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+.
38 Cairo drawing is an experimental feature in Emacs, and subject to
39 change in future releases.
42 ** New configure option --with-modules.
43 This enables support for loading dynamic modules; see below.
46 ** By default, Emacs no longer works on IRIX. We expect that Emacs
47 users are not affected by this, as SGI stopped supporting IRIX in
48 December 2013. If you are affected, please send a bug report. You
49 should be able to work around the problem either by porting the Emacs
50 undumping code to GCC under IRIX, or by configuring --with-wide-int,
51 or by sticking with Emacs 24.4.
54 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
55 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
56 since Emacs 24.4, and the other variants were undocumented and were
57 obstacles to maintenance and development. GC_MARK_STACK and its
58 related symbols have been removed from the C internals.
61 ** 'configure' now prefers gnustep-config when configuring GNUstep.
62 If gnustep-config is not available, the old heuristics are used.
65 ** 'configure' now prefers inotify to gfile for file notification,
66 unless gfile is explicitly requested via --with-file-notification='gfile'.
69 ** 'configure' detects the kqueue file notification library on *BSD
70 and Mac OS X machines.
73 ** The configure option '--with-pkg-config-prog' has been removed.
74 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
77 ** The configure option '--with-mmdf' has been removed.
78 It was no longer useful, as it relied on libraries that are no longer
79 supported, and its presence led to confusion during configuration.
80 This affects only the 'movemail' utility; Emacs itself can still
81 process MMDF-format files as before.
84 ** The configure option '--enable-silent-rules' is now the default,
85 and silent rules are now quieter. To get the old behavior where
86 'make' chatters a lot, configure with '--disable-silent-rules' or
87 build with 'make V=1'.
90 ** The configure option '--with-gameuser' now allows to specify a
91 group instead of a user if its argument is prefixed by ':' (a colon).
92 This will cause the game score files in ${localstatedir}/games/emacs
93 to be owned by that group, and the helper program for updating them to
94 be installed setgid. The option now defaults to the 'games' group.
97 ** The `grep-changelog' script (and its manual page) are no longer included.
98 It has no particular connection to Emacs and has not changed in years,
99 so if you want to use it, you can always take a copy from an older Emacs.
102 ** Emacs 25 comes with a new set of icons.
103 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
104 The old Emacs logo icons are available as `emacs23.png' in the same location.
107 ** New make target `check-expensive' to run additional tests.
108 This includes all tests which run via "make check", plus additional
109 tests which take more time to perform.
112 * Startup Changes in Emacs 25.1
115 ** When Emacs is given a file as a command line argument and
116 `initial-buffer-choice' is non-nil, display both the file and
117 `initial-buffer-choice'. When Emacs is given more than one file and
118 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
119 and *Buffer List*. This makes Emacs convenient to use from the
120 command line when `initial-buffer-choice' is non-nil.
123 ** The value of ‘initial-scratch-message’ is now treated as a doc string
124 and can contain escape sequences for command keys, quotes, and the like.
127 * Changes in Emacs 25.1
129 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
130 If you have gtk3 and webkitgtk3 installed, you can access the
131 embedded webkit browser with `M-x xwidget-webkit-browse-url'. This
132 opens a new buffer with the embedded browser. The buffer will
133 have a new mode, `xwidget-webkit-mode' (similar to `image-mode'),
134 which supports the webkit widget.
136 *** New functions for xwidget-webkit mode `xwidget-webkit-insert-string',
137 `xwidget-webkit-adjust-size-dispatch', `xwidget-webkit-back',
138 `xwidget-webkit-browse-url', `xwidget-webkit-reload',
139 `xwidget-webkit-current-url', `xwidget-webkit-scroll-backward',
140 `xwidget-webkit-scroll-forward', `xwidget-webkit-scroll-down',
141 `xwidget-webkit-scroll-up'.
144 ** Emacs can now load shared/dynamic libraries (modules).
145 A dynamic Emacs module is a shared library that provides additional
146 functionality for use in Emacs Lisp programs, just like a package
147 written in Emacs Lisp would. The functions `load', `require',
148 `load-file', etc. were extended to load such modules, as they do with
149 Emacs Lisp packages. The new variable `module-file-suffix' holds the
150 system-dependent value of the file-name extension (`.so' on Posix
151 hosts) of the module files.
153 A module should export a C-callable function named
154 `emacs_module_init', which Emacs will call as part of the call to
155 `load' or `require' which loads the module. It should also export a
156 symbol named `plugin_is_GPL_compatible' to indicate that its code is
157 released under the GPL or compatible license; Emacs will refuse to
158 load modules that don't export such a symbol.
160 If a module needs to call Emacs functions, it should do so through the
161 API defined and documented in the header file `emacs-module.h'. Note
162 that any module that provides Lisp-callable functions will have to use
163 Emacs functions such as `fset' and `funcall', in order to register its
164 functions with the Emacs Lisp interpreter.
166 Modules can create `user-ptr' Lisp objects that embed pointers to C
167 struct's defined by the module. This is useful for keeping around
168 complex data structures created by a module, to be passed back to the
169 module's functions. User-ptr objects can also have associated
170 "finalizers" -- functions to be run when the object is GC'ed; this is
171 useful for freeing any resources allocated for the underlying data
172 structure, such as memory, open file descriptors, etc. A new
173 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
176 Loadable modules in Emacs are an experimental feature, and subject to
177 change in future releases. For that reason, their support is disabled
178 by default, and must be enabled by using the `--with-modules' option
182 ** Any file of the form .dir-locals*.el is now considered a dir-local
183 file, and multiple such files can be used in the same directory. See
184 the variable `dir-locals-file' for more information.
187 ** Network security (TLS/SSL certificate validity and the like) is
188 added via the new Network Security Manager (NSM) and controlled via
189 the `network-security-level' variable.
192 ** C-h l now also lists the commands that were run.
195 ** x-select-enable-clipboard is renamed select-enable-clipboard
196 and x-select-enable-primary is renamed select-enable-primary.
197 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
198 name it), with the proviso that on some systems (e.g. Windows)
199 select-enable-primary is ineffective since the system doesn't
200 have the equivalent of a primary selection.
203 ** New option `switch-to-buffer-in-dedicated-window' allows to customize
204 how `switch-to-buffer' proceeds interactively when the selected window
205 is strongly dedicated to its buffer.
208 ** The option `even-window-heights' has been renamed to
209 `even-window-sizes' and now handles window widths as well.
212 ** terpri gets an optional arg ENSURE to conditionally output a newline.
215 ** `insert-register' now leaves point after the inserted text
216 when called interactively. A prefix argument toggles this behavior.
219 ** The new variable `term-file-aliases' replaces some files from lisp/term.
220 The function `tty-run-terminal-initialization' consults this variable
221 when deciding what terminal-specific initialization code to run.
224 ** New variable `system-configuration-features', listing some of the
225 main features that Emacs was compiled with. This is mainly intended
226 for use in Emacs bug reports.
229 ** A password is now hidden also when typed in batch mode. Another
230 hiding character but the default `.' can be used by let-binding the
231 variable `read-hide-char'.
234 ** The Emacs pseudo-random number generator can be securely seeded.
235 On system where Emacs can access the system entropy or some other
236 cryptographically secure random stream, it now uses that when `random'
237 is called with its argument `t'. This allows cryptographically strong
238 random values; in particular, the Emacs server now uses this facility
239 to produce its authentication key.
242 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
245 * Editing Changes in Emacs 25.1
248 ** M-x suggests shorthands and ignores obsolete commands for completion.
253 *** Successive single-char deletions are collapsed in the undo-log just like
254 successive char insertions. Which commands invoke this behavior is
255 controlled by the new `undo-auto-amalgamate' function. See the node
256 "Undo" in the ELisp manual for more details.
259 *** The heuristic used to insert `undo-boundary' after each command
260 has changed, so that if a command causes changes in more than just the
261 current buffer, Emacs now calls `undo-boundary' in every buffer
262 affected by the command.
265 ** New command `comment-line' bound to `C-x C-;'.
267 ** New and improved facilities for inserting Unicode characters
270 *** Unicode names entered via C-x 8 RET now use substring completion by default.
273 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
274 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
277 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
278 as you type. See also the new variable ‘text-quoting-style’.
281 ** New minor mode global-eldoc-mode is enabled by default.
284 ** Emacs now supports "bracketed paste mode" when running on a terminal
285 that supports it. This facility allows Emacs to understand pasted
286 chunks of text as strings to be inserted, instead of interpreting each
287 character in the pasted text as actual user input. This results in a
288 paste experience similar to that under a window system, and significant
289 performance improvements when pasting large amounts of text.
292 ** Emacs now supports the latest version of the UBA.
293 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
294 was updated to support all the latest additions and changes introduced
295 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
296 This includes full support for directional isolates and the
297 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
301 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
304 ** New buffer-local `electric-pair-local-mode'.
307 ** New variable `fast-but-imprecise-scrolling' inhibits
308 fontification during full screen scrolling operations, giving less
309 hesitant operation during auto-repeat of C-v, M-v at the cost of
310 possible inaccuracies in the end position.
313 ** New documentation command `describe-symbol'.
314 Works for functions, variables, faces, etc. It is bound to `C-h o' by
318 ** New function `custom-prompt-customize-unsaved-options' checks for
319 unsaved customizations and prompts user to customize (if found). It
320 is intended for adding to 'kill-emacs-query-functions'.
323 * Changes in Specialized Modes and Packages in Emacs 25.1
328 *** New command `checkdoc-package-keywords' checks if the
329 current package keywords are recognized. Set the new option
330 `checkdoc-package-keywords-flag' to non-nil to make
331 `checkdoc-current-buffer' call this function automatically.
334 *** New function `checkdoc-file' checks for style errors.
335 It's meant for use together with `compile':
336 emacs -batch --eval "(checkdoc-file \"subr.el\")"
341 *** The desktop format version has been upgraded from 206 to 208.
342 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
343 cannot read a version 208 desktop. To upgrade your desktop file, you
344 must explicitly request the upgrade, by C-u M-x desktop-save. You are
345 recommended to do this as soon as you have firmly upgraded to Emacs
346 25.1 (or later). Should you ever need to downgrade your desktop file
347 to version 206, you can do this with C-u C-u M-x desktop-save.
350 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
351 It raises an error if a bookmark of that name already exists,
352 unlike `bookmark-set' which silently updates an existing bookmark.
357 *** `imap-ssl-program' has been removed, and imap.el uses the internal
358 GnuTLS encryption functions if possible.
363 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
364 the ordering of object keys by default.
367 *** New commands `json-pretty-print-ordered' and
368 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
369 object keys sorted alphabetically.
372 ** Prog mode has some support for multi-mode indentation.
373 This allows better indentation support in modes that support multiple
374 programming languages in the same buffer, like literate programming
375 environments or ANTLR programs with embedded Python code.
377 A major mode can provide indentation context for a sub-mode through
378 the `prog-indentation-context' variable. To support this, modes that
379 provide indentation should use `prog-widen' instead of `widen' and
380 `prog-first-column' instead of a literal zero. See the node
381 "Mode-Specific Indent" in the ELisp manual for more details.
383 ** Prettify Symbols mode
386 *** Prettify Symbols mode supports custom composition predicates. By
387 overriding the default `prettify-symbols-compose-predicate', modes can
388 specify in which contexts a symbol may be displayed as some Unicode
389 character. `prettify-symbols-default-compose-p' is the default which
390 is suitable for most programming languages such as C or Lisp (but not
394 *** Symbols can be unprettified while point is inside them.
395 New variable `prettify-symbols-unprettify-at-point' configures this.
397 ** Enhanced xterm support
400 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
401 This variable tells Emacs which advanced capabilities are available in
402 the xterm terminal emulator used to display Emacs text-mode frames.
403 The default is to check each capability, and use it if available.
404 (This variable was introduced in Emacs 24.1, but was not announced in
408 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
409 in the surrounding GUI (using the OSC-52 escape sequence). This only works
410 if your xterm supports it and enables the `allowWindowOps' options (disabled
411 by default at least in Debian, for security reasons).
413 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
414 escape sequence) if your xterm has the feature enabled but for that you
415 additionally need to add `getSelection' to `xterm-extra-capabilities'.
418 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
421 ** The `save-place' variable is replaced by `save-place-mode'.
426 *** ERC can now hide message types by network or channel.
427 `erc-hide-list' will hide all messages of the specified type, while
428 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
429 specified message types for the respective specified targets.
434 *** `midnight-mode' is now a proper minor mode.
437 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
442 *** New "external" package status.
443 An external package is any installed package that's not built-in and
444 not from `package-user-dir', which usually means it's from an entry in
445 `package-directory-list'. They are treated much like built-in
446 packages, in that they cannot be deleted through the package menu and
447 are not considered for upgrades.
449 The effect is that a user can manually place a specific version of a
450 package inside `package-directory-list' and the package menu will
454 *** If a package is available on multiple archives and one has higher
455 priority (as per `package-archive-priorities') only that one is
456 listed. This can be configured with `package-menu-hide-low-priority'.
459 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
460 This includes the above-mentioned low-priority packages, as well as
461 available packages whose version is lower than the currently installed
462 version (which were previously impossible to display).
463 This allows users to downgrade a package if a lower version is
467 *** When filtering the package menu, keywords starting with "arc:" or
468 "status:" represent package archive or status, respectively, instead
472 *** Most functions which involve downloading information now take an
473 ASYNC argument. If it is non-nil, package.el performs the download(s)
477 *** New variable `package-menu-async' controls whether the
478 package-menu uses asynchronous downloads.
481 *** `package-install-from-buffer' and `package-install-file' work on directories.
482 This follows the same rules as installing from a .tar file, except the
483 -pkg file is optional.
486 *** Packages which are dependencies of other packages cannot be deleted.
487 The FORCE argument to `package-delete' overrides this.
490 *** New custom variable `package-selected-packages' tracks packages
491 which were installed by the user (as opposed to installed as
492 dependencies). This variable can also be manually customized.
495 *** New command `package-install-user-selected-packages' installs all
496 packages from `package-selected-packages' which are currently missing.
499 *** New command `package-autoremove' removes all packages which were
500 installed strictly as dependencies but are no longer needed.
505 When you invoke `shell' interactively, the *shell* buffer will now
506 display in a new window. However, you can customize this behavior via
507 the `display-buffer-alist' variable. For example, to get
508 the old behavior -- *shell* buffer displays in current window -- use
509 (add-to-list 'display-buffer-alist
510 '("^\\*shell\\*$" . (display-buffer-same-window))).
514 *** The `:protection' slot option is not obeyed any more.
516 *** The `newname' argument to constructors is optional&deprecated.
517 If you need your objects to be named, do it by inheriting from `eieio-named'.
519 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
521 *** The <class> variables are declared obsolete.
523 *** The <initarg> variables are declared obsolete.
525 *** defgeneric and defmethod are declared obsolete.
526 Use the equivalent facilities from cl-generic.el instead.
528 *** `constructor' is now an obsolete alias for `make-instance'.
529 --- `pcase' accepts a new UPattern `eieio'.
534 *** New command `ido-bury-buffer-at-head' bound to C-S-b
535 Bury the buffer at the head of `ido-matches', analogous to how C-k
536 kills the buffer at head.
539 *** A prefix argument to `ido-restrict-to-matches' will reverse its
540 meaning, and the list is restricted to those elements that do not
541 match the current input.
546 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
547 The new commands `next-line-or-history-element' and
548 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
549 minibuffer, allow by-line movement through minibuffer history,
550 similarly to an ordinary buffer. Only when point moves over
551 the bottom/top of the minibuffer it goes to the next/previous history
552 element. `M-p' and `M-n' still move directly to previous/next history
555 ** Search and Replace
558 *** New user option `search-default-regexp-mode'
559 specifies the default mode for I-search.
562 *** `isearch' and `query-replace' can now perform character folding in matches.
563 Isearch does that by default, while `query-replace' will do that if
564 the new variable `replace-character-fold' is customized to a non-nil
565 value. This is analogous to case folding, but instead of disregarding
566 case variants, it disregards wider classes of distinctions between
567 similar characters. (Case folding is a special case of character
568 folding.) This means many characters in the search string will match
569 entire groups of characters instead of just themselves.
571 For instance, the " will match all variants of double quotes (like “
572 and ”), and the letter a will match all of its accented cousins, even
573 those composed of multiple characters, as well as many other symbols
577 *** New function `character-fold-to-regexp' can be used
578 by searching commands to produce a regexp matching anything that
579 character-folds into STRING.
582 *** The new M-s M-w key binding uses eww to search the web for the
583 text in the region. The search engine to use for this is specified by
584 the customizable variable `eww-search-prefix'.
587 *** Query-replace history is enhanced.
588 When query-replace reads the FROM string from the minibuffer, typing
589 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
590 and TO are the original text and its replacement, and SEP is an arrow
591 string defined by the new variable `query-replace-from-to-separator'.
592 To select a prior replacement, type `M-p' until the desired
593 replacement appears in the minibuffer, and then exit the minibuffer by
598 *** If `quick-calc' is called with a prefix argument, insert the
599 result of the calculation into the current buffer.
602 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
603 this you can tell Edebug not to stop at the start of the first
604 instrumented function.
609 *** New minor mode `global-eldoc-mode'
610 It is turned on by default, and affects `*scratch*' and other buffers
611 whose major mode supports Emacs Lisp.
614 *** `eldoc-documentation-function' now defaults to `ignore'
617 *** `describe-char-eldoc' displays information about character at point,
618 and can be used as a default value of `eldoc-documentation-function'. It is
619 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
620 ] [, ] [, etc.) while using mono-spaced font.
625 *** HTML can now be rendered using variable-width fonts.
628 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
629 whether to use variable-pitch fonts or not. The user can also
630 customize the `shr-use-fonts' variable.
633 *** A new command `R' (`eww-readable') will try do identify the main
634 textual parts of a web page and display only that, leaving menus and
635 the like off the page.
638 *** You can now use several eww buffers in parallel by renaming eww
639 buffers you want to keep separate.
642 *** Partial state of the eww buffers (the URIs and the titles of the
643 pages visited) is now preserved in the desktop file.
646 *** `eww-after-render-hook' is now called after eww has rendered
647 the data in the buffer.
650 *** The `eww-reload' command now takes a prefix to not reload via
651 the net, but just use the local copy of the HTML.
654 *** The DOM shr and eww uses has been changed to the general Emacs
655 xml.el/libxml2 DOM, and a new package dom.el has been added to
656 interact with this DOM. See the Emacs Lisp manual for interface
660 *** `mailcap-mime-data' is now consulted when displaying PDF files.
663 *** The new `S' command will list all eww buffers, and allow managing
667 *** https pages with valid certificates have headers marked in green, while
668 invalid certificates are marked in red.
673 *** text/html messages that contain inline image parts will be
674 transformed into multipart/related messages before sending.
677 ** In Show Paren Mode, a parenthesis can be highlighted when point
678 stands inside it, and certain parens can be highlighted when point is
679 at BOL or EOL, or in whitespace there. To enable these, customize,
680 respectively, `show-paren-when-point-inside-paren' or
681 `show-paren-when-point-in-periphery'.
686 *** Strings after `:documentation' are highlighted as docstrings.
687 This enhances Lisp mode fontification to handle documentation of the
688 form `(:documentation "the doc string")' used in Common Lisp code for
689 CLOS class and slot documentation.
694 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
697 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
698 *** `string-rectangle' provides on-the-fly preview of the result.
701 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
702 These should be used in preference to `font-lock-fontify-buffer' when
706 ** Macro `minibuffer-with-setup-hook' can optionally append a function
707 to `minibuffer-setup-hook'.
709 If the first argument of the macro is of the form `(:append FUN)',
710 then FUN will be appended to `minibuffer-setup-hook', instead of
715 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
718 *** `pcase' accepts the new UPattern `cl-struct'.
720 ** Calendar and diary
723 *** The default `diary-file' is now located in .emacs.d.
726 *** New commands to insert diary entries with Chinese dates:
727 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
728 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
731 *** The calendar can now list and mark diary entries with Chinese dates.
732 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
735 *** The option `calendar-mode-line-format' can now be nil,
736 which means to do nothing special with the mode line in calendars.
739 *** New option `calendar-weekend-days'.
740 The option customizes which day headers receive the
741 `calendar-weekend-header' face.
744 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
747 *** Many items obsolete since at least version 23.1 have been removed.
748 The majority were function/variable/face aliases, too numerous to list here.
751 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
752 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
754 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
756 **** Macro `calendar-for-loop'.
758 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
760 **** The nil and list forms of `diary-display-function'.
763 ** New ERT function `ert-summarize-tests-batch-and-exit'.
764 If the output of ERT tests in batch mode execution can be saved to a
765 log file, then it can be passed as an argument to the above function
766 to produce a neat summary.
769 ** New js.el option `js-indent-first-init'.
774 ** Info mode now displays symbol names in fixed-pitch font.
775 If you want to get the old behavior back, customize the `Info-quoted'
776 face to use the same definitions as the default face.
779 *** `Info-fontify-maximum-menu-size' can be t for no limit.
782 *** `info-display-manual' can now be given a prefix argument which (any
783 non-nil value) directs the command to limit the completion
784 alternatives to currently visited manuals.
787 ** ntlm.el has support for NTLM2.
792 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
793 to delete or undelete multiple messages.
796 *** Rmail can now render HTML mail messages if your Emacs was built with
797 libxml2 or if you have the Lynx browser installed. By default, Rmail
798 will display the HTML version of a mail message that has both HTML and
799 plain text parts, if display of HTML email is possible; customize the
800 `rmail-mime-prefer-html' option to `nil' if you don't want that.
803 *** In the commands that make summaries by subject, recipients, or senders,
804 you can no longer use commas to separate regular expressions.
807 ** SES now supports local printer functions; see `ses-define-local-printer'.
811 *** In sh-mode you can now use `sh-shell' as a file-local variable to
812 specify the type of shell in use (bash, csh, etc).
815 *** New value `always' for `sh-indent-after-continuation'.
816 This provides old-style ("dumb") indentation of continued lines.
817 See the doc string of `sh-indent-after-continuation' for details.
821 *** Fatal TLS errors are now silent by default.
824 *** If Emacs isn't built with TLS support, an external TLS-capable
825 program is used instead. This program used to be run in --insecure
826 mode by default, but has now changed to be secure instead, and will
827 fail if you try to connect to non-verifiable hosts. This is
828 controlled by the `tls-program' variable.
833 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
834 When `url-handler-mode' is enabled, file operations for these
835 protocols as well as for "telnet" and "ftp" are passed to Tramp.
838 *** The URL package allows customizing the `url-user-agent' string.
839 The new `url-user-agent' variable can be customized to be a string or
843 *** The new interface variable `url-request-noninteractive' can be used
844 to specify that we're running in a noninteractive context, and that
845 we should not be queried about things like TLS certificate validity.
848 *** If URL is used with a https connection, the first callback argument
849 plist will contain a :peer element that has the output of
850 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
855 *** New connection method "afp", which allows to access Mac OS X
856 volumes via the Apple Filing Protocol.
859 *** New connection method "nc", which allows to access dumb busyboxes.
862 *** Method-specific parameters can be overwritten now with variable
863 `tramp-connection-properties'.
866 *** Handler for `file-notify-valid-p' for remote machines that support
867 filesystem notifications.
872 *** New user variable `sql-default-directory' enables remote
873 connections using Tramp.
876 *** New command `sql-send-line-and-next'.
877 This command, bound to `C-c C-n' by default, sends the current line to
878 the SQL process and advances to the next line, skipping whitespace and
882 *** Added support for Vertica SQL.
884 ** VC and related modes
887 *** Basic push support, via `vc-push', bound to `C-x v P'.
888 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
889 (undocumented) command vc-hg-push now behaves slightly differently.
892 *** The new command vc-region-history shows the log+diff of the active region.
895 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
896 This command is useful when you perform version control commands
897 outside Emacs (e.g., from the shell prompt), or if you switch the VC
898 back-end for the buffer's file, or remove it from version control.
901 *** New option `vc-annotate-background-mode' controls whether
902 the color range from `vc-annotate-color-map' is applied to the
903 background or to the foreground.
906 *** `compare-windows' now compares text with the most recently selected window
907 instead of the next window. If you want the previous behavior of
908 comparing with the next window, customize the new option
909 `compare-windows-get-window-function' to the value
910 `compare-windows-get-next-window'.
913 *** Two new faces `compare-windows-removed' and `compare-windows-added'
914 replace the face `compare-windows', which is now an obsolete alias for
915 `compare-windows-added'.
918 *** `log-edit-insert-changelog' converts "(tiny change)" to
919 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
923 ** VHDL mode now supports VHDL'08.
928 *** Decimal display mode uses "," groups, so it's more
929 fitting for use in money calculations
932 *** Factorial works with non-integer inputs.
937 *** Hide-IfDef mode now support full C/C++ expressions in macros,
938 macro argument expansion, interactive macro evaluation and automatic
939 scanning of #define'd symbols.
942 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
943 result of evaluating a macro.
946 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
947 all defined symbols in `hide-ifdef-env'.
950 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
951 file name patterns. Defaults to files whose extension is one of `.h',
952 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
955 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
956 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
957 (This could happen when an idempotent header file is visited again,
958 when its guard symbol is already defined.) Defaults to `t'.
961 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
962 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
963 looking for macro definitions. By default, no symbols are ignored.
968 *** New custom variable `tex-print-file-extension' to help users who
969 use PDF instead of DVI.
972 *** TeX mode now supports Prettify Symbols mode. When enabling
973 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
974 many other math macros are displayed using unicode characters.
977 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
978 By default, 32 consecutive spaces or four consecutive TABs are
979 considered to be too deep, but the new variable
980 `whitespace-big-indent-regexp' can be customized to change that.
983 ** New options in `tildify-mode'.
984 New options `tildify-space-string', `tildify-pattern', and
985 `tildify-foreach-region-function' variables make
986 `tildify-string-alist', `tildify-pattern-alist', and
987 `tildify-ignored-environments-alist' variables (as well as a few
988 helper functions) obsolete.
991 ** New package Xref replaces Etags's front-end and UI
993 The new package Xref provides a generic framework and new commands to
994 find and move to definitions of functions, macros, data structures
995 etc., as well as go back to the location where you were before moving
996 to a definition. It supersedes and obsoletes many Etags commands,
997 while still using the etags.el code that reads the TAGS tables as one
1000 The command `xref-find-definitions' replaces `find-tag' and provides
1001 an interface to pick one definition among several.
1002 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
1003 `pop-tag-mark', but has a keybinding (`M-,') different from the one
1004 `pop-tag-mark' used.
1006 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
1007 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1008 `xref-find-apropos' replaces `find-tag-regexp'.
1010 As a result of this, the following commands are now obsolete:
1011 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1014 `tags-loop-continue' is not obsolete because it's still useful in
1015 `tags-search' and `tags-query-replace', for which there are no direct
1019 *** Variants of `tags-search' and `tags-query-replace' in Dired were also
1020 replaced by xref-style commands, see the "Dired" section below.
1025 `find-tag-marker-ring-length' is now an obsolete alias for
1026 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1027 alias for a private variable. `xref-push-marker-stack' and
1028 `xref-pop-marker-stack' should be used instead to manipulate the stack
1029 of searches for definitions.
1032 *** `xref-find-definitions' and `describe-function' now display
1033 information about mode local overrides (defined by cedet/mode-local.el
1034 `define-overloadable-function' `define-mode-local-overrides').
1036 The framework's Lisp API is still experimental and can change in major,
1037 backward-incompatible ways.
1040 ** New package Project
1042 The new package Project provides generic infrastructure for dealing
1043 with projects. The main commands included in it are
1044 `project-find-file' and `project-find-regexp'.
1046 The Lisp API of this package is still experimental.
1049 EUDC's LDAP backend has been improved.
1052 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1055 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1056 subprocess instead of on the command line.
1059 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1060 need to configure this manually anymore.
1063 *** The LDAP configuration section of EUDC's manual has been
1066 There have also been customization changes.
1069 *** New custom variable `eudc-server-hotlist' to allow specifying
1070 multiple EUDC servers in init file.
1073 *** Custom variable `eudc-inline-query-format' defaults to completing
1074 on email and firstname instead of surname.
1077 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1078 to avoid interfering with the kill ring.
1081 *** Custom variable `eudc-inline-expansion-format' defaults to
1082 "Firstname Surname <mail-address>".
1085 *** Custom variable `eudc-options-file' defaults to
1086 "~/.emacs.d/eudc-options".
1089 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1090 allow overriding the regular expression that recognizes the ldapsearch
1091 command line's password prompt.
1094 EUDC's BBDB backend now supports BBDB 3.
1097 EUDC's PH backend (eudcb-ph.el) is obsolete.
1102 *** The new built-in command `clear' can scroll window contents out of sight.
1103 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1106 *** New buffer syntax '#<buffer-name>', which is equivalent to
1107 '#<buffer buffer-name>'. This shorthand makes interacting with
1108 buffers from eshell more convenient. Custom variable
1109 `eshell-buffer-shorthand', which has been broken for a while, has been
1113 *** By default, eshell "visual" program buffers (created by
1114 `eshell-visual-commands' and similar custom vars) are no longer killed
1115 when their processes die. This fixes issues with short-lived commands
1116 and makes visual programs more useful in general. For example, if
1117 "git log" is a visual command, it will always show the visual command
1118 buffer, even if the "git log" process dies. For the old behavior,
1119 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1124 *** Support for the Google Chrome web browser.
1127 *** Support for the Conkeror web browser.
1130 *** Support for several ancient browsers is now officially obsolete.
1133 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1134 be added to the archive.
1137 ** Autorevert: dired buffers are also auto-reverted via file
1138 notifications, if Emacs is compiled with file notification support.
1140 ** File Notifications
1143 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1146 *** The new event `stopped' signals, that a file notification watch is
1147 not active any longer.
1150 *** The new function `file-notify-valid-p' checks, whether a file
1151 notification descriptor still corresponds to an activate watch.
1156 *** The command `dired-do-compress' bound to `Z' now can compress
1157 directories and decompress zip files.
1160 *** New command `dired-do-compress-to' bound to `c' can be used to
1161 compress many marked files into a single named archive. The
1162 compression command is determined from the new
1163 `dired-compress-files-alist' variable.
1166 *** New user interface for the `A' and `Q' commands.
1167 These keys, now bound to `dired-do-find-regexp' and
1168 `dired-do-find-regexp-and-replace', work similarly to `xref-find-apropos'
1169 and `xref-query-replace-in-results': they present the matches
1170 in the `*xref*' buffer and let you move through the matches. No need
1171 to use `tags-loop-continue' to resume the search or replace loop. The
1172 previous commands, `dired-do-search' and
1173 `dired-do-query-replace-regexp', are still available, but not bound to
1174 keys; rebind `A' and `Q' to invoke them if you want the old behavior
1175 back. We intend to obsolete the old commands in a future release.
1177 ** Tabulated List Mode
1180 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1181 call `tabulated-list-init-header', in which case it will have no
1185 *** `tabulated-list-print' takes a second optional argument, update,
1186 which specifies an alternative printing method which is faster when
1187 few or no entries have changed.
1189 ** Obsolete packages
1195 *** landmark.el (moved to elpa.gnu.org)
1198 * New Modes and Packages in Emacs 25.1
1201 ** pinentry.el allows GnuPG passphrase to be prompted through the
1202 minibuffer instead of a graphical dialog, depending on whether the gpg
1203 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1204 is set). This feature requires newer versions of GnuPG (2.1.5 or
1205 later) and Pinentry (0.9.5 or later).
1208 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1209 The main entry points are `cl-defgeneric' and `cl-defmethod'. See the
1210 node "Generic Functions" in the Emacs Lisp manual for more details.
1213 ** scss-mode (a minor variant of css-mode)
1216 ** let-alist is a new macro (and a package) that allows one to easily
1217 let-bind the values stored in an alist.
1220 ** `tildify-mode' allows to automatically insert hard spaces as one
1221 types the text. Breaking line after a single-character words is
1222 forbidden by Czech and Polish typography (and may be discouraged in
1223 other languages), so `auto-tildify-mode' makes it easier to create
1224 a typographically-correct documents.
1227 ** The `seq' library adds sequence manipulation functions and macros
1228 that complement basic functions provided by subr.el. All functions
1229 are prefixed with `seq-' and work on lists, strings and vectors.
1230 `pcase' accepts a new Upattern `seq'.
1233 ** The `map' library provides map-manipulation functions that work on
1234 alists, hash-table and arrays. All functions are prefixed with
1235 `map-'. `pcase' accepts a new UPattern `map'.
1238 ** The `thunk' library provides functions and macros to control the
1239 evaluation of forms.
1242 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1243 support for JSX, an XML-like syntax extension to ECMAScript.
1246 * Incompatible Lisp Changes in Emacs 25.1
1249 ** `setq' and `setf' must now be called with an even number of
1250 arguments. The earlier behavior of silently supplying a nil to the
1251 last variable when there was an odd number of arguments has been
1255 ** `syntax-begin-function' is declared obsolete.
1256 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1257 slot in font-lock-defaults.
1260 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1261 called during startup. Users who call this function in their init
1262 file and still expect it to be run after startup should set
1263 `package-enable-at-startup' to t after the call to
1264 `package-initialize'.
1267 ** `:global' minor mode use `setq-default' rather than `setq'.
1268 This means that you can't use `make-local-variable' and expect them to
1269 "magically" become buffer-local.
1272 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1273 The `track-mouse' form no longer refrains from changing the shape of
1274 the mouse pointer for the entire time the body of that form is
1275 executed. Lisp programs that use `track-mouse' for dragging across
1276 large portions of the Emacs display, and want to avoid changes in the
1277 pointer shape during dragging, should bind the variable `track-mouse'
1278 to the special value `dragging' in the body of the form.
1281 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1282 has any effect. (This change was made in Emacs 24.4 but was not
1283 advertised at the time.)
1286 ** `indirect-function' does not signal `void-function' any more.
1287 This is mostly a bug-fix, since this change was missed back in 24.4 when
1288 symbol-function was changed not to signal `void-function' any more.
1291 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1294 ** Comint, term, and compile do not set the EMACS env var any more.
1295 Use the INSIDE_EMACS environment variable instead.
1298 ** `save-excursion' does not save&restore the mark any more.
1299 Use `save-mark-and-excursion' if you want the old behavior.
1302 ** `read-buffer' and `read-buffer-function' can now be called with a 4th
1303 argument (`predicate').
1306 ** `completion-table-dynamic' by default stays in the minibuffer.
1307 The minibuffer will be the current buffer when the function is called.
1308 If you want the old behavior of calling the function in the buffer
1309 from which the minibuffer was entered, use the new argument
1310 `switch-buffer' to `completion-table-dynamic'.
1313 ** window-configurations no longer record the buffers' marks.
1316 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1317 active region handling.
1320 ** deactivate-mark is now buffer-local.
1323 ** `cl-the' now asserts that its argument is of the given type.
1326 ** `process-running-child-p' may now return a numeric process
1327 group ID instead of `t'.
1330 ** Mouse click events on mode line or header line no longer include
1331 any reference to a buffer position. The 6th member of the mouse
1332 position list returned for such events is now nil.
1335 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1336 These slots used to hold key-shortcut data, but have been obsolete since
1340 ** Emacs no longer downcases the first letter of a system diagnostic
1341 when signaling a file error. For example, it now reports "Permission
1342 denied" instead of "permission denied". The old behavior was problematic
1343 in languages like German where downcasing rules depend on grammar.
1346 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1347 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1348 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1349 and apostrophe `like this'. The default value nil acts like ‘curve’
1350 if curved single quotes are displayable, and like ‘grave’ otherwise.
1351 The new variable affects display of diagnostics and help, but not of info.
1354 ** substitute-command-keys now replaces quotes.
1355 That is, it converts documentation strings’ quoting style as per the
1356 value of ‘text-quoting-style’. Doc strings in source code can use
1357 either curved single quotes or grave accents and apostrophes. As
1358 before, characters preceded by \= are output as-is.
1361 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1362 They use the new ‘format-message’ function instead of plain ‘format’,
1363 so that they now follow user preference as per ‘text-quoting-style’
1364 when processing curved single quotes, grave accents, and apostrophes
1365 in their format argument.
1368 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1369 now match multibyte characters using Unicode character properties.
1370 If you want the old behavior where they matched any character with
1371 word syntax, use `\sw' instead.
1374 ** The character classes [:graph:] and [:print:] in regular expressions
1375 no longer match every multibyte character. Instead, Emacs now
1376 consults the Unicode character properties to determine which
1377 characters are graphic or printable. In particular, surrogates and
1378 unassigned codepoints are now rejected. If you want the old behavior,
1379 use [:multibyte:] instead.
1382 ** The `diff' command uses the unified format now. To restore the old
1383 behavior, set `diff-switches' to `-c'.
1386 ** `grep-template' and `grep-find-template' values don't include the
1387 --color argument anymore. It's added at the <C> place holder position
1388 dynamically. Any third-party code that changes these templates should
1389 be updated accordingly.
1392 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1393 The new behavior is compatible with Common Lisp and with XEmacs.
1394 This change does not affect Lisp code intended to be portable to
1395 Emacs 24.2 and earlier, which did not support unary ‘/’.
1398 ** The `default-directory' value doesn't have to end slash. To make
1399 that happen, `unhandled-file-name-directory' now defaults to calling
1400 `file-name-as-directory'.
1403 * Lisp Changes in Emacs 25.1
1407 *** New UPatterns `quote', `app'.
1409 *** New UPatterns can be defined with `pcase-defmacro'.
1411 *** New vector QPattern.
1414 ** syntax-propertize is now automatically called on-demand during forward
1415 parsing functions like `forward-sexp'.
1418 ** New hooks `prefix-command-echo-keystrokes-functions' and
1419 `prefix-command-preserve-state-hook' allow the definition of prefix
1420 commands other than the predefined `C-u'.
1423 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1424 These allow to convert between buffer positions and the corresponding
1425 file byte offsets, given the file's encoding.
1428 ** The default value of `load-read-function' is now `read'.
1429 Previously, the default value of `nil' implied using `read'.
1432 ** New hook `pre-redisplay-functions'.
1433 It is a bit easier to use than `pre-redisplay-function'.
1436 ** The second arg of `looking-back' should always be provided explicitly.
1437 Previously, it was an optional argument, now it's mandatory.
1440 ** Text properties `intangible', `point-entered', and `point-left' are obsolete.
1441 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1442 implemented by the new `cursor-intangible-mode' and
1443 `cursor-sensor-mode' minor modes.
1446 ** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
1447 Use the new minor modes `cursor-intangible-mode' and
1448 `cursor-sensor-mode' instead.
1451 ** New process type `pipe', which can be used in combination with the
1452 `:stderr' keyword of make-process to handle standard error output
1456 ** New function `make-process' provides an alternative interface to
1457 `start-process'. It allows programs to set process parameters such as
1458 process filter, sentinel, etc., through keyword arguments (similar to
1459 `make-network-process').
1462 ** A new function `directory-files-recursively' returns all matching
1463 files (recursively) under a directory.
1466 ** New variable `inhibit-message', when bound to non-nil, inhibits
1467 `message' and related functions from displaying messages in the echo
1468 area. The output is still logged to the *Messages* buffer.
1471 ** A new text property `inhibit-read-only' can be used in read-only
1472 buffers to allow certain parts of the text to be writable.
1475 ** A new variable `comment-end-can-be-escaped' is useful in languages
1476 such as C and C++ where line comments with escaped newlines are
1477 continued to the next line.
1480 ** New macro `define-advice'.
1483 ** Emacs Lisp now supports generators.
1484 See the "Generators" section of the ELisp manual for the details.
1487 ** New finalizer facility for running code when objects become unreachable.
1488 See the "Finalizer Type" subsection in the ELisp manual for the
1492 ** lexical closures can use (:documentation FORM) to build their docstring.
1493 It should be placed right where the docstring would be, and FORM is then
1494 evaluated (and should return a string) when the closure is built.
1497 ** define-inline provides a new way to define inlinable functions.
1500 ** New function `macroexpand-1' to perform a single step of macro expansion.
1503 ** Some "x-*" functions were obsoleted and/or renamed:
1504 *** x-select-text is renamed gui-select-text.
1505 *** x-selection-value is renamed gui-selection-value.
1506 *** x-get-selection is renamed gui-get-selection.
1507 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1508 *** x-get-selection-value is renamed to gui-get-primary-selection.
1509 *** x-set-selection is renamed to gui-set-selection
1512 ** New function `string-greaterp', which return the opposite result of
1516 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1517 preserve the collation order as defined by the system's locale(1)
1518 environment. For the time being this is implemented for modern POSIX
1519 systems and for MS-Windows, for other systems they fall back to their
1520 counterparts `string-lessp' and `string-equal'.
1523 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1524 If you want the old, locale-independent sorting, customize the new
1525 option `ls-lisp-use-string-collate' to a nil value.
1528 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1529 if set to a non-nil value, causes the above 2 functions to ignore
1530 symbol and punctuation characters when collating strings. This
1531 emulates the behavior of modern Posix platforms when the locale's
1532 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1533 MS-Windows doesn't support UTF-8 as codeset in its locales.
1536 ** New function `alist-get', which is also a valid place (aka lvalue).
1539 ** New function `funcall-interactively', which works like `funcall'
1540 but makes `called-interactively-p' treat the function as (you guessed it)
1541 called interactively.
1544 ** New function `function-put' to use instead of `put' for function properties.
1547 ** The new function `bidi-find-overridden-directionality' allows to
1548 find characters whose directionality was, perhaps maliciously,
1549 overridden by directional override control characters. Lisp programs
1550 can use this to detect potential phishing of URLs and other links that
1551 exploits bidirectional display reordering.
1554 ** The new function `buffer-substring-with-bidi-context' allows to
1555 copy a portion of a buffer into a different location while preserving
1556 the visual appearance both of the copied text and the text at
1557 destination, even when the copied text includes mixed bidirectional
1558 text and directional control characters.
1561 ** New properties that can be specified with `declare':
1562 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1563 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1564 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1568 ** New macro `with-file-modes', for evaluating expressions with default file
1569 permissions set to temporary values (e.g., for creating private files).
1572 ** You can access the slots of structures using `cl-struct-slot-value'.
1575 ** Function `sort' can deal with vectors.
1578 ** Function `system-name' now returns an updated value if the current
1579 system's name has changed or if the Emacs process has changed systems,
1580 and to avoid long waits it no longer consults DNS to canonicalize the
1581 name. The variable `system-name' is now obsolete.
1584 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1587 ** If `pwd' is called with a prefix argument, insert the current default
1591 ** New functions return extended information about fonts and faces.
1594 *** The function `font-info' now returns more details about a font.
1595 In particular, it now returns the average width of the font's
1596 characters, which can be used for geometry-related calculations.
1599 *** A new function `default-font-width' returns the average width of a
1600 character in the current buffer's default font. If the default face
1601 is remapped (see `face-remapping-alist'), the value for the remapped
1602 face is returned. This function complements the existing function
1603 `default-font-height'.
1606 *** New functions `window-font-height' and `window-font-width' return
1607 the height and average width of characters in a specified face and
1608 window. If FACE is remapped (see `face-remapping-alist'), the
1609 function returns the information for the remapped face.
1612 *** A new function `window-max-chars-per-line' returns the maximal
1613 number of characters that can be displayed on one line. If a face
1614 and/or window are provided, these values are used for the
1615 calculation. This function is different from `window-body-width' in
1616 that it accounts for (i) continuation glyphs, (ii) the size of the
1617 font, and (iii) the specified window.
1620 ** New utilities in subr-x.el:
1621 *** New macros `if-let' and `when-let' allow defining bindings and to
1622 execute code depending whether all values are true.
1623 *** New macros `thread-first' and `thread-last' allow threading a form
1624 as the first or last argument of subsequent forms.
1627 ** Documentation strings now support quoting with curved single quotes
1628 ‘like-this’ in addition to the old style with grave accent and
1629 apostrophe `like-this'. The new style looks better on today's displays.
1630 In the new Electric Quote mode, you can enter curved single quotes
1631 into documentation by typing ` and '. Outside Electric Quote mode,
1632 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1633 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1634 ‘text-quoting-style’, the user can specify how to display doc string
1638 ** New function ‘format-message’ is like ‘format’ and also converts
1639 curved single quotes, grave accents and apostrophes as per
1640 ‘text-quoting-style’.
1643 ** show-help-function's arg is converted via substitute-command-keys
1644 before being passed to the function. Help strings, help-echo
1645 properties, etc. can therefore contain command key escapes and
1649 ** Time-related changes:
1651 *** Time conversion functions now accept an optional ZONE argument
1652 that specifies the time zone rules for conversion. ZONE is omitted or
1653 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1654 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1655 rule. The affected functions are ‘current-time-string’,
1656 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1657 function ‘encode-time’, which already accepted a simple time zone rule
1658 argument, has been extended to accept all the new forms.
1660 *** Time-related functions now consistently accept numbers
1661 (representing seconds since the epoch) and nil (representing the
1662 current time) as well as the usual list-of-integer representation.
1663 Affected functions include `current-time-string', `current-time-zone',
1664 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1665 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1666 `time-to-days', and `time-to-seconds'.
1668 *** The `encode-time-value' and `with-decoded-time-value' macros have
1671 *** `calendar-next-time-zone-transition', `time-add', and
1672 `time-subtract' no longer return time values in the obsolete and
1673 undocumented integer-pair format. Instead, they return a list of two
1677 ** New function `set-binary-mode' allows to switch a standard stream
1678 of the Emacs process to binary I/O mode.
1681 ** The new function `directory-name-p' can be used to check whether a file
1682 name (as returned from, for instance, `file-name-all-completions') is
1683 a directory file name. It returns non-nil if the last character in
1684 the name is a directory separator character (forward slash on GNU and
1685 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1688 ** ASCII approximations to curved quotes are put in standard-display-table
1689 if the terminal cannot display curved quotes.
1692 ** Standard output and error streams now transliterate characters via
1693 standard-display-table, and encode output using locale-coding-system.
1694 To force a specific encoding, bind `coding-system-for-write' to the
1695 coding-system of your choice when invoking functions like `prin1' and
1699 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1702 ** New possible value for `system-type': `nacl'.
1703 This is used by Google's Native Client (NaCl).
1705 ** Miscellaneous name change
1708 For consistency with the usual Emacs spelling, the Lisp variable
1709 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1710 The old name should still work, as an obsolescent alias.
1712 ** Changes in Frame- and Window- Handling
1715 *** Emacs can now draw horizontal scroll bars on some platforms that
1716 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1717 Horizontal scroll bars are turned off by default.
1719 **** New function `horizontal-scroll-bars-available-p' telling whether
1720 horizontal scroll bars are available on the underlying system.
1722 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1723 bars on all existing and future frames.
1725 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1726 scroll bars on the selected frame.
1728 **** New frame parameters `horizontal-scroll-bars' and
1729 `scroll-bar-height' to set horizontal scroll bars and their height
1730 for individual frames and in `default-frame-alist'.
1732 **** New functions `frame-scroll-bar-height' and
1733 `window-scroll-bar-height' return the height of horizontal scroll
1734 bars on a specific frame or window.
1736 **** `set-window-scroll-bars' now accepts five parameters where the last
1737 two specify height and type of the window's horizontal scroll bar.
1739 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
1742 **** New buffer-local variables `horizontal-scroll-bar' and
1743 `scroll-bar-height'.
1746 *** New functions `frame-geometry' and `frame-edges' give access to a
1750 *** New functions `mouse-absolute-pixel-position' and
1751 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1755 *** The function `window-edges' now accepts three additional arguments to
1756 retrieve body, absolute and pixel edges of the window.
1759 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
1760 `window-inside-absolute-pixel-edges' have been renamed to respectively
1761 `window-body-edges', `window-body-pixel-edges' and
1762 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1765 *** New function `window-absolute-pixel-position' to get the screen
1766 coordinates of a visible buffer position.
1769 *** The height of a frame's menu and tool bar are no longer counted in the
1770 frame's text height. This means that the text height stands only for
1771 the height of the frame's root window plus that of the echo area (if
1772 present). This was already the behavior for frames with external tool
1773 and menu bars (like in the Gtk builds) but has now been extended to all
1777 *** Frames now do not necessarily preserve the number of columns or lines
1778 they display when setting default font, menu bar, fringe width, or
1779 scroll bars. In particular, maximized and fullscreen frames are
1780 conceptually never resized if such settings change. For fullheight and
1781 fullwidth frames, the behavior may depend on the toolkit used.
1782 **** New option `frame-inhibit-implied-resize' if non-nil, means that
1783 setting default font, menu bar, fringe width, or scroll bars of a
1784 specific frame does not resize that frame in order to preserve the
1785 number of columns or lines it displays.
1788 *** New function `window-preserve-size' allows to preserve the size of
1789 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1790 `temp-buffer-resize-mode' and `display-buffer'.
1793 *** New `display-buffer' action function `display-buffer-use-some-frame'.
1794 This displays the buffer in an existing frame other than the current
1795 frame, and allows the caller to specify a frame predicate to exclude
1799 *** New minor mode `window-divider-mode' and options
1800 `window-divider-default-places', `window-divider-default-bottom-width'
1801 and `window-divider-default-right-width'.
1804 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
1805 Those features have been deprecated in Gtk+ for a long time.
1810 *** etags no longer qualifies class members by default.
1812 By default, `etags' will not qualify class members for C-like
1813 object-oriented languages with their class names and namespaces, and
1814 will remove qualifications used explicitly in the code from the tag
1815 names it puts in TAGS files. This is so the etags.el back-end for
1816 `xref-find-definitions' is more accurate and produces less false
1819 Use --class-qualify (-Q) if you want the old default behavior of
1820 qualifying class members in C++, Java, and Objective C. Note that
1821 using -Q might make some class members become "unknown" to `M-.'
1822 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1823 qualified names by hand.
1826 *** New language Ruby
1828 Names of modules, classes, methods, and functions are tagged.
1829 Overloaded operators are also tagged.
1832 *** Improved support for Lua
1834 Etags now tags functions even if the "function" keyword follows some
1835 whitespace at line beginning.
1838 * Changes in Emacs 25.1 on Non-Free Operating Systems
1841 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1842 This includes the makefile.w32-in files in various subdirectories, and
1843 the support files. The file nt/configure.bat now just tells the user
1844 to use the procedure described in nt/INSTALL, by running the Posix
1845 `configure' script in the top-level directory.
1848 ** Building Emacs for MS-Windows requires at least Windows XP
1849 or Windows Server 2003. The built binaries still run on all versions
1850 of Windows starting with Windows 9X.
1853 ** Emacs running on MS-Windows now supports the daemon mode.
1856 ** The byte counts in etags-generated TAGS files are now the same on
1857 MS-Windows as they are on other platforms.
1860 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1861 Pass '--without-ns' to configure to create an X11 build, the old default.
1864 ** OS X 10.5 or older is no longer supported.
1867 ** OS X on PowerPC is no longer supported.
1870 ** New variable `ns-use-fullscreen-animation' controls animation for
1871 non-native NS fullscreen. The default is nil. Set to t to enable
1872 animation when entering and leaving fullscreen. For native OSX fullscreen
1876 ** The new function 'w32-application-type' returns the type of an
1877 MS-Windows application given the name of its executable program file.
1879 ** New variable `w32-pipe-buffer-size'.
1880 It can be used to tune the size of the buffer of pipes created for
1881 communicating with subprocesses, when the program run by a subprocess
1882 exhibits unusual buffering behavior. Default is zero, which lets the
1883 OS use its default size.
1886 ----------------------------------------------------------------------
1887 This file is part of GNU Emacs.
1889 GNU Emacs is free software: you can redistribute it and/or modify
1890 it under the terms of the GNU General Public License as published by
1891 the Free Software Foundation, either version 3 of the License, or
1892 (at your option) any later version.
1894 GNU Emacs is distributed in the hope that it will be useful,
1895 but WITHOUT ANY WARRANTY; without even the implied warranty of
1896 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1897 GNU General Public License for more details.
1899 You should have received a copy of the GNU General Public License
1900 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1906 paragraph-separate: "[
\f]*$"