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 ** New make target `check-expensive' to run additional tests.
153 This includes all tests which run via "make check", plus additional
154 tests which take more time to perform.
157 * Startup Changes in Emacs 25.1
160 ** When Emacs is given a file as a command line argument and
161 `initial-buffer-choice' is non-nil, display both the file and
162 `initial-buffer-choice'. When Emacs is given more than one file and
163 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
164 and *Buffer List*. This makes Emacs convenient to use from the
165 command line when `initial-buffer-choice' is non-nil.
168 ** The value of ‘initial-scratch-message’ is now treated as a doc string
169 and can contain escape sequences for command keys, quotes, and the like.
172 * Changes in Emacs 25.1
174 ** Emacs can now load shared/dynamic libraries (modules).
175 A dynamic Emacs module is a shared library that provides additional
176 functionality for use in Emacs Lisp programs, just like a package
177 written in Emacs Lisp would. The functions `load', `require',
178 `load-file', etc. were extended to load such modules, as they do with
179 Emacs Lisp packages. The new variable `module-file-suffix' holds the
180 system-dependent value of the file-name extension (`.so' on Posix
181 hosts) of the module files.
183 A module should export a C-callable function named
184 `emacs_module_init', which Emacs will call as part of the call to
185 `load' or `require' which loads the module. It should also export a
186 symbol named `plugin_is_GPL_compatible' to indicate that its code is
187 released under the GPL or compatible license; Emacs will refuse to
188 load modules that don't export such a symbol.
190 If a module needs to call Emacs functions, it should do so through the
191 API defined and documented in the header file `emacs-module.h'. Note
192 that any module that provides Lisp-callable functions will have to use
193 Emacs functions such as `fset' and `funcall', in order to register its
194 functions with the Emacs Lisp interpreter.
196 Modules can create `user-ptr' Lisp objects that embed pointers to C
197 struct's defined by the module. This is useful for keeping around
198 complex data structures created by a module, to be passed back to the
199 module's functions. User-ptr objects can also have associated
200 "finalizers" -- functions to be run when the object is GC'ed; this is
201 useful for freeing any resources allocated for the underlying data
202 structure, such as memory, open file descriptors, etc. A new
203 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
206 Loadable modules in Emacs are an experimental feature, and subject to
207 change in future releases. For that reason, their support is disabled
208 by default, and must be enabled by using the `--with-modules' option
212 ** Any file of the form .dir-locals*.el is now considered a dir-local
213 file, and multiple such files can be used in the same directory. See
214 the variable `dir-locals-file' for more information.
217 ** Network security (TLS/SSL certificate validity and the like) is
218 added via the new Network Security Manager (NSM) and controlled via
219 the `network-security-level' variable.
222 ** International domain names (IDNA) are now encoded via the new
223 puny.el library, so that one can visit web sites like
224 "http://méxico.icom.museum".
226 ** If Emacs isn't built with TLS support, an external TLS-capable
227 program is used instead. This program used to be run in --insecure
228 mode by default, but has now changed to be secure instead, and will
229 fail if you try to connect to non-verifiable hosts. This is
230 controlled by the `tls-program' variable.
233 ** C-h l now also lists the commands that were run.
235 ** The new M-s M-w key binding uses eww to search the web for the
238 ** M-x suggests shorthands and ignores obsolete commands for completion.
239 ** x-select-enable-clipboard is renamed select-enable-clipboard.
240 x-select-enable-primary and renamed select-enable-primary.
241 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
242 name it), with the proviso that on some systems (e.g. Windows)
243 select-enable-primary is ineffective since the system doesn't
244 have the equivalent of a primary selection.
247 ** New option `switch-to-buffer-in-dedicated-window' allows to customize
248 how `switch-to-buffer' proceeds interactively when the selected window
249 is strongly dedicated to its buffer.
252 ** The option `even-window-heights' has been renamed to
253 `even-window-sizes' and now handles window widths as well.
256 ** terpri gets an optional arg ENSURE to conditionally output a newline.
259 ** `insert-register' now leaves point after the inserted text
260 when called interactively. A prefix argument toggles this behavior.
263 ** The new variable `term-file-aliases' replaces some files from lisp/term.
264 The function `tty-run-terminal-initialization' consults this variable
265 when deciding what terminal-specific initialization code to run.
268 ** New variable `system-configuration-features', listing some of the
269 main features that Emacs was compiled with. This is mainly intended
270 for use in Emacs bug reports.
273 ** A password is now hidden also when typed in batch mode. Another
274 hiding character but the default `.' can be used by let-binding the
275 variable `read-hide-char'.
278 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
281 * Editing Changes in Emacs 25.1
284 ** M-x suggests shorthands and ignores obsolete commands for completion.
289 *** Successive single-char deletions are collapsed in the undo-log just like
290 successive char insertions. Which commands invoke this behavior is
291 controlled by the new `undo-auto-amalgamate' function. See the node
292 "Undo" in the ELisp manual for more details.
295 *** The heuristic used to insert `undo-boundary' after each command
296 has changed, so that if a command causes changes in more than just the
297 current buffer, Emacs now calls `undo-boundary' in every buffer
298 affected by the command.
301 ** New command `comment-line' bound to `C-x C-;'.
303 ** New and improved facilities for inserting Unicode characters
306 *** Unicode names entered via C-x 8 RET now use substring completion by default.
309 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
310 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
313 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
314 as you type. See also the new variable ‘text-quoting-style’.
317 ** New minor mode global-eldoc-mode is enabled by default.
320 ** Emacs now supports "bracketed paste mode" when running on a terminal
321 that supports it. This facility allows Emacs to understand pasted
322 chunks of text as strings to be inserted, instead of interpreting each
323 character in the pasted text as actual user input. This results in a
324 paste experience similar to that under a window system, and significant
325 performance improvements when pasting large amounts of text.
328 ** Emacs now supports the latest version of the UBA.
329 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
330 was updated to support all the latest additions and changes introduced
331 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
332 This includes full support for directional isolates and the
333 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
337 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
340 ** New buffer-local `electric-pair-local-mode'.
343 ** New variable `fast-but-imprecise-scrolling' inhibits
344 fontification during full screen scrolling operations, giving less
345 hesitant operation during auto-repeat of C-v, M-v at the cost of
346 possible inaccuracies in the end position.
349 ** New documentation command `describe-symbol'.
350 Works for functions, variables, faces, etc. It is bound to `C-h o' by
354 ** New function `custom-prompt-customize-unsaved-options' checks for
355 unsaved customizations and prompts user to customize (if found). It
356 is intended for adding to 'kill-emacs-query-functions'.
359 * Changes in Specialized Modes and Packages in Emacs 25.1
364 *** New command `checkdoc-package-keywords' checks if the
365 current package keywords are recognized. Set the new option
366 `checkdoc-package-keywords-flag' to non-nil to make
367 `checkdoc-current-buffer' call this function automatically.
370 *** New function `checkdoc-file' checks for style errors.
371 It's meant for use together with `compile':
372 emacs -batch --eval "(checkdoc-file \"subr.el\")"
375 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
376 It raises an error if a bookmark of that name already exists,
377 unlike `bookmark-set' which silently updates an existing bookmark.
382 *** `imap-ssl-program' has been removed, and imap.el uses the internal
383 GnuTLS encryption functions if possible.
388 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
389 the ordering of object keys by default.
392 *** New commands `json-pretty-print-ordered' and
393 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
394 object keys sorted alphabetically.
397 ** Prog mode has some support for multi-mode indentation.
398 This allows better indentation support in modes that support multiple
399 programming languages in the same buffer, like literate programming
400 environments or ANTLR programs with embedded Python code.
402 A major mode can provide indentation context for a sub-mode through
403 the `prog-indentation-context' variable. To support this, modes that
404 provide indentation should use `prog-widen' instead of `widen' and
405 `prog-first-column' instead of a literal zero. See the node
406 "Mode-Specific Indent" in the ELisp manual for more details.
408 ** Prettify Symbols mode
411 *** Prettify Symbols mode supports custom composition predicates. By
412 overriding the default `prettify-symbols-compose-predicate', modes can
413 specify in which contexts a symbol may be displayed as some Unicode
414 character. `prettify-symbols-default-compose-p' is the default which
415 is suitable for most programming languages such as C or Lisp (but not
419 *** Symbols can be unprettified while point is inside them.
420 New variable `prettify-symbols-unprettify-at-point' configures this.
422 ** Enhanced xterm support
425 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
426 This variable tells Emacs which advanced capabilities are available in
427 the xterm terminal emulator used to display Emacs text-mode frames.
428 The default is to check each capability, and use it if available.
429 (This variable was introduced in Emacs 24.1, but was not announced in
433 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
434 in the surrounding GUI (using the OSC-52 escape sequence). This only works
435 if your xterm supports it and enables the `allowWindowOps' options (disabled
436 by default at least in Debian, for security reasons).
438 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
439 escape sequence) if your xterm has the feature enabled but for that you
440 additionally need to add `getSelection' to `xterm-extra-capabilities'.
443 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
446 ** The `save-place' variable is replaced by `save-place-mode'.
451 *** ERC can now hide message types by network or channel.
452 `erc-hide-list' will hide all messages of the specified type, while
453 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
454 specified message types for the respective specified targets.
456 *** New variable `erc-default-port-tls' used to connect to TLS IRC
462 *** `midnight-mode' is now a proper minor mode.
465 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
470 *** New "external" package status.
471 An external package is any installed package that's not built-in and
472 not from `package-user-dir', which usually means it's from an entry in
473 `package-directory-list'. They are treated much like built-in
474 packages, in that they cannot be deleted through the package menu and
475 are not considered for upgrades.
477 The effect is that a user can manually place a specific version of a
478 package inside `package-directory-list' and the package menu will
482 *** If a package is available on multiple archives and one has higher
483 priority (as per `package-archive-priorities') only that one is
484 listed. This can be configured with `package-menu-hide-low-priority'.
487 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
488 This includes the above-mentioned low-priority packages, as well as
489 available packages whose version is lower than the currently installed
490 version (which were previously impossible to display).
491 This allows users to downgrade a package if a lower version is
495 *** When filtering the package menu, keywords starting with "arc:" or
496 "status:" represent package archive or status, respectively, instead
500 *** Most functions which involve downloading information now take an
501 ASYNC argument. If it is non-nil, package.el performs the download(s)
505 *** New variable `package-menu-async' controls whether the
506 package-menu uses asynchronous downloads.
509 *** `package-install-from-buffer' and `package-install-file' work on directories.
510 This follows the same rules as installing from a .tar file, except the
511 -pkg file is optional.
514 *** Packages which are dependencies of other packages cannot be deleted.
515 The FORCE argument to `package-delete' overrides this.
518 *** New custom variable `package-selected-packages' tracks packages
519 which were installed by the user (as opposed to installed as
520 dependencies). This variable can also be manually customized.
523 *** New command `package-install-user-selected-packages' installs all
524 packages from `package-selected-packages' which are currently missing.
527 *** New command `package-autoremove' removes all packages which were
528 installed strictly as dependencies but are no longer needed.
533 When you invoke `shell' interactively, the *shell* buffer will now
534 display in a new window. However, you can customize this behavior via
535 the `display-buffer-alist' variable. For example, to get
536 the old behavior -- *shell* buffer displays in current window -- use
537 (add-to-list 'display-buffer-alist
538 '("^\\*shell\\*$" . (display-buffer-same-window))).
542 *** The `:protection' slot option is not obeyed any more.
544 *** The `newname' argument to constructors is optional&deprecated.
545 If you need your objects to be named, do it by inheriting from `eieio-named'.
547 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
549 *** The <class> variables are declared obsolete.
551 *** The <initarg> variables are declared obsolete.
552 *** defgeneric and defmethod are declared obsolete.
554 *** `constructor' is now an obsolete alias for `make-instance'.
559 *** New command `ido-bury-buffer-at-head' bound to C-S-b
560 Bury the buffer at the head of `ido-matches', analogous to how C-k
561 kills the buffer at head.
564 *** A prefix argument to `ido-restrict-to-matches' will reverse its
565 meaning, and the list is restricted to those elements that do not
566 match the current input.
571 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
572 The new commands `next-line-or-history-element' and
573 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
574 minibuffer, allow by-line movement through minibuffer history,
575 similarly to an ordinary buffer. Only when point moves over
576 the bottom/top of the minibuffer it goes to the next/previous history
577 element. `M-p' and `M-n' still move directly to previous/next history
580 ** Search and Replace
583 *** New user option `search-default-regexp-mode'
584 specifies the default mode for I-search.
587 *** `isearch' and `query-replace' can now perform character folding in matches.
588 Isearch does that by default, while `query-replace' will do that if
589 the new variable `replace-character-fold' is customized to a non-nil
590 value. This is analogous to case folding, but instead of disregarding
591 case variants, it disregards wider classes of distinctions between
592 similar characters. (Case folding is a special case of character
593 folding.) This means many characters in the search string will match
594 entire groups of characters instead of just themselves.
596 For instance, the " will match all variants of double quotes (like “
597 and ”), and the letter a will match all of its accented cousins, even
598 those composed of multiple characters, as well as many other symbols
602 *** New function `character-fold-to-regexp' can be used
603 by searching commands to produce a regexp matching anything that
604 character-folds into STRING.
607 *** The new M-s M-w key binding uses eww to search the web for the
608 text in the region. The search engine to use for this is specified by
609 the customizable variable `eww-search-prefix'.
612 *** Query-replace history is enhanced.
613 When query-replace reads the FROM string from the minibuffer, typing
614 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
615 and TO are the original text and its replacement, and SEP is an arrow
616 string defined by the new variable `query-replace-from-to-separator'.
617 To select a prior replacement, type `M-p' until the desired
618 replacement appears in the minibuffer, and then exit the minibuffer by
623 *** If `quick-calc' is called with a prefix argument, insert the
624 result of the calculation into the current buffer.
627 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
628 this you can tell Edebug not to stop at the start of the first
629 instrumented function.
634 *** New minor mode `global-eldoc-mode'
635 It is turned on by default, and affects `*scratch*' and other buffers
636 whose major mode supports Emacs Lisp.
639 *** `eldoc-documentation-function' now defaults to `ignore'
642 *** `describe-char-eldoc' displays information about character at point,
643 and can be used as a default value of `eldoc-documentation-function'. It is
644 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
645 ] [, ] [, etc.) while using mono-spaced font.
650 *** HTML can now be rendered using variable-width fonts.
653 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
654 whether to use variable-pitch fonts or not. The user can also
655 customize the `shr-use-fonts' variable.
658 *** A new command `C' (`eww-toggle-colors') can be used to toggle
659 whether to use the HTML-specified colors or not. The user can also
660 customize the `shr-use-colors' variable.
663 *** A new command `R' (`eww-readable') will try do identify the main
664 textual parts of a web page and display only that, leaving menus and
665 the like off the page.
668 *** You can now use several eww buffers in parallel by renaming eww
669 buffers you want to keep separate.
672 *** Partial state of the eww buffers (the URIs and the titles of the
673 pages visited) is now preserved in the desktop file.
676 *** `eww-after-render-hook' is now called after eww has rendered
677 the data in the buffer.
680 *** The `eww-reload' command now takes a prefix to not reload via
681 the net, but just use the local copy of the HTML.
684 *** The DOM shr and eww uses has been changed to the general Emacs
685 xml.el/libxml2 DOM, and a new package dom.el has been added to
686 interact with this DOM. See the Emacs Lisp manual for interface
690 *** `mailcap-mime-data' is now consulted when displaying PDF files.
693 *** The new `S' command will list all eww buffers, and allow managing
697 *** https pages with valid certificates have headers marked in green, while
698 invalid certificates are marked in red.
703 *** text/html messages that contain inline image parts will be
704 transformed into multipart/related messages before sending.
707 ** In Show Paren Mode, a parenthesis can be highlighted when point
708 stands inside it, and certain parens can be highlighted when point is
709 at BOL or EOL, or in whitespace there. To enable these, customize,
710 respectively, `show-paren-when-point-inside-paren' or
711 `show-paren-when-point-in-periphery'.
716 *** Strings after `:documentation' are highlighted as docstrings.
717 This enhances Lisp mode fontification to handle documentation of the
718 form `(:documentation "the doc string")' used in Common Lisp code for
719 CLOS class and slot documentation.
724 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
727 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
728 *** `string-rectangle' provides on-the-fly preview of the result.
731 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
732 These should be used in preference to `font-lock-fontify-buffer' when
736 ** Macro `minibuffer-with-setup-hook' can optionally append a function
737 to `minibuffer-setup-hook'.
739 If the first argument of the macro is of the form `(:append FUN)',
740 then FUN will be appended to `minibuffer-setup-hook', instead of
745 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
747 ** Calendar and diary
750 *** The default `diary-file' is now located in .emacs.d.
753 *** New commands to insert diary entries with Chinese dates:
754 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
755 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
758 *** The calendar can now list and mark diary entries with Chinese dates.
759 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
762 *** The option `calendar-mode-line-format' can now be nil,
763 which means to do nothing special with the mode line in calendars.
766 *** New option `calendar-weekend-days'.
767 The option customizes which day headers receive the
768 `calendar-weekend-header' face.
771 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
774 *** Many items obsolete since at least version 23.1 have been removed.
775 The majority were function/variable/face aliases, too numerous to list here.
778 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
779 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
781 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
783 **** Macro `calendar-for-loop'.
785 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
787 **** The nil and list forms of `diary-display-function'.
790 ** New ERT function `ert-summarize-tests-batch-and-exit'.
791 If the output of ERT tests in batch mode execution can be saved to a
792 log file, then it can be passed as an argument to the above function
793 to produce a neat summary.
796 ** New js.el option `js-indent-first-init'.
797 It was renamed from `js-indent-first-initialiser', to avoid issues
798 with American vs British spelling.
803 ** Info mode now displays symbol names in fixed-pitch font.
804 If you want to get the old behavior back, customize the `Info-quoted'
805 face to use the same definitions as the default face.
808 *** `Info-fontify-maximum-menu-size' can be t for no limit.
811 *** `info-display-manual' can now be given a prefix argument which (any
812 non-nil value) directs the command to limit the completion
813 alternatives to currently visited manuals.
816 ** ntlm.el has support for NTLM2.
821 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
822 to delete or undelete multiple messages.
825 *** Rmail can now render HTML mail messages if your Emacs was built with
826 libxml2 or if you have the Lynx browser installed. By default, Rmail
827 will display the HTML version of a mail message that has both HTML and
828 plain text parts, if display of HTML email is possible; customize the
829 `rmail-mime-prefer-html' option to `nil' if you don't want that.
832 *** In the commands that make summaries by subject, recipients, or senders,
833 you can no longer use commas to separate regular expressions.
836 ** SES now supports local printer functions; see `ses-define-local-printer'.
840 *** In sh-mode you can now use `sh-shell' as a file-local variable to
841 specify the type of shell in use (bash, csh, etc).
844 *** New value `always' for `sh-indent-after-continuation'.
845 This provides old-style ("dumb") indentation of continued lines.
846 See the doc string of `sh-indent-after-continuation' for details.
850 *** Fatal TLS errors are now silent by default.
855 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
856 When `url-handler-mode' is enabled, file operations for these
857 protocols as well as for "telnet" and "ftp" are passed to Tramp.
860 *** The URL package allows customizing the `url-user-agent' string.
861 The new `url-user-agent' variable can be customized to be a string or
865 *** The new interface variable `url-request-noninteractive' can be used
866 to specify that we're running in a noninteractive context, and that
867 we should not be queried about things like TLS certificate validity.
870 *** If URL is used with a https connection, the first callback argument
871 plist will contain a :peer element that has the output of
872 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
877 *** New connection method "afp", which allows to access Mac OS X
878 volumes via the Apple Filing Protocol.
881 *** New connection method "nc", which allows to access dumb busyboxes.
884 *** Method-specific parameters can be overwritten now with variable
885 `tramp-connection-properties'.
888 *** Handler for `file-notify-valid-p' for remote machines that support
889 filesystem notifications.
894 *** New user variable `sql-default-directory' enables remote
895 connections using Tramp.
898 *** New command `sql-send-line-and-next'.
899 This command, bound to `C-c C-n' by default, sends the current line to
900 the SQL process and advances to the next line, skipping whitespace and
904 *** Added support for Vertica SQL.
906 ** VC and related modes
909 *** Basic push support, via `vc-push', bound to `C-x v P'.
910 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
911 (undocumented) command vc-hg-push now behaves slightly differently.
914 *** The new command vc-region-history shows the log+diff of the active region.
917 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
918 This command is useful when you perform version control commands
919 outside Emacs (e.g., from the shell prompt), or if you switch the VC
920 back-end for the buffer's file, or remove it from version control.
923 *** New option `vc-annotate-background-mode' controls whether
924 the color range from `vc-annotate-color-map' is applied to the
925 background or to the foreground.
928 *** `compare-windows' now compares text with the most recently selected window
929 instead of the next window. If you want the previous behavior of
930 comparing with the next window, customize the new option
931 `compare-windows-get-window-function' to the value
932 `compare-windows-get-next-window'.
935 *** Two new faces `compare-windows-removed' and `compare-windows-added'
936 replace the face `compare-windows', which is now an obsolete alias for
937 `compare-windows-added'.
940 *** `log-edit-insert-changelog' converts "(tiny change)" to
941 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
945 ** VHDL mode now supports VHDL'08.
950 *** Decimal display mode uses "," groups, so it's more
951 fitting for use in money calculations
954 *** Factorial works with non-integer inputs.
959 *** Hide-IfDef mode now support full C/C++ expressions in macros,
960 macro argument expansion, interactive macro evaluation and automatic
961 scanning of #define'd symbols.
964 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
965 result of evaluating a macro.
968 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
969 all defined symbols in `hide-ifdef-env'.
972 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
973 file name patterns. Defaults to files whose extension is one of `.h',
974 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
977 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
978 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
979 (This could happen when an idempotent header file is visited again,
980 when its guard symbol is already defined.) Defaults to `t'.
983 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
984 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
985 looking for macro definitions. By default, no symbols are ignored.
990 *** New custom variable `tex-print-file-extension' to help users who
991 use PDF instead of DVI.
994 *** TeX mode now supports Prettify Symbols mode. When enabling
995 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
996 many other math macros are displayed using unicode characters.
999 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
1000 By default, 32 consecutive spaces or four consecutive TABs are
1001 considered to be too deep, but the new variable
1002 `whitespace-big-indent-regexp' can be customized to change that.
1005 ** New options in `tildify-mode'.
1006 New options `tildify-space-string', `tildify-pattern', and
1007 `tildify-foreach-region-function' variables make
1008 `tildify-string-alist', `tildify-pattern-alist', and
1009 `tildify-ignored-environments-alist' variables (as well as a few
1010 helper functions) obsolete.
1013 ** New package Xref replaces Etags's front-end and UI
1015 The new package Xref provides a generic framework and new commands to
1016 find and move to definitions of functions, macros, data structures
1017 etc., as well as go back to the location where you were before moving
1018 to a definition. It supersedes and obsoletes many Etags commands,
1019 while still using the etags.el code that reads the TAGS tables as one
1022 The command `xref-find-definitions' replaces `find-tag' and provides
1023 an interface to pick one definition among several.
1024 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
1025 `pop-tag-mark', but has a keybinding (`M-,'), unlike `pop-tag-mark'.
1027 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
1028 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
1029 `xref-find-apropos' replaces `find-tag-regexp'.
1031 As a result of this, the following commands are now obsolete:
1032 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
1033 `tags-apropos', and `tags-loop-continue'.
1038 `find-tag-marker-ring-length' is now an obsolete alias for
1039 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
1040 alias for a private variable. `xref-push-marker-stack' and
1041 `xref-pop-marker-stack' should be used instead to manipulate the stack
1042 of searches for definitions.
1045 *** `xref-find-definitions' and `describe-function' now display
1046 information about mode local overrides (defined by cedet/mode-local.el
1047 `define-overloadable-function' `define-mode-local-overrides').
1049 The framework's Lisp API is still experimental and can change in major,
1050 backward-incompatible ways.
1053 ** New package Project
1055 The new package Project provides generic infrastructure for dealing
1056 with projects. The main commands included in it are
1057 `project-find-file' and `project-find-regexp'.
1059 The Lisp API of this package is still experimental.
1062 EUDC's LDAP backend has been improved.
1065 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1068 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1069 subprocess instead of on the command line.
1072 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1073 need to configure this manually anymore.
1076 *** The LDAP configuration section of EUDC's manual has been
1079 There have also been customization changes.
1082 *** New custom variable `eudc-server-hotlist' to allow specifying
1083 multiple EUDC servers in init file.
1086 *** Custom variable `eudc-inline-query-format' defaults to completing
1087 on email and firstname instead of surname.
1090 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1091 to avoid interfering with the kill ring.
1094 *** Custom variable `eudc-inline-expansion-format' defaults to
1095 "Firstname Surname <mail-address>".
1098 *** Custom variable `eudc-options-file' defaults to
1099 "~/.emacs.d/eudc-options".
1102 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1103 allow overriding the regular expression that recognizes the ldapsearch
1104 command line's password prompt.
1107 EUDC's BBDB backend now supports BBDB 3.
1110 EUDC's PH backend (eudcb-ph.el) is obsolete.
1115 *** The new built-in command `clear' can scroll window contents out of sight.
1116 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1119 *** New buffer syntax '#<buffer-name>', which is equivalent to
1120 '#<buffer buffer-name>'. This shorthand makes interacting with
1121 buffers from eshell more convenient. Custom variable
1122 `eshell-buffer-shorthand', which has been broken for a while, has been
1126 *** By default, eshell "visual" program buffers (created by
1127 `eshell-visual-commands' and similar custom vars) are no longer killed
1128 when their processes die. This fixes issues with short-lived commands
1129 and makes visual programs more useful in general. For example, if
1130 "git log" is a visual command, it will always show the visual command
1131 buffer, even if the "git log" process dies. For the old behavior,
1132 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1137 *** Support for the Conkeror web browser.
1140 *** Support for several ancient browsers is now officially obsolete.
1143 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1144 be added to the archive.
1147 ** Autorevert: dired buffers are also auto-reverted via file
1148 notifications, if Emacs is compiled with file notification support.
1150 ** File Notifications
1153 *** The new event `stopped' signals, that a file notification watch is
1154 not active any longer.
1157 *** The new function `file-notify-valid-p' checks, whether a file
1158 notification descriptor still corresponds to an activate watch.
1163 *** The command `dired-do-compress' bound to `Z' now can compress
1164 directories and decompress zip files.
1167 *** New command `dired-do-compress-to' bound to `c' can be used to
1168 compress many marked files into a single named archive. The
1169 compression command is determined from the new
1170 `dired-compress-files-alist' variable.
1173 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1174 viewing HTML files and the like.
1176 ** Tabulated List Mode
1179 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1180 call `tabulated-list-init-header', in which case it will have no
1184 *** `tabulated-list-print' takes a second optional argument, update,
1185 which specifies an alternative printing method which is faster when
1186 few or no entries have changed.
1188 ** Obsolete packages
1194 *** landmark.el (moved to elpa.gnu.org)
1197 * New Modes and Packages in Emacs 25.1
1200 ** pinentry.el allows GnuPG passphrase to be prompted through the
1201 minibuffer instead of a graphical dialog, depending on whether the gpg
1202 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1203 is set). This feature requires newer versions of GnuPG (2.1.5 or
1204 later) and Pinentry (0.9.5 or later).
1206 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1209 ** scss-mode (a minor variant of css-mode)
1212 ** let-alist is a new macro (and a package) that allows one to easily
1213 let-bind the values stored in an alist.
1216 ** `tildify-mode' allows to automatically insert hard spaces as one
1217 types the text. Breaking line after a single-character words is
1218 forbidden by Czech and Polish typography (and may be discouraged in
1219 other languages), so `auto-tildify-mode' makes it easier to create
1220 a typographically-correct documents.
1223 ** The `seq' library adds sequence manipulation functions and macros
1224 that complement basic functions provided by subr.el. All functions
1225 are prefixed with `seq-' and work on lists, strings and vectors.
1228 ** The `map' library provides map-manipulation functions that work on
1229 alists, hash-table and arrays. All functions are prefixed with
1233 ** The `thunk' library provides functions and macros to control the
1234 evaluation of forms.
1237 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1238 support for JSX, an XML-like syntax extension to ECMAScript.
1241 * Incompatible Lisp Changes in Emacs 25.1
1244 ** `setq' and `setf' must now be called with an even number of
1245 arguments. The earlier behavior of silently supplying a nil to the
1246 last variable when there was an odd number of arguments has been
1250 ** `syntax-begin-function' is declared obsolete.
1251 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1252 slot in font-lock-defaults.
1255 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1256 called during startup. Users who call this function in their init
1257 file and still expect it to be run after startup should set
1258 `package-enable-at-startup' to t after the call to
1259 `package-initialize'.
1262 ** `:global' minor mode use `setq-default' rather than `setq'.
1263 This means that you can't use `make-local-variable' and expect them to
1264 "magically" become buffer-local.
1267 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1268 The `track-mouse' form no longer refrains from changing the shape of
1269 the mouse pointer for the entire time the body of that form is
1270 executed. Lisp programs that use `track-mouse' for dragging across
1271 large portions of the Emacs display, and want to avoid changes in the
1272 pointer shape during dragging, should bind the variable `track-mouse'
1273 to the special value `dragging' in the body of the form.
1276 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1277 has any effect. (This change was made in Emacs 24.4 but was not
1278 advertised at the time.)
1281 ** `indirect-function' does not signal `void-function' any more.
1282 This is mostly a bug-fix, since this change was missed back in 24.4 when
1283 symbol-function was changed not to signal `void-function' any more.
1286 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1288 ** Comint, term, and compile do not set the EMACS env var any more.
1289 Use the INSIDE_EMACS environment variable instead.
1291 ** `save-excursion' does not save&restore the mark any more.
1293 ** read-buffer-function can now be called with a 4th argument (`predicate').
1295 ** completion-table-dynamic stays in the minibuffer.
1296 If you want the old behavior of calling the function in the buffer
1297 from which the minibuffer was entered, call it with the new argument
1300 ** window-configurations no longer record the buffers' marks.
1302 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1303 active region handling.
1305 ** deactivate-mark is now buffer-local.
1307 ** `cl-the' now asserts that its argument is of the given type.
1309 ** `process-running-child-p` may now return a numeric process
1310 group ID instead of `t'.
1313 ** Mouse click events on mode line or header line no longer include
1314 any reference to a buffer position. The 6th member of the mouse
1315 position list returned for such events is now nil.
1318 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1319 These slots used to hold key-shortcut data, but have been obsolete since
1323 ** Emacs no longer downcases the first letter of a system diagnostic
1324 when signaling a file error. For example, it now reports "Permission
1325 denied" instead of "permission denied". The old behavior was problematic
1326 in languages like German where downcasing rules depend on grammar.
1329 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1330 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1331 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1332 and apostrophe `like this'. The default value nil acts like ‘curve’
1333 if curved single quotes are displayable, and like ‘grave’ otherwise.
1334 The new variable affects display of diagnostics and help, but not of info.
1337 ** substitute-command-keys now replaces quotes.
1338 That is, it converts documentation strings’ quoting style as per the
1339 value of ‘text-quoting-style’. Doc strings in source code can use
1340 either curved single quotes or grave accents and apostrophes. As
1341 before, characters preceded by \= are output as-is.
1344 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1345 They use the new ‘format-message’ function instead of plain ‘format’,
1346 so that they now follow user preference as per ‘text-quoting-style’
1347 when processing curved single quotes, grave accents, and apostrophes
1348 in their format argument.
1351 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1352 now match multibyte characters using Unicode character properties.
1353 If you want the old behavior where they matched any character with
1354 word syntax, use `\sw' instead.
1357 ** The character classes [:graph:] and [:print:] in regular expressions
1358 no longer match every multibyte character. Instead, Emacs now
1359 consults the Unicode character properties to determine which
1360 characters are graphic or printable. In particular, surrogates and
1361 unassigned codepoints are now rejected. If you want the old behavior,
1362 use [:multibyte:] instead.
1365 ** The `diff' command uses the unified format now. To restore the old
1366 behavior, set `diff-switches' to `-c'.
1369 ** `grep-template' and `grep-find-template' values don't include the
1370 --color argument anymore. It's added at the <C> place holder position
1371 dynamically. Any third-party code that changes these templates should
1372 be updated accordingly.
1375 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1376 The new behavior is compatible with Common Lisp and with XEmacs.
1377 This change does not affect Lisp code intended to be portable to
1378 Emacs 24.2 and earlier, which did not support unary ‘/’.
1381 ** The `default-directory' value doesn't have to end slash. To make
1382 that happen, `unhandled-file-name-directory' now defaults to calling
1383 `file-name-as-directory'.
1386 * Lisp Changes in Emacs 25.1
1389 *** New UPatterns `quote', `app', `cl-struct', `eieio', `seq', and `map'.
1390 *** New UPatterns can be defined with `pcase-defmacro'.
1392 *** New vector QPattern.
1395 ** syntax-propertize is now automatically called on-demand during forward
1396 parsing functions like `forward-sexp'.
1398 ** New hooks prefix-command-echo-keystrokes-functions and
1399 prefix-command-preserve-state-hook, to allow the definition of prefix
1400 commands other than the predefined C-u.
1402 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1404 ** The default value of `load-read-function' is now `read'.
1406 ** New hook `pre-redisplay-functions', a bit easier to use than pre-redisplay-function.
1408 ** The second arg of `looking-back' should always be provided explicitly.
1410 ** Obsolete text properties `intangible', `point-entered', and `point-left'.
1411 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1412 implemented by the new `cursor-intangible-mode' and
1413 `cursor-sensor-mode' minor modes.
1415 ** `inhibit-point-motion-hooks' now defaults to t and is obsolete.
1418 ** New process type `pipe', which can be used in combination with the
1419 `:stderr' keyword of make-process to handle standard error output
1423 ** New function `make-process' provides an alternative interface to
1424 `start-process'. It allows programs to set process parameters such as
1425 process filter, sentinel, etc., through keyword arguments (similar to
1426 `make-network-process').
1429 ** A new function `directory-files-recursively' returns all matching
1430 files (recursively) under a directory.
1433 ** New variable `inhibit-message', when bound to non-nil, inhibits
1434 `message' and related functions from displaying messages in the echo
1435 area. The output is still logged to the *Messages* buffer.
1438 ** A new text property `inhibit-read-only' can be used in read-only
1439 buffers to allow certain parts of the text to be writable.
1442 ** A new variable `comment-end-can-be-escaped' is useful in languages
1443 such as C and C++ where line comments with escaped newlines are
1444 continued to the next line.
1447 ** New macro `define-advice'.
1449 ** `read-buffer' takes a new `predicate' argument.
1452 ** Emacs Lisp now supports generators.
1453 See the "Generators" section of the ELisp manual for the details.
1456 ** New finalizer facility for running code when objects become unreachable.
1457 See the "Finalizer Type" subsection in the ELisp manual for the
1460 ** lexical closures can use (:documentation FORM) to build their docstring.
1461 It should be placed right where the docstring would be, and FORM is then
1462 evaluated (and should return a string) when the closure is built.
1464 ** define-inline provides a new way to define inlinable functions.
1466 ** New function `macroexpand-1' to perform a single step of macroexpansion.
1468 ** Some "x-*" were obsoleted:
1469 *** x-select-text is renamed gui-select-text.
1470 *** x-selection-value is renamed gui-selection-value.
1471 *** x-get-selection is renamed gui-get-selection.
1472 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1473 *** x-get-selection-value is renamed to gui-get-primary-selection.
1474 *** x-set-selection is renamed to gui-set-selection
1476 ** New function `string-greaterp', which return the opposite result of
1480 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1481 preserve the collation order as defined by the system's locale(1)
1482 environment. For the time being this is implemented for modern POSIX
1483 systems and for MS-Windows, for other systems they fall back to their
1484 counterparts `string-lessp' and `string-equal'.
1487 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1488 If you want the old, locale-independent sorting, customize the new
1489 option `ls-lisp-use-string-collate' to a nil value.
1492 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1493 if set to a non-nil value, causes the above 2 functions to ignore
1494 symbol and punctuation characters when collating strings. This
1495 emulates the behavior of modern Posix platforms when the locale's
1496 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1497 MS-Windows doesn't support UTF-8 as codeset in its locales.
1499 ** New function `alist-get', which is also a valid place (aka lvalue).
1501 ** New function `funcall-interactively', which works like `funcall'
1502 but makes `called-interactively-p' treat the function as (you guessed it)
1503 called interactively.
1505 ** New function `function-put' to use instead of `put' for function properties.
1508 ** The new function `bidi-find-overridden-directionality' allows to
1509 find characters whose directionality was, perhaps maliciously,
1510 overridden by directional override control characters. Lisp programs
1511 can use this to detect potential phishing of URLs and other links that
1512 exploits bidirectional display reordering.
1515 ** The new function `buffer-substring-with-bidi-context' allows to
1516 copy a portion of a buffer into a different location while preserving
1517 the visual appearance both of the copied text and the text at
1518 destination, even when the copied text includes mixed bidirectional
1519 text and directional control characters.
1522 ** New properties that can be specified with `declare':
1523 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1524 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1525 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1529 ** New macro `with-file-modes', for evaluating expressions with default file
1530 permissions set to temporary values (e.g., for creating private files).
1533 ** You can access the slots of structures using `cl-struct-slot-value'.
1535 ** Function `sort' can deal with vectors.
1537 ** Function `system-name' now returns an updated value if the current
1538 system's name has changed or if the Emacs process has changed systems,
1539 and to avoid long waits it no longer consults DNS to canonicalize the
1540 name. The variable `system-name' is now obsolete.
1543 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1546 ** If `pwd' is called with a prefix argument, insert the current default
1550 ** New functions return extended information about fonts and faces.
1553 *** The function `font-info' now returns more details about a font.
1554 In particular, it now returns the average width of the font's
1555 characters, which can be used for geometry-related calculations.
1558 *** A new function `default-font-width' returns the average width of a
1559 character in the current buffer's default font. If the default face
1560 is remapped (see `face-remapping-alist'), the value for the remapped
1561 face is returned. This function complements the existing function
1562 `default-font-height'.
1565 *** New functions `window-font-height' and `window-font-width' return
1566 the height and average width of characters in a specified face and
1567 window. If FACE is remapped (see `face-remapping-alist'), the
1568 function returns the information for the remapped face.
1571 *** A new function `window-max-chars-per-line' returns the maximal
1572 number of characters that can be displayed on one line. If a face
1573 and/or window are provided, these values are used for the
1574 calculation. This function is different from `window-body-width' in
1575 that it accounts for (i) continuation glyphs, (ii) the size of the
1576 font, and (iii) the specified window.
1579 ** New utilities in subr-x.el:
1580 *** New macros `if-let' and `when-let' allow defining bindings and to
1581 execute code depending whether all values are true.
1582 *** New macros `thread-first' and `thread-last' allow threading a form
1583 as the first or last argument of subsequent forms.
1586 ** Documentation strings now support quoting with curved single quotes
1587 ‘like-this’ in addition to the old style with grave accent and
1588 apostrophe `like-this'. The new style looks better on today's displays.
1589 In the new Electric Quote mode, you can enter curved single quotes
1590 into documentation by typing ` and '. Outside Electric Quote mode,
1591 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1592 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1593 ‘text-quoting-style’, the user can specify how to display doc string
1597 ** New function ‘format-message’ is like ‘format’ and also converts
1598 curved single quotes, grave accents and apostrophes as per
1599 ‘text-quoting-style’.
1602 ** show-help-function's arg is converted via substitute-command-keys
1603 before being passed to the function. Help strings, help-echo
1604 properties, etc. can therefore contain command key escapes and
1608 ** Time-related changes:
1610 *** Time conversion functions now accept an optional ZONE argument
1611 that specifies the time zone rules for conversion. ZONE is omitted or
1612 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1613 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1614 rule. The affected functions are ‘current-time-string’,
1615 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1616 function ‘encode-time’, which already accepted a simple time zone rule
1617 argument, has been extended to accept all the new forms.
1619 *** Time-related functions now consistently accept numbers
1620 (representing seconds since the epoch) and nil (representing the
1621 current time) as well as the usual list-of-integer representation.
1622 Affected functions include `current-time-string', `current-time-zone',
1623 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1624 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1625 `time-to-days', and `time-to-seconds'.
1627 *** The `encode-time-value' and `with-decoded-time-value' macros have
1630 *** `calendar-next-time-zone-transition', `time-add', and
1631 `time-subtract' no longer return time values in the obsolete and
1632 undocumented integer-pair format. Instead, they return a list of two
1636 ** New function `set-binary-mode' allows to switch a standard stream
1637 of the Emacs process to binary I/O mode.
1640 ** The new function `directory-name-p' can be used to check whether a file
1641 name (as returned from, for instance, `file-name-all-completions') is
1642 a directory file name. It returns non-nil if the last character in
1643 the name is a directory separator character (forward slash on GNU and
1644 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1647 ** ASCII approximations to curved quotes are put in standard-display-table
1648 if the terminal cannot display curved quotes.
1651 ** Standard output and error streams now transliterate characters via
1652 standard-display-table, and encode output using locale-coding-system.
1653 To force a specific encoding, bind `coding-system-for-write' to the
1654 coding-system of your choice when invoking functions like `prin1' and
1658 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1661 ** New possible value for `system-type': `nacl'.
1662 This is used by Google's Native Client (NaCl).
1664 ** Miscellaneous name change
1667 For consistency with the usual Emacs spelling, the Lisp variable
1668 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1669 The old name should still work, as an obsolescent alias.
1671 ** Changes in Frame- and Window- Handling
1674 *** Emacs can now draw horizontal scroll bars on some platforms that
1675 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1676 Horizontal scroll bars are turned off by default.
1678 **** New function `horizontal-scroll-bars-available-p' telling whether
1679 horizontal scroll bars are available on the underlying system.
1681 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1682 bars on all existing and future frames.
1684 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1685 scroll bars on the selected frame.
1687 **** New frame parameters `horizontal-scroll-bars' and
1688 `scroll-bar-height' to set horizontal scroll bars and their height
1689 for individual frames and in `default-frame-alist'.
1691 **** New functions `frame-scroll-bar-height' and
1692 `window-scroll-bar-height' return the height of horizontal scroll
1693 bars on a specific frame or window.
1695 **** `set-window-scroll-bars' now accepts five parameters where the last
1696 two specify height and type of the window's horizontal scroll bar.
1698 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
1701 **** New buffer-local variables `horizontal-scroll-bar' and
1702 `scroll-bar-height'.
1705 *** New functions `frame-geometry' and `frame-edges' give access to a
1709 *** New functions `mouse-absolute-pixel-position' and
1710 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1714 *** The function `window-edges' now accepts three additional arguments to
1715 retrieve body, absolute and pixel edges of the window.
1718 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
1719 `window-inside-absolute-pixel-edges' have been renamed to respectively
1720 `window-body-edges', `window-body-pixel-edges' and
1721 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1724 *** New function `window-absolute-pixel-position' to get the screen
1725 coordinates of a visible buffer position.
1728 *** The height of a frame's menu and tool bar are no longer counted in the
1729 frame's text height. This means that the text height stands only for
1730 the height of the frame's root window plus that of the echo area (if
1731 present). This was already the behavior for frames with external tool
1732 and menu bars (like in the Gtk builds) but has now been extended to all
1736 *** Frames now do not necessarily preserve the number of columns or lines
1737 they display when setting default font, menu bar, fringe width, or
1738 scroll bars. In particular, maximized and fullscreen frames are
1739 conceptually never resized if such settings change. For fullheight and
1740 fullwidth frames, the behavior may depend on the toolkit used.
1741 **** New option `frame-inhibit-implied-resize' if non-nil, means that
1742 setting default font, menu bar, fringe width, or scroll bars of a
1743 specific frame does not resize that frame in order to preserve the
1744 number of columns or lines it displays.
1747 *** New function `window-preserve-size' allows to preserve the size of
1748 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1749 `temp-buffer-resize-mode' and `display-buffer'.
1752 *** New `display-buffer' action function `display-buffer-use-some-frame'.
1753 This displays the buffer in an existing frame other than the current
1754 frame, and allows the caller to specify a frame predicate to exclude
1758 *** New minor mode `window-divider-mode' and options
1759 `window-divider-default-places', `window-divider-default-bottom-width'
1760 and `window-divider-default-right-width'.
1762 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
1763 Those features have been deprecated in Gtk+ for a long time.
1768 *** etags no longer qualifies class members by default.
1770 By default, `etags' will not qualify class members for C-like
1771 object-oriented languages with their class names and namespaces, and
1772 will remove qualifications used explicitly in the code from the tag
1773 names it puts in TAGS files. This is so the etags.el back-end for
1774 `xref-find-definitions' is more accurate and produces less false
1777 Use --class-qualify (-Q) if you want the old default behavior of
1778 qualifying class members in C++, Java, and Objective C. Note that
1779 using -Q might make some class members become "unknown" to `M-.'
1780 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1781 qualified names by hand.
1784 *** New language Ruby
1786 Names of modules, classes, methods, and functions are tagged.
1787 Overloaded operators are also tagged.
1790 *** Improved support for Lua
1792 Etags now tags functions even if the "function" keyword follows some
1793 whitespace at line beginning.
1796 * Changes in Emacs 25.1 on Non-Free Operating Systems
1799 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1800 This includes the makefile.w32-in files in various subdirectories, and
1801 the support files. The file nt/configure.bat now just tells the user
1802 to use the procedure described in nt/INSTALL, by running the Posix
1803 `configure' script in the top-level directory.
1806 ** Building Emacs for MS-Windows requires at least Windows XP
1807 or Windows Server 2003. The built binaries still run on all versions
1808 of Windows starting with Windows 9X.
1811 ** Emacs running on MS-Windows now supports the daemon mode.
1814 ** The byte counts in etags-generated TAGS files are now the same on
1815 MS-Windows as they are on other platforms.
1818 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1819 Pass '--without-ns' to configure to create an X11 build, the old default.
1822 ** OS X 10.5 or older is no longer supported.
1825 ** OS X on PowerPC is no longer supported.
1828 ** New variable `ns-use-fullscreen-animation' controls animation for
1829 non-native NS fullscreen. The default is nil. Set to t to enable
1830 animation when entering and leaving fullscreen. For native OSX fullscreen
1834 ** The new function 'w32-application-type' returns the type of an
1835 MS-Windows application given the name of its executable program file.
1838 ----------------------------------------------------------------------
1839 This file is part of GNU Emacs.
1841 GNU Emacs is free software: you can redistribute it and/or modify
1842 it under the terms of the GNU General Public License as published by
1843 the Free Software Foundation, either version 3 of the License, or
1844 (at your option) any later version.
1846 GNU Emacs is distributed in the hope that it will be useful,
1847 but WITHOUT ANY WARRANTY; without even the implied warranty of
1848 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1849 GNU General Public License for more details.
1851 You should have received a copy of the GNU General Public License
1852 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1858 paragraph-separate: "[
\f]*$"