1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2014-2016 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 If possible, use M-x report-emacs-bug.
9 This file is about changes in Emacs version 25.
11 See file HISTORY for a list of GNU Emacs versions and release dates.
12 See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
13 and NEWS.1-17 for changes in older Emacs versions.
15 You can narrow news to a specific version by calling `view-emacs-news'
16 with a prefix argument or by typing C-u C-h C-n.
19 +++ indicates that all necessary documentation updates are complete.
20 (This means all relevant manuals in doc/ AND lisp doc-strings.)
21 --- means no change in the manuals is needed.
22 When you add a new item, use the appropriate mark if you are sure it applies,
23 otherwise leave it unmarked.
26 * Installation Changes in Emacs 25.1
29 ** Building Emacs now requires C99 or later.
32 ** Building Emacs now requires GNU make, version 3.81 or later.
35 ** New configure option --with-cairo.
36 This builds Emacs with Cairo drawing. As a side effect, it provides
37 support for built-in printing, when Emacs was built with GTK+.
39 ** New configure option --with-modules.
40 This enables support for loading dynamic modules; see below.
43 ** By default, Emacs no longer works on IRIX. We expect that Emacs
44 users are not affected by this, as SGI stopped supporting IRIX in
45 December 2013. If you are affected, please send a bug report. You
46 should be able to work around the problem either by porting the Emacs
47 undumping code to GCC under IRIX, or by configuring --with-wide-int,
48 or by sticking with Emacs 24.4.
51 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
52 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
53 since Emacs 24.4, and the other variants were undocumented and were
54 obstacles to maintenance and development. GC_MARK_STACK and its
55 related symbols have been removed from the C internals.
58 ** 'configure' now prefers gnustep-config when configuring GNUstep.
59 If gnustep-config is not available, the old heuristics are used.
62 ** 'configure' now prefers inotify to gfile for file notification,
63 unless gfile is explicitly requested via --with-file-notification='gfile'.
66 ** The configure option '--with-pkg-config-prog' has been removed.
67 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
70 ** The configure option '--with-mmdf' has been removed.
71 It was no longer useful, as it relied on libraries that are no longer
72 supported, and its presence led to confusion during configuration.
73 This affects only the 'movemail' utility; Emacs itself can still
74 process MMDF-format files as before.
77 ** The configure option '--enable-silent-rules' is now the default,
78 and silent rules are now quieter. To get the old behavior where
79 'make' chatters a lot, configure with '--disable-silent-rules' or
80 build with 'make V=1'.
83 ** The configure option '--with-gameuser' now allows to specify a
84 group instead of a user if its argument is prefixed by ':' (a colon).
85 This will cause the game score files in ${localstatedir}/games/emacs
86 to be owned by that group, and the helper program for updating them to
87 be installed setgid. The option now defaults to the 'games' group.
90 ** The `grep-changelog' script (and its manual page) are no longer included.
91 It has no particular connection to Emacs and has not changed in years,
92 so if you want to use it, you can always take a copy from an older Emacs.
95 ** Emacs 25 comes with a new set of icons.
96 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
97 The old Emacs logo icons are available as `emacs23.png' in the same location.
100 * Startup Changes in Emacs 25.1
103 ** When Emacs is given a file as a command line argument and
104 `initial-buffer-choice' is non-nil, display both the file and
105 `initial-buffer-choice'. When Emacs is given more than one file and
106 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
107 and *Buffer List*. This makes Emacs convenient to use from the
108 command line when `initial-buffer-choice' is non-nil.
111 ** The value of ‘initial-scratch-message’ is now treated as a doc string
112 and can contain escape sequences for command keys, quotes, and the like.
115 * Changes in Emacs 25.1
117 ** Emacs can now load shared/dynamic libraries (modules).
118 A dynamic Emacs module is a shared library that provides additional
119 functionality for use in Emacs Lisp programs, just like a package
120 written in Emacs Lisp would. The functions `load', `require',
121 `load-file', etc. were extended to load such modules, as they do with
122 Emacs Lisp packages. The new variable `module-file-suffix' holds the
123 system-dependent value of the file-name extension (`.so' on Posix
124 hosts) of the module files.
126 A module should export a C-callable function named
127 `emacs_module_init', which Emacs will call as part of the call to
128 `load' or `require' which loads the module. It should also export a
129 symbol named `plugin_is_GPL_compatible' to indicate that its code is
130 released under the GPL or compatible license; Emacs will refuse to
131 load modules that don't export such a symbol.
133 If a module needs to call Emacs functions, it should do so through the
134 API defined and documented in the header file `emacs-module.h'. Note
135 that any module that provides Lisp-callable functions will have to use
136 Emacs functions such as `fset' and `funcall', in order to register its
137 functions with the Emacs Lisp interpreter.
139 Modules can create `user-ptr' Lisp objects that embed pointers to C
140 struct's defined by the module. This is useful for keeping around
141 complex data structures created by a module, to be passed back to the
142 module's functions. User-ptr objects can also have associated
143 "finalizers" -- functions to be run when the object is GC'ed; this is
144 useful for freeing any resources allocated for the underlying data
145 structure, such as memory, open file descriptors, etc. A new
146 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
149 Loadable modules in Emacs are an experimental feature, and subject to
150 change in future releases. For that reason, their support is disabled
151 by default, and must be enabled by using the `--with-modules' option
155 ** Any file of the form .dir-locals*.el is now considered a dir-local
156 file, and multiple such files can be used in the same directory. See
157 the variable `dir-locals-file' for more information.
160 ** Network security (TLS/SSL certificate validity and the like) is
161 added via the new Network Security Manager (NSM) and controlled via
162 the `network-security-level' variable.
164 ** If Emacs isn't built with TLS support, an external TLS-capable
165 program is used instead. This program used to be run in --insecure
166 mode by default, but has now changed to be secure instead, and will
167 fail if you try to connect to non-verifiable hosts. This is
168 controlled by the `tls-program' variable.
171 ** C-h l now also lists the commands that were run.
174 ** x-select-enable-clipboard is renamed select-enable-clipboard
175 and x-select-enable-primary is renamed select-enable-primary.
176 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
177 name it), with the proviso that on some systems (e.g. Windows)
178 select-enable-primary is ineffective since the system doesn't
179 have the equivalent of a primary selection.
182 ** New option `switch-to-buffer-in-dedicated-window' allows to customize
183 how `switch-to-buffer' proceeds interactively when the selected window
184 is strongly dedicated to its buffer.
187 ** The option `even-window-heights' has been renamed to
188 `even-window-sizes' and now handles window widths as well.
191 ** terpri gets an optional arg ENSURE to conditionally output a newline.
194 ** `insert-register' now leaves point after the inserted text
195 when called interactively. A prefix argument toggles this behavior.
198 ** The new variable `term-file-aliases' replaces some files from lisp/term.
199 The function `tty-run-terminal-initialization' consults this variable
200 when deciding what terminal-specific initialization code to run.
203 ** New variable `system-configuration-features', listing some of the
204 main features that Emacs was compiled with. This is mainly intended
205 for use in Emacs bug reports.
208 ** A password is now hidden also when typed in batch mode. Another
209 hiding character but the default `.' can be used by let-binding the
210 variable `read-hide-char'.
213 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
216 * Editing Changes in Emacs 25.1
219 ** M-x suggests shorthands and ignores obsolete commands for completion.
224 *** Successive single-char deletions are collapsed in the undo-log just like
225 successive char insertions. Which commands invoke this behavior is
226 controlled by the new `undo-auto-amalgamate' function. See the node
227 "Undo" in the ELisp manual for more details.
230 *** The heuristic used to insert `undo-boundary' after each command
231 has changed, so that if a command causes changes in more than just the
232 current buffer, Emacs now calls `undo-boundary' in every buffer
233 affected by the command.
236 ** New command `comment-line' bound to `C-x C-;'.
238 ** New and improved facilities for inserting Unicode characters
241 *** Unicode names entered via C-x 8 RET now use substring completion by default.
244 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
245 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
248 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
249 as you type. See also the new variable ‘text-quoting-style’.
252 ** New minor mode global-eldoc-mode is enabled by default.
255 ** Emacs now supports "bracketed paste mode" when running on a terminal
256 that supports it. This facility allows Emacs to understand pasted
257 chunks of text as strings to be inserted, instead of interpreting each
258 character in the pasted text as actual user input. This results in a
259 paste experience similar to that under a window system, and significant
260 performance improvements when pasting large amounts of text.
263 ** Emacs now supports the latest version of the UBA.
264 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
265 was updated to support all the latest additions and changes introduced
266 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
267 This includes full support for directional isolates and the
268 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
272 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
275 ** New buffer-local `electric-pair-local-mode'.
278 ** New variable `fast-but-imprecise-scrolling' inhibits
279 fontification during full screen scrolling operations, giving less
280 hesitant operation during auto-repeat of C-v, M-v at the cost of
281 possible inaccuracies in the end position.
284 ** New documentation command `describe-symbol'.
285 Works for functions, variables, faces, etc. It is bound to `C-h o' by
289 ** New function `custom-prompt-customize-unsaved-options' checks for
290 unsaved customizations and prompts user to customize (if found). It
291 is intended for adding to 'kill-emacs-query-functions'.
294 * Changes in Specialized Modes and Packages in Emacs 25.1
299 *** New command `checkdoc-package-keywords' checks if the
300 current package keywords are recognized. Set the new option
301 `checkdoc-package-keywords-flag' to non-nil to make
302 `checkdoc-current-buffer' call this function automatically.
305 *** New function `checkdoc-file' checks for style errors.
306 It's meant for use together with `compile':
307 emacs -batch --eval "(checkdoc-file \"subr.el\")"
310 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
311 It raises an error if a bookmark of that name already exists,
312 unlike `bookmark-set' which silently updates an existing bookmark.
317 *** `imap-ssl-program' has been removed, and imap.el uses the internal
318 GnuTLS encryption functions if possible.
323 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
324 the ordering of object keys by default.
327 *** New commands `json-pretty-print-ordered' and
328 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
329 object keys sorted alphabetically.
332 ** Prog mode has some support for multi-mode indentation.
333 This allows better indentation support in modes that support multiple
334 programming languages in the same buffer, like literate programming
335 environments or ANTLR programs with embedded Python code.
337 A major mode can provide indentation context for a sub-mode through
338 the `prog-indentation-context' variable. To support this, modes that
339 provide indentation should use `prog-widen' instead of `widen' and
340 `prog-first-column' instead of a literal zero. See the node
341 "Mode-Specific Indent" in the ELisp manual for more details.
343 ** Prettify Symbols mode
346 *** Prettify Symbols mode supports custom composition predicates. By
347 overriding the default `prettify-symbols-compose-predicate', modes can
348 specify in which contexts a symbol may be displayed as some Unicode
349 character. `prettify-symbols-default-compose-p' is the default which
350 is suitable for most programming languages such as C or Lisp (but not
354 *** Symbols can be unprettified while point is inside them.
355 New variable `prettify-symbols-unprettify-at-point' configures this.
357 ** Enhanced xterm support
360 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
361 This variable tells Emacs which advanced capabilities are available in
362 the xterm terminal emulator used to display Emacs text-mode frames.
363 The default is to check each capability, and use it if available.
364 (This variable was introduced in Emacs 24.1, but was not announced in
368 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
369 in the surrounding GUI (using the OSC-52 escape sequence). This only works
370 if your xterm supports it and enables the `allowWindowOps' options (disabled
371 by default at least in Debian, for security reasons).
373 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
374 escape sequence) if your xterm has the feature enabled but for that you
375 additionally need to add `getSelection' to `xterm-extra-capabilities'.
378 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
381 ** The `save-place' variable is replaced by `save-place-mode'.
386 *** ERC can now hide message types by network or channel.
387 `erc-hide-list' will hide all messages of the specified type, while
388 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
389 specified message types for the respective specified targets.
394 *** `midnight-mode' is now a proper minor mode.
397 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
402 *** New "external" package status.
403 An external package is any installed package that's not built-in and
404 not from `package-user-dir', which usually means it's from an entry in
405 `package-directory-list'. They are treated much like built-in
406 packages, in that they cannot be deleted through the package menu and
407 are not considered for upgrades.
409 The effect is that a user can manually place a specific version of a
410 package inside `package-directory-list' and the package menu will
414 *** If a package is available on multiple archives and one has higher
415 priority (as per `package-archive-priorities') only that one is
416 listed. This can be configured with `package-menu-hide-low-priority'.
419 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
420 This includes the above-mentioned low-priority packages, as well as
421 available packages whose version is lower than the currently installed
422 version (which were previously impossible to display).
423 This allows users to downgrade a package if a lower version is
427 *** When filtering the package menu, keywords starting with "arc:" or
428 "status:" represent package archive or status, respectively, instead
432 *** Most functions which involve downloading information now take an
433 ASYNC argument. If it is non-nil, package.el performs the download(s)
437 *** New variable `package-menu-async' controls whether the
438 package-menu uses asynchronous downloads.
441 *** `package-install-from-buffer' and `package-install-file' work on directories.
442 This follows the same rules as installing from a .tar file, except the
443 -pkg file is optional.
446 *** Packages which are dependencies of other packages cannot be deleted.
447 The FORCE argument to `package-delete' overrides this.
450 *** New custom variable `package-selected-packages' tracks packages
451 which were installed by the user (as opposed to installed as
452 dependencies). This variable can also be manually customized.
455 *** New command `package-install-user-selected-packages' installs all
456 packages from `package-selected-packages' which are currently missing.
459 *** New command `package-autoremove' removes all packages which were
460 installed strictly as dependencies but are no longer needed.
465 When you invoke `shell' interactively, the *shell* buffer will now
466 display in a new window. However, you can customize this behavior via
467 the `display-buffer-alist' variable. For example, to get
468 the old behavior -- *shell* buffer displays in current window -- use
469 (add-to-list 'display-buffer-alist
470 '("^\\*shell\\*$" . (display-buffer-same-window))).
474 *** The `:protection' slot option is not obeyed any more.
476 *** The `newname' argument to constructors is optional&deprecated.
477 If you need your objects to be named, do it by inheriting from `eieio-named'.
479 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
481 *** The <class> variables are declared obsolete.
483 *** The <initarg> variables are declared obsolete.
484 *** defgeneric and defmethod are declared obsolete.
486 *** `constructor' is now an obsolete alias for `make-instance'.
491 *** New command `ido-bury-buffer-at-head' bound to C-S-b
492 Bury the buffer at the head of `ido-matches', analogous to how C-k
493 kills the buffer at head.
496 *** A prefix argument to `ido-restrict-to-matches' will reverse its
497 meaning, and the list is restricted to those elements that do not
498 match the current input.
503 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
504 The new commands `next-line-or-history-element' and
505 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
506 minibuffer, allow by-line movement through minibuffer history,
507 similarly to an ordinary buffer. Only when point moves over
508 the bottom/top of the minibuffer it goes to the next/previous history
509 element. `M-p' and `M-n' still move directly to previous/next history
512 ** Search and Replace
515 *** New user option `search-default-regexp-mode'
516 specifies the default mode for I-search.
519 *** `isearch' and `query-replace' can now perform character folding in matches.
520 Isearch does that by default, while `query-replace' will do that if
521 the new variable `replace-character-fold' is customized to a non-nil
522 value. This is analogous to case folding, but instead of disregarding
523 case variants, it disregards wider classes of distinctions between
524 similar characters. (Case folding is a special case of character
525 folding.) This means many characters in the search string will match
526 entire groups of characters instead of just themselves.
528 For instance, the " will match all variants of double quotes (like “
529 and ”), and the letter a will match all of its accented cousins, even
530 those composed of multiple characters, as well as many other symbols
534 *** New function `character-fold-to-regexp' can be used
535 by searching commands to produce a regexp matching anything that
536 character-folds into STRING.
539 *** The new M-s M-w key binding uses eww to search the web for the
540 text in the region. The search engine to use for this is specified by
541 the customizable variable `eww-search-prefix'.
544 *** Query-replace history is enhanced.
545 When query-replace reads the FROM string from the minibuffer, typing
546 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
547 and TO are the original text and its replacement, and SEP is an arrow
548 string defined by the new variable `query-replace-from-to-separator'.
549 To select a prior replacement, type `M-p' until the desired
550 replacement appears in the minibuffer, and then exit the minibuffer by
555 *** If `quick-calc' is called with a prefix argument, insert the
556 result of the calculation into the current buffer.
559 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
560 this you can tell Edebug not to stop at the start of the first
561 instrumented function.
566 *** New minor mode `global-eldoc-mode'
567 It is turned on by default, and affects `*scratch*' and other buffers
568 whose major mode supports Emacs Lisp.
571 *** `eldoc-documentation-function' now defaults to `ignore'
574 *** `describe-char-eldoc' displays information about character at point,
575 and can be used as a default value of `eldoc-documentation-function'. It is
576 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
577 ] [, ] [, etc.) while using mono-spaced font.
582 *** HTML can now be rendered using variable-width fonts.
585 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
586 whether to use variable-pitch fonts or not. The user can also
587 customize the `shr-use-fonts' variable.
590 *** A new command `R' (`eww-readable') will try do identify the main
591 textual parts of a web page and display only that, leaving menus and
592 the like off the page.
595 *** You can now use several eww buffers in parallel by renaming eww
596 buffers you want to keep separate.
599 *** Partial state of the eww buffers (the URIs and the titles of the
600 pages visited) is now preserved in the desktop file.
603 *** `eww-after-render-hook' is now called after eww has rendered
604 the data in the buffer.
607 *** The `eww-reload' command now takes a prefix to not reload via
608 the net, but just use the local copy of the HTML.
611 *** The DOM shr and eww uses has been changed to the general Emacs
612 xml.el/libxml2 DOM, and a new package dom.el has been added to
613 interact with this DOM. See the Emacs Lisp manual for interface
617 *** `mailcap-mime-data' is now consulted when displaying PDF files.
620 *** The new `S' command will list all eww buffers, and allow managing
624 *** https pages with valid certificates have headers marked in green, while
625 invalid certificates are marked in red.
630 *** text/html messages that contain inline image parts will be
631 transformed into multipart/related messages before sending.
634 ** In Show Paren Mode, a parenthesis can be highlighted when point
635 stands inside it, and certain parens can be highlighted when point is
636 at BOL or EOL, or in whitespace there. To enable these, customize,
637 respectively, `show-paren-when-point-inside-paren' or
638 `show-paren-when-point-in-periphery'.
643 *** Strings after `:documentation' are highlighted as docstrings.
644 This enhances Lisp mode fontification to handle documentation of the
645 form `(:documentation "the doc string")' used in Common Lisp code for
646 CLOS class and slot documentation.
651 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
654 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
655 *** `string-rectangle' provides on-the-fly preview of the result.
658 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
659 These should be used in preference to `font-lock-fontify-buffer' when
663 ** Macro `minibuffer-with-setup-hook' can optionally append a function
664 to `minibuffer-setup-hook'.
666 If the first argument of the macro is of the form `(:append FUN)',
667 then FUN will be appended to `minibuffer-setup-hook', instead of
672 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
674 ** Calendar and diary
677 *** The default `diary-file' is now located in .emacs.d.
680 *** New commands to insert diary entries with Chinese dates:
681 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
682 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
685 *** The calendar can now list and mark diary entries with Chinese dates.
686 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
689 *** The option `calendar-mode-line-format' can now be nil,
690 which means to do nothing special with the mode line in calendars.
693 *** New option `calendar-weekend-days'.
694 The option customizes which day headers receive the
695 `calendar-weekend-header' face.
698 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
701 *** Many items obsolete since at least version 23.1 have been removed.
702 The majority were function/variable/face aliases, too numerous to list here.
705 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
706 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
708 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
710 **** Macro `calendar-for-loop'.
712 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
714 **** The nil and list forms of `diary-display-function'.
717 ** New ERT function `ert-summarize-tests-batch-and-exit'.
718 If the output of ERT tests in batch mode execution can be saved to a
719 log file, then it can be passed as an argument to the above function
720 to produce a neat summary.
722 ** New js.el option `js-indent-first-init'.
727 ** Info mode now displays symbol names in fixed-pitch font.
728 If you want to get the old behavior back, customize the `Info-quoted'
729 face to use the same definitions as the default face.
732 *** `Info-fontify-maximum-menu-size' can be t for no limit.
735 *** `info-display-manual' can now be given a prefix argument which (any
736 non-nil value) directs the command to limit the completion
737 alternatives to currently visited manuals.
740 ** ntlm.el has support for NTLM2.
745 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
746 to delete or undelete multiple messages.
749 *** Rmail can now render HTML mail messages if your Emacs was built with
750 libxml2 or if you have the Lynx browser installed. By default, Rmail
751 will display the HTML version of a mail message that has both HTML and
752 plain text parts, if display of HTML email is possible; customize the
753 `rmail-mime-prefer-html' option to `nil' if you don't want that.
756 *** In the commands that make summaries by subject, recipients, or senders,
757 you can no longer use commas to separate regular expressions.
760 ** SES now supports local printer functions; see `ses-define-local-printer'.
764 *** In sh-mode you can now use `sh-shell' as a file-local variable to
765 specify the type of shell in use (bash, csh, etc).
768 *** New value `always' for `sh-indent-after-continuation'.
769 This provides old-style ("dumb") indentation of continued lines.
770 See the doc string of `sh-indent-after-continuation' for details.
774 *** Fatal TLS errors are now silent by default.
779 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
780 When `url-handler-mode' is enabled, file operations for these
781 protocols as well as for "telnet" and "ftp" are passed to Tramp.
784 *** The URL package allows customizing the `url-user-agent' string.
785 The new `url-user-agent' variable can be customized to be a string or
789 *** The new interface variable `url-request-noninteractive' can be used
790 to specify that we're running in a noninteractive context, and that
791 we should not be queried about things like TLS certificate validity.
794 *** If URL is used with a https connection, the first callback argument
795 plist will contain a :peer element that has the output of
796 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
801 *** New connection method "afp", which allows to access Mac OS X
802 volumes via the Apple Filing Protocol.
805 *** New connection method "nc", which allows to access dumb busyboxes.
808 *** Method-specific parameters can be overwritten now with variable
809 `tramp-connection-properties'.
812 *** Handler for `file-notify-valid-p' for remote machines that support
813 filesystem notifications.
818 *** New user variable `sql-default-directory' enables remote
819 connections using Tramp.
822 *** New command `sql-send-line-and-next'.
823 This command, bound to `C-c C-n' by default, sends the current line to
824 the SQL process and advances to the next line, skipping whitespace and
828 *** Added support for Vertica SQL.
830 ** VC and related modes
833 *** Basic push support, via `vc-push', bound to `C-x v P'.
834 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
835 (undocumented) command vc-hg-push now behaves slightly differently.
838 *** The new command vc-region-history shows the log+diff of the active region.
841 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
842 This command is useful when you perform version control commands
843 outside Emacs (e.g., from the shell prompt), or if you switch the VC
844 back-end for the buffer's file, or remove it from version control.
847 *** New option `vc-annotate-background-mode' controls whether
848 the color range from `vc-annotate-color-map' is applied to the
849 background or to the foreground.
852 *** `compare-windows' now compares text with the most recently selected window
853 instead of the next window. If you want the previous behavior of
854 comparing with the next window, customize the new option
855 `compare-windows-get-window-function' to the value
856 `compare-windows-get-next-window'.
859 *** Two new faces `compare-windows-removed' and `compare-windows-added'
860 replace the face `compare-windows', which is now an obsolete alias for
861 `compare-windows-added'.
864 *** `log-edit-insert-changelog' converts "(tiny change)" to
865 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
869 ** VHDL mode now supports VHDL'08.
874 *** Decimal display mode uses "," groups, so it's more
875 fitting for use in money calculations
878 *** Factorial works with non-integer inputs.
883 *** Hide-IfDef mode now support full C/C++ expressions in macros,
884 macro argument expansion, interactive macro evaluation and automatic
885 scanning of #define'd symbols.
888 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
889 result of evaluating a macro.
892 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
893 all defined symbols in `hide-ifdef-env'.
896 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
897 file name patterns. Defaults to files whose extension is one of `.h',
898 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
901 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
902 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
903 (This could happen when an idempotent header file is visited again,
904 when its guard symbol is already defined.) Defaults to `t'.
907 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
908 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
909 looking for macro definitions. By default, no symbols are ignored.
914 *** New custom variable `tex-print-file-extension' to help users who
915 use PDF instead of DVI.
918 *** TeX mode now supports Prettify Symbols mode. When enabling
919 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
920 many other math macros are displayed using unicode characters.
923 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
924 By default, 32 consecutive spaces or four consecutive TABs are
925 considered to be too deep, but the new variable
926 `whitespace-big-indent-regexp' can be customized to change that.
929 ** New options in `tildify-mode'.
930 New options `tildify-space-string', `tildify-pattern', and
931 `tildify-foreach-region-function' variables make
932 `tildify-string-alist', `tildify-pattern-alist', and
933 `tildify-ignored-environments-alist' variables (as well as a few
934 helper functions) obsolete.
936 ** New package Xref replaces Etags's front-end and UI
938 The new package Xref provides a generic framework and new commands to
939 find and move to definitions of functions, macros, data structures
940 etc., as well as go back to the location where you were before moving
941 to a definition. It supersedes and obsoletes many Etags commands,
942 while still using the etags.el code that reads the TAGS tables as one
945 The command `xref-find-definitions' replaces `find-tag' and provides
946 an interface to pick one definition among several.
947 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
948 `pop-tag-mark', but has a keybinding (`M-,'), unlike `pop-tag-mark'.
950 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
951 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
952 `xref-find-apropos' replaces `find-tag-regexp'.
954 As a result of this, the following commands are now obsolete:
955 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
956 `tags-apropos', and `tags-loop-continue'.
960 `find-tag-marker-ring-length' is now an obsolete alias for
961 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
962 alias for a private variable. `xref-push-marker-stack' and
963 `xref-pop-marker-stack' should be used to mutate it instead.
966 *** `xref-find-definitions' and `describe-function' now display
967 information about mode local overrides (defined by cedet/mode-local.el
968 `define-overloadable-function' `define-mode-local-overrides').
971 EUDC's LDAP backend has been improved.
973 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
975 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
976 subprocess instead of on the command line.
978 *** EUDC handles LDAP wildcards automatically so the user shouldn't
979 need to configure this manually anymore.
981 *** The LDAP configuration section of EUDC's manual has been
984 There have also been customization changes.
986 *** New custom variable `eudc-server-hotlist' to allow specifying
987 multiple EUDC servers in init file.
989 *** Custom variable `eudc-inline-query-format' defaults to completing
990 on email and firstname instead of surname.
992 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
993 to avoid interfering with the kill ring.
995 *** Custom variable `eudc-inline-expansion-format' defaults to
996 "Firstname Surname <mail-address>".
998 *** Custom variable `eudc-options-file' defaults to
999 "~/.emacs.d/eudc-options".
1001 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1002 allow overriding the regular expression that recognizes the ldapsearch
1003 command line's password prompt.
1005 EUDC's BBDB backend now supports BBDB 3.
1007 EUDC's PH backend (eudcb-ph.el) is obsolete.
1012 *** The new built-in command `clear' can scroll window contents out of sight.
1013 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1015 *** New buffer syntax '#<buffer-name>', which is equivalent to
1016 '#<buffer buffer-name>'. This shorthand makes interacting with
1017 buffers from eshell more convenient. Custom variable
1018 `eshell-buffer-shorthand', which has been broken for a while, has been
1021 *** By default, eshell "visual" program buffers (created by
1022 `eshell-visual-commands' and similar custom vars) are no longer killed
1023 when their processes die. This fixes issues with short-lived commands
1024 and makes visual programs more useful in general. For example, if
1025 "git log" is a visual command, it will always show the visual command
1026 buffer, even if the "git log" process dies. For the old behavior,
1027 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1031 *** Support for the Conkeror web browser.
1034 *** Support for several ancient browsers is now officially obsolete.
1037 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1038 be added to the archive.
1041 ** Autorevert: dired buffers are also auto-reverted via file
1042 notifications, if Emacs is compiled with file notification support.
1044 ** File Notifications
1047 *** The new event `stopped' signals, that a file notification watch is
1048 not active any longer.
1051 *** The new function `file-notify-valid-p' checks, whether a file
1052 notification descriptor still corresponds to an activate watch.
1057 *** The command `dired-do-compress' bound to `Z' now can compress
1058 directories and decompress zip files.
1061 *** New command `dired-do-compress-to' bound to `c' can be used to
1062 compress many marked files into a single named archive. The
1063 compression command is determined from the new
1064 `dired-compress-files-alist' variable.
1066 ** Tabulated List Mode
1069 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1070 call `tabulated-list-init-header', in which case it will have no
1074 *** `tabulated-list-print' takes a second optional argument, update,
1075 which specifies an alternative printing method which is faster when
1076 few or no entries have changed.
1078 ** Obsolete packages
1083 *** landmark.el (moved to elpa.gnu.org)
1086 * New Modes and Packages in Emacs 25.1
1088 ** pinentry.el allows GnuPG passphrase to be prompted through the
1089 minibuffer instead of a graphical dialog, depending on whether the gpg
1090 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1091 is set). This feature requires newer versions of GnuPG (2.1.5 or
1092 later) and Pinentry (0.9.5 or later).
1094 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1096 ** scss-mode (a minor variant of css-mode)
1098 ** let-alist is a new macro (and a package) that allows one to easily
1099 let-bind the values stored in an alist.
1101 ** `tildify-mode' allows to automatically insert hard spaces as one
1102 types the text. Breaking line after a single-character words is
1103 forbidden by Czech and Polish typography (and may be discouraged in
1104 other languages), so `auto-tildify-mode' makes it easier to create
1105 a typographically-correct documents.
1107 ** The `seq' library adds sequence manipulation functions and macros
1108 that complement basic functions provided by subr.el. All functions
1109 are prefixed with `seq-' and work on lists, strings and vectors.
1111 ** The `map' library provides map-manipulation functions that work on
1112 alists, hash-table and arrays. All functions are prefixed with
1115 ** The `thunk' library provides functions and macros to control the
1116 evaluation of forms.
1118 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1119 support for JSX, an XML-like syntax extension to ECMAScript.
1122 * Incompatible Lisp Changes in Emacs 25.1
1125 ** `setq' and `setf' must now be called with an even number of
1126 arguments. The earlier behavior of silently supplying a nil to the
1127 last variable when there was an odd number of arguments has been
1130 ** `syntax-begin-function' is declared obsolete.
1131 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1132 slot in font-lock-defaults.
1135 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1136 called during startup. Users who call this function in their init
1137 file and still expect it to be run after startup should set
1138 `package-enable-at-startup' to t after the call to
1139 `package-initialize'.
1141 ** `:global' minor mode use `setq-default' rather than `setq'.
1142 This means that you can't use `make-local-variable' and expect them to
1143 "magically" become buffer-local.
1145 ** `inhibit-point-motion-hooks' now defaults to t and is obsolete.
1148 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1149 The `track-mouse' form no longer refrains from changing the shape of
1150 the mouse pointer for the entire time the body of that form is
1151 executed. Lisp programs that use `track-mouse' for dragging across
1152 large portions of the Emacs display, and want to avoid changes in the
1153 pointer shape during dragging, should bind the variable `track-mouse'
1154 to the special value `dragging' in the body of the form.
1157 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1158 has any effect. (This change was made in Emacs 24.4 but was not
1159 advertised at the time.)
1161 ** `indirect-function' does not signal `void-function' any more.
1162 This is mostly a bug-fix, since this change was missed back in 24.4 when
1163 symbol-function was changed not to signal `void-function' any more.
1165 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1167 ** Comint, term, and compile do not set the EMACS env var any more.
1168 Use the INSIDE_EMACS environment variable instead.
1170 ** `save-excursion' does not save&restore the mark any more.
1172 ** read-buffer-function can now be called with a 4th argument (`predicate').
1174 ** completion-table-dynamic stays in the minibuffer.
1175 If you want the old behavior of calling the function in the buffer
1176 from which the minibuffer was entered, call it with the new argument
1179 ** window-configurations no longer record the buffers' marks.
1181 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1182 active region handling.
1184 ** deactivate-mark is now buffer-local.
1186 ** `cl-the' now asserts that its argument is of the given type.
1188 ** `process-running-child-p` may now return a numeric process
1189 group ID instead of `t'.
1192 ** Mouse click events on mode line or header line no longer include
1193 any reference to a buffer position. The 6th member of the mouse
1194 position list returned for such events is now nil.
1196 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1197 These slots used to hold key-shortcut data, but have been obsolete since
1200 ** Emacs no longer downcases the first letter of a system diagnostic
1201 when signaling a file error. For example, it now reports "Permission
1202 denied" instead of "permission denied". The old behavior was problematic
1203 in languages like German where downcasing rules depend on grammar.
1206 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1207 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1208 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1209 and apostrophe `like this'. The default value nil acts like ‘curve’
1210 if curved single quotes are displayable, and like ‘grave’ otherwise.
1211 The new variable affects display of diagnostics and help, but not of info.
1214 ** substitute-command-keys now replaces quotes.
1215 That is, it converts documentation strings’ quoting style as per the
1216 value of ‘text-quoting-style’. Doc strings in source code can use
1217 either curved single quotes or grave accents and apostrophes. As
1218 before, characters preceded by \= are output as-is.
1221 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1222 They use the new ‘format-message’ function instead of plain ‘format’,
1223 so that they now follow user preference as per ‘text-quoting-style’
1224 when processing curved single quotes, grave accents, and apostrophes
1225 in their format argument.
1228 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1229 now match multibyte characters using Unicode character properties.
1230 If you want the old behavior where they matched any character with
1231 word syntax, use `\sw' instead.
1234 ** The character classes [:graph:] and [:print:] in regular expressions
1235 no longer match every multibyte character. Instead, Emacs now
1236 consults the Unicode character properties to determine which
1237 characters are graphic or printable. In particular, surrogates and
1238 unassigned codepoints are now rejected. If you want the old behavior,
1239 use [:multibyte:] instead.
1242 ** The `diff' command uses the unified format now. To restore the old
1243 behavior, set `diff-switches' to `-c'.
1245 ** `grep-template' and `grep-find-template' values don't include the
1246 --color argument anymore. It's added at the <C> place holder position
1247 dynamically. Any third-party code that changes these templates should
1248 be updated accordingly.
1251 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1252 The new behavior is compatible with Common Lisp and with XEmacs.
1253 This change does not affect Lisp code intended to be portable to
1254 Emacs 24.2 and earlier, which did not support unary ‘/’.
1257 ** The `default-directory' value doesn't have to end slash. To make
1258 that happen, `unhandled-file-name-directory' now defaults to calling
1259 `file-name-as-directory'.
1262 * Lisp Changes in Emacs 25.1
1265 *** New UPatterns `quote', `app', `cl-struct', `eieio', `seq', and `map'.
1266 *** New UPatterns can be defined with `pcase-defmacro'.
1268 *** New vector QPattern.
1270 ** syntax-propertize is now automatically called on-demand during forward
1271 parsing functions like `forward-sexp'.
1273 ** New hooks prefix-command-echo-keystrokes-functions and
1274 prefix-command-preserve-state-hook, to allow the definition of prefix
1275 commands other than the predefined C-u.
1277 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1279 ** The default value of `load-read-function' is now `read'.
1281 ** New hook `pre-redisplay-functions', a bit easier to use than pre-redisplay-function.
1283 ** The second arg of `looking-back' should always be provided explicitly.
1285 ** Obsolete text properties `intangible', `point-entered', and `point-left'.
1286 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1287 implemented by the new `cursor-intangible-mode' and
1288 `cursor-sensor-mode' minor modes.
1290 ** New process type `pipe', which can be used in combination with the
1291 `:stderr' keyword of make-process to handle standard error output
1294 ** New function `make-process' provides an alternative interface to
1295 `start-process'. It allows programs to set process parameters such as
1296 process filter, sentinel, etc., through keyword arguments (similar to
1297 `make-network-process').
1300 ** A new function `directory-files-recursively' returns all matching
1301 files (recursively) under a directory.
1304 ** New variable `inhibit-message', when bound to non-nil, inhibits
1305 `message' and related functions from displaying messages the Echo
1306 Area. The output is still logged to the *Messages* buffer.
1309 ** A new text property `inhibit-read-only' can be used in read-only
1310 buffers to allow certain parts of the text to be writable.
1313 ** A new variable `comment-end-can-be-escaped' is useful in languages
1314 such as C and C++ where line comments with escaped newlines are
1315 continued to the next line.
1318 ** New macro `define-advice'.
1320 ** `read-buffer' takes a new `predicate' argument.
1322 ** Emacs Lisp now supports generators.
1324 ** New finalizer facility for running code when objects
1327 ** lexical closures can use (:documentation <form>) to build their docstring.
1328 It should be placed right where the docstring would be, and <form> is then
1329 evaluated (and should return a string) when the closure is built.
1331 ** define-inline provides a new way to define inlinable functions.
1333 ** New function `macroexpand-1' to perform a single step of macroexpansion.
1335 ** Some "x-*" were obsoleted:
1336 *** x-select-text is renamed gui-select-text.
1337 *** x-selection-value is renamed gui-selection-value.
1338 *** x-get-selection is renamed gui-get-selection.
1339 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1340 *** x-get-selection-value is renamed to gui-get-primary-selection.
1341 *** x-set-selection is renamed to gui-set-selection
1343 ** New function `string-greaterp', which return the opposite result of
1347 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1348 preserve the collation order as defined by the system's locale(1)
1349 environment. For the time being this is implemented for modern POSIX
1350 systems and for MS-Windows, for other systems they fall back to their
1351 counterparts `string-lessp' and `string-equal'.
1354 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1355 If you want the old, locale-independent sorting, customize the new
1356 option `ls-lisp-use-string-collate' to a nil value.
1359 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1360 if set to a non-nil value, causes the above 2 functions to ignore
1361 symbol and punctuation characters when collating strings. This
1362 emulates the behavior of modern Posix platforms when the locale's
1363 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1364 MS-Windows doesn't support UTF-8 as codeset in its locales.
1366 ** New function `alist-get', which is also a valid place (aka lvalue).
1368 ** New function `funcall-interactively', which works like `funcall'
1369 but makes `called-interactively-p' treat the function as (you guessed it)
1370 called interactively.
1372 ** New function `function-put' to use instead of `put' for function properties.
1375 ** The new function `bidi-find-overridden-directionality' allows to
1376 find characters whose directionality was, perhaps maliciously,
1377 overridden by directional override control characters. Lisp programs
1378 can use this to detect potential phishing of URLs and other links that
1379 exploits bidirectional display reordering.
1382 ** The new function `buffer-substring-with-bidi-context' allows to
1383 copy a portion of a buffer into a different location while preserving
1384 the visual appearance both of the copied text and the text at
1385 destination, even when the copied text includes mixed bidirectional
1386 text and directional control characters.
1389 ** New properties that can be specified with `declare':
1390 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1391 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1392 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1396 ** New macro `with-file-modes', for evaluating expressions with default file
1397 permissions set to temporary values (e.g., for creating private files).
1399 ** You can access the slots of structures using `cl-struct-slot-value'.
1401 ** Function `sort' can deal with vectors.
1403 ** Function `system-name' now returns an updated value if the current
1404 system's name has changed or if the Emacs process has changed systems,
1405 and to avoid long waits it no longer consults DNS to canonicalize the
1406 name. The variable `system-name' is now obsolete.
1409 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1411 ** If `pwd' is called with a prefix argument, insert the current default
1415 ** New functions return extended information about fonts and faces.
1418 *** The function `font-info' now returns more details about a font.
1419 In particular, it now returns the average width of the font's
1420 characters, which can be used for geometry-related calculations.
1423 *** A new function `default-font-width' returns the average width of a
1424 character in the current buffer's default font. If the default face
1425 is remapped (see `face-remapping-alist'), the value for the remapped
1426 face is returned. This function complements the existing function
1427 `default-font-height'.
1430 *** New functions `window-font-height' and `window-font-width' return
1431 the height and average width of characters in a specified face and
1432 window. If FACE is remapped (see `face-remapping-alist'), the
1433 function returns the information for the remapped face.
1436 *** A new function `window-max-chars-per-line' returns the maximal
1437 number of characters that can be displayed on one line. If a face
1438 and/or window are provided, these values are used for the
1439 calculation. This function is different from `window-body-width' in
1440 that it accounts for (i) continuation glyphs, (ii) the size of the
1441 font, and (iii) the specified window.
1444 ** New utilities in subr-x.el:
1445 *** New macros `if-let' and `when-let' allow defining bindings and to
1446 execute code depending whether all values are true.
1447 *** New macros `thread-first' and `thread-last' allow threading a form
1448 as the first or last argument of subsequent forms.
1451 ** Documentation strings now support quoting with curved single quotes
1452 ‘like-this’ in addition to the old style with grave accent and
1453 apostrophe `like-this'. The new style looks better on today's displays.
1454 In the new Electric Quote mode, you can enter curved single quotes
1455 into documentation by typing ` and '. Outside Electric Quote mode,
1456 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1457 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1458 ‘text-quoting-style’, the user can specify how to display doc string
1462 ** New function ‘format-message’ is like ‘format’ and also converts
1463 curved single quotes, grave accents and apostrophes as per
1464 ‘text-quoting-style’.
1467 ** show-help-function's arg is converted via substitute-command-keys
1468 before being passed to the function. Help strings, help-echo
1469 properties, etc. can therefore contain command key escapes and
1473 ** Time-related changes:
1475 *** Time conversion functions now accept an optional ZONE argument
1476 that specifies the time zone rules for conversion. ZONE is omitted or
1477 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1478 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1479 rule. The affected functions are ‘current-time-string’,
1480 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1481 function ‘encode-time’, which already accepted a simple time zone rule
1482 argument, has been extended to accept all the new forms.
1484 *** Time-related functions now consistently accept numbers
1485 (representing seconds since the epoch) and nil (representing the
1486 current time) as well as the usual list-of-integer representation.
1487 Affected functions include `current-time-string', `current-time-zone',
1488 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1489 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1490 `time-to-days', and `time-to-seconds'.
1492 *** The `encode-time-value' and `with-decoded-time-value' macros have
1495 *** `calendar-next-time-zone-transition', `time-add', and
1496 `time-subtract' no longer return time values in the obsolete and
1497 undocumented integer-pair format. Instead, they return a list of two
1501 ** New function `set-binary-mode' allows to switch a standard stream
1502 of the Emacs process to binary I/O mode.
1505 ** The new function `directory-name-p' can be used to check whether a file
1506 name (as returned from, for instance, `file-name-all-completions') is
1507 a directory file name. It returns non-nil if the last character in
1508 the name is a directory separator character (forward slash on GNU and
1509 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1511 ** ASCII approximations to curved quotes are put in standard-display-table
1512 if the terminal cannot display curved quotes.
1514 ** Standard output and error streams now transliterate characters via
1515 standard-display-table, and encode output using locale-coding-system.
1518 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1521 ** New possible value for `system-type': `nacl'.
1522 This is used by Google's Native Client (NaCl).
1524 ** Miscellaneous name change
1526 For consistency with the usual Emacs spelling, the Lisp variable
1527 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1528 The old name should still work, as an obsolescent alias.
1531 * Changes in Frames and Windows Code in Emacs 25.1
1534 ** Emacs can now draw horizontal scroll bars on some platforms that
1535 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1536 Horizontal scroll bars are turned off by default.
1537 *** New function `horizontal-scroll-bars-available-p' telling whether
1538 horizontal scroll bars are available on the underlying system.
1539 *** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1540 bars on all existing and future frames.
1541 *** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1542 scroll bars on the selected frame.
1543 *** New frame parameters `horizontal-scroll-bars' and
1544 `scroll-bar-height' to set horizontal scroll bars and their height
1545 for individual frames and in `default-frame-alist'.
1546 *** New functions `frame-scroll-bar-height' and
1547 `window-scroll-bar-height' return the height of horizontal scroll
1548 bars on a specific frame or window.
1549 *** `set-window-scroll-bars' now accepts five parameters where the last
1550 two specify height and type of the window's horizontal scroll bar.
1551 *** `window-scroll-bars' now returns type and sizes of horizontal scroll
1553 *** New buffer-local variables `horizontal-scroll-bar' and
1554 `scroll-bar-height'.
1557 ** New functions `frame-geometry' and `frame-edges' give access to a
1561 ** New functions `mouse-absolute-pixel-position' and
1562 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1566 ** The function `window-edges' now accepts three additional arguments to
1567 retrieve body, absolute and pixel edges of the window.
1570 ** The functions `window-inside-edges', `window-inside-pixel-edges' and
1571 `window-inside-absolute-pixel-edges' have been renamed to respectively
1572 `window-body-edges', `window-body-pixel-edges' and
1573 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1576 ** New function `window-absolute-pixel-position' to get the screen
1577 coordinates of a visible buffer position.
1580 ** The height of a frame's menu and tool bar are no longer counted in the
1581 frame's text height. This means that the text height stands only for
1582 the height of the frame's root window plus that of the echo area (if
1583 present). This was already the behavior for frames with external tool
1584 and menu bars (like in the Gtk builds) but has now been extended to all
1588 ** Frames now do not necessarily preserve the number of columns or lines
1589 they display when setting default font, menu bar, fringe width, or
1590 scroll bars. In particular, maximized and fullscreen frames are
1591 conceptually never resized if such settings change. For fullheight and
1592 fullwidth frames, the behavior may depend on the toolkit used.
1593 *** New option `frame-inhibit-implied-resize' if non-nil, means that
1594 setting default font, menu bar, fringe width, or scroll bars of a
1595 specific frame does not resize that frame in order to preserve the
1596 number of columns or lines it displays.
1599 ** New function `window-preserve-size' allows to preserve the size of
1600 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1601 `temp-buffer-resize-mode' and `display-buffer'.
1604 ** New `display-buffer' action function `display-buffer-use-some-frame'.
1605 This displays the buffer in an existing frame other than the current
1606 frame, and allows the caller to specify a frame predicate to exclude
1610 ** New minor mode `window-divider-mode' and options
1611 `window-divider-default-places', `window-divider-default-bottom-width'
1612 and `window-divider-default-right-width'.
1614 ** Tearoff menus and detachable toolbars for Gtk+ has been removed.
1615 Those features have been deprecated in Gtk+ for a long time.
1619 *** etags no longer qualifies class members by default.
1621 By default, `etags' will not qualify class members for C-like
1622 object-oriented languages with their class names and namespaces, and
1623 will remove qualifications used explicitly in the code from the tag
1624 names it puts in TAGS files. This is so the etags.el back-end for
1625 `xref-find-definitions' is more accurate and produces less false
1628 Use --class-qualify (-Q) if you want the old default behavior of
1629 qualifying class members in C++, Java, and Objective C. Note that
1630 using -Q might make some class members become "unknown" to `M-.'
1631 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1632 qualified names by hand.
1634 *** New language Ruby
1636 Names of modules, classes, methods, and functions are tagged.
1637 Overloaded operators are also tagged.
1639 *** Improved support for Lua
1641 Etags now tags functions even if the "function" keyword follows some
1642 whitespace at line beginning.
1645 * Changes in Emacs 25.1 on Non-Free Operating Systems
1648 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1649 This includes the makefile.w32-in files in various subdirectories, and
1650 the support files. The file nt/configure.bat now just tells the user
1651 to use the procedure described in nt/INSTALL, by running the Posix
1652 `configure' script in the top-level directory.
1655 ** Building Emacs for MS-Windows requires at least Windows XP
1656 or Windows Server 2003. The built binaries still run on all versions
1657 of Windows starting with Windows 9X.
1660 ** Emacs running on MS-Windows now supports the daemon mode.
1662 ** The byte counts in etags-generated TAGS files are now the same on
1663 MS-Windows as they are on other platforms.
1666 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1667 Pass '--without-ns' to configure to create an X11 build, the old default.
1669 ** OS X 10.5 or older is no longer supported.
1671 ** OS X on PowerPC is no longer supported.
1674 ** New variable `ns-use-fullscreen-animation' controls animation for
1675 non-native NS fullscreen. The default is nil. Set to t to enable
1676 animation when entering and leaving fullscreen. For native OSX fullscreen
1680 ** The new function 'w32-application-type' returns the type of an
1681 MS-Windows application given the name of its executable program file.
1684 ----------------------------------------------------------------------
1685 This file is part of GNU Emacs.
1687 GNU Emacs is free software: you can redistribute it and/or modify
1688 it under the terms of the GNU General Public License as published by
1689 the Free Software Foundation, either version 3 of the License, or
1690 (at your option) any later version.
1692 GNU Emacs is distributed in the hope that it will be useful,
1693 but WITHOUT ANY WARRANTY; without even the implied warranty of
1694 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1695 GNU General Public License for more details.
1697 You should have received a copy of the GNU General Public License
1698 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1704 paragraph-separate: "[
\f]*$"