1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2014-2016 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 If possible, use M-x report-emacs-bug.
9 This file is about changes in Emacs version 25.
11 See file HISTORY for a list of GNU Emacs versions and release dates.
12 See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
13 and NEWS.1-17 for changes in older Emacs versions.
15 You can narrow news to a specific version by calling `view-emacs-news'
16 with a prefix argument or by typing C-u C-h C-n.
19 +++ indicates that all necessary documentation updates are complete.
20 (This means all relevant manuals in doc/ AND lisp doc-strings.)
21 --- means no change in the manuals is needed.
22 When you add a new item, use the appropriate mark if you are sure it applies,
23 otherwise leave it unmarked.
26 * Installation Changes in Emacs 25.2
28 ** 'configure' detects the kqueue file notification library on *BSD
29 and Mac OS X machines.
32 * Startup Changes in Emacs 25.2
35 * Changes in Emacs 25.2
37 ** It is possible to disable attempted recovery on fatal signals
39 Two new variables allow to disable attempts to recover from stack
40 overflow and to avoid automatic auto-save when Emacs is delivered a
41 fatal signal. `attempt-stack-overflow-recovery', if set to `nil',
42 will disable attempts to recover from C stack overflows; Emacs will
43 then crash as with any other fatal signal.
44 `attempt-orderly-shutdown-on-fatal-signal', if set to `nil', will
45 disable attempts to auto-save the session and shut down in an orderly
46 fashion when Emacs receives a fatal signal; instead, Emacs will
47 terminate immediately. Both variables are non-`nil' by default.
48 These variables are for users who would like to avoid the small
49 probability of data corruption due to techniques Emacs uses to recover
53 * Editing Changes in Emacs 25.2
56 * Changes in Specialized Modes and Packages in Emacs 25.2
60 *** The kqueue library is integrated for *BSD and Mac OS X machines.
63 * New Modes and Packages in Emacs 25.2
66 * Incompatible Lisp Changes in Emacs 25.2
69 * Lisp Changes in Emacs 25.2
71 ** Autoload files can be generated without timestamps,
72 by setting `autoload-timestamps' to nil.
75 * Changes in Emacs 25.2 on Non-Free Operating Systems
78 * Installation Changes in Emacs 25.1
81 ** Building Emacs now requires C99 or later.
84 ** Building Emacs now requires GNU make, version 3.81 or later.
87 ** New configure option --with-cairo.
88 This builds Emacs with Cairo drawing. As a side effect, it provides
89 support for built-in printing, when Emacs was built with GTK+.
91 ** New configure option --with-modules.
92 This enables support for loading dynamic modules; see below.
95 ** By default, Emacs no longer works on IRIX. We expect that Emacs
96 users are not affected by this, as SGI stopped supporting IRIX in
97 December 2013. If you are affected, please send a bug report. You
98 should be able to work around the problem either by porting the Emacs
99 undumping code to GCC under IRIX, or by configuring --with-wide-int,
100 or by sticking with Emacs 24.4.
103 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
104 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
105 since Emacs 24.4, and the other variants were undocumented and were
106 obstacles to maintenance and development. GC_MARK_STACK and its
107 related symbols have been removed from the C internals.
110 ** 'configure' now prefers gnustep-config when configuring GNUstep.
111 If gnustep-config is not available, the old heuristics are used.
114 ** 'configure' now prefers inotify to gfile for file notification,
115 unless gfile is explicitly requested via --with-file-notification='gfile'.
118 ** The configure option '--with-pkg-config-prog' has been removed.
119 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
122 ** The configure option '--with-mmdf' has been removed.
123 It was no longer useful, as it relied on libraries that are no longer
124 supported, and its presence led to confusion during configuration.
125 This affects only the 'movemail' utility; Emacs itself can still
126 process MMDF-format files as before.
129 ** The configure option '--enable-silent-rules' is now the default,
130 and silent rules are now quieter. To get the old behavior where
131 'make' chatters a lot, configure with '--disable-silent-rules' or
132 build with 'make V=1'.
135 ** The configure option '--with-gameuser' now allows to specify a
136 group instead of a user if its argument is prefixed by ':' (a colon).
137 This will cause the game score files in ${localstatedir}/games/emacs
138 to be owned by that group, and the helper program for updating them to
139 be installed setgid. The option now defaults to the 'games' group.
142 ** The `grep-changelog' script (and its manual page) are no longer included.
143 It has no particular connection to Emacs and has not changed in years,
144 so if you want to use it, you can always take a copy from an older Emacs.
147 ** Emacs 25 comes with a new set of icons.
148 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
149 The old Emacs logo icons are available as `emacs23.png' in the same location.
152 * Startup Changes in Emacs 25.1
155 ** When Emacs is given a file as a command line argument and
156 `initial-buffer-choice' is non-nil, display both the file and
157 `initial-buffer-choice'. When Emacs is given more than one file and
158 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
159 and *Buffer List*. This makes Emacs convenient to use from the
160 command line when `initial-buffer-choice' is non-nil.
163 ** The value of ‘initial-scratch-message’ is now treated as a doc string
164 and can contain escape sequences for command keys, quotes, and the like.
167 * Changes in Emacs 25.1
169 ** Emacs can now load shared/dynamic libraries (modules).
170 A dynamic Emacs module is a shared library that provides additional
171 functionality for use in Emacs Lisp programs, just like a package
172 written in Emacs Lisp would. The functions `load', `require',
173 `load-file', etc. were extended to load such modules, as they do with
174 Emacs Lisp packages. The new variable `module-file-suffix' holds the
175 system-dependent value of the file-name extension (`.so' on Posix
176 hosts) of the module files.
178 A module should export a C-callable function named
179 `emacs_module_init', which Emacs will call as part of the call to
180 `load' or `require' which loads the module. It should also export a
181 symbol named `plugin_is_GPL_compatible' to indicate that its code is
182 released under the GPL or compatible license; Emacs will refuse to
183 load modules that don't export such a symbol.
185 If a module needs to call Emacs functions, it should do so through the
186 API defined and documented in the header file `emacs-module.h'. Note
187 that any module that provides Lisp-callable functions will have to use
188 Emacs functions such as `fset' and `funcall', in order to register its
189 functions with the Emacs Lisp interpreter.
191 Modules can create `user-ptr' Lisp objects that embed pointers to C
192 struct's defined by the module. This is useful for keeping around
193 complex data structures created by a module, to be passed back to the
194 module's functions. User-ptr objects can also have associated
195 "finalizers" -- functions to be run when the object is GC'ed; this is
196 useful for freeing any resources allocated for the underlying data
197 structure, such as memory, open file descriptors, etc. A new
198 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
201 Loadable modules in Emacs are an experimental feature, and subject to
202 change in future releases. For that reason, their support is disabled
203 by default, and must be enabled by using the `--with-modules' option
207 ** Any file of the form .dir-locals*.el is now considered a dir-local
208 file, and multiple such files can be used in the same directory. See
209 the variable `dir-locals-file' for more information.
212 ** Network security (TLS/SSL certificate validity and the like) is
213 added via the new Network Security Manager (NSM) and controlled via
214 the `network-security-level' variable.
217 ** International domain names (IDNA) are now encoded via the new
218 puny.el library, so that one can visit web sites like
219 "http://méxico.icom.museum".
221 ** If Emacs isn't built with TLS support, an external TLS-capable
222 program is used instead. This program used to be run in --insecure
223 mode by default, but has now changed to be secure instead, and will
224 fail if you try to connect to non-verifiable hosts. This is
225 controlled by the `tls-program' variable.
228 ** C-h l now also lists the commands that were run.
230 ** The new M-s M-w key binding uses eww to search the web for the
233 ** M-x suggests shorthands and ignores obsolete commands for completion.
234 ** x-select-enable-clipboard is renamed select-enable-clipboard.
235 x-select-enable-primary and renamed select-enable-primary.
236 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
237 name it), with the proviso that on some systems (e.g. Windows)
238 select-enable-primary is ineffective since the system doesn't
239 have the equivalent of a primary selection.
242 ** New option `switch-to-buffer-in-dedicated-window' allows to customize
243 how `switch-to-buffer' proceeds interactively when the selected window
244 is strongly dedicated to its buffer.
247 ** The option `even-window-heights' has been renamed to
248 `even-window-sizes' and now handles window widths as well.
251 ** terpri gets an optional arg ENSURE to conditionally output a newline.
254 ** `insert-register' now leaves point after the inserted text
255 when called interactively. A prefix argument toggles this behavior.
258 ** The new variable `term-file-aliases' replaces some files from lisp/term.
259 The function `tty-run-terminal-initialization' consults this variable
260 when deciding what terminal-specific initialization code to run.
263 ** New variable `system-configuration-features', listing some of the
264 main features that Emacs was compiled with. This is mainly intended
265 for use in Emacs bug reports.
268 ** A password is now hidden also when typed in batch mode. Another
269 hiding character but the default `.' can be used by let-binding the
270 variable `read-hide-char'.
273 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
276 * Editing Changes in Emacs 25.1
279 ** M-x suggests shorthands and ignores obsolete commands for completion.
284 *** Successive single-char deletions are collapsed in the undo-log just like
285 successive char insertions. Which commands invoke this behavior is
286 controlled by the new `undo-auto-amalgamate' function. See the node
287 "Undo" in the ELisp manual for more details.
290 *** The heuristic used to insert `undo-boundary' after each command
291 has changed, so that if a command causes changes in more than just the
292 current buffer, Emacs now calls `undo-boundary' in every buffer
293 affected by the command.
296 ** New command `comment-line' bound to `C-x C-;'.
298 ** New and improved facilities for inserting Unicode characters
301 *** Unicode names entered via C-x 8 RET now use substring completion by default.
304 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
305 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
308 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
309 as you type. See also the new variable ‘text-quoting-style’.
312 ** New minor mode global-eldoc-mode is enabled by default.
315 ** Emacs now supports "bracketed paste mode" when running on a terminal
316 that supports it. This facility allows Emacs to understand pasted
317 chunks of text as strings to be inserted, instead of interpreting each
318 character in the pasted text as actual user input. This results in a
319 paste experience similar to that under a window system, and significant
320 performance improvements when pasting large amounts of text.
323 ** Emacs now supports the latest version of the UBA.
324 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
325 was updated to support all the latest additions and changes introduced
326 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
327 This includes full support for directional isolates and the
328 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
332 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
335 ** New buffer-local `electric-pair-local-mode'.
338 ** New variable `fast-but-imprecise-scrolling' inhibits
339 fontification during full screen scrolling operations, giving less
340 hesitant operation during auto-repeat of C-v, M-v at the cost of
341 possible inaccuracies in the end position.
344 ** New documentation command `describe-symbol'.
345 Works for functions, variables, faces, etc. It is bound to `C-h o' by
349 ** New function `custom-prompt-customize-unsaved-options' checks for
350 unsaved customizations and prompts user to customize (if found). It
351 is intended for adding to 'kill-emacs-query-functions'.
354 * Changes in Specialized Modes and Packages in Emacs 25.1
359 *** New command `checkdoc-package-keywords' checks if the
360 current package keywords are recognized. Set the new option
361 `checkdoc-package-keywords-flag' to non-nil to make
362 `checkdoc-current-buffer' call this function automatically.
365 *** New function `checkdoc-file' checks for style errors.
366 It's meant for use together with `compile':
367 emacs -batch --eval "(checkdoc-file \"subr.el\")"
370 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
371 It raises an error if a bookmark of that name already exists,
372 unlike `bookmark-set' which silently updates an existing bookmark.
377 *** `imap-ssl-program' has been removed, and imap.el uses the internal
378 GnuTLS encryption functions if possible.
383 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
384 the ordering of object keys by default.
387 *** New commands `json-pretty-print-ordered' and
388 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
389 object keys sorted alphabetically.
392 ** Prog mode has some support for multi-mode indentation.
393 This allows better indentation support in modes that support multiple
394 programming languages in the same buffer, like literate programming
395 environments or ANTLR programs with embedded Python code.
397 A major mode can provide indentation context for a sub-mode through
398 the `prog-indentation-context' variable. To support this, modes that
399 provide indentation should use `prog-widen' instead of `widen' and
400 `prog-first-column' instead of a literal zero. See the node
401 "Mode-Specific Indent" in the ELisp manual for more details.
403 ** Prettify Symbols mode
406 *** Prettify Symbols mode supports custom composition predicates. By
407 overriding the default `prettify-symbols-compose-predicate', modes can
408 specify in which contexts a symbol may be displayed as some Unicode
409 character. `prettify-symbols-default-compose-p' is the default which
410 is suitable for most programming languages such as C or Lisp (but not
414 *** Symbols can be unprettified while point is inside them.
415 New variable `prettify-symbols-unprettify-at-point' configures this.
417 ** Enhanced xterm support
420 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
421 This variable tells Emacs which advanced capabilities are available in
422 the xterm terminal emulator used to display Emacs text-mode frames.
423 The default is to check each capability, and use it if available.
424 (This variable was introduced in Emacs 24.1, but was not announced in
428 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
429 in the surrounding GUI (using the OSC-52 escape sequence). This only works
430 if your xterm supports it and enables the `allowWindowOps' options (disabled
431 by default at least in Debian, for security reasons).
433 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
434 escape sequence) if your xterm has the feature enabled but for that you
435 additionally need to add `getSelection' to `xterm-extra-capabilities'.
438 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
441 ** The `save-place' variable is replaced by `save-place-mode'.
446 *** ERC can now hide message types by network or channel.
447 `erc-hide-list' will hide all messages of the specified type, while
448 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
449 specified message types for the respective specified targets.
451 *** New variable `erc-default-port-tls' used to connect to TLS IRC
457 *** `midnight-mode' is now a proper minor mode.
460 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
465 *** New "external" package status.
466 An external package is any installed package that's not built-in and
467 not from `package-user-dir', which usually means it's from an entry in
468 `package-directory-list'. They are treated much like built-in
469 packages, in that they cannot be deleted through the package menu and
470 are not considered for upgrades.
472 The effect is that a user can manually place a specific version of a
473 package inside `package-directory-list' and the package menu will
477 *** If a package is available on multiple archives and one has higher
478 priority (as per `package-archive-priorities') only that one is
479 listed. This can be configured with `package-menu-hide-low-priority'.
482 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
483 This includes the above-mentioned low-priority packages, as well as
484 available packages whose version is lower than the currently installed
485 version (which were previously impossible to display).
486 This allows users to downgrade a package if a lower version is
490 *** When filtering the package menu, keywords starting with "arc:" or
491 "status:" represent package archive or status, respectively, instead
495 *** Most functions which involve downloading information now take an
496 ASYNC argument. If it is non-nil, package.el performs the download(s)
500 *** New variable `package-menu-async' controls whether the
501 package-menu uses asynchronous downloads.
504 *** `package-install-from-buffer' and `package-install-file' work on directories.
505 This follows the same rules as installing from a .tar file, except the
506 -pkg file is optional.
509 *** Packages which are dependencies of other packages cannot be deleted.
510 The FORCE argument to `package-delete' overrides this.
513 *** New custom variable `package-selected-packages' tracks packages
514 which were installed by the user (as opposed to installed as
515 dependencies). This variable can also be manually customized.
518 *** New command `package-install-user-selected-packages' installs all
519 packages from `package-selected-packages' which are currently missing.
522 *** New command `package-autoremove' removes all packages which were
523 installed strictly as dependencies but are no longer needed.
528 When you invoke `shell' interactively, the *shell* buffer will now
529 display in a new window. However, you can customize this behavior via
530 the `display-buffer-alist' variable. For example, to get
531 the old behavior -- *shell* buffer displays in current window -- use
532 (add-to-list 'display-buffer-alist
533 '("^\\*shell\\*$" . (display-buffer-same-window))).
537 *** The `:protection' slot option is not obeyed any more.
539 *** The `newname' argument to constructors is optional&deprecated.
540 If you need your objects to be named, do it by inheriting from `eieio-named'.
542 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
544 *** The <class> variables are declared obsolete.
546 *** The <initarg> variables are declared obsolete.
547 *** defgeneric and defmethod are declared obsolete.
549 *** `constructor' is now an obsolete alias for `make-instance'.
554 *** New command `ido-bury-buffer-at-head' bound to C-S-b
555 Bury the buffer at the head of `ido-matches', analogous to how C-k
556 kills the buffer at head.
559 *** A prefix argument to `ido-restrict-to-matches' will reverse its
560 meaning, and the list is restricted to those elements that do not
561 match the current input.
566 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
567 The new commands `next-line-or-history-element' and
568 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
569 minibuffer, allow by-line movement through minibuffer history,
570 similarly to an ordinary buffer. Only when point moves over
571 the bottom/top of the minibuffer it goes to the next/previous history
572 element. `M-p' and `M-n' still move directly to previous/next history
575 ** Search and Replace
578 *** New user option `search-default-regexp-mode'
579 specifies the default mode for I-search.
582 *** `isearch' and `query-replace' can now perform character folding in matches.
583 Isearch does that by default, while `query-replace' will do that if
584 the new variable `replace-character-fold' is customized to a non-nil
585 value. This is analogous to case folding, but instead of disregarding
586 case variants, it disregards wider classes of distinctions between
587 similar characters. (Case folding is a special case of character
588 folding.) This means many characters in the search string will match
589 entire groups of characters instead of just themselves.
591 For instance, the " will match all variants of double quotes (like “
592 and ”), and the letter a will match all of its accented cousins, even
593 those composed of multiple characters, as well as many other symbols
597 *** New function `character-fold-to-regexp' can be used
598 by searching commands to produce a regexp matching anything that
599 character-folds into STRING.
602 *** The new M-s M-w key binding uses eww to search the web for the
603 text in the region. The search engine to use for this is specified by
604 the customizable variable `eww-search-prefix'.
607 *** Query-replace history is enhanced.
608 When query-replace reads the FROM string from the minibuffer, typing
609 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
610 and TO are the original text and its replacement, and SEP is an arrow
611 string defined by the new variable `query-replace-from-to-separator'.
612 To select a prior replacement, type `M-p' until the desired
613 replacement appears in the minibuffer, and then exit the minibuffer by
618 *** If `quick-calc' is called with a prefix argument, insert the
619 result of the calculation into the current buffer.
622 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
623 this you can tell Edebug not to stop at the start of the first
624 instrumented function.
629 *** New minor mode `global-eldoc-mode'
630 It is turned on by default, and affects `*scratch*' and other buffers
631 whose major mode supports Emacs Lisp.
634 *** `eldoc-documentation-function' now defaults to `ignore'
637 *** `describe-char-eldoc' displays information about character at point,
638 and can be used as a default value of `eldoc-documentation-function'. It is
639 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
640 ] [, ] [, etc.) while using mono-spaced font.
645 *** HTML can now be rendered using variable-width fonts.
648 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
649 whether to use variable-pitch fonts or not. The user can also
650 customize the `shr-use-fonts' variable.
653 *** A new command `C' (`eww-toggle-colors') can be used to toggle
654 whether to use the HTML-specified colors or not. The user can also
655 customize the `shr-use-colors' variable.
658 *** A new command `R' (`eww-readable') will try do identify the main
659 textual parts of a web page and display only that, leaving menus and
660 the like off the page.
663 *** You can now use several eww buffers in parallel by renaming eww
664 buffers you want to keep separate.
667 *** Partial state of the eww buffers (the URIs and the titles of the
668 pages visited) is now preserved in the desktop file.
671 *** `eww-after-render-hook' is now called after eww has rendered
672 the data in the buffer.
675 *** The `eww-reload' command now takes a prefix to not reload via
676 the net, but just use the local copy of the HTML.
679 *** The DOM shr and eww uses has been changed to the general Emacs
680 xml.el/libxml2 DOM, and a new package dom.el has been added to
681 interact with this DOM. See the Emacs Lisp manual for interface
685 *** `mailcap-mime-data' is now consulted when displaying PDF files.
688 *** The new `S' command will list all eww buffers, and allow managing
692 *** https pages with valid certificates have headers marked in green, while
693 invalid certificates are marked in red.
698 *** text/html messages that contain inline image parts will be
699 transformed into multipart/related messages before sending.
702 ** In Show Paren Mode, a parenthesis can be highlighted when point
703 stands inside it, and certain parens can be highlighted when point is
704 at BOL or EOL, or in whitespace there. To enable these, customize,
705 respectively, `show-paren-when-point-inside-paren' or
706 `show-paren-when-point-in-periphery'.
711 *** Strings after `:documentation' are highlighted as docstrings.
712 This enhances Lisp mode fontification to handle documentation of the
713 form `(:documentation "the doc string")' used in Common Lisp code for
714 CLOS class and slot documentation.
719 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
722 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
723 *** `string-rectangle' provides on-the-fly preview of the result.
726 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
727 These should be used in preference to `font-lock-fontify-buffer' when
731 ** Macro `minibuffer-with-setup-hook' can optionally append a function
732 to `minibuffer-setup-hook'.
734 If the first argument of the macro is of the form `(:append FUN)',
735 then FUN will be appended to `minibuffer-setup-hook', instead of
740 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
742 ** Calendar and diary
745 *** The default `diary-file' is now located in .emacs.d.
748 *** New commands to insert diary entries with Chinese dates:
749 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
750 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
753 *** The calendar can now list and mark diary entries with Chinese dates.
754 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
757 *** The option `calendar-mode-line-format' can now be nil,
758 which means to do nothing special with the mode line in calendars.
761 *** New option `calendar-weekend-days'.
762 The option customizes which day headers receive the
763 `calendar-weekend-header' face.
766 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
769 *** Many items obsolete since at least version 23.1 have been removed.
770 The majority were function/variable/face aliases, too numerous to list here.
773 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
774 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
776 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
778 **** Macro `calendar-for-loop'.
780 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
782 **** The nil and list forms of `diary-display-function'.
785 ** New ERT function `ert-summarize-tests-batch-and-exit'.
786 If the output of ERT tests in batch mode execution can be saved to a
787 log file, then it can be passed as an argument to the above function
788 to produce a neat summary.
790 ** New js.el option `js-indent-first-init'.
795 ** Info mode now displays symbol names in fixed-pitch font.
796 If you want to get the old behavior back, customize the `Info-quoted'
797 face to use the same definitions as the default face.
800 *** `Info-fontify-maximum-menu-size' can be t for no limit.
803 *** `info-display-manual' can now be given a prefix argument which (any
804 non-nil value) directs the command to limit the completion
805 alternatives to currently visited manuals.
808 ** ntlm.el has support for NTLM2.
813 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
814 to delete or undelete multiple messages.
817 *** Rmail can now render HTML mail messages if your Emacs was built with
818 libxml2 or if you have the Lynx browser installed. By default, Rmail
819 will display the HTML version of a mail message that has both HTML and
820 plain text parts, if display of HTML email is possible; customize the
821 `rmail-mime-prefer-html' option to `nil' if you don't want that.
824 *** In the commands that make summaries by subject, recipients, or senders,
825 you can no longer use commas to separate regular expressions.
828 ** SES now supports local printer functions; see `ses-define-local-printer'.
832 *** In sh-mode you can now use `sh-shell' as a file-local variable to
833 specify the type of shell in use (bash, csh, etc).
836 *** New value `always' for `sh-indent-after-continuation'.
837 This provides old-style ("dumb") indentation of continued lines.
838 See the doc string of `sh-indent-after-continuation' for details.
842 *** Fatal TLS errors are now silent by default.
847 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
848 When `url-handler-mode' is enabled, file operations for these
849 protocols as well as for "telnet" and "ftp" are passed to Tramp.
852 *** The URL package allows customizing the `url-user-agent' string.
853 The new `url-user-agent' variable can be customized to be a string or
857 *** The new interface variable `url-request-noninteractive' can be used
858 to specify that we're running in a noninteractive context, and that
859 we should not be queried about things like TLS certificate validity.
862 *** If URL is used with a https connection, the first callback argument
863 plist will contain a :peer element that has the output of
864 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
869 *** New connection method "afp", which allows to access Mac OS X
870 volumes via the Apple Filing Protocol.
873 *** New connection method "nc", which allows to access dumb busyboxes.
876 *** Method-specific parameters can be overwritten now with variable
877 `tramp-connection-properties'.
880 *** Handler for `file-notify-valid-p' for remote machines that support
881 filesystem notifications.
886 *** New user variable `sql-default-directory' enables remote
887 connections using Tramp.
890 *** New command `sql-send-line-and-next'.
891 This command, bound to `C-c C-n' by default, sends the current line to
892 the SQL process and advances to the next line, skipping whitespace and
896 *** Added support for Vertica SQL.
898 ** VC and related modes
901 *** Basic push support, via `vc-push', bound to `C-x v P'.
902 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
903 (undocumented) command vc-hg-push now behaves slightly differently.
906 *** The new command vc-region-history shows the log+diff of the active region.
909 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
910 This command is useful when you perform version control commands
911 outside Emacs (e.g., from the shell prompt), or if you switch the VC
912 back-end for the buffer's file, or remove it from version control.
915 *** New option `vc-annotate-background-mode' controls whether
916 the color range from `vc-annotate-color-map' is applied to the
917 background or to the foreground.
920 *** `compare-windows' now compares text with the most recently selected window
921 instead of the next window. If you want the previous behavior of
922 comparing with the next window, customize the new option
923 `compare-windows-get-window-function' to the value
924 `compare-windows-get-next-window'.
927 *** Two new faces `compare-windows-removed' and `compare-windows-added'
928 replace the face `compare-windows', which is now an obsolete alias for
929 `compare-windows-added'.
932 *** `log-edit-insert-changelog' converts "(tiny change)" to
933 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
937 ** VHDL mode now supports VHDL'08.
942 *** Decimal display mode uses "," groups, so it's more
943 fitting for use in money calculations
946 *** Factorial works with non-integer inputs.
951 *** Hide-IfDef mode now support full C/C++ expressions in macros,
952 macro argument expansion, interactive macro evaluation and automatic
953 scanning of #define'd symbols.
956 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
957 result of evaluating a macro.
960 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
961 all defined symbols in `hide-ifdef-env'.
964 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
965 file name patterns. Defaults to files whose extension is one of `.h',
966 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
969 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
970 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
971 (This could happen when an idempotent header file is visited again,
972 when its guard symbol is already defined.) Defaults to `t'.
975 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
976 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
977 looking for macro definitions. By default, no symbols are ignored.
982 *** New custom variable `tex-print-file-extension' to help users who
983 use PDF instead of DVI.
986 *** TeX mode now supports Prettify Symbols mode. When enabling
987 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
988 many other math macros are displayed using unicode characters.
991 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
992 By default, 32 consecutive spaces or four consecutive TABs are
993 considered to be too deep, but the new variable
994 `whitespace-big-indent-regexp' can be customized to change that.
997 ** New options in `tildify-mode'.
998 New options `tildify-space-string', `tildify-pattern', and
999 `tildify-foreach-region-function' variables make
1000 `tildify-string-alist', `tildify-pattern-alist', and
1001 `tildify-ignored-environments-alist' variables (as well as a few
1002 helper functions) obsolete.
1004 ** New package Xref replaces Etags's front-end and UI
1006 The new package Xref provides a generic framework and new commands to
1007 find and move to definitions of functions, macros, data structures
1008 etc., as well as go back to the location where you were before moving
1009 to a definition. It supersedes and obsoletes many Etags commands,
1010 while still using the etags.el code that reads the TAGS tables as one
1013 The command `xref-find-definitions' replaces `find-tag' and provides
1014 an interface to pick one definition among several.
1015 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
1016 `pop-tag-mark', but has a keybinding (`M-,'), unlike `pop-tag-mark'.
1018 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
1019 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1020 `xref-find-apropos' replaces `find-tag-regexp'.
1022 As a result of this, the following commands are now obsolete:
1023 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1024 `tags-apropos', and `tags-loop-continue'.
1026 The framework's API is still experimental and can change in major,
1027 backward-incompatible ways.
1031 `find-tag-marker-ring-length' is now an obsolete alias for
1032 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1033 alias for a private variable. `xref-push-marker-stack' and
1034 `xref-pop-marker-stack' should be used to mutate it instead.
1037 *** `xref-find-definitions' and `describe-function' now display
1038 information about mode local overrides (defined by cedet/mode-local.el
1039 `define-overloadable-function' `define-mode-local-overrides').
1042 EUDC's LDAP backend has been improved.
1044 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1046 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1047 subprocess instead of on the command line.
1049 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1050 need to configure this manually anymore.
1052 *** The LDAP configuration section of EUDC's manual has been
1055 There have also been customization changes.
1057 *** New custom variable `eudc-server-hotlist' to allow specifying
1058 multiple EUDC servers in init file.
1060 *** Custom variable `eudc-inline-query-format' defaults to completing
1061 on email and firstname instead of surname.
1063 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1064 to avoid interfering with the kill ring.
1066 *** Custom variable `eudc-inline-expansion-format' defaults to
1067 "Firstname Surname <mail-address>".
1069 *** Custom variable `eudc-options-file' defaults to
1070 "~/.emacs.d/eudc-options".
1072 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1073 allow overriding the regular expression that recognizes the ldapsearch
1074 command line's password prompt.
1076 EUDC's BBDB backend now supports BBDB 3.
1078 EUDC's PH backend (eudcb-ph.el) is obsolete.
1083 *** The new built-in command `clear' can scroll window contents out of sight.
1084 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1086 *** New buffer syntax '#<buffer-name>', which is equivalent to
1087 '#<buffer buffer-name>'. This shorthand makes interacting with
1088 buffers from eshell more convenient. Custom variable
1089 `eshell-buffer-shorthand', which has been broken for a while, has been
1092 *** By default, eshell "visual" program buffers (created by
1093 `eshell-visual-commands' and similar custom vars) are no longer killed
1094 when their processes die. This fixes issues with short-lived commands
1095 and makes visual programs more useful in general. For example, if
1096 "git log" is a visual command, it will always show the visual command
1097 buffer, even if the "git log" process dies. For the old behavior,
1098 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1102 *** Support for the Conkeror web browser.
1105 *** Support for several ancient browsers is now officially obsolete.
1108 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1109 be added to the archive.
1112 ** Autorevert: dired buffers are also auto-reverted via file
1113 notifications, if Emacs is compiled with file notification support.
1115 ** File Notifications
1118 *** The new event `stopped' signals, that a file notification watch is
1119 not active any longer.
1122 *** The new function `file-notify-valid-p' checks, whether a file
1123 notification descriptor still corresponds to an activate watch.
1128 *** The command `dired-do-compress' bound to `Z' now can compress
1129 directories and decompress zip files.
1132 *** New command `dired-do-compress-to' bound to `c' can be used to
1133 compress many marked files into a single named archive. The
1134 compression command is determined from the new
1135 `dired-compress-files-alist' variable.
1138 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1139 viewing HTML files and the like.
1141 ** Tabulated List Mode
1144 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1145 call `tabulated-list-init-header', in which case it will have no
1149 *** `tabulated-list-print' takes a second optional argument, update,
1150 which specifies an alternative printing method which is faster when
1151 few or no entries have changed.
1153 ** Obsolete packages
1158 *** landmark.el (moved to elpa.gnu.org)
1161 * New Modes and Packages in Emacs 25.1
1163 ** pinentry.el allows GnuPG passphrase to be prompted through the
1164 minibuffer instead of a graphical dialog, depending on whether the gpg
1165 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1166 is set). This feature requires newer versions of GnuPG (2.1.5 or
1167 later) and Pinentry (0.9.5 or later).
1169 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1171 ** scss-mode (a minor variant of css-mode)
1173 ** let-alist is a new macro (and a package) that allows one to easily
1174 let-bind the values stored in an alist.
1176 ** `tildify-mode' allows to automatically insert hard spaces as one
1177 types the text. Breaking line after a single-character words is
1178 forbidden by Czech and Polish typography (and may be discouraged in
1179 other languages), so `auto-tildify-mode' makes it easier to create
1180 a typographically-correct documents.
1182 ** The `seq' library adds sequence manipulation functions and macros
1183 that complement basic functions provided by subr.el. All functions
1184 are prefixed with `seq-' and work on lists, strings and vectors.
1186 ** The `map' library provides map-manipulation functions that work on
1187 alists, hash-table and arrays. All functions are prefixed with
1190 ** The `thunk' library provides functions and macros to control the
1191 evaluation of forms.
1193 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1194 support for JSX, an XML-like syntax extension to ECMAScript.
1197 * Incompatible Lisp Changes in Emacs 25.1
1200 ** `setq' and `setf' must now be called with an even number of
1201 arguments. The earlier behavior of silently supplying a nil to the
1202 last variable when there was an odd number of arguments has been
1205 ** `syntax-begin-function' is declared obsolete.
1206 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1207 slot in font-lock-defaults.
1210 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1211 called during startup. Users who call this function in their init
1212 file and still expect it to be run after startup should set
1213 `package-enable-at-startup' to t after the call to
1214 `package-initialize'.
1216 ** `:global' minor mode use `setq-default' rather than `setq'.
1217 This means that you can't use `make-local-variable' and expect them to
1218 "magically" become buffer-local.
1220 ** `inhibit-point-motion-hooks' now defaults to t and is obsolete.
1223 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1224 The `track-mouse' form no longer refrains from changing the shape of
1225 the mouse pointer for the entire time the body of that form is
1226 executed. Lisp programs that use `track-mouse' for dragging across
1227 large portions of the Emacs display, and want to avoid changes in the
1228 pointer shape during dragging, should bind the variable `track-mouse'
1229 to the special value `dragging' in the body of the form.
1232 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1233 has any effect. (This change was made in Emacs 24.4 but was not
1234 advertised at the time.)
1236 ** `indirect-function' does not signal `void-function' any more.
1237 This is mostly a bug-fix, since this change was missed back in 24.4 when
1238 symbol-function was changed not to signal `void-function' any more.
1240 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1242 ** Comint, term, and compile do not set the EMACS env var any more.
1243 Use the INSIDE_EMACS environment variable instead.
1245 ** `save-excursion' does not save&restore the mark any more.
1247 ** read-buffer-function can now be called with a 4th argument (`predicate').
1249 ** completion-table-dynamic stays in the minibuffer.
1250 If you want the old behavior of calling the function in the buffer
1251 from which the minibuffer was entered, call it with the new argument
1254 ** window-configurations no longer record the buffers' marks.
1256 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1257 active region handling.
1259 ** deactivate-mark is now buffer-local.
1261 ** `cl-the' now asserts that its argument is of the given type.
1263 ** `process-running-child-p` may now return a numeric process
1264 group ID instead of `t'.
1267 ** Mouse click events on mode line or header line no longer include
1268 any reference to a buffer position. The 6th member of the mouse
1269 position list returned for such events is now nil.
1271 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1272 These slots used to hold key-shortcut data, but have been obsolete since
1275 ** Emacs no longer downcases the first letter of a system diagnostic
1276 when signaling a file error. For example, it now reports "Permission
1277 denied" instead of "permission denied". The old behavior was problematic
1278 in languages like German where downcasing rules depend on grammar.
1281 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1282 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1283 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1284 and apostrophe `like this'. The default value nil acts like ‘curve’
1285 if curved single quotes are displayable, and like ‘grave’ otherwise.
1286 The new variable affects display of diagnostics and help, but not of info.
1289 ** substitute-command-keys now replaces quotes.
1290 That is, it converts documentation strings’ quoting style as per the
1291 value of ‘text-quoting-style’. Doc strings in source code can use
1292 either curved single quotes or grave accents and apostrophes. As
1293 before, characters preceded by \= are output as-is.
1296 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1297 They use the new ‘format-message’ function instead of plain ‘format’,
1298 so that they now follow user preference as per ‘text-quoting-style’
1299 when processing curved single quotes, grave accents, and apostrophes
1300 in their format argument.
1303 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1304 now match multibyte characters using Unicode character properties.
1305 If you want the old behavior where they matched any character with
1306 word syntax, use `\sw' instead.
1309 ** The character classes [:graph:] and [:print:] in regular expressions
1310 no longer match every multibyte character. Instead, Emacs now
1311 consults the Unicode character properties to determine which
1312 characters are graphic or printable. In particular, surrogates and
1313 unassigned codepoints are now rejected. If you want the old behavior,
1314 use [:multibyte:] instead.
1317 ** The `diff' command uses the unified format now. To restore the old
1318 behavior, set `diff-switches' to `-c'.
1320 ** `grep-template' and `grep-find-template' values don't include the
1321 --color argument anymore. It's added at the <C> place holder position
1322 dynamically. Any third-party code that changes these templates should
1323 be updated accordingly.
1326 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1327 The new behavior is compatible with Common Lisp and with XEmacs.
1328 This change does not affect Lisp code intended to be portable to
1329 Emacs 24.2 and earlier, which did not support unary ‘/’.
1332 ** The `default-directory' value doesn't have to end slash. To make
1333 that happen, `unhandled-file-name-directory' now defaults to calling
1334 `file-name-as-directory'.
1337 * Lisp Changes in Emacs 25.1
1340 *** New UPatterns `quote', `app', `cl-struct', `eieio', `seq', and `map'.
1341 *** New UPatterns can be defined with `pcase-defmacro'.
1343 *** New vector QPattern.
1345 ** syntax-propertize is now automatically called on-demand during forward
1346 parsing functions like `forward-sexp'.
1348 ** New hooks prefix-command-echo-keystrokes-functions and
1349 prefix-command-preserve-state-hook, to allow the definition of prefix
1350 commands other than the predefined C-u.
1352 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1354 ** The default value of `load-read-function' is now `read'.
1356 ** New hook `pre-redisplay-functions', a bit easier to use than pre-redisplay-function.
1358 ** The second arg of `looking-back' should always be provided explicitly.
1360 ** Obsolete text properties `intangible', `point-entered', and `point-left'.
1361 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1362 implemented by the new `cursor-intangible-mode' and
1363 `cursor-sensor-mode' minor modes.
1365 ** New process type `pipe', which can be used in combination with the
1366 `:stderr' keyword of make-process to handle standard error output
1369 ** New function `make-process' provides an alternative interface to
1370 `start-process'. It allows programs to set process parameters such as
1371 process filter, sentinel, etc., through keyword arguments (similar to
1372 `make-network-process').
1375 ** A new function `directory-files-recursively' returns all matching
1376 files (recursively) under a directory.
1379 ** New variable `inhibit-message', when bound to non-nil, inhibits
1380 `message' and related functions from displaying messages in the echo
1381 area. The output is still logged to the *Messages* buffer.
1384 ** A new text property `inhibit-read-only' can be used in read-only
1385 buffers to allow certain parts of the text to be writable.
1388 ** A new variable `comment-end-can-be-escaped' is useful in languages
1389 such as C and C++ where line comments with escaped newlines are
1390 continued to the next line.
1393 ** New macro `define-advice'.
1395 ** `read-buffer' takes a new `predicate' argument.
1397 ** Emacs Lisp now supports generators.
1399 ** New finalizer facility for running code when objects
1402 ** lexical closures can use (:documentation <form>) to build their docstring.
1403 It should be placed right where the docstring would be, and <form> is then
1404 evaluated (and should return a string) when the closure is built.
1406 ** define-inline provides a new way to define inlinable functions.
1408 ** New function `macroexpand-1' to perform a single step of macroexpansion.
1410 ** Some "x-*" were obsoleted:
1411 *** x-select-text is renamed gui-select-text.
1412 *** x-selection-value is renamed gui-selection-value.
1413 *** x-get-selection is renamed gui-get-selection.
1414 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1415 *** x-get-selection-value is renamed to gui-get-primary-selection.
1416 *** x-set-selection is renamed to gui-set-selection
1418 ** New function `string-greaterp', which return the opposite result of
1422 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1423 preserve the collation order as defined by the system's locale(1)
1424 environment. For the time being this is implemented for modern POSIX
1425 systems and for MS-Windows, for other systems they fall back to their
1426 counterparts `string-lessp' and `string-equal'.
1429 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1430 If you want the old, locale-independent sorting, customize the new
1431 option `ls-lisp-use-string-collate' to a nil value.
1434 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1435 if set to a non-nil value, causes the above 2 functions to ignore
1436 symbol and punctuation characters when collating strings. This
1437 emulates the behavior of modern Posix platforms when the locale's
1438 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1439 MS-Windows doesn't support UTF-8 as codeset in its locales.
1441 ** New function `alist-get', which is also a valid place (aka lvalue).
1443 ** New function `funcall-interactively', which works like `funcall'
1444 but makes `called-interactively-p' treat the function as (you guessed it)
1445 called interactively.
1447 ** New function `function-put' to use instead of `put' for function properties.
1450 ** The new function `bidi-find-overridden-directionality' allows to
1451 find characters whose directionality was, perhaps maliciously,
1452 overridden by directional override control characters. Lisp programs
1453 can use this to detect potential phishing of URLs and other links that
1454 exploits bidirectional display reordering.
1457 ** The new function `buffer-substring-with-bidi-context' allows to
1458 copy a portion of a buffer into a different location while preserving
1459 the visual appearance both of the copied text and the text at
1460 destination, even when the copied text includes mixed bidirectional
1461 text and directional control characters.
1464 ** New properties that can be specified with `declare':
1465 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1466 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1467 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1471 ** New macro `with-file-modes', for evaluating expressions with default file
1472 permissions set to temporary values (e.g., for creating private files).
1474 ** You can access the slots of structures using `cl-struct-slot-value'.
1476 ** Function `sort' can deal with vectors.
1478 ** Function `system-name' now returns an updated value if the current
1479 system's name has changed or if the Emacs process has changed systems,
1480 and to avoid long waits it no longer consults DNS to canonicalize the
1481 name. The variable `system-name' is now obsolete.
1484 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1486 ** If `pwd' is called with a prefix argument, insert the current default
1490 ** New functions return extended information about fonts and faces.
1493 *** The function `font-info' now returns more details about a font.
1494 In particular, it now returns the average width of the font's
1495 characters, which can be used for geometry-related calculations.
1498 *** A new function `default-font-width' returns the average width of a
1499 character in the current buffer's default font. If the default face
1500 is remapped (see `face-remapping-alist'), the value for the remapped
1501 face is returned. This function complements the existing function
1502 `default-font-height'.
1505 *** New functions `window-font-height' and `window-font-width' return
1506 the height and average width of characters in a specified face and
1507 window. If FACE is remapped (see `face-remapping-alist'), the
1508 function returns the information for the remapped face.
1511 *** A new function `window-max-chars-per-line' returns the maximal
1512 number of characters that can be displayed on one line. If a face
1513 and/or window are provided, these values are used for the
1514 calculation. This function is different from `window-body-width' in
1515 that it accounts for (i) continuation glyphs, (ii) the size of the
1516 font, and (iii) the specified window.
1519 ** New utilities in subr-x.el:
1520 *** New macros `if-let' and `when-let' allow defining bindings and to
1521 execute code depending whether all values are true.
1522 *** New macros `thread-first' and `thread-last' allow threading a form
1523 as the first or last argument of subsequent forms.
1526 ** Documentation strings now support quoting with curved single quotes
1527 ‘like-this’ in addition to the old style with grave accent and
1528 apostrophe `like-this'. The new style looks better on today's displays.
1529 In the new Electric Quote mode, you can enter curved single quotes
1530 into documentation by typing ` and '. Outside Electric Quote mode,
1531 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1532 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1533 ‘text-quoting-style’, the user can specify how to display doc string
1537 ** New function ‘format-message’ is like ‘format’ and also converts
1538 curved single quotes, grave accents and apostrophes as per
1539 ‘text-quoting-style’.
1542 ** show-help-function's arg is converted via substitute-command-keys
1543 before being passed to the function. Help strings, help-echo
1544 properties, etc. can therefore contain command key escapes and
1548 ** Time-related changes:
1550 *** Time conversion functions now accept an optional ZONE argument
1551 that specifies the time zone rules for conversion. ZONE is omitted or
1552 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1553 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1554 rule. The affected functions are ‘current-time-string’,
1555 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1556 function ‘encode-time’, which already accepted a simple time zone rule
1557 argument, has been extended to accept all the new forms.
1559 *** Time-related functions now consistently accept numbers
1560 (representing seconds since the epoch) and nil (representing the
1561 current time) as well as the usual list-of-integer representation.
1562 Affected functions include `current-time-string', `current-time-zone',
1563 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1564 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1565 `time-to-days', and `time-to-seconds'.
1567 *** The `encode-time-value' and `with-decoded-time-value' macros have
1570 *** `calendar-next-time-zone-transition', `time-add', and
1571 `time-subtract' no longer return time values in the obsolete and
1572 undocumented integer-pair format. Instead, they return a list of two
1576 ** New function `set-binary-mode' allows to switch a standard stream
1577 of the Emacs process to binary I/O mode.
1580 ** The new function `directory-name-p' can be used to check whether a file
1581 name (as returned from, for instance, `file-name-all-completions') is
1582 a directory file name. It returns non-nil if the last character in
1583 the name is a directory separator character (forward slash on GNU and
1584 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1586 ** ASCII approximations to curved quotes are put in standard-display-table
1587 if the terminal cannot display curved quotes.
1589 ** Standard output and error streams now transliterate characters via
1590 standard-display-table, and encode output using locale-coding-system.
1593 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1596 ** New possible value for `system-type': `nacl'.
1597 This is used by Google's Native Client (NaCl).
1599 ** Miscellaneous name change
1601 For consistency with the usual Emacs spelling, the Lisp variable
1602 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1603 The old name should still work, as an obsolescent alias.
1605 ** Changes in Frame- and Window- Handling
1608 *** Emacs can now draw horizontal scroll bars on some platforms that
1609 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1610 Horizontal scroll bars are turned off by default.
1611 **** New function `horizontal-scroll-bars-available-p' telling whether
1612 horizontal scroll bars are available on the underlying system.
1613 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1614 bars on all existing and future frames.
1615 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1616 scroll bars on the selected frame.
1617 **** New frame parameters `horizontal-scroll-bars' and
1618 `scroll-bar-height' to set horizontal scroll bars and their height
1619 for individual frames and in `default-frame-alist'.
1620 **** New functions `frame-scroll-bar-height' and
1621 `window-scroll-bar-height' return the height of horizontal scroll
1622 bars on a specific frame or window.
1623 **** `set-window-scroll-bars' now accepts five parameters where the last
1624 two specify height and type of the window's horizontal scroll bar.
1625 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
1627 **** New buffer-local variables `horizontal-scroll-bar' and
1628 `scroll-bar-height'.
1631 *** New functions `frame-geometry' and `frame-edges' give access to a
1635 *** New functions `mouse-absolute-pixel-position' and
1636 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1640 *** The function `window-edges' now accepts three additional arguments to
1641 retrieve body, absolute and pixel edges of the window.
1644 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
1645 `window-inside-absolute-pixel-edges' have been renamed to respectively
1646 `window-body-edges', `window-body-pixel-edges' and
1647 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1650 *** New function `window-absolute-pixel-position' to get the screen
1651 coordinates of a visible buffer position.
1654 *** The height of a frame's menu and tool bar are no longer counted in the
1655 frame's text height. This means that the text height stands only for
1656 the height of the frame's root window plus that of the echo area (if
1657 present). This was already the behavior for frames with external tool
1658 and menu bars (like in the Gtk builds) but has now been extended to all
1662 *** Frames now do not necessarily preserve the number of columns or lines
1663 they display when setting default font, menu bar, fringe width, or
1664 scroll bars. In particular, maximized and fullscreen frames are
1665 conceptually never resized if such settings change. For fullheight and
1666 fullwidth frames, the behavior may depend on the toolkit used.
1667 **** New option `frame-inhibit-implied-resize' if non-nil, means that
1668 setting default font, menu bar, fringe width, or scroll bars of a
1669 specific frame does not resize that frame in order to preserve the
1670 number of columns or lines it displays.
1673 *** New function `window-preserve-size' allows to preserve the size of
1674 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1675 `temp-buffer-resize-mode' and `display-buffer'.
1678 *** New `display-buffer' action function `display-buffer-use-some-frame'.
1679 This displays the buffer in an existing frame other than the current
1680 frame, and allows the caller to specify a frame predicate to exclude
1684 *** New minor mode `window-divider-mode' and options
1685 `window-divider-default-places', `window-divider-default-bottom-width'
1686 and `window-divider-default-right-width'.
1688 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
1689 Those features have been deprecated in Gtk+ for a long time.
1693 *** etags no longer qualifies class members by default.
1695 By default, `etags' will not qualify class members for C-like
1696 object-oriented languages with their class names and namespaces, and
1697 will remove qualifications used explicitly in the code from the tag
1698 names it puts in TAGS files. This is so the etags.el back-end for
1699 `xref-find-definitions' is more accurate and produces less false
1702 Use --class-qualify (-Q) if you want the old default behavior of
1703 qualifying class members in C++, Java, and Objective C. Note that
1704 using -Q might make some class members become "unknown" to `M-.'
1705 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1706 qualified names by hand.
1708 *** New language Ruby
1710 Names of modules, classes, methods, and functions are tagged.
1711 Overloaded operators are also tagged.
1713 *** Improved support for Lua
1715 Etags now tags functions even if the "function" keyword follows some
1716 whitespace at line beginning.
1719 * Changes in Emacs 25.1 on Non-Free Operating Systems
1722 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1723 This includes the makefile.w32-in files in various subdirectories, and
1724 the support files. The file nt/configure.bat now just tells the user
1725 to use the procedure described in nt/INSTALL, by running the Posix
1726 `configure' script in the top-level directory.
1729 ** Building Emacs for MS-Windows requires at least Windows XP
1730 or Windows Server 2003. The built binaries still run on all versions
1731 of Windows starting with Windows 9X.
1734 ** Emacs running on MS-Windows now supports the daemon mode.
1736 ** The byte counts in etags-generated TAGS files are now the same on
1737 MS-Windows as they are on other platforms.
1740 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1741 Pass '--without-ns' to configure to create an X11 build, the old default.
1743 ** OS X 10.5 or older is no longer supported.
1745 ** OS X on PowerPC is no longer supported.
1748 ** New variable `ns-use-fullscreen-animation' controls animation for
1749 non-native NS fullscreen. The default is nil. Set to t to enable
1750 animation when entering and leaving fullscreen. For native OSX fullscreen
1754 ** The new function 'w32-application-type' returns the type of an
1755 MS-Windows application given the name of its executable program file.
1758 ----------------------------------------------------------------------
1759 This file is part of GNU Emacs.
1761 GNU Emacs is free software: you can redistribute it and/or modify
1762 it under the terms of the GNU General Public License as published by
1763 the Free Software Foundation, either version 3 of the License, or
1764 (at your option) any later version.
1766 GNU Emacs is distributed in the hope that it will be useful,
1767 but WITHOUT ANY WARRANTY; without even the implied warranty of
1768 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1769 GNU General Public License for more details.
1771 You should have received a copy of the GNU General Public License
1772 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1778 paragraph-separate: "[
\f]*$"