specified window.
2165 ** New utilities in subr-x.el:
2166 *** New macros 'if-let' and 'when-let' allow defining bindings and to
2167 execute code depending whether all values are true.
2168 *** New macros 'thread-first' and 'thread-last' allow threading a form
2169 as the first or last argument of subsequent forms.
2172 ** Documentation strings now support quoting with curved single quotes
2173 in addition to the old style with grave accent and apostrophe. The
2174 new style looks better on today's displays. In the new Electric Quote
2175 mode, you can enter curved single quotes into documentation by typing
2176 grave accent and apostrophe. Outside Electric Quote mode, you can
2177 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
2178 works) by typing 'A-[' and 'A-]'. As described above under
2179 'text-quoting-style', the user can specify how to display doc string
2183 ** New function 'format-message' is like 'format' and also converts
2184 curved single quotes, grave accents and apostrophes as per
2185 'text-quoting-style'.
2188 ** show-help-function's arg is converted via substitute-command-keys
2189 before being passed to the function. Help strings, help-echo
2190 properties, etc. can therefore contain command key escapes and
2194 ** Time-related changes:
2196 *** Time conversion functions now accept an optional ZONE argument
2197 that specifies the time zone rules for conversion. ZONE is omitted or
2198 nil for Emacs local time, t for Universal Time, 'wall' for system wall
2199 clock time, or a string as in the TZ environment variable. The
2200 affected functions are 'current-time-string', 'current-time-zone',
2201 'decode-time', and 'format-time-string'. The function 'encode-time',
2202 which already accepted a simple time zone rule argument, has been
2203 extended to accept all the new forms.
2205 *** Incompatible change in the third argument of 'format-time-string'.
2206 Previously, any non-nil argument was interpreted as specifying Universal Time.
2207 This is no longer true; packages that want Universal Time should pass t
2208 as the third argument.
2210 *** Time-related functions now consistently accept numbers
2211 (representing seconds since the epoch) and nil (representing the
2212 current time) as well as the usual list-of-integer representation.
2213 Affected functions include 'current-time-string', 'current-time-zone',
2214 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
2215 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
2216 'time-to-days', and 'time-to-seconds'.
2218 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
2221 *** 'calendar-next-time-zone-transition', 'time-add', and
2222 'time-subtract' no longer return time values in the obsolete and
2223 undocumented integer-pair format. Instead, they return a list of two
2227 ** New function 'set-binary-mode' allows switching a standard stream
2228 of the Emacs process to binary I/O mode.
2231 ** The new function 'directory-name-p' can be used to check whether a file
2232 name (as returned from, for instance, 'file-name-all-completions') is
2233 a directory file name. It returns non-nil if the last character in
2234 the name is a directory separator character (forward slash on GNU and
2235 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2238 ** ASCII approximations to curved quotes are put in standard-display-table
2239 if the terminal cannot display curved quotes.
2242 ** Standard output and error streams now transliterate characters via
2243 standard-display-table, and encode output using locale-coding-system.
2244 To force a specific encoding, bind 'coding-system-for-write' to the
2245 coding-system of your choice when invoking functions like 'prin1' and
2249 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
2252 ** New possible value for 'system-type': 'nacl'.
2253 This is used by Google's Native Client (NaCl).
2255 ** Miscellaneous name change
2258 For consistency with the usual Emacs spelling, the Lisp variable
2259 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
2260 The old name should still work, as an obsolescent alias.
2262 ** Changes in Frame- and Window- Handling
2265 *** Emacs can now draw horizontal scroll bars on some platforms that
2266 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2267 Horizontal scroll bars are turned off by default.
2269 **** New function 'horizontal-scroll-bars-available-p' telling whether
2270 horizontal scroll bars are available on the underlying system.
2272 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
2273 bars on all existing and future frames.
2275 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
2276 scroll bars on the selected frame.
2278 **** New frame parameters 'horizontal-scroll-bars' and
2279 'scroll-bar-height' to set horizontal scroll bars and their height
2280 for individual frames and in 'default-frame-alist'.
2282 **** New functions 'frame-scroll-bar-height' and
2283 'window-scroll-bar-height' return the height of horizontal scroll
2284 bars on a specific frame or window.
2286 **** 'set-window-scroll-bars' now accepts five parameters where the last
2287 two specify height and type of the window's horizontal scroll bar.
2289 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
2292 **** New buffer-local variables 'horizontal-scroll-bar' and
2293 'scroll-bar-height'.
2296 *** New functions 'frame-geometry' and 'frame-edges' give access to a
2300 *** New functions 'mouse-absolute-pixel-position' and
2301 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
2305 *** The function 'window-edges' now accepts three additional arguments to
2306 retrieve body, absolute and pixel edges of the window.
2309 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
2310 'window-inside-absolute-pixel-edges' have been renamed to respectively
2311 'window-body-edges', 'window-body-pixel-edges' and
2312 'window-absolute-body-pixel-edges'. The old names are kept as aliases.
2315 *** New function 'window-absolute-pixel-position' to get the screen
2316 coordinates of a visible buffer position.
2319 *** The height of a frame's menu and tool bar are no longer counted in the
2320 frame's text height. This means that the text height stands only for
2321 the height of the frame's root window plus that of the echo area (if
2322 present). This was already the behavior for frames with external tool
2323 and menu bars (like in the Gtk builds) but has now been extended to all
2327 *** Frames now do not necessarily preserve the number of columns or lines
2328 they display when setting default font, menu bar, fringe width, or
2329 scroll bars. In particular, maximized and fullscreen frames are
2330 conceptually never resized if such settings change. For fullheight and
2331 fullwidth frames, the behavior may depend on the toolkit used.
2332 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
2333 setting default font, menu bar, fringe width, or scroll bars of a
2334 specific frame does not resize that frame in order to preserve the
2335 number of columns or lines it displays.
2338 *** New function 'window-preserve-size' allows you to preserve the size of
2339 a window without "fixing" it. It's supported by 'fit-window-to-buffer',
2340 'temp-buffer-resize-mode' and 'display-buffer'.
2343 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
2344 This displays the buffer in an existing frame other than the current
2345 frame, and allows the caller to specify a frame predicate to exclude
2349 *** New minor mode 'window-divider-mode' and options
2350 'window-divider-default-places', 'window-divider-default-bottom-width'
2351 and 'window-divider-default-right-width'.
2354 *** The window displaying the '*Completions*' buffer with minibuffer
2355 completion candidates is now shown at the bottom of the selected
2356 frame. The size of that window is always as large as required to
2357 display all the candidates, except when limited by the minimum size
2358 of the other windows on that frame; those other windows are resized
2359 to provide space for the '*Completions*' display. The Emacs manual
2360 describes how to customize 'display-buffer-alist' to get back the old
2361 behavior, see the node "Temporary Displays" there.
2364 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2365 Those features have been deprecated in Gtk+ for a long time.
2370 *** etags no longer qualifies class members by default.
2372 By default, 'etags' will not qualify class members for Perl and C-like
2373 object-oriented languages with their class names and namespaces, and
2374 will remove qualifications used explicitly in the code from the tag
2375 names it puts in TAGS files. This is so the etags.el back-end for
2376 'xref-find-definitions' is more accurate and produces less false
2379 Use --class-qualify (-Q) if you want the old default behavior of
2380 qualifying class members in C++, Java, Objective C, and Perl. Note
2381 that using -Q might make some class members become "unknown" to 'M-.'
2382 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
2383 qualified names by hand.
2386 *** New language Ruby
2388 Names of modules, classes, methods, functions, and constants are
2389 tagged. Overloaded operators are also tagged.
2393 Names of packages, functions, and types are tagged.
2396 *** Improved support for Lua
2398 Etags now tags functions even if the "function" keyword follows some
2399 whitespace at line beginning.
2402 * Changes in Emacs 25.1 on Non-Free Operating Systems
2405 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2406 This includes the makefile.w32-in files in various subdirectories, and
2407 the support files. The file nt/configure.bat now just tells the user
2408 to use the procedure described in nt/INSTALL, by running the Posix
2409 'configure' script in the top-level directory.
2412 ** Building Emacs for MS-Windows requires at least Windows XP
2413 or Windows Server 2003. The built binaries still run on all versions
2414 of Windows starting with Windows 9X.
2417 ** Emacs running on MS-Windows now supports the daemon mode.
2420 ** The byte counts in etags-generated TAGS files are now the same on
2421 MS-Windows as they are on other platforms.
2424 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2425 Pass '--without-ns' to configure to create an X11 build, the old default.
2428 ** OS X 10.5 or older is no longer supported.
2431 ** OS X on PowerPC is no longer supported.
2434 ** New variable 'ns-use-fullscreen-animation' controls animation for
2435 non-native NS fullscreen. The default is nil. Set to t to enable
2436 animation when entering and leaving fullscreen. For native OSX fullscreen
2440 ** The new function 'w32-application-type' returns the type of an
2441 MS-Windows application given the name of its executable program file.
2443 ** New variable 'w32-pipe-buffer-size'.
2444 It can be used to tune the size of the buffer of pipes created for
2445 communicating with subprocesses, when the program run by a subprocess
2446 exhibits unusual buffering behavior. Default is zero, which lets the
2447 OS use its default size.
2450 ----------------------------------------------------------------------
2451 This file is part of GNU Emacs.
2453 GNU Emacs is free software: you can redistribute it and/or modify
2454 it under the terms of the GNU General Public License as published by
2455 the Free Software Foundation, either version 3 of the License, or
2456 (at your option) any later version.
2458 GNU Emacs is distributed in the hope that it will be useful,
2459 but WITHOUT ANY WARRANTY; without even the implied warranty of
2460 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2461 GNU General Public License for more details.
2463 You should have received a copy of the GNU General Public License
2464 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2470 paragraph-separate: "[
\f]*$"