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 25.1
29 ** Building Emacs now requires C99 or later.
32 ** Building Emacs now requires GNU make, version 3.81 or later.
35 ** New configure option --with-cairo.
36 This builds Emacs with Cairo drawing. As a side effect, it provides
37 support for built-in printing, when Emacs was built with GTK+.
40 ** New configure option --with-modules.
41 This enables support for loading dynamic modules; see below.
44 ** By default, Emacs no longer works on IRIX. We expect that Emacs
45 users are not affected by this, as SGI stopped supporting IRIX in
46 December 2013. If you are affected, please send a bug report. You
47 should be able to work around the problem either by porting the Emacs
48 undumping code to GCC under IRIX, or by configuring --with-wide-int,
49 or by sticking with Emacs 24.4.
52 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
53 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
54 since Emacs 24.4, and the other variants were undocumented and were
55 obstacles to maintenance and development. GC_MARK_STACK and its
56 related symbols have been removed from the C internals.
59 ** 'configure' now prefers gnustep-config when configuring GNUstep.
60 If gnustep-config is not available, the old heuristics are used.
63 ** 'configure' now prefers inotify to gfile for file notification,
64 unless gfile is explicitly requested via --with-file-notification='gfile'.
67 ** 'configure' detects the kqueue file notification library on *BSD
68 and Mac OS X machines.
71 ** The configure option '--with-pkg-config-prog' has been removed.
72 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
75 ** The configure option '--with-mmdf' has been removed.
76 It was no longer useful, as it relied on libraries that are no longer
77 supported, and its presence led to confusion during configuration.
78 This affects only the 'movemail' utility; Emacs itself can still
79 process MMDF-format files as before.
82 ** The configure option '--enable-silent-rules' is now the default,
83 and silent rules are now quieter. To get the old behavior where
84 'make' chatters a lot, configure with '--disable-silent-rules' or
85 build with 'make V=1'.
88 ** The configure option '--with-gameuser' now allows to specify a
89 group instead of a user if its argument is prefixed by ':' (a colon).
90 This will cause the game score files in ${localstatedir}/games/emacs
91 to be owned by that group, and the helper program for updating them to
92 be installed setgid. The option now defaults to the 'games' group.
95 ** The `grep-changelog' script (and its manual page) are no longer included.
96 It has no particular connection to Emacs and has not changed in years,
97 so if you want to use it, you can always take a copy from an older Emacs.
100 ** Emacs 25 comes with a new set of icons.
101 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
102 The old Emacs logo icons are available as `emacs23.png' in the same location.
105 ** New make target `check-expensive' to run additional tests.
106 This includes all tests which run via "make check", plus additional
107 tests which take more time to perform.
110 * Startup Changes in Emacs 25.1
113 ** When Emacs is given a file as a command line argument and
114 `initial-buffer-choice' is non-nil, display both the file and
115 `initial-buffer-choice'. When Emacs is given more than one file and
116 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
117 and *Buffer List*. This makes Emacs convenient to use from the
118 command line when `initial-buffer-choice' is non-nil.
121 ** The value of ‘initial-scratch-message’ is now treated as a doc string
122 and can contain escape sequences for command keys, quotes, and the like.
125 * Changes in Emacs 25.1
127 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
128 If you have gtk3 and webkitgtk3 installed, you can access the
129 embedded webkit browser with `M-x xwidget-webkit-browse-url'. This
130 opens a new buffer with the embedded browser. The buffer will
131 have a new mode, `xwidget-webkit-mode' (similar to `image-mode'),
132 which supports the webkit widget.
134 *** New functions for xwidget-webkit mode `xwidget-webkit-insert-string',
135 `xwidget-webkit-adjust-size-dispatch', `xwidget-webkit-back',
136 `xwidget-webkit-browse-url', `xwidget-webkit-reload',
137 `xwidget-webkit-current-url', `xwidget-webkit-scroll-backward',
138 `xwidget-webkit-scroll-forward', `xwidget-webkit-scroll-down',
139 `xwidget-webkit-scroll-up'.
142 ** Emacs can now load shared/dynamic libraries (modules).
143 A dynamic Emacs module is a shared library that provides additional
144 functionality for use in Emacs Lisp programs, just like a package
145 written in Emacs Lisp would. The functions `load', `require',
146 `load-file', etc. were extended to load such modules, as they do with
147 Emacs Lisp packages. The new variable `module-file-suffix' holds the
148 system-dependent value of the file-name extension (`.so' on Posix
149 hosts) of the module files.
151 A module should export a C-callable function named
152 `emacs_module_init', which Emacs will call as part of the call to
153 `load' or `require' which loads the module. It should also export a
154 symbol named `plugin_is_GPL_compatible' to indicate that its code is
155 released under the GPL or compatible license; Emacs will refuse to
156 load modules that don't export such a symbol.
158 If a module needs to call Emacs functions, it should do so through the
159 API defined and documented in the header file `emacs-module.h'. Note
160 that any module that provides Lisp-callable functions will have to use
161 Emacs functions such as `fset' and `funcall', in order to register its
162 functions with the Emacs Lisp interpreter.
164 Modules can create `user-ptr' Lisp objects that embed pointers to C
165 struct's defined by the module. This is useful for keeping around
166 complex data structures created by a module, to be passed back to the
167 module's functions. User-ptr objects can also have associated
168 "finalizers" -- functions to be run when the object is GC'ed; this is
169 useful for freeing any resources allocated for the underlying data
170 structure, such as memory, open file descriptors, etc. A new
171 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
174 Loadable modules in Emacs are an experimental feature, and subject to
175 change in future releases. For that reason, their support is disabled
176 by default, and must be enabled by using the `--with-modules' option
180 ** Any file of the form .dir-locals*.el is now considered a dir-local
181 file, and multiple such files can be used in the same directory. See
182 the variable `dir-locals-file' for more information.
185 ** Network security (TLS/SSL certificate validity and the like) is
186 added via the new Network Security Manager (NSM) and controlled via
187 the `network-security-level' variable.
190 ** C-h l now also lists the commands that were run.
193 ** x-select-enable-clipboard is renamed select-enable-clipboard
194 and x-select-enable-primary is renamed select-enable-primary.
195 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
196 name it), with the proviso that on some systems (e.g. Windows)
197 select-enable-primary is ineffective since the system doesn't
198 have the equivalent of a primary selection.
201 ** New option `switch-to-buffer-in-dedicated-window' allows to customize
202 how `switch-to-buffer' proceeds interactively when the selected window
203 is strongly dedicated to its buffer.
206 ** The option `even-window-heights' has been renamed to
207 `even-window-sizes' and now handles window widths as well.
210 ** terpri gets an optional arg ENSURE to conditionally output a newline.
213 ** `insert-register' now leaves point after the inserted text
214 when called interactively. A prefix argument toggles this behavior.
217 ** The new variable `term-file-aliases' replaces some files from lisp/term.
218 The function `tty-run-terminal-initialization' consults this variable
219 when deciding what terminal-specific initialization code to run.
222 ** New variable `system-configuration-features', listing some of the
223 main features that Emacs was compiled with. This is mainly intended
224 for use in Emacs bug reports.
227 ** A password is now hidden also when typed in batch mode. Another
228 hiding character but the default `.' can be used by let-binding the
229 variable `read-hide-char'.
232 ** The Emacs pseudo-random number generator can be securely seeded.
233 On system where Emacs can access the system entropy or some other
234 cryptographically secure random stream, it now uses that when `random'
235 is called with its argument `t'. This allows cryptographically strong
236 random values; in particular, the Emacs server now uses this facility
237 to produce its authentication key.
240 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
243 * Editing Changes in Emacs 25.1
246 ** M-x suggests shorthands and ignores obsolete commands for completion.
251 *** Successive single-char deletions are collapsed in the undo-log just like
252 successive char insertions. Which commands invoke this behavior is
253 controlled by the new `undo-auto-amalgamate' function. See the node
254 "Undo" in the ELisp manual for more details.
257 *** The heuristic used to insert `undo-boundary' after each command
258 has changed, so that if a command causes changes in more than just the
259 current buffer, Emacs now calls `undo-boundary' in every buffer
260 affected by the command.
263 ** New command `comment-line' bound to `C-x C-;'.
265 ** New and improved facilities for inserting Unicode characters
268 *** Unicode names entered via C-x 8 RET now use substring completion by default.
271 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
272 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
275 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
276 as you type. See also the new variable ‘text-quoting-style’.
279 ** New minor mode global-eldoc-mode is enabled by default.
282 ** Emacs now supports "bracketed paste mode" when running on a terminal
283 that supports it. This facility allows Emacs to understand pasted
284 chunks of text as strings to be inserted, instead of interpreting each
285 character in the pasted text as actual user input. This results in a
286 paste experience similar to that under a window system, and significant
287 performance improvements when pasting large amounts of text.
290 ** Emacs now supports the latest version of the UBA.
291 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
292 was updated to support all the latest additions and changes introduced
293 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
294 This includes full support for directional isolates and the
295 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
299 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
302 ** New buffer-local `electric-pair-local-mode'.
305 ** New variable `fast-but-imprecise-scrolling' inhibits
306 fontification during full screen scrolling operations, giving less
307 hesitant operation during auto-repeat of C-v, M-v at the cost of
308 possible inaccuracies in the end position.
311 ** New documentation command `describe-symbol'.
312 Works for functions, variables, faces, etc. It is bound to `C-h o' by
316 ** New function `custom-prompt-customize-unsaved-options' checks for
317 unsaved customizations and prompts user to customize (if found). It
318 is intended for adding to 'kill-emacs-query-functions'.
321 * Changes in Specialized Modes and Packages in Emacs 25.1
326 *** New command `checkdoc-package-keywords' checks if the
327 current package keywords are recognized. Set the new option
328 `checkdoc-package-keywords-flag' to non-nil to make
329 `checkdoc-current-buffer' call this function automatically.
332 *** New function `checkdoc-file' checks for style errors.
333 It's meant for use together with `compile':
334 emacs -batch --eval "(checkdoc-file \"subr.el\")"
339 *** The desktop format version has been upgraded from 206 to 208.
340 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
341 cannot read a version 208 desktop. To upgrade your desktop file, you
342 must explicitly request the upgrade, by C-u M-x desktop-save. You are
343 recommended to do this as soon as you have firmly upgraded to Emacs
344 25.1 (or later). Should you ever need to downgrade your desktop file
345 to version 206, you can do this with C-u C-u M-x desktop-save.
348 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
349 It raises an error if a bookmark of that name already exists,
350 unlike `bookmark-set' which silently updates an existing bookmark.
355 *** `imap-ssl-program' has been removed, and imap.el uses the internal
356 GnuTLS encryption functions if possible.
361 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
362 the ordering of object keys by default.
365 *** New commands `json-pretty-print-ordered' and
366 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
367 object keys sorted alphabetically.
370 ** Prog mode has some support for multi-mode indentation.
371 This allows better indentation support in modes that support multiple
372 programming languages in the same buffer, like literate programming
373 environments or ANTLR programs with embedded Python code.
375 A major mode can provide indentation context for a sub-mode through
376 the `prog-indentation-context' variable. To support this, modes that
377 provide indentation should use `prog-widen' instead of `widen' and
378 `prog-first-column' instead of a literal zero. See the node
379 "Mode-Specific Indent" in the ELisp manual for more details.
381 ** Prettify Symbols mode
384 *** Prettify Symbols mode supports custom composition predicates. By
385 overriding the default `prettify-symbols-compose-predicate', modes can
386 specify in which contexts a symbol may be displayed as some Unicode
387 character. `prettify-symbols-default-compose-p' is the default which
388 is suitable for most programming languages such as C or Lisp (but not
392 *** Symbols can be unprettified while point is inside them.
393 New variable `prettify-symbols-unprettify-at-point' configures this.
395 ** Enhanced xterm support
398 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
399 This variable tells Emacs which advanced capabilities are available in
400 the xterm terminal emulator used to display Emacs text-mode frames.
401 The default is to check each capability, and use it if available.
402 (This variable was introduced in Emacs 24.1, but was not announced in
406 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
407 in the surrounding GUI (using the OSC-52 escape sequence). This only works
408 if your xterm supports it and enables the `allowWindowOps' options (disabled
409 by default at least in Debian, for security reasons).
411 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
412 escape sequence) if your xterm has the feature enabled but for that you
413 additionally need to add `getSelection' to `xterm-extra-capabilities'.
416 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
419 ** The `save-place' variable is replaced by `save-place-mode'.
424 *** ERC can now hide message types by network or channel.
425 `erc-hide-list' will hide all messages of the specified type, while
426 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
427 specified message types for the respective specified targets.
432 *** `midnight-mode' is now a proper minor mode.
435 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
440 *** New "external" package status.
441 An external package is any installed package that's not built-in and
442 not from `package-user-dir', which usually means it's from an entry in
443 `package-directory-list'. They are treated much like built-in
444 packages, in that they cannot be deleted through the package menu and
445 are not considered for upgrades.
447 The effect is that a user can manually place a specific version of a
448 package inside `package-directory-list' and the package menu will
452 *** If a package is available on multiple archives and one has higher
453 priority (as per `package-archive-priorities') only that one is
454 listed. This can be configured with `package-menu-hide-low-priority'.
457 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
458 This includes the above-mentioned low-priority packages, as well as
459 available packages whose version is lower than the currently installed
460 version (which were previously impossible to display).
461 This allows users to downgrade a package if a lower version is
465 *** When filtering the package menu, keywords starting with "arc:" or
466 "status:" represent package archive or status, respectively, instead
470 *** Most functions which involve downloading information now take an
471 ASYNC argument. If it is non-nil, package.el performs the download(s)
475 *** New variable `package-menu-async' controls whether the
476 package-menu uses asynchronous downloads.
479 *** `package-install-from-buffer' and `package-install-file' work on directories.
480 This follows the same rules as installing from a .tar file, except the
481 -pkg file is optional.
484 *** Packages which are dependencies of other packages cannot be deleted.
485 The FORCE argument to `package-delete' overrides this.
488 *** New custom variable `package-selected-packages' tracks packages
489 which were installed by the user (as opposed to installed as
490 dependencies). This variable can also be manually customized.
493 *** New command `package-install-user-selected-packages' installs all
494 packages from `package-selected-packages' which are currently missing.
497 *** New command `package-autoremove' removes all packages which were
498 installed strictly as dependencies but are no longer needed.
503 When you invoke `shell' interactively, the *shell* buffer will now
504 display in a new window. However, you can customize this behavior via
505 the `display-buffer-alist' variable. For example, to get
506 the old behavior -- *shell* buffer displays in current window -- use
507 (add-to-list 'display-buffer-alist
508 '("^\\*shell\\*$" . (display-buffer-same-window))).
512 *** The `:protection' slot option is not obeyed any more.
514 *** The `newname' argument to constructors is optional&deprecated.
515 If you need your objects to be named, do it by inheriting from `eieio-named'.
517 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
519 *** The <class> variables are declared obsolete.
521 *** The <initarg> variables are declared obsolete.
522 *** defgeneric and defmethod are declared obsolete.
524 *** `constructor' is now an obsolete alias for `make-instance'.
529 *** New command `ido-bury-buffer-at-head' bound to C-S-b
530 Bury the buffer at the head of `ido-matches', analogous to how C-k
531 kills the buffer at head.
534 *** A prefix argument to `ido-restrict-to-matches' will reverse its
535 meaning, and the list is restricted to those elements that do not
536 match the current input.
541 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
542 The new commands `next-line-or-history-element' and
543 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
544 minibuffer, allow by-line movement through minibuffer history,
545 similarly to an ordinary buffer. Only when point moves over
546 the bottom/top of the minibuffer it goes to the next/previous history
547 element. `M-p' and `M-n' still move directly to previous/next history
550 ** Search and Replace
553 *** New user option `search-default-regexp-mode'
554 specifies the default mode for I-search.
557 *** `isearch' and `query-replace' can now perform character folding in matches.
558 Isearch does that by default, while `query-replace' will do that if
559 the new variable `replace-character-fold' is customized to a non-nil
560 value. This is analogous to case folding, but instead of disregarding
561 case variants, it disregards wider classes of distinctions between
562 similar characters. (Case folding is a special case of character
563 folding.) This means many characters in the search string will match
564 entire groups of characters instead of just themselves.
566 For instance, the " will match all variants of double quotes (like “
567 and ”), and the letter a will match all of its accented cousins, even
568 those composed of multiple characters, as well as many other symbols
572 *** New function `character-fold-to-regexp' can be used
573 by searching commands to produce a regexp matching anything that
574 character-folds into STRING.
577 *** The new M-s M-w key binding uses eww to search the web for the
578 text in the region. The search engine to use for this is specified by
579 the customizable variable `eww-search-prefix'.
582 *** Query-replace history is enhanced.
583 When query-replace reads the FROM string from the minibuffer, typing
584 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
585 and TO are the original text and its replacement, and SEP is an arrow
586 string defined by the new variable `query-replace-from-to-separator'.
587 To select a prior replacement, type `M-p' until the desired
588 replacement appears in the minibuffer, and then exit the minibuffer by
593 *** If `quick-calc' is called with a prefix argument, insert the
594 result of the calculation into the current buffer.
597 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
598 this you can tell Edebug not to stop at the start of the first
599 instrumented function.
604 *** New minor mode `global-eldoc-mode'
605 It is turned on by default, and affects `*scratch*' and other buffers
606 whose major mode supports Emacs Lisp.
609 *** `eldoc-documentation-function' now defaults to `ignore'
612 *** `describe-char-eldoc' displays information about character at point,
613 and can be used as a default value of `eldoc-documentation-function'. It is
614 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
615 ] [, ] [, etc.) while using mono-spaced font.
620 *** HTML can now be rendered using variable-width fonts.
623 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
624 whether to use variable-pitch fonts or not. The user can also
625 customize the `shr-use-fonts' variable.
628 *** A new command `R' (`eww-readable') will try do identify the main
629 textual parts of a web page and display only that, leaving menus and
630 the like off the page.
633 *** You can now use several eww buffers in parallel by renaming eww
634 buffers you want to keep separate.
637 *** Partial state of the eww buffers (the URIs and the titles of the
638 pages visited) is now preserved in the desktop file.
641 *** `eww-after-render-hook' is now called after eww has rendered
642 the data in the buffer.
645 *** The `eww-reload' command now takes a prefix to not reload via
646 the net, but just use the local copy of the HTML.
649 *** The DOM shr and eww uses has been changed to the general Emacs
650 xml.el/libxml2 DOM, and a new package dom.el has been added to
651 interact with this DOM. See the Emacs Lisp manual for interface
655 *** `mailcap-mime-data' is now consulted when displaying PDF files.
658 *** The new `S' command will list all eww buffers, and allow managing
662 *** https pages with valid certificates have headers marked in green, while
663 invalid certificates are marked in red.
668 *** text/html messages that contain inline image parts will be
669 transformed into multipart/related messages before sending.
672 ** In Show Paren Mode, a parenthesis can be highlighted when point
673 stands inside it, and certain parens can be highlighted when point is
674 at BOL or EOL, or in whitespace there. To enable these, customize,
675 respectively, `show-paren-when-point-inside-paren' or
676 `show-paren-when-point-in-periphery'.
681 *** Strings after `:documentation' are highlighted as docstrings.
682 This enhances Lisp mode fontification to handle documentation of the
683 form `(:documentation "the doc string")' used in Common Lisp code for
684 CLOS class and slot documentation.
689 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
692 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
693 *** `string-rectangle' provides on-the-fly preview of the result.
696 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
697 These should be used in preference to `font-lock-fontify-buffer' when
701 ** Macro `minibuffer-with-setup-hook' can optionally append a function
702 to `minibuffer-setup-hook'.
704 If the first argument of the macro is of the form `(:append FUN)',
705 then FUN will be appended to `minibuffer-setup-hook', instead of
710 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
712 ** Calendar and diary
715 *** The default `diary-file' is now located in .emacs.d.
718 *** New commands to insert diary entries with Chinese dates:
719 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
720 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
723 *** The calendar can now list and mark diary entries with Chinese dates.
724 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
727 *** The option `calendar-mode-line-format' can now be nil,
728 which means to do nothing special with the mode line in calendars.
731 *** New option `calendar-weekend-days'.
732 The option customizes which day headers receive the
733 `calendar-weekend-header' face.
736 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
739 *** Many items obsolete since at least version 23.1 have been removed.
740 The majority were function/variable/face aliases, too numerous to list here.
743 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
744 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
746 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
748 **** Macro `calendar-for-loop'.
750 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
752 **** The nil and list forms of `diary-display-function'.
755 ** New ERT function `ert-summarize-tests-batch-and-exit'.
756 If the output of ERT tests in batch mode execution can be saved to a
757 log file, then it can be passed as an argument to the above function
758 to produce a neat summary.
761 ** New js.el option `js-indent-first-init'.
766 ** Info mode now displays symbol names in fixed-pitch font.
767 If you want to get the old behavior back, customize the `Info-quoted'
768 face to use the same definitions as the default face.
771 *** `Info-fontify-maximum-menu-size' can be t for no limit.
774 *** `info-display-manual' can now be given a prefix argument which (any
775 non-nil value) directs the command to limit the completion
776 alternatives to currently visited manuals.
779 ** ntlm.el has support for NTLM2.
784 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
785 to delete or undelete multiple messages.
788 *** Rmail can now render HTML mail messages if your Emacs was built with
789 libxml2 or if you have the Lynx browser installed. By default, Rmail
790 will display the HTML version of a mail message that has both HTML and
791 plain text parts, if display of HTML email is possible; customize the
792 `rmail-mime-prefer-html' option to `nil' if you don't want that.
795 *** In the commands that make summaries by subject, recipients, or senders,
796 you can no longer use commas to separate regular expressions.
799 ** SES now supports local printer functions; see `ses-define-local-printer'.
803 *** In sh-mode you can now use `sh-shell' as a file-local variable to
804 specify the type of shell in use (bash, csh, etc).
807 *** New value `always' for `sh-indent-after-continuation'.
808 This provides old-style ("dumb") indentation of continued lines.
809 See the doc string of `sh-indent-after-continuation' for details.
813 *** Fatal TLS errors are now silent by default.
816 *** If Emacs isn't built with TLS support, an external TLS-capable
817 program is used instead. This program used to be run in --insecure
818 mode by default, but has now changed to be secure instead, and will
819 fail if you try to connect to non-verifiable hosts. This is
820 controlled by the `tls-program' variable.
825 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
826 When `url-handler-mode' is enabled, file operations for these
827 protocols as well as for "telnet" and "ftp" are passed to Tramp.
830 *** The URL package allows customizing the `url-user-agent' string.
831 The new `url-user-agent' variable can be customized to be a string or
835 *** The new interface variable `url-request-noninteractive' can be used
836 to specify that we're running in a noninteractive context, and that
837 we should not be queried about things like TLS certificate validity.
840 *** If URL is used with a https connection, the first callback argument
841 plist will contain a :peer element that has the output of
842 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
847 *** New connection method "afp", which allows to access Mac OS X
848 volumes via the Apple Filing Protocol.
851 *** New connection method "nc", which allows to access dumb busyboxes.
854 *** Method-specific parameters can be overwritten now with variable
855 `tramp-connection-properties'.
858 *** Handler for `file-notify-valid-p' for remote machines that support
859 filesystem notifications.
864 *** New user variable `sql-default-directory' enables remote
865 connections using Tramp.
868 *** New command `sql-send-line-and-next'.
869 This command, bound to `C-c C-n' by default, sends the current line to
870 the SQL process and advances to the next line, skipping whitespace and
874 *** Added support for Vertica SQL.
876 ** VC and related modes
879 *** Basic push support, via `vc-push', bound to `C-x v P'.
880 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
881 (undocumented) command vc-hg-push now behaves slightly differently.
884 *** The new command vc-region-history shows the log+diff of the active region.
887 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
888 This command is useful when you perform version control commands
889 outside Emacs (e.g., from the shell prompt), or if you switch the VC
890 back-end for the buffer's file, or remove it from version control.
893 *** New option `vc-annotate-background-mode' controls whether
894 the color range from `vc-annotate-color-map' is applied to the
895 background or to the foreground.
898 *** `compare-windows' now compares text with the most recently selected window
899 instead of the next window. If you want the previous behavior of
900 comparing with the next window, customize the new option
901 `compare-windows-get-window-function' to the value
902 `compare-windows-get-next-window'.
905 *** Two new faces `compare-windows-removed' and `compare-windows-added'
906 replace the face `compare-windows', which is now an obsolete alias for
907 `compare-windows-added'.
910 *** `log-edit-insert-changelog' converts "(tiny change)" to
911 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
915 ** VHDL mode now supports VHDL'08.
920 *** Decimal display mode uses "," groups, so it's more
921 fitting for use in money calculations
924 *** Factorial works with non-integer inputs.
929 *** Hide-IfDef mode now support full C/C++ expressions in macros,
930 macro argument expansion, interactive macro evaluation and automatic
931 scanning of #define'd symbols.
934 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
935 result of evaluating a macro.
938 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
939 all defined symbols in `hide-ifdef-env'.
942 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
943 file name patterns. Defaults to files whose extension is one of `.h',
944 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
947 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
948 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
949 (This could happen when an idempotent header file is visited again,
950 when its guard symbol is already defined.) Defaults to `t'.
953 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
954 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
955 looking for macro definitions. By default, no symbols are ignored.
960 *** New custom variable `tex-print-file-extension' to help users who
961 use PDF instead of DVI.
964 *** TeX mode now supports Prettify Symbols mode. When enabling
965 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
966 many other math macros are displayed using unicode characters.
969 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
970 By default, 32 consecutive spaces or four consecutive TABs are
971 considered to be too deep, but the new variable
972 `whitespace-big-indent-regexp' can be customized to change that.
975 ** New options in `tildify-mode'.
976 New options `tildify-space-string', `tildify-pattern', and
977 `tildify-foreach-region-function' variables make
978 `tildify-string-alist', `tildify-pattern-alist', and
979 `tildify-ignored-environments-alist' variables (as well as a few
980 helper functions) obsolete.
983 ** New package Xref replaces Etags's front-end and UI
985 The new package Xref provides a generic framework and new commands to
986 find and move to definitions of functions, macros, data structures
987 etc., as well as go back to the location where you were before moving
988 to a definition. It supersedes and obsoletes many Etags commands,
989 while still using the etags.el code that reads the TAGS tables as one
992 The command `xref-find-definitions' replaces `find-tag' and provides
993 an interface to pick one definition among several.
994 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
995 `pop-tag-mark', but has a keybinding (`M-,') different from the one
998 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
999 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1000 `xref-find-apropos' replaces `find-tag-regexp'.
1002 As a result of this, the following commands are now obsolete:
1003 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1006 `tags-loop-continue' is not obsolete because it's still useful in
1007 `tags-search' and `tags-query-replace', for which there are no direct
1013 `find-tag-marker-ring-length' is now an obsolete alias for
1014 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1015 alias for a private variable. `xref-push-marker-stack' and
1016 `xref-pop-marker-stack' should be used instead to manipulate the stack
1017 of searches for definitions.
1020 *** `xref-find-definitions' and `describe-function' now display
1021 information about mode local overrides (defined by cedet/mode-local.el
1022 `define-overloadable-function' `define-mode-local-overrides').
1024 The framework's Lisp API is still experimental and can change in major,
1025 backward-incompatible ways.
1028 ** New package Project
1030 The new package Project provides generic infrastructure for dealing
1031 with projects. The main commands included in it are
1032 `project-find-file' and `project-find-regexp'.
1034 The Lisp API of this package is still experimental.
1037 EUDC's LDAP backend has been improved.
1040 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1043 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1044 subprocess instead of on the command line.
1047 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1048 need to configure this manually anymore.
1051 *** The LDAP configuration section of EUDC's manual has been
1054 There have also been customization changes.
1057 *** New custom variable `eudc-server-hotlist' to allow specifying
1058 multiple EUDC servers in init file.
1061 *** Custom variable `eudc-inline-query-format' defaults to completing
1062 on email and firstname instead of surname.
1065 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1066 to avoid interfering with the kill ring.
1069 *** Custom variable `eudc-inline-expansion-format' defaults to
1070 "Firstname Surname <mail-address>".
1073 *** Custom variable `eudc-options-file' defaults to
1074 "~/.emacs.d/eudc-options".
1077 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1078 allow overriding the regular expression that recognizes the ldapsearch
1079 command line's password prompt.
1082 EUDC's BBDB backend now supports BBDB 3.
1085 EUDC's PH backend (eudcb-ph.el) is obsolete.
1090 *** The new built-in command `clear' can scroll window contents out of sight.
1091 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1094 *** New buffer syntax '#<buffer-name>', which is equivalent to
1095 '#<buffer buffer-name>'. This shorthand makes interacting with
1096 buffers from eshell more convenient. Custom variable
1097 `eshell-buffer-shorthand', which has been broken for a while, has been
1101 *** By default, eshell "visual" program buffers (created by
1102 `eshell-visual-commands' and similar custom vars) are no longer killed
1103 when their processes die. This fixes issues with short-lived commands
1104 and makes visual programs more useful in general. For example, if
1105 "git log" is a visual command, it will always show the visual command
1106 buffer, even if the "git log" process dies. For the old behavior,
1107 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1112 *** Support for the Conkeror web browser.
1115 *** Support for several ancient browsers is now officially obsolete.
1118 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1119 be added to the archive.
1122 ** Autorevert: dired buffers are also auto-reverted via file
1123 notifications, if Emacs is compiled with file notification support.
1125 ** File Notifications
1128 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1131 *** The new event `stopped' signals, that a file notification watch is
1132 not active any longer.
1135 *** The new function `file-notify-valid-p' checks, whether a file
1136 notification descriptor still corresponds to an activate watch.
1141 *** The command `dired-do-compress' bound to `Z' now can compress
1142 directories and decompress zip files.
1145 *** New command `dired-do-compress-to' bound to `c' can be used to
1146 compress many marked files into a single named archive. The
1147 compression command is determined from the new
1148 `dired-compress-files-alist' variable.
1150 ** Tabulated List Mode
1153 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1154 call `tabulated-list-init-header', in which case it will have no
1158 *** `tabulated-list-print' takes a second optional argument, update,
1159 which specifies an alternative printing method which is faster when
1160 few or no entries have changed.
1162 ** Obsolete packages
1168 *** landmark.el (moved to elpa.gnu.org)
1171 * New Modes and Packages in Emacs 25.1
1174 ** pinentry.el allows GnuPG passphrase to be prompted through the
1175 minibuffer instead of a graphical dialog, depending on whether the gpg
1176 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1177 is set). This feature requires newer versions of GnuPG (2.1.5 or
1178 later) and Pinentry (0.9.5 or later).
1180 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1183 ** scss-mode (a minor variant of css-mode)
1186 ** let-alist is a new macro (and a package) that allows one to easily
1187 let-bind the values stored in an alist.
1190 ** `tildify-mode' allows to automatically insert hard spaces as one
1191 types the text. Breaking line after a single-character words is
1192 forbidden by Czech and Polish typography (and may be discouraged in
1193 other languages), so `auto-tildify-mode' makes it easier to create
1194 a typographically-correct documents.
1197 ** The `seq' library adds sequence manipulation functions and macros
1198 that complement basic functions provided by subr.el. All functions
1199 are prefixed with `seq-' and work on lists, strings and vectors.
1202 ** The `map' library provides map-manipulation functions that work on
1203 alists, hash-table and arrays. All functions are prefixed with
1207 ** The `thunk' library provides functions and macros to control the
1208 evaluation of forms.
1211 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1212 support for JSX, an XML-like syntax extension to ECMAScript.
1215 * Incompatible Lisp Changes in Emacs 25.1
1218 ** `setq' and `setf' must now be called with an even number of
1219 arguments. The earlier behavior of silently supplying a nil to the
1220 last variable when there was an odd number of arguments has been
1224 ** `syntax-begin-function' is declared obsolete.
1225 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1226 slot in font-lock-defaults.
1229 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1230 called during startup. Users who call this function in their init
1231 file and still expect it to be run after startup should set
1232 `package-enable-at-startup' to t after the call to
1233 `package-initialize'.
1236 ** `:global' minor mode use `setq-default' rather than `setq'.
1237 This means that you can't use `make-local-variable' and expect them to
1238 "magically" become buffer-local.
1241 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1242 The `track-mouse' form no longer refrains from changing the shape of
1243 the mouse pointer for the entire time the body of that form is
1244 executed. Lisp programs that use `track-mouse' for dragging across
1245 large portions of the Emacs display, and want to avoid changes in the
1246 pointer shape during dragging, should bind the variable `track-mouse'
1247 to the special value `dragging' in the body of the form.
1250 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1251 has any effect. (This change was made in Emacs 24.4 but was not
1252 advertised at the time.)
1255 ** `indirect-function' does not signal `void-function' any more.
1256 This is mostly a bug-fix, since this change was missed back in 24.4 when
1257 symbol-function was changed not to signal `void-function' any more.
1260 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1263 ** Comint, term, and compile do not set the EMACS env var any more.
1264 Use the INSIDE_EMACS environment variable instead.
1267 ** `save-excursion' does not save&restore the mark any more.
1268 Use `save-mark-and-excursion' if you want the old behavior.
1271 ** `read-buffer' and `read-buffer-function' can now be called with a 4th
1272 argument (`predicate').
1275 ** `completion-table-dynamic' by default stays in the minibuffer.
1276 The minibuffer will be the current buffer when the function is called.
1277 If you want the old behavior of calling the function in the buffer
1278 from which the minibuffer was entered, use the new argument
1279 `switch-buffer' to `completion-table-dynamic'.
1282 ** window-configurations no longer record the buffers' marks.
1285 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1286 active region handling.
1289 ** deactivate-mark is now buffer-local.
1292 ** `cl-the' now asserts that its argument is of the given type.
1295 ** `process-running-child-p' may now return a numeric process
1296 group ID instead of `t'.
1299 ** Mouse click events on mode line or header line no longer include
1300 any reference to a buffer position. The 6th member of the mouse
1301 position list returned for such events is now nil.
1304 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1305 These slots used to hold key-shortcut data, but have been obsolete since
1309 ** Emacs no longer downcases the first letter of a system diagnostic
1310 when signaling a file error. For example, it now reports "Permission
1311 denied" instead of "permission denied". The old behavior was problematic
1312 in languages like German where downcasing rules depend on grammar.
1315 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1316 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1317 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1318 and apostrophe `like this'. The default value nil acts like ‘curve’
1319 if curved single quotes are displayable, and like ‘grave’ otherwise.
1320 The new variable affects display of diagnostics and help, but not of info.
1323 ** substitute-command-keys now replaces quotes.
1324 That is, it converts documentation strings’ quoting style as per the
1325 value of ‘text-quoting-style’. Doc strings in source code can use
1326 either curved single quotes or grave accents and apostrophes. As
1327 before, characters preceded by \= are output as-is.
1330 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1331 They use the new ‘format-message’ function instead of plain ‘format’,
1332 so that they now follow user preference as per ‘text-quoting-style’
1333 when processing curved single quotes, grave accents, and apostrophes
1334 in their format argument.
1337 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1338 now match multibyte characters using Unicode character properties.
1339 If you want the old behavior where they matched any character with
1340 word syntax, use `\sw' instead.
1343 ** The character classes [:graph:] and [:print:] in regular expressions
1344 no longer match every multibyte character. Instead, Emacs now
1345 consults the Unicode character properties to determine which
1346 characters are graphic or printable. In particular, surrogates and
1347 unassigned codepoints are now rejected. If you want the old behavior,
1348 use [:multibyte:] instead.
1351 ** The `diff' command uses the unified format now. To restore the old
1352 behavior, set `diff-switches' to `-c'.
1355 ** `grep-template' and `grep-find-template' values don't include the
1356 --color argument anymore. It's added at the <C> place holder position
1357 dynamically. Any third-party code that changes these templates should
1358 be updated accordingly.
1361 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1362 The new behavior is compatible with Common Lisp and with XEmacs.
1363 This change does not affect Lisp code intended to be portable to
1364 Emacs 24.2 and earlier, which did not support unary ‘/’.
1367 ** The `default-directory' value doesn't have to end slash. To make
1368 that happen, `unhandled-file-name-directory' now defaults to calling
1369 `file-name-as-directory'.
1372 * Lisp Changes in Emacs 25.1
1375 *** New UPatterns `quote', `app', `cl-struct', `eieio', `seq', and `map'.
1376 *** New UPatterns can be defined with `pcase-defmacro'.
1378 *** New vector QPattern.
1381 ** syntax-propertize is now automatically called on-demand during forward
1382 parsing functions like `forward-sexp'.
1385 ** New hooks `prefix-command-echo-keystrokes-functions' and
1386 `prefix-command-preserve-state-hook' allow the definition of prefix
1387 commands other than the predefined `C-u'.
1390 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1391 These allow to convert between buffer positions and the corresponding
1392 file byte offsets, given the file's encoding.
1395 ** The default value of `load-read-function' is now `read'.
1396 Previously, the default value of `nil' implied using `read'.
1399 ** New hook `pre-redisplay-functions'.
1400 It is a bit easier to use than `pre-redisplay-function'.
1403 ** The second arg of `looking-back' should always be provided explicitly.
1404 Previously, it was an optional argument, now it's mandatory.
1407 ** Text properties `intangible', `point-entered', and `point-left' are obsolete.
1408 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1409 implemented by the new `cursor-intangible-mode' and
1410 `cursor-sensor-mode' minor modes.
1413 ** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
1414 Use the new minor modes `cursor-intangible-mode' and
1415 `cursor-sensor-mode' instead.
1418 ** New process type `pipe', which can be used in combination with the
1419 `:stderr' keyword of make-process to handle standard error output
1423 ** New function `make-process' provides an alternative interface to
1424 `start-process'. It allows programs to set process parameters such as
1425 process filter, sentinel, etc., through keyword arguments (similar to
1426 `make-network-process').
1429 ** A new function `directory-files-recursively' returns all matching
1430 files (recursively) under a directory.
1433 ** New variable `inhibit-message', when bound to non-nil, inhibits
1434 `message' and related functions from displaying messages in the echo
1435 area. The output is still logged to the *Messages* buffer.
1438 ** A new text property `inhibit-read-only' can be used in read-only
1439 buffers to allow certain parts of the text to be writable.
1442 ** A new variable `comment-end-can-be-escaped' is useful in languages
1443 such as C and C++ where line comments with escaped newlines are
1444 continued to the next line.
1447 ** New macro `define-advice'.
1450 ** Emacs Lisp now supports generators.
1451 See the "Generators" section of the ELisp manual for the details.
1454 ** New finalizer facility for running code when objects become unreachable.
1455 See the "Finalizer Type" subsection in the ELisp manual for the
1459 ** lexical closures can use (:documentation FORM) to build their docstring.
1460 It should be placed right where the docstring would be, and FORM is then
1461 evaluated (and should return a string) when the closure is built.
1464 ** define-inline provides a new way to define inlinable functions.
1467 ** New function `macroexpand-1' to perform a single step of macro expansion.
1470 ** Some "x-*" functions were obsoleted and/or renamed:
1471 *** x-select-text is renamed gui-select-text.
1472 *** x-selection-value is renamed gui-selection-value.
1473 *** x-get-selection is renamed gui-get-selection.
1474 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1475 *** x-get-selection-value is renamed to gui-get-primary-selection.
1476 *** x-set-selection is renamed to gui-set-selection
1479 ** New function `string-greaterp', which return the opposite result of
1483 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1484 preserve the collation order as defined by the system's locale(1)
1485 environment. For the time being this is implemented for modern POSIX
1486 systems and for MS-Windows, for other systems they fall back to their
1487 counterparts `string-lessp' and `string-equal'.
1490 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1491 If you want the old, locale-independent sorting, customize the new
1492 option `ls-lisp-use-string-collate' to a nil value.
1495 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1496 if set to a non-nil value, causes the above 2 functions to ignore
1497 symbol and punctuation characters when collating strings. This
1498 emulates the behavior of modern Posix platforms when the locale's
1499 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1500 MS-Windows doesn't support UTF-8 as codeset in its locales.
1503 ** New function `alist-get', which is also a valid place (aka lvalue).
1506 ** New function `funcall-interactively', which works like `funcall'
1507 but makes `called-interactively-p' treat the function as (you guessed it)
1508 called interactively.
1511 ** New function `function-put' to use instead of `put' for function properties.
1514 ** The new function `bidi-find-overridden-directionality' allows to
1515 find characters whose directionality was, perhaps maliciously,
1516 overridden by directional override control characters. Lisp programs
1517 can use this to detect potential phishing of URLs and other links that
1518 exploits bidirectional display reordering.
1521 ** The new function `buffer-substring-with-bidi-context' allows to
1522 copy a portion of a buffer into a different location while preserving
1523 the visual appearance both of the copied text and the text at
1524 destination, even when the copied text includes mixed bidirectional
1525 text and directional control characters.
1528 ** New properties that can be specified with `declare':
1529 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1530 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1531 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1535 ** New macro `with-file-modes', for evaluating expressions with default file
1536 permissions set to temporary values (e.g., for creating private files).
1539 ** You can access the slots of structures using `cl-struct-slot-value'.
1542 ** Function `sort' can deal with vectors.
1545 ** Function `system-name' now returns an updated value if the current
1546 system's name has changed or if the Emacs process has changed systems,
1547 and to avoid long waits it no longer consults DNS to canonicalize the
1548 name. The variable `system-name' is now obsolete.
1551 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1554 ** If `pwd' is called with a prefix argument, insert the current default
1558 ** New functions return extended information about fonts and faces.
1561 *** The function `font-info' now returns more details about a font.
1562 In particular, it now returns the average width of the font's
1563 characters, which can be used for geometry-related calculations.
1566 *** A new function `default-font-width' returns the average width of a
1567 character in the current buffer's default font. If the default face
1568 is remapped (see `face-remapping-alist'), the value for the remapped
1569 face is returned. This function complements the existing function
1570 `default-font-height'.
1573 *** New functions `window-font-height' and `window-font-width' return
1574 the height and average width of characters in a specified face and
1575 window. If FACE is remapped (see `face-remapping-alist'), the
1576 function returns the information for the remapped face.
1579 *** A new function `window-max-chars-per-line' returns the maximal
1580 number of characters that can be displayed on one line. If a face
1581 and/or window are provided, these values are used for the
1582 calculation. This function is different from `window-body-width' in
1583 that it accounts for (i) continuation glyphs, (ii) the size of the
1584 font, and (iii) the specified window.
1587 ** New utilities in subr-x.el:
1588 *** New macros `if-let' and `when-let' allow defining bindings and to
1589 execute code depending whether all values are true.
1590 *** New macros `thread-first' and `thread-last' allow threading a form
1591 as the first or last argument of subsequent forms.
1594 ** Documentation strings now support quoting with curved single quotes
1595 ‘like-this’ in addition to the old style with grave accent and
1596 apostrophe `like-this'. The new style looks better on today's displays.
1597 In the new Electric Quote mode, you can enter curved single quotes
1598 into documentation by typing ` and '. Outside Electric Quote mode,
1599 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1600 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1601 ‘text-quoting-style’, the user can specify how to display doc string
1605 ** New function ‘format-message’ is like ‘format’ and also converts
1606 curved single quotes, grave accents and apostrophes as per
1607 ‘text-quoting-style’.
1610 ** show-help-function's arg is converted via substitute-command-keys
1611 before being passed to the function. Help strings, help-echo
1612 properties, etc. can therefore contain command key escapes and
1616 ** Time-related changes:
1618 *** Time conversion functions now accept an optional ZONE argument
1619 that specifies the time zone rules for conversion. ZONE is omitted or
1620 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1621 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1622 rule. The affected functions are ‘current-time-string’,
1623 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1624 function ‘encode-time’, which already accepted a simple time zone rule
1625 argument, has been extended to accept all the new forms.
1627 *** Time-related functions now consistently accept numbers
1628 (representing seconds since the epoch) and nil (representing the
1629 current time) as well as the usual list-of-integer representation.
1630 Affected functions include `current-time-string', `current-time-zone',
1631 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1632 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1633 `time-to-days', and `time-to-seconds'.
1635 *** The `encode-time-value' and `with-decoded-time-value' macros have
1638 *** `calendar-next-time-zone-transition', `time-add', and
1639 `time-subtract' no longer return time values in the obsolete and
1640 undocumented integer-pair format. Instead, they return a list of two
1644 ** New function `set-binary-mode' allows to switch a standard stream
1645 of the Emacs process to binary I/O mode.
1648 ** The new function `directory-name-p' can be used to check whether a file
1649 name (as returned from, for instance, `file-name-all-completions') is
1650 a directory file name. It returns non-nil if the last character in
1651 the name is a directory separator character (forward slash on GNU and
1652 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1655 ** ASCII approximations to curved quotes are put in standard-display-table
1656 if the terminal cannot display curved quotes.
1659 ** Standard output and error streams now transliterate characters via
1660 standard-display-table, and encode output using locale-coding-system.
1661 To force a specific encoding, bind `coding-system-for-write' to the
1662 coding-system of your choice when invoking functions like `prin1' and
1666 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1669 ** New possible value for `system-type': `nacl'.
1670 This is used by Google's Native Client (NaCl).
1672 ** Miscellaneous name change
1675 For consistency with the usual Emacs spelling, the Lisp variable
1676 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1677 The old name should still work, as an obsolescent alias.
1679 ** Changes in Frame- and Window- Handling
1682 *** Emacs can now draw horizontal scroll bars on some platforms that
1683 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1684 Horizontal scroll bars are turned off by default.
1686 **** New function `horizontal-scroll-bars-available-p' telling whether
1687 horizontal scroll bars are available on the underlying system.
1689 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1690 bars on all existing and future frames.
1692 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1693 scroll bars on the selected frame.
1695 **** New frame parameters `horizontal-scroll-bars' and
1696 `scroll-bar-height' to set horizontal scroll bars and their height
1697 for individual frames and in `default-frame-alist'.
1699 **** New functions `frame-scroll-bar-height' and
1700 `window-scroll-bar-height' return the height of horizontal scroll
1701 bars on a specific frame or window.
1703 **** `set-window-scroll-bars' now accepts five parameters where the last
1704 two specify height and type of the window's horizontal scroll bar.
1706 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
1709 **** New buffer-local variables `horizontal-scroll-bar' and
1710 `scroll-bar-height'.
1713 *** New functions `frame-geometry' and `frame-edges' give access to a
1717 *** New functions `mouse-absolute-pixel-position' and
1718 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1722 *** The function `window-edges' now accepts three additional arguments to
1723 retrieve body, absolute and pixel edges of the window.
1726 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
1727 `window-inside-absolute-pixel-edges' have been renamed to respectively
1728 `window-body-edges', `window-body-pixel-edges' and
1729 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1732 *** New function `window-absolute-pixel-position' to get the screen
1733 coordinates of a visible buffer position.
1736 *** The height of a frame's menu and tool bar are no longer counted in the
1737 frame's text height. This means that the text height stands only for
1738 the height of the frame's root window plus that of the echo area (if
1739 present). This was already the behavior for frames with external tool
1740 and menu bars (like in the Gtk builds) but has now been extended to all
1744 *** Frames now do not necessarily preserve the number of columns or lines
1745 they display when setting default font, menu bar, fringe width, or
1746 scroll bars. In particular, maximized and fullscreen frames are
1747 conceptually never resized if such settings change. For fullheight and
1748 fullwidth frames, the behavior may depend on the toolkit used.
1749 **** New option `frame-inhibit-implied-resize' if non-nil, means that
1750 setting default font, menu bar, fringe width, or scroll bars of a
1751 specific frame does not resize that frame in order to preserve the
1752 number of columns or lines it displays.
1755 *** New function `window-preserve-size' allows to preserve the size of
1756 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1757 `temp-buffer-resize-mode' and `display-buffer'.
1760 *** New `display-buffer' action function `display-buffer-use-some-frame'.
1761 This displays the buffer in an existing frame other than the current
1762 frame, and allows the caller to specify a frame predicate to exclude
1766 *** New minor mode `window-divider-mode' and options
1767 `window-divider-default-places', `window-divider-default-bottom-width'
1768 and `window-divider-default-right-width'.
1771 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
1772 Those features have been deprecated in Gtk+ for a long time.
1777 *** etags no longer qualifies class members by default.
1779 By default, `etags' will not qualify class members for C-like
1780 object-oriented languages with their class names and namespaces, and
1781 will remove qualifications used explicitly in the code from the tag
1782 names it puts in TAGS files. This is so the etags.el back-end for
1783 `xref-find-definitions' is more accurate and produces less false
1786 Use --class-qualify (-Q) if you want the old default behavior of
1787 qualifying class members in C++, Java, and Objective C. Note that
1788 using -Q might make some class members become "unknown" to `M-.'
1789 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1790 qualified names by hand.
1793 *** New language Ruby
1795 Names of modules, classes, methods, and functions are tagged.
1796 Overloaded operators are also tagged.
1799 *** Improved support for Lua
1801 Etags now tags functions even if the "function" keyword follows some
1802 whitespace at line beginning.
1805 * Changes in Emacs 25.1 on Non-Free Operating Systems
1808 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1809 This includes the makefile.w32-in files in various subdirectories, and
1810 the support files. The file nt/configure.bat now just tells the user
1811 to use the procedure described in nt/INSTALL, by running the Posix
1812 `configure' script in the top-level directory.
1815 ** Building Emacs for MS-Windows requires at least Windows XP
1816 or Windows Server 2003. The built binaries still run on all versions
1817 of Windows starting with Windows 9X.
1820 ** Emacs running on MS-Windows now supports the daemon mode.
1823 ** The byte counts in etags-generated TAGS files are now the same on
1824 MS-Windows as they are on other platforms.
1827 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1828 Pass '--without-ns' to configure to create an X11 build, the old default.
1831 ** OS X 10.5 or older is no longer supported.
1834 ** OS X on PowerPC is no longer supported.
1837 ** New variable `ns-use-fullscreen-animation' controls animation for
1838 non-native NS fullscreen. The default is nil. Set to t to enable
1839 animation when entering and leaving fullscreen. For native OSX fullscreen
1843 ** The new function 'w32-application-type' returns the type of an
1844 MS-Windows application given the name of its executable program file.
1846 ** New variable `w32-pipe-buffer-size'.
1847 It can be used to tune the size of the buffer of pipes created for
1848 communicating with subprocesses, when the program run by a subprocess
1849 exhibits unusual buffering behavior. Default is zero, which lets the
1850 OS use its default size.
1853 ----------------------------------------------------------------------
1854 This file is part of GNU Emacs.
1856 GNU Emacs is free software: you can redistribute it and/or modify
1857 it under the terms of the GNU General Public License as published by
1858 the Free Software Foundation, either version 3 of the License, or
1859 (at your option) any later version.
1861 GNU Emacs is distributed in the hope that it will be useful,
1862 but WITHOUT ANY WARRANTY; without even the implied warranty of
1863 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1864 GNU General Public License for more details.
1866 You should have received a copy of the GNU General Public License
1867 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1873 paragraph-separate: "[
\f]*$"