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 systems 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
735 *** 'C-x 8' now has shorthands for several chars, such as U+2010
736 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH). As
737 before, you can type 'C-x 8 C-h' to list shorthands.
740 *** New minor mode 'electric-quote-mode' for using curved quotes as you
741 type. See also the new variable 'text-quoting-style'.
744 ** New minor mode 'global-eldoc-mode' is enabled by default.
747 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
748 Bracketed paste mode causes text terminals to wrap pasted text in special
749 escape sequences that allow Emacs to tell the difference between text
750 you type and text you paste from other applications. Emacs then
751 avoids interpreting each character in the pasted text as it does with
752 keyboard input, which results in a paste experience similar to that
753 under a window system, and significant performance improvements when
754 pasting large amounts of text.
756 Bracketed paste mode is disabled by default, so Emacs automatically
757 enables it at startup if the terminal supports it.
760 ** Emacs now supports the latest version of the UBA.
761 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
762 was updated to support all the latest additions and changes introduced
763 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
764 This includes full support for directional isolates and the
765 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
769 ** You can access 'mouse-buffer-menu' ('C-down-mouse-1') using 'C-f10'.
772 ** New buffer-local 'electric-pair-local-mode'.
775 ** New variable 'fast-but-imprecise-scrolling' inhibits
776 fontification during full screen scrolling operations, giving less
777 hesitant operation during auto-repeat of 'C-v', 'M-v' at the cost of
778 possible inaccuracies in the end position.
781 ** New documentation command 'describe-symbol'.
782 Works for functions, variables, faces, etc. It is bound to 'C-h o' by
786 ** New function 'custom-prompt-customize-unsaved-options' checks for
787 unsaved customizations and prompts user to customize (if found). It
788 is intended for adding to 'kill-emacs-query-functions'.
791 ** The old 'C-x w' bindings in 'hi-lock-mode' are officially deprecated
792 in favor of the global 'M-s h' bindings introduced in Emacs 23.1.
793 They'll disappear soon.
796 * Changes in Specialized Modes and Packages in Emacs 25.1
801 *** New command 'checkdoc-package-keywords' checks if the
802 current package keywords are recognized. Set the new option
803 'checkdoc-package-keywords-flag' to non-nil to make
804 'checkdoc-current-buffer' call this function automatically.
807 *** New function 'checkdoc-file' checks for style errors.
808 It's meant for use together with 'compile':
809 emacs -batch --eval "(checkdoc-file \"subr.el\")"
814 *** The desktop format version has been upgraded from 206 to 208.
815 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
816 cannot read a version 208 desktop. To upgrade your desktop file, you
817 must explicitly request the upgrade, by 'C-u M-x desktop-save'. You are
818 recommended to do this as soon as you have firmly upgraded to Emacs
819 25.1 (or later). Should you ever need to downgrade your desktop file
820 to version 206, you can do this with 'C-u C-u M-x desktop-save'.
823 ** New function 'bookmark-set-no-overwrite' bound to 'C-x r M'.
824 It raises an error if a bookmark of that name already exists,
825 unlike 'bookmark-set' which silently updates an existing bookmark.
830 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
831 now control how mm-* functions fetch and display images in an HTML
832 message. Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
833 for that purpose, i.e., binds mm-html- variables with those gnus-
834 variables, but other packages do not have to bind gnus- variables now.
837 *** 'mm-inline-text-html-with-images' has been removed.
838 Use 'mm-html-inhibit-images' instead. Note that the value is opposite
844 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
845 GnuTLS encryption functions if possible.
850 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
851 the ordering of object keys by default.
854 *** New commands 'json-pretty-print-ordered' and
855 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
856 object keys sorted alphabetically.
858 ** Prettify Symbols mode
861 *** Prettify Symbols mode supports custom composition predicates. By
862 overriding the default 'prettify-symbols-compose-predicate', modes can
863 specify in which contexts a symbol may be displayed as some Unicode
864 character. 'prettify-symbols-default-compose-p' is the default which
865 is suitable for most programming languages such as C or Lisp (but not
869 *** Symbols can be unprettified while point is inside them.
870 New variable 'prettify-symbols-unprettify-at-point' configures this.
872 ** Enhanced xterm support
875 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
876 This variable tells Emacs which advanced capabilities are available in
877 the xterm terminal emulator used to display Emacs text-mode frames.
878 The default is to check each capability, and use it if available.
879 (This variable was introduced in Emacs 24.1, but was not announced in
883 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
884 in the surrounding GUI (using the OSC-52 escape sequence). This only works
885 if your xterm supports it and enables the 'allowWindowOps' options (disabled
886 by default at least in Debian, for security reasons).
888 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
889 escape sequence) if your xterm has the feature enabled but for that you
890 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
893 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
896 ** The way to turn on and off 'save-place' mode has changed.
897 It is no longer sufficient to load the saveplace library and set
898 'save-place' non-nil. Instead, use the two new minor modes:
899 'save-place-mode' turns on saving last place in every file, and
900 'save-place-local-mode' does that only for the file in whose buffer it
901 is invoked. The 'save-place' variable is now an obsolete alias for
902 'save-place-mode', which replaces it, and 'toggle-save-place' is an
903 obsolete alias for the new 'save-place-local-mode' command.
908 *** ERC can now hide message types by network or channel.
909 'erc-hide-list' will hide all messages of the specified type, while
910 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
911 specified message types for the respective specified targets.
914 *** Reconnection is now asynchronous.
917 *** Nick completion is now case-insensitive again after inadvertently
918 being made case-sensitive in Emacs 24.2.
923 *** New commands, key binds, and menu items.
925 **** '<' and '>' for navigating previous and next tracks in playlist
927 **** New play/pause command 'mpc-toggle-play' bound to 's'
929 **** 'g' bound to new command 'mpc-seek-current' will navigate current
932 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
933 toggling playback modes.
936 *** Now supports connecting to a UNIX domain socket.
939 *** Looks at more image file names to use as album art.
940 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
941 (XP) in addition to cover.jpg.
944 *** Searches in more locations for MPD configuration files.
945 MPD supports the XDG base directory specification since version 0.17.6.
950 *** 'midnight-mode' is now a proper minor mode.
953 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
958 *** New "external" package status.
959 An external package is any installed package that's not built-in and
960 not from 'package-user-dir', which usually means it's from an entry in
961 'package-directory-list'. They are treated much like built-in
962 packages, in that they cannot be deleted through the package menu and
963 are not considered for upgrades.
965 The effect is that a user can manually place a specific version of a
966 package inside 'package-directory-list' and the package menu will
970 *** If a package is available on multiple archives and one has higher
971 priority (as per 'package-archive-priorities') only that one is
972 listed. This can be configured with 'package-menu-hide-low-priority'.
975 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
976 This includes the above-mentioned low-priority packages, as well as
977 available packages whose version is lower than the currently installed
978 version (which were previously impossible to display).
979 This allows users to downgrade a package if a lower version is
983 *** When filtering the package menu, keywords starting with "arc:" or
984 "status:" represent package archive or status, respectively, instead
988 *** Most functions which involve downloading information now take an
989 ASYNC argument. If it is non-nil, package.el performs the download(s)
993 *** New variable 'package-menu-async' controls whether the
994 package-menu uses asynchronous downloads.
997 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
998 This follows the same rules as installing from a .tar file, except the
999 -pkg file is optional.
1002 *** Packages which are dependencies of other packages cannot be deleted.
1003 The FORCE argument to 'package-delete' overrides this.
1006 *** New custom variable 'package-selected-packages' tracks packages
1007 which were installed by the user (as opposed to installed as
1008 dependencies). This variable can also be manually customized.
1011 *** New command 'package-install-selected-packages' installs all
1012 packages from 'package-selected-packages' which are currently missing.
1015 *** 'package-install' function now takes a DONT-SELECT argument. If
1016 this function is called interactively or if DONT-SELECT is nil, add the
1017 package being installed to 'package-selected-packages'.
1020 *** New command 'package-autoremove' removes all packages which were
1021 installed strictly as dependencies but are no longer needed.
1026 When you invoke 'shell' interactively, the '*shell*' buffer will now
1027 display in a new window. However, you can customize this behavior via
1028 the 'display-buffer-alist' variable. For example, to get
1029 the old behavior -- '*shell*' buffer displays in current window -- use
1030 (add-to-list 'display-buffer-alist
1031 '("^\\*shell\\*$" . (display-buffer-same-window))).
1035 *** The ':protection' slot option is not obeyed any more.
1037 *** The 'newname' argument to constructors is optional&deprecated.
1038 If you need your objects to be named, do it by inheriting from 'eieio-named'.
1040 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
1042 *** The <class> variables are declared obsolete.
1044 *** The <initarg> variables are declared obsolete.
1046 *** defgeneric and defmethod are declared obsolete.
1047 Use the equivalent facilities from cl-generic.el instead.
1049 *** 'constructor' is now an obsolete alias for 'make-instance'.
1051 *** 'pcase' accepts a new UPattern 'eieio'.
1056 *** New command 'ido-bury-buffer-at-head' bound to 'C-S-b'.
1057 Bury the buffer at the head of 'ido-matches', analogous to how 'C-k'
1058 kills the buffer at head.
1061 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
1062 meaning, and the list is restricted to those elements that do not
1063 match the current input.
1068 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
1069 The new commands 'next-line-or-history-element' and
1070 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
1071 minibuffer, allow by-line movement through minibuffer history,
1072 similarly to an ordinary buffer. Only when point moves over
1073 the bottom/top of the minibuffer it goes to the next/previous history
1074 element. 'M-p' and 'M-n' still move directly to previous/next history
1077 ** Search and Replace
1080 *** 'isearch' and 'query-replace' can now perform character folding in matches.
1081 This is analogous to case folding, but instead of disregarding case
1082 variants, it disregards wider classes of distinctions between similar
1083 characters. (Case folding is a special case of character folding.)
1084 This means many characters in the search string will match entire
1085 groups of characters instead of just themselves.
1087 For instance, the ASCII double quote character " will match all
1088 variants of double quotes, and the letter 'a' will match all of its
1089 accented cousins, even those composed of multiple characters, as well
1090 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
1093 Character folding is enabled by customizing 'search-default-mode' to
1094 the value 'character-fold-to-regexp'. You can also toggle character
1095 folding in the middle of a search by typing 'M-s ''.
1097 'query-replace' honors character folding if the new variable
1098 'replace-character-fold' is customized to a non-nil value.
1101 *** New user option 'search-default-mode'.
1102 This option specifies the default mode for Isearch. The default
1103 value, nil specifies that Isearch does literal searches (however,
1104 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
1105 as in previous Emacs versions).
1108 *** New function 'character-fold-to-regexp' can be used
1109 by searching commands to produce a regexp matching anything that
1110 character-folds into STRING.
1113 *** The new 'M-s M-w' key binding uses eww to search the web for the
1114 text in the region. The search engine to use for this is specified by
1115 the customizable variable 'eww-search-prefix'.
1118 *** 'query-replace' history is enhanced.
1119 When 'query-replace' reads the FROM string from the minibuffer, typing
1120 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
1121 and TO are the original text and its replacement, and SEP is an arrow
1122 string defined by the new variable 'query-replace-from-to-separator'.
1123 To select a prior replacement, type 'M-p' until the desired
1124 replacement appears in the minibuffer, and then exit the minibuffer by
1129 *** If 'quick-calc' is called with a prefix argument, insert the
1130 result of the calculation into the current buffer.
1133 ** In Edebug, you can now set the initial mode with 'C-x C-a C-m'.
1134 With this you can tell Edebug not to stop at the start of the first
1135 instrumented function.
1140 *** New minor mode 'global-eldoc-mode'.
1141 It is turned on by default, and affects '*scratch*' and other buffers
1142 whose major mode supports Emacs Lisp.
1145 *** 'eldoc-documentation-function' now defaults to 'ignore'.
1148 *** 'describe-char-eldoc' displays information about character at point,
1149 and can be used as a default value of 'eldoc-documentation-function'. It is
1150 useful when, for example, one needs to distinguish various spaces - e.g.,
1151 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
1152 using mono-spaced font.
1157 *** HTML can now be rendered using variable-width fonts.
1160 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
1161 whether to use variable-pitch fonts or not. The user can also
1162 customize the 'shr-use-fonts' variable.
1165 *** A new command 'R' ('eww-readable') will try do identify the main
1166 textual parts of a web page and display only that, leaving menus and
1167 the like off the page.
1170 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
1171 toggle the paragraph direction between left-to-right and right-to-left.
1174 *** You can now use several eww buffers in parallel by renaming eww
1175 buffers you want to keep separate.
1178 *** Partial state of the eww buffers (the URIs and the titles of the
1179 pages visited) is now preserved in the desktop file.
1182 *** 'eww-after-render-hook' is now called after eww has rendered
1183 the data in the buffer.
1186 *** The 'eww-reload' command now takes a prefix to not reload via
1187 the net, but just use the local copy of the HTML.
1190 *** The DOM shr and eww uses has been changed to the general Emacs
1191 xml.el/libxml2 DOM, and a new package dom.el has been added to
1192 interact with this DOM. See the Emacs Lisp manual for interface
1196 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
1199 *** The new 'S' command will list all eww buffers, and allow managing
1203 *** https pages with valid certificates have headers marked in green, while
1204 invalid certificates are marked in red.
1209 *** text/html messages that contain inline image parts will be
1210 transformed into multipart/related messages before sending.
1213 ** In Show Paren Mode, a parenthesis can be highlighted when point
1214 stands inside it, and certain parens can be highlighted when point is
1215 at BOL or EOL, or in whitespace there. To enable these, customize,
1216 respectively, 'show-paren-when-point-inside-paren' or
1217 'show-paren-when-point-in-periphery'.
1220 ** If gpg2 exists on the system, it is now used as the default value
1221 of 'epg-gpg-program' (instead of gpg).
1226 *** Strings after ':documentation' are highlighted as docstrings.
1227 This enhances Lisp mode fontification to handle documentation of the
1228 form '(:documentation "the doc string")' used in Common Lisp code for
1229 CLOS class and slot documentation.
1231 ** Rectangle editing
1234 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
1237 *** 'C-x C-x' in 'rectangle-mark-mode' now cycles through the four corners.
1238 *** 'string-rectangle' provides on-the-fly preview of the result.
1241 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
1242 These should be used in preference to 'font-lock-fontify-buffer' when
1246 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
1247 to 'minibuffer-setup-hook'.
1249 If the first argument of the macro is of the form '(:append FUN)',
1250 then FUN will be appended to 'minibuffer-setup-hook', instead of
1255 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
1258 *** 'pcase' accepts the new UPattern 'cl-struct'.
1260 ** Calendar and diary
1263 *** The default 'diary-file' is now located in "~/.emacs.d".
1266 *** New commands to insert diary entries with Chinese dates:
1267 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
1268 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
1271 *** The calendar can now list and mark diary entries with Chinese dates.
1272 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
1275 *** The option 'calendar-mode-line-format' can now be nil,
1276 which means to do nothing special with the mode line in calendars.
1279 *** New option 'calendar-weekend-days'.
1280 The option customizes which day headers receive the
1281 'calendar-weekend-header' face.
1284 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
1287 *** Many items obsolete since at least version 23.1 have been removed.
1288 The majority were function/variable/face aliases, too numerous to list here.
1291 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
1292 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
1294 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
1296 **** Macro 'calendar-for-loop'.
1298 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
1300 **** The nil and list forms of 'diary-display-function'.
1303 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
1304 If the output of ERT tests in batch mode execution can be saved to a
1305 log file, then it can be passed as an argument to the above function
1306 to produce a neat summary.
1309 ** New js.el option 'js-indent-first-init'.
1314 ** Info mode now displays symbol names in fixed-pitch font.
1315 If you want to get the old behavior back, customize the 'Info-quoted'
1316 face to use the same definitions as the default face.
1319 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
1322 *** 'info-display-manual' can now be given a prefix argument which (any
1323 non-nil value) directs the command to limit the completion
1324 alternatives to currently visited manuals.
1327 ** ntlm.el has support for NTLM2.
1332 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
1333 to delete or undelete multiple messages.
1336 *** Rmail can now render HTML mail messages if your Emacs was built with
1337 libxml2 or if you have the Lynx browser installed. By default, Rmail
1338 will display the HTML version of a mail message that has both HTML and
1339 plain text parts, if display of HTML email is possible; customize the
1340 'rmail-mime-prefer-html' option to nil if you don't want that.
1343 *** In the commands that make summaries by subject, recipients, or senders,
1344 you can no longer use commas to separate regular expressions.
1347 ** SES now supports local printer functions; see 'ses-define-local-printer'.
1349 ** Shell-script Mode
1351 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
1352 specify the type of shell in use (bash, csh, etc).
1355 *** New value 'always' for 'sh-indent-after-continuation'.
1356 This provides old-style ("dumb") indentation of continued lines.
1357 See the doc string of 'sh-indent-after-continuation' for details.
1361 *** Fatal TLS errors are now silent by default.
1364 *** If Emacs isn't built with TLS support, an external TLS-capable
1365 program is used instead. This program used to be run in --insecure
1366 mode by default, but has now changed to be secure instead, and will
1367 fail if you try to connect to non-verifiable hosts. This is
1368 controlled by the 'tls-program' variable.
1373 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1374 When 'url-handler-mode' is enabled, file operations for these
1375 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1378 *** The URL package allows customizing the 'url-user-agent' string.
1379 The new 'url-user-agent' variable can be customized to be a string or
1383 *** The new interface variable 'url-request-noninteractive' can be used
1384 to specify that we're running in a noninteractive context, and that
1385 we should not be queried about things like TLS certificate validity.
1388 *** 'url-mime-accept-string' can now be used as in "interface"
1389 variable, meaning you can bind it around an 'url-retrieve' call.
1392 *** If URL is used with a https connection, the first callback argument
1393 PLIST will contain a :peer element that has the output of
1394 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
1399 *** New connection method "afp", which allows you to access Mac OS X
1400 volumes via the Apple Filing Protocol.
1403 *** New connection method "nc", which allows you to access dumb
1407 *** Method-specific parameters can be overwritten now with variable
1408 'tramp-connection-properties'.
1411 *** Handler for 'file-notify-valid-p' for remote machines that support
1412 filesystem notifications.
1417 *** New user variable 'sql-default-directory' enables remote
1418 connections using Tramp.
1421 *** New command 'sql-send-line-and-next'.
1422 This command, bound to 'C-c C-n' by default, sends the current line to
1423 the SQL process and advances to the next line, skipping whitespace and
1427 *** Added support for Vertica SQL.
1429 ** VC and related modes
1432 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
1433 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1434 (undocumented) command 'vc-hg-push' now behaves slightly differently.
1437 *** The new command 'vc-region-history' shows the log+diff of the active region.
1440 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
1441 This command is useful when you perform version control commands
1442 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1443 back-end for the buffer's file, or remove it from version control.
1446 *** New option 'vc-annotate-background-mode' controls whether
1447 the color range from 'vc-annotate-color-map' is applied to the
1448 background or to the foreground.
1451 *** New options for customizing encoding of Git commit log messages.
1452 The new user options 'vc-git-commits-coding-system' and
1453 'vc-git-log-output-coding-system' specify the encoding of log messages
1454 sent to Git when committing, and the decoding of log messages read
1455 from Git history commands. These options default to UTF-8; if
1456 customized, they should be consistent with the Git config variables
1457 i18n.commitEncoding and i18n.logOutputEncoding.
1458 ('vc-git-commits-coding-system' existed previously, but was a
1459 variable, not a user option.)
1462 *** 'compare-windows' now compares text with the most recently selected window
1463 instead of the next window. If you want the previous behavior of
1464 comparing with the next window, customize the new option
1465 'compare-windows-get-window-function' to the value
1466 'compare-windows-get-next-window'.
1469 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
1470 replace the face 'compare-windows', which is now an obsolete alias for
1471 'compare-windows-added'.
1474 *** The VC state indicator in the mode line now has different faces
1475 corresponding to each of the possible states. See the 'vc-faces'
1476 customization group.
1479 *** 'log-edit-insert-changelog' converts "(tiny change)" to
1480 "Copyright-paperwork-exempt: yes". Set 'log-edit-rewrite-tiny-change'
1481 nil to disable this.
1484 *** vc-mcvs.el has been removed.
1487 ** VHDL mode now supports VHDL'08.
1492 *** Decimal display mode uses "," groups, so it's more
1493 fitting for use in money calculations
1496 *** Factorial works with non-integer inputs.
1501 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1502 macro argument expansion, interactive macro evaluation and automatic
1503 scanning of #define'd symbols.
1506 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
1507 result of evaluating a macro.
1510 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
1511 all defined symbols in 'hide-ifdef-env'.
1514 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
1515 file name patterns. Defaults to files whose extension is one of '.h',
1516 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
1519 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
1520 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1521 (This could happen when an idempotent header file is visited again,
1522 when its guard symbol is already defined.) Defaults to t.
1525 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
1526 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1527 looking for macro definitions. By default, no symbols are ignored.
1532 *** New custom variable 'tex-print-file-extension' to help users who
1533 use PDF instead of DVI.
1536 *** TeX mode now supports Prettify Symbols mode. When enabling
1537 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1538 many other math macros are displayed using unicode characters.
1541 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
1542 By default, 32 consecutive spaces or four consecutive TABs are
1543 considered to be too deep, but the new variable
1544 'whitespace-big-indent-regexp' can be customized to change that.
1547 ** New options in 'tildify-mode'.
1548 New options 'tildify-space-string', 'tildify-pattern', and
1549 'tildify-foreach-region-function' variables make
1550 'tildify-string-alist', 'tildify-pattern-alist', and
1551 'tildify-ignored-environments-alist' variables (as well as a few
1552 helper functions) obsolete.
1555 ** New package Xref replaces Etags's front-end and UI.
1557 The new package Xref provides a generic framework and new commands to
1558 find and move to definitions of functions, macros, data structures
1559 etc., as well as go back to the location where you were before moving
1560 to a definition. It supersedes and obsoletes many Etags commands,
1561 while still using the etags.el code that reads the TAGS tables as one
1564 The command 'xref-find-definitions' replaces 'find-tag' and provides
1565 an interface to pick one definition among several.
1566 'tags-loop-continue' is now unbound. 'xref-pop-marker-stack' replaces
1567 'pop-tag-mark', but has a keybinding ('M-,') different from the one
1568 'pop-tag-mark' used.
1570 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
1571 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
1572 'xref-find-apropos' replaces 'find-tag-regexp'.
1574 As a result of this, the following commands are now obsolete:
1575 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
1578 'tags-loop-continue' is not obsolete because it's still useful in
1579 'tags-search' and 'tags-query-replace', for which there are no direct
1583 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
1584 replaced by xref-style commands, see the "Dired" section below.
1589 'find-tag-marker-ring-length' is now an obsolete alias for
1590 'xref-marker-ring-length'. 'find-tag-marker-ring' is now an obsolete
1591 alias for a private variable. 'xref-push-marker-stack' and
1592 'xref-pop-marker-stack' should be used instead to manipulate the stack
1593 of searches for definitions.
1596 *** 'xref-find-definitions' and 'describe-function' now display
1597 information about mode local overrides (defined by cedet/mode-local.el
1598 'define-overloadable-function' 'define-mode-local-overrides').
1600 The framework's Lisp API is still experimental and can change in major,
1601 backward-incompatible ways.
1604 ** New package Project
1606 The new package Project provides generic infrastructure for dealing
1607 with projects. The main commands included in it are
1608 'project-find-file' and 'project-find-regexp'.
1610 The Lisp API of this package is still experimental.
1613 EUDC's LDAP backend has been improved.
1616 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1619 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1620 subprocess instead of on the command line.
1623 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1624 need to configure this manually anymore.
1627 *** The LDAP configuration section of EUDC's manual has been
1630 There have also been customization changes.
1633 *** New custom variable 'eudc-server-hotlist' to allow specifying
1634 multiple EUDC servers in init file.
1637 *** Custom variable 'eudc-inline-query-format' defaults to completing
1638 on email and firstname instead of surname.
1641 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
1642 to avoid interfering with the kill ring.
1645 *** Custom variable 'eudc-inline-expansion-format' defaults to
1646 "Firstname Surname <mail-address>".
1649 *** Custom variable 'eudc-options-file' defaults to
1650 "~/.emacs.d/eudc-options".
1653 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
1654 allow overriding the regular expression that recognizes the ldapsearch
1655 command line's password prompt.
1658 EUDC's BBDB backend now supports BBDB 3.
1661 EUDC's PH backend (eudcb-ph.el) is obsolete.
1666 *** The new built-in command 'clear' can scroll window contents out of sight.
1667 If provided with an optional non-nil argument, the scrollback contents
1671 *** New buffer syntax '#<buffer-name>', which is equivalent to
1672 '#<buffer buffer-name>'. This shorthand makes interacting with
1673 buffers from eshell more convenient. Custom variable
1674 'eshell-buffer-shorthand', which has been broken for a while, has been
1678 *** By default, eshell "visual" program buffers (created by
1679 'eshell-visual-commands' and similar custom vars) are no longer killed
1680 when their processes die. This fixes issues with short-lived commands
1681 and makes visual programs more useful in general. For example, if
1682 "git log" is a visual command, it will always show the visual command
1683 buffer, even if the "git log" process dies. For the old behavior,
1684 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
1689 *** Support for the Google Chrome web browser.
1692 *** Support for the Conkeror web browser.
1695 *** Support for several ancient browsers is now officially obsolete.
1698 ** 'tar-mode': new 'tar-new-entry' command, allowing for new members to
1699 be added to the archive.
1704 *** Dired buffers are also auto-reverted via file notifications, if
1705 Emacs is compiled with file notification support.
1708 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
1709 See <http://debbugs.gnu.org/22814>.
1711 ** File Notifications
1714 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1717 *** The new event 'stopped' signals, that a file notification watch is
1718 not active any longer.
1721 *** The new function 'file-notify-valid-p' checks, whether a file
1722 notification descriptor still corresponds to an activate watch.
1727 *** The command 'dired-do-compress', bound to 'Z', now can compress
1728 directories and decompress zip files.
1731 *** New command 'dired-do-compress-to', bound to 'c', can be used to
1732 compress many marked files into a single named archive. The
1733 compression command is determined from the new
1734 'dired-compress-files-alist' variable.
1737 *** New user interface for the 'A' and 'Q' commands.
1738 These keys, now bound to 'dired-do-find-regexp' and
1739 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
1740 and 'xref-query-replace-in-results': they present the matches
1741 in the '*xref*' buffer and let you move through the matches. No need
1742 to use 'tags-loop-continue' to resume the search or replace loop. The
1743 previous commands, 'dired-do-search' and
1744 'dired-do-query-replace-regexp', are still available, but not bound to
1745 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
1746 back. We intend to obsolete the old commands in a future release.
1748 ** Tabulated List Mode
1751 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
1752 call 'tabulated-list-init-header', in which case it will have no
1756 *** 'tabulated-list-print' takes a second optional argument, UPDATE,
1757 which specifies an alternative printing method which is faster when
1758 few or no entries have changed.
1760 ** Obsolete packages
1766 *** landmark.el (moved to elpa.gnu.org)
1769 * New Modes and Packages in Emacs 25.1
1772 ** pinentry.el allows GnuPG passphrase to be prompted through the
1773 minibuffer instead of a graphical dialog, depending on whether the gpg
1774 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1775 is set). This feature requires newer versions of GnuPG (2.1.5 or
1776 later) and Pinentry (0.9.5 or later). To use this feature, add
1777 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1778 configuration with "gpgconf --reload gpg-agent".
1781 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1782 The main entry points are 'cl-defgeneric' and 'cl-defmethod'. See the
1783 node "Generic Functions" in the Emacs Lisp manual for more details.
1786 ** 'scss-mode' (a minor variant of 'css-mode') is a major mode for editing
1787 SCSS (Sassy CSS) files.
1790 ** 'let-alist' is a new macro (and a package) that allows one to easily
1791 let-bind the values stored in an alist.
1794 ** 'tildify-mode' allows automatic insertion of hard spaces as one
1795 types the text. Breaking line after a single-character words is
1796 forbidden by Czech and Polish typography (and may be discouraged in
1797 other languages), so 'auto-tildify-mode' makes it easier to create
1798 a typographically-correct documents.
1801 ** The 'seq' library adds sequence manipulation functions and macros
1802 that complement basic functions provided by subr.el. All functions
1803 are prefixed with 'seq-' and work on lists, strings and vectors.
1804 'pcase' accepts a new Upattern 'seq'.
1807 ** The 'map' library provides map-manipulation functions that work on
1808 alists, hash-table and arrays. All functions are prefixed with
1809 'map-'. 'pcase' accepts a new UPattern 'map'.
1812 ** The 'thunk' library provides functions and macros to control the
1813 evaluation of forms.
1816 ** 'js-jsx-mode' (a minor variant of 'js-mode') provides indentation
1817 support for JSX, an XML-like syntax extension to ECMAScript.
1820 * Incompatible Lisp Changes in Emacs 25.1
1823 ** 'setq' and 'setf' must now be called with an even number of
1824 arguments. The earlier behavior of silently supplying a nil to the
1825 last variable when there was an odd number of arguments has been
1829 ** 'syntax-begin-function' is declared obsolete.
1830 Removed 'font-lock-beginning-of-syntax-function' and the SYNTAX-BEGIN
1831 slot in 'font-lock-defaults'.
1834 ** The new implementation of Subword mode affects word movement everywhere.
1835 When Subword mode is turned on, 'forward-word', 'backward-word', and
1836 everything that uses them will move by sub-words, effectively
1837 overriding the buffer's syntax table. Lisp programs that shouldn't be
1838 affected by Subword mode should call the new functions
1839 'forward-word-strictly' and 'backward-word-strictly' instead.
1842 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
1843 called during startup. Users who call this function in their init
1844 file and still expect it to be run after startup should set
1845 'package-enable-at-startup' to t after the call to
1846 'package-initialize'.
1849 ** ':global' minor mode use 'setq-default' rather than 'setq'.
1850 This means that you can't use 'make-local-variable' and expect them to
1851 "magically" become buffer-local.
1854 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
1855 The 'track-mouse' form no longer refrains from changing the shape of
1856 the mouse pointer for the entire time the body of that form is
1857 executed. Lisp programs that use 'track-mouse' for dragging across
1858 large portions of the Emacs display, and want to avoid changes in the
1859 pointer shape during dragging, should bind the variable 'track-mouse'
1860 to the special value 'dragging' in the body of the form.
1863 ** The optional PREDICATE argument of 'lisp-complete-symbol' no longer
1864 has any effect. (This change was made in Emacs 24.4 but was not
1865 advertised at the time.)
1868 ** 'indirect-function' does not signal 'void-function' any more.
1869 This is mostly a bug-fix, since this change was missed back in 24.4 when
1870 'symbol-function' was changed not to signal 'void-function' any more.
1873 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
1876 ** 'M-x shell' and 'M-x compile' no longer set the EMACS environment variable.
1877 This avoids clashing when other programs use the variable for other purposes.
1878 Although 'M-x term' still sets EMACS for compatibility with Bash 4.3
1879 and earlier, this is deprecated and will be phased out when Bash 4.4
1880 or later takes over. Use the INSIDE_EMACS environment variable instead.
1883 ** 'save-excursion' does not save&restore the mark any more.
1884 Use 'save-mark-and-excursion' if you want the old behavior.
1887 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
1888 argument (PREDICATE).
1891 ** 'completion-table-dynamic' by default stays in the minibuffer.
1892 The minibuffer will be the current buffer when the function is called.
1893 If you want the old behavior of calling the function in the buffer
1894 from which the minibuffer was entered, use the new argument
1895 SWITCH-BUFFER to 'completion-table-dynamic'.
1898 ** window-configurations no longer record the buffers' marks.
1901 ** 'inhibit-modification-hooks' now also inhibits lock-file checks, as
1902 well as active region handling.
1905 ** 'deactivate-mark' is now buffer-local.
1908 ** 'cl-the' now asserts that its argument is of the given type.
1911 ** 'process-running-child-p' may now return a numeric process
1912 group ID instead of t.
1915 ** Mouse click events on mode line or header line no longer include
1916 any reference to a buffer position. The 6th member of the mouse
1917 position list returned for such events is now nil.
1920 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1921 These slots used to hold key-shortcut data, but have been obsolete since
1925 ** Emacs no longer downcases the first letter of a system diagnostic
1926 when signaling a file error. For example, it now reports "Permission
1927 denied" instead of "permission denied". The old behavior was problematic
1928 in languages like German where downcasing rules depend on grammar.
1931 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
1932 Set it to 'curve' for curved single quotes, to 'straight' for straight
1933 apostrophes, and to 'grave' for grave accent and apostrophe. The
1934 default value nil acts like 'curve' if curved single quotes are
1935 displayable, and like 'grave' otherwise. The new variable affects
1936 display of diagnostics and help, but not of info. As the variable is
1937 not intended for casual use, it is not a user option.
1940 ** Message-issuing functions like 'message' and 'error' now translate
1941 various sorts of single quotes in their format strings according to
1942 the value of 'text-quoting-style' (see above). This translation
1943 cannot be disabled. To get the old behavior, use 'format', which is
1944 not affected by 'text-quoting-style', e.g., (message "%s" (format
1948 ** 'substitute-command-keys' now replaces quotes.
1949 That is, it converts documentation strings' quoting style as per the
1950 value of 'text-quoting-style'. Doc strings in source code can use
1951 either curved single quotes or grave accents and apostrophes. As
1952 before, characters preceded by \= are output as-is.
1955 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1956 now match multibyte characters using Unicode character properties.
1957 If you want the old behavior where they matched any character with
1958 word syntax, use '\sw' instead.
1961 ** The character classes [:graph:] and [:print:] in regular expressions
1962 no longer match every multibyte character. Instead, Emacs now
1963 consults the Unicode character properties to determine which
1964 characters are graphic or printable. In particular, surrogates and
1965 unassigned codepoints are now rejected. If you want the old behavior,
1966 use [:multibyte:] instead.
1969 ** The 'diff' command uses the unified format now. To restore the old
1970 behavior, set 'diff-switches' to '-c'.
1973 ** 'grep-template' and 'grep-find-template' values don't include the
1974 --color argument anymore. It's added at the <C> place holder position
1975 dynamically. Any third-party code that changes these templates should
1976 be updated accordingly.
1979 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
1980 The new behavior is compatible with Common Lisp and with XEmacs.
1981 This change does not affect Lisp code intended to be portable to
1982 Emacs 24.2 and earlier, which did not support unary '/'.
1985 ** The 'default-directory' value doesn't have to end slash. To make
1986 that happen, 'unhandled-file-name-directory' now defaults to calling
1987 'file-name-as-directory'.
1990 * Lisp Changes in Emacs 25.1
1994 *** New UPatterns 'quote', 'app'.
1996 *** New UPatterns can be defined with 'pcase-defmacro'.
1998 *** New vector QPattern.
2001 ** 'syntax-propertize' is now automatically called on-demand during forward
2002 parsing functions like 'forward-sexp'.
2005 ** New hooks 'prefix-command-echo-keystrokes-functions' and
2006 'prefix-command-preserve-state-hook' allow the definition of prefix
2007 commands other than the predefined 'C-u'.
2010 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
2011 These allow conversion between buffer positions and the corresponding
2012 file byte offsets, given the file's encoding.
2015 ** The default value of 'load-read-function' is now 'read'.
2016 Previously, the default value of nil implied using 'read'.
2019 ** New hook 'pre-redisplay-functions'.
2020 It is a bit easier to use than 'pre-redisplay-function'.
2023 ** The second arg of 'looking-back' should always be provided explicitly.
2024 Previously, it was an optional argument, now it's mandatory.
2027 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
2028 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
2029 implemented by the new 'cursor-intangible-mode' and
2030 'cursor-sensor-mode' minor modes.
2033 ** 'inhibit-point-motion-hooks' now defaults to t and is obsolete.
2034 Use the new minor modes 'cursor-intangible-mode' and
2035 'cursor-sensor-mode' instead.
2038 ** New process type 'pipe', which can be used in combination with the
2039 ':stderr' keyword of 'make-process' to handle standard error output
2043 ** New function 'make-process' provides an alternative interface to
2044 'start-process'. It allows programs to set process parameters such as
2045 process filter, sentinel, etc., through keyword arguments (similar to
2046 'make-network-process').
2049 ** Subprocesses are automatically told about changes in window dimensions
2050 The new option 'window-adjust-process-window-size-function' controls
2051 how subprocesses are told to adapt their logical window sizes to
2052 changes in the Emacs window configuration. Its default value calls
2053 'set-process-window-size' with the smallest dimensions of all the
2054 windows that display the subprocess's buffer.
2057 ** A new function 'directory-files-recursively' returns all matching
2058 files (recursively) under a directory.
2061 ** New variable 'inhibit-message', when bound to non-nil, inhibits
2062 'message' and related functions from displaying messages in the echo
2063 area. The output is still logged to the '*Messages*' buffer.
2066 ** A new text property 'inhibit-read-only' can be used in read-only
2067 buffers to allow certain parts of the text to be writable.
2070 ** A new variable 'comment-end-can-be-escaped' is useful in languages
2071 such as C and C++ where line comments with escaped newlines are
2072 continued to the next line.
2075 ** New macro 'define-advice'.
2078 ** Emacs Lisp now supports generators.
2079 See the "Generators" section of the ELisp manual for the details.
2082 ** New finalizer facility for running code when objects become unreachable.
2083 See the "Finalizer Type" subsection in the ELisp manual for the
2087 ** Lexical closures can use '(:documentation FORM)' to build their docstring.
2088 It should be placed right where the docstring would be, and FORM is then
2089 evaluated (and should return a string) when the closure is built.
2092 ** 'define-inline' provides a new way to define inlinable functions.
2095 ** New function 'macroexpand-1' to perform a single step of macro expansion.
2098 ** Some "x-*" functions were obsoleted and/or renamed:
2099 *** 'x-select-text' is renamed 'gui-select-text'.
2100 *** 'x-selection-value' is renamed 'gui-selection-value'.
2101 *** 'x-get-selection' is renamed 'gui-get-selection'.
2102 *** 'x-get-clipboard' and 'x-clipboard-yank' are marked obsolete.
2103 *** 'x-get-selection-value' is renamed to 'gui-get-primary-selection'.
2104 *** 'x-set-selection' is renamed to 'gui-set-selection'.
2107 ** New function 'string-greaterp', which return the opposite result of
2111 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
2112 preserve the collation order as defined by the system's locale(1)
2113 environment. For the time being this is implemented for modern POSIX
2114 systems and for MS-Windows, for other systems they fall back to their
2115 counterparts 'string-lessp' and 'string-equal'.
2118 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
2119 The effect is that, on systems that use ls-lisp for Dired, the default
2120 sort order of the files in Dired is now different from what it was in
2121 previous versions of Emacs. In particular, the file names are sorted
2122 disregarding punctuation, accents, and diacritics, and letter case is
2123 ignored. For example, files whose name begin with a period will no
2124 longer appear near the beginning of the directory listing. If you
2125 want the old, locale-independent sorting, customize the new option
2126 'ls-lisp-use-string-collate' to the nil value.
2129 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
2130 if set to a non-nil value, causes the above 2 functions to ignore
2131 symbol and punctuation characters when collating strings. This
2132 emulates the behavior of modern Posix platforms when the locale's
2133 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
2134 MS-Windows doesn't support UTF-8 as codeset in its locales.
2137 ** New function 'alist-get', which is also a valid place (aka lvalue).
2140 ** New function 'funcall-interactively', which works like 'funcall'
2141 but makes 'called-interactively-p' treat the function as (you guessed it)
2142 called interactively.
2145 ** New function 'function-put' to use instead of 'put' for function properties.
2148 ** The new function 'bidi-find-overridden-directionality' allows you to
2149 find characters whose directionality was, perhaps maliciously,
2150 overridden by directional override control characters. Lisp programs
2151 can use this to detect potential phishing of URLs and other links that
2152 exploits bidirectional display reordering.
2155 ** The new function 'buffer-substring-with-bidi-context' allows you to
2156 copy a portion of a buffer into a different location while preserving
2157 the visual appearance both of the copied text and the text at
2158 destination, even when the copied text includes mixed bidirectional
2159 text and directional control characters.
2162 ** New properties that can be specified with 'declare':
2163 *** '(interactive-only INSTEAD)', says to use INSTEAD for non-interactive use.
2164 *** '(pure VAL)', if VAL is non-nil, indicates the function is pure.
2165 *** '(side-effect-free VAL)', if VAL is non-nil, indicates the function does not
2169 ** New macro 'with-file-modes', for evaluating expressions with default file
2170 permissions set to temporary values (e.g., for creating private files).
2173 ** You can access the slots of structures using 'cl-struct-slot-value'.
2176 ** Function 'sort' can deal with vectors.
2179 ** Function 'system-name' now returns an updated value if the current
2180 system's name has changed or if the Emacs process has changed systems.
2181 To avoid long waits it no longer consults DNS to canonicalize the name
2182 (in some cases this may affect generated message-id headers - customize
2183 'message-user-fqdn' if this bothers you). The variable 'system-name'
2187 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
2190 ** If 'pwd' is called with a prefix argument, insert the current default
2194 ** New functions return extended information about fonts and faces.
2197 *** The function 'font-info' now returns more details about a font.
2198 In particular, it now returns the average width of the font's
2199 characters, which can be used for geometry-related calculations.
2202 *** A new function 'default-font-width' returns the average width of a
2203 character in the current buffer's default font. If the default face
2204 is remapped (see 'face-remapping-alist'), the value for the remapped
2205 face is returned. This function complements the existing function
2206 'default-font-height'.
2209 *** New functions 'window-font-height' and 'window-font-width' return
2210 the height and average width of characters in a specified face and
2211 window. If FACE is remapped (see 'face-remapping-alist'), the
2212 function returns the information for the remapped face.
2215 *** A new function 'window-max-chars-per-line' returns the maximal
2216 number of characters that can be displayed on one line. If a face
2217 and/or window are provided, these values are used for the
2218 calculation. This function is different from 'window-body-width' in
2219 that it accounts for (i) continuation glyphs, (ii) the size of the
2220 font, and (iii) the specified window.
2223 ** New utilities in subr-x.el:
2225 *** New macros 'if-let' and 'when-let' allow defining bindings and to
2226 execute code depending whether all values are true.
2228 *** New macros 'thread-first' and 'thread-last' allow threading a form
2229 as the first or last argument of subsequent forms.
2232 ** Documentation strings now support quoting with curved single quotes
2233 in addition to the old style with grave accent and apostrophe. The
2234 new style looks better on today's displays. In the new Electric Quote
2235 mode, you can enter curved single quotes into documentation by typing
2236 grave accent and apostrophe. Outside Electric Quote mode, you can
2237 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
2238 works) by typing 'A-[' and 'A-]'. As described above under
2239 'text-quoting-style', the user can specify how to display doc string
2243 ** New function 'format-message' is like 'format' and also converts
2244 curved single quotes, grave accents and apostrophes as per
2245 'text-quoting-style'.
2248 ** 'show-help-function's arg is converted via 'substitute-command-keys'
2249 before being passed to the function. Help strings, help-echo
2250 properties, etc. can therefore contain command key escapes and
2254 ** Time-related changes:
2256 *** Time conversion functions now accept an optional ZONE argument
2257 that specifies the time zone rules for conversion. ZONE is omitted or
2258 nil for Emacs local time, t for Universal Time, 'wall' for system wall
2259 clock time, or a string as in the TZ environment variable. The
2260 affected functions are 'current-time-string', 'current-time-zone',
2261 'decode-time', and 'format-time-string'. The function 'encode-time',
2262 which already accepted a simple time zone rule argument, has been
2263 extended to accept all the new forms.
2265 *** Incompatible change in the third argument of 'format-time-string'.
2266 Previously, any non-nil argument was interpreted as specifying Universal Time.
2267 This is no longer true; packages that want Universal Time should pass t
2268 as the third argument.
2270 *** Time-related functions now consistently accept numbers
2271 (representing seconds since the epoch) and nil (representing the
2272 current time) as well as the usual list-of-integer representation.
2273 Affected functions include 'current-time-string', 'current-time-zone',
2274 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
2275 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
2276 'time-to-days', and 'time-to-seconds'.
2278 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
2281 *** 'calendar-next-time-zone-transition', 'time-add', and
2282 'time-subtract' no longer return time values in the obsolete and
2283 undocumented integer-pair format. Instead, they return a list of two
2287 ** New function 'set-binary-mode' allows switching a standard stream
2288 of the Emacs process to binary I/O mode.
2291 ** The new function 'directory-name-p' can be used to check whether a file
2292 name (as returned from, for instance, 'file-name-all-completions') is
2293 a directory file name. It returns non-nil if the last character in
2294 the name is a directory separator character (forward slash on GNU and
2295 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2298 ** ASCII approximations to curved quotes are put in 'standard-display-table'
2299 if the terminal cannot display curved quotes.
2302 ** Standard output and error streams now transliterate characters via
2303 'standard-display-table', and encode output using 'locale-coding-system'.
2304 To force a specific encoding, bind 'coding-system-for-write' to the
2305 coding-system of your choice when invoking functions like 'prin1' and
2309 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
2312 ** New possible value for 'system-type': 'nacl'.
2313 This is used by Google's Native Client (NaCl).
2315 ** Miscellaneous name change
2318 For consistency with the usual Emacs spelling, the Lisp variable
2319 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
2320 The old name should still work, as an obsolescent alias.
2322 ** Changes in Frame- and Window- Handling
2325 *** Emacs can now draw horizontal scroll bars on some platforms that
2326 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2327 Horizontal scroll bars are turned off by default.
2329 **** New function 'horizontal-scroll-bars-available-p' telling whether
2330 horizontal scroll bars are available on the underlying system.
2332 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
2333 bars on all existing and future frames.
2335 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
2336 scroll bars on the selected frame.
2338 **** New frame parameters 'horizontal-scroll-bars' and
2339 'scroll-bar-height' to set horizontal scroll bars and their height
2340 for individual frames and in 'default-frame-alist'.
2342 **** New functions 'frame-scroll-bar-height' and
2343 'window-scroll-bar-height' return the height of horizontal scroll
2344 bars on a specific frame or window.
2346 **** 'set-window-scroll-bars' now accepts five parameters where the last
2347 two specify height and type of the window's horizontal scroll bar.
2349 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
2352 **** New buffer-local variables 'horizontal-scroll-bar' and
2353 'scroll-bar-height'.
2356 *** New functions 'frame-geometry' and 'frame-edges' give access to a
2360 *** New functions 'mouse-absolute-pixel-position' and
2361 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
2365 *** The function 'window-edges' now accepts three additional arguments to
2366 retrieve body, absolute and pixel edges of the window.
2369 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
2370 'window-inside-absolute-pixel-edges' have been renamed to respectively
2371 'window-body-edges', 'window-body-pixel-edges' and
2372 'window-absolute-body-pixel-edges'. The old names are kept as aliases.
2375 *** New function 'window-absolute-pixel-position' to get the screen
2376 coordinates of a visible buffer position.
2379 *** The height of a frame's menu and tool bar are no longer counted in the
2380 frame's text height. This means that the text height stands only for
2381 the height of the frame's root window plus that of the echo area (if
2382 present). This was already the behavior for frames with external tool
2383 and menu bars (like in the Gtk builds) but has now been extended to all
2387 *** Frames now do not necessarily preserve the number of columns or lines
2388 they display when setting default font, menu bar, fringe width, or
2389 scroll bars. In particular, maximized and fullscreen frames are
2390 conceptually never resized if such settings change. For fullheight and
2391 fullwidth frames, the behavior may depend on the toolkit used.
2393 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
2394 setting default font, menu bar, fringe width, or scroll bars of a
2395 specific frame does not resize that frame in order to preserve the
2396 number of columns or lines it displays.
2399 *** New function 'window-preserve-size' allows you to preserve the size of
2400 a window without "fixing" it. It's supported by 'fit-window-to-buffer',
2401 'temp-buffer-resize-mode' and 'display-buffer'.
2404 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
2405 This displays the buffer in an existing frame other than the current
2406 frame, and allows the caller to specify a frame predicate to exclude
2410 *** New minor mode 'window-divider-mode' and options
2411 'window-divider-default-places', 'window-divider-default-bottom-width'
2412 and 'window-divider-default-right-width'.
2415 *** The window displaying the '*Completions*' buffer with minibuffer
2416 completion candidates is now shown at the bottom of the selected
2417 frame. The size of that window is always as large as required to
2418 display all the candidates, except when limited by the minimum size
2419 of the other windows on that frame; those other windows are resized
2420 to provide space for the '*Completions*' display. The Emacs manual
2421 describes how to customize 'display-buffer-alist' to get back the old
2422 behavior, see the node "Temporary Displays" there.
2425 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2426 Those features have been deprecated in Gtk+ for a long time.
2431 *** etags no longer qualifies class members by default.
2433 By default, 'etags' will not qualify class members for Perl and C-like
2434 object-oriented languages with their class names and namespaces, and
2435 will remove qualifications used explicitly in the code from the tag
2436 names it puts in TAGS files. This is so the etags.el back-end for
2437 'xref-find-definitions' is more accurate and produces less false
2440 Use --class-qualify (-Q) if you want the old default behavior of
2441 qualifying class members in C++, Java, Objective C, and Perl. Note
2442 that using -Q might make some class members become "unknown" to 'M-.'
2443 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
2444 qualified names by hand.
2447 *** New language Ruby
2449 Names of modules, classes, methods, functions, and constants are
2450 tagged. Overloaded operators are also tagged.
2454 Names of packages, functions, and types are tagged.
2457 *** Improved support for Lua
2459 Etags now tags functions even if the "function" keyword follows some
2460 whitespace at line beginning.
2463 * Changes in Emacs 25.1 on Non-Free Operating Systems
2466 ** MS-Windows specific Emacs build scripts are no longer in the distribution.
2467 This includes the makefile.w32-in files in various subdirectories, and
2468 the support files. The file nt/configure.bat now just tells the user
2469 to use the procedure described in nt/INSTALL, by running the Posix
2470 'configure' script in the top-level directory.
2473 ** Building Emacs for MS-Windows requires at least Windows XP
2474 or Windows Server 2003. The built binaries still run on all versions
2475 of Windows starting with Windows 9X.
2478 ** Emacs running on MS-Windows now supports the daemon mode.
2481 ** The byte counts in etags-generated TAGS files are now the same on
2482 MS-Windows as they are on other platforms.
2485 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2486 Pass '--without-ns' to configure to create an X11 build, the old default.
2489 ** OS X 10.5 or older is no longer supported.
2492 ** OS X on PowerPC is no longer supported.
2495 ** New variable 'ns-use-fullscreen-animation' controls animation for
2496 non-native NS fullscreen. The default is nil. Set to t to enable
2497 animation when entering and leaving fullscreen. For native OSX fullscreen
2500 ** On the OS X Cocoa ("Nextstep") port, multicolor font (such as color
2501 emoji) display is disabled. This feature was accidentally added when
2502 Emacs 24.4 included the new Core Text based font backend code that was
2503 originally implemented for a non-mainline port. This will be enabled
2504 again once it is also implemented in Emacs on free operating systems.
2505 If some symbols, such as emoji, do not display, we suggest to install
2506 an appropriate font, such as Symbola; then they will be displayed,
2507 albeit without the color effects.
2510 ** The new function 'w32-application-type' returns the type of an
2511 MS-Windows application given the name of its executable program file.
2513 ** New variable 'w32-pipe-buffer-size'.
2514 It can be used to tune the size of the buffer of pipes created for
2515 communicating with subprocesses, when the program run by a subprocess
2516 exhibits unusual buffering behavior. Default is zero, which lets the
2517 OS use its default size.
2520 ----------------------------------------------------------------------
2521 This file is part of GNU Emacs.
2523 GNU Emacs is free software: you can redistribute it and/or modify
2524 it under the terms of the GNU General Public License as published by
2525 the Free Software Foundation, either version 3 of the License, or
2526 (at your option) any later version.
2528 GNU Emacs is distributed in the hope that it will be useful,
2529 but WITHOUT ANY WARRANTY; without even the implied warranty of
2530 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2531 GNU General Public License for more details.
2533 You should have received a copy of the GNU General Public License
2534 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2540 paragraph-separate: "[
\f]*$"