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
29 ** New configure option ‘--disable-build-details’ attempts to build an
30 Emacs that is more likely to be reproducible; that is, if you build
31 and install Emacs twice, the second Emacs is a copy of the first.
32 Deterministic builds omit the build date from the output of the
33 emacs-version and erc-cmd-SV functions, and the leave the following
34 variables nil: emacs-build-system, emacs-build-time,
38 * Startup Changes in Emacs 25.2
41 * Changes in Emacs 25.2
44 ** A number of accessors for the value returned by `file-attributes'
45 has been added. They are: `file-attribute-type',
46 `file-attribute-link-number', `file-attribute-user-id',
47 `file-attribute-group-id', `file-attribute-access-time',
48 `file-attribute-modification-time',
49 `file-attribute-status-change-time', `file-attribute-size',
50 `file-attribute-modes', `file-attribute-inode-number', and
51 `file-attribute-device-number'
54 ** `align-regexp' has a separate history for its interactive argument
55 `align-regexp' no longer shares its history with all other
56 history-less functions that use `read-string'
59 ** The networking code has been reworked so that it's more
60 asynchronous than it was (when specifying :nowait t in
61 `make-network-process'). How asynchronous it is varies based on the
62 capabilities of the system, but on a typical GNU/Linux system the DNS
63 resolution, the connection, and (for TLS streams) the TLS negotiation
64 are all done without blocking the main Emacs thread. To get
65 asynchronous TLS, the TLS boot parameters have to be passed in (see
66 the manual for details).
68 Certain process oriented functions (like `process-datagram-address')
69 will block until socket setup has been performed. The recommended way
70 to deal with asynchronous sockets is to avoid interacting with them
71 until they have changed status to "run". This is most easily done
72 from a process sentinel.
74 ** `make-network-stream' has always allowed :service to be specified
75 as a "number string" (i.e., :service "993") when using gethostbyname,
76 but has required using a real number (i.e., :service 993) on systems
77 without gethostbyname. This difference has now been eliminated, and
78 you can use "number strings" on all systems.
80 ** It is possible to disable attempted recovery on fatal signals
82 Two new variables allow to disable attempts to recover from stack
83 overflow and to avoid automatic auto-save when Emacs is delivered a
84 fatal signal. `attempt-stack-overflow-recovery', if set to `nil',
85 will disable attempts to recover from C stack overflows; Emacs will
86 then crash as with any other fatal signal.
87 `attempt-orderly-shutdown-on-fatal-signal', if set to `nil', will
88 disable attempts to auto-save the session and shut down in an orderly
89 fashion when Emacs receives a fatal signal; instead, Emacs will
90 terminate immediately. Both variables are non-`nil' by default.
91 These variables are for users who would like to avoid the small
92 probability of data corruption due to techniques Emacs uses to recover
96 * Editing Changes in Emacs 25.2
99 * Changes in Specialized Modes and Packages in Emacs 25.2
104 *** A new `s' command for switching to another eww buffer via the minibuffer.
107 *** The `o' command (`shr-save-contents') has moved to `O' to avoid collision
108 with the `o' command from `image-map'.
111 ** The commands that add ChangeLog entries now prefer a VCS root directory
112 for the ChangeLog file, if none already exists. Customize
113 `change-log-directory-files' to nil for the old behavior.
116 ** Support for non-string values of `time-stamp-format' has been removed.
121 *** New connection method "sg", which allows to edit files under
125 *** New connection method "doas" for OpenBSD hosts.
128 ** `auto-revert-use-notify' is set back to t in `global-auto-revert-mode'.
131 * New Modes and Packages in Emacs 25.2
134 * Incompatible Lisp Changes in Emacs 25.2
137 ** Resizing a frame no longer runs `window-configuration-change-hook'.
138 Put your function on `window-size-change-functions' instead.
141 * Lisp Changes in Emacs 25.2
143 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
145 ** Autoload files can be generated without timestamps,
146 by setting `autoload-timestamps' to nil.
147 FIXME As an experiment, nil is the current default.
148 If no insurmountable problems before next release, it can stay that way.
150 ** `ert-with-function-mocked' of 'ert-x package allows mocking of functions
154 ** New functions `window-pixel-width-before-size-change' and
155 `window-pixel-height-before-size-change' allow to detect which window
156 changed size when `window-size-change-functions' are run.
159 * Changes in Emacs 25.2 on Non-Free Operating Systems
161 ** Intercepting hotkeys on Windows 7 and later now works better.
162 The new keyboard hooking code properly grabs system hotkeys such as
163 Win-* and Alt-TAB, in a way that Emacs can get at them before the
164 system. This makes the `w32-register-hot-key' functionality work
165 again on all versions of MS-Windows starting with Windows 7. On
166 Windows NT and later you can now register any hotkey combination. (On
167 Windows 9X, the previous limitations, spelled out in the Emacs manual,
171 * Installation Changes in Emacs 25.1
174 ** Building Emacs now requires C99 or later.
177 ** Building Emacs now requires GNU make, version 3.81 or later.
180 ** New configure option --with-cairo.
181 This builds Emacs with Cairo drawing. As a side effect, it provides
182 support for built-in printing, when Emacs was built with GTK+.
183 Cairo drawing is an experimental feature in Emacs, and subject to
184 change in future releases.
187 ** New configure option --with-modules.
188 This enables support for loading dynamic modules; see below.
191 ** By default, Emacs no longer works on IRIX. We expect that Emacs
192 users are not affected by this, as SGI stopped supporting IRIX in
193 December 2013. If you are affected, please send a bug report. You
194 should be able to work around the problem either by porting the Emacs
195 undumping code to GCC under IRIX, or by configuring --with-wide-int,
196 or by sticking with Emacs 24.4.
199 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
200 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
201 since Emacs 24.4, and the other variants were undocumented and were
202 obstacles to maintenance and development. GC_MARK_STACK and its
203 related symbols have been removed from the C internals.
206 ** 'configure' now prefers gnustep-config when configuring GNUstep.
207 If gnustep-config is not available, the old heuristics are used.
210 ** 'configure' now prefers inotify to gfile for file notification,
211 unless gfile is explicitly requested via --with-file-notification='gfile'.
214 ** 'configure' detects the kqueue file notification library on *BSD
215 and Mac OS X machines.
218 ** The configure option '--with-pkg-config-prog' has been removed.
219 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
222 ** The configure option '--with-mmdf' has been removed.
223 It was no longer useful, as it relied on libraries that are no longer
224 supported, and its presence led to confusion during configuration.
225 This affects only the 'movemail' utility; Emacs itself can still
226 process MMDF-format files as before.
229 ** The configure option '--enable-silent-rules' is now the default,
230 and silent rules are now quieter. To get the old behavior where
231 'make' chatters a lot, configure with '--disable-silent-rules' or
232 build with 'make V=1'.
235 ** The configure option '--with-gameuser' now allows you to specify a
236 group instead of a user if its argument is prefixed by ':' (a colon).
237 This will cause the game score files in ${localstatedir}/games/emacs
238 to be owned by that group, and the helper program for updating them to
239 be installed setgid. The option now defaults to the 'games' group.
242 ** The `grep-changelog' script (and its manual page) are no longer included.
243 It has no particular connection to Emacs and has not changed in years,
244 so if you want to use it, you can always take a copy from an older Emacs.
247 ** Emacs 25 comes with a new set of icons.
248 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
249 The old Emacs logo icons are available as `emacs23.png' in the same location.
252 ** New make target `check-expensive' to run additional tests.
253 This includes all tests which run via "make check", plus additional
254 tests which take more time to perform.
257 * Startup Changes in Emacs 25.1
260 ** When Emacs is given a file as a command line argument and
261 `initial-buffer-choice' is non-nil, display both the file and
262 `initial-buffer-choice'. When Emacs is given more than one file and
263 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
264 and *Buffer List*. This makes Emacs convenient to use from the
265 command line when `initial-buffer-choice' is non-nil.
268 ** The value of ‘initial-scratch-message’ is now treated as a doc string
269 and can contain escape sequences for command keys, quotes, and the like.
272 * Changes in Emacs 25.1
275 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
276 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
277 xwidget support, you can access the embedded webkit browser with `M-x
278 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
279 browser. The buffer will have a new mode, `xwidget-webkit-mode'
280 (similar to `image-mode'), which supports the webkit widget.
283 *** New functions for xwidget-webkit mode `xwidget-webkit-insert-string',
284 `xwidget-webkit-adjust-size-dispatch', `xwidget-webkit-back',
285 `xwidget-webkit-browse-url', `xwidget-webkit-reload',
286 `xwidget-webkit-current-url', `xwidget-webkit-scroll-backward',
287 `xwidget-webkit-scroll-forward', `xwidget-webkit-scroll-down',
288 `xwidget-webkit-scroll-up'.
291 ** Emacs can now load shared/dynamic libraries (modules).
292 A dynamic Emacs module is a shared library that provides additional
293 functionality for use in Emacs Lisp programs, just like a package
294 written in Emacs Lisp would. The functions `load', `require',
295 `load-file', etc. were extended to load such modules, as they do with
296 Emacs Lisp packages. The new variable `module-file-suffix' holds the
297 system-dependent value of the file-name extension (`.so' on Posix
298 hosts) of the module files.
300 A module should export a C-callable function named
301 `emacs_module_init', which Emacs will call as part of the call to
302 `load' or `require' which loads the module. It should also export a
303 symbol named `plugin_is_GPL_compatible' to indicate that its code is
304 released under the GPL or compatible license; Emacs will refuse to
305 load modules that don't export such a symbol.
307 If a module needs to call Emacs functions, it should do so through the
308 API defined and documented in the header file `emacs-module.h'. Note
309 that any module that provides Lisp-callable functions will have to use
310 Emacs functions such as `fset' and `funcall', in order to register its
311 functions with the Emacs Lisp interpreter.
313 Modules can create `user-ptr' Lisp objects that embed pointers to C
314 struct's defined by the module. This is useful for keeping around
315 complex data structures created by a module, to be passed back to the
316 module's functions. User-ptr objects can also have associated
317 "finalizers" -- functions to be run when the object is GC'ed; this is
318 useful for freeing any resources allocated for the underlying data
319 structure, such as memory, open file descriptors, etc. A new
320 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
323 Loadable modules in Emacs are an experimental feature, and subject to
324 change in future releases. For that reason, their support is disabled
325 by default, and must be enabled by using the `--with-modules' option
329 ** A second dir-local file (.dir-locals-2.el) is now accepted.
330 See the variable `dir-locals-file-2' for more information.
333 ** Network security (TLS/SSL certificate validity and the like) is
334 added via the new Network Security Manager (NSM) and controlled via
335 the `network-security-level' variable.
338 ** International domain names (IDNA) are now encoded via the new
339 puny.el library, so that one can visit web sites like
340 "http://méxico.icom.museum".
343 ** C-h l now also lists the commands that were run.
345 ** The new M-s M-w key binding uses eww to search the web for the
349 ** The new `timer-list' command lists all active timers in a buffer
350 where you can cancel them with the `c' command.
352 ** M-x suggests shorthands and ignores obsolete commands for completion.
353 ** x-select-enable-clipboard is renamed select-enable-clipboard.
354 x-select-enable-primary and renamed select-enable-primary.
355 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
356 name it), with the proviso that on some systems (e.g. Windows)
357 select-enable-primary is ineffective since the system doesn't
358 have the equivalent of a primary selection.
361 ** New option `switch-to-buffer-in-dedicated-window' allows you to
362 customize how `switch-to-buffer' proceeds interactively when the
363 selected window is strongly dedicated to its buffer.
366 ** The option `even-window-heights' has been renamed to
367 `even-window-sizes' and now handles window widths as well.
370 ** New function `read-multiple-choice' use to prompt for
371 multiple-choice questions, with a handy way to display help texts.
374 ** terpri gets an optional arg ENSURE to conditionally output a newline.
377 ** `insert-register' now leaves point after the inserted text
378 when called interactively. A prefix argument toggles this behavior.
381 ** The new variable `term-file-aliases' replaces some files from lisp/term.
382 The function `tty-run-terminal-initialization' consults this variable
383 when deciding what terminal-specific initialization code to run.
386 ** New variable `system-configuration-features', listing some of the
387 main features that Emacs was compiled with. This is mainly intended
388 for use in Emacs bug reports.
391 ** A password is now hidden also when typed in batch mode. Another
392 hiding character but the default `.' can be used by let-binding the
393 variable `read-hide-char'.
396 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
399 * Editing Changes in Emacs 25.1
402 ** M-x suggests shorthands and ignores obsolete commands for completion.
407 *** Successive single-char deletions are collapsed in the undo-log just like
408 successive char insertions. Which commands invoke this behavior is
409 controlled by the new `undo-auto-amalgamate' function. See the node
410 "Undo" in the ELisp manual for more details.
413 *** The heuristic used to insert `undo-boundary' after each command
414 has changed, so that if a command causes changes in more than just the
415 current buffer, Emacs now calls `undo-boundary' in every buffer
416 affected by the command.
419 ** New command `comment-line' bound to `C-x C-;'.
421 ** New and improved facilities for inserting Unicode characters
424 *** Unicode names entered via C-x 8 RET now use substring completion by default.
427 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
428 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
431 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
432 as you type. See also the new variable ‘text-quoting-style’.
435 ** New minor mode global-eldoc-mode is enabled by default.
438 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
439 Bracketed paste mode causes text terminals to wrap pasted text in special
440 escape sequences that allow Emacs to tell the difference between text
441 you type and text you paste from other applications. Emacs then
442 avoids interpreting each character in the pasted text as it does with
443 keyboard input, which results in a paste experience similar to that
444 under a window system, and significant performance improvements when
445 pasting large amounts of text.
447 Bracketed paste mode is disabled by default, so Emacs automatically
448 enables it at startup if the terminal supports it.
451 ** Emacs now supports the latest version of the UBA.
452 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
453 was updated to support all the latest additions and changes introduced
454 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
455 This includes full support for directional isolates and the
456 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
460 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
463 ** New buffer-local `electric-pair-local-mode'.
466 ** New variable `fast-but-imprecise-scrolling' inhibits
467 fontification during full screen scrolling operations, giving less
468 hesitant operation during auto-repeat of C-v, M-v at the cost of
469 possible inaccuracies in the end position.
472 ** New documentation command `describe-symbol'.
473 Works for functions, variables, faces, etc. It is bound to `C-h o' by
477 ** New function `custom-prompt-customize-unsaved-options' checks for
478 unsaved customizations and prompts user to customize (if found). It
479 is intended for adding to 'kill-emacs-query-functions'.
482 ** The old `C-x w' bindings in hi-lock-mode are officially deprecated
483 in favor of the global `M-s h' bindings introduced in Emacs-23.1.
484 They'll disappear soon.
487 ** New bindings for 'query-replace-map'.
488 `undo', undo the last replacement; bound to `u'.
489 `undo-all', undo all replacements; bound to `U'.
492 * Changes in Specialized Modes and Packages in Emacs 25.1
497 *** New command `checkdoc-package-keywords' checks if the
498 current package keywords are recognized. Set the new option
499 `checkdoc-package-keywords-flag' to non-nil to make
500 `checkdoc-current-buffer' call this function automatically.
503 *** New function `checkdoc-file' checks for style errors.
504 It's meant for use together with `compile':
505 emacs -batch --eval "(checkdoc-file \"subr.el\")"
510 *** The desktop format version has been upgraded from 206 to 208.
511 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
512 cannot read a version 208 desktop. To upgrade your desktop file, you
513 must explicitly request the upgrade, by C-u M-x desktop-save. You are
514 recommended to do this as soon as you have firmly upgraded to Emacs
515 25.1 (or later). Should you ever need to downgrade your desktop file
516 to version 206, you can do this with C-u C-u M-x desktop-save.
519 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
520 It raises an error if a bookmark of that name already exists,
521 unlike `bookmark-set' which silently updates an existing bookmark.
526 *** New user options `mm-html-inhibit-images' and `mm-html-blocked-images'
527 now control how mm-* functions fetch and display images in an HTML
528 message. Gnus still uses `gnus-inhibit-images' and `gnus-blocked-images'
529 for that purpose, i.e., binds mm-html- variables with those gnus-
530 variables, but other packages do not have to bind gnus- variables now.
533 *** `mm-inline-text-html-with-images' has been removed.
534 Use `mm-html-inhibit-images' instead. Note that the value is opposite
540 *** `imap-ssl-program' has been removed, and imap.el uses the internal
541 GnuTLS encryption functions if possible.
546 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
547 the ordering of object keys by default.
550 *** New commands `json-pretty-print-ordered' and
551 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
552 object keys sorted alphabetically.
555 ** Prog mode has some support for multi-mode indentation.
556 This allows better indentation support in modes that support multiple
557 programming languages in the same buffer, like literate programming
558 environments or ANTLR programs with embedded Python code.
560 A major mode can provide indentation context for a sub-mode through
561 the `prog-indentation-context' variable. To support this, modes that
562 provide indentation should use `prog-widen' instead of `widen' and
563 `prog-first-column' instead of a literal zero. See the node
564 "Mode-Specific Indent" in the ELisp manual for more details.
566 ** Prettify Symbols mode
569 *** Prettify Symbols mode supports custom composition predicates. By
570 overriding the default `prettify-symbols-compose-predicate', modes can
571 specify in which contexts a symbol may be displayed as some Unicode
572 character. `prettify-symbols-default-compose-p' is the default which
573 is suitable for most programming languages such as C or Lisp (but not
577 *** Symbols can be unprettified while point is inside them.
578 New variable `prettify-symbols-unprettify-at-point' configures this.
580 ** Enhanced xterm support
583 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
584 This variable tells Emacs which advanced capabilities are available in
585 the xterm terminal emulator used to display Emacs text-mode frames.
586 The default is to check each capability, and use it if available.
587 (This variable was introduced in Emacs 24.1, but was not announced in
591 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
592 in the surrounding GUI (using the OSC-52 escape sequence). This only works
593 if your xterm supports it and enables the `allowWindowOps' options (disabled
594 by default at least in Debian, for security reasons).
596 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
597 escape sequence) if your xterm has the feature enabled but for that you
598 additionally need to add `getSelection' to `xterm-extra-capabilities'.
601 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
604 ** The way to turn on and off `save-place' mode has changed.
605 It is no longer sufficient to load the saveplace library and set
606 `save-place' non-nil. Instead, use the two new minor modes:
607 `save-place-mode' turns on saving last place in every file, and
608 `save-place-local-mode' does that only for the file in whose buffer it
609 is invoked. The `save-place' variable is now an obsolete alias for
610 `save-place-mode', which replaces it, and `toggle-save-place' is an
611 obsolete alias for the new `save-place-local-mode' command.
616 *** ERC can now hide message types by network or channel.
617 `erc-hide-list' will hide all messages of the specified type, while
618 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
619 specified message types for the respective specified targets.
621 *** New variable `erc-default-port-tls' used to connect to TLS IRC
625 *** Reconnection is now asynchronous.
628 *** Nick completion is now case-insensitive again after inadvertently
629 being made case-sensitive in Emacs 24.2.
634 *** New commands, key binds, and menu items.
636 **** `<' and `>' for navigating previous and next tracks in playlist
638 **** New play/pause command `mpc-toggle-play' bound to `s'
640 **** `g' bound to new command `mpc-seek-current' will navigate current
643 **** New commands `mpc-toggle-{consume,repeat,single,shuffle}' for
644 toggling playback modes.
647 *** Now supports connecting to a UNIX domain socket.
650 *** Looks at more image file names to use as album art.
651 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
652 (XP) in addition to cover.jpg.
655 *** Searches in more locations for MPD configuration files.
656 MPD supports the XDG base directory specification since version 0.17.6.
661 *** `midnight-mode' is now a proper minor mode.
664 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
669 *** New "external" package status.
670 An external package is any installed package that's not built-in and
671 not from `package-user-dir', which usually means it's from an entry in
672 `package-directory-list'. They are treated much like built-in
673 packages, in that they cannot be deleted through the package menu and
674 are not considered for upgrades.
676 The effect is that a user can manually place a specific version of a
677 package inside `package-directory-list' and the package menu will
681 *** If a package is available on multiple archives and one has higher
682 priority (as per `package-archive-priorities') only that one is
683 listed. This can be configured with `package-menu-hide-low-priority'.
686 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
687 This includes the above-mentioned low-priority packages, as well as
688 available packages whose version is lower than the currently installed
689 version (which were previously impossible to display).
690 This allows users to downgrade a package if a lower version is
694 *** When filtering the package menu, keywords starting with "arc:" or
695 "status:" represent package archive or status, respectively, instead
699 *** Most functions which involve downloading information now take an
700 ASYNC argument. If it is non-nil, package.el performs the download(s)
704 *** New variable `package-menu-async' controls whether the
705 package-menu uses asynchronous downloads.
708 *** `package-install-from-buffer' and `package-install-file' work on directories.
709 This follows the same rules as installing from a .tar file, except the
710 -pkg file is optional.
713 *** Packages which are dependencies of other packages cannot be deleted.
714 The FORCE argument to `package-delete' overrides this.
717 *** New custom variable `package-selected-packages' tracks packages
718 which were installed by the user (as opposed to installed as
719 dependencies). This variable can also be manually customized.
722 *** New command `package-install-selected-packages' installs all
723 packages from `package-selected-packages' which are currently missing.
726 *** `package-install' function now takes a DONT-SELECT argument. If
727 this function is called interactively or if DONT-SELECT is nil, add the
728 package being installed to `package-selected-packages'.
731 *** New command `package-autoremove' removes all packages which were
732 installed strictly as dependencies but are no longer needed.
737 When you invoke `shell' interactively, the *shell* buffer will now
738 display in a new window. However, you can customize this behavior via
739 the `display-buffer-alist' variable. For example, to get
740 the old behavior -- *shell* buffer displays in current window -- use
741 (add-to-list 'display-buffer-alist
742 '("^\\*shell\\*$" . (display-buffer-same-window))).
746 *** The `:protection' slot option is not obeyed any more.
748 *** The `newname' argument to constructors is optional&deprecated.
749 If you need your objects to be named, do it by inheriting from `eieio-named'.
751 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
753 *** The <class> variables are declared obsolete.
755 *** The <initarg> variables are declared obsolete.
757 *** defgeneric and defmethod are declared obsolete.
758 Use the equivalent facilities from cl-generic.el instead.
760 *** `constructor' is now an obsolete alias for `make-instance'.
761 --- `pcase' accepts a new UPattern `eieio'.
766 *** New command `ido-bury-buffer-at-head' bound to C-S-b
767 Bury the buffer at the head of `ido-matches', analogous to how C-k
768 kills the buffer at head.
771 *** A prefix argument to `ido-restrict-to-matches' will reverse its
772 meaning, and the list is restricted to those elements that do not
773 match the current input.
778 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
779 The new commands `next-line-or-history-element' and
780 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
781 minibuffer, allow by-line movement through minibuffer history,
782 similarly to an ordinary buffer. Only when point moves over
783 the bottom/top of the minibuffer it goes to the next/previous history
784 element. `M-p' and `M-n' still move directly to previous/next history
787 ** Search and Replace
790 *** `isearch' and `query-replace' can now perform character folding in matches.
791 Isearch does that by default, while `query-replace' will do that if
792 the new variable `replace-character-fold' is customized to a non-nil
793 value. This is analogous to case folding, but instead of disregarding
794 case variants, it disregards wider classes of distinctions between
795 similar characters. (Case folding is a special case of character
796 folding.) This means many characters in the search string will match
797 entire groups of characters instead of just themselves.
799 For instance, the " will match all variants of double quotes (like “
800 and ”), and the letter a will match all of its accented cousins, even
801 those composed of multiple characters, as well as many other symbols
804 Character folding is enabled by customizing `search-default-mode' to
805 the value `character-fold-to-regexp'. If you want to turn character
806 folding off, customize the value of `search-default-mode' to the `nil'
807 value. You can also toggle character folding in the middle of a
808 search by typing `M-s ''.
811 *** New user option `search-default-mode'.
812 This option specifies the default mode for Isearch. The default
813 value, `character-fold-to-regexp' specifies that Isearch should fold
814 characters when searching.
817 *** New function `character-fold-to-regexp' can be used
818 by searching commands to produce a regexp matching anything that
819 character-folds into STRING.
822 *** The new M-s M-w key binding uses eww to search the web for the
823 text in the region. The search engine to use for this is specified by
824 the customizable variable `eww-search-prefix'.
827 *** Query-replace history is enhanced.
828 When query-replace reads the FROM string from the minibuffer, typing
829 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
830 and TO are the original text and its replacement, and SEP is an arrow
831 string defined by the new variable `query-replace-from-to-separator'.
832 To select a prior replacement, type `M-p' until the desired
833 replacement appears in the minibuffer, and then exit the minibuffer by
838 *** If `quick-calc' is called with a prefix argument, insert the
839 result of the calculation into the current buffer.
842 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
843 this you can tell Edebug not to stop at the start of the first
844 instrumented function.
849 *** New minor mode `global-eldoc-mode'
850 It is turned on by default, and affects `*scratch*' and other buffers
851 whose major mode supports Emacs Lisp.
854 *** `eldoc-documentation-function' now defaults to `ignore'
857 *** `describe-char-eldoc' displays information about character at point,
858 and can be used as a default value of `eldoc-documentation-function'. It is
859 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
860 ] [, ] [, etc.) while using mono-spaced font.
865 *** HTML can now be rendered using variable-width fonts.
868 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
869 whether to use variable-pitch fonts or not. The user can also
870 customize the `shr-use-fonts' variable.
873 *** A new command `C' (`eww-toggle-colors') can be used to toggle
874 whether to use the HTML-specified colors or not. The user can also
875 customize the `shr-use-colors' variable.
878 *** A new command `R' (`eww-readable') will try do identify the main
879 textual parts of a web page and display only that, leaving menus and
880 the like off the page.
883 *** A new command `D' (`eww-toggle-paragraph-direction') allows you to
884 toggle the paragraph direction between left-to-right and right-to-left.
887 *** Images that are being loaded are now marked with grey
888 "placeholder" images of the size specified by the HTML. They are then
889 replaced by the real images asynchronously, which will also now
890 respect width/height HTML specs (unless they specify widths/heights
891 bigger than the current window).
894 *** You can now use several eww buffers in parallel by renaming eww
895 buffers you want to keep separate.
898 *** Partial state of the eww buffers (the URIs and the titles of the
899 pages visited) is now preserved in the desktop file.
902 *** `eww-after-render-hook' is now called after eww has rendered
903 the data in the buffer.
906 *** The `eww-reload' command now takes a prefix to not reload via
907 the net, but just use the local copy of the HTML.
910 *** The DOM shr and eww uses has been changed to the general Emacs
911 xml.el/libxml2 DOM, and a new package dom.el has been added to
912 interact with this DOM. See the Emacs Lisp manual for interface
916 *** `mailcap-mime-data' is now consulted when displaying PDF files.
919 *** The new `S' command will list all eww buffers, and allow managing
923 *** https pages with valid certificates have headers marked in green, while
924 invalid certificates are marked in red.
929 *** text/html messages that contain inline image parts will be
930 transformed into multipart/related messages before sending.
933 *** The `message-valid-fqdn-regexp' variable has been removed, since
934 there are now top-level domains added all the time. Message will no
935 longer warn about sending emails to top-level domains it hasn't heard
938 *** `message-beginning-of-line' (bound to C-a) understands folded headers.
939 In `visual-line-mode' it will look for the true beginning of a header
940 while in non-`visual-line-mode' it will move the point to the indented
944 ** In Show Paren Mode, a parenthesis can be highlighted when point
945 stands inside it, and certain parens can be highlighted when point is
946 at BOL or EOL, or in whitespace there. To enable these, customize,
947 respectively, `show-paren-when-point-inside-paren' or
948 `show-paren-when-point-in-periphery'.
951 ** If gpg2 exists on the system, it is now used as the default value
952 of `epg-gpg-program' (instead of gpg).
957 *** Images are automatically scaled before displaying based on the
958 `image-scaling-factor' variable (if Emacs supports scaling the images
962 *** Images inserted with `insert-image' and related functions get a
963 keymap put into the text properties (or overlays) that span the
964 image. This keymap binds keystrokes for manipulating size and
965 rotation, as well as saving the image to a file. These commands are
966 also available in `image-mode'.
969 *** A new library for creating and manipulating SVG images has been
970 added. See the "SVG Images" section in the lispref manual for
974 *** New setf-able function to access and set image parameters is
975 provided: `image-property'.
981 *** Strings after `:documentation' are highlighted as docstrings.
982 This enhances Lisp mode fontification to handle documentation of the
983 form `(:documentation "the doc string")' used in Common Lisp code for
984 CLOS class and slot documentation.
989 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
992 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
993 *** `string-rectangle' provides on-the-fly preview of the result.
996 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
997 These should be used in preference to `font-lock-fontify-buffer' when
1001 ** Macro `minibuffer-with-setup-hook' can optionally append a function
1002 to `minibuffer-setup-hook'.
1004 If the first argument of the macro is of the form `(:append FUN)',
1005 then FUN will be appended to `minibuffer-setup-hook', instead of
1010 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
1013 *** `pcase' accepts the new UPattern `cl-struct'.
1015 ** Calendar and diary
1018 *** The default `diary-file' is now located in .emacs.d.
1021 *** New commands to insert diary entries with Chinese dates:
1022 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
1023 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
1026 *** The calendar can now list and mark diary entries with Chinese dates.
1027 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
1030 *** The option `calendar-mode-line-format' can now be nil,
1031 which means to do nothing special with the mode line in calendars.
1034 *** New option `calendar-weekend-days'.
1035 The option customizes which day headers receive the
1036 `calendar-weekend-header' face.
1039 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
1042 *** Many items obsolete since at least version 23.1 have been removed.
1043 The majority were function/variable/face aliases, too numerous to list here.
1046 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
1047 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
1049 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
1051 **** Macro `calendar-for-loop'.
1053 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
1055 **** The nil and list forms of `diary-display-function'.
1058 ** New ERT function `ert-summarize-tests-batch-and-exit'.
1059 If the output of ERT tests in batch mode execution can be saved to a
1060 log file, then it can be passed as an argument to the above function
1061 to produce a neat summary.
1064 ** New js.el option `js-indent-first-init'.
1065 It was renamed from `js-indent-first-initialiser', to avoid issues
1066 with American vs British spelling.
1071 ** Info mode now displays symbol names in fixed-pitch font.
1072 If you want to get the old behavior back, customize the `Info-quoted'
1073 face to use the same definitions as the default face.
1076 *** `Info-fontify-maximum-menu-size' can be t for no limit.
1079 *** `info-display-manual' can now be given a prefix argument which (any
1080 non-nil value) directs the command to limit the completion
1081 alternatives to currently visited manuals.
1084 ** ntlm.el has support for NTLM2.
1089 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
1090 to delete or undelete multiple messages.
1093 *** Rmail can now render HTML mail messages if your Emacs was built with
1094 libxml2 or if you have the Lynx browser installed. By default, Rmail
1095 will display the HTML version of a mail message that has both HTML and
1096 plain text parts, if display of HTML email is possible; customize the
1097 `rmail-mime-prefer-html' option to `nil' if you don't want that.
1100 *** In the commands that make summaries by subject, recipients, or senders,
1101 you can no longer use commas to separate regular expressions.
1104 ** SES now supports local printer functions; see `ses-define-local-printer'.
1106 ** Shell-script Mode
1108 *** In sh-mode you can now use `sh-shell' as a file-local variable to
1109 specify the type of shell in use (bash, csh, etc).
1112 *** New value `always' for `sh-indent-after-continuation'.
1113 This provides old-style ("dumb") indentation of continued lines.
1114 See the doc string of `sh-indent-after-continuation' for details.
1118 *** Fatal TLS errors are now silent by default.
1121 *** If Emacs isn't built with TLS support, an external TLS-capable
1122 program is used instead. This program used to be run in --insecure
1123 mode by default, but has now changed to be secure instead, and will
1124 fail if you try to connect to non-verifiable hosts. This is
1125 controlled by the `tls-program' variable.
1130 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
1131 When `url-handler-mode' is enabled, file operations for these
1132 protocols as well as for "telnet" and "ftp" are passed to Tramp.
1135 *** The URL package allows customizing the `url-user-agent' string.
1136 The new `url-user-agent' variable can be customized to be a string or
1140 *** The new interface variable `url-request-noninteractive' can be used
1141 to specify that we're running in a noninteractive context, and that
1142 we should not be queried about things like TLS certificate validity.
1145 *** `url-mime-accept-string' can now be used as in "interface"
1146 variable, meaning you can bind it around an `url-retrieve' call.
1149 *** If URL is used with a https connection, the first callback argument
1150 plist will contain a :peer element that has the output of
1151 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
1154 *** The new function `url-cookie-delete-cookie' can be used to
1155 programmatically delete all cookies, or cookies from a specific
1161 *** New connection method "afp", which allows you to access Mac OS X
1162 volumes via the Apple Filing Protocol.
1165 *** New connection method "nc", which allows you to access dumb
1169 *** Method-specific parameters can be overwritten now with variable
1170 `tramp-connection-properties'.
1173 *** Handler for `file-notify-valid-p' for remote machines that support
1174 filesystem notifications.
1179 *** New user variable `sql-default-directory' enables remote
1180 connections using Tramp.
1183 *** New command `sql-send-line-and-next'.
1184 This command, bound to `C-c C-n' by default, sends the current line to
1185 the SQL process and advances to the next line, skipping whitespace and
1189 *** Added support for Vertica SQL.
1191 ** VC and related modes
1194 *** Basic push support, via `vc-push', bound to `C-x v P'.
1195 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
1196 (undocumented) command vc-hg-push now behaves slightly differently.
1199 *** The new command vc-region-history shows the log+diff of the active region.
1202 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
1203 This command is useful when you perform version control commands
1204 outside Emacs (e.g., from the shell prompt), or if you switch the VC
1205 back-end for the buffer's file, or remove it from version control.
1208 *** The VC state indicator in the mode line now defaults to more
1209 colorful faces to make it more obvious to the user what the state is.
1210 See the `vc-faces' customization group.
1213 *** New option `vc-annotate-background-mode' controls whether
1214 the color range from `vc-annotate-color-map' is applied to the
1215 background or to the foreground.
1218 *** `compare-windows' now compares text with the most recently selected window
1219 instead of the next window. If you want the previous behavior of
1220 comparing with the next window, customize the new option
1221 `compare-windows-get-window-function' to the value
1222 `compare-windows-get-next-window'.
1225 *** Two new faces `compare-windows-removed' and `compare-windows-added'
1226 replace the face `compare-windows', which is now an obsolete alias for
1227 `compare-windows-added'.
1230 *** The VC state indicator in the mode line now has different faces
1231 corresponding to each of the possible states. See the `vc-faces'
1232 customization group.
1235 *** `log-edit-insert-changelog' converts "(tiny change)" to
1236 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
1237 nil to disable this.
1240 ** VHDL mode now supports VHDL'08.
1245 *** Decimal display mode uses "," groups, so it's more
1246 fitting for use in money calculations
1249 *** Factorial works with non-integer inputs.
1254 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1255 macro argument expansion, interactive macro evaluation and automatic
1256 scanning of #define'd symbols.
1259 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
1260 result of evaluating a macro.
1263 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
1264 all defined symbols in `hide-ifdef-env'.
1267 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
1268 file name patterns. Defaults to files whose extension is one of `.h',
1269 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
1272 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
1273 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1274 (This could happen when an idempotent header file is visited again,
1275 when its guard symbol is already defined.) Defaults to `t'.
1278 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
1279 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1280 looking for macro definitions. By default, no symbols are ignored.
1285 *** New custom variable `tex-print-file-extension' to help users who
1286 use PDF instead of DVI.
1289 *** TeX mode now supports Prettify Symbols mode. When enabling
1290 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1291 many other math macros are displayed using unicode characters.
1294 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
1295 By default, 32 consecutive spaces or four consecutive TABs are
1296 considered to be too deep, but the new variable
1297 `whitespace-big-indent-regexp' can be customized to change that.
1300 ** New options in `tildify-mode'.
1301 New options `tildify-space-string', `tildify-pattern', and
1302 `tildify-foreach-region-function' variables make
1303 `tildify-string-alist', `tildify-pattern-alist', and
1304 `tildify-ignored-environments-alist' variables (as well as a few
1305 helper functions) obsolete.
1308 ** New package Xref replaces Etags's front-end and UI
1310 The new package Xref provides a generic framework and new commands to
1311 find and move to definitions of functions, macros, data structures
1312 etc., as well as go back to the location where you were before moving
1313 to a definition. It supersedes and obsoletes many Etags commands,
1314 while still using the etags.el code that reads the TAGS tables as one
1317 The command `xref-find-definitions' replaces `find-tag' and provides
1318 an interface to pick one definition among several.
1319 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
1320 `pop-tag-mark', but has a keybinding (`M-,') different from the one
1321 `pop-tag-mark' used.
1323 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
1324 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1325 `xref-find-apropos' replaces `find-tag-regexp'.
1327 As a result of this, the following commands are now obsolete:
1328 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1331 `tags-loop-continue' is not obsolete because it's still useful in
1332 `tags-search' and `tags-query-replace', for which there are no direct
1336 *** Variants of `tags-search' and `tags-query-replace' in Dired were also
1337 replaced by xref-style commands, see the "Dired" section below.
1342 `find-tag-marker-ring-length' is now an obsolete alias for
1343 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1344 alias for a private variable. `xref-push-marker-stack' and
1345 `xref-pop-marker-stack' should be used instead to manipulate the stack
1346 of searches for definitions.
1349 *** `xref-find-definitions' and `describe-function' now display
1350 information about mode local overrides (defined by cedet/mode-local.el
1351 `define-overloadable-function' `define-mode-local-overrides').
1353 The framework's Lisp API is still experimental and can change in major,
1354 backward-incompatible ways.
1357 ** New package Project
1359 The new package Project provides generic infrastructure for dealing
1360 with projects. The main commands included in it are
1361 `project-find-file' and `project-find-regexp'.
1363 The Lisp API of this package is still experimental.
1366 EUDC's LDAP backend has been improved.
1369 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1372 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1373 subprocess instead of on the command line.
1376 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1377 need to configure this manually anymore.
1380 *** The LDAP configuration section of EUDC's manual has been
1383 There have also been customization changes.
1386 *** New custom variable `eudc-server-hotlist' to allow specifying
1387 multiple EUDC servers in init file.
1390 *** Custom variable `eudc-inline-query-format' defaults to completing
1391 on email and firstname instead of surname.
1394 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1395 to avoid interfering with the kill ring.
1398 *** Custom variable `eudc-inline-expansion-format' defaults to
1399 "Firstname Surname <mail-address>".
1402 *** Custom variable `eudc-options-file' defaults to
1403 "~/.emacs.d/eudc-options".
1406 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1407 allow overriding the regular expression that recognizes the ldapsearch
1408 command line's password prompt.
1411 EUDC's BBDB backend now supports BBDB 3.
1414 EUDC's PH backend (eudcb-ph.el) is obsolete.
1419 *** The new built-in command `clear' can scroll window contents out of sight.
1420 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1423 *** New buffer syntax '#<buffer-name>', which is equivalent to
1424 '#<buffer buffer-name>'. This shorthand makes interacting with
1425 buffers from eshell more convenient. Custom variable
1426 `eshell-buffer-shorthand', which has been broken for a while, has been
1430 *** By default, eshell "visual" program buffers (created by
1431 `eshell-visual-commands' and similar custom vars) are no longer killed
1432 when their processes die. This fixes issues with short-lived commands
1433 and makes visual programs more useful in general. For example, if
1434 "git log" is a visual command, it will always show the visual command
1435 buffer, even if the "git log" process dies. For the old behavior,
1436 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1441 *** Support for the Google Chrome web browser.
1444 *** Support for the Conkeror web browser.
1447 *** Support for several ancient browsers is now officially obsolete.
1450 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1451 be added to the archive.
1456 *** Dired buffers are also auto-reverted via file notifications, if
1457 Emacs is compiled with file notification support.
1460 *** `auto-revert-use-notify' is set to nil in `global-auto-revert-mode'.
1461 See <http://debbugs.gnu.org/22814>.
1463 ** File Notifications
1466 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1469 *** The new event `stopped' signals, that a file notification watch is
1470 not active any longer.
1473 *** The new function `file-notify-valid-p' checks, whether a file
1474 notification descriptor still corresponds to an activate watch.
1479 *** The command `dired-do-compress' bound to `Z' now can compress
1480 directories and decompress zip files.
1483 *** New command `dired-do-compress-to' bound to `c' can be used to
1484 compress many marked files into a single named archive. The
1485 compression command is determined from the new
1486 `dired-compress-files-alist' variable.
1489 *** In wdired, when editing files to contain slash characters,
1490 the resulting directories are automatically created. Whether
1491 to do this or not is controlled by the
1492 `wdired-create-parent-directories' variable.
1495 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1496 viewing HTML files and the like.
1498 *** New user interface for the `A' and `Q' commands.
1499 These keys, now bound to `dired-do-find-regexp' and
1500 `dired-do-find-regexp-and-replace', work similarly to `xref-find-apropos'
1501 and `xref-query-replace-in-results': they present the matches
1502 in the `*xref*' buffer and let you move through the matches. No need
1503 to use `tags-loop-continue' to resume the search or replace loop. The
1504 previous commands, `dired-do-search' and
1505 `dired-do-query-replace-regexp', are still available, but not bound to
1506 keys; rebind `A' and `Q' to invoke them if you want the old behavior
1507 back. We intend to obsolete the old commands in a future release.
1509 ** Tabulated List Mode
1512 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1513 call `tabulated-list-init-header', in which case it will have no
1517 *** `tabulated-list-print' takes a second optional argument, update,
1518 which specifies an alternative printing method which is faster when
1519 few or no entries have changed.
1521 ** Obsolete packages
1527 *** landmark.el (moved to elpa.gnu.org)
1530 * New Modes and Packages in Emacs 25.1
1533 ** pinentry.el allows GnuPG passphrase to be prompted through the
1534 minibuffer instead of a graphical dialog, depending on whether the gpg
1535 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1536 is set). This feature requires newer versions of GnuPG (2.1.5 or
1537 later) and Pinentry (0.9.5 or later). To use this feature, add
1538 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
1539 configuration with "gpgconf --reload gpg-agent".
1542 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1543 The main entry points are `cl-defgeneric' and `cl-defmethod'. See the
1544 node "Generic Functions" in the Emacs Lisp manual for more details.
1547 ** scss-mode (a minor variant of css-mode) is a major mode for editing
1548 SCSS (Sassy CSS) files.
1551 ** let-alist is a new macro (and a package) that allows one to easily
1552 let-bind the values stored in an alist.
1555 ** `tildify-mode' allows automatic insertion of hard spaces as one
1556 types the text. Breaking line after a single-character words is
1557 forbidden by Czech and Polish typography (and may be discouraged in
1558 other languages), so `auto-tildify-mode' makes it easier to create
1559 a typographically-correct documents.
1562 ** The `seq' library adds sequence manipulation functions and macros
1563 that complement basic functions provided by subr.el. All functions
1564 are prefixed with `seq-' and work on lists, strings and vectors.
1565 `pcase' accepts a new Upattern `seq'.
1568 ** The `map' library provides map-manipulation functions that work on
1569 alists, hash-table and arrays. All functions are prefixed with
1570 `map-'. `pcase' accepts a new UPattern `map'.
1573 ** The `thunk' library provides functions and macros to control the
1574 evaluation of forms.
1577 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1578 support for JSX, an XML-like syntax extension to ECMAScript.
1581 * Incompatible Lisp Changes in Emacs 25.1
1584 ** `setq' and `setf' must now be called with an even number of
1585 arguments. The earlier behavior of silently supplying a nil to the
1586 last variable when there was an odd number of arguments has been
1590 ** `syntax-begin-function' is declared obsolete.
1591 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1592 slot in font-lock-defaults.
1595 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1596 called during startup. Users who call this function in their init
1597 file and still expect it to be run after startup should set
1598 `package-enable-at-startup' to t after the call to
1599 `package-initialize'.
1602 ** `:global' minor mode use `setq-default' rather than `setq'.
1603 This means that you can't use `make-local-variable' and expect them to
1604 "magically" become buffer-local.
1607 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1608 The `track-mouse' form no longer refrains from changing the shape of
1609 the mouse pointer for the entire time the body of that form is
1610 executed. Lisp programs that use `track-mouse' for dragging across
1611 large portions of the Emacs display, and want to avoid changes in the
1612 pointer shape during dragging, should bind the variable `track-mouse'
1613 to the special value `dragging' in the body of the form.
1616 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1617 has any effect. (This change was made in Emacs 24.4 but was not
1618 advertised at the time.)
1621 ** `indirect-function' does not signal `void-function' any more.
1622 This is mostly a bug-fix, since this change was missed back in 24.4 when
1623 symbol-function was changed not to signal `void-function' any more.
1626 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1629 ** Comint, term, and compile do not set the EMACS env var any more.
1630 Use the INSIDE_EMACS environment variable instead.
1632 ** `C-up', `C-down', `C-left' and `C-right' are now defined in term
1633 mode to send the same escape sequences that xterm does. This makes
1634 things like forward-word in readline work.
1637 ** hideshow mode got four key bindings that are analogous to outline
1638 mode bindings: `C-c @ C-a', `C-c @ C-t', `C-c @ C-d', and `C-c @ C-e.'
1641 ** `save-excursion' does not save&restore the mark any more.
1642 Use `save-mark-and-excursion' if you want the old behavior.
1645 ** `read-buffer' and `read-buffer-function' can now be called with a 4th
1646 argument (`predicate').
1649 ** `completion-table-dynamic' by default stays in the minibuffer.
1650 The minibuffer will be the current buffer when the function is called.
1651 If you want the old behavior of calling the function in the buffer
1652 from which the minibuffer was entered, use the new argument
1653 `switch-buffer' to `completion-table-dynamic'.
1656 ** window-configurations no longer record the buffers' marks.
1659 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1660 active region handling.
1663 ** deactivate-mark is now buffer-local.
1666 ** `cl-the' now asserts that its argument is of the given type.
1669 ** `process-running-child-p' may now return a numeric process
1670 group ID instead of `t'.
1673 ** Mouse click events on mode line or header line no longer include
1674 any reference to a buffer position. The 6th member of the mouse
1675 position list returned for such events is now nil.
1678 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1679 These slots used to hold key-shortcut data, but have been obsolete since
1683 ** Emacs no longer downcases the first letter of a system diagnostic
1684 when signaling a file error. For example, it now reports "Permission
1685 denied" instead of "permission denied". The old behavior was problematic
1686 in languages like German where downcasing rules depend on grammar.
1689 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1690 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1691 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1692 and apostrophe `like this'. The default value nil acts like ‘curve’
1693 if curved single quotes are displayable, and like ‘grave’ otherwise.
1694 The new variable affects display of diagnostics and help, but not of info.
1697 ** substitute-command-keys now replaces quotes.
1698 That is, it converts documentation strings’ quoting style as per the
1699 value of ‘text-quoting-style’. Doc strings in source code can use
1700 either curved single quotes or grave accents and apostrophes. As
1701 before, characters preceded by \= are output as-is.
1704 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1705 They use the new ‘format-message’ function instead of plain ‘format’,
1706 so that they now follow user preference as per ‘text-quoting-style’
1707 when processing curved single quotes, grave accents, and apostrophes
1708 in their format argument.
1711 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1712 now match multibyte characters using Unicode character properties.
1713 If you want the old behavior where they matched any character with
1714 word syntax, use `\sw' instead.
1717 ** The character classes [:graph:] and [:print:] in regular expressions
1718 no longer match every multibyte character. Instead, Emacs now
1719 consults the Unicode character properties to determine which
1720 characters are graphic or printable. In particular, surrogates and
1721 unassigned codepoints are now rejected. If you want the old behavior,
1722 use [:multibyte:] instead.
1725 ** The `diff' command uses the unified format now. To restore the old
1726 behavior, set `diff-switches' to `-c'.
1729 ** `grep-template' and `grep-find-template' values don't include the
1730 --color argument anymore. It's added at the <C> place holder position
1731 dynamically. Any third-party code that changes these templates should
1732 be updated accordingly.
1734 ** The grep/rgrep/lgrep functions will now ask about saving files
1735 before running. This is controlled by the `grep-save-buffers'
1739 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1740 The new behavior is compatible with Common Lisp and with XEmacs.
1741 This change does not affect Lisp code intended to be portable to
1742 Emacs 24.2 and earlier, which did not support unary ‘/’.
1745 ** The `default-directory' value doesn't have to end slash. To make
1746 that happen, `unhandled-file-name-directory' now defaults to calling
1747 `file-name-as-directory'.
1750 * Lisp Changes in Emacs 25.1
1754 *** New UPatterns `quote', `app'.
1756 *** New UPatterns can be defined with `pcase-defmacro'.
1758 *** New vector QPattern.
1761 ** syntax-propertize is now automatically called on-demand during forward
1762 parsing functions like `forward-sexp'.
1765 ** New hooks `prefix-command-echo-keystrokes-functions' and
1766 `prefix-command-preserve-state-hook' allow the definition of prefix
1767 commands other than the predefined `C-u'.
1770 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1771 These allow conversion between buffer positions and the corresponding
1772 file byte offsets, given the file's encoding.
1775 ** The default value of `load-read-function' is now `read'.
1776 Previously, the default value of `nil' implied using `read'.
1779 ** New hook `pre-redisplay-functions'.
1780 It is a bit easier to use than `pre-redisplay-function'.
1783 ** The second arg of `looking-back' should always be provided explicitly.
1784 Previously, it was an optional argument, now it's mandatory.
1787 ** Text properties `intangible', `point-entered', and `point-left' are obsolete.
1788 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1789 implemented by the new `cursor-intangible-mode' and
1790 `cursor-sensor-mode' minor modes.
1793 ** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
1794 Use the new minor modes `cursor-intangible-mode' and
1795 `cursor-sensor-mode' instead.
1798 ** New process type `pipe', which can be used in combination with the
1799 `:stderr' keyword of make-process to handle standard error output
1803 ** New function `make-process' provides an alternative interface to
1804 `start-process'. It allows programs to set process parameters such as
1805 process filter, sentinel, etc., through keyword arguments (similar to
1806 `make-network-process').
1809 ** A new function `directory-files-recursively' returns all matching
1810 files (recursively) under a directory.
1813 ** New variable `inhibit-message', when bound to non-nil, inhibits
1814 `message' and related functions from displaying messages in the echo
1815 area. The output is still logged to the *Messages* buffer.
1818 ** A new text property `inhibit-read-only' can be used in read-only
1819 buffers to allow certain parts of the text to be writable.
1822 ** A new variable `comment-end-can-be-escaped' is useful in languages
1823 such as C and C++ where line comments with escaped newlines are
1824 continued to the next line.
1827 ** New macro `define-advice'.
1830 ** Emacs Lisp now supports generators.
1831 See the "Generators" section of the ELisp manual for the details.
1834 ** New finalizer facility for running code when objects become unreachable.
1835 See the "Finalizer Type" subsection in the ELisp manual for the
1839 ** lexical closures can use (:documentation FORM) to build their docstring.
1840 It should be placed right where the docstring would be, and FORM is then
1841 evaluated (and should return a string) when the closure is built.
1844 ** The new command `fortune-message' has been added, which displays
1845 fortunes in the echo area.
1848 ** define-inline provides a new way to define inlinable functions.
1851 ** New function `macroexpand-1' to perform a single step of macro expansion.
1854 ** Some "x-*" functions were obsoleted and/or renamed:
1855 *** x-select-text is renamed gui-select-text.
1856 *** x-selection-value is renamed gui-selection-value.
1857 *** x-get-selection is renamed gui-get-selection.
1858 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1859 *** x-get-selection-value is renamed to gui-get-primary-selection.
1860 *** x-set-selection is renamed to gui-set-selection
1863 ** New function `string-greaterp', which return the opposite result of
1867 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1868 preserve the collation order as defined by the system's locale(1)
1869 environment. For the time being this is implemented for modern POSIX
1870 systems and for MS-Windows, for other systems they fall back to their
1871 counterparts `string-lessp' and `string-equal'.
1874 ** The new function `string-version-lessp' compares strings by
1875 interpreting consecutive runs of numerical characters as numbers, and
1876 compares their numerical values. According to this predicate,
1877 "foo2.png" is smaller than "foo12.png".
1880 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1881 The effect is that, on systems that use ls-lisp for Dired, the default
1882 sort order of the files in Dired is now different from what it was in
1883 previous versions of Emacs. In particular, the file names are sorted
1884 disregarding punctuation, accents, and diacritics, and letter case is
1885 ignored. For example, files whose name begin with a period will no
1886 longer appear near the beginning of the directory listing. If you
1887 want the old, locale-independent sorting, customize the new option
1888 `ls-lisp-use-string-collate' to the nil value.
1891 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1892 if set to a non-nil value, causes the above 2 functions to ignore
1893 symbol and punctuation characters when collating strings. This
1894 emulates the behavior of modern Posix platforms when the locale's
1895 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1896 MS-Windows doesn't support UTF-8 as codeset in its locales.
1899 ** New function `alist-get', which is also a valid place (aka lvalue).
1902 ** New function `funcall-interactively', which works like `funcall'
1903 but makes `called-interactively-p' treat the function as (you guessed it)
1904 called interactively.
1907 ** New function `function-put' to use instead of `put' for function properties.
1910 ** The new function `bidi-find-overridden-directionality' allows you to
1911 find characters whose directionality was, perhaps maliciously,
1912 overridden by directional override control characters. Lisp programs
1913 can use this to detect potential phishing of URLs and other links that
1914 exploits bidirectional display reordering.
1917 ** The new function `buffer-substring-with-bidi-context' allows you to
1918 copy a portion of a buffer into a different location while preserving
1919 the visual appearance both of the copied text and the text at
1920 destination, even when the copied text includes mixed bidirectional
1921 text and directional control characters.
1924 ** New properties that can be specified with `declare':
1925 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1926 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1927 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1931 ** New macro `with-file-modes', for evaluating expressions with default file
1932 permissions set to temporary values (e.g., for creating private files).
1935 ** You can access the slots of structures using `cl-struct-slot-value'.
1938 ** Function `sort' can deal with vectors.
1941 ** Function `system-name' now returns an updated value if the current
1942 system's name has changed or if the Emacs process has changed systems,
1943 and to avoid long waits it no longer consults DNS to canonicalize the
1944 name. The variable `system-name' is now obsolete.
1947 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1950 ** If `pwd' is called with a prefix argument, insert the current default
1954 ** New functions return extended information about fonts and faces.
1957 *** The function `font-info' now returns more details about a font.
1958 In particular, it now returns the average width of the font's
1959 characters, which can be used for geometry-related calculations.
1962 *** A new function `default-font-width' returns the average width of a
1963 character in the current buffer's default font. If the default face
1964 is remapped (see `face-remapping-alist'), the value for the remapped
1965 face is returned. This function complements the existing function
1966 `default-font-height'.
1969 *** New functions `window-font-height' and `window-font-width' return
1970 the height and average width of characters in a specified face and
1971 window. If FACE is remapped (see `face-remapping-alist'), the
1972 function returns the information for the remapped face.
1975 *** A new function `window-max-chars-per-line' returns the maximal
1976 number of characters that can be displayed on one line. If a face
1977 and/or window are provided, these values are used for the
1978 calculation. This function is different from `window-body-width' in
1979 that it accounts for (i) continuation glyphs, (ii) the size of the
1980 font, and (iii) the specified window.
1983 ** New utilities in subr-x.el:
1984 *** New macros `if-let' and `when-let' allow defining bindings and to
1985 execute code depending whether all values are true.
1986 *** New macros `thread-first' and `thread-last' allow threading a form
1987 as the first or last argument of subsequent forms.
1990 ** Documentation strings now support quoting with curved single quotes
1991 ‘like-this’ in addition to the old style with grave accent and
1992 apostrophe `like-this'. The new style looks better on today's displays.
1993 In the new Electric Quote mode, you can enter curved single quotes
1994 into documentation by typing ` and '. Outside Electric Quote mode,
1995 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1996 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1997 ‘text-quoting-style’, the user can specify how to display doc string
2001 ** New function ‘format-message’ is like ‘format’ and also converts
2002 curved single quotes, grave accents and apostrophes as per
2003 ‘text-quoting-style’.
2006 ** show-help-function's arg is converted via substitute-command-keys
2007 before being passed to the function. Help strings, help-echo
2008 properties, etc. can therefore contain command key escapes and
2012 ** Time-related changes:
2014 *** Time conversion functions now accept an optional ZONE argument
2015 that specifies the time zone rules for conversion. ZONE is omitted or
2016 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
2017 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
2018 rule. The affected functions are ‘current-time-string’,
2019 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
2020 function ‘encode-time’, which already accepted a simple time zone rule
2021 argument, has been extended to accept all the new forms.
2023 *** Time-related functions now consistently accept numbers
2024 (representing seconds since the epoch) and nil (representing the
2025 current time) as well as the usual list-of-integer representation.
2026 Affected functions include `current-time-string', `current-time-zone',
2027 `decode-time', `float-time', `format-time-string', `seconds-to-time',
2028 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
2029 `time-to-days', and `time-to-seconds'.
2031 *** The `encode-time-value' and `with-decoded-time-value' macros have
2034 *** `calendar-next-time-zone-transition', `time-add', and
2035 `time-subtract' no longer return time values in the obsolete and
2036 undocumented integer-pair format. Instead, they return a list of two
2040 ** New function `set-binary-mode' allows switching a standard stream
2041 of the Emacs process to binary I/O mode.
2044 ** The new function `directory-name-p' can be used to check whether a file
2045 name (as returned from, for instance, `file-name-all-completions') is
2046 a directory file name. It returns non-nil if the last character in
2047 the name is a directory separator character (forward slash on GNU and
2048 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
2051 ** ASCII approximations to curved quotes are put in standard-display-table
2052 if the terminal cannot display curved quotes.
2055 ** Standard output and error streams now transliterate characters via
2056 standard-display-table, and encode output using locale-coding-system.
2057 To force a specific encoding, bind `coding-system-for-write' to the
2058 coding-system of your choice when invoking functions like `prin1' and
2062 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
2065 ** New possible value for `system-type': `nacl'.
2066 This is used by Google's Native Client (NaCl).
2069 ** `read-color' will now display the color names using the color itself
2070 as the background color.
2073 ** There is now a new variable `flyspell-sort-corrections-function'
2074 that allows changing the way corrections are sorted.
2076 ** Miscellaneous name change
2079 For consistency with the usual Emacs spelling, the Lisp variable
2080 `hfy-optimisations' has been renamed to `hfy-optimizations'.
2081 The old name should still work, as an obsolescent alias.
2083 ** Changes in Frame- and Window- Handling
2086 *** Emacs can now draw horizontal scroll bars on some platforms that
2087 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
2088 Horizontal scroll bars are turned off by default.
2090 **** New function `horizontal-scroll-bars-available-p' telling whether
2091 horizontal scroll bars are available on the underlying system.
2093 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
2094 bars on all existing and future frames.
2096 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
2097 scroll bars on the selected frame.
2099 **** New frame parameters `horizontal-scroll-bars' and
2100 `scroll-bar-height' to set horizontal scroll bars and their height
2101 for individual frames and in `default-frame-alist'.
2103 **** New functions `frame-scroll-bar-height' and
2104 `window-scroll-bar-height' return the height of horizontal scroll
2105 bars on a specific frame or window.
2107 **** `set-window-scroll-bars' now accepts five parameters where the last
2108 two specify height and type of the window's horizontal scroll bar.
2110 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
2113 **** New buffer-local variables `horizontal-scroll-bar' and
2114 `scroll-bar-height'.
2117 *** New functions `frame-geometry' and `frame-edges' give access to a
2121 *** New functions `mouse-absolute-pixel-position' and
2122 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
2126 *** The function `window-edges' now accepts three additional arguments to
2127 retrieve body, absolute and pixel edges of the window.
2130 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
2131 `window-inside-absolute-pixel-edges' have been renamed to respectively
2132 `window-body-edges', `window-body-pixel-edges' and
2133 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
2136 *** New function `window-absolute-pixel-position' to get the screen
2137 coordinates of a visible buffer position.
2140 *** The height of a frame's menu and tool bar are no longer counted in the
2141 frame's text height. This means that the text height stands only for
2142 the height of the frame's root window plus that of the echo area (if
2143 present). This was already the behavior for frames with external tool
2144 and menu bars (like in the Gtk builds) but has now been extended to all
2148 *** Frames now do not necessarily preserve the number of columns or lines
2149 they display when setting default font, menu bar, fringe width, or
2150 scroll bars. In particular, maximized and fullscreen frames are
2151 conceptually never resized if such settings change. For fullheight and
2152 fullwidth frames, the behavior may depend on the toolkit used.
2153 **** New option `frame-inhibit-implied-resize' if non-nil, means that
2154 setting default font, menu bar, fringe width, or scroll bars of a
2155 specific frame does not resize that frame in order to preserve the
2156 number of columns or lines it displays.
2159 *** New function `window-preserve-size' allows you to preserve the size of
2160 a window without "fixing" it. It's supported by `fit-window-to-buffer',
2161 `temp-buffer-resize-mode' and `display-buffer'.
2164 *** New `display-buffer' action function `display-buffer-use-some-frame'.
2165 This displays the buffer in an existing frame other than the current
2166 frame, and allows the caller to specify a frame predicate to exclude
2170 *** New minor mode `window-divider-mode' and options
2171 `window-divider-default-places', `window-divider-default-bottom-width'
2172 and `window-divider-default-right-width'.
2175 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
2176 Those features have been deprecated in Gtk+ for a long time.
2181 *** etags no longer qualifies class members by default.
2183 By default, `etags' will not qualify class members for C-like
2184 object-oriented languages with their class names and namespaces, and
2185 will remove qualifications used explicitly in the code from the tag
2186 names it puts in TAGS files. This is so the etags.el back-end for
2187 `xref-find-definitions' is more accurate and produces less false
2190 Use --class-qualify (-Q) if you want the old default behavior of
2191 qualifying class members in C++, Java, and Objective C. Note that
2192 using -Q might make some class members become "unknown" to `M-.'
2193 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
2194 qualified names by hand.
2197 *** New language Ruby
2199 Names of modules, classes, methods, functions, and constants are
2200 tagged. Overloaded operators are also tagged.
2204 Names of packages, functions, and types are tagged.
2207 *** Improved support for Lua
2209 Etags now tags functions even if the "function" keyword follows some
2210 whitespace at line beginning.
2213 * Changes in Emacs 25.1 on Non-Free Operating Systems
2216 ** MS-Windows specific Emacs build scripts are no longer in the distribution
2217 This includes the makefile.w32-in files in various subdirectories, and
2218 the support files. The file nt/configure.bat now just tells the user
2219 to use the procedure described in nt/INSTALL, by running the Posix
2220 `configure' script in the top-level directory.
2223 ** Building Emacs for MS-Windows requires at least Windows XP
2224 or Windows Server 2003. The built binaries still run on all versions
2225 of Windows starting with Windows 9X.
2228 ** Emacs running on MS-Windows now supports the daemon mode.
2231 ** The byte counts in etags-generated TAGS files are now the same on
2232 MS-Windows as they are on other platforms.
2235 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
2236 Pass '--without-ns' to configure to create an X11 build, the old default.
2239 ** OS X 10.5 or older is no longer supported.
2242 ** OS X on PowerPC is no longer supported.
2245 ** New variable `ns-use-fullscreen-animation' controls animation for
2246 non-native NS fullscreen. The default is nil. Set to t to enable
2247 animation when entering and leaving fullscreen. For native OSX fullscreen
2251 ** The new function 'w32-application-type' returns the type of an
2252 MS-Windows application given the name of its executable program file.
2254 ** New variable `w32-pipe-buffer-size'.
2255 It can be used to tune the size of the buffer of pipes created for
2256 communicating with subprocesses, when the program run by a subprocess
2257 exhibits unusual buffering behavior. Default is zero, which lets the
2258 OS use its default size.
2261 ----------------------------------------------------------------------
2262 This file is part of GNU Emacs.
2264 GNU Emacs is free software: you can redistribute it and/or modify
2265 it under the terms of the GNU General Public License as published by
2266 the Free Software Foundation, either version 3 of the License, or
2267 (at your option) any later version.
2269 GNU Emacs is distributed in the hope that it will be useful,
2270 but WITHOUT ANY WARRANTY; without even the implied warranty of
2271 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2272 GNU General Public License for more details.
2274 You should have received a copy of the GNU General Public License
2275 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
2281 paragraph-separate: "[
\f]*$"