1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2014-2016 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 If possible, use M-x report-emacs-bug.
9 This file is about changes in Emacs version 25.
11 See file HISTORY for a list of GNU Emacs versions and release dates.
12 See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
13 and NEWS.1-17 for changes in older Emacs versions.
15 You can narrow news to a specific version by calling `view-emacs-news'
16 with a prefix argument or by typing C-u C-h C-n.
19 +++ indicates that all necessary documentation updates are complete.
20 (This means all relevant manuals in doc/ AND lisp doc-strings.)
21 --- means no change in the manuals is needed.
22 When you add a new item, use the appropriate mark if you are sure it applies,
23 otherwise leave it unmarked.
26 * Installation Changes in Emacs 25.2
29 * Startup Changes in Emacs 25.2
32 * Changes in Emacs 25.2
34 ** It is possible to disable attempted recovery on fatal signals
36 Two new variables allow to disable attempts to recover from stack
37 overflow and to avoid automatic auto-save when Emacs is delivered a
38 fatal signal. `attempt-stack-overflow-recovery', if set to `nil',
39 will disable attempts to recover from C stack overflows; Emacs will
40 then crash as with any other fatal signal.
41 `attempt-orderly-shutdown-on-fatal-signal', if set to `nil', will
42 disable attempts to auto-save the session and shut down in an orderly
43 fashion when Emacs receives a fatal signal; instead, Emacs will
44 terminate immediately. Both variables are non-`nil' by default.
45 These variables are for users who would like to avoid the small
46 probability of data corruption due to techniques Emacs uses to recover
50 * Editing Changes in Emacs 25.2
53 * Changes in Specialized Modes and Packages in Emacs 25.2
56 ** Support for non-string values of `time-stamp-format' has been removed.
60 *** New connection method "sg", which allows to edit files under
64 * New Modes and Packages in Emacs 25.2
67 * Incompatible Lisp Changes in Emacs 25.2
70 * Lisp Changes in Emacs 25.2
72 ** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
74 ** Autoload files can be generated without timestamps,
75 by setting `autoload-timestamps' to nil.
78 * Changes in Emacs 25.2 on Non-Free Operating Systems
81 * Installation Changes in Emacs 25.1
84 ** Building Emacs now requires C99 or later.
87 ** Building Emacs now requires GNU make, version 3.81 or later.
90 ** New configure option --with-cairo.
91 This builds Emacs with Cairo drawing. As a side effect, it provides
92 support for built-in printing, when Emacs was built with GTK+.
93 Cairo drawing is an experimental feature in Emacs, and subject to
94 change in future releases.
97 ** New configure option --with-modules.
98 This enables support for loading dynamic modules; see below.
101 ** By default, Emacs no longer works on IRIX. We expect that Emacs
102 users are not affected by this, as SGI stopped supporting IRIX in
103 December 2013. If you are affected, please send a bug report. You
104 should be able to work around the problem either by porting the Emacs
105 undumping code to GCC under IRIX, or by configuring --with-wide-int,
106 or by sticking with Emacs 24.4.
109 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
110 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
111 since Emacs 24.4, and the other variants were undocumented and were
112 obstacles to maintenance and development. GC_MARK_STACK and its
113 related symbols have been removed from the C internals.
116 ** 'configure' now prefers gnustep-config when configuring GNUstep.
117 If gnustep-config is not available, the old heuristics are used.
120 ** 'configure' now prefers inotify to gfile for file notification,
121 unless gfile is explicitly requested via --with-file-notification='gfile'.
124 ** 'configure' detects the kqueue file notification library on *BSD
125 and Mac OS X machines.
128 ** The configure option '--with-pkg-config-prog' has been removed.
129 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
132 ** The configure option '--with-mmdf' has been removed.
133 It was no longer useful, as it relied on libraries that are no longer
134 supported, and its presence led to confusion during configuration.
135 This affects only the 'movemail' utility; Emacs itself can still
136 process MMDF-format files as before.
139 ** The configure option '--enable-silent-rules' is now the default,
140 and silent rules are now quieter. To get the old behavior where
141 'make' chatters a lot, configure with '--disable-silent-rules' or
142 build with 'make V=1'.
145 ** The configure option '--with-gameuser' now allows you to specify a
146 group instead of a user if its argument is prefixed by ':' (a colon).
147 This will cause the game score files in ${localstatedir}/games/emacs
148 to be owned by that group, and the helper program for updating them to
149 be installed setgid. The option now defaults to the 'games' group.
152 ** The `grep-changelog' script (and its manual page) are no longer included.
153 It has no particular connection to Emacs and has not changed in years,
154 so if you want to use it, you can always take a copy from an older Emacs.
157 ** Emacs 25 comes with a new set of icons.
158 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
159 The old Emacs logo icons are available as `emacs23.png' in the same location.
162 ** New make target `check-expensive' to run additional tests.
163 This includes all tests which run via "make check", plus additional
164 tests which take more time to perform.
167 * Startup Changes in Emacs 25.1
170 ** When Emacs is given a file as a command line argument and
171 `initial-buffer-choice' is non-nil, display both the file and
172 `initial-buffer-choice'. When Emacs is given more than one file and
173 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
174 and *Buffer List*. This makes Emacs convenient to use from the
175 command line when `initial-buffer-choice' is non-nil.
178 ** The value of ‘initial-scratch-message’ is now treated as a doc string
179 and can contain escape sequences for command keys, quotes, and the like.
182 * Changes in Emacs 25.1
185 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
186 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
187 xwidget support, you can access the embedded webkit browser with `M-x
188 xwidget-webkit-browse-url'. This opens a new buffer with the embedded
189 browser. The buffer will have a new mode, `xwidget-webkit-mode'
190 (similar to `image-mode'), which supports the webkit widget.
193 *** New functions for xwidget-webkit mode `xwidget-webkit-insert-string',
194 `xwidget-webkit-adjust-size-dispatch', `xwidget-webkit-back',
195 `xwidget-webkit-browse-url', `xwidget-webkit-reload',
196 `xwidget-webkit-current-url', `xwidget-webkit-scroll-backward',
197 `xwidget-webkit-scroll-forward', `xwidget-webkit-scroll-down',
198 `xwidget-webkit-scroll-up'.
201 ** Emacs can now load shared/dynamic libraries (modules).
202 A dynamic Emacs module is a shared library that provides additional
203 functionality for use in Emacs Lisp programs, just like a package
204 written in Emacs Lisp would. The functions `load', `require',
205 `load-file', etc. were extended to load such modules, as they do with
206 Emacs Lisp packages. The new variable `module-file-suffix' holds the
207 system-dependent value of the file-name extension (`.so' on Posix
208 hosts) of the module files.
210 A module should export a C-callable function named
211 `emacs_module_init', which Emacs will call as part of the call to
212 `load' or `require' which loads the module. It should also export a
213 symbol named `plugin_is_GPL_compatible' to indicate that its code is
214 released under the GPL or compatible license; Emacs will refuse to
215 load modules that don't export such a symbol.
217 If a module needs to call Emacs functions, it should do so through the
218 API defined and documented in the header file `emacs-module.h'. Note
219 that any module that provides Lisp-callable functions will have to use
220 Emacs functions such as `fset' and `funcall', in order to register its
221 functions with the Emacs Lisp interpreter.
223 Modules can create `user-ptr' Lisp objects that embed pointers to C
224 struct's defined by the module. This is useful for keeping around
225 complex data structures created by a module, to be passed back to the
226 module's functions. User-ptr objects can also have associated
227 "finalizers" -- functions to be run when the object is GC'ed; this is
228 useful for freeing any resources allocated for the underlying data
229 structure, such as memory, open file descriptors, etc. A new
230 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
233 Loadable modules in Emacs are an experimental feature, and subject to
234 change in future releases. For that reason, their support is disabled
235 by default, and must be enabled by using the `--with-modules' option
239 ** A second dir-local file (.dir-locals-2.el) is now accepted.
240 See the variable `dir-locals-file-2' for more information.
243 ** Network security (TLS/SSL certificate validity and the like) is
244 added via the new Network Security Manager (NSM) and controlled via
245 the `network-security-level' variable.
248 ** International domain names (IDNA) are now encoded via the new
249 puny.el library, so that one can visit web sites like
250 "http://méxico.icom.museum".
253 ** C-h l now also lists the commands that were run.
255 ** The new M-s M-w key binding uses eww to search the web for the
258 ** M-x suggests shorthands and ignores obsolete commands for completion.
259 ** x-select-enable-clipboard is renamed select-enable-clipboard.
260 x-select-enable-primary and renamed select-enable-primary.
261 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
262 name it), with the proviso that on some systems (e.g. Windows)
263 select-enable-primary is ineffective since the system doesn't
264 have the equivalent of a primary selection.
267 ** New option `switch-to-buffer-in-dedicated-window' allows you to
268 customize how `switch-to-buffer' proceeds interactively when the
269 selected window is strongly dedicated to its buffer.
272 ** The option `even-window-heights' has been renamed to
273 `even-window-sizes' and now handles window widths as well.
276 ** terpri gets an optional arg ENSURE to conditionally output a newline.
279 ** `insert-register' now leaves point after the inserted text
280 when called interactively. A prefix argument toggles this behavior.
283 ** The new variable `term-file-aliases' replaces some files from lisp/term.
284 The function `tty-run-terminal-initialization' consults this variable
285 when deciding what terminal-specific initialization code to run.
288 ** New variable `system-configuration-features', listing some of the
289 main features that Emacs was compiled with. This is mainly intended
290 for use in Emacs bug reports.
293 ** A password is now hidden also when typed in batch mode. Another
294 hiding character but the default `.' can be used by let-binding the
295 variable `read-hide-char'.
298 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
301 * Editing Changes in Emacs 25.1
304 ** M-x suggests shorthands and ignores obsolete commands for completion.
309 *** Successive single-char deletions are collapsed in the undo-log just like
310 successive char insertions. Which commands invoke this behavior is
311 controlled by the new `undo-auto-amalgamate' function. See the node
312 "Undo" in the ELisp manual for more details.
315 *** The heuristic used to insert `undo-boundary' after each command
316 has changed, so that if a command causes changes in more than just the
317 current buffer, Emacs now calls `undo-boundary' in every buffer
318 affected by the command.
321 ** New command `comment-line' bound to `C-x C-;'.
323 ** New and improved facilities for inserting Unicode characters
326 *** Unicode names entered via C-x 8 RET now use substring completion by default.
329 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
330 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
333 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
334 as you type. See also the new variable ‘text-quoting-style’.
337 ** New minor mode global-eldoc-mode is enabled by default.
340 ** Emacs now supports "bracketed paste mode" when running on a terminal
341 that supports it. This facility allows Emacs to understand pasted
342 chunks of text as strings to be inserted, instead of interpreting each
343 character in the pasted text as actual user input. This results in a
344 paste experience similar to that under a window system, and significant
345 performance improvements when pasting large amounts of text.
348 ** Emacs now supports the latest version of the UBA.
349 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
350 was updated to support all the latest additions and changes introduced
351 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
352 This includes full support for directional isolates and the
353 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
357 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
360 ** New buffer-local `electric-pair-local-mode'.
363 ** New variable `fast-but-imprecise-scrolling' inhibits
364 fontification during full screen scrolling operations, giving less
365 hesitant operation during auto-repeat of C-v, M-v at the cost of
366 possible inaccuracies in the end position.
369 ** New documentation command `describe-symbol'.
370 Works for functions, variables, faces, etc. It is bound to `C-h o' by
374 ** New function `custom-prompt-customize-unsaved-options' checks for
375 unsaved customizations and prompts user to customize (if found). It
376 is intended for adding to 'kill-emacs-query-functions'.
379 * Changes in Specialized Modes and Packages in Emacs 25.1
384 *** New command `checkdoc-package-keywords' checks if the
385 current package keywords are recognized. Set the new option
386 `checkdoc-package-keywords-flag' to non-nil to make
387 `checkdoc-current-buffer' call this function automatically.
390 *** New function `checkdoc-file' checks for style errors.
391 It's meant for use together with `compile':
392 emacs -batch --eval "(checkdoc-file \"subr.el\")"
397 *** The desktop format version has been upgraded from 206 to 208.
398 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
399 cannot read a version 208 desktop. To upgrade your desktop file, you
400 must explicitly request the upgrade, by C-u M-x desktop-save. You are
401 recommended to do this as soon as you have firmly upgraded to Emacs
402 25.1 (or later). Should you ever need to downgrade your desktop file
403 to version 206, you can do this with C-u C-u M-x desktop-save.
406 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
407 It raises an error if a bookmark of that name already exists,
408 unlike `bookmark-set' which silently updates an existing bookmark.
413 *** `imap-ssl-program' has been removed, and imap.el uses the internal
414 GnuTLS encryption functions if possible.
419 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
420 the ordering of object keys by default.
423 *** New commands `json-pretty-print-ordered' and
424 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
425 object keys sorted alphabetically.
428 ** Prog mode has some support for multi-mode indentation.
429 This allows better indentation support in modes that support multiple
430 programming languages in the same buffer, like literate programming
431 environments or ANTLR programs with embedded Python code.
433 A major mode can provide indentation context for a sub-mode through
434 the `prog-indentation-context' variable. To support this, modes that
435 provide indentation should use `prog-widen' instead of `widen' and
436 `prog-first-column' instead of a literal zero. See the node
437 "Mode-Specific Indent" in the ELisp manual for more details.
439 ** Prettify Symbols mode
442 *** Prettify Symbols mode supports custom composition predicates. By
443 overriding the default `prettify-symbols-compose-predicate', modes can
444 specify in which contexts a symbol may be displayed as some Unicode
445 character. `prettify-symbols-default-compose-p' is the default which
446 is suitable for most programming languages such as C or Lisp (but not
450 *** Symbols can be unprettified while point is inside them.
451 New variable `prettify-symbols-unprettify-at-point' configures this.
453 ** Enhanced xterm support
456 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
457 This variable tells Emacs which advanced capabilities are available in
458 the xterm terminal emulator used to display Emacs text-mode frames.
459 The default is to check each capability, and use it if available.
460 (This variable was introduced in Emacs 24.1, but was not announced in
464 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
465 in the surrounding GUI (using the OSC-52 escape sequence). This only works
466 if your xterm supports it and enables the `allowWindowOps' options (disabled
467 by default at least in Debian, for security reasons).
469 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
470 escape sequence) if your xterm has the feature enabled but for that you
471 additionally need to add `getSelection' to `xterm-extra-capabilities'.
474 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
477 ** The `save-place' variable is replaced by `save-place-mode'.
482 *** ERC can now hide message types by network or channel.
483 `erc-hide-list' will hide all messages of the specified type, while
484 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
485 specified message types for the respective specified targets.
487 *** New variable `erc-default-port-tls' used to connect to TLS IRC
491 *** Reconnection is now asynchronous.
496 *** `midnight-mode' is now a proper minor mode.
499 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
504 *** New "external" package status.
505 An external package is any installed package that's not built-in and
506 not from `package-user-dir', which usually means it's from an entry in
507 `package-directory-list'. They are treated much like built-in
508 packages, in that they cannot be deleted through the package menu and
509 are not considered for upgrades.
511 The effect is that a user can manually place a specific version of a
512 package inside `package-directory-list' and the package menu will
516 *** If a package is available on multiple archives and one has higher
517 priority (as per `package-archive-priorities') only that one is
518 listed. This can be configured with `package-menu-hide-low-priority'.
521 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
522 This includes the above-mentioned low-priority packages, as well as
523 available packages whose version is lower than the currently installed
524 version (which were previously impossible to display).
525 This allows users to downgrade a package if a lower version is
529 *** When filtering the package menu, keywords starting with "arc:" or
530 "status:" represent package archive or status, respectively, instead
534 *** Most functions which involve downloading information now take an
535 ASYNC argument. If it is non-nil, package.el performs the download(s)
539 *** New variable `package-menu-async' controls whether the
540 package-menu uses asynchronous downloads.
543 *** `package-install-from-buffer' and `package-install-file' work on directories.
544 This follows the same rules as installing from a .tar file, except the
545 -pkg file is optional.
548 *** Packages which are dependencies of other packages cannot be deleted.
549 The FORCE argument to `package-delete' overrides this.
552 *** New custom variable `package-selected-packages' tracks packages
553 which were installed by the user (as opposed to installed as
554 dependencies). This variable can also be manually customized.
557 *** New command `package-install-user-selected-packages' installs all
558 packages from `package-selected-packages' which are currently missing.
561 *** New command `package-autoremove' removes all packages which were
562 installed strictly as dependencies but are no longer needed.
567 When you invoke `shell' interactively, the *shell* buffer will now
568 display in a new window. However, you can customize this behavior via
569 the `display-buffer-alist' variable. For example, to get
570 the old behavior -- *shell* buffer displays in current window -- use
571 (add-to-list 'display-buffer-alist
572 '("^\\*shell\\*$" . (display-buffer-same-window))).
576 *** The `:protection' slot option is not obeyed any more.
578 *** The `newname' argument to constructors is optional&deprecated.
579 If you need your objects to be named, do it by inheriting from `eieio-named'.
581 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
583 *** The <class> variables are declared obsolete.
585 *** The <initarg> variables are declared obsolete.
587 *** defgeneric and defmethod are declared obsolete.
588 Use the equivalent facilities from cl-generic.el instead.
590 *** `constructor' is now an obsolete alias for `make-instance'.
591 --- `pcase' accepts a new UPattern `eieio'.
596 *** New command `ido-bury-buffer-at-head' bound to C-S-b
597 Bury the buffer at the head of `ido-matches', analogous to how C-k
598 kills the buffer at head.
601 *** A prefix argument to `ido-restrict-to-matches' will reverse its
602 meaning, and the list is restricted to those elements that do not
603 match the current input.
608 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
609 The new commands `next-line-or-history-element' and
610 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
611 minibuffer, allow by-line movement through minibuffer history,
612 similarly to an ordinary buffer. Only when point moves over
613 the bottom/top of the minibuffer it goes to the next/previous history
614 element. `M-p' and `M-n' still move directly to previous/next history
617 ** Search and Replace
620 *** New user option `search-default-regexp-mode'
621 specifies the default mode for I-search.
624 *** `isearch' and `query-replace' can now perform character folding in matches.
625 Isearch does that by default, while `query-replace' will do that if
626 the new variable `replace-character-fold' is customized to a non-nil
627 value. This is analogous to case folding, but instead of disregarding
628 case variants, it disregards wider classes of distinctions between
629 similar characters. (Case folding is a special case of character
630 folding.) This means many characters in the search string will match
631 entire groups of characters instead of just themselves.
633 For instance, the " will match all variants of double quotes (like “
634 and ”), and the letter a will match all of its accented cousins, even
635 those composed of multiple characters, as well as many other symbols
639 *** New function `character-fold-to-regexp' can be used
640 by searching commands to produce a regexp matching anything that
641 character-folds into STRING.
644 *** The new M-s M-w key binding uses eww to search the web for the
645 text in the region. The search engine to use for this is specified by
646 the customizable variable `eww-search-prefix'.
649 *** Query-replace history is enhanced.
650 When query-replace reads the FROM string from the minibuffer, typing
651 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
652 and TO are the original text and its replacement, and SEP is an arrow
653 string defined by the new variable `query-replace-from-to-separator'.
654 To select a prior replacement, type `M-p' until the desired
655 replacement appears in the minibuffer, and then exit the minibuffer by
660 *** If `quick-calc' is called with a prefix argument, insert the
661 result of the calculation into the current buffer.
664 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
665 this you can tell Edebug not to stop at the start of the first
666 instrumented function.
671 *** New minor mode `global-eldoc-mode'
672 It is turned on by default, and affects `*scratch*' and other buffers
673 whose major mode supports Emacs Lisp.
676 *** `eldoc-documentation-function' now defaults to `ignore'
679 *** `describe-char-eldoc' displays information about character at point,
680 and can be used as a default value of `eldoc-documentation-function'. It is
681 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
682 ] [, ] [, etc.) while using mono-spaced font.
687 *** HTML can now be rendered using variable-width fonts.
690 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
691 whether to use variable-pitch fonts or not. The user can also
692 customize the `shr-use-fonts' variable.
695 *** A new command `C' (`eww-toggle-colors') can be used to toggle
696 whether to use the HTML-specified colors or not. The user can also
697 customize the `shr-use-colors' variable.
700 *** A new command `R' (`eww-readable') will try do identify the main
701 textual parts of a web page and display only that, leaving menus and
702 the like off the page.
705 *** You can now use several eww buffers in parallel by renaming eww
706 buffers you want to keep separate.
709 *** Partial state of the eww buffers (the URIs and the titles of the
710 pages visited) is now preserved in the desktop file.
713 *** `eww-after-render-hook' is now called after eww has rendered
714 the data in the buffer.
717 *** The `eww-reload' command now takes a prefix to not reload via
718 the net, but just use the local copy of the HTML.
721 *** The DOM shr and eww uses has been changed to the general Emacs
722 xml.el/libxml2 DOM, and a new package dom.el has been added to
723 interact with this DOM. See the Emacs Lisp manual for interface
727 *** `mailcap-mime-data' is now consulted when displaying PDF files.
730 *** The new `S' command will list all eww buffers, and allow managing
734 *** https pages with valid certificates have headers marked in green, while
735 invalid certificates are marked in red.
740 *** text/html messages that contain inline image parts will be
741 transformed into multipart/related messages before sending.
744 ** In Show Paren Mode, a parenthesis can be highlighted when point
745 stands inside it, and certain parens can be highlighted when point is
746 at BOL or EOL, or in whitespace there. To enable these, customize,
747 respectively, `show-paren-when-point-inside-paren' or
748 `show-paren-when-point-in-periphery'.
753 *** Strings after `:documentation' are highlighted as docstrings.
754 This enhances Lisp mode fontification to handle documentation of the
755 form `(:documentation "the doc string")' used in Common Lisp code for
756 CLOS class and slot documentation.
761 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
764 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
765 *** `string-rectangle' provides on-the-fly preview of the result.
768 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
769 These should be used in preference to `font-lock-fontify-buffer' when
773 ** Macro `minibuffer-with-setup-hook' can optionally append a function
774 to `minibuffer-setup-hook'.
776 If the first argument of the macro is of the form `(:append FUN)',
777 then FUN will be appended to `minibuffer-setup-hook', instead of
782 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
785 *** `pcase' accepts the new UPattern `cl-struct'.
787 ** Calendar and diary
790 *** The default `diary-file' is now located in .emacs.d.
793 *** New commands to insert diary entries with Chinese dates:
794 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
795 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
798 *** The calendar can now list and mark diary entries with Chinese dates.
799 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
802 *** The option `calendar-mode-line-format' can now be nil,
803 which means to do nothing special with the mode line in calendars.
806 *** New option `calendar-weekend-days'.
807 The option customizes which day headers receive the
808 `calendar-weekend-header' face.
811 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
814 *** Many items obsolete since at least version 23.1 have been removed.
815 The majority were function/variable/face aliases, too numerous to list here.
818 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
819 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
821 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
823 **** Macro `calendar-for-loop'.
825 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
827 **** The nil and list forms of `diary-display-function'.
830 ** New ERT function `ert-summarize-tests-batch-and-exit'.
831 If the output of ERT tests in batch mode execution can be saved to a
832 log file, then it can be passed as an argument to the above function
833 to produce a neat summary.
836 ** New js.el option `js-indent-first-init'.
837 It was renamed from `js-indent-first-initialiser', to avoid issues
838 with American vs British spelling.
843 ** Info mode now displays symbol names in fixed-pitch font.
844 If you want to get the old behavior back, customize the `Info-quoted'
845 face to use the same definitions as the default face.
848 *** `Info-fontify-maximum-menu-size' can be t for no limit.
851 *** `info-display-manual' can now be given a prefix argument which (any
852 non-nil value) directs the command to limit the completion
853 alternatives to currently visited manuals.
856 ** ntlm.el has support for NTLM2.
861 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
862 to delete or undelete multiple messages.
865 *** Rmail can now render HTML mail messages if your Emacs was built with
866 libxml2 or if you have the Lynx browser installed. By default, Rmail
867 will display the HTML version of a mail message that has both HTML and
868 plain text parts, if display of HTML email is possible; customize the
869 `rmail-mime-prefer-html' option to `nil' if you don't want that.
872 *** In the commands that make summaries by subject, recipients, or senders,
873 you can no longer use commas to separate regular expressions.
876 ** SES now supports local printer functions; see `ses-define-local-printer'.
880 *** In sh-mode you can now use `sh-shell' as a file-local variable to
881 specify the type of shell in use (bash, csh, etc).
884 *** New value `always' for `sh-indent-after-continuation'.
885 This provides old-style ("dumb") indentation of continued lines.
886 See the doc string of `sh-indent-after-continuation' for details.
890 *** Fatal TLS errors are now silent by default.
893 *** If Emacs isn't built with TLS support, an external TLS-capable
894 program is used instead. This program used to be run in --insecure
895 mode by default, but has now changed to be secure instead, and will
896 fail if you try to connect to non-verifiable hosts. This is
897 controlled by the `tls-program' variable.
902 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
903 When `url-handler-mode' is enabled, file operations for these
904 protocols as well as for "telnet" and "ftp" are passed to Tramp.
907 *** The URL package allows customizing the `url-user-agent' string.
908 The new `url-user-agent' variable can be customized to be a string or
912 *** The new interface variable `url-request-noninteractive' can be used
913 to specify that we're running in a noninteractive context, and that
914 we should not be queried about things like TLS certificate validity.
917 *** If URL is used with a https connection, the first callback argument
918 plist will contain a :peer element that has the output of
919 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
924 *** New connection method "afp", which allows you to access Mac OS X
925 volumes via the Apple Filing Protocol.
928 *** New connection method "nc", which allows you to access dumb
932 *** Method-specific parameters can be overwritten now with variable
933 `tramp-connection-properties'.
936 *** Handler for `file-notify-valid-p' for remote machines that support
937 filesystem notifications.
942 *** New user variable `sql-default-directory' enables remote
943 connections using Tramp.
946 *** New command `sql-send-line-and-next'.
947 This command, bound to `C-c C-n' by default, sends the current line to
948 the SQL process and advances to the next line, skipping whitespace and
952 *** Added support for Vertica SQL.
954 ** VC and related modes
957 *** Basic push support, via `vc-push', bound to `C-x v P'.
958 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
959 (undocumented) command vc-hg-push now behaves slightly differently.
962 *** The new command vc-region-history shows the log+diff of the active region.
965 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
966 This command is useful when you perform version control commands
967 outside Emacs (e.g., from the shell prompt), or if you switch the VC
968 back-end for the buffer's file, or remove it from version control.
971 *** New option `vc-annotate-background-mode' controls whether
972 the color range from `vc-annotate-color-map' is applied to the
973 background or to the foreground.
976 *** `compare-windows' now compares text with the most recently selected window
977 instead of the next window. If you want the previous behavior of
978 comparing with the next window, customize the new option
979 `compare-windows-get-window-function' to the value
980 `compare-windows-get-next-window'.
983 *** Two new faces `compare-windows-removed' and `compare-windows-added'
984 replace the face `compare-windows', which is now an obsolete alias for
985 `compare-windows-added'.
988 *** `log-edit-insert-changelog' converts "(tiny change)" to
989 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
993 ** VHDL mode now supports VHDL'08.
998 *** Decimal display mode uses "," groups, so it's more
999 fitting for use in money calculations
1002 *** Factorial works with non-integer inputs.
1007 *** Hide-IfDef mode now support full C/C++ expressions in macros,
1008 macro argument expansion, interactive macro evaluation and automatic
1009 scanning of #define'd symbols.
1012 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
1013 result of evaluating a macro.
1016 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
1017 all defined symbols in `hide-ifdef-env'.
1020 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
1021 file name patterns. Defaults to files whose extension is one of `.h',
1022 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
1025 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
1026 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
1027 (This could happen when an idempotent header file is visited again,
1028 when its guard symbol is already defined.) Defaults to `t'.
1031 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
1032 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
1033 looking for macro definitions. By default, no symbols are ignored.
1038 *** New custom variable `tex-print-file-extension' to help users who
1039 use PDF instead of DVI.
1042 *** TeX mode now supports Prettify Symbols mode. When enabling
1043 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
1044 many other math macros are displayed using unicode characters.
1047 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
1048 By default, 32 consecutive spaces or four consecutive TABs are
1049 considered to be too deep, but the new variable
1050 `whitespace-big-indent-regexp' can be customized to change that.
1053 ** New options in `tildify-mode'.
1054 New options `tildify-space-string', `tildify-pattern', and
1055 `tildify-foreach-region-function' variables make
1056 `tildify-string-alist', `tildify-pattern-alist', and
1057 `tildify-ignored-environments-alist' variables (as well as a few
1058 helper functions) obsolete.
1061 ** New package Xref replaces Etags's front-end and UI
1063 The new package Xref provides a generic framework and new commands to
1064 find and move to definitions of functions, macros, data structures
1065 etc., as well as go back to the location where you were before moving
1066 to a definition. It supersedes and obsoletes many Etags commands,
1067 while still using the etags.el code that reads the TAGS tables as one
1070 The command `xref-find-definitions' replaces `find-tag' and provides
1071 an interface to pick one definition among several.
1072 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
1073 `pop-tag-mark', but has a keybinding (`M-,') different from the one
1074 `pop-tag-mark' used.
1076 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
1077 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1078 `xref-find-apropos' replaces `find-tag-regexp'.
1080 As a result of this, the following commands are now obsolete:
1081 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1084 `tags-loop-continue' is not obsolete because it's still useful in
1085 `tags-search' and `tags-query-replace', for which there are no direct
1089 *** Variants of `tags-search' and `tags-query-replace' in Dired were also
1090 replaced by xref-style commands, see the "Dired" section below.
1095 `find-tag-marker-ring-length' is now an obsolete alias for
1096 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1097 alias for a private variable. `xref-push-marker-stack' and
1098 `xref-pop-marker-stack' should be used instead to manipulate the stack
1099 of searches for definitions.
1102 *** `xref-find-definitions' and `describe-function' now display
1103 information about mode local overrides (defined by cedet/mode-local.el
1104 `define-overloadable-function' `define-mode-local-overrides').
1106 The framework's Lisp API is still experimental and can change in major,
1107 backward-incompatible ways.
1110 ** New package Project
1112 The new package Project provides generic infrastructure for dealing
1113 with projects. The main commands included in it are
1114 `project-find-file' and `project-find-regexp'.
1116 The Lisp API of this package is still experimental.
1119 EUDC's LDAP backend has been improved.
1122 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1125 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1126 subprocess instead of on the command line.
1129 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1130 need to configure this manually anymore.
1133 *** The LDAP configuration section of EUDC's manual has been
1136 There have also been customization changes.
1139 *** New custom variable `eudc-server-hotlist' to allow specifying
1140 multiple EUDC servers in init file.
1143 *** Custom variable `eudc-inline-query-format' defaults to completing
1144 on email and firstname instead of surname.
1147 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1148 to avoid interfering with the kill ring.
1151 *** Custom variable `eudc-inline-expansion-format' defaults to
1152 "Firstname Surname <mail-address>".
1155 *** Custom variable `eudc-options-file' defaults to
1156 "~/.emacs.d/eudc-options".
1159 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1160 allow overriding the regular expression that recognizes the ldapsearch
1161 command line's password prompt.
1164 EUDC's BBDB backend now supports BBDB 3.
1167 EUDC's PH backend (eudcb-ph.el) is obsolete.
1172 *** The new built-in command `clear' can scroll window contents out of sight.
1173 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1176 *** New buffer syntax '#<buffer-name>', which is equivalent to
1177 '#<buffer buffer-name>'. This shorthand makes interacting with
1178 buffers from eshell more convenient. Custom variable
1179 `eshell-buffer-shorthand', which has been broken for a while, has been
1183 *** By default, eshell "visual" program buffers (created by
1184 `eshell-visual-commands' and similar custom vars) are no longer killed
1185 when their processes die. This fixes issues with short-lived commands
1186 and makes visual programs more useful in general. For example, if
1187 "git log" is a visual command, it will always show the visual command
1188 buffer, even if the "git log" process dies. For the old behavior,
1189 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1194 *** Support for the Google Chrome web browser.
1197 *** Support for the Conkeror web browser.
1200 *** Support for several ancient browsers is now officially obsolete.
1203 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1204 be added to the archive.
1207 ** Autorevert: dired buffers are also auto-reverted via file
1208 notifications, if Emacs is compiled with file notification support.
1210 ** File Notifications
1213 *** The kqueue library is integrated for *BSD and Mac OS X machines.
1216 *** The new event `stopped' signals, that a file notification watch is
1217 not active any longer.
1220 *** The new function `file-notify-valid-p' checks, whether a file
1221 notification descriptor still corresponds to an activate watch.
1226 *** The command `dired-do-compress' bound to `Z' now can compress
1227 directories and decompress zip files.
1230 *** New command `dired-do-compress-to' bound to `c' can be used to
1231 compress many marked files into a single named archive. The
1232 compression command is determined from the new
1233 `dired-compress-files-alist' variable.
1236 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1237 viewing HTML files and the like.
1239 *** New user interface for the `A' and `Q' commands.
1240 These keys, now bound to `dired-do-find-regexp' and
1241 `dired-do-find-regexp-and-replace', work similarly to `xref-find-apropos'
1242 and `xref-query-replace-in-results': they present the matches
1243 in the `*xref*' buffer and let you move through the matches. No need
1244 to use `tags-loop-continue' to resume the search or replace loop. The
1245 previous commands, `dired-do-search' and
1246 `dired-do-query-replace-regexp', are still available, but not bound to
1247 keys; rebind `A' and `Q' to invoke them if you want the old behavior
1248 back. We intend to obsolete the old commands in a future release.
1250 ** Tabulated List Mode
1253 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1254 call `tabulated-list-init-header', in which case it will have no
1258 *** `tabulated-list-print' takes a second optional argument, update,
1259 which specifies an alternative printing method which is faster when
1260 few or no entries have changed.
1262 ** Obsolete packages
1268 *** landmark.el (moved to elpa.gnu.org)
1271 * New Modes and Packages in Emacs 25.1
1274 ** pinentry.el allows GnuPG passphrase to be prompted through the
1275 minibuffer instead of a graphical dialog, depending on whether the gpg
1276 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1277 is set). This feature requires newer versions of GnuPG (2.1.5 or
1278 later) and Pinentry (0.9.5 or later).
1281 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1282 The main entry points are `cl-defgeneric' and `cl-defmethod'. See the
1283 node "Generic Functions" in the Emacs Lisp manual for more details.
1286 ** scss-mode (a minor variant of css-mode)
1289 ** let-alist is a new macro (and a package) that allows one to easily
1290 let-bind the values stored in an alist.
1293 ** `tildify-mode' allows automatic insertion of hard spaces as one
1294 types the text. Breaking line after a single-character words is
1295 forbidden by Czech and Polish typography (and may be discouraged in
1296 other languages), so `auto-tildify-mode' makes it easier to create
1297 a typographically-correct documents.
1300 ** The `seq' library adds sequence manipulation functions and macros
1301 that complement basic functions provided by subr.el. All functions
1302 are prefixed with `seq-' and work on lists, strings and vectors.
1303 `pcase' accepts a new Upattern `seq'.
1306 ** The `map' library provides map-manipulation functions that work on
1307 alists, hash-table and arrays. All functions are prefixed with
1308 `map-'. `pcase' accepts a new UPattern `map'.
1311 ** The `thunk' library provides functions and macros to control the
1312 evaluation of forms.
1315 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1316 support for JSX, an XML-like syntax extension to ECMAScript.
1319 * Incompatible Lisp Changes in Emacs 25.1
1322 ** `setq' and `setf' must now be called with an even number of
1323 arguments. The earlier behavior of silently supplying a nil to the
1324 last variable when there was an odd number of arguments has been
1328 ** `syntax-begin-function' is declared obsolete.
1329 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1330 slot in font-lock-defaults.
1333 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1334 called during startup. Users who call this function in their init
1335 file and still expect it to be run after startup should set
1336 `package-enable-at-startup' to t after the call to
1337 `package-initialize'.
1340 ** `:global' minor mode use `setq-default' rather than `setq'.
1341 This means that you can't use `make-local-variable' and expect them to
1342 "magically" become buffer-local.
1345 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1346 The `track-mouse' form no longer refrains from changing the shape of
1347 the mouse pointer for the entire time the body of that form is
1348 executed. Lisp programs that use `track-mouse' for dragging across
1349 large portions of the Emacs display, and want to avoid changes in the
1350 pointer shape during dragging, should bind the variable `track-mouse'
1351 to the special value `dragging' in the body of the form.
1354 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1355 has any effect. (This change was made in Emacs 24.4 but was not
1356 advertised at the time.)
1359 ** `indirect-function' does not signal `void-function' any more.
1360 This is mostly a bug-fix, since this change was missed back in 24.4 when
1361 symbol-function was changed not to signal `void-function' any more.
1364 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1367 ** Comint, term, and compile do not set the EMACS env var any more.
1368 Use the INSIDE_EMACS environment variable instead.
1371 ** `save-excursion' does not save&restore the mark any more.
1372 Use `save-mark-and-excursion' if you want the old behavior.
1375 ** `read-buffer' and `read-buffer-function' can now be called with a 4th
1376 argument (`predicate').
1379 ** `completion-table-dynamic' by default stays in the minibuffer.
1380 The minibuffer will be the current buffer when the function is called.
1381 If you want the old behavior of calling the function in the buffer
1382 from which the minibuffer was entered, use the new argument
1383 `switch-buffer' to `completion-table-dynamic'.
1386 ** window-configurations no longer record the buffers' marks.
1389 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1390 active region handling.
1393 ** deactivate-mark is now buffer-local.
1396 ** `cl-the' now asserts that its argument is of the given type.
1399 ** `process-running-child-p' may now return a numeric process
1400 group ID instead of `t'.
1403 ** Mouse click events on mode line or header line no longer include
1404 any reference to a buffer position. The 6th member of the mouse
1405 position list returned for such events is now nil.
1408 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1409 These slots used to hold key-shortcut data, but have been obsolete since
1413 ** Emacs no longer downcases the first letter of a system diagnostic
1414 when signaling a file error. For example, it now reports "Permission
1415 denied" instead of "permission denied". The old behavior was problematic
1416 in languages like German where downcasing rules depend on grammar.
1419 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1420 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1421 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1422 and apostrophe `like this'. The default value nil acts like ‘curve’
1423 if curved single quotes are displayable, and like ‘grave’ otherwise.
1424 The new variable affects display of diagnostics and help, but not of info.
1427 ** substitute-command-keys now replaces quotes.
1428 That is, it converts documentation strings’ quoting style as per the
1429 value of ‘text-quoting-style’. Doc strings in source code can use
1430 either curved single quotes or grave accents and apostrophes. As
1431 before, characters preceded by \= are output as-is.
1434 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1435 They use the new ‘format-message’ function instead of plain ‘format’,
1436 so that they now follow user preference as per ‘text-quoting-style’
1437 when processing curved single quotes, grave accents, and apostrophes
1438 in their format argument.
1441 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1442 now match multibyte characters using Unicode character properties.
1443 If you want the old behavior where they matched any character with
1444 word syntax, use `\sw' instead.
1447 ** The character classes [:graph:] and [:print:] in regular expressions
1448 no longer match every multibyte character. Instead, Emacs now
1449 consults the Unicode character properties to determine which
1450 characters are graphic or printable. In particular, surrogates and
1451 unassigned codepoints are now rejected. If you want the old behavior,
1452 use [:multibyte:] instead.
1455 ** The `diff' command uses the unified format now. To restore the old
1456 behavior, set `diff-switches' to `-c'.
1459 ** `grep-template' and `grep-find-template' values don't include the
1460 --color argument anymore. It's added at the <C> place holder position
1461 dynamically. Any third-party code that changes these templates should
1462 be updated accordingly.
1465 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1466 The new behavior is compatible with Common Lisp and with XEmacs.
1467 This change does not affect Lisp code intended to be portable to
1468 Emacs 24.2 and earlier, which did not support unary ‘/’.
1471 ** The `default-directory' value doesn't have to end slash. To make
1472 that happen, `unhandled-file-name-directory' now defaults to calling
1473 `file-name-as-directory'.
1476 * Lisp Changes in Emacs 25.1
1480 *** New UPatterns `quote', `app'.
1482 *** New UPatterns can be defined with `pcase-defmacro'.
1484 *** New vector QPattern.
1487 ** syntax-propertize is now automatically called on-demand during forward
1488 parsing functions like `forward-sexp'.
1491 ** New hooks `prefix-command-echo-keystrokes-functions' and
1492 `prefix-command-preserve-state-hook' allow the definition of prefix
1493 commands other than the predefined `C-u'.
1496 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1497 These allow conversion between buffer positions and the corresponding
1498 file byte offsets, given the file's encoding.
1501 ** The default value of `load-read-function' is now `read'.
1502 Previously, the default value of `nil' implied using `read'.
1505 ** New hook `pre-redisplay-functions'.
1506 It is a bit easier to use than `pre-redisplay-function'.
1509 ** The second arg of `looking-back' should always be provided explicitly.
1510 Previously, it was an optional argument, now it's mandatory.
1513 ** Text properties `intangible', `point-entered', and `point-left' are obsolete.
1514 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1515 implemented by the new `cursor-intangible-mode' and
1516 `cursor-sensor-mode' minor modes.
1519 ** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
1520 Use the new minor modes `cursor-intangible-mode' and
1521 `cursor-sensor-mode' instead.
1524 ** New process type `pipe', which can be used in combination with the
1525 `:stderr' keyword of make-process to handle standard error output
1529 ** New function `make-process' provides an alternative interface to
1530 `start-process'. It allows programs to set process parameters such as
1531 process filter, sentinel, etc., through keyword arguments (similar to
1532 `make-network-process').
1535 ** A new function `directory-files-recursively' returns all matching
1536 files (recursively) under a directory.
1539 ** New variable `inhibit-message', when bound to non-nil, inhibits
1540 `message' and related functions from displaying messages in the echo
1541 area. The output is still logged to the *Messages* buffer.
1544 ** A new text property `inhibit-read-only' can be used in read-only
1545 buffers to allow certain parts of the text to be writable.
1548 ** A new variable `comment-end-can-be-escaped' is useful in languages
1549 such as C and C++ where line comments with escaped newlines are
1550 continued to the next line.
1553 ** New macro `define-advice'.
1556 ** Emacs Lisp now supports generators.
1557 See the "Generators" section of the ELisp manual for the details.
1560 ** New finalizer facility for running code when objects become unreachable.
1561 See the "Finalizer Type" subsection in the ELisp manual for the
1565 ** lexical closures can use (:documentation FORM) to build their docstring.
1566 It should be placed right where the docstring would be, and FORM is then
1567 evaluated (and should return a string) when the closure is built.
1570 ** define-inline provides a new way to define inlinable functions.
1573 ** New function `macroexpand-1' to perform a single step of macro expansion.
1576 ** Some "x-*" functions were obsoleted and/or renamed:
1577 *** x-select-text is renamed gui-select-text.
1578 *** x-selection-value is renamed gui-selection-value.
1579 *** x-get-selection is renamed gui-get-selection.
1580 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1581 *** x-get-selection-value is renamed to gui-get-primary-selection.
1582 *** x-set-selection is renamed to gui-set-selection
1585 ** New function `string-greaterp', which return the opposite result of
1589 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1590 preserve the collation order as defined by the system's locale(1)
1591 environment. For the time being this is implemented for modern POSIX
1592 systems and for MS-Windows, for other systems they fall back to their
1593 counterparts `string-lessp' and `string-equal'.
1596 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1597 If you want the old, locale-independent sorting, customize the new
1598 option `ls-lisp-use-string-collate' to a nil value.
1601 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1602 if set to a non-nil value, causes the above 2 functions to ignore
1603 symbol and punctuation characters when collating strings. This
1604 emulates the behavior of modern Posix platforms when the locale's
1605 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1606 MS-Windows doesn't support UTF-8 as codeset in its locales.
1609 ** New function `alist-get', which is also a valid place (aka lvalue).
1612 ** New function `funcall-interactively', which works like `funcall'
1613 but makes `called-interactively-p' treat the function as (you guessed it)
1614 called interactively.
1617 ** New function `function-put' to use instead of `put' for function properties.
1620 ** The new function `bidi-find-overridden-directionality' allows you to
1621 find characters whose directionality was, perhaps maliciously,
1622 overridden by directional override control characters. Lisp programs
1623 can use this to detect potential phishing of URLs and other links that
1624 exploits bidirectional display reordering.
1627 ** The new function `buffer-substring-with-bidi-context' allows you to
1628 copy a portion of a buffer into a different location while preserving
1629 the visual appearance both of the copied text and the text at
1630 destination, even when the copied text includes mixed bidirectional
1631 text and directional control characters.
1634 ** New properties that can be specified with `declare':
1635 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1636 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1637 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1641 ** New macro `with-file-modes', for evaluating expressions with default file
1642 permissions set to temporary values (e.g., for creating private files).
1645 ** You can access the slots of structures using `cl-struct-slot-value'.
1648 ** Function `sort' can deal with vectors.
1651 ** Function `system-name' now returns an updated value if the current
1652 system's name has changed or if the Emacs process has changed systems,
1653 and to avoid long waits it no longer consults DNS to canonicalize the
1654 name. The variable `system-name' is now obsolete.
1657 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1660 ** If `pwd' is called with a prefix argument, insert the current default
1664 ** New functions return extended information about fonts and faces.
1667 *** The function `font-info' now returns more details about a font.
1668 In particular, it now returns the average width of the font's
1669 characters, which can be used for geometry-related calculations.
1672 *** A new function `default-font-width' returns the average width of a
1673 character in the current buffer's default font. If the default face
1674 is remapped (see `face-remapping-alist'), the value for the remapped
1675 face is returned. This function complements the existing function
1676 `default-font-height'.
1679 *** New functions `window-font-height' and `window-font-width' return
1680 the height and average width of characters in a specified face and
1681 window. If FACE is remapped (see `face-remapping-alist'), the
1682 function returns the information for the remapped face.
1685 *** A new function `window-max-chars-per-line' returns the maximal
1686 number of characters that can be displayed on one line. If a face
1687 and/or window are provided, these values are used for the
1688 calculation. This function is different from `window-body-width' in
1689 that it accounts for (i) continuation glyphs, (ii) the size of the
1690 font, and (iii) the specified window.
1693 ** New utilities in subr-x.el:
1694 *** New macros `if-let' and `when-let' allow defining bindings and to
1695 execute code depending whether all values are true.
1696 *** New macros `thread-first' and `thread-last' allow threading a form
1697 as the first or last argument of subsequent forms.
1700 ** Documentation strings now support quoting with curved single quotes
1701 ‘like-this’ in addition to the old style with grave accent and
1702 apostrophe `like-this'. The new style looks better on today's displays.
1703 In the new Electric Quote mode, you can enter curved single quotes
1704 into documentation by typing ` and '. Outside Electric Quote mode,
1705 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1706 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1707 ‘text-quoting-style’, the user can specify how to display doc string
1711 ** New function ‘format-message’ is like ‘format’ and also converts
1712 curved single quotes, grave accents and apostrophes as per
1713 ‘text-quoting-style’.
1716 ** show-help-function's arg is converted via substitute-command-keys
1717 before being passed to the function. Help strings, help-echo
1718 properties, etc. can therefore contain command key escapes and
1722 ** Time-related changes:
1724 *** Time conversion functions now accept an optional ZONE argument
1725 that specifies the time zone rules for conversion. ZONE is omitted or
1726 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1727 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1728 rule. The affected functions are ‘current-time-string’,
1729 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1730 function ‘encode-time’, which already accepted a simple time zone rule
1731 argument, has been extended to accept all the new forms.
1733 *** Time-related functions now consistently accept numbers
1734 (representing seconds since the epoch) and nil (representing the
1735 current time) as well as the usual list-of-integer representation.
1736 Affected functions include `current-time-string', `current-time-zone',
1737 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1738 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1739 `time-to-days', and `time-to-seconds'.
1741 *** The `encode-time-value' and `with-decoded-time-value' macros have
1744 *** `calendar-next-time-zone-transition', `time-add', and
1745 `time-subtract' no longer return time values in the obsolete and
1746 undocumented integer-pair format. Instead, they return a list of two
1750 ** New function `set-binary-mode' allows switching a standard stream
1751 of the Emacs process to binary I/O mode.
1754 ** The new function `directory-name-p' can be used to check whether a file
1755 name (as returned from, for instance, `file-name-all-completions') is
1756 a directory file name. It returns non-nil if the last character in
1757 the name is a directory separator character (forward slash on GNU and
1758 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1761 ** ASCII approximations to curved quotes are put in standard-display-table
1762 if the terminal cannot display curved quotes.
1765 ** Standard output and error streams now transliterate characters via
1766 standard-display-table, and encode output using locale-coding-system.
1767 To force a specific encoding, bind `coding-system-for-write' to the
1768 coding-system of your choice when invoking functions like `prin1' and
1772 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1775 ** New possible value for `system-type': `nacl'.
1776 This is used by Google's Native Client (NaCl).
1778 ** Miscellaneous name change
1781 For consistency with the usual Emacs spelling, the Lisp variable
1782 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1783 The old name should still work, as an obsolescent alias.
1785 ** Changes in Frame- and Window- Handling
1788 *** Emacs can now draw horizontal scroll bars on some platforms that
1789 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1790 Horizontal scroll bars are turned off by default.
1792 **** New function `horizontal-scroll-bars-available-p' telling whether
1793 horizontal scroll bars are available on the underlying system.
1795 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1796 bars on all existing and future frames.
1798 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1799 scroll bars on the selected frame.
1801 **** New frame parameters `horizontal-scroll-bars' and
1802 `scroll-bar-height' to set horizontal scroll bars and their height
1803 for individual frames and in `default-frame-alist'.
1805 **** New functions `frame-scroll-bar-height' and
1806 `window-scroll-bar-height' return the height of horizontal scroll
1807 bars on a specific frame or window.
1809 **** `set-window-scroll-bars' now accepts five parameters where the last
1810 two specify height and type of the window's horizontal scroll bar.
1812 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
1815 **** New buffer-local variables `horizontal-scroll-bar' and
1816 `scroll-bar-height'.
1819 *** New functions `frame-geometry' and `frame-edges' give access to a
1823 *** New functions `mouse-absolute-pixel-position' and
1824 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1828 *** The function `window-edges' now accepts three additional arguments to
1829 retrieve body, absolute and pixel edges of the window.
1832 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
1833 `window-inside-absolute-pixel-edges' have been renamed to respectively
1834 `window-body-edges', `window-body-pixel-edges' and
1835 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1838 *** New function `window-absolute-pixel-position' to get the screen
1839 coordinates of a visible buffer position.
1842 *** The height of a frame's menu and tool bar are no longer counted in the
1843 frame's text height. This means that the text height stands only for
1844 the height of the frame's root window plus that of the echo area (if
1845 present). This was already the behavior for frames with external tool
1846 and menu bars (like in the Gtk builds) but has now been extended to all
1850 *** Frames now do not necessarily preserve the number of columns or lines
1851 they display when setting default font, menu bar, fringe width, or
1852 scroll bars. In particular, maximized and fullscreen frames are
1853 conceptually never resized if such settings change. For fullheight and
1854 fullwidth frames, the behavior may depend on the toolkit used.
1855 **** New option `frame-inhibit-implied-resize' if non-nil, means that
1856 setting default font, menu bar, fringe width, or scroll bars of a
1857 specific frame does not resize that frame in order to preserve the
1858 number of columns or lines it displays.
1861 *** New function `window-preserve-size' allows you to preserve the size of
1862 a window without "fixing" it. It's supported by `fit-window-to-buffer',
1863 `temp-buffer-resize-mode' and `display-buffer'.
1866 *** New `display-buffer' action function `display-buffer-use-some-frame'.
1867 This displays the buffer in an existing frame other than the current
1868 frame, and allows the caller to specify a frame predicate to exclude
1872 *** New minor mode `window-divider-mode' and options
1873 `window-divider-default-places', `window-divider-default-bottom-width'
1874 and `window-divider-default-right-width'.
1877 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
1878 Those features have been deprecated in Gtk+ for a long time.
1883 *** etags no longer qualifies class members by default.
1885 By default, `etags' will not qualify class members for C-like
1886 object-oriented languages with their class names and namespaces, and
1887 will remove qualifications used explicitly in the code from the tag
1888 names it puts in TAGS files. This is so the etags.el back-end for
1889 `xref-find-definitions' is more accurate and produces less false
1892 Use --class-qualify (-Q) if you want the old default behavior of
1893 qualifying class members in C++, Java, and Objective C. Note that
1894 using -Q might make some class members become "unknown" to `M-.'
1895 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1896 qualified names by hand.
1899 *** New language Ruby
1901 Names of modules, classes, methods, functions, and constants are
1902 tagged. Overloaded operators are also tagged.
1906 Names of packages, functions, and types are tagged.
1909 *** Improved support for Lua
1911 Etags now tags functions even if the "function" keyword follows some
1912 whitespace at line beginning.
1915 * Changes in Emacs 25.1 on Non-Free Operating Systems
1918 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1919 This includes the makefile.w32-in files in various subdirectories, and
1920 the support files. The file nt/configure.bat now just tells the user
1921 to use the procedure described in nt/INSTALL, by running the Posix
1922 `configure' script in the top-level directory.
1925 ** Building Emacs for MS-Windows requires at least Windows XP
1926 or Windows Server 2003. The built binaries still run on all versions
1927 of Windows starting with Windows 9X.
1930 ** Emacs running on MS-Windows now supports the daemon mode.
1933 ** The byte counts in etags-generated TAGS files are now the same on
1934 MS-Windows as they are on other platforms.
1937 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1938 Pass '--without-ns' to configure to create an X11 build, the old default.
1941 ** OS X 10.5 or older is no longer supported.
1944 ** OS X on PowerPC is no longer supported.
1947 ** New variable `ns-use-fullscreen-animation' controls animation for
1948 non-native NS fullscreen. The default is nil. Set to t to enable
1949 animation when entering and leaving fullscreen. For native OSX fullscreen
1953 ** The new function 'w32-application-type' returns the type of an
1954 MS-Windows application given the name of its executable program file.
1956 ** New variable `w32-pipe-buffer-size'.
1957 It can be used to tune the size of the buffer of pipes created for
1958 communicating with subprocesses, when the program run by a subprocess
1959 exhibits unusual buffering behavior. Default is zero, which lets the
1960 OS use its default size.
1963 ----------------------------------------------------------------------
1964 This file is part of GNU Emacs.
1966 GNU Emacs is free software: you can redistribute it and/or modify
1967 it under the terms of the GNU General Public License as published by
1968 the Free Software Foundation, either version 3 of the License, or
1969 (at your option) any later version.
1971 GNU Emacs is distributed in the hope that it will be useful,
1972 but WITHOUT ANY WARRANTY; without even the implied warranty of
1973 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1974 GNU General Public License for more details.
1976 You should have received a copy of the GNU General Public License
1977 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1983 paragraph-separate: "[
\f]*$"