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 ** The new variable `extended-command-suggest-shorter' has been added
61 to control whether to suggest shorter `M-x' commands or not.
64 ** icomplete now respects `completion-ignored-extensions'.
67 ** Non-breaking hypens are now displayed with the `nobreak-hyphen'
68 face instead of the `escape-glyph' face.
71 ** `C-x h' (`mark-whole-buffer') will now avoid marking the prompt
75 ** `find-library' now takes a prefix argument to pop to a different
78 ** `find-library', `help-function-def' and `help-variable-def' now run
79 `find-function-after-hook'.
82 ** 'process-attributes' on Darwin systems now returns more information.
85 ** Several accessors for the value returned by 'file-attributes'
86 have been added. They are: 'file-attribute-type',
87 'file-attribute-link-number', 'file-attribute-user-id',
88 'file-attribute-group-id', 'file-attribute-access-time',
89 'file-attribute-modification-time',
90 'file-attribute-status-change-time', 'file-attribute-size',
91 'file-attribute-modes', 'file-attribute-inode-number', and
92 'file-attribute-device-number'.
95 ** The new function 'buffer-hash' computes compute a fast, non-consing
96 hash of a buffer's contents.
99 ** 'fill-paragraph' no longer marks the buffer as changed unless it
100 actually changed something.
103 ** The locale language name 'ca' is now mapped to the language
104 environment 'Catalan', which has been added.
107 ** 'align-regexp' has a separate history for its interactive argument.
108 'align-regexp' no longer shares its history with all other
109 history-less functions that use 'read-string'.
112 ** The networking code has been reworked so that it's more
113 asynchronous than it was (when specifying :nowait t in
114 'make-network-process'). How asynchronous it is varies based on the
115 capabilities of the system, but on a typical GNU/Linux system the DNS
116 resolution, the connection, and (for TLS streams) the TLS negotiation
117 are all done without blocking the main Emacs thread. To get
118 asynchronous TLS, the TLS boot parameters have to be passed in (see
119 the manual for details).
121 Certain process oriented functions (like 'process-datagram-address')
122 will block until socket setup has been performed. The recommended way
123 to deal with asynchronous sockets is to avoid interacting with them
124 until they have changed status to "run". This is most easily done
125 from a process sentinel.
127 ** 'make-network-process' and 'open-network-stream' sometimes allowed
128 :service to be an integer string (e.g., :service "993") and sometimes
129 required an integer (e.g., :service 993). This difference has been
130 eliminated, and integer strings work everywhere.
132 ** It is possible to disable attempted recovery on fatal signals.
134 Two new variables support disabling attempts to recover from stack
135 overflow and to avoid automatic auto-save when Emacs is delivered a
136 fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
137 will disable attempts to recover from C stack overflows; Emacs will
138 then crash as with any other fatal signal.
139 'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
140 disable attempts to auto-save the session and shut down in an orderly
141 fashion when Emacs receives a fatal signal; instead, Emacs will
142 terminate immediately. Both variables are non-'nil' by default.
143 These variables are for users who would like to avoid the small
144 probability of data corruption due to techniques Emacs uses to recover
148 ** A second dir-local file (.dir-locals-2.el) is now accepted.
149 See the variable 'dir-locals-file-2' for more information.
152 ** International domain names (IDNA) are now encoded via the new
153 puny.el library, so that one can visit web sites with non-ASCII URLs.
156 ** The new 'timer-list' command lists all active timers in a buffer,
157 where you can cancel them with the 'c' command.
160 ** The new function 'read-multiple-choice' prompts for multiple-choice
161 questions, with a handy way to display help texts.
164 * Editing Changes in Emacs 25.2
167 ** New bindings for 'query-replace-map'.
168 'undo', undo the last replacement; bound to 'u'.
169 'undo-all', undo all replacements; bound to 'U'.
172 * Changes in Specialized Modes and Packages in Emacs 25.2
177 *** Messages from CMake are now recognized.
182 *** In wdired, when editing files to contain slash characters,
183 the resulting directories are automatically created. Whether to do
184 this is controlled by the 'wdired-create-parent-directories' variable.
187 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
188 viewing HTML files and the like.
193 *** A new 's' command for switching to another eww buffer via the minibuffer.
196 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
197 with the 'o' command from 'image-map'.
200 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
201 whether to use the HTML-specified colors or not. The user can also
202 customize the 'shr-use-colors' variable.
205 *** Images that are being loaded are now marked with gray
206 "placeholder" images of the size specified by the HTML. They are then
207 replaced by the real images asynchronously, which will also now
208 respect width/height HTML specs (unless they specify widths/heights
209 bigger than the current window).
214 *** Images are automatically scaled before displaying based on the
215 'image-scaling-factor' variable (if Emacs supports scaling the images
219 *** Images inserted with 'insert-image' and related functions get a
220 keymap put into the text properties (or overlays) that span the
221 image. This keymap binds keystrokes for manipulating size and
222 rotation, as well as saving the image to a file. These commands are
223 also available in 'image-mode'.
226 *** A new library for creating and manipulating SVG images has been
227 added. See the "SVG Images" section in the lispref manual for
231 *** New setf-able function to access and set image parameters is
232 provided: 'image-property'.
235 ** The commands that add ChangeLog entries now prefer a VCS root directory
236 for the ChangeLog file, if none already exists. Customize
237 'change-log-directory-files' to nil for the old behavior.
240 ** Support for non-string values of 'time-stamp-format' has been removed.
245 *** 'message-use-idna' now defaults to t (because Emacs comes with
246 built-in IDNA support now).
249 *** The 'message-valid-fqdn-regexp' variable has been removed, since
250 there are now top-level domains added all the time. Message will no
251 longer warn about sending emails to top-level domains it hasn't heard
254 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
255 In 'visual-line-mode' it will look for the true beginning of a header
256 while in non-'visual-line-mode' it will move the point to the indented
262 *** New connection method "sg", which supports editing files under a
266 *** New connection method "doas" for OpenBSD hosts.
269 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
274 *** Support for completing attribute values and bang-rules using the
275 'completion-at-point' command.
278 ** Emacs now supports character name escape sequences in character and
279 string literals. The syntax variants \N{character name} and
280 \N{U+code} are supported.
283 ** Prog mode has some support for multi-mode indentation.
284 This allows better indentation support in modes that support multiple
285 programming languages in the same buffer, like literate programming
286 environments or ANTLR programs with embedded Python code.
288 A major mode can provide indentation context for a sub-mode through
289 the 'prog-indentation-context' variable. To support this, modes that
290 provide indentation should use 'prog-widen' instead of 'widen' and
291 'prog-first-column' instead of a literal zero. See the node
292 "Mode-Specific Indent" in the ELisp manual for more details.
296 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
302 *** The new function 'url-cookie-delete-cookie' can be used to
303 programmatically delete all cookies, or cookies from a specific
307 *** `url-retrieve-synchronously' now takes an optional timeout parameter.
310 *** The URL package now support HTTPS over proxies supporting CONNECT.
313 *** 'url-user-agent' now defaults to 'default', and the User-Agent
314 string is computed dynamically based on 'url-privacy-level'.
316 ** VC and related modes
319 *** The VC state indicator in the mode line now defaults to more
320 colorful faces to make it more obvious to the user what the state is.
321 See the 'vc-faces' customization group.
324 * New Modes and Packages in Emacs 25.2
327 * Incompatible Lisp Changes in Emacs 25.2
330 ** Resizing a frame no longer runs 'window-configuration-change-hook'.
331 Put your function on 'window-size-change-functions' instead.
333 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
334 mode to send the same escape sequences that xterm does. This makes
335 things like forward-word in readline work.
338 ** hideshow mode got four key bindings that are analogous to outline
339 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
341 ** The grep/rgrep/lgrep functions will now ask about saving files
342 before running. This is controlled by the 'grep-save-buffers'
346 * Lisp Changes in Emacs 25.2
348 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss.
350 ** Autoload files can be generated without timestamps,
351 by setting 'autoload-timestamps' to nil.
352 FIXME As an experiment, nil is the current default.
353 If no insurmountable problems before next release, it can stay that way.
355 ** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
359 ** 'gnutls-boot' now takes a parameter :complete-negotiation that says
360 that negotiation should complete even on non-blocking sockets.
363 ** New functions 'window-pixel-width-before-size-change' and
364 'window-pixel-height-before-size-change' support detecting which
365 window changed size when 'window-size-change-functions' are run.
368 ** New function 'display-buffer-reuse-mode-window' is an action function
369 suitable for use in 'display-buffer-alist'. For example, to avoid creating
370 a new window when opening man pages when there's already one, use
371 (add-to-list 'display-buffer-alist
372 '("\\`\\*Man .*\\*\\'" .
373 (display-buffer-reuse-mode-window
374 (inhibit-same-window . nil)
378 ** There is now a new variable 'flyspell-sort-corrections-function'
379 that allows changing the way corrections are sorted.
382 ** The new command 'fortune-message' has been added, which displays
383 fortunes in the echo area.
386 ** New function 'func-arity' returns information about the argument list
387 of an arbitrary function. This generalizes 'subr-arity' for functions
388 that are not built-in primitives. We recommend using this new
389 function instead of 'subr-arity'.
392 ** 'parse-partial-sexp' state has a new element. Element 10 is
393 non-nil when the last character scanned might be the first character
394 of a two character construct, i.e., a comment delimiter or escaped
395 character. Its value is the syntax of that last character.
398 ** 'parse-partial-sexp''s state, element 9, has now been confirmed as
399 permanent and documented, and may be used by Lisp programs. Its value
400 is a list of currently open parenthesis positions, starting with the
401 outermost parenthesis.
404 ** 'read-color' will now display the color names using the color itself
405 as the background color.
407 ** The function 'redirect-debugging-output' now works on platforms
408 other than GNU/Linux.
411 ** The new function 'string-version-lessp' compares strings by
412 interpreting consecutive runs of numerical characters as numbers, and
413 compares their numerical values. According to this predicate,
414 "foo2.png" is smaller than "foo12.png".
417 ** The new function 'char-from-name' converts a Unicode name string
418 to the corresponding character code.
421 ** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
422 Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
423 two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
424 ('sxhash-eql') on them will be the same.
427 ** Function 'sxhash' has been renamed to 'sxhash-equal' for
428 consistency with the new functions. For compatibility, 'sxhash'
429 remains as an alias to 'sxhash-equal'.
432 ** Time conversion functions that accept a time zone rule argument now
433 allow it to be OFFSET or a list (OFFSET ABBR), where the integer
434 OFFSET is a count of seconds east of Universal Time, and the string
435 ABBR is a time zone abbreviation. The affected functions are
436 'current-time-string', 'current-time-zone', 'decode-time',
437 'format-time-string', and 'set-time-zone-rule'.
440 * Changes in Emacs 25.2 on Non-Free Operating Systems
442 ** Intercepting hotkeys on Windows 7 and later now works better.
443 The new keyboard hooking code properly grabs system hotkeys such as
444 Win-* and Alt-TAB, in a way that Emacs can get at them before the
445 system. This makes the 'w32-register-hot-key' functionality work
446 again on all versions of MS-Windows starting with Windows 7. On
447 Windows NT and later you can now register any hotkey combination. (On
448 Windows 9X, the previous limitations, spelled out in the Emacs manual,
451 ** `convert-standard-filename' no longer mirrors slashes on MS-Windows.
452 Previously, on MS-Windows this function converted slash characters in
453 file names into backslashes. It no longer does that.
456 * Installation Changes in Emacs 25.1
459 ** Building Emacs now requires C99 or later.
462 ** Building Emacs now requires GNU make, version 3.81 or later.
465 ** New configure option --with-cairo.
466 This builds Emacs with Cairo drawing. As a side effect, it provides
467 support for built-in printing, when Emacs was built with GTK+.
468 Cairo drawing is an experimental feature in Emacs, and subject to
469 change in future releases.
472 ** New configure option --with-modules.
473 This enables support for loading dynamic modules; see below.
476 ** By default, Emacs no longer works on IRIX. We expect that Emacs
477 users are not affected by this, as SGI stopped supporting IRIX in
478 December 2013. If you are affected, please send a bug report. You
479 should be able to work around the problem either by porting the Emacs
480 undumping code to GCC under IRIX, or by configuring --with-wide-int,
481 or by sticking with Emacs 24.4.
484 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
485 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
486 since Emacs 24.4, and the other variants were undocumented and were
487 obstacles to maintenance and development. GC_MARK_STACK and its
488 related symbols have been removed from the C internals.
491 ** 'configure' now prefers gnustep-config when configuring GNUstep.
492 If gnustep-config is not available, the old heuristics are used.
495 ** 'configure' now prefers inotify to gfile for file notification,
496 unless gfile is explicitly requested via --with-file-notification='gfile'.
499 ** 'configure' detects the kqueue file notification library on *BSD
500 and Mac OS X machines.
503 ** The configure option '--with-pkg-config-prog' has been removed.
504 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
507 ** The configure option '--with-mmdf' has been removed.
508 It was no longer useful, as it relied on libraries that are no longer
509 supported, and its presence led to confusion during configuration.
510 This affects only the 'movemail' utility; Emacs itself can still
511 process MMDF-format files as before.
514 ** The configure option '--enable-silent-rules' is now the default,
515 and silent rules are now quieter. To get the old behavior where
516 'make' chatters a lot, configure with '--disable-silent-rules' or
517 build with 'make V=1'.
520 ** The configure option '--with-gameuser' now allows you to specify a
521 group instead of a user if its argument is prefixed by ':' (a colon).
522 This will cause the game score files in ${localstatedir}/games/emacs
523 to be owned by that group, and the helper program for updating them to
524 be installed setgid. The option now defaults to the 'games' group.
527 ** The 'grep-changelog' script (and its manual page) are no longer included.
528 It has no particular connection to Emacs and has not changed in years,
529 so if you want to use it, you can always take a copy from an older Emacs.
532 ** Emacs 25 comes with a new set of icons.
533 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
534 The old Emacs logo icons are available as 'emacs23.png' in the same location.
537 ** New make target 'check-expensive' to run additional tests.
538 This includes all tests which run via "make check", plus additional
539 tests which take more time to perform.
542 * Startup Changes in Emacs 25.1
545 ** When Emacs is given a file as a command line argument and
546 'initial-buffer-choice' is non-nil, display both the file and
547 'initial-buffer-choice'. When Emacs is given more than one file and
548 'initial-buffer-choice' is non-nil, show 'initial-buffer-choice'
549 and *Buffer List*. This makes Emacs convenient to use from the
550 command line when 'initial-buffer-choice' is non-nil.
553 ** The value of 'initial-scratch-message' is now treated as a doc string
554 and can contain escape sequences for command keys, quotes, and the like.
557 ** The default height of GUI frames was enlarged.
558 This is so there's enough space in the initial window to display the
559 optional text about recovering crashes sessions, without losing the
560 splash image display.
563 * Changes in Emacs 25.1
566 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
567 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
568 xwidget support, you can access the embedded webkit browser with 'M-x
569 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
570 browser. The buffer will have a new mode, 'xwidget-webkit-mode'
571 (similar to 'image-mode'), which supports the webkit widget.
574 *** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
575 'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
576 'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
577 'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
578 'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
579 'xwidget-webkit-scroll-up'.
582 ** Emacs can now load shared/dynamic libraries (modules).
583 A dynamic Emacs module is a shared library that provides additional
584 functionality for use in Emacs Lisp programs, just like a package
585 written in Emacs Lisp would. The functions 'load', 'require',
586 'load-file', etc. were extended to load such modules, as they do with
587 Emacs Lisp packages. The new variable 'module-file-suffix' holds the
588 system-dependent value of the file-name extension ('.so' on Posix
589 hosts) of the module files.
591 A module should export a C-callable function named
592 'emacs_module_init', which Emacs will call as part of the call to
593 'load' or 'require' which loads the module. It should also export a
594 symbol named 'plugin_is_GPL_compatible' to indicate that its code is
595 released under the GPL or compatible license; Emacs will refuse to
596 load modules that don't export such a symbol.
598 If a module needs to call Emacs functions, it should do so through the
599 API defined and documented in the header file 'emacs-module.h'. Note
600 that any module that provides Lisp-callable functions will have to use
601 Emacs functions such as 'fset' and 'funcall', in order to register its
602 functions with the Emacs Lisp interpreter.
604 Modules can create 'user-ptr' Lisp objects that embed pointers to C
605 structs defined by the module. This is useful for keeping around
606 complex data structures created by a module, to be passed back to the
607 module's functions. User-ptr objects can also have associated
608 "finalizers" -- functions to be run when the object is GC'ed; this is
609 useful for freeing any resources allocated for the underlying data
610 structure, such as memory, open file descriptors, etc. A new
611 predicate 'user-ptrp' returns non-nil if its argument is a 'user-ptr'
614 Loadable modules in Emacs are an experimental feature, and subject to
615 change in future releases. For that reason, their support is disabled
616 by default, and must be enabled by using the '--with-modules' option
620 ** Network security (TLS/SSL certificate validity and the like) is
621 added via the new Network Security Manager (NSM) and controlled via
622 the 'network-security-level' variable.
625 ** C-h l now also lists the commands that were run.
628 ** x-select-enable-clipboard is renamed select-enable-clipboard
629 and x-select-enable-primary is renamed select-enable-primary.
630 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
631 name it), with the proviso that on some systems (e.g. Windows)
632 select-enable-primary is ineffective since the system doesn't
633 have the equivalent of a primary selection.
636 ** New option 'switch-to-buffer-in-dedicated-window' allows you to
637 customize how 'switch-to-buffer' proceeds interactively when the
638 selected window is strongly dedicated to its buffer.
641 ** The option 'even-window-heights' has been renamed to
642 'even-window-sizes' and now handles window widths as well.
645 ** terpri gets an optional arg ENSURE to conditionally output a newline.
648 ** 'insert-register' now leaves point after the inserted text
649 when called interactively. A prefix argument toggles this behavior.
652 ** The new variable 'term-file-aliases' replaces some files from lisp/term.
653 The function 'tty-run-terminal-initialization' consults this variable
654 when deciding what terminal-specific initialization code to run.
657 ** New variable 'system-configuration-features', listing some of the
658 main features that Emacs was compiled with. This is mainly intended
659 for use in Emacs bug reports.
662 ** A password is now hidden also when typed in batch mode. Another
663 hiding character but the default '.' can be used by let-binding the
664 variable 'read-hide-char'.
667 ** The Emacs pseudo-random number generator can be securely seeded.
668 On system where Emacs can access the system entropy or some other
669 cryptographically secure random stream, it now uses that when 'random'
670 is called with its argument 't'. This allows cryptographically strong
671 random values; in particular, the Emacs server now uses this facility
672 to produce its authentication key.
675 ** New input methods: 'tamil-dvorak' and 'programmer-dvorak'.
678 * Editing Changes in Emacs 25.1
681 ** M-x suggests shorthands and ignores obsolete commands for completion.
686 *** Successive single-char deletions are collapsed in the undo-log just like
687 successive char insertions. Which commands invoke this behavior is
688 controlled by the new 'undo-auto-amalgamate' function. See the node
689 "Undo" in the ELisp manual for more details.
692 *** The heuristic used to insert 'undo-boundary' after each command
693 has changed, so that if a command causes changes in more than just the
694 current buffer, Emacs now calls 'undo-boundary' in every buffer
695 affected by the command.
698 ** New command 'comment-line' bound to 'C-x C-;'.
700 ** New and improved facilities for inserting Unicode characters
703 *** Unicode names entered via C-x 8 RET now use substring completion by default.
706 *** C-x 8 now has shorthands for several chars, such as U+2010
707 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH). As
708 before, you can type C-x 8 C-h to list shorthands.
711 *** New minor mode electric-quote-mode for using curved quotes as you
712 type. See also the new variable 'text-quoting-style'.
715 ** New minor mode global-eldoc-mode is enabled by default.
718 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
719 Bracketed paste mode causes text terminals to wrap pasted text in special
720 escape sequences that allow Emacs to tell the difference between text
721 you type and text you paste from other applications. Emacs then
722 avoids interpreting each character in the pasted text as it does with
723 keyboard input, which results in a paste experience similar to that
724 under a window system, and significant performance improvements when
725 pasting large amounts of text.
727 Bracketed paste mode is disabled by default, so Emacs automatically
728 enables it at startup if the terminal supports it.
731 ** Emacs now supports the latest version of the UBA.
732 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
733 was updated to support all the latest additions and changes introduced
734 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
735 This includes full support for directional isolates and the
736 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
740 ** You can access 'mouse-buffer-menu' (C-down-mouse-1) using C-f10.
743 ** New buffer-local 'electric-pair-local-mode'.
746 ** New variable 'fast-but-imprecise-scrolling' inhibits
747 fontification during full screen scrolling operations, giving less
748 hesitant operation during auto-repeat of C-v, M-v at the cost of
749 possible inaccuracies in the end position.
752 ** New documentation command 'describe-symbol'.
753 Works for functions, variables, faces, etc. It is bound to 'C-h o' by
757 ** New function 'custom-prompt-customize-unsaved-options' checks for
758 unsaved customizations and prompts user to customize (if found). It
759 is intended for adding to 'kill-emacs-query-functions'.
762 ** The old 'C-x w' bindings in hi-lock-mode are officially deprecated
763 in favor of the global 'M-s h' bindings introduced in Emacs-23.1.
764 They'll disappear soon.
767 * Changes in Specialized Modes and Packages in Emacs 25.1
772 *** New command 'checkdoc-package-keywords' checks if the
773 current package keywords are recognized. Set the new option
774 'checkdoc-package-keywords-flag' to non-nil to make
775 'checkdoc-current-buffer' call this function automatically.
778 *** New function 'checkdoc-file' checks for style errors.
779 It's meant for use together with 'compile':
780 emacs -batch --eval "(checkdoc-file \"subr.el\")"
785 *** The desktop format version has been upgraded from 206 to 208.
786 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
787 cannot read a version 208 desktop. To upgrade your desktop file, you
788 must explicitly request the upgrade, by C-u M-x desktop-save. You are
789 recommended to do this as soon as you have firmly upgraded to Emacs
790 25.1 (or later). Should you ever need to downgrade your desktop file
791 to version 206, you can do this with C-u C-u M-x desktop-save.
794 ** New function 'bookmark-set-no-overwrite' bound to C-x r M.
795 It raises an error if a bookmark of that name already exists,
796 unlike 'bookmark-set' which silently updates an existing bookmark.
801 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
802 now control how mm-* functions fetch and display images in an HTML
803 message. Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
804 for that purpose, i.e., binds mm-html- variables with those gnus-
805 variables, but other packages do not have to bind gnus- variables now.
808 *** 'mm-inline-text-html-with-images' has been removed.
809 Use 'mm-html-inhibit-images' instead. Note that the value is opposite
815 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
816 GnuTLS encryption functions if possible.
821 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
822 the ordering of object keys by default.
825 *** New commands 'json-pretty-print-ordered' and
826 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
827 object keys sorted alphabetically.
829 ** Prettify Symbols mode
832 *** Prettify Symbols mode supports custom composition predicates. By
833 overriding the default 'prettify-symbols-compose-predicate', modes can
834 specify in which contexts a symbol may be displayed as some Unicode
835 character. 'prettify-symbols-default-compose-p' is the default which
836 is suitable for most programming languages such as C or Lisp (but not
840 *** Symbols can be unprettified while point is inside them.
841 New variable 'prettify-symbols-unprettify-at-point' configures this.
843 ** Enhanced xterm support
846 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
847 This variable tells Emacs which advanced capabilities are available in
848 the xterm terminal emulator used to display Emacs text-mode frames.
849 The default is to check each capability, and use it if available.
850 (This variable was introduced in Emacs 24.1, but was not announced in
854 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
855 in the surrounding GUI (using the OSC-52 escape sequence). This only works
856 if your xterm supports it and enables the 'allowWindowOps' options (disabled
857 by default at least in Debian, for security reasons).
859 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
860 escape sequence) if your xterm has the feature enabled but for that you
861 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
864 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
867 ** The way to turn on and off 'save-place' mode has changed.
868 It is no longer sufficient to load the saveplace library and set
869 'save-place' non-nil. Instead, use the two new minor modes:
870 'save-place-mode' turns on saving last place in every file, and
871 'save-place-local-mode' does that only for the file in whose buffer it
872 is invoked. The 'save-place' variable is now an obsolete alias for
873 'save-place-mode', which replaces it, and 'toggle-save-place' is an
874 obsolete alias for the new 'save-place-local-mode' command.
879 *** ERC can now hide message types by network or channel.
880 'erc-hide-list' will hide all messages of the specified type, while
881 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
882 specified message types for the respective specified targets.
885 *** Reconnection is now asynchronous.
888 *** Nick completion is now case-insensitive again after inadvertently
889 being made case-sensitive in Emacs 24.2.
894 *** New commands, key binds, and menu items.
896 **** '<' and '>' for navigating previous and next tracks in playlist
898 **** New play/pause command 'mpc-toggle-play' bound to 's'
900 **** 'g' bound to new command 'mpc-seek-current' will navigate current
903 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
904 toggling playback modes.
907 *** Now supports connecting to a UNIX domain socket.
910 *** Looks at more image file names to use as album art.
911 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
912 (XP) in addition to cover.jpg.
915 *** Searches in more locations for MPD configuration files.
916 MPD supports the XDG base directory specification since version 0.17.6.
921 *** 'midnight-mode' is now a proper minor mode.
924 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
929 *** New "external" package status.
930 An external package is any installed package that's not built-in and
931 not from 'package-user-dir', which usually means it's from an entry in
932 'package-directory-list'. They are treated much like built-in
933 packages, in that they cannot be deleted through the package menu and
934 are not considered for upgrades.
936 The effect is that a user can manually place a specific version of a
937 package inside 'package-directory-list' and the package menu will
941 *** If a package is available on multiple archives and one has higher
942 priority (as per 'package-archive-priorities') only that one is
943 listed. This can be configured with 'package-menu-hide-low-priority'.
946 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
947 This includes the above-mentioned low-priority packages, as well as
948 available packages whose version is lower than the currently installed
949 version (which were previously impossible to display).
950 This allows users to downgrade a package if a lower version is
954 *** When filtering the package menu, keywords starting with "arc:" or
955 "status:" represent package archive or status, respectively, instead
959 *** Most functions which involve downloading information now take an
960 ASYNC argument. If it is non-nil, package.el performs the download(s)
964 *** New variable 'package-menu-async' controls whether the
965 package-menu uses asynchronous downloads.
968 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
969 This follows the same rules as installing from a .tar file, except the
970 -pkg file is optional.
973 *** Packages which are dependencies of other packages cannot be deleted.
974 The FORCE argument to 'package-delete' overrides this.
977 *** New custom variable 'package-selected-packages' tracks packages
978 which were installed by the user (as opposed to installed as
979 dependencies). This variable can also be manually customized.
982 *** New command 'package-install-selected-packages' installs all
983 packages from 'package-selected-packages' which are currently missing.
986 *** 'package-install' function now takes a DONT-SELECT argument. If
987 this function is called interactively or if DONT-SELECT is nil, add the
988 package being installed to 'package-selected-packages'.
991 *** New command 'package-autoremove' removes all packages which were
992 installed strictly as dependencies but are no longer needed.
997 When you invoke 'shell' interactively, the *shell* buffer will now
998 display in a new window. However, you can customize this behavior via
999 the 'display-buffer-alist' variable. For example, to get
1000 the old behavior -- *shell* buffer displays in current window -- use
1001 (add-to-list 'display-buffer-alist
1002 '("^\\*shell\\*$" . (display-buffer-same-window))).
1006 *** The ':protection' slot option is not obeyed any more.
1008 *** The 'newname' argument to constructors is optional&deprecated.
1009 If you need your objects to be named, do it by inheriting from 'eieio-named'.
1011 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
1013 *** The <class> variables are declared obsolete.
1015 *** The <initarg> variables are declared obsolete.
1017 *** defgeneric and defmethod are declared obsolete.
1018 Use the equivalent facilities from cl-generic.el instead.
1020 *** 'constructor' is now an obsolete alias for 'make-instance'.
1021 --- 'pcase' accepts a new UPattern 'eieio'.
1026 *** New command 'ido-bury-buffer-at-head' bound to C-S-b
1027 Bury the buffer at the head of 'ido-matches', analogous to how C-k
1028 kills the buffer at head.
1031 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
1032 meaning, and the list is restricted to those elements that do not
1033 match the current input.
1038 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
1039 The new commands 'next-line-or-history-element' and
1040 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
1041 minibuffer, allow by-line movement through minibuffer history,
1042 similarly to an ordinary buffer. Only when point moves over
1043 the bottom/top of the minibuffer it goes to the next/previous history
1044 element. 'M-p' and 'M-n' still move directly to previous/next history
1047 ** Search and Replace
1050 *** 'isearch' and 'query-replace' can now perform character folding in matches.
1051 This is analogous to case folding, but instead of disregarding case
1052 variants, it disregards wider classes of distinctions between similar
1053 characters. (Case folding is a special case of character folding.)
1054 This means many characters in the search string will match entire
1055 groups of characters instead of just themselves.
1057 For instance, the ASCII double quote character " will match all
1058 variants of double quotes, and the letter 'a' will match all of its
1059 accented cousins, even those composed of multiple characters, as well
1060 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
1063 Character folding is enabled by customizing 'search-default-mode' to
1064 the value 'character-fold-to-regexp'. You can also toggle character
1065 folding in the middle of a search by typing 'M-s ''.
1067 'query-replace' honors character folding if the new variable
1068 'replace-character-fold' is customized to a non-nil value.
1071 *** New user option 'search-default-mode'.
1072 This option specifies the default mode for Isearch. The default
1073 value, nil specifies that Isearch does literal searches (however,
1074 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
1075 as in previous Emacs versions).
1078 *** New function 'character-fold-to-regexp' can be used
1079 by searching commands to produce a regexp matching anything that
1080 character-folds into STRING.
1083 *** The new M-s M-w key binding uses eww to search the web for the
1084 text in the region. The search engine to use for this is specified by
1085 the customizable variable 'eww-search-prefix'.
1088 *** Query-replace history is enhanced.
1089 When query-replace reads the FROM string from the minibuffer, typing
1090 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
1091 and TO are the original text and its replacement, and SEP is an arrow
1092 string defined by the new variable 'query-replace-from-to-separator'.
1093 To select a prior replacement, type 'M-p' until the desired
1094 replacement appears in the minibuffer, and then exit the minibuffer by
1099 *** If 'quick-calc' is called with a prefix argument, insert the
1100 result of the calculation into the current buffer.
1103 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
1104 this you can tell Edebug not to stop at the start of the first
1105 instrumented function.
1110 *** New minor mode 'global-eldoc-mode'
1111 It is turned on by default, and affects '*scratch*' and other buffers
1112 whose major mode supports Emacs Lisp.
1115 *** 'eldoc-documentation-function' now defaults to 'ignore'
1118 *** 'describe-char-eldoc' displays information about character at point,
1119 and can be used as a default value of 'eldoc-documentation-function'. It is
1120 useful when, for example, one needs to distinguish various spaces - e.g.,
1121 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
1122 using mono-spaced font.
1127 *** HTML can now be rendered using variable-width fonts.
1130 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
1131 whether to use variable-pitch fonts or not. The user can also
1132 customize the 'shr-use-fonts' variable.
1135 *** A new command 'R' ('eww-readable') will try do identify the main
1136 textual parts of a web page and display only that, leaving menus and
1137 the like off the page.
1140 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
1141 toggle the paragraph direction between left-to-right and right-to-left.
1144 *** You can now use several eww buffers in parallel by renaming eww
1145 buffers you want to keep separate.
1148 *** Partial state of the eww buffers (the URIs and the titles of the
1149 pages visited) is now preserved in the desktop file.
1152 *** 'eww-after-render-hook' is now called after eww has rendered
1153 the data in the buffer.
1156 *** The 'eww-reload' command now takes a prefix to not reload via
1157 the net, but just use the local copy of the HTML.
1160 *** The DOM shr and eww uses has been changed to the general Emacs
1161 xml.el/libxml2 DOM, and a new package dom.el has been added to
1162 interact with this DOM. See the Emacs Lisp manual for interface
1166 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
1169 *** The new 'S' command will list all eww buffers, and allow managing
1173 *** https pages with valid certificates have headers marked in green, while
1174 invalid certificates are marked in red.
1179 *** text/html messages that contain inline image parts will be
1180 transformed into multipart/related messages before sending.
1183 ** In Show Paren Mode, a parenthesis can be highlighted when point
1184 stands inside it, and certain parens can be highlighted when point is
1185 at BOL or EOL, or in whitespace there. To enable these, customize,
1186 respectively, 'show-paren-when-point-inside-paren' or
1187 'show-paren-when-point-in-periphery'.
1190 ** If gpg2 exists on the system, it is now used as the default value
1191 of 'epg-gpg-program' (instead of gpg).
1196 *** Strings after ':documentation' are highlighted as docstrings.
1197 This enhances Lisp mode fontification to handle documentation of the
1198 form '(:documentation "the doc string")' used in Common Lisp code for
1199 CLOS class and slot documentation.
1201 ** Rectangle editing
1204 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
1207 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
1208 *** 'string-rectangle' provides on-the-fly preview of the result.
1211 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
1212 These should be used in preference to 'font-lock-fontify-buffer' when
1216 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
1217 to 'minibuffer-setup-hook'.
1219 If the first argument of the macro is of the form '(:append FUN)',
1220 then FUN will be appended to 'minibuffer-setup-hook', instead of
1225 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
1228 *** 'pcase' accepts the new UPattern 'cl-struct'.
1230 ** Calendar and diary
1233 *** The default 'diary-file' is now located in .emacs.d.
1236 *** New commands to insert diary entries with Chinese dates:
1237 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
1238 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
1241 *** The calendar can now list and mark diary entries with Chinese dates.
1242 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
1245 *** The option 'calendar-mode-line-format' can now be nil,
1246 which means to do nothing special with the mode line in calendars.
1249 *** New option 'calendar-weekend-days'.
1250 The option customizes which day headers receive the
1251 'calendar-weekend-header' face.
1254 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
1257 *** Many items obsolete since at least version 23.1 have been removed.
1258 The majority were function/variable/face aliases, too numerous to list here.
1261 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
1262 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
1264 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
1266 **** Macro 'calendar-for-loop'.
1268 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
1270 **** The nil and list forms of 'diary-display-function'.
1273 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
1274 If the output of ERT tests in batch mode execution can be saved to a
1275 log file, then it can be passed as an argument to the above function
1276 to produce a neat summary.
1279 ** New js.el option 'js-indent-first-init'.
1284 ** Info mode now displays symbol names in fixed-pitch font.
1285 If you want to get the old behavior back, customize the 'Info-quoted'
1286 face to use the same definitions as the default face.
1289 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
1292 *** 'info-display-manual' can now be given a prefix argument which (any
1293 non-nil value) directs the command to limit the completion
1294 alternatives to currently visited manuals.
1297 ** ntlm.el has support for NTLM2.
1302 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
1303 to delete or undelete multiple messages.
1306 *** Rmail can now render HTML mail messages if your Emacs was built with
1307 libxml2 or if you have the Lynx browser installed. By default, Rmail
1308 will display the HTML version of a mail message that has both HTML and
1309 plain text parts, if display of HTML email is possible; customize the
1310 'rmail-mime-prefer-html' option to 'nil' if you don't want that.
1313 *** In the commands that make summaries by subject, recipients, or senders,
1314 you can no longer use commas to separate regular expressions.
1317 ** SES now supports local printer functions; see 'ses-define-local-printer'.
1319 ** Shell-script Mode
1321 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
1322 specify the type of shell in use (bash, csh, etc).
1325 *** New value 'always' for 'sh-indent-after-continuation'.
1326 This provides old-style ("dumb") indentation of continued lines.
1327 See the doc string of 'sh-indent-after-continuation' for details.
1331 *** Fatal TLS errors are now silent by default.
1334 *** If Emacs isn't built with TLS support, an external TLS-capable
1335 program is used instead. This program used to be run in --insecure
1336 mode by default, but has now changed to be secure instead, and will
1337 fail if you try to connect to non-verifiable hosts. This is
1338 controlled by the 'tls-program' variable.
1343 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1344 When 'url-handler-mode' is enabled, file operations for these
1345 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1348 *** The URL package allows customizing the 'url-user-agent' string.
1349 The new 'url-user-agent' variable can be customized to be a string or
1353 *** The new interface variable 'url-request-noninteractive' can be used
1354 to specify that we're running in a noninteractive context, and that
1355 we should not be queried about things like TLS certificate validity.
1358 *** 'url-mime-accept-string' can now be used as in "interface"
1359 variable, meaning you can bind it around an 'url-retrieve' call.
1362 *** If URL is used with a https connection, the first callback argument
1363 plist will contain a :peer element that has the output of
1364 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
1369 *** New connection method "afp", which allows you to access Mac OS X
1370 volumes via the Apple Filing Protocol.
1373 *** New connection method "nc", which allows you to access dumb
1377 *** Method-specific parameters can be overwritten now with variable
1378 'tramp-connection-properties'.
1381 *** Handler for 'file-notify-valid-p' for remote machines that support
1382 filesystem notifications.
1387 *** New user variable 'sql-default-directory' enables remote
1388 connections using Tramp.
1391 *** New command 'sql-send-line-and-next'.
1392 This command, bound to 'C-c C-n' by default, sends the current line to
1393 the SQL process and advances to the next line, skipping whitespace and
1397 *** Added support for Vertica SQL.
1399 ** VC and related modes
1402 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
1403 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1404 (undocumented) command vc-hg-push now behaves slightly differently.
1407 *** The new command vc-region-history shows the log+diff of the active region.
1410 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
1411 This command is useful when you perform version control commands
1412 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1413 back-end for the buffer's file, or remove it from version control.
1416 *** New option 'vc-annotate-background-mode' controls whether
1417 the color range from 'vc-annotate-color-map' is applied to the
1418 background or to the foreground.
1421 *** New options for customizing encoding of Git commit log messages.
1422 The new user options 'vc-git-commits-coding-system' and
1423 'vc-git-log-output-coding-system' specify the encoding of log messages
1424 sent to Git when committing, and the decoding of log messages read
1425 from Git history commands. These options default to UTF-8; if
1426 customized, they should be consistent with the Git config variables
1427 i18n.commitEncoding and i18n.logOutputEncoding.
1428 ('vc-git-commits-coding-system' existed previously, but was a
1429 variable, not a user option.)
1432 *** 'compare-windows' now compares text with the most recently selected window
1433 instead of the next window. If you want the previous behavior of
1434 comparing with the next window, customize the new option
1435 'compare-windows-get-window-function' to the value
1436 'compare-windows-get-next-window'.
1439 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
1440 replace the face 'compare-windows', which is now an obsolete alias for
1441 'compare-windows-added'.
1444 *** The VC state indicator in the mode line now has different faces
1445 corresponding to each of the possible states. See the 'vc-faces'
1446 customization group.
1449 *** 'log-edit-insert-changelog' converts "(tiny change)" to
1450 "Copyright-paperwork-exempt: yes". Set 'log-edit-rewrite-tiny-change'
1451 nil to disable this.
1454 *** vc-mcvs.el has been removed.
1457 ** VHDL mode now supports VHDL'08.
1462 *** Decimal display mode uses "," groups, so it's more
1463 fitting for use in money calculations
1466 *** Factorial works with non-integer inputs.
1471 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1472 macro argument expansion, interactive macro evaluation and automatic
1473 scanning of #define'd symbols.
1476 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
1477 result of evaluating a macro.
1480 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
1481 all defined symbols in 'hide-ifdef-env'.
1484 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
1485 file name patterns. Defaults to files whose extension is one of '.h',
1486 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
1489 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
1490 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1491 (This could happen when an idempotent header file is visited again,
1492 when its guard symbol is already defined.) Defaults to 't'.
1495 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
1496 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1497 looking for macro definitions. By default, no symbols are ignored.
1502 *** New custom variable 'tex-print-file-extension' to help users who
1503 use PDF instead of DVI.
1506 *** TeX mode now supports Prettify Symbols mode. When enabling
1507 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1508 many other math macros are displayed using unicode characters.
1511 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
1512 By default, 32 consecutive spaces or four consecutive TABs are
1513 considered to be too deep, but the new variable
1514 'whitespace-big-indent-regexp' can be customized to change that.
1517 ** New options in 'tildify-mode'.
1518 New options 'tildify-space-string', 'tildify-pattern', and
1519 'tildify-foreach-region-function' variables make
1520 'tildify-string-alist', 'tildify-pattern-alist', and
1521 'tildify-ignored-environments-alist' variables (as well as a few
1522 helper functions) obsolete.
1525 ** New package Xref replaces Etags's front-end and UI
1527 The new package Xref provides a generic framework and new commands to
1528 find and move to definitions of functions, macros, data structures
1529 etc., as well as go back to the location where you were before moving
1530 to a definition. It supersedes and obsoletes many Etags commands,
1531 while still using the etags.el code that reads the TAGS tables as one
1534 The command 'xref-find-definitions' replaces 'find-tag' and provides
1535 an interface to pick one definition among several.
1536 'tags-loop-continue' is now unbound. 'xref-pop-marker-stack' replaces
1537 'pop-tag-mark', but has a keybinding ('M-,') different from the one
1538 'pop-tag-mark' used.
1540 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
1541 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
1542 'xref-find-apropos' replaces 'find-tag-regexp'.
1544 As a result of this, the following commands are now obsolete:
1545 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
1548 'tags-loop-continue' is not obsolete because it's still useful in
1549 'tags-search' and 'tags-query-replace', for which there are no direct
1553 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
1554 replaced by xref-style commands, see the "Dired" section below.
1559 'find-tag-marker-ring-length' is now an obsolete alias for
1560 'xref-marker-ring-length'. 'find-tag-marker-ring' is now an obsolete
1561 alias for a private variable. 'xref-push-marker-stack' and
1562 'xref-pop-marker-stack' should be used instead to manipulate the stack
1563 of searches for definitions.
1566 *** 'xref-find-definitions' and 'describe-function' now display
1567 information about mode local overrides (defined by cedet/mode-local.el
1568 'define-overloadable-function' 'define-mode-local-overrides').
1570 The framework's Lisp API is still experimental and can change in major,
1571 backward-incompatible ways.
1574 ** New package Project
1576 The new package Project provides generic infrastructure for dealing
1577 with projects. The main commands included in it are
1578 'project-find-file' and 'project-find-regexp'.
1580 The Lisp API of this package is still experimental.
1583 EUDC's LDAP backend has been improved.
1586 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1589 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1590 subprocess instead of on the command line.
1593 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1594 need to configure this manually anymore.
1597 *** The LDAP configuration section of EUDC's manual has been
1600 There have also been customization changes.
1603 *** New custom variable 'eudc-server-hotlist' to allow specifying
1604 multiple EUDC servers in init file.
1607 *** Custom variable 'eudc-inline-query-format' defaults to completing
1608 on email and firstname instead of surname.
1611 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
1612 to avoid interfering with the kill ring.
1615 *** Custom variable 'eudc-inline-expansion-format' defaults to
1616 "Firstname Surname <mail-address>".
1619 *** Custom variable 'eudc-options-file' defaults to
1620 "~/.emacs.d/eudc-options".
1623 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
1624 allow overriding the regular expression that recognizes the ldapsearch
1625 command line's password prompt.
1628 EUDC's BBDB backend now supports BBDB 3.
1631 EUDC's PH backend (eudcb-ph.el) is obsolete.
1636 *** The new built-in command 'clear' can scroll window contents out of sight.
1637 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1640 *** New buffer syntax '#<buffer-name>', which is equivalent to
1641 '#<buffer buffer-name>'. This shorthand makes interacting with
1642 buffers from eshell more convenient. Custom variable
1643 'eshell-buffer-shorthand', which has been broken for a while, has been
1647 *** By default, eshell "visual" program buffers (created by
1648 'eshell-visual-commands' and similar custom vars) are no longer killed
1649 when their processes die. This fixes issues with short-lived commands
1650 and makes visual programs more useful in general. For example, if
1651 "git log" is a visual command, it will always show the visual command
1652 buffer, even if the "git log" process dies. For the old behavior,
1653 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
1658 *** Support for the Google Chrome web browser.
1661 *** Support for the Conkeror web browser.
1664 *** Support for several ancient browsers is now officially obsolete.
1667 ** tar-mode: new 'tar-new-entry' command, allowing for new members to
1668 be added to the archive.
1673 *** Dired buffers are also auto-reverted via file notifications, if
1674 Emacs is compiled with file notification support.
1677 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
1678 See <http://debbugs.gnu.org/22814>.
1680 ** File Notifications
1683 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1686 *** The new event 'stopped' signals, that a file notification watch is
1687 not active any longer.
1690 *** The new function 'file-notify-valid-p' checks, whether a file
1691 notification descriptor still corresponds to an activate watch.
1696 *** The command 'dired-do-compress' bound to 'Z' now can compress
1697 directories and decompress zip files.
1700 *** New command 'dired-do-compress-to' bound to 'c' can be used to
1701 compress many marked files into a single named archive. The
1702 compression command is determined from the new
1703 'dired-compress-files-alist' variable.
1706 *** New user interface for the 'A' and 'Q' commands.
1707 These keys, now bound to 'dired-do-find-regexp' and
1708 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
1709 and 'xref-query-replace-in-results': they present the matches
1710 in the '*xref*' buffer and let you move through the matches. No need
1711 to use 'tags-loop-continue' to resume the search or replace loop. The
1712 previous commands, 'dired-do-search' and
1713 'dired-do-query-replace-regexp', are still available, but not bound to
1714 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
1715 back. We intend to obsolete the old commands in a future release.
1717 ** Tabulated List Mode
1720 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
1721 call 'tabulated-list-init-header', in which case it will have no
1725 *** 'tabulated-list-print' takes a second optional argument, update,
1726 which specifies an alternative printing method which is faster when
1727 few or no entries have changed.
1729 ** Obsolete packages
1735 *** landmark.el (moved to elpa.gnu.org)
1738 * New Modes and Packages in Emacs 25.1
1741 ** pinentry.el allows GnuPG passphrase to be prompted through the
1742 minibuffer instead of a graphical dialog, depending on whether the gpg
1743 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1744 is set). This feature requires newer versions of GnuPG (2.1.5 or
1745 later) and Pinentry (0.9.5 or later). To use this feature, add
1746 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1747 configuration with "gpgconf --reload gpg-agent".
1750 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1751 The main entry points are 'cl-defgeneric' and 'cl-defmethod'. See the
1752 node "Generic Functions" in the Emacs Lisp manual for more details.
1755 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1756 SCSS (Sassy CSS) files.
1759 ** let-alist is a new macro (and a package) that allows one to easily
1760 let-bind the values stored in an alist.
1763 ** 'tildify-mode' allows automatic insertion of hard spaces as one
1764 types the text. Breaking line after a single-character words is
1765 forbidden by Czech and Polish typography (and may be discouraged in
1766 other languages), so 'auto-tildify-mode' makes it easier to create
1767 a typographically-correct documents.
1770 ** The 'seq' library adds sequence manipulation functions and macros
1771 that complement basic functions provided by subr.el. All functions
1772 are prefixed with 'seq-' and work on lists, strings and vectors.
1773 'pcase' accepts a new Upattern 'seq'.
1776 ** The 'map' library provides map-manipulation functions that work on
1777 alists, hash-table and arrays. All functions are prefixed with
1778 'map-'. 'pcase' accepts a new UPattern 'map'.
1781 ** The 'thunk' library provides functions and macros to control the
1782 evaluation of forms.
1785 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1786 support for JSX, an XML-like syntax extension to ECMAScript.
1789 * Incompatible Lisp Changes in Emacs 25.1
1792 ** 'setq' and 'setf' must now be called with an even number of
1793 arguments. The earlier behavior of silently supplying a nil to the
1794 last variable when there was an odd number of arguments has been
1798 ** 'syntax-begin-function' is declared obsolete.
1799 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1800 slot in font-lock-defaults.
1803 ** The new implementation of Subword mode affects word movement everywhere.
1804 When Subword mode is turned on, 'forward-word', 'backward-word', and
1805 everything that uses them will move by sub-words, effectively
1806 overriding the buffer's syntax table. Lisp programs that shouldn't be
1807 affected by Subword mode should call the new functions
1808 'forward-word-strictly' and 'backward-word-strictly' instead.
1811 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
1812 called during startup. Users who call this function in their init
1813 file and still expect it to be run after startup should set
1814 'package-enable-at-startup' to t after the call to
1815 'package-initialize'.
1818 ** ':global' minor mode use 'setq-default' rather than 'setq'.
1819 This means that you can't use 'make-local-variable' and expect them to
1820 "magically" become buffer-local.
1823 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
1824 The 'track-mouse' form no longer refrains from changing the shape of
1825 the mouse pointer for the entire time the body of that form is
1826 executed. Lisp programs that use 'track-mouse' for dragging across
1827 large portions of the Emacs display, and want to avoid changes in the
1828 pointer shape during dragging, should bind the variable 'track-mouse'
1829 to the special value 'dragging' in the body of the form.
1832 ** The optional 'predicate' argument of 'lisp-complete-symbol' no longer
1833 has any effect. (This change was made in Emacs 24.4 but was not
1834 advertised at the time.)
1837 ** 'indirect-function' does not signal 'void-function' any more.
1838 This is mostly a bug-fix, since this change was missed back in 24.4 when
1839 symbol-function was changed not to signal 'void-function' any more.
1842 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
1845 ** M-x shell and M-x compile no longer set the EMACS environment variable.
1846 This avoids clashing when other programs use the variable for other purposes.
1847 Although M-x term still sets EMACS for compatibility with Bash 4.3 and earlier,
1848 this is deprecated and will be phased out when Bash 4.4 or later takes over.
1849 Use the INSIDE_EMACS environment variable instead.
1852 ** 'save-excursion' does not save&restore the mark any more.
1853 Use 'save-mark-and-excursion' if you want the old behavior.
1856 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
1857 argument ('predicate').
1860 ** 'completion-table-dynamic' by default stays in the minibuffer.
1861 The minibuffer will be the current buffer when the function is called.
1862 If you want the old behavior of calling the function in the buffer
1863 from which the minibuffer was entered, use the new argument
1864 'switch-buffer' to 'completion-table-dynamic'.
1867 ** window-configurations no longer record the buffers' marks.
1870 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1871 active region handling.
1874 ** deactivate-mark is now buffer-local.
1877 ** 'cl-the' now asserts that its argument is of the given type.
1880 ** 'process-running-child-p' may now return a numeric process
1881 group ID instead of 't'.
1884 ** Mouse click events on mode line or header line no longer include
1885 any reference to a buffer position. The 6th member of the mouse
1886 position list returned for such events is now nil.
1889 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1890 These slots used to hold key-shortcut data, but have been obsolete since
1894 ** Emacs no longer downcases the first letter of a system diagnostic
1895 when signaling a file error. For example, it now reports "Permission
1896 denied" instead of "permission denied". The old behavior was problematic
1897 in languages like German where downcasing rules depend on grammar.
1900 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
1901 Set it to 'curve' for curved single quotes, to 'straight' for straight
1902 apostrophes, and to 'grave' for grave accent and apostrophe. The
1903 default value nil acts like 'curve' if curved single quotes are
1904 displayable, and like 'grave' otherwise. The new variable affects
1905 display of diagnostics and help, but not of info.
1908 ** substitute-command-keys now replaces quotes.
1909 That is, it converts documentation strings' quoting style as per the
1910 value of 'text-quoting-style'. Doc strings in source code can use
1911 either curved single quotes or grave accents and apostrophes. As
1912 before, characters preceded by \= are output as-is.
1915 ** Message-issuing functions 'error', 'message', etc. now convert quotes.
1916 They use the new 'format-message' function instead of plain 'format',
1917 so that they now follow user preference as per 'text-quoting-style'
1918 when processing curved single quotes, grave accents, and apostrophes
1919 in their format argument.
1922 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1923 now match multibyte characters using Unicode character properties.
1924 If you want the old behavior where they matched any character with
1925 word syntax, use '\sw' instead.
1928 ** The character classes [:graph:] and [:print:] in regular expressions
1929 no longer match every multibyte character. Instead, Emacs now
1930 consults the Unicode character properties to determine which
1931 characters are graphic or printable. In particular, surrogates and
1932 unassigned codepoints are now rejected. If you want the old behavior,
1933 use [:multibyte:] instead.
1936 ** The 'diff' command uses the unified format now. To restore the old
1937 behavior, set 'diff-switches' to '-c'.
1940 ** 'grep-template' and 'grep-find-template' values don't include the
1941 --color argument anymore. It's added at the <C> place holder position
1942 dynamically. Any third-party code that changes these templates should
1943 be updated accordingly.
1946 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
1947 The new behavior is compatible with Common Lisp and with XEmacs.
1948 This change does not affect Lisp code intended to be portable to
1949 Emacs 24.2 and earlier, which did not support unary '/'.
1952 ** The 'default-directory' value doesn't have to end slash. To make
1953 that happen, 'unhandled-file-name-directory' now defaults to calling
1954 'file-name-as-directory'.
1957 * Lisp Changes in Emacs 25.1
1961 *** New UPatterns 'quote', 'app'.
1963 *** New UPatterns can be defined with 'pcase-defmacro'.
1965 *** New vector QPattern.
1968 ** syntax-propertize is now automatically called on-demand during forward
1969 parsing functions like 'forward-sexp'.
1972 ** New hooks 'prefix-command-echo-keystrokes-functions' and
1973 'prefix-command-preserve-state-hook' allow the definition of prefix
1974 commands other than the predefined 'C-u'.
1977 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
1978 These allow conversion between buffer positions and the corresponding
1979 file byte offsets, given the file's encoding.
1982 ** The default value of 'load-read-function' is now 'read'.
1983 Previously, the default value of 'nil' implied using 'read'.
1986 ** New hook 'pre-redisplay-functions'.
1987 It is a bit easier to use than 'pre-redisplay-function'.
1990 ** The second arg of 'looking-back' should always be provided explicitly.
1991 Previously, it was an optional argument, now it's mandatory.
1994 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
1995 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
1996 implemented by the new 'cursor-intangible-mode' and
1997 'cursor-sensor-mode' minor modes.
2000 ** 'inhibit-point-motion-hooks' now defaults to 't' and is obsolete.
2001 Use the new minor modes 'cursor-intangible-mode' and
2002 'cursor-sensor-mode' instead.
2005 ** New process type 'pipe', which can be used in combination with the
2006 ':stderr' keyword of make-process to handle standard error output
2010 ** New function 'make-process' provides an alternative interface to
2011 'start-process'. It allows programs to set process parameters such as
2012 process filter, sentinel, etc., through keyword arguments (similar to
2013 'make-network-process').
2016 ** A new function 'directory-files-recursively' returns all matching
2017 files (recursively) under a directory.
2020 ** New variable 'inhibit-message', when bound to non-nil, inhibits
2021 'message' and related functions from displaying messages in the echo
2022 area. The output is still logged to the *Messages* buffer.
2025 ** A new text property 'inhibit-read-only' can be used in read-only
2026 buffers to allow certain parts of the text to be writable.
2029 ** A new variable 'comment-end-can-be-escaped' is useful in languages
2030 such as C and C++ where line comments with escaped newlines are
2031 continued to the next line.
2034 ** New macro 'define-advice'.
2037 ** Emacs Lisp now supports generators.
2038 See the "Generators" section of the ELisp manual for the details.
2041 ** New finalizer facility for running code when objects become unreachable.
2042 See the "Finalizer Type" subsection in the ELisp manual for the
2046 ** lexical closures can use (:documentation FORM) to build their docstring.
2047 It should be placed right where the docstring would be, and FORM is then
2048 evaluated (and should return a string) when the closure is built.
2051 ** define-inline provides a new way to define inlinable functions.
2054 ** New function 'macroexpand-1' to perform a single step of macro expansion.
2057 ** Some "x-*" functions were obsoleted and/or renamed:
2058 *** x-select-text is renamed gui-select-text.
2059 *** x-selection-value is renamed gui-selection-value.
2060 *** x-get-selection is renamed gui-get-selection.
2061 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
2062 *** x-get-selection-value is renamed to gui-get-primary-selection.
2063 *** x-set-selection is renamed to gui-set-selection
2066 ** New function 'string-greaterp', which return the opposite result of
2070 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
2071 preserve the collation order as defined by the system's locale(1)
2072 environment. For the time being this is implemented for modern POSIX
2073 systems and for MS-Windows, for other systems they fall back to their
2074 counterparts 'string-lessp' and 'string-equal'.
2077 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
2078 The effect is that, on systems that use ls-lisp for Dired, the default
2079 sort order of the files in Dired is now different from what it was in
2080 previous versions of Emacs. In particular, the file names are sorted
2081 disregarding punctuation, accents, and diacritics, and letter case is
2082 ignored. For example, files whose name begin with a period will no
2083 longer appear near the beginning of the directory listing. If you
2084 want the old, locale-independent sorting, customize the new option
2085 'ls-lisp-use-string-collate' to the nil value.
2088 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
2089 if set to a non-nil value, causes the above 2 functions to ignore
2090 symbol and punctuation characters when collating strings. This
2091 emulates the behavior of modern Posix platforms when the locale's
2092 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
2093 MS-Windows doesn't support UTF-8 as codeset in its locales.
2096 ** New function 'alist-get', which is also a valid place (aka lvalue).
2099 ** New function 'funcall-interactively', which works like 'funcall'
2100 but makes 'called-interactively-p' treat the function as (you guessed it)
2101 called interactively.
2104 ** New function 'function-put' to use instead of 'put' for function properties.
2107 ** The new function 'bidi-find-overridden-directionality' allows you to
2108 find characters whose directionality was, perhaps maliciously,
2109 overridden by directional override control characters. Lisp programs
2110 can use this to detect potential phishing of URLs and other links that
2111 exploits bidirectional display reordering.
2114 ** The new function 'buffer-substring-with-bidi-context' allows you to
2115 copy a portion of a buffer into a different location while preserving
2116 the visual appearance both of the copied text and the text at
2117 destination, even when the copied text includes mixed bidirectional
2118 text and directional control characters.
2121 ** New properties that can be specified with 'declare':
2122 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
2123 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
2124 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
2128 ** New macro 'with-file-modes', for evaluating expressions with default file
2129 permissions set to temporary values (e.g., for creating private files).
2132 ** You can access the slots of structures using 'cl-struct-slot-value'.
2135 ** Function 'sort' can deal with vectors.
2138 ** Function 'system-name' now returns an updated value if the current
2139 system's name has changed or if the Emacs process has changed systems,
2140 and to avoid long waits it no longer consults DNS to canonicalize the
2141 name. The variable 'system-name' is now obsolete.
2144 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
2147 ** If 'pwd' is called with a prefix argument, insert the current default
2151 ** New functions return extended information about fonts and faces.
2154 *** The function 'font-info' now returns more details about a font.
2155 In particular, it now returns the average width of the font's
2156 characters, which can be used for geometry-related calculations.
2159 *** A new function 'default-font-width' returns the average width of a
2160 character in the current buffer's default font. If the default face
2161 is remapped (see 'face-remapping-alist'), the value for the remapped
2162 face is returned. This function complements the existing function
2163 'default-font-height'.
2166 *** New functions 'window-font-height' and 'window-font-width' return
2167 the height and average width of characters in a specified face and
2168 window. If FACE is remapped (see 'face-remapping-alist'), the
2169 function returns the information for the remapped face.
2172 *** A new function 'window-max-chars-per-line' returns the maximal
2173 number of characters that can be displayed on one line. If a face
2174 and/or window are provided, these values are used for the
2175 calculation. This function is different from 'window-body-width' in
2176 that it accounts for (i) continuation glyphs, (ii) the size of the
2177 font, and (iii) the specified window.
2180 ** New utilities in subr-x.el:
2181 *** New macros 'if-let' and 'when-let' allow defining bindings and to
2182 execute code depending whether all values are true.
2183 *** New macros 'thread-first' and 'thread-last' allow threading a form
2184 as the first or last argument of subsequent forms.
2187 ** Documentation strings now support quoting with curved single quotes
2188 in addition to the old style with grave accent and apostrophe. The
2189 new style looks better on today's displays. In the new Electric Quote
2190 mode, you can enter curved single quotes into documentation by typing
2191 grave accent and apostrophe. Outside Electric Quote mode, you can
2192 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
2193 works) by typing 'A-[' and 'A-]'. As described above under
2194 'text-quoting-style', the user can specify how to display doc string
2198 ** New function 'format-message' is like 'format' and also converts
2199 curved single quotes, grave accents and apostrophes as per
2200 'text-quoting-style'.
2203 ** show-help-function's arg is converted via substitute-command-keys
2204 before being passed to the function. Help strings, help-echo
2205 properties, etc. can therefore contain command key escapes and
2209 ** Time-related changes:
2211 *** Time conversion functions now accept an optional ZONE argument
2212 that specifies the time zone rules for conversion. ZONE is omitted or
2213 nil for Emacs local time, t for Universal Time, 'wall' for system wall
2214 clock time, or a string as in the TZ environment variable. The
2215 affected functions are 'current-time-string', 'current-time-zone',
2216 'decode-time', and 'format-time-string'. The function 'encode-time',
2217 which already accepted a simple time zone rule argument, has been
2218 extended to accept all the new forms.
2220 *** Incompatible change in the third argument of 'format-time-string'.
2221 Previously, any non-nil argument was interpreted as specifying Universal Time.
2222 This is no longer true; packages that want Universal Time should pass t
2223 as the third argument.
2225 *** Time-related functions now consistently accept numbers
2226 (representing seconds since the epoch) and nil (representing the
2227 current time) as well as the usual list-of-integer representation.
2228 Affected functions include 'current-time-string', 'current-time-zone',
2229 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
2230 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
2231 'time-to-days', and 'time-to-seconds'.
2233 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
2236 *** 'calendar-next-time-zone-transition', 'time-add', and
2237 'time-subtract' no longer return time values in the obsolete and
2238 undocumented integer-pair format. Instead, they return a list of two
2242 ** New function 'set-binary-mode' allows switching a standard stream
2243 of the Emacs process to binary I/O mode.
2246 ** The new function 'directory-name-p' can be used to check whether a file
2247 name (as returned from, for instance, 'file-name-all-completions') is
2248 a directory file name. It returns non-nil if the last character in
2249 the name is a directory separator character (forward slash on GNU and
2250 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2253 ** ASCII approximations to curved quotes are put in standard-display-table
2254 if the terminal cannot display curved quotes.
2257 ** Standard output and error streams now transliterate characters via
2258 standard-display-table, and encode output using locale-coding-system.
2259 To force a specific encoding, bind 'coding-system-for-write' to the
2260 coding-system of your choice when invoking functions like 'prin1' and
2264 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
2267 ** New possible value for 'system-type': 'nacl'.
2268 This is used by Google's Native Client (NaCl).
2270 ** Miscellaneous name change
2273 For consistency with the usual Emacs spelling, the Lisp variable
2274 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
2275 The old name should still work, as an obsolescent alias.
2277 ** Changes in Frame- and Window- Handling
2280 *** Emacs can now draw horizontal scroll bars on some platforms that
2281 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2282 Horizontal scroll bars are turned off by default.
2284 **** New function 'horizontal-scroll-bars-available-p' telling whether
2285 horizontal scroll bars are available on the underlying system.
2287 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
2288 bars on all existing and future frames.
2290 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
2291 scroll bars on the selected frame.
2293 **** New frame parameters 'horizontal-scroll-bars' and
2294 'scroll-bar-height' to set horizontal scroll bars and their height
2295 for individual frames and in 'default-frame-alist'.
2297 **** New functions 'frame-scroll-bar-height' and
2298 'window-scroll-bar-height' return the height of horizontal scroll
2299 bars on a specific frame or window.
2301 **** 'set-window-scroll-bars' now accepts five parameters where the last
2302 two specify height and type of the window's horizontal scroll bar.
2304 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
2307 **** New buffer-local variables 'horizontal-scroll-bar' and
2308 'scroll-bar-height'.
2311 *** New functions 'frame-geometry' and 'frame-edges' give access to a
2315 *** New functions 'mouse-absolute-pixel-position' and
2316 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
2320 *** The function 'window-edges' now accepts three additional arguments to
2321 retrieve body, absolute and pixel edges of the window.
2324 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
2325 'window-inside-absolute-pixel-edges' have been renamed to respectively
2326 'window-body-edges', 'window-body-pixel-edges' and
2327 'window-absolute-body-pixel-edges'. The old names are kept as aliases.
2330 *** New function 'window-absolute-pixel-position' to get the screen
2331 coordinates of a visible buffer position.
2334 *** The height of a frame's menu and tool bar are no longer counted in the
2335 frame's text height. This means that the text height stands only for
2336 the height of the frame's root window plus that of the echo area (if
2337 present). This was already the behavior for frames with external tool
2338 and menu bars (like in the Gtk builds) but has now been extended to all
2342 *** Frames now do not necessarily preserve the number of columns or lines
2343 they display when setting default font, menu bar, fringe width, or
2344 scroll bars. In particular, maximized and fullscreen frames are
2345 conceptually never resized if such settings change. For fullheight and
2346 fullwidth frames, the behavior may depend on the toolkit used.
2347 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
2348 setting default font, menu bar, fringe width, or scroll bars of a
2349 specific frame does not resize that frame in order to preserve the
2350 number of columns or lines it displays.
2353 *** New function 'window-preserve-size' allows you to preserve the size of
2354 a window without "fixing" it. It's supported by 'fit-window-to-buffer',
2355 'temp-buffer-resize-mode' and 'display-buffer'.
2358 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
2359 This displays the buffer in an existing frame other than the current
2360 frame, and allows the caller to specify a frame predicate to exclude
2364 *** New minor mode 'window-divider-mode' and options
2365 'window-divider-default-places', 'window-divider-default-bottom-width'
2366 and 'window-divider-default-right-width'.
2369 *** The window displaying the '*Completions*' buffer with minibuffer
2370 completion candidates is now shown at the bottom of the selected
2371 frame. The size of that window is always as large as required to
2372 display all the candidates, except when limited by the minimum size
2373 of the other windows on that frame; those other windows are resized
2374 to provide space for the '*Completions*' display. The Emacs manual
2375 describes how to customize 'display-buffer-alist' to get back the old
2376 behavior, see the node "Temporary Displays" there.
2379 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2380 Those features have been deprecated in Gtk+ for a long time.
2385 *** etags no longer qualifies class members by default.
2387 By default, 'etags' will not qualify class members for Perl and C-like
2388 object-oriented languages with their class names and namespaces, and
2389 will remove qualifications used explicitly in the code from the tag
2390 names it puts in TAGS files. This is so the etags.el back-end for
2391 'xref-find-definitions' is more accurate and produces less false
2394 Use --class-qualify (-Q) if you want the old default behavior of
2395 qualifying class members in C++, Java, Objective C, and Perl. Note
2396 that using -Q might make some class members become "unknown" to 'M-.'
2397 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
2398 qualified names by hand.
2401 *** New language Ruby
2403 Names of modules, classes, methods, functions, and constants are
2404 tagged. Overloaded operators are also tagged.
2408 Names of packages, functions, and types are tagged.
2411 *** Improved support for Lua
2413 Etags now tags functions even if the "function" keyword follows some
2414 whitespace at line beginning.
2417 * Changes in Emacs 25.1 on Non-Free Operating Systems
2420 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2421 This includes the makefile.w32-in files in various subdirectories, and
2422 the support files. The file nt/configure.bat now just tells the user
2423 to use the procedure described in nt/INSTALL, by running the Posix
2424 'configure' script in the top-level directory.
2427 ** Building Emacs for MS-Windows requires at least Windows XP
2428 or Windows Server 2003. The built binaries still run on all versions
2429 of Windows starting with Windows 9X.
2432 ** Emacs running on MS-Windows now supports the daemon mode.
2435 ** The byte counts in etags-generated TAGS files are now the same on
2436 MS-Windows as they are on other platforms.
2439 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2440 Pass '--without-ns' to configure to create an X11 build, the old default.
2443 ** OS X 10.5 or older is no longer supported.
2446 ** OS X on PowerPC is no longer supported.
2449 ** New variable 'ns-use-fullscreen-animation' controls animation for
2450 non-native NS fullscreen. The default is nil. Set to t to enable
2451 animation when entering and leaving fullscreen. For native OSX fullscreen
2455 ** The new function 'w32-application-type' returns the type of an
2456 MS-Windows application given the name of its executable program file.
2458 ** New variable 'w32-pipe-buffer-size'.
2459 It can be used to tune the size of the buffer of pipes created for
2460 communicating with subprocesses, when the program run by a subprocess
2461 exhibits unusual buffering behavior. Default is zero, which lets the
2462 OS use its default size.
2465 ----------------------------------------------------------------------
2466 This file is part of GNU Emacs.
2468 GNU Emacs is free software: you can redistribute it and/or modify
2469 it under the terms of the GNU General Public License as published by
2470 the Free Software Foundation, either version 3 of the License, or
2471 (at your option) any later version.
2473 GNU Emacs is distributed in the hope that it will be useful,
2474 but WITHOUT ANY WARRANTY; without even the implied warranty of
2475 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2476 GNU General Public License for more details.
2478 You should have received a copy of the GNU General Public License
2479 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2485 paragraph-separate: "[
\f]*$"