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-name' will now fall back on looking at 'load-history'
61 to try to locate libraries that have been loaded with an explicit path
65 ** Faces in 'minibuffer-prompt-properties' no longer overwrite properties
66 in the text in functions like 'read-from-minibuffer', but instead are
67 added to the end of the face list. This allows users to say things
68 like '(read-from-minibuffer (propertize "Enter something: " 'face 'bold))'.
71 ** The new variable 'extended-command-suggest-shorter' has been added
72 to control whether to suggest shorter 'M-x' commands or not.
75 ** icomplete now respects 'completion-ignored-extensions'.
78 ** Non-breaking hyphens are now displayed with the 'nobreak-hyphen'
79 face instead of the 'escape-glyph' face.
82 ** 'C-x h' ('mark-whole-buffer') will now avoid marking the prompt
86 ** 'find-library' now takes a prefix argument to pop to a different
89 ** 'find-library', 'help-function-def' and 'help-variable-def' now run
90 'find-function-after-hook'.
93 ** 'process-attributes' on Darwin systems now returns more information.
96 ** Several accessors for the value returned by 'file-attributes'
97 have been added. They are: 'file-attribute-type',
98 'file-attribute-link-number', 'file-attribute-user-id',
99 'file-attribute-group-id', 'file-attribute-access-time',
100 'file-attribute-modification-time',
101 'file-attribute-status-change-time', 'file-attribute-size',
102 'file-attribute-modes', 'file-attribute-inode-number', and
103 'file-attribute-device-number'.
106 ** The new function 'buffer-hash' computes compute a fast, non-consing
107 hash of a buffer's contents.
110 ** 'fill-paragraph' no longer marks the buffer as changed unless it
111 actually changed something.
114 ** The locale language name 'ca' is now mapped to the language
115 environment 'Catalan', which has been added.
118 ** 'align-regexp' has a separate history for its interactive argument.
119 'align-regexp' no longer shares its history with all other
120 history-less functions that use 'read-string'.
123 ** The networking code has been reworked so that it's more
124 asynchronous than it was (when specifying :nowait t in
125 'make-network-process'). How asynchronous it is varies based on the
126 capabilities of the system, but on a typical GNU/Linux system the DNS
127 resolution, the connection, and (for TLS streams) the TLS negotiation
128 are all done without blocking the main Emacs thread. To get
129 asynchronous TLS, the TLS boot parameters have to be passed in (see
130 the manual for details).
132 Certain process oriented functions (like 'process-datagram-address')
133 will block until socket setup has been performed. The recommended way
134 to deal with asynchronous sockets is to avoid interacting with them
135 until they have changed status to "run". This is most easily done
136 from a process sentinel.
138 ** 'make-network-process' and 'open-network-stream' sometimes allowed
139 :service to be an integer string (e.g., :service "993") and sometimes
140 required an integer (e.g., :service 993). This difference has been
141 eliminated, and integer strings work everywhere.
143 ** It is possible to disable attempted recovery on fatal signals.
145 Two new variables support disabling attempts to recover from stack
146 overflow and to avoid automatic auto-save when Emacs is delivered a
147 fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
148 will disable attempts to recover from C stack overflows; Emacs will
149 then crash as with any other fatal signal.
150 'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
151 disable attempts to auto-save the session and shut down in an orderly
152 fashion when Emacs receives a fatal signal; instead, Emacs will
153 terminate immediately. Both variables are non-'nil' by default.
154 These variables are for users who would like to avoid the small
155 probability of data corruption due to techniques Emacs uses to recover
159 ** File local and directory local variables are now initialized each
160 time the major mode is set, not just when the file is first visited.
161 These local variables will thus not vanish on setting a major mode.
164 ** A second dir-local file (.dir-locals-2.el) is now accepted.
165 See the variable 'dir-locals-file-2' for more information.
168 ** International domain names (IDNA) are now encoded via the new
169 puny.el library, so that one can visit web sites with non-ASCII URLs.
172 ** The new 'timer-list' command lists all active timers in a buffer,
173 where you can cancel them with the 'c' command.
176 ** The new function 'read-multiple-choice' prompts for multiple-choice
177 questions, with a handy way to display help texts.
180 * Editing Changes in Emacs 25.2
183 ** New bindings for 'query-replace-map'.
184 'undo', undo the last replacement; bound to 'u'.
185 'undo-all', undo all replacements; bound to 'U'.
188 * Changes in Specialized Modes and Packages in Emacs 25.2
193 *** Messages from CMake are now recognized.
198 *** In wdired, when editing files to contain slash characters,
199 the resulting directories are automatically created. Whether to do
200 this is controlled by the 'wdired-create-parent-directories' variable.
203 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
204 viewing HTML files and the like.
208 *** Ediff can be prevented from pausing 1 second after reaching a
209 breakpoint (e.g. with "f" and "o") by customizing the new option
210 `edebug-sit-on-break'.
215 *** A new 's' command for switching to another eww buffer via the minibuffer.
218 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
219 with the 'o' command from 'image-map'.
222 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
223 whether to use the HTML-specified colors or not. The user can also
224 customize the 'shr-use-colors' variable.
227 *** Images that are being loaded are now marked with gray
228 "placeholder" images of the size specified by the HTML. They are then
229 replaced by the real images asynchronously, which will also now
230 respect width/height HTML specs (unless they specify widths/heights
231 bigger than the current window).
236 *** Images are automatically scaled before displaying based on the
237 'image-scaling-factor' variable (if Emacs supports scaling the images
241 *** Images inserted with 'insert-image' and related functions get a
242 keymap put into the text properties (or overlays) that span the
243 image. This keymap binds keystrokes for manipulating size and
244 rotation, as well as saving the image to a file. These commands are
245 also available in 'image-mode'.
248 *** A new library for creating and manipulating SVG images has been
249 added. See the "SVG Images" section in the lispref manual for
253 *** New setf-able function to access and set image parameters is
254 provided: 'image-property'.
257 ** The commands that add ChangeLog entries now prefer a VCS root directory
258 for the ChangeLog file, if none already exists. Customize
259 'change-log-directory-files' to nil for the old behavior.
262 ** Support for non-string values of 'time-stamp-format' has been removed.
267 *** 'message-use-idna' now defaults to t (because Emacs comes with
268 built-in IDNA support now).
271 *** The 'message-valid-fqdn-regexp' variable has been removed, since
272 there are now top-level domains added all the time. Message will no
273 longer warn about sending emails to top-level domains it hasn't heard
276 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
277 In 'visual-line-mode' it will look for the true beginning of a header
278 while in non-'visual-line-mode' it will move the point to the indented
284 *** New connection method "sg", which supports editing files under a
288 *** New connection method "doas" for OpenBSD hosts.
291 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
296 *** Support for completing attribute values, at-rules, bang-rules, and
297 HTML tags using the 'completion-at-point' command.
300 ** Emacs now supports character name escape sequences in character and
301 string literals. The syntax variants \N{character name} and
302 \N{U+code} are supported.
305 ** Prog mode has some support for multi-mode indentation.
306 This allows better indentation support in modes that support multiple
307 programming languages in the same buffer, like literate programming
308 environments or ANTLR programs with embedded Python code.
310 A major mode can provide indentation context for a sub-mode through
311 the 'prog-indentation-context' variable. To support this, modes that
312 provide indentation should use 'prog-widen' instead of 'widen' and
313 'prog-first-column' instead of a literal zero. See the node
314 "Mode-Specific Indent" in the ELisp manual for more details.
318 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
324 *** The new function 'url-cookie-delete-cookie' can be used to
325 programmatically delete all cookies, or cookies from a specific
329 *** 'url-retrieve-synchronously' now takes an optional timeout parameter.
332 *** The URL package now support HTTPS over proxies supporting CONNECT.
335 *** 'url-user-agent' now defaults to 'default', and the User-Agent
336 string is computed dynamically based on 'url-privacy-level'.
338 ** VC and related modes
341 *** The VC state indicator in the mode line now defaults to more
342 colorful faces to make it more obvious to the user what the state is.
343 See the 'vc-faces' customization group.
346 * New Modes and Packages in Emacs 25.2
349 * Incompatible Lisp Changes in Emacs 25.2
352 ** Resizing a frame no longer runs 'window-configuration-change-hook'.
353 Put your function on 'window-size-change-functions' instead.
355 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
356 mode to send the same escape sequences that xterm does. This makes
357 things like forward-word in readline work.
360 ** hideshow mode got four key bindings that are analogous to outline
361 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
363 ** The grep/rgrep/lgrep functions will now ask about saving files
364 before running. This is controlled by the 'grep-save-buffers'
368 * Lisp Changes in Emacs 25.2
370 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss.
373 ** `define-derived-mode' can now specify an :after-hook form, which
374 gets evaluated after the new mode's hook has run. This can be used to
375 incorporate configuration changes made in the mode hook into the
378 ** Autoload files can be generated without timestamps,
379 by setting 'autoload-timestamps' to nil.
380 FIXME As an experiment, nil is the current default.
381 If no insurmountable problems before next release, it can stay that way.
383 ** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
387 ** 'gnutls-boot' now takes a parameter :complete-negotiation that says
388 that negotiation should complete even on non-blocking sockets.
391 ** New functions 'window-pixel-width-before-size-change' and
392 'window-pixel-height-before-size-change' support detecting which
393 window changed size when 'window-size-change-functions' are run.
396 ** New function 'display-buffer-reuse-mode-window' is an action function
397 suitable for use in 'display-buffer-alist'. For example, to avoid creating
398 a new window when opening man pages when there's already one, use
399 (add-to-list 'display-buffer-alist
400 '("\\`\\*Man .*\\*\\'" .
401 (display-buffer-reuse-mode-window
402 (inhibit-same-window . nil)
406 ** There is now a new variable 'flyspell-sort-corrections-function'
407 that allows changing the way corrections are sorted.
410 ** The new command 'fortune-message' has been added, which displays
411 fortunes in the echo area.
414 ** New function 'func-arity' returns information about the argument list
415 of an arbitrary function. This generalizes 'subr-arity' for functions
416 that are not built-in primitives. We recommend using this new
417 function instead of 'subr-arity'.
420 ** 'parse-partial-sexp' state has a new element. Element 10 is
421 non-nil when the last character scanned might be the first character
422 of a two character construct, i.e., a comment delimiter or escaped
423 character. Its value is the syntax of that last character.
426 ** 'parse-partial-sexp''s state, element 9, has now been confirmed as
427 permanent and documented, and may be used by Lisp programs. Its value
428 is a list of currently open parenthesis positions, starting with the
429 outermost parenthesis.
432 ** 'read-color' will now display the color names using the color itself
433 as the background color.
435 ** The function 'redirect-debugging-output' now works on platforms
436 other than GNU/Linux.
439 ** The new function 'string-version-lessp' compares strings by
440 interpreting consecutive runs of numerical characters as numbers, and
441 compares their numerical values. According to this predicate,
442 "foo2.png" is smaller than "foo12.png".
445 ** The new function 'char-from-name' converts a Unicode name string
446 to the corresponding character code.
449 ** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
450 Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
451 two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
452 ('sxhash-eql') on them will be the same.
455 ** Function 'sxhash' has been renamed to 'sxhash-equal' for
456 consistency with the new functions. For compatibility, 'sxhash'
457 remains as an alias to 'sxhash-equal'.
460 ** Time conversion functions that accept a time zone rule argument now
461 allow it to be OFFSET or a list (OFFSET ABBR), where the integer
462 OFFSET is a count of seconds east of Universal Time, and the string
463 ABBR is a time zone abbreviation. The affected functions are
464 'current-time-string', 'current-time-zone', 'decode-time',
465 'format-time-string', and 'set-time-zone-rule'.
468 * Changes in Emacs 25.2 on Non-Free Operating Systems
470 ** Intercepting hotkeys on Windows 7 and later now works better.
471 The new keyboard hooking code properly grabs system hotkeys such as
472 Win-* and Alt-TAB, in a way that Emacs can get at them before the
473 system. This makes the 'w32-register-hot-key' functionality work
474 again on all versions of MS-Windows starting with Windows 7. On
475 Windows NT and later you can now register any hotkey combination. (On
476 Windows 9X, the previous limitations, spelled out in the Emacs manual,
479 ** 'convert-standard-filename' no longer mirrors slashes on MS-Windows.
480 Previously, on MS-Windows this function converted slash characters in
481 file names into backslashes. It no longer does that.
484 * Installation Changes in Emacs 25.1
487 ** Building Emacs now requires C99 or later.
490 ** Building Emacs now requires GNU make, version 3.81 or later.
493 ** New configure option --with-cairo.
494 This builds Emacs with Cairo drawing. As a side effect, it provides
495 support for built-in printing, when Emacs was built with GTK+.
496 Cairo drawing is an experimental feature in Emacs, and subject to
497 change in future releases.
500 ** New configure option --with-modules.
501 This enables support for loading dynamic modules; see below.
504 ** By default, Emacs no longer works on IRIX. We expect that Emacs
505 users are not affected by this, as SGI stopped supporting IRIX in
506 December 2013. If you are affected, please send a bug report. You
507 should be able to work around the problem either by porting the Emacs
508 undumping code to GCC under IRIX, or by configuring --with-wide-int,
509 or by sticking with Emacs 24.4.
512 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
513 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
514 since Emacs 24.4, and the other variants were undocumented and were
515 obstacles to maintenance and development. GC_MARK_STACK and its
516 related symbols have been removed from the C internals.
519 ** 'configure' now prefers gnustep-config when configuring GNUstep.
520 If gnustep-config is not available, the old heuristics are used.
523 ** 'configure' now prefers inotify to gfile for file notification,
524 unless gfile is explicitly requested via --with-file-notification='gfile'.
527 ** 'configure' detects the kqueue file notification library on *BSD
528 and Mac OS X machines.
531 ** The configure option '--with-pkg-config-prog' has been removed.
532 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
535 ** The configure option '--with-mmdf' has been removed.
536 It was no longer useful, as it relied on libraries that are no longer
537 supported, and its presence led to confusion during configuration.
538 This affects only the 'movemail' utility; Emacs itself can still
539 process MMDF-format files as before.
542 ** The configure option '--enable-silent-rules' is now the default,
543 and silent rules are now quieter. To get the old behavior where
544 'make' chatters a lot, configure with '--disable-silent-rules' or
545 build with 'make V=1'.
548 ** The configure option '--with-gameuser' now allows you to specify a
549 group instead of a user if its argument is prefixed by ':' (a colon).
550 This will cause the game score files in ${localstatedir}/games/emacs
551 to be owned by that group, and the helper program for updating them to
552 be installed setgid. The option now defaults to the 'games' group.
555 ** The 'grep-changelog' script (and its manual page) are no longer included.
556 It has no particular connection to Emacs and has not changed in years,
557 so if you want to use it, you can always take a copy from an older Emacs.
560 ** Emacs 25 comes with a new set of icons.
561 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
562 The old Emacs logo icons are available as 'emacs23.png' in the same location.
565 ** New make target 'check-expensive' to run additional tests.
566 This includes all tests which run via "make check", plus additional
567 tests which take more time to perform.
570 * Startup Changes in Emacs 25.1
573 ** When Emacs is given a file as a command line argument and
574 'initial-buffer-choice' is non-nil, display both the file and
575 'initial-buffer-choice'. When Emacs is given more than one file and
576 'initial-buffer-choice' is non-nil, show 'initial-buffer-choice'
577 and *Buffer List*. This makes Emacs convenient to use from the
578 command line when 'initial-buffer-choice' is non-nil.
581 ** The value of 'initial-scratch-message' is now treated as a doc string
582 and can contain escape sequences for command keys, quotes, and the like.
585 ** The default height of GUI frames was enlarged.
586 This is so there's enough space in the initial window to display the
587 optional text about recovering crashes sessions, without losing the
588 splash image display.
591 * Changes in Emacs 25.1
594 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
595 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
596 xwidget support, you can access the embedded webkit browser with 'M-x
597 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
598 browser. The buffer will have a new mode, 'xwidget-webkit-mode'
599 (similar to 'image-mode'), which supports the webkit widget.
602 *** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
603 'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
604 'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
605 'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
606 'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
607 'xwidget-webkit-scroll-up'.
610 ** Emacs can now load shared/dynamic libraries (modules).
611 A dynamic Emacs module is a shared library that provides additional
612 functionality for use in Emacs Lisp programs, just like a package
613 written in Emacs Lisp would. The functions 'load', 'require',
614 'load-file', etc. were extended to load such modules, as they do with
615 Emacs Lisp packages. The new variable 'module-file-suffix' holds the
616 system-dependent value of the file-name extension ('.so' on Posix
617 hosts) of the module files.
619 A module should export a C-callable function named
620 'emacs_module_init', which Emacs will call as part of the call to
621 'load' or 'require' which loads the module. It should also export a
622 symbol named 'plugin_is_GPL_compatible' to indicate that its code is
623 released under the GPL or compatible license; Emacs will refuse to
624 load modules that don't export such a symbol.
626 If a module needs to call Emacs functions, it should do so through the
627 API defined and documented in the header file 'emacs-module.h'. Note
628 that any module that provides Lisp-callable functions will have to use
629 Emacs functions such as 'fset' and 'funcall', in order to register its
630 functions with the Emacs Lisp interpreter.
632 Modules can create 'user-ptr' Lisp objects that embed pointers to C
633 structs defined by the module. This is useful for keeping around
634 complex data structures created by a module, to be passed back to the
635 module's functions. User-ptr objects can also have associated
636 "finalizers" -- functions to be run when the object is GC'ed; this is
637 useful for freeing any resources allocated for the underlying data
638 structure, such as memory, open file descriptors, etc. A new
639 predicate 'user-ptrp' returns non-nil if its argument is a 'user-ptr'
642 Loadable modules in Emacs are an experimental feature, and subject to
643 change in future releases. For that reason, their support is disabled
644 by default, and must be enabled by using the '--with-modules' option
648 ** Network security (TLS/SSL certificate validity and the like) is
649 added via the new Network Security Manager (NSM) and controlled via
650 the 'network-security-level' variable.
653 ** C-h l now also lists the commands that were run.
656 ** x-select-enable-clipboard is renamed select-enable-clipboard
657 and x-select-enable-primary is renamed select-enable-primary.
658 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
659 name it), with the proviso that on some systems (e.g. Windows)
660 select-enable-primary is ineffective since the system doesn't
661 have the equivalent of a primary selection.
664 ** New option 'switch-to-buffer-in-dedicated-window' allows you to
665 customize how 'switch-to-buffer' proceeds interactively when the
666 selected window is strongly dedicated to its buffer.
669 ** The option 'even-window-heights' has been renamed to
670 'even-window-sizes' and now handles window widths as well.
673 ** terpri gets an optional arg ENSURE to conditionally output a newline.
676 ** 'insert-register' now leaves point after the inserted text
677 when called interactively. A prefix argument toggles this behavior.
680 ** The new variable 'term-file-aliases' replaces some files from lisp/term.
681 The function 'tty-run-terminal-initialization' consults this variable
682 when deciding what terminal-specific initialization code to run.
685 ** New variable 'system-configuration-features', listing some of the
686 main features that Emacs was compiled with. This is mainly intended
687 for use in Emacs bug reports.
690 ** A password is now hidden also when typed in batch mode. Another
691 hiding character but the default '.' can be used by let-binding the
692 variable 'read-hide-char'.
695 ** The Emacs pseudo-random number generator can be securely seeded.
696 On system where Emacs can access the system entropy or some other
697 cryptographically secure random stream, it now uses that when 'random'
698 is called with its argument 't'. This allows cryptographically strong
699 random values; in particular, the Emacs server now uses this facility
700 to produce its authentication key.
703 ** New input methods: 'tamil-dvorak' and 'programmer-dvorak'.
706 * Editing Changes in Emacs 25.1
709 ** M-x suggests shorthands and ignores obsolete commands for completion.
714 *** Successive single-char deletions are collapsed in the undo-log just like
715 successive char insertions. Which commands invoke this behavior is
716 controlled by the new 'undo-auto-amalgamate' function. See the node
717 "Undo" in the ELisp manual for more details.
720 *** The heuristic used to insert 'undo-boundary' after each command
721 has changed, so that if a command causes changes in more than just the
722 current buffer, Emacs now calls 'undo-boundary' in every buffer
723 affected by the command.
726 ** New command 'comment-line' bound to 'C-x C-;'.
728 ** New and improved facilities for inserting Unicode characters
731 *** Unicode names entered via C-x 8 RET now use substring completion by default.
734 *** C-x 8 now has shorthands for several chars, such as U+2010
735 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH). As
736 before, you can type C-x 8 C-h to list shorthands.
739 *** New minor mode electric-quote-mode for using curved quotes as you
740 type. See also the new variable 'text-quoting-style'.
743 ** New minor mode global-eldoc-mode is enabled by default.
746 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
747 Bracketed paste mode causes text terminals to wrap pasted text in special
748 escape sequences that allow Emacs to tell the difference between text
749 you type and text you paste from other applications. Emacs then
750 avoids interpreting each character in the pasted text as it does with
751 keyboard input, which results in a paste experience similar to that
752 under a window system, and significant performance improvements when
753 pasting large amounts of text.
755 Bracketed paste mode is disabled by default, so Emacs automatically
756 enables it at startup if the terminal supports it.
759 ** Emacs now supports the latest version of the UBA.
760 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
761 was updated to support all the latest additions and changes introduced
762 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
763 This includes full support for directional isolates and the
764 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
768 ** You can access 'mouse-buffer-menu' (C-down-mouse-1) using C-f10.
771 ** New buffer-local 'electric-pair-local-mode'.
774 ** New variable 'fast-but-imprecise-scrolling' inhibits
775 fontification during full screen scrolling operations, giving less
776 hesitant operation during auto-repeat of C-v, M-v at the cost of
777 possible inaccuracies in the end position.
780 ** New documentation command 'describe-symbol'.
781 Works for functions, variables, faces, etc. It is bound to 'C-h o' by
785 ** New function 'custom-prompt-customize-unsaved-options' checks for
786 unsaved customizations and prompts user to customize (if found). It
787 is intended for adding to 'kill-emacs-query-functions'.
790 ** The old 'C-x w' bindings in hi-lock-mode are officially deprecated
791 in favor of the global 'M-s h' bindings introduced in Emacs-23.1.
792 They'll disappear soon.
795 * Changes in Specialized Modes and Packages in Emacs 25.1
800 *** New command 'checkdoc-package-keywords' checks if the
801 current package keywords are recognized. Set the new option
802 'checkdoc-package-keywords-flag' to non-nil to make
803 'checkdoc-current-buffer' call this function automatically.
806 *** New function 'checkdoc-file' checks for style errors.
807 It's meant for use together with 'compile':
808 emacs -batch --eval "(checkdoc-file \"subr.el\")"
813 *** The desktop format version has been upgraded from 206 to 208.
814 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
815 cannot read a version 208 desktop. To upgrade your desktop file, you
816 must explicitly request the upgrade, by C-u M-x desktop-save. You are
817 recommended to do this as soon as you have firmly upgraded to Emacs
818 25.1 (or later). Should you ever need to downgrade your desktop file
819 to version 206, you can do this with C-u C-u M-x desktop-save.
822 ** New function 'bookmark-set-no-overwrite' bound to C-x r M.
823 It raises an error if a bookmark of that name already exists,
824 unlike 'bookmark-set' which silently updates an existing bookmark.
829 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
830 now control how mm-* functions fetch and display images in an HTML
831 message. Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
832 for that purpose, i.e., binds mm-html- variables with those gnus-
833 variables, but other packages do not have to bind gnus- variables now.
836 *** 'mm-inline-text-html-with-images' has been removed.
837 Use 'mm-html-inhibit-images' instead. Note that the value is opposite
843 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
844 GnuTLS encryption functions if possible.
849 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
850 the ordering of object keys by default.
853 *** New commands 'json-pretty-print-ordered' and
854 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
855 object keys sorted alphabetically.
857 ** Prettify Symbols mode
860 *** Prettify Symbols mode supports custom composition predicates. By
861 overriding the default 'prettify-symbols-compose-predicate', modes can
862 specify in which contexts a symbol may be displayed as some Unicode
863 character. 'prettify-symbols-default-compose-p' is the default which
864 is suitable for most programming languages such as C or Lisp (but not
868 *** Symbols can be unprettified while point is inside them.
869 New variable 'prettify-symbols-unprettify-at-point' configures this.
871 ** Enhanced xterm support
874 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
875 This variable tells Emacs which advanced capabilities are available in
876 the xterm terminal emulator used to display Emacs text-mode frames.
877 The default is to check each capability, and use it if available.
878 (This variable was introduced in Emacs 24.1, but was not announced in
882 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
883 in the surrounding GUI (using the OSC-52 escape sequence). This only works
884 if your xterm supports it and enables the 'allowWindowOps' options (disabled
885 by default at least in Debian, for security reasons).
887 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
888 escape sequence) if your xterm has the feature enabled but for that you
889 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
892 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
895 ** The way to turn on and off 'save-place' mode has changed.
896 It is no longer sufficient to load the saveplace library and set
897 'save-place' non-nil. Instead, use the two new minor modes:
898 'save-place-mode' turns on saving last place in every file, and
899 'save-place-local-mode' does that only for the file in whose buffer it
900 is invoked. The 'save-place' variable is now an obsolete alias for
901 'save-place-mode', which replaces it, and 'toggle-save-place' is an
902 obsolete alias for the new 'save-place-local-mode' command.
907 *** ERC can now hide message types by network or channel.
908 'erc-hide-list' will hide all messages of the specified type, while
909 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
910 specified message types for the respective specified targets.
913 *** Reconnection is now asynchronous.
916 *** Nick completion is now case-insensitive again after inadvertently
917 being made case-sensitive in Emacs 24.2.
922 *** New commands, key binds, and menu items.
924 **** '<' and '>' for navigating previous and next tracks in playlist
926 **** New play/pause command 'mpc-toggle-play' bound to 's'
928 **** 'g' bound to new command 'mpc-seek-current' will navigate current
931 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
932 toggling playback modes.
935 *** Now supports connecting to a UNIX domain socket.
938 *** Looks at more image file names to use as album art.
939 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
940 (XP) in addition to cover.jpg.
943 *** Searches in more locations for MPD configuration files.
944 MPD supports the XDG base directory specification since version 0.17.6.
949 *** 'midnight-mode' is now a proper minor mode.
952 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
957 *** New "external" package status.
958 An external package is any installed package that's not built-in and
959 not from 'package-user-dir', which usually means it's from an entry in
960 'package-directory-list'. They are treated much like built-in
961 packages, in that they cannot be deleted through the package menu and
962 are not considered for upgrades.
964 The effect is that a user can manually place a specific version of a
965 package inside 'package-directory-list' and the package menu will
969 *** If a package is available on multiple archives and one has higher
970 priority (as per 'package-archive-priorities') only that one is
971 listed. This can be configured with 'package-menu-hide-low-priority'.
974 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
975 This includes the above-mentioned low-priority packages, as well as
976 available packages whose version is lower than the currently installed
977 version (which were previously impossible to display).
978 This allows users to downgrade a package if a lower version is
982 *** When filtering the package menu, keywords starting with "arc:" or
983 "status:" represent package archive or status, respectively, instead
987 *** Most functions which involve downloading information now take an
988 ASYNC argument. If it is non-nil, package.el performs the download(s)
992 *** New variable 'package-menu-async' controls whether the
993 package-menu uses asynchronous downloads.
996 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
997 This follows the same rules as installing from a .tar file, except the
998 -pkg file is optional.
1001 *** Packages which are dependencies of other packages cannot be deleted.
1002 The FORCE argument to 'package-delete' overrides this.
1005 *** New custom variable 'package-selected-packages' tracks packages
1006 which were installed by the user (as opposed to installed as
1007 dependencies). This variable can also be manually customized.
1010 *** New command 'package-install-selected-packages' installs all
1011 packages from 'package-selected-packages' which are currently missing.
1014 *** 'package-install' function now takes a DONT-SELECT argument. If
1015 this function is called interactively or if DONT-SELECT is nil, add the
1016 package being installed to 'package-selected-packages'.
1019 *** New command 'package-autoremove' removes all packages which were
1020 installed strictly as dependencies but are no longer needed.
1025 When you invoke 'shell' interactively, the *shell* buffer will now
1026 display in a new window. However, you can customize this behavior via
1027 the 'display-buffer-alist' variable. For example, to get
1028 the old behavior -- *shell* buffer displays in current window -- use
1029 (add-to-list 'display-buffer-alist
1030 '("^\\*shell\\*$" . (display-buffer-same-window))).
1034 *** The ':protection' slot option is not obeyed any more.
1036 *** The 'newname' argument to constructors is optional&deprecated.
1037 If you need your objects to be named, do it by inheriting from 'eieio-named'.
1039 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
1041 *** The <class> variables are declared obsolete.
1043 *** The <initarg> variables are declared obsolete.
1045 *** defgeneric and defmethod are declared obsolete.
1046 Use the equivalent facilities from cl-generic.el instead.
1048 *** 'constructor' is now an obsolete alias for 'make-instance'.
1049 --- 'pcase' accepts a new UPattern 'eieio'.
1054 *** New command 'ido-bury-buffer-at-head' bound to C-S-b
1055 Bury the buffer at the head of 'ido-matches', analogous to how C-k
1056 kills the buffer at head.
1059 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
1060 meaning, and the list is restricted to those elements that do not
1061 match the current input.
1066 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
1067 The new commands 'next-line-or-history-element' and
1068 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
1069 minibuffer, allow by-line movement through minibuffer history,
1070 similarly to an ordinary buffer. Only when point moves over
1071 the bottom/top of the minibuffer it goes to the next/previous history
1072 element. 'M-p' and 'M-n' still move directly to previous/next history
1075 ** Search and Replace
1078 *** 'isearch' and 'query-replace' can now perform character folding in matches.
1079 This is analogous to case folding, but instead of disregarding case
1080 variants, it disregards wider classes of distinctions between similar
1081 characters. (Case folding is a special case of character folding.)
1082 This means many characters in the search string will match entire
1083 groups of characters instead of just themselves.
1085 For instance, the ASCII double quote character " will match all
1086 variants of double quotes, and the letter 'a' will match all of its
1087 accented cousins, even those composed of multiple characters, as well
1088 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
1091 Character folding is enabled by customizing 'search-default-mode' to
1092 the value 'character-fold-to-regexp'. You can also toggle character
1093 folding in the middle of a search by typing 'M-s ''.
1095 'query-replace' honors character folding if the new variable
1096 'replace-character-fold' is customized to a non-nil value.
1099 *** New user option 'search-default-mode'.
1100 This option specifies the default mode for Isearch. The default
1101 value, nil specifies that Isearch does literal searches (however,
1102 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
1103 as in previous Emacs versions).
1106 *** New function 'character-fold-to-regexp' can be used
1107 by searching commands to produce a regexp matching anything that
1108 character-folds into STRING.
1111 *** The new M-s M-w key binding uses eww to search the web for the
1112 text in the region. The search engine to use for this is specified by
1113 the customizable variable 'eww-search-prefix'.
1116 *** Query-replace history is enhanced.
1117 When query-replace reads the FROM string from the minibuffer, typing
1118 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
1119 and TO are the original text and its replacement, and SEP is an arrow
1120 string defined by the new variable 'query-replace-from-to-separator'.
1121 To select a prior replacement, type 'M-p' until the desired
1122 replacement appears in the minibuffer, and then exit the minibuffer by
1127 *** If 'quick-calc' is called with a prefix argument, insert the
1128 result of the calculation into the current buffer.
1131 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
1132 this you can tell Edebug not to stop at the start of the first
1133 instrumented function.
1138 *** New minor mode 'global-eldoc-mode'
1139 It is turned on by default, and affects '*scratch*' and other buffers
1140 whose major mode supports Emacs Lisp.
1143 *** 'eldoc-documentation-function' now defaults to 'ignore'
1146 *** 'describe-char-eldoc' displays information about character at point,
1147 and can be used as a default value of 'eldoc-documentation-function'. It is
1148 useful when, for example, one needs to distinguish various spaces - e.g.,
1149 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
1150 using mono-spaced font.
1155 *** HTML can now be rendered using variable-width fonts.
1158 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
1159 whether to use variable-pitch fonts or not. The user can also
1160 customize the 'shr-use-fonts' variable.
1163 *** A new command 'R' ('eww-readable') will try do identify the main
1164 textual parts of a web page and display only that, leaving menus and
1165 the like off the page.
1168 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
1169 toggle the paragraph direction between left-to-right and right-to-left.
1172 *** You can now use several eww buffers in parallel by renaming eww
1173 buffers you want to keep separate.
1176 *** Partial state of the eww buffers (the URIs and the titles of the
1177 pages visited) is now preserved in the desktop file.
1180 *** 'eww-after-render-hook' is now called after eww has rendered
1181 the data in the buffer.
1184 *** The 'eww-reload' command now takes a prefix to not reload via
1185 the net, but just use the local copy of the HTML.
1188 *** The DOM shr and eww uses has been changed to the general Emacs
1189 xml.el/libxml2 DOM, and a new package dom.el has been added to
1190 interact with this DOM. See the Emacs Lisp manual for interface
1194 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
1197 *** The new 'S' command will list all eww buffers, and allow managing
1201 *** https pages with valid certificates have headers marked in green, while
1202 invalid certificates are marked in red.
1207 *** text/html messages that contain inline image parts will be
1208 transformed into multipart/related messages before sending.
1211 ** In Show Paren Mode, a parenthesis can be highlighted when point
1212 stands inside it, and certain parens can be highlighted when point is
1213 at BOL or EOL, or in whitespace there. To enable these, customize,
1214 respectively, 'show-paren-when-point-inside-paren' or
1215 'show-paren-when-point-in-periphery'.
1218 ** If gpg2 exists on the system, it is now used as the default value
1219 of 'epg-gpg-program' (instead of gpg).
1224 *** Strings after ':documentation' are highlighted as docstrings.
1225 This enhances Lisp mode fontification to handle documentation of the
1226 form '(:documentation "the doc string")' used in Common Lisp code for
1227 CLOS class and slot documentation.
1229 ** Rectangle editing
1232 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
1235 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
1236 *** 'string-rectangle' provides on-the-fly preview of the result.
1239 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
1240 These should be used in preference to 'font-lock-fontify-buffer' when
1244 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
1245 to 'minibuffer-setup-hook'.
1247 If the first argument of the macro is of the form '(:append FUN)',
1248 then FUN will be appended to 'minibuffer-setup-hook', instead of
1253 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
1256 *** 'pcase' accepts the new UPattern 'cl-struct'.
1258 ** Calendar and diary
1261 *** The default 'diary-file' is now located in .emacs.d.
1264 *** New commands to insert diary entries with Chinese dates:
1265 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
1266 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
1269 *** The calendar can now list and mark diary entries with Chinese dates.
1270 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
1273 *** The option 'calendar-mode-line-format' can now be nil,
1274 which means to do nothing special with the mode line in calendars.
1277 *** New option 'calendar-weekend-days'.
1278 The option customizes which day headers receive the
1279 'calendar-weekend-header' face.
1282 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
1285 *** Many items obsolete since at least version 23.1 have been removed.
1286 The majority were function/variable/face aliases, too numerous to list here.
1289 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
1290 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
1292 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
1294 **** Macro 'calendar-for-loop'.
1296 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
1298 **** The nil and list forms of 'diary-display-function'.
1301 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
1302 If the output of ERT tests in batch mode execution can be saved to a
1303 log file, then it can be passed as an argument to the above function
1304 to produce a neat summary.
1307 ** New js.el option 'js-indent-first-init'.
1312 ** Info mode now displays symbol names in fixed-pitch font.
1313 If you want to get the old behavior back, customize the 'Info-quoted'
1314 face to use the same definitions as the default face.
1317 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
1320 *** 'info-display-manual' can now be given a prefix argument which (any
1321 non-nil value) directs the command to limit the completion
1322 alternatives to currently visited manuals.
1325 ** ntlm.el has support for NTLM2.
1330 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
1331 to delete or undelete multiple messages.
1334 *** Rmail can now render HTML mail messages if your Emacs was built with
1335 libxml2 or if you have the Lynx browser installed. By default, Rmail
1336 will display the HTML version of a mail message that has both HTML and
1337 plain text parts, if display of HTML email is possible; customize the
1338 'rmail-mime-prefer-html' option to 'nil' if you don't want that.
1341 *** In the commands that make summaries by subject, recipients, or senders,
1342 you can no longer use commas to separate regular expressions.
1345 ** SES now supports local printer functions; see 'ses-define-local-printer'.
1347 ** Shell-script Mode
1349 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
1350 specify the type of shell in use (bash, csh, etc).
1353 *** New value 'always' for 'sh-indent-after-continuation'.
1354 This provides old-style ("dumb") indentation of continued lines.
1355 See the doc string of 'sh-indent-after-continuation' for details.
1359 *** Fatal TLS errors are now silent by default.
1362 *** If Emacs isn't built with TLS support, an external TLS-capable
1363 program is used instead. This program used to be run in --insecure
1364 mode by default, but has now changed to be secure instead, and will
1365 fail if you try to connect to non-verifiable hosts. This is
1366 controlled by the 'tls-program' variable.
1371 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1372 When 'url-handler-mode' is enabled, file operations for these
1373 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1376 *** The URL package allows customizing the 'url-user-agent' string.
1377 The new 'url-user-agent' variable can be customized to be a string or
1381 *** The new interface variable 'url-request-noninteractive' can be used
1382 to specify that we're running in a noninteractive context, and that
1383 we should not be queried about things like TLS certificate validity.
1386 *** 'url-mime-accept-string' can now be used as in "interface"
1387 variable, meaning you can bind it around an 'url-retrieve' call.
1390 *** If URL is used with a https connection, the first callback argument
1391 plist will contain a :peer element that has the output of
1392 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
1397 *** New connection method "afp", which allows you to access Mac OS X
1398 volumes via the Apple Filing Protocol.
1401 *** New connection method "nc", which allows you to access dumb
1405 *** Method-specific parameters can be overwritten now with variable
1406 'tramp-connection-properties'.
1409 *** Handler for 'file-notify-valid-p' for remote machines that support
1410 filesystem notifications.
1415 *** New user variable 'sql-default-directory' enables remote
1416 connections using Tramp.
1419 *** New command 'sql-send-line-and-next'.
1420 This command, bound to 'C-c C-n' by default, sends the current line to
1421 the SQL process and advances to the next line, skipping whitespace and
1425 *** Added support for Vertica SQL.
1427 ** VC and related modes
1430 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
1431 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1432 (undocumented) command vc-hg-push now behaves slightly differently.
1435 *** The new command vc-region-history shows the log+diff of the active region.
1438 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
1439 This command is useful when you perform version control commands
1440 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1441 back-end for the buffer's file, or remove it from version control.
1444 *** New option 'vc-annotate-background-mode' controls whether
1445 the color range from 'vc-annotate-color-map' is applied to the
1446 background or to the foreground.
1449 *** New options for customizing encoding of Git commit log messages.
1450 The new user options 'vc-git-commits-coding-system' and
1451 'vc-git-log-output-coding-system' specify the encoding of log messages
1452 sent to Git when committing, and the decoding of log messages read
1453 from Git history commands. These options default to UTF-8; if
1454 customized, they should be consistent with the Git config variables
1455 i18n.commitEncoding and i18n.logOutputEncoding.
1456 ('vc-git-commits-coding-system' existed previously, but was a
1457 variable, not a user option.)
1460 *** 'compare-windows' now compares text with the most recently selected window
1461 instead of the next window. If you want the previous behavior of
1462 comparing with the next window, customize the new option
1463 'compare-windows-get-window-function' to the value
1464 'compare-windows-get-next-window'.
1467 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
1468 replace the face 'compare-windows', which is now an obsolete alias for
1469 'compare-windows-added'.
1472 *** The VC state indicator in the mode line now has different faces
1473 corresponding to each of the possible states. See the 'vc-faces'
1474 customization group.
1477 *** 'log-edit-insert-changelog' converts "(tiny change)" to
1478 "Copyright-paperwork-exempt: yes". Set 'log-edit-rewrite-tiny-change'
1479 nil to disable this.
1482 *** vc-mcvs.el has been removed.
1485 ** VHDL mode now supports VHDL'08.
1490 *** Decimal display mode uses "," groups, so it's more
1491 fitting for use in money calculations
1494 *** Factorial works with non-integer inputs.
1499 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1500 macro argument expansion, interactive macro evaluation and automatic
1501 scanning of #define'd symbols.
1504 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
1505 result of evaluating a macro.
1508 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
1509 all defined symbols in 'hide-ifdef-env'.
1512 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
1513 file name patterns. Defaults to files whose extension is one of '.h',
1514 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
1517 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
1518 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1519 (This could happen when an idempotent header file is visited again,
1520 when its guard symbol is already defined.) Defaults to 't'.
1523 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
1524 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1525 looking for macro definitions. By default, no symbols are ignored.
1530 *** New custom variable 'tex-print-file-extension' to help users who
1531 use PDF instead of DVI.
1534 *** TeX mode now supports Prettify Symbols mode. When enabling
1535 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1536 many other math macros are displayed using unicode characters.
1539 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
1540 By default, 32 consecutive spaces or four consecutive TABs are
1541 considered to be too deep, but the new variable
1542 'whitespace-big-indent-regexp' can be customized to change that.
1545 ** New options in 'tildify-mode'.
1546 New options 'tildify-space-string', 'tildify-pattern', and
1547 'tildify-foreach-region-function' variables make
1548 'tildify-string-alist', 'tildify-pattern-alist', and
1549 'tildify-ignored-environments-alist' variables (as well as a few
1550 helper functions) obsolete.
1553 ** New package Xref replaces Etags's front-end and UI
1555 The new package Xref provides a generic framework and new commands to
1556 find and move to definitions of functions, macros, data structures
1557 etc., as well as go back to the location where you were before moving
1558 to a definition. It supersedes and obsoletes many Etags commands,
1559 while still using the etags.el code that reads the TAGS tables as one
1562 The command 'xref-find-definitions' replaces 'find-tag' and provides
1563 an interface to pick one definition among several.
1564 'tags-loop-continue' is now unbound. 'xref-pop-marker-stack' replaces
1565 'pop-tag-mark', but has a keybinding ('M-,') different from the one
1566 'pop-tag-mark' used.
1568 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
1569 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
1570 'xref-find-apropos' replaces 'find-tag-regexp'.
1572 As a result of this, the following commands are now obsolete:
1573 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
1576 'tags-loop-continue' is not obsolete because it's still useful in
1577 'tags-search' and 'tags-query-replace', for which there are no direct
1581 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
1582 replaced by xref-style commands, see the "Dired" section below.
1587 'find-tag-marker-ring-length' is now an obsolete alias for
1588 'xref-marker-ring-length'. 'find-tag-marker-ring' is now an obsolete
1589 alias for a private variable. 'xref-push-marker-stack' and
1590 'xref-pop-marker-stack' should be used instead to manipulate the stack
1591 of searches for definitions.
1594 *** 'xref-find-definitions' and 'describe-function' now display
1595 information about mode local overrides (defined by cedet/mode-local.el
1596 'define-overloadable-function' 'define-mode-local-overrides').
1598 The framework's Lisp API is still experimental and can change in major,
1599 backward-incompatible ways.
1602 ** New package Project
1604 The new package Project provides generic infrastructure for dealing
1605 with projects. The main commands included in it are
1606 'project-find-file' and 'project-find-regexp'.
1608 The Lisp API of this package is still experimental.
1611 EUDC's LDAP backend has been improved.
1614 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1617 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1618 subprocess instead of on the command line.
1621 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1622 need to configure this manually anymore.
1625 *** The LDAP configuration section of EUDC's manual has been
1628 There have also been customization changes.
1631 *** New custom variable 'eudc-server-hotlist' to allow specifying
1632 multiple EUDC servers in init file.
1635 *** Custom variable 'eudc-inline-query-format' defaults to completing
1636 on email and firstname instead of surname.
1639 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
1640 to avoid interfering with the kill ring.
1643 *** Custom variable 'eudc-inline-expansion-format' defaults to
1644 "Firstname Surname <mail-address>".
1647 *** Custom variable 'eudc-options-file' defaults to
1648 "~/.emacs.d/eudc-options".
1651 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
1652 allow overriding the regular expression that recognizes the ldapsearch
1653 command line's password prompt.
1656 EUDC's BBDB backend now supports BBDB 3.
1659 EUDC's PH backend (eudcb-ph.el) is obsolete.
1664 *** The new built-in command 'clear' can scroll window contents out of sight.
1665 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1668 *** New buffer syntax '#<buffer-name>', which is equivalent to
1669 '#<buffer buffer-name>'. This shorthand makes interacting with
1670 buffers from eshell more convenient. Custom variable
1671 'eshell-buffer-shorthand', which has been broken for a while, has been
1675 *** By default, eshell "visual" program buffers (created by
1676 'eshell-visual-commands' and similar custom vars) are no longer killed
1677 when their processes die. This fixes issues with short-lived commands
1678 and makes visual programs more useful in general. For example, if
1679 "git log" is a visual command, it will always show the visual command
1680 buffer, even if the "git log" process dies. For the old behavior,
1681 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
1686 *** Support for the Google Chrome web browser.
1689 *** Support for the Conkeror web browser.
1692 *** Support for several ancient browsers is now officially obsolete.
1695 ** tar-mode: new 'tar-new-entry' command, allowing for new members to
1696 be added to the archive.
1701 *** Dired buffers are also auto-reverted via file notifications, if
1702 Emacs is compiled with file notification support.
1705 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
1706 See <http://debbugs.gnu.org/22814>.
1708 ** File Notifications
1711 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1714 *** The new event 'stopped' signals, that a file notification watch is
1715 not active any longer.
1718 *** The new function 'file-notify-valid-p' checks, whether a file
1719 notification descriptor still corresponds to an activate watch.
1724 *** The command 'dired-do-compress' bound to 'Z' now can compress
1725 directories and decompress zip files.
1728 *** New command 'dired-do-compress-to' bound to 'c' can be used to
1729 compress many marked files into a single named archive. The
1730 compression command is determined from the new
1731 'dired-compress-files-alist' variable.
1734 *** New user interface for the 'A' and 'Q' commands.
1735 These keys, now bound to 'dired-do-find-regexp' and
1736 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
1737 and 'xref-query-replace-in-results': they present the matches
1738 in the '*xref*' buffer and let you move through the matches. No need
1739 to use 'tags-loop-continue' to resume the search or replace loop. The
1740 previous commands, 'dired-do-search' and
1741 'dired-do-query-replace-regexp', are still available, but not bound to
1742 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
1743 back. We intend to obsolete the old commands in a future release.
1745 ** Tabulated List Mode
1748 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
1749 call 'tabulated-list-init-header', in which case it will have no
1753 *** 'tabulated-list-print' takes a second optional argument, update,
1754 which specifies an alternative printing method which is faster when
1755 few or no entries have changed.
1757 ** Obsolete packages
1763 *** landmark.el (moved to elpa.gnu.org)
1766 * New Modes and Packages in Emacs 25.1
1769 ** pinentry.el allows GnuPG passphrase to be prompted through the
1770 minibuffer instead of a graphical dialog, depending on whether the gpg
1771 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1772 is set). This feature requires newer versions of GnuPG (2.1.5 or
1773 later) and Pinentry (0.9.5 or later). To use this feature, add
1774 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1775 configuration with "gpgconf --reload gpg-agent".
1778 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1779 The main entry points are 'cl-defgeneric' and 'cl-defmethod'. See the
1780 node "Generic Functions" in the Emacs Lisp manual for more details.
1783 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1784 SCSS (Sassy CSS) files.
1787 ** let-alist is a new macro (and a package) that allows one to easily
1788 let-bind the values stored in an alist.
1791 ** 'tildify-mode' allows automatic insertion of hard spaces as one
1792 types the text. Breaking line after a single-character words is
1793 forbidden by Czech and Polish typography (and may be discouraged in
1794 other languages), so 'auto-tildify-mode' makes it easier to create
1795 a typographically-correct documents.
1798 ** The 'seq' library adds sequence manipulation functions and macros
1799 that complement basic functions provided by subr.el. All functions
1800 are prefixed with 'seq-' and work on lists, strings and vectors.
1801 'pcase' accepts a new Upattern 'seq'.
1804 ** The 'map' library provides map-manipulation functions that work on
1805 alists, hash-table and arrays. All functions are prefixed with
1806 'map-'. 'pcase' accepts a new UPattern 'map'.
1809 ** The 'thunk' library provides functions and macros to control the
1810 evaluation of forms.
1813 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1814 support for JSX, an XML-like syntax extension to ECMAScript.
1817 * Incompatible Lisp Changes in Emacs 25.1
1820 ** 'setq' and 'setf' must now be called with an even number of
1821 arguments. The earlier behavior of silently supplying a nil to the
1822 last variable when there was an odd number of arguments has been
1826 ** 'syntax-begin-function' is declared obsolete.
1827 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1828 slot in font-lock-defaults.
1831 ** The new implementation of Subword mode affects word movement everywhere.
1832 When Subword mode is turned on, 'forward-word', 'backward-word', and
1833 everything that uses them will move by sub-words, effectively
1834 overriding the buffer's syntax table. Lisp programs that shouldn't be
1835 affected by Subword mode should call the new functions
1836 'forward-word-strictly' and 'backward-word-strictly' instead.
1839 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
1840 called during startup. Users who call this function in their init
1841 file and still expect it to be run after startup should set
1842 'package-enable-at-startup' to t after the call to
1843 'package-initialize'.
1846 ** ':global' minor mode use 'setq-default' rather than 'setq'.
1847 This means that you can't use 'make-local-variable' and expect them to
1848 "magically" become buffer-local.
1851 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
1852 The 'track-mouse' form no longer refrains from changing the shape of
1853 the mouse pointer for the entire time the body of that form is
1854 executed. Lisp programs that use 'track-mouse' for dragging across
1855 large portions of the Emacs display, and want to avoid changes in the
1856 pointer shape during dragging, should bind the variable 'track-mouse'
1857 to the special value 'dragging' in the body of the form.
1860 ** The optional 'predicate' argument of 'lisp-complete-symbol' no longer
1861 has any effect. (This change was made in Emacs 24.4 but was not
1862 advertised at the time.)
1865 ** 'indirect-function' does not signal 'void-function' any more.
1866 This is mostly a bug-fix, since this change was missed back in 24.4 when
1867 symbol-function was changed not to signal 'void-function' any more.
1870 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
1873 ** M-x shell and M-x compile no longer set the EMACS environment variable.
1874 This avoids clashing when other programs use the variable for other purposes.
1875 Although M-x term still sets EMACS for compatibility with Bash 4.3 and earlier,
1876 this is deprecated and will be phased out when Bash 4.4 or later takes over.
1877 Use the INSIDE_EMACS environment variable instead.
1880 ** 'save-excursion' does not save&restore the mark any more.
1881 Use 'save-mark-and-excursion' if you want the old behavior.
1884 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
1885 argument ('predicate').
1888 ** 'completion-table-dynamic' by default stays in the minibuffer.
1889 The minibuffer will be the current buffer when the function is called.
1890 If you want the old behavior of calling the function in the buffer
1891 from which the minibuffer was entered, use the new argument
1892 'switch-buffer' to 'completion-table-dynamic'.
1895 ** window-configurations no longer record the buffers' marks.
1898 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1899 active region handling.
1902 ** deactivate-mark is now buffer-local.
1905 ** 'cl-the' now asserts that its argument is of the given type.
1908 ** 'process-running-child-p' may now return a numeric process
1909 group ID instead of 't'.
1912 ** Mouse click events on mode line or header line no longer include
1913 any reference to a buffer position. The 6th member of the mouse
1914 position list returned for such events is now nil.
1917 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1918 These slots used to hold key-shortcut data, but have been obsolete since
1922 ** Emacs no longer downcases the first letter of a system diagnostic
1923 when signaling a file error. For example, it now reports "Permission
1924 denied" instead of "permission denied". The old behavior was problematic
1925 in languages like German where downcasing rules depend on grammar.
1928 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
1929 Set it to 'curve' for curved single quotes, to 'straight' for straight
1930 apostrophes, and to 'grave' for grave accent and apostrophe. The
1931 default value nil acts like 'curve' if curved single quotes are
1932 displayable, and like 'grave' otherwise. The new variable affects
1933 display of diagnostics and help, but not of info. As the variable is
1934 not intended for casual use, it is not a user option.
1937 ** Message-issuing functions like 'message' and 'error' now translate
1938 various sorts of single quotes in their format strings according to
1939 the value of 'text-quoting-style' (see above). This translation
1940 cannot be disabled. To get the old behavior, use 'format', which is
1941 not affected by 'text-quoting-style', e.g., (message "%s" (format
1945 ** substitute-command-keys now replaces quotes.
1946 That is, it converts documentation strings' quoting style as per the
1947 value of 'text-quoting-style'. Doc strings in source code can use
1948 either curved single quotes or grave accents and apostrophes. As
1949 before, characters preceded by \= are output as-is.
1952 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1953 now match multibyte characters using Unicode character properties.
1954 If you want the old behavior where they matched any character with
1955 word syntax, use '\sw' instead.
1958 ** The character classes [:graph:] and [:print:] in regular expressions
1959 no longer match every multibyte character. Instead, Emacs now
1960 consults the Unicode character properties to determine which
1961 characters are graphic or printable. In particular, surrogates and
1962 unassigned codepoints are now rejected. If you want the old behavior,
1963 use [:multibyte:] instead.
1966 ** The 'diff' command uses the unified format now. To restore the old
1967 behavior, set 'diff-switches' to '-c'.
1970 ** 'grep-template' and 'grep-find-template' values don't include the
1971 --color argument anymore. It's added at the <C> place holder position
1972 dynamically. Any third-party code that changes these templates should
1973 be updated accordingly.
1976 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
1977 The new behavior is compatible with Common Lisp and with XEmacs.
1978 This change does not affect Lisp code intended to be portable to
1979 Emacs 24.2 and earlier, which did not support unary '/'.
1982 ** The 'default-directory' value doesn't have to end slash. To make
1983 that happen, 'unhandled-file-name-directory' now defaults to calling
1984 'file-name-as-directory'.
1987 * Lisp Changes in Emacs 25.1
1991 *** New UPatterns 'quote', 'app'.
1993 *** New UPatterns can be defined with 'pcase-defmacro'.
1995 *** New vector QPattern.
1998 ** syntax-propertize is now automatically called on-demand during forward
1999 parsing functions like 'forward-sexp'.
2002 ** New hooks 'prefix-command-echo-keystrokes-functions' and
2003 'prefix-command-preserve-state-hook' allow the definition of prefix
2004 commands other than the predefined 'C-u'.
2007 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
2008 These allow conversion between buffer positions and the corresponding
2009 file byte offsets, given the file's encoding.
2012 ** The default value of 'load-read-function' is now 'read'.
2013 Previously, the default value of 'nil' implied using 'read'.
2016 ** New hook 'pre-redisplay-functions'.
2017 It is a bit easier to use than 'pre-redisplay-function'.
2020 ** The second arg of 'looking-back' should always be provided explicitly.
2021 Previously, it was an optional argument, now it's mandatory.
2024 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
2025 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
2026 implemented by the new 'cursor-intangible-mode' and
2027 'cursor-sensor-mode' minor modes.
2030 ** 'inhibit-point-motion-hooks' now defaults to 't' and is obsolete.
2031 Use the new minor modes 'cursor-intangible-mode' and
2032 'cursor-sensor-mode' instead.
2035 ** New process type 'pipe', which can be used in combination with the
2036 ':stderr' keyword of make-process to handle standard error output
2040 ** New function 'make-process' provides an alternative interface to
2041 'start-process'. It allows programs to set process parameters such as
2042 process filter, sentinel, etc., through keyword arguments (similar to
2043 'make-network-process').
2046 ** A new function 'directory-files-recursively' returns all matching
2047 files (recursively) under a directory.
2050 ** New variable 'inhibit-message', when bound to non-nil, inhibits
2051 'message' and related functions from displaying messages in the echo
2052 area. The output is still logged to the *Messages* buffer.
2055 ** A new text property 'inhibit-read-only' can be used in read-only
2056 buffers to allow certain parts of the text to be writable.
2059 ** A new variable 'comment-end-can-be-escaped' is useful in languages
2060 such as C and C++ where line comments with escaped newlines are
2061 continued to the next line.
2064 ** New macro 'define-advice'.
2067 ** Emacs Lisp now supports generators.
2068 See the "Generators" section of the ELisp manual for the details.
2071 ** New finalizer facility for running code when objects become unreachable.
2072 See the "Finalizer Type" subsection in the ELisp manual for the
2076 ** lexical closures can use (:documentation FORM) to build their docstring.
2077 It should be placed right where the docstring would be, and FORM is then
2078 evaluated (and should return a string) when the closure is built.
2081 ** define-inline provides a new way to define inlinable functions.
2084 ** New function 'macroexpand-1' to perform a single step of macro expansion.
2087 ** Some "x-*" functions were obsoleted and/or renamed:
2088 *** x-select-text is renamed gui-select-text.
2089 *** x-selection-value is renamed gui-selection-value.
2090 *** x-get-selection is renamed gui-get-selection.
2091 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
2092 *** x-get-selection-value is renamed to gui-get-primary-selection.
2093 *** x-set-selection is renamed to gui-set-selection
2096 ** New function 'string-greaterp', which return the opposite result of
2100 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
2101 preserve the collation order as defined by the system's locale(1)
2102 environment. For the time being this is implemented for modern POSIX
2103 systems and for MS-Windows, for other systems they fall back to their
2104 counterparts 'string-lessp' and 'string-equal'.
2107 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
2108 The effect is that, on systems that use ls-lisp for Dired, the default
2109 sort order of the files in Dired is now different from what it was in
2110 previous versions of Emacs. In particular, the file names are sorted
2111 disregarding punctuation, accents, and diacritics, and letter case is
2112 ignored. For example, files whose name begin with a period will no
2113 longer appear near the beginning of the directory listing. If you
2114 want the old, locale-independent sorting, customize the new option
2115 'ls-lisp-use-string-collate' to the nil value.
2118 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
2119 if set to a non-nil value, causes the above 2 functions to ignore
2120 symbol and punctuation characters when collating strings. This
2121 emulates the behavior of modern Posix platforms when the locale's
2122 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
2123 MS-Windows doesn't support UTF-8 as codeset in its locales.
2126 ** New function 'alist-get', which is also a valid place (aka lvalue).
2129 ** New function 'funcall-interactively', which works like 'funcall'
2130 but makes 'called-interactively-p' treat the function as (you guessed it)
2131 called interactively.
2134 ** New function 'function-put' to use instead of 'put' for function properties.
2137 ** The new function 'bidi-find-overridden-directionality' allows you to
2138 find characters whose directionality was, perhaps maliciously,
2139 overridden by directional override control characters. Lisp programs
2140 can use this to detect potential phishing of URLs and other links that
2141 exploits bidirectional display reordering.
2144 ** The new function 'buffer-substring-with-bidi-context' allows you to
2145 copy a portion of a buffer into a different location while preserving
2146 the visual appearance both of the copied text and the text at
2147 destination, even when the copied text includes mixed bidirectional
2148 text and directional control characters.
2151 ** New properties that can be specified with 'declare':
2152 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
2153 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
2154 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
2158 ** New macro 'with-file-modes', for evaluating expressions with default file
2159 permissions set to temporary values (e.g., for creating private files).
2162 ** You can access the slots of structures using 'cl-struct-slot-value'.
2165 ** Function 'sort' can deal with vectors.
2168 ** Function 'system-name' now returns an updated value if the current
2169 system's name has changed or if the Emacs process has changed systems.
2170 To avoid long waits it no longer consults DNS to canonicalize the name
2171 (in some cases this may affect generated message-id headers - customize
2172 'message-user-fqdn' if this bothers you). The variable 'system-name'
2176 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
2179 ** If 'pwd' is called with a prefix argument, insert the current default
2183 ** New functions return extended information about fonts and faces.
2186 *** The function 'font-info' now returns more details about a font.
2187 In particular, it now returns the average width of the font's
2188 characters, which can be used for geometry-related calculations.
2191 *** A new function 'default-font-width' returns the average width of a
2192 character in the current buffer's default font. If the default face
2193 is remapped (see 'face-remapping-alist'), the value for the remapped
2194 face is returned. This function complements the existing function
2195 'default-font-height'.
2198 *** New functions 'window-font-height' and 'window-font-width' return
2199 the height and average width of characters in a specified face and
2200 window. If FACE is remapped (see 'face-remapping-alist'), the
2201 function returns the information for the remapped face.
2204 *** A new function 'window-max-chars-per-line' returns the maximal
2205 number of characters that can be displayed on one line. If a face
2206 and/or window are provided, these values are used for the
2207 calculation. This function is different from 'window-body-width' in
2208 that it accounts for (i) continuation glyphs, (ii) the size of the
2209 font, and (iii) the specified window.
2212 ** New utilities in subr-x.el:
2213 *** New macros 'if-let' and 'when-let' allow defining bindings and to
2214 execute code depending whether all values are true.
2215 *** New macros 'thread-first' and 'thread-last' allow threading a form
2216 as the first or last argument of subsequent forms.
2219 ** Documentation strings now support quoting with curved single quotes
2220 in addition to the old style with grave accent and apostrophe. The
2221 new style looks better on today's displays. In the new Electric Quote
2222 mode, you can enter curved single quotes into documentation by typing
2223 grave accent and apostrophe. Outside Electric Quote mode, you can
2224 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
2225 works) by typing 'A-[' and 'A-]'. As described above under
2226 'text-quoting-style', the user can specify how to display doc string
2230 ** New function 'format-message' is like 'format' and also converts
2231 curved single quotes, grave accents and apostrophes as per
2232 'text-quoting-style'.
2235 ** show-help-function's arg is converted via substitute-command-keys
2236 before being passed to the function. Help strings, help-echo
2237 properties, etc. can therefore contain command key escapes and
2241 ** Time-related changes:
2243 *** Time conversion functions now accept an optional ZONE argument
2244 that specifies the time zone rules for conversion. ZONE is omitted or
2245 nil for Emacs local time, t for Universal Time, 'wall' for system wall
2246 clock time, or a string as in the TZ environment variable. The
2247 affected functions are 'current-time-string', 'current-time-zone',
2248 'decode-time', and 'format-time-string'. The function 'encode-time',
2249 which already accepted a simple time zone rule argument, has been
2250 extended to accept all the new forms.
2252 *** Incompatible change in the third argument of 'format-time-string'.
2253 Previously, any non-nil argument was interpreted as specifying Universal Time.
2254 This is no longer true; packages that want Universal Time should pass t
2255 as the third argument.
2257 *** Time-related functions now consistently accept numbers
2258 (representing seconds since the epoch) and nil (representing the
2259 current time) as well as the usual list-of-integer representation.
2260 Affected functions include 'current-time-string', 'current-time-zone',
2261 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
2262 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
2263 'time-to-days', and 'time-to-seconds'.
2265 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
2268 *** 'calendar-next-time-zone-transition', 'time-add', and
2269 'time-subtract' no longer return time values in the obsolete and
2270 undocumented integer-pair format. Instead, they return a list of two
2274 ** New function 'set-binary-mode' allows switching a standard stream
2275 of the Emacs process to binary I/O mode.
2278 ** The new function 'directory-name-p' can be used to check whether a file
2279 name (as returned from, for instance, 'file-name-all-completions') is
2280 a directory file name. It returns non-nil if the last character in
2281 the name is a directory separator character (forward slash on GNU and
2282 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2285 ** ASCII approximations to curved quotes are put in standard-display-table
2286 if the terminal cannot display curved quotes.
2289 ** Standard output and error streams now transliterate characters via
2290 standard-display-table, and encode output using locale-coding-system.
2291 To force a specific encoding, bind 'coding-system-for-write' to the
2292 coding-system of your choice when invoking functions like 'prin1' and
2296 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
2299 ** New possible value for 'system-type': 'nacl'.
2300 This is used by Google's Native Client (NaCl).
2302 ** Miscellaneous name change
2305 For consistency with the usual Emacs spelling, the Lisp variable
2306 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
2307 The old name should still work, as an obsolescent alias.
2309 ** Changes in Frame- and Window- Handling
2312 *** Emacs can now draw horizontal scroll bars on some platforms that
2313 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2314 Horizontal scroll bars are turned off by default.
2316 **** New function 'horizontal-scroll-bars-available-p' telling whether
2317 horizontal scroll bars are available on the underlying system.
2319 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
2320 bars on all existing and future frames.
2322 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
2323 scroll bars on the selected frame.
2325 **** New frame parameters 'horizontal-scroll-bars' and
2326 'scroll-bar-height' to set horizontal scroll bars and their height
2327 for individual frames and in 'default-frame-alist'.
2329 **** New functions 'frame-scroll-bar-height' and
2330 'window-scroll-bar-height' return the height of horizontal scroll
2331 bars on a specific frame or window.
2333 **** 'set-window-scroll-bars' now accepts five parameters where the last
2334 two specify height and type of the window's horizontal scroll bar.
2336 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
2339 **** New buffer-local variables 'horizontal-scroll-bar' and
2340 'scroll-bar-height'.
2343 *** New functions 'frame-geometry' and 'frame-edges' give access to a
2347 *** New functions 'mouse-absolute-pixel-position' and
2348 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
2352 *** The function 'window-edges' now accepts three additional arguments to
2353 retrieve body, absolute and pixel edges of the window.
2356 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
2357 'window-inside-absolute-pixel-edges' have been renamed to respectively
2358 'window-body-edges', 'window-body-pixel-edges' and
2359 'window-absolute-body-pixel-edges'. The old names are kept as aliases.
2362 *** New function 'window-absolute-pixel-position' to get the screen
2363 coordinates of a visible buffer position.
2366 *** The height of a frame's menu and tool bar are no longer counted in the
2367 frame's text height. This means that the text height stands only for
2368 the height of the frame's root window plus that of the echo area (if
2369 present). This was already the behavior for frames with external tool
2370 and menu bars (like in the Gtk builds) but has now been extended to all
2374 *** Frames now do not necessarily preserve the number of columns or lines
2375 they display when setting default font, menu bar, fringe width, or
2376 scroll bars. In particular, maximized and fullscreen frames are
2377 conceptually never resized if such settings change. For fullheight and
2378 fullwidth frames, the behavior may depend on the toolkit used.
2379 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
2380 setting default font, menu bar, fringe width, or scroll bars of a
2381 specific frame does not resize that frame in order to preserve the
2382 number of columns or lines it displays.
2385 *** New function 'window-preserve-size' allows you to preserve the size of
2386 a window without "fixing" it. It's supported by 'fit-window-to-buffer',
2387 'temp-buffer-resize-mode' and 'display-buffer'.
2390 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
2391 This displays the buffer in an existing frame other than the current
2392 frame, and allows the caller to specify a frame predicate to exclude
2396 *** New minor mode 'window-divider-mode' and options
2397 'window-divider-default-places', 'window-divider-default-bottom-width'
2398 and 'window-divider-default-right-width'.
2401 *** The window displaying the '*Completions*' buffer with minibuffer
2402 completion candidates is now shown at the bottom of the selected
2403 frame. The size of that window is always as large as required to
2404 display all the candidates, except when limited by the minimum size
2405 of the other windows on that frame; those other windows are resized
2406 to provide space for the '*Completions*' display. The Emacs manual
2407 describes how to customize 'display-buffer-alist' to get back the old
2408 behavior, see the node "Temporary Displays" there.
2411 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2412 Those features have been deprecated in Gtk+ for a long time.
2417 *** etags no longer qualifies class members by default.
2419 By default, 'etags' will not qualify class members for Perl and C-like
2420 object-oriented languages with their class names and namespaces, and
2421 will remove qualifications used explicitly in the code from the tag
2422 names it puts in TAGS files. This is so the etags.el back-end for
2423 'xref-find-definitions' is more accurate and produces less false
2426 Use --class-qualify (-Q) if you want the old default behavior of
2427 qualifying class members in C++, Java, Objective C, and Perl. Note
2428 that using -Q might make some class members become "unknown" to 'M-.'
2429 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
2430 qualified names by hand.
2433 *** New language Ruby
2435 Names of modules, classes, methods, functions, and constants are
2436 tagged. Overloaded operators are also tagged.
2440 Names of packages, functions, and types are tagged.
2443 *** Improved support for Lua
2445 Etags now tags functions even if the "function" keyword follows some
2446 whitespace at line beginning.
2449 * Changes in Emacs 25.1 on Non-Free Operating Systems
2452 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2453 This includes the makefile.w32-in files in various subdirectories, and
2454 the support files. The file nt/configure.bat now just tells the user
2455 to use the procedure described in nt/INSTALL, by running the Posix
2456 'configure' script in the top-level directory.
2459 ** Building Emacs for MS-Windows requires at least Windows XP
2460 or Windows Server 2003. The built binaries still run on all versions
2461 of Windows starting with Windows 9X.
2464 ** Emacs running on MS-Windows now supports the daemon mode.
2467 ** The byte counts in etags-generated TAGS files are now the same on
2468 MS-Windows as they are on other platforms.
2471 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2472 Pass '--without-ns' to configure to create an X11 build, the old default.
2475 ** OS X 10.5 or older is no longer supported.
2478 ** OS X on PowerPC is no longer supported.
2481 ** New variable 'ns-use-fullscreen-animation' controls animation for
2482 non-native NS fullscreen. The default is nil. Set to t to enable
2483 animation when entering and leaving fullscreen. For native OSX fullscreen
2486 ** On the OS X Cocoa ("Nextstep") port, multicolor font (such as color
2487 emoji) display is disabled. This feature was accidentally added when
2488 Emacs 24.4 included the new Core Text based font backend code that was
2489 originally implemented for a non-mainline port. This will be enabled
2490 again once it is also implemented in Emacs on free operating systems.
2491 If some symbols, such as emoji, do not display, we suggest to install
2492 an appropriate font, such as Symbola; then they will be displayed,
2493 albeit without the color effects.
2496 ** The new function 'w32-application-type' returns the type of an
2497 MS-Windows application given the name of its executable program file.
2499 ** New variable 'w32-pipe-buffer-size'.
2500 It can be used to tune the size of the buffer of pipes created for
2501 communicating with subprocesses, when the program run by a subprocess
2502 exhibits unusual buffering behavior. Default is zero, which lets the
2503 OS use its default size.
2506 ----------------------------------------------------------------------
2507 This file is part of GNU Emacs.
2509 GNU Emacs is free software: you can redistribute it and/or modify
2510 it under the terms of the GNU General Public License as published by
2511 the Free Software Foundation, either version 3 of the License, or
2512 (at your option) any later version.
2514 GNU Emacs is distributed in the hope that it will be useful,
2515 but WITHOUT ANY WARRANTY; without even the implied warranty of
2516 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2517 GNU General Public License for more details.
2519 You should have received a copy of the GNU General Public License
2520 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2526 paragraph-separate: "[
\f]*$"