1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2014-2015 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 If possible, use M-x report-emacs-bug.
9 This file is about changes in Emacs version 25.
11 See file HISTORY for a list of GNU Emacs versions and release dates.
12 See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
13 and NEWS.1-17 for changes in older Emacs versions.
15 You can narrow news to a specific version by calling `view-emacs-news'
16 with a prefix argument or by typing C-u C-h C-n.
19 +++ indicates that all necessary documentation updates are complete.
20 (This means all relevant manuals in doc/ AND lisp doc-strings.)
21 --- means no change in the manuals is needed.
22 When you add a new item, use the appropriate mark if you are sure it applies,
23 otherwise leave it unmarked.
26 * Installation Changes in Emacs 25.2
28 ** 'configure' detects the kqueue file notification library on *BSD
29 and Mac OS X machines.
32 * Changes in Specialized Modes and Packages in Emacs 25.2
36 *** The kqueue library is integrated for *BSD and Mac OS X machines.
39 * Installation Changes in Emacs 25.1
42 ** Building Emacs now requires C99 or later.
45 ** Building Emacs now requires GNU make, version 3.81 or later.
48 ** New configure option --with-cairo.
49 This builds Emacs with Cairo drawing. As a side effect, it provides
50 support for built-in printing, when Emacs was built with GTK+.
52 ** New configure option --with-modules.
53 This enables support for loading dynamic modules; see below.
56 ** By default, Emacs no longer works on IRIX. We expect that Emacs
57 users are not affected by this, as SGI stopped supporting IRIX in
58 December 2013. If you are affected, please send a bug report. You
59 should be able to work around the problem either by porting the Emacs
60 undumping code to GCC under IRIX, or by configuring --with-wide-int,
61 or by sticking with Emacs 24.4.
64 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
65 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
66 since Emacs 24.4, and the other variants were undocumented and were
67 obstacles to maintenance and development. GC_MARK_STACK and its
68 related symbols have been removed from the C internals.
71 ** 'configure' now prefers gnustep-config when configuring GNUstep.
72 If gnustep-config is not available, the old heuristics are used.
75 ** 'configure' now prefers inotify to gfile for file notification,
76 unless gfile is explicitly requested via --with-file-notification='gfile'.
79 ** The configure option '--with-pkg-config-prog' has been removed.
80 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
83 ** The configure option '--with-mmdf' has been removed.
84 It was no longer useful, as it relied on libraries that are no longer
85 supported, and its presence led to confusion during configuration.
86 This affects only the 'movemail' utility; Emacs itself can still
87 process MMDF-format files as before.
90 ** The configure option '--enable-silent-rules' is now the default,
91 and silent rules are now quieter. To get the old behavior where
92 'make' chatters a lot, configure with '--disable-silent-rules' or
93 build with 'make V=1'.
96 ** The configure option '--with-gameuser' now allows to specify a
97 group instead of a user if its argument is prefixed by ':' (a colon).
98 This will cause the game score files in ${localstatedir}/games/emacs
99 to be owned by that group, and the helper program for updating them to
100 be installed setgid. The option now defaults to the 'games' group.
103 ** The `grep-changelog' script (and its manual page) are no longer included.
104 It has no particular connection to Emacs and has not changed in years,
105 so if you want to use it, you can always take a copy from an older Emacs.
108 ** Emacs 25 comes with a new set of icons.
109 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
110 The old Emacs logo icons are available as `emacs23.png' in the same location.
113 * Startup Changes in Emacs 25.1
116 ** When Emacs is given a file as a command line argument and
117 `initial-buffer-choice' is non-nil, display both the file and
118 `initial-buffer-choice'. When Emacs is given more than one file and
119 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
120 and *Buffer List*. This makes Emacs convenient to use from the
121 command line when `initial-buffer-choice' is non-nil.
124 ** The value of ‘initial-scratch-message’ is now treated as a doc string
125 and can contain escape sequences for command keys, quotes, and the like.
128 * Changes in Emacs 25.1
130 ** Emacs can now load shared/dynamic libraries (modules).
131 A dynamic Emacs module is a shared library that provides additional
132 functionality for use in Emacs Lisp programs, just like a package
133 written in Emacs Lisp would. The functions `load', `require',
134 `load-file', etc. were extended to load such modules, as they do with
135 Emacs Lisp packages. The new variable `module-file-suffix' holds the
136 system-dependent value of the file-name extension (`.so' on Posix
137 hosts) of the module files.
139 A module should export a C-callable function named
140 `emacs_module_init', which Emacs will call as part of the call to
141 `load' or `require' which loads the module. It should also export a
142 symbol named `plugin_is_GPL_compatible' to indicate that its code is
143 released under the GPL or compatible license; Emacs will refuse to
144 load modules that don't export such a symbol.
146 If a module needs to call Emacs functions, it should do so through the
147 API defined and documented in the header file `emacs-module.h'. Note
148 that any module that provides Lisp-callable functions will have to use
149 Emacs functions such as `fset' and `funcall', in order to register its
150 functions with the Emacs Lisp interpreter.
152 Modules can create `user-ptr' Lisp objects that embed pointers to C
153 struct's defined by the module. This is useful for keeping around
154 complex data structures created by a module, to be passed back to the
155 module's functions. User-ptr objects can also have associated
156 "finalizers" -- functions to be run when the object is GC'ed; this is
157 useful for freeing any resources allocated for the underlying data
158 structure, such as memory, open file descriptors, etc. A new
159 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
162 Loadable modules in Emacs are an experimental feature, and subject to
163 change in future releases. For that reason, their support is disabled
164 by default, and must be enabled by using the `--with-modules' option
168 ** Any file of the form .dir-locals*.el is now considered a dir-local
169 file, and multiple such files can be used in the same directory. See
170 the variable `dir-locals-file' for more information.
173 ** Network security (TLS/SSL certificate validity and the like) is
174 added via the new Network Security Manager (NSM) and controlled via
175 the `network-security-level' variable.
178 ** International domain names (IDNA) are now encoded via the new
179 puny.el library, so that one can visit web sites like
180 "http://méxico.icom.museum".
182 ** If Emacs isn't built with TLS support, an external TLS-capable
183 program is used instead. This program used to be run in --insecure
184 mode by default, but has now changed to be secure instead, and will
185 fail if you try to connect to non-verifiable hosts. This is
186 controlled by the `tls-program' variable.
189 ** C-h l now also lists the commands that were run.
191 ** The new M-s M-w key binding uses eww to search the web for the
194 ** M-x suggests shorthands and ignores obsolete commands for completion.
195 ** x-select-enable-clipboard is renamed select-enable-clipboard.
196 x-select-enable-primary and 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 ** New input method: `tamil-dvorak'.
237 * Editing Changes in Emacs 25.1
240 ** M-x suggests shorthands and ignores obsolete commands for completion.
245 *** Successive single-char deletions are collapsed in the undo-log just like
246 successive char insertions. Which commands invoke this behavior is
247 controlled by the new `undo-auto-amalgamate' function. See the node
248 "Undo" in the ELisp manual for more details.
251 *** The heuristic used to insert `undo-boundary' after each command
252 has changed, so that if a command causes changes in more than just the
253 current buffer, Emacs now calls `undo-boundary' in every buffer
254 affected by the command.
257 ** New command `comment-line' bound to `C-x C-;'.
259 ** New and improved facilities for inserting Unicode characters
262 *** Unicode names entered via C-x 8 RET now use substring completion by default.
265 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
266 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
269 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
270 as you type. See also the new variable ‘text-quoting-style’.
273 ** New minor mode global-eldoc-mode is enabled by default.
276 ** Emacs now supports "bracketed paste mode" when running on a terminal
277 that supports it. This facility allows Emacs to understand pasted
278 chunks of text as strings to be inserted, instead of interpreting each
279 character in the pasted text as actual user input. This results in a
280 paste experience similar to that under a window system, and significant
281 performance improvements when pasting large amounts of text.
284 ** Emacs now supports the latest version of the UBA.
285 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
286 was updated to support all the latest additions and changes introduced
287 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
288 This includes full support for directional isolates and the
289 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
293 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
296 ** New buffer-local `electric-pair-local-mode'.
299 ** New variable `fast-but-imprecise-scrolling' inhibits
300 fontification during full screen scrolling operations, giving less
301 hesitant operation during auto-repeat of C-v, M-v at the cost of
302 possible inaccuracies in the end position.
305 ** New documentation command `describe-symbol'.
306 Works for functions, variables, faces, etc. It is bound to `C-h o' by
310 ** New function `custom-prompt-customize-unsaved-options' checks for
311 unsaved customizations and prompts user to customize (if found). It
312 is intended for adding to 'kill-emacs-query-functions'.
315 * Changes in Specialized Modes and Packages in Emacs 25.1
320 *** New command `checkdoc-package-keywords' checks if the
321 current package keywords are recognized. Set the new option
322 `checkdoc-package-keywords-flag' to non-nil to make
323 `checkdoc-current-buffer' call this function automatically.
326 *** New function `checkdoc-file' checks for style errors.
327 It's meant for use together with `compile':
328 emacs -batch --eval "(checkdoc-file \"subr.el\")"
331 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
332 It raises an error if a bookmark of that name already exists,
333 unlike `bookmark-set' which silently updates an existing bookmark.
338 *** `imap-ssl-program' has been removed, and imap.el uses the internal
339 GnuTLS encryption functions if possible.
344 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
345 the ordering of object keys by default.
348 *** New commands `json-pretty-print-ordered' and
349 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
350 object keys sorted alphabetically.
353 ** Prog mode has some support for multi-mode indentation.
354 This allows better indentation support in modes that support multiple
355 programming languages in the same buffer, like literate programming
356 environments or ANTLR programs with embedded Python code.
358 A major mode can provide indentation context for a sub-mode through
359 the `prog-indentation-context' variable. To support this, modes that
360 provide indentation should use `prog-widen' instead of `widen' and
361 `prog-first-column' instead of a literal zero. See the node
362 "Mode-Specific Indent" in the ELisp manual for more details.
364 ** Prettify Symbols mode
367 *** Prettify Symbols mode supports custom composition predicates. By
368 overriding the default `prettify-symbols-compose-predicate', modes can
369 specify in which contexts a symbol may be displayed as some Unicode
370 character. `prettify-symbols-default-compose-p' is the default which
371 is suitable for most programming languages such as C or Lisp (but not
375 *** Symbols can be unprettified while point is inside them.
376 New variable `prettify-symbols-unprettify-at-point' configures this.
378 ** Enhanced xterm support
381 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
382 This variable tells Emacs which advanced capabilities are available in
383 the xterm terminal emulator used to display Emacs text-mode frames.
384 The default is to check each capability, and use it if available.
385 (This variable was introduced in Emacs 24.1, but was not announced in
389 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
390 in the surrounding GUI (using the OSC-52 escape sequence). This only works
391 if your xterm supports it and enables the `allowWindowOps' options (disabled
392 by default at least in Debian, for security reasons).
394 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
395 escape sequence) if your xterm has the feature enabled but for that you
396 additionally need to add `getSelection' to `xterm-extra-capabilities'.
399 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
402 ** The `save-place' variable is replaced by `save-place-mode'.
407 *** ERC can now hide message types by network or channel.
408 `erc-hide-list' will hide all messages of the specified type, while
409 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
410 specified message types for the respective specified targets.
412 *** New variable `erc-default-port-tls' used to connect to TLS IRC
418 *** `midnight-mode' is now a proper minor mode.
421 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
426 *** New "external" package status.
427 An external package is any installed package that's not built-in and
428 not from `package-user-dir', which usually means it's from an entry in
429 `package-directory-list'. They are treated much like built-in
430 packages, in that they cannot be deleted through the package menu and
431 are not considered for upgrades.
433 The effect is that a user can manually place a specific version of a
434 package inside `package-directory-list' and the package menu will
438 *** If a package is available on multiple archives and one has higher
439 priority (as per `package-archive-priorities') only that one is
440 listed. This can be configured with `package-menu-hide-low-priority'.
443 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
444 This includes the above-mentioned low-priority packages, as well as
445 available packages whose version is lower than the currently installed
446 version (which were previously impossible to display).
447 This allows users to downgrade a package if a lower version is
451 *** When filtering the package menu, keywords starting with "arc:" or
452 "status:" represent package archive or status, respectively, instead
456 *** Most functions which involve downloading information now take an
457 ASYNC argument. If it is non-nil, package.el performs the download(s)
461 *** New variable `package-menu-async' controls whether the
462 package-menu uses asynchronous downloads.
465 *** `package-install-from-buffer' and `package-install-file' work on directories.
466 This follows the same rules as installing from a .tar file, except the
467 -pkg file is optional.
470 *** Packages which are dependencies of other packages cannot be deleted.
471 The FORCE argument to `package-delete' overrides this.
474 *** New custom variable `package-selected-packages' tracks packages
475 which were installed by the user (as opposed to installed as
476 dependencies). This variable can also be manually customized.
479 *** New command `package-install-user-selected-packages' installs all
480 packages from `package-selected-packages' which are currently missing.
483 *** New command `package-autoremove' removes all packages which were
484 installed strictly as dependencies but are no longer needed.
489 When you invoke `shell' interactively, the *shell* buffer will now
490 display in a new window. However, you can customize this behavior via
491 the `display-buffer-alist' variable. For example, to get
492 the old behavior -- *shell* buffer displays in current window -- use
493 (add-to-list 'display-buffer-alist
494 '("^\\*shell\\*$" . (display-buffer-same-window))).
498 *** The `:protection' slot option is not obeyed any more.
500 *** The `newname' argument to constructors is optional&deprecated.
501 If you need your objects to be named, do it by inheriting from `eieio-named'.
503 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
505 *** The <class> variables are declared obsolete.
507 *** The <initarg> variables are declared obsolete.
508 *** defgeneric and defmethod are declared obsolete.
510 *** `constructor' is now an obsolete alias for `make-instance'.
515 *** New command `ido-bury-buffer-at-head' bound to C-S-b
516 Bury the buffer at the head of `ido-matches', analogous to how C-k
517 kills the buffer at head.
520 *** A prefix argument to `ido-restrict-to-matches' will reverse its
521 meaning, and the list is restricted to those elements that do not
522 match the current input.
527 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
528 The new commands `next-line-or-history-element' and
529 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
530 minibuffer, allow by-line movement through minibuffer history,
531 similarly to an ordinary buffer. Only when point moves over
532 the bottom/top of the minibuffer it goes to the next/previous history
533 element. `M-p' and `M-n' still move directly to previous/next history
536 ** Search and Replace
539 *** New user option `search-default-regexp-mode'
540 specifies the default mode for I-search.
543 *** `isearch' and `query-replace' can now perform character folding in matches.
544 Isearch does that by default, while `query-replace' will do that if
545 the new variable `replace-character-fold' is customized to a non-nil
546 value. This is analogous to case folding, but instead of disregarding
547 case variants, it disregards wider classes of distinctions between
548 similar characters. (Case folding is a special case of character
549 folding.) This means many characters in the search string will match
550 entire groups of characters instead of just themselves.
552 For instance, the " will match all variants of double quotes (like “
553 and ”), and the letter a will match all of its accented cousins, even
554 those composed of multiple characters, as well as many other symbols
558 *** New function `character-fold-to-regexp' can be used
559 by searching commands to produce a regexp matching anything that
560 character-folds into STRING.
563 *** The new M-s M-w key binding uses eww to search the web for the
564 text in the region. The search engine to use for this is specified by
565 the customizable variable `eww-search-prefix'.
568 *** Query-replace history is enhanced.
569 When query-replace reads the FROM string from the minibuffer, typing
570 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
571 and TO are the original text and its replacement, and SEP is an arrow
572 string defined by the new variable `query-replace-from-to-separator'.
573 To select a prior replacement, type `M-p' until the desired
574 replacement appears in the minibuffer, and then exit the minibuffer by
579 *** If `quick-calc' is called with a prefix argument, insert the
580 result of the calculation into the current buffer.
583 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
584 this you can tell Edebug not to stop at the start of the first
585 instrumented function.
590 *** New minor mode `global-eldoc-mode'
591 It is turned on by default, and affects `*scratch*' and other buffers
592 whose major mode supports Emacs Lisp.
595 *** `eldoc-documentation-function' now defaults to `ignore'
598 *** `describe-char-eldoc' displays information about character at point,
599 and can be used as a default value of `eldoc-documentation-function'. It is
600 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
601 ] [, ] [, etc.) while using mono-spaced font.
606 *** HTML can now be rendered using variable-width fonts.
609 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
610 whether to use variable-pitch fonts or not. The user can also
611 customize the `shr-use-fonts' variable.
614 *** A new command `C' (`eww-toggle-colors') can be used to toggle
615 whether to use the HTML-specified colors or not. The user can also
616 customize the `shr-use-colors' variable.
619 *** A new command `R' (`eww-readable') will try do identify the main
620 textual parts of a web page and display only that, leaving menus and
621 the like off the page.
624 *** You can now use several eww buffers in parallel by renaming eww
625 buffers you want to keep separate.
628 *** Partial state of the eww buffers (the URIs and the titles of the
629 pages visited) is now preserved in the desktop file.
632 *** `eww-after-render-hook' is now called after eww has rendered
633 the data in the buffer.
636 *** The `eww-reload' command now takes a prefix to not reload via
637 the net, but just use the local copy of the HTML.
640 *** The DOM shr and eww uses has been changed to the general Emacs
641 xml.el/libxml2 DOM, and a new package dom.el has been added to
642 interact with this DOM. See the Emacs Lisp manual for interface
646 *** `mailcap-mime-data' is now consulted when displaying PDF files.
649 *** The new `S' command will list all eww buffers, and allow managing
653 *** https pages with valid certificates have headers marked in green, while
654 invalid certificates are marked in red.
659 *** text/html messages that contain inline image parts will be
660 transformed into multipart/related messages before sending.
663 ** In Show Paren Mode, a parenthesis can be highlighted when point
664 stands inside it, and certain parens can be highlighted when point is
665 at BOL or EOL, or in whitespace there. To enable these, customize,
666 respectively, `show-paren-when-point-inside-paren' or
667 `show-paren-when-point-in-periphery'.
670 *** Strings after `:documentation' are highlighted as docstrings.
675 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
678 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
679 *** `string-rectangle' provides on-the-fly preview of the result.
682 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
683 These should be used in preference to `font-lock-fontify-buffer' when
687 ** Macro `minibuffer-with-setup-hook' can optionally append a function
688 to `minibuffer-setup-hook'.
690 If the first argument of the macro is of the form `(:append FUN)',
691 then FUN will be appended to `minibuffer-setup-hook', instead of
696 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
698 ** Calendar and diary
701 *** The default `diary-file' is now located in .emacs.d.
704 *** New commands to insert diary entries with Chinese dates:
705 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
706 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
709 *** The calendar can now list and mark diary entries with Chinese dates.
710 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
713 *** The option `calendar-mode-line-format' can now be nil,
714 which means to do nothing special with the mode line in calendars.
717 *** New option `calendar-weekend-days'.
718 The option customizes which day headers receive the
719 `calendar-weekend-header' face.
722 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
725 *** Many items obsolete since at least version 23.1 have been removed.
726 The majority were function/variable/face aliases, too numerous to list here.
729 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
730 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
732 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
734 **** Macro `calendar-for-loop'.
736 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
738 **** The nil and list forms of `diary-display-function'.
741 ** New ERT function `ert-summarize-tests-batch-and-exit'.
742 If the output of ERT tests in batch mode execution can be saved to a
743 log file, then it can be passed as an argument to the above function
744 to produce a neat summary.
746 ** New js.el option `js-indent-first-init'.
751 ** Info mode now displays symbol names in fixed-pitch font.
752 If you want to get the old behavior back, customize the `Info-quoted'
753 face to use the same definitions as the default face.
756 *** `Info-fontify-maximum-menu-size' can be t for no limit.
759 *** `info-display-manual' can now be given a prefix argument which (any
760 non-nil value) directs the command to limit the completion
761 alternatives to currently visited manuals.
764 ** ntlm.el has support for NTLM2.
769 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
770 to delete or undelete multiple messages.
773 *** Rmail can now render HTML mail messages if your Emacs was built with
774 libxml2 or if you have the Lynx browser installed. By default, Rmail
775 will display the HTML version of a mail message that has both HTML and
776 plain text parts, if display of HTML email is possible; customize the
777 `rmail-mime-prefer-html' option to `nil' if you don't want that.
780 *** In the commands that make summaries by subject, recipients, or senders,
781 you can no longer use commas to separate regular expressions.
784 ** SES now supports local printer functions; see `ses-define-local-printer'.
788 *** In sh-mode you can now use `sh-shell' as a file-local variable to
789 specify the type of shell in use (bash, csh, etc).
792 *** New value `always' for `sh-indent-after-continuation'.
793 This provides old-style ("dumb") indentation of continued lines.
794 See the doc string of `sh-indent-after-continuation' for details.
798 *** Fatal TLS errors are now silent by default.
803 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
804 When `url-handler-mode' is enabled, file operations for these
805 protocols as well as for "telnet" and "ftp" are passed to Tramp.
808 *** The URL package allows customizing the `url-user-agent' string.
809 The new `url-user-agent' variable can be customized to be a string or
813 *** The new interface variable `url-request-noninteractive' can be used
814 to specify that we're running in a noninteractive context, and that
815 we should not be queried about things like TLS certificate validity.
818 *** If URL is used with a https connection, the first callback argument
819 plist will contain a :peer element that has the output of
820 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
825 *** New connection method "afp", which allows to access Mac OS X
826 volumes via the Apple Filing Protocol.
829 *** New connection method "nc", which allows to access dumb busyboxes.
832 *** Method-specific parameters can be overwritten now with variable
833 `tramp-connection-properties'.
836 *** Handler for `file-notify-valid-p' for remote machines that support
837 filesystem notifications.
842 *** New user variable `sql-default-directory' enables remote
843 connections using Tramp.
846 *** New command `sql-send-line-and-next'.
847 This command, bound to `C-c C-n' by default, sends the current line to
848 the SQL process and advances to the next line, skipping whitespace and
852 *** Added support for Vertica SQL.
854 ** VC and related modes
857 *** Basic push support, via `vc-push', bound to `C-x v P'.
858 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
859 (undocumented) command vc-hg-push now behaves slightly differently.
862 *** The new command vc-region-history shows the log+diff of the active region.
865 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
866 This command is useful when you perform version control commands
867 outside Emacs (e.g., from the shell prompt), or if you switch the VC
868 back-end for the buffer's file, or remove it from version control.
871 *** New option `vc-annotate-background-mode' controls whether
872 the color range from `vc-annotate-color-map' is applied to the
873 background or to the foreground.
876 *** `compare-windows' now compares text with the most recently selected window
877 instead of the next window. If you want the previous behavior of
878 comparing with the next window, customize the new option
879 `compare-windows-get-window-function' to the value
880 `compare-windows-get-next-window'.
883 *** Two new faces `compare-windows-removed' and `compare-windows-added'
884 replace the face `compare-windows', which is now an obsolete alias for
885 `compare-windows-added'.
888 *** `log-edit-insert-changelog' converts "(tiny change)" to
889 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
893 ** VHDL mode now supports VHDL'08.
898 *** Decimal display mode uses "," groups, so it's more
899 fitting for use in money calculations
902 *** Factorial works with non-integer inputs.
904 ** HideIfDef mode now support full C/C++ expressions, argumented macro
905 expansions, interactive macro evaluation and automatic scanning of
908 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header file
909 name patterns. Default case-insensitive .h, .hh, .hpp, .hxx, and .h++.
910 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
911 reinclusion protected header files from being fully hidden.
912 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
913 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be excluded.
917 *** New custom variable `tex-print-file-extension' to help users who
918 use PDF instead of DVI.
920 *** TeX mode now supports Prettify Symbols mode. When enabling
921 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
922 many other math macros are displayed using unicode characters.
924 ** whitespace-mode: new 'big-indent style highlighting too much indentation.
925 By default, 32 spaces and four TABs are considered to be too much but
926 `whitespace-big-indent-regexp' can be configured to change that.
928 ** tildify: `tildify-space-string', `tildify-pattern', and
929 `tildify-foreach-region-function' variables added making
930 `tildify-string-alist', `tildify-pattern-alist', and
931 `tildify-ignored-environments-alist' variables (as well as a few
932 helper functions) obsolete.
935 The new package provides generic framework and new commands to find
936 and move to definitions, as well as pop back to the original location.
939 `xref-find-definitions' replaces `find-tag' and provides an interface
940 to pick one destination among several. Hence, `tags-loop-continue' is
941 unbound. `xref-pop-marker-stack' replaces `pop-tag-mark', but uses an
942 easier binding, which is now unoccupied (`M-,').
943 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
944 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
945 `xref-find-apropos' replaces `find-tag-regexp'.
948 `find-tag-marker-ring-length' is now an obsolete alias for
949 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
950 alias for a private variable. `xref-push-marker-stack' and
951 `xref-pop-marker-stack' should be used to mutate it instead.
954 *** `xref-find-definitions' and `describe-function' now display
955 information about mode local overrides (defined by cedet/mode-local.el
956 `define-overloadable-function' `define-mode-local-overrides').
959 As a result of the above, these commands are now obsolete:
960 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
961 `tags-apropos' and `tags-loop-continue'.
964 EUDC's LDAP backend has been improved.
966 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
968 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
969 subprocess instead of on the command line.
971 *** EUDC handles LDAP wildcards automatically so the user shouldn't
972 need to configure this manually anymore.
974 *** The LDAP configuration section of EUDC's manual has been
977 There have also been customization changes.
979 *** New custom variable `eudc-server-hotlist' to allow specifying
980 multiple EUDC servers in init file.
982 *** Custom variable `eudc-inline-query-format' defaults to completing
983 on email and firstname instead of surname.
985 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
986 to avoid interfering with the kill ring.
988 *** Custom variable `eudc-inline-expansion-format' defaults to
989 "Firstname Surname <mail-address>".
991 *** Custom variable `eudc-options-file' defaults to
992 "~/.emacs.d/eudc-options".
994 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
995 allow overriding the regular expression that recognizes the ldapsearch
996 command line's password prompt.
998 EUDC's BBDB backend now supports BBDB 3.
1000 EUDC's PH backend (eudcb-ph.el) is obsolete.
1005 *** The new built-in command `clear' can scroll window contents out of sight.
1006 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1008 *** New buffer syntax '#<buffer-name>', which is equivalent to
1009 '#<buffer buffer-name>'. This shorthand makes interacting with
1010 buffers from eshell more convenient. Custom variable
1011 `eshell-buffer-shorthand', which has been broken for a while, has been
1014 *** By default, eshell "visual" program buffers (created by
1015 `eshell-visual-commands' and similar custom vars) are no longer killed
1016 when their processes die. This fixes issues with short-lived commands
1017 and makes visual programs more useful in general. For example, if
1018 "git log" is a visual command, it will always show the visual command
1019 buffer, even if the "git log" process dies. For the old behavior,
1020 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1024 *** Support for the Conkeror web browser.
1027 *** Support for several ancient browsers is now officially obsolete.
1030 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1031 be added to the archive.
1034 ** Autorevert: dired buffers are also auto-reverted via file
1035 notifications, if Emacs is compiled with file notification support.
1037 ** File Notifications
1040 *** The new event `stopped' signals, that a file notification watch is
1041 not active any longer.
1044 *** The new function `file-notify-valid-p' checks, whether a file
1045 notification descriptor still corresponds to an activate watch.
1050 *** The command `dired-do-compress' bound to `Z' now can compress
1051 directories and decompress zip files.
1054 *** New command `dired-do-compress-to' bound to `c' can be used to
1055 compress many marked files into a single named archive. The
1056 compression command is determined from the new
1057 `dired-compress-files-alist' variable.
1060 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1061 viewing HTML files and the like.
1063 ** Tabulated List Mode
1066 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1067 call `tabulated-list-init-header', in which case it will have no
1071 *** `tabulated-list-print' takes a second optional argument, update,
1072 which specifies an alternative printing method which is faster when
1073 few or no entries have changed.
1075 ** Obsolete packages
1080 *** landmark.el (moved to elpa.gnu.org)
1083 * New Modes and Packages in Emacs 25.1
1085 ** pinentry.el allows GnuPG passphrase to be prompted through the
1086 minibuffer instead of a graphical dialog, depending on whether the gpg
1087 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1088 is set). This feature requires newer versions of GnuPG (2.1.5 or
1089 later) and Pinentry (0.9.5 or later).
1091 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1093 ** scss-mode (a minor variant of css-mode)
1095 ** let-alist is a new macro (and a package) that allows one to easily
1096 let-bind the values stored in an alist.
1098 ** `tildify-mode' allows to automatically insert hard spaces as one
1099 types the text. Breaking line after a single-character words is
1100 forbidden by Czech and Polish typography (and may be discouraged in
1101 other languages), so `auto-tildify-mode' makes it easier to create
1102 a typographically-correct documents.
1104 ** The `seq' library adds sequence manipulation functions and macros
1105 that complement basic functions provided by subr.el. All functions
1106 are prefixed with `seq-' and work on lists, strings and vectors.
1108 ** The `map' library provides map-manipulation functions that work on
1109 alists, hash-table and arrays. All functions are prefixed with
1112 ** The `thunk' library provides functions and macros to control the
1113 evaluation of forms.
1115 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1116 support for JSX, an XML-like syntax extension to ECMAScript.
1119 * Incompatible Lisp Changes in Emacs 25.1
1122 ** `setq' and `setf' must now be called with an even number of
1123 arguments. The earlier behavior of silently supplying a nil to the
1124 last variable when there was an odd number of arguments has been
1127 ** `syntax-begin-function' is declared obsolete.
1128 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1129 slot in font-lock-defaults.
1132 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1133 called during startup. Users who call this function in their init
1134 file and still expect it to be run after startup should set
1135 `package-enable-at-startup' to t after the call to
1136 `package-initialize'.
1138 ** `:global' minor mode use `setq-default' rather than `setq'.
1139 This means that you can't use `make-local-variable' and expect them to
1140 "magically" become buffer-local.
1142 ** `inhibit-point-motion-hooks' now defaults to t and is obsolete.
1145 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1146 The `track-mouse' form no longer refrains from changing the shape of
1147 the mouse pointer for the entire time the body of that form is
1148 executed. Lisp programs that use `track-mouse' for dragging across
1149 large portions of the Emacs display, and want to avoid changes in the
1150 pointer shape during dragging, should bind the variable `track-mouse'
1151 to the special value `dragging' in the body of the form.
1154 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1155 has any effect. (This change was made in Emacs 24.4 but was not
1156 advertised at the time.)
1158 ** `indirect-function' does not signal `void-function' any more.
1159 This is mostly a bug-fix, since this change was missed back in 24.4 when
1160 symbol-function was changed not to signal `void-function' any more.
1162 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1164 ** Comint, term, and compile do not set the EMACS env var any more.
1165 Use the INSIDE_EMACS environment variable instead.
1167 ** `save-excursion' does not save&restore the mark any more.
1169 ** read-buffer-function can now be called with a 4th argument (`predicate').
1171 ** completion-table-dynamic stays in the minibuffer.
1172 If you want the old behavior of calling the function in the buffer
1173 from which the minibuffer was entered, call it with the new argument
1176 ** window-configurations no longer record the buffers' marks.
1178 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1179 active region handling.
1181 ** deactivate-mark is now buffer-local.
1183 ** `cl-the' now asserts that its argument is of the given type.
1185 ** `process-running-child-p` may now return a numeric process
1186 group ID instead of `t'.
1189 ** Mouse click events on mode line or header line no longer include
1190 any reference to a buffer position. The 6th member of the mouse
1191 position list returned for such events is now nil.
1193 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1194 These slots used to hold key-shortcut data, but have been obsolete since
1197 ** Emacs no longer downcases the first letter of a system diagnostic
1198 when signaling a file error. For example, it now reports "Permission
1199 denied" instead of "permission denied". The old behavior was problematic
1200 in languages like German where downcasing rules depend on grammar.
1203 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1204 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1205 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1206 and apostrophe `like this'. The default value nil acts like ‘curve’
1207 if curved single quotes are displayable, and like ‘grave’ otherwise.
1208 The new variable affects display of diagnostics and help, but not of info.
1211 ** substitute-command-keys now replaces quotes.
1212 That is, it converts documentation strings’ quoting style as per the
1213 value of ‘text-quoting-style’. Doc strings in source code can use
1214 either curved single quotes or grave accents and apostrophes. As
1215 before, characters preceded by \= are output as-is.
1218 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1219 They use the new ‘format-message’ function instead of plain ‘format’,
1220 so that they now follow user preference as per ‘text-quoting-style’
1221 when processing curved single quotes, grave accents, and apostrophes
1222 in their format argument.
1225 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1226 now match multibyte characters using Unicode character properties.
1227 If you want the old behavior where they matched any character with
1228 word syntax, use `\sw' instead.
1231 ** The character classes [:graph:] and [:print:] in regular expressions
1232 no longer match every multibyte character. Instead, Emacs now
1233 consults the Unicode character properties to determine which
1234 characters are graphic or printable. In particular, surrogates and
1235 unassigned codepoints are now rejected. If you want the old behavior,
1236 use [:multibyte:] instead.
1239 ** The `diff' command uses the unified format now. To restore the old
1240 behavior, set `diff-switches' to `-c'.
1242 ** `grep-template' and `grep-find-template' values don't include the
1243 --color argument anymore. It's added at the <C> place holder position
1244 dynamically. Any third-party code that changes these templates should
1245 be updated accordingly.
1248 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1249 The new behavior is compatible with Common Lisp and with XEmacs.
1250 This change does not affect Lisp code intended to be portable to
1251 Emacs 24.2 and earlier, which did not support unary ‘/’.
1254 ** The `default-directory' value doesn't have to end slash. To make
1255 that happen, `unhandled-file-name-directory' now defaults to calling
1256 `file-name-as-directory'.
1259 * Lisp Changes in Emacs 25.1
1262 *** New UPatterns `quote', `app', `cl-struct', `eieio', `seq', and `map'.
1263 *** New UPatterns can be defined with `pcase-defmacro'.
1265 *** New vector QPattern.
1267 ** syntax-propertize is now automatically called on-demand during forward
1268 parsing functions like `forward-sexp'.
1270 ** New hooks prefix-command-echo-keystrokes-functions and
1271 prefix-command-preserve-state-hook, to allow the definition of prefix
1272 commands other than the predefined C-u.
1274 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1276 ** The default value of `load-read-function' is now `read'.
1278 ** New hook `pre-redisplay-functions', a bit easier to use than pre-redisplay-function.
1280 ** The second arg of `looking-back' should always be provided explicitly.
1282 ** Obsolete text properties `intangible', `point-entered', and `point-left'.
1283 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1284 implemented by the new `cursor-intangible-mode' and
1285 `cursor-sensor-mode' minor modes.
1287 ** New process type `pipe', which can be used in combination with the
1288 `:stderr' keyword of make-process to handle standard error output
1291 ** New function `make-process' provides an alternative interface to
1292 `start-process'. It allows programs to set process parameters such as
1293 process filter, sentinel, etc., through keyword arguments (similar to
1294 `make-network-process').
1297 ** A new function `directory-files-recursively' returns all matching
1298 files (recursively) under a directory.
1301 ** New variable `inhibit-message', when bound to non-nil, inhibits
1302 `message' and related functions from displaying messages the Echo
1303 Area. The output is still logged to the *Messages* buffer.
1306 ** A new text property `inhibit-read-only' can be used in read-only
1307 buffers to allow certain parts of the text to be writable.
1310 ** A new variable `comment-end-can-be-escaped' is useful in languages
1311 such as C and C++ where line comments with escaped newlines are
1312 continued to the next line.
1315 ** New macro `define-advice'.
1317 ** `read-buffer' takes a new `predicate' argument.
1319 ** Emacs Lisp now supports generators.
1321 ** New finalizer facility for running code when objects
1324 ** lexical closures can use (:documentation <form>) to build their docstring.
1325 It should be placed right where the docstring would be, and <form> is then
1326 evaluated (and should return a string) when the closure is built.
1328 ** define-inline provides a new way to define inlinable functions.
1330 ** New function `macroexpand-1' to perform a single step of macroexpansion.
1332 ** Some "x-*" were obsoleted:
1333 *** x-select-text is renamed gui-select-text.
1334 *** x-selection-value is renamed gui-selection-value.
1335 *** x-get-selection is renamed gui-get-selection.
1336 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1337 *** x-get-selection-value is renamed to gui-get-primary-selection.
1338 *** x-set-selection is renamed to gui-set-selection
1340 ** New function `string-greaterp', which return the opposite result of
1344 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1345 preserve the collation order as defined by the system's locale(1)
1346 environment. For the time being this is implemented for modern POSIX
1347 systems and for MS-Windows, for other systems they fall back to their
1348 counterparts `string-lessp' and `string-equal'.
1351 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1352 If you want the old, locale-independent sorting, customize the new
1353 option `ls-lisp-use-string-collate' to a nil value.
1356 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1357 if set to a non-nil value, causes the above 2 functions to ignore
1358 symbol and punctuation characters when collating strings. This
1359 emulates the behavior of modern Posix platforms when the locale's
1360 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1361 MS-Windows doesn't support UTF-8 as codeset in its locales.
1363 ** New function `alist-get', which is also a valid place (aka lvalue).
1365 ** New function `funcall-interactively', which works like `funcall'
1366 but makes `called-interactively-p' treat the function as (you guessed it)
1367 called interactively.
1369 ** New function `function-put' to use instead of `put' for function properties.
1372 ** The new function `bidi-find-overridden-directionality' allows to
1373 find characters whose directionality was, perhaps maliciously,
1374 overridden by directional override control characters. Lisp programs
1375 can use this to detect potential phishing of URLs and other links that
1376 exploits bidirectional display reordering.
1379 ** The new function `buffer-substring-with-bidi-context' allows to
1380 copy a portion of a buffer into a different location while preserving
1381 the visual appearance both of the copied text and the text at
1382 destination, even when the copied text includes mixed bidirectional
1383 text and directional control characters.
1386 ** New properties that can be specified with `declare':
1387 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1388 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1389 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1393 ** New macro `with-file-modes', for evaluating expressions with default file
1394 permissions set to temporary values (e.g., for creating private files).
1396 ** You can access the slots of structures using `cl-struct-slot-value'.
1398 ** Function `sort' can deal with vectors.
1400 ** Function `system-name' now returns an updated value if the current
1401 system's name has changed or if the Emacs process has changed systems,
1402 and to avoid long waits it no longer consults DNS to canonicalize the
1403 name. The variable `system-name' is now obsolete.
1406 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1408 ** If `pwd' is called with a prefix argument, insert the current default
1412 ** New functions return extended information about fonts and faces.
1415 *** The function `font-info' now returns more details about a font.
1416 In particular, it now returns the average width of the font's
1417 characters, which can be used for geometry-related calculations.
1420 *** A new function `default-font-width' returns the average width of a
1421 character in the current buffer's default font. If the default face
1422 is remapped (see `face-remapping-alist'), the value for the remapped
1423 face is returned. This function complements the existing function
1424 `default-font-height'.
1427 *** New functions `window-font-height' and `window-font-width' return
1428 the height and average width of characters in a specified face and
1429 window. If FACE is remapped (see `face-remapping-alist'), the
1430 function returns the information for the remapped face.
1433 *** A new function `window-max-chars-per-line' returns the maximal
1434 number of characters that can be displayed on one line. If a face
1435 and/or window are provided, these values are used for the
1436 calculation. This function is different from `window-body-width' in
1437 that it accounts for (i) continuation glyphs, (ii) the size of the
1438 font, and (iii) the specified window.
1441 ** New utilities in subr-x.el:
1442 *** New macros `if-let' and `when-let' allow defining bindings and to
1443 execute code depending whether all values are true.
1444 *** New macros `thread-first' and `thread-last' allow threading a form
1445 as the first or last argument of subsequent forms.
1448 ** Documentation strings now support quoting with curved single quotes
1449 ‘like-this’ in addition to the old style with grave accent and
1450 apostrophe `like-this'. The new style looks better on today's displays.
1451 In the new Electric Quote mode, you can enter curved single quotes
1452 into documentation by typing ` and '. Outside Electric Quote mode,
1453 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1454 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1455 ‘text-quoting-style’, the user can specify how to display doc string
1459 ** New function ‘format-message’ is like ‘format’ and also converts
1460 curved single quotes, grave accents and apostrophes as per
1461 ‘text-quoting-style’.
1464 ** show-help-function's arg is converted via substitute-command-keys
1465 before being passed to the function. Help strings, help-echo
1466 properties, etc. can therefore contain command key escapes and
1470 ** Time-related changes:
1472 *** Time conversion functions now accept an optional ZONE argument
1473 that specifies the time zone rules for conversion. ZONE is omitted or
1474 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1475 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1476 rule. The affected functions are ‘current-time-string’,
1477 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1478 function ‘encode-time’, which already accepted a simple time zone rule
1479 argument, has been extended to accept all the new forms.
1481 *** Time-related functions now consistently accept numbers
1482 (representing seconds since the epoch) and nil (representing the
1483 current time) as well as the usual list-of-integer representation.
1484 Affected functions include `current-time-string', `current-time-zone',
1485 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1486 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1487 `time-to-days', and `time-to-seconds'.
1489 *** The `encode-time-value' and `with-decoded-time-value' macros have
1492 *** `calendar-next-time-zone-transition', `time-add', and
1493 `time-subtract' no longer return time values in the obsolete and
1494 undocumented integer-pair format. Instead, they return a list of two
1498 ** New function `set-binary-mode' allows to switch a standard stream
1499 of the Emacs process to binary I/O mode.
1502 ** The new function `directory-name-p' can be used to check whether a file
1503 name (as returned from, for instance, `file-name-all-completions') is
1504 a directory file name. It returns non-nil if the last character in
1505 the name is a directory separator character (forward slash on GNU and
1506 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1508 ** ASCII approximations to curved quotes are put in standard-display-table
1509 if the terminal cannot display curved quotes.
1511 ** Standard output and error streams now transliterate characters via
1512 standard-display-table, and encode output using locale-coding-system.
1515 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1518 ** New possible value for `system-type': `nacl'.
1519 This is used by Google's Native Client (NaCl).
1521 ** Miscellaneous name change
1523 For consistency with the usual Emacs spelling, the Lisp variable
1524 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1525 The old name should still work, as an obsolescent alias.
1528 * Changes in Frames and Windows Code in Emacs 25.1
1531 ** Emacs can now draw horizontal scroll bars on some platforms that
1532 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1533 Horizontal scroll bars are turned off by default.
1534 *** New function `horizontal-scroll-bars-available-p' telling whether
1535 horizontal scroll bars are available on the underlying system.
1536 *** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1537 bars on all existing and future frames.
1538 *** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1539 scroll bars on the selected frame.
1540 *** New frame parameters `horizontal-scroll-bars' and
1541 `scroll-bar-height' to set horizontal scroll bars and their height
1542 for individual frames and in `default-frame-alist'.
1543 *** New functions `frame-scroll-bar-height' and
1544 `window-scroll-bar-height' return the height of horizontal scroll
1545 bars on a specific frame or window.
1546 *** `set-window-scroll-bars' now accepts five parameters where the last
1547 two specify height and type of the window's horizontal scroll bar.
1548 *** `window-scroll-bars' now returns type and sizes of horizontal scroll
1550 *** New buffer-local variables `horizontal-scroll-bar' and
1551 `scroll-bar-height'.
1554 ** New functions `frame-geometry' and `frame-edges' give access to a
1558 ** New functions `mouse-absolute-pixel-position' and
1559 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1563 ** The function `window-edges' now accepts three additional arguments to
1564 retrieve body, absolute and pixel edges of the window.
1567 ** The functions `window-inside-edges', `window-inside-pixel-edges' and
1568 `window-inside-absolute-pixel-edges' have been renamed to respectively
1569 `window-body-edges', `window-body-pixel-edges' and
1570 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1573 ** New function `window-absolute-pixel-position' to get the screen
1574 coordinates of a visible buffer position.
1577 ** The height of a frame's menu and tool bar are no longer counted in the
1578 frame's text height. This means that the text height stands only for
1579 the height of the frame's root window plus that of the echo area (if
1580 present). This was already the behavior for frames with external tool
1581 and menu bars (like in the Gtk builds) but has now been extended to all
1585 ** Frames now do not necessarily preserve the number of columns or lines
1586 they display when setting default font, menu bar, fringe width, or
1587 scroll bars. In particular, maximized and fullscreen frames are
1588 conceptually never resized if such settings change. For fullheight and
1589 fullwidth frames, the behavior may depend on the toolkit used.
1590 *** New option `frame-inhibit-implied-resize' if non-nil, means that
1591 setting default font, menu bar, fringe width, or scroll bars of a
1592 specific frame does not resize that frame in order to preserve the
1593 number of columns or lines it displays.
1596 ** New function `window-preserve-size' allows to preserve the size of
1597 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1598 `temp-buffer-resize-mode' and `display-buffer'.
1601 ** New `display-buffer' action function `display-buffer-use-some-frame'.
1602 This displays the buffer in an existing frame other than the current
1603 frame, and allows the caller to specify a frame predicate to exclude
1607 ** New minor mode `window-divider-mode' and options
1608 `window-divider-default-places', `window-divider-default-bottom-width'
1609 and `window-divider-default-right-width'.
1611 ** Tearoff menus and detachable toolbars for Gtk+ has been removed.
1612 Those features have been deprecated in Gtk+ for a long time.
1616 *** etags no longer qualifies class members by default.
1618 By default, `etags' will not qualify class members for C-like
1619 object-oriented languages with their class names and namespaces, and
1620 will remove qualifications used explicitly in the code from the tag
1621 names it puts in TAGS files. This is so the etags.el back-end for
1622 `xref-find-definitions' is more accurate and produces less false
1625 Use --class-qualify (-Q) if you want the old default behavior of
1626 qualifying class members in C++, Java, and Objective C. Note that
1627 using -Q might make some class members become "unknown" to `M-.'
1628 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1629 qualified names by hand.
1631 *** New language Ruby
1633 Names of modules, classes, methods, and functions are tagged.
1634 Overloaded operators are also tagged.
1636 *** Improved support for Lua
1638 Etags now tags functions even if the "function" keyword follows some
1639 whitespace at line beginning.
1642 * Changes in Emacs 25.1 on Non-Free Operating Systems
1645 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1646 This includes the makefile.w32-in files in various subdirectories, and
1647 the support files. The file nt/configure.bat now just tells the user
1648 to use the procedure described in nt/INSTALL, by running the Posix
1649 `configure' script in the top-level directory.
1652 ** Building Emacs for MS-Windows requires at least Windows XP
1653 or Windows Server 2003. The built binaries still run on all versions
1654 of Windows starting with Windows 9X.
1657 ** Emacs running on MS-Windows now supports the daemon mode.
1659 ** The byte counts in etags-generated TAGS files are now the same on
1660 MS-Windows as they are on other platforms.
1663 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1664 Pass '--without-ns' to configure to create an X11 build, the old default.
1666 ** OS X 10.5 or older is no longer supported.
1668 ** OS X on PowerPC is no longer supported.
1671 ** New variable `ns-use-fullscreen-animation' controls animation for
1672 non-native NS fullscreen. The default is nil. Set to t to enable
1673 animation when entering and leaving fullscreen. For native OSX fullscreen
1677 ** The new function 'w32-application-type' returns the type of an
1678 MS-Windows application given the name of its executable program file.
1681 ----------------------------------------------------------------------
1682 This file is part of GNU Emacs.
1684 GNU Emacs is free software: you can redistribute it and/or modify
1685 it under the terms of the GNU General Public License as published by
1686 the Free Software Foundation, either version 3 of the License, or
1687 (at your option) any later version.
1689 GNU Emacs is distributed in the hope that it will be useful,
1690 but WITHOUT ANY WARRANTY; without even the implied warranty of
1691 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1692 GNU General Public License for more details.
1694 You should have received a copy of the GNU General Public License
1695 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1701 paragraph-separate: "[
\f]*$"