1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2014-2015 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 If possible, use M-x report-emacs-bug.
9 This file is about changes in Emacs version 25.
11 See file HISTORY for a list of GNU Emacs versions and release dates.
12 See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
13 and NEWS.1-17 for changes in older Emacs versions.
15 You can narrow news to a specific version by calling `view-emacs-news'
16 with a prefix argument or by typing C-u C-h C-n.
19 +++ indicates that all necessary documentation updates are complete.
20 (This means all relevant manuals in doc/ AND lisp doc-strings.)
21 --- means no change in the manuals is needed.
22 When you add a new item, use the appropriate mark if you are sure it applies,
23 otherwise leave it unmarked.
26 * Installation Changes in Emacs 25.2
28 ** 'configure' detects the kqueue file notification library on *BSD
29 and Mac OS X machines.
32 * Changes in Emacs 25.2
34 ** It is possible to disable attempted recovery on fatal signals
36 Two new variables allow to disable attempts to recover from stack
37 overflow and to avoid automatic auto-save when Emacs is delivered a
38 fatal signal. `attempt-stack-overflow-recovery', if set to `nil',
39 will disable attempts to recover from C stack overflows; Emacs will
40 then crash as with any other fatal signal.
41 `attempt-orderly-shutdown-on-fatal-signal', if set to `nil', will
42 disable attempts to auto-save the session and shut down in an orderly
43 fashion when Emacs receives a fatal signal; instead, Emacs will
44 terminate immediately. Both variables are non-`nil' by default.
45 These variables are for users who would like to avoid the small
46 probability of data corruption due to techniques Emacs uses to recover
50 * Changes in Specialized Modes and Packages in Emacs 25.2
54 *** The kqueue library is integrated for *BSD and Mac OS X machines.
57 * Installation Changes in Emacs 25.1
60 ** Building Emacs now requires C99 or later.
63 ** Building Emacs now requires GNU make, version 3.81 or later.
66 ** New configure option --with-cairo.
67 This builds Emacs with Cairo drawing. As a side effect, it provides
68 support for built-in printing, when Emacs was built with GTK+.
70 ** New configure option --with-modules.
71 This enables support for loading dynamic modules; see below.
74 ** By default, Emacs no longer works on IRIX. We expect that Emacs
75 users are not affected by this, as SGI stopped supporting IRIX in
76 December 2013. If you are affected, please send a bug report. You
77 should be able to work around the problem either by porting the Emacs
78 undumping code to GCC under IRIX, or by configuring --with-wide-int,
79 or by sticking with Emacs 24.4.
82 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
83 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
84 since Emacs 24.4, and the other variants were undocumented and were
85 obstacles to maintenance and development. GC_MARK_STACK and its
86 related symbols have been removed from the C internals.
89 ** 'configure' now prefers gnustep-config when configuring GNUstep.
90 If gnustep-config is not available, the old heuristics are used.
93 ** 'configure' now prefers inotify to gfile for file notification,
94 unless gfile is explicitly requested via --with-file-notification='gfile'.
97 ** The configure option '--with-pkg-config-prog' has been removed.
98 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
101 ** The configure option '--with-mmdf' has been removed.
102 It was no longer useful, as it relied on libraries that are no longer
103 supported, and its presence led to confusion during configuration.
104 This affects only the 'movemail' utility; Emacs itself can still
105 process MMDF-format files as before.
108 ** The configure option '--enable-silent-rules' is now the default,
109 and silent rules are now quieter. To get the old behavior where
110 'make' chatters a lot, configure with '--disable-silent-rules' or
111 build with 'make V=1'.
114 ** The configure option '--with-gameuser' now allows to specify a
115 group instead of a user if its argument is prefixed by ':' (a colon).
116 This will cause the game score files in ${localstatedir}/games/emacs
117 to be owned by that group, and the helper program for updating them to
118 be installed setgid. The option now defaults to the 'games' group.
121 ** The `grep-changelog' script (and its manual page) are no longer included.
122 It has no particular connection to Emacs and has not changed in years,
123 so if you want to use it, you can always take a copy from an older Emacs.
126 ** Emacs 25 comes with a new set of icons.
127 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
128 The old Emacs logo icons are available as `emacs23.png' in the same location.
131 * Startup Changes in Emacs 25.1
134 ** When Emacs is given a file as a command line argument and
135 `initial-buffer-choice' is non-nil, display both the file and
136 `initial-buffer-choice'. When Emacs is given more than one file and
137 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
138 and *Buffer List*. This makes Emacs convenient to use from the
139 command line when `initial-buffer-choice' is non-nil.
142 ** The value of ‘initial-scratch-message’ is now treated as a doc string
143 and can contain escape sequences for command keys, quotes, and the like.
146 * Changes in Emacs 25.1
148 ** Emacs can now load shared/dynamic libraries (modules).
149 A dynamic Emacs module is a shared library that provides additional
150 functionality for use in Emacs Lisp programs, just like a package
151 written in Emacs Lisp would. The functions `load', `require',
152 `load-file', etc. were extended to load such modules, as they do with
153 Emacs Lisp packages. The new variable `module-file-suffix' holds the
154 system-dependent value of the file-name extension (`.so' on Posix
155 hosts) of the module files.
157 A module should export a C-callable function named
158 `emacs_module_init', which Emacs will call as part of the call to
159 `load' or `require' which loads the module. It should also export a
160 symbol named `plugin_is_GPL_compatible' to indicate that its code is
161 released under the GPL or compatible license; Emacs will refuse to
162 load modules that don't export such a symbol.
164 If a module needs to call Emacs functions, it should do so through the
165 API defined and documented in the header file `emacs-module.h'. Note
166 that any module that provides Lisp-callable functions will have to use
167 Emacs functions such as `fset' and `funcall', in order to register its
168 functions with the Emacs Lisp interpreter.
170 Modules can create `user-ptr' Lisp objects that embed pointers to C
171 struct's defined by the module. This is useful for keeping around
172 complex data structures created by a module, to be passed back to the
173 module's functions. User-ptr objects can also have associated
174 "finalizers" -- functions to be run when the object is GC'ed; this is
175 useful for freeing any resources allocated for the underlying data
176 structure, such as memory, open file descriptors, etc. A new
177 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
180 Loadable modules in Emacs are an experimental feature, and subject to
181 change in future releases. For that reason, their support is disabled
182 by default, and must be enabled by using the `--with-modules' option
186 ** Any file of the form .dir-locals*.el is now considered a dir-local
187 file, and multiple such files can be used in the same directory. See
188 the variable `dir-locals-file' for more information.
191 ** Network security (TLS/SSL certificate validity and the like) is
192 added via the new Network Security Manager (NSM) and controlled via
193 the `network-security-level' variable.
196 ** International domain names (IDNA) are now encoded via the new
197 puny.el library, so that one can visit web sites like
198 "http://méxico.icom.museum".
200 ** If Emacs isn't built with TLS support, an external TLS-capable
201 program is used instead. This program used to be run in --insecure
202 mode by default, but has now changed to be secure instead, and will
203 fail if you try to connect to non-verifiable hosts. This is
204 controlled by the `tls-program' variable.
207 ** C-h l now also lists the commands that were run.
209 ** The new M-s M-w key binding uses eww to search the web for the
212 ** M-x suggests shorthands and ignores obsolete commands for completion.
213 ** x-select-enable-clipboard is renamed select-enable-clipboard.
214 x-select-enable-primary and renamed select-enable-primary.
215 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
216 name it), with the proviso that on some systems (e.g. Windows)
217 select-enable-primary is ineffective since the system doesn't
218 have the equivalent of a primary selection.
221 ** New option `switch-to-buffer-in-dedicated-window' allows to customize
222 how `switch-to-buffer' proceeds interactively when the selected window
223 is strongly dedicated to its buffer.
226 ** The option `even-window-heights' has been renamed to
227 `even-window-sizes' and now handles window widths as well.
230 ** terpri gets an optional arg ENSURE to conditionally output a newline.
233 ** `insert-register' now leaves point after the inserted text
234 when called interactively. A prefix argument toggles this behavior.
237 ** The new variable `term-file-aliases' replaces some files from lisp/term.
238 The function `tty-run-terminal-initialization' consults this variable
239 when deciding what terminal-specific initialization code to run.
242 ** New variable `system-configuration-features', listing some of the
243 main features that Emacs was compiled with. This is mainly intended
244 for use in Emacs bug reports.
247 ** A password is now hidden also when typed in batch mode. Another
248 hiding character but the default `.' can be used by let-binding the
249 variable `read-hide-char'.
252 ** New input method: `tamil-dvorak'.
255 * Editing Changes in Emacs 25.1
258 ** M-x suggests shorthands and ignores obsolete commands for completion.
263 *** Successive single-char deletions are collapsed in the undo-log just like
264 successive char insertions. Which commands invoke this behavior is
265 controlled by the new `undo-auto-amalgamate' function. See the node
266 "Undo" in the ELisp manual for more details.
269 *** The heuristic used to insert `undo-boundary' after each command
270 has changed, so that if a command causes changes in more than just the
271 current buffer, Emacs now calls `undo-boundary' in every buffer
272 affected by the command.
275 ** New command `comment-line' bound to `C-x C-;'.
277 ** New and improved facilities for inserting Unicode characters
280 *** Unicode names entered via C-x 8 RET now use substring completion by default.
283 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
284 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
287 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
288 as you type. See also the new variable ‘text-quoting-style’.
291 ** New minor mode global-eldoc-mode is enabled by default.
294 ** Emacs now supports "bracketed paste mode" when running on a terminal
295 that supports it. This facility allows Emacs to understand pasted
296 chunks of text as strings to be inserted, instead of interpreting each
297 character in the pasted text as actual user input. This results in a
298 paste experience similar to that under a window system, and significant
299 performance improvements when pasting large amounts of text.
302 ** Emacs now supports the latest version of the UBA.
303 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
304 was updated to support all the latest additions and changes introduced
305 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
306 This includes full support for directional isolates and the
307 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
311 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
314 ** New buffer-local `electric-pair-local-mode'.
317 ** New variable `fast-but-imprecise-scrolling' inhibits
318 fontification during full screen scrolling operations, giving less
319 hesitant operation during auto-repeat of C-v, M-v at the cost of
320 possible inaccuracies in the end position.
323 ** New documentation command `describe-symbol'.
324 Works for functions, variables, faces, etc. It is bound to `C-h o' by
328 ** New function `custom-prompt-customize-unsaved-options' checks for
329 unsaved customizations and prompts user to customize (if found). It
330 is intended for adding to 'kill-emacs-query-functions'.
333 * Changes in Specialized Modes and Packages in Emacs 25.1
338 *** New command `checkdoc-package-keywords' checks if the
339 current package keywords are recognized. Set the new option
340 `checkdoc-package-keywords-flag' to non-nil to make
341 `checkdoc-current-buffer' call this function automatically.
344 *** New function `checkdoc-file' checks for style errors.
345 It's meant for use together with `compile':
346 emacs -batch --eval "(checkdoc-file \"subr.el\")"
349 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
350 It raises an error if a bookmark of that name already exists,
351 unlike `bookmark-set' which silently updates an existing bookmark.
356 *** `imap-ssl-program' has been removed, and imap.el uses the internal
357 GnuTLS encryption functions if possible.
362 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
363 the ordering of object keys by default.
366 *** New commands `json-pretty-print-ordered' and
367 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
368 object keys sorted alphabetically.
371 ** Prog mode has some support for multi-mode indentation.
372 This allows better indentation support in modes that support multiple
373 programming languages in the same buffer, like literate programming
374 environments or ANTLR programs with embedded Python code.
376 A major mode can provide indentation context for a sub-mode through
377 the `prog-indentation-context' variable. To support this, modes that
378 provide indentation should use `prog-widen' instead of `widen' and
379 `prog-first-column' instead of a literal zero. See the node
380 "Mode-Specific Indent" in the ELisp manual for more details.
382 ** Prettify Symbols mode
385 *** Prettify Symbols mode supports custom composition predicates. By
386 overriding the default `prettify-symbols-compose-predicate', modes can
387 specify in which contexts a symbol may be displayed as some Unicode
388 character. `prettify-symbols-default-compose-p' is the default which
389 is suitable for most programming languages such as C or Lisp (but not
393 *** Symbols can be unprettified while point is inside them.
394 New variable `prettify-symbols-unprettify-at-point' configures this.
396 ** Enhanced xterm support
399 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
400 This variable tells Emacs which advanced capabilities are available in
401 the xterm terminal emulator used to display Emacs text-mode frames.
402 The default is to check each capability, and use it if available.
403 (This variable was introduced in Emacs 24.1, but was not announced in
407 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
408 in the surrounding GUI (using the OSC-52 escape sequence). This only works
409 if your xterm supports it and enables the `allowWindowOps' options (disabled
410 by default at least in Debian, for security reasons).
412 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
413 escape sequence) if your xterm has the feature enabled but for that you
414 additionally need to add `getSelection' to `xterm-extra-capabilities'.
417 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
420 ** The `save-place' variable is replaced by `save-place-mode'.
425 *** ERC can now hide message types by network or channel.
426 `erc-hide-list' will hide all messages of the specified type, while
427 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
428 specified message types for the respective specified targets.
430 *** New variable `erc-default-port-tls' used to connect to TLS IRC
436 *** `midnight-mode' is now a proper minor mode.
439 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
444 *** New "external" package status.
445 An external package is any installed package that's not built-in and
446 not from `package-user-dir', which usually means it's from an entry in
447 `package-directory-list'. They are treated much like built-in
448 packages, in that they cannot be deleted through the package menu and
449 are not considered for upgrades.
451 The effect is that a user can manually place a specific version of a
452 package inside `package-directory-list' and the package menu will
456 *** If a package is available on multiple archives and one has higher
457 priority (as per `package-archive-priorities') only that one is
458 listed. This can be configured with `package-menu-hide-low-priority'.
461 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
462 This includes the above-mentioned low-priority packages, as well as
463 available packages whose version is lower than the currently installed
464 version (which were previously impossible to display).
465 This allows users to downgrade a package if a lower version is
469 *** When filtering the package menu, keywords starting with "arc:" or
470 "status:" represent package archive or status, respectively, instead
474 *** Most functions which involve downloading information now take an
475 ASYNC argument. If it is non-nil, package.el performs the download(s)
479 *** New variable `package-menu-async' controls whether the
480 package-menu uses asynchronous downloads.
483 *** `package-install-from-buffer' and `package-install-file' work on directories.
484 This follows the same rules as installing from a .tar file, except the
485 -pkg file is optional.
488 *** Packages which are dependencies of other packages cannot be deleted.
489 The FORCE argument to `package-delete' overrides this.
492 *** New custom variable `package-selected-packages' tracks packages
493 which were installed by the user (as opposed to installed as
494 dependencies). This variable can also be manually customized.
497 *** New command `package-install-user-selected-packages' installs all
498 packages from `package-selected-packages' which are currently missing.
501 *** New command `package-autoremove' removes all packages which were
502 installed strictly as dependencies but are no longer needed.
507 When you invoke `shell' interactively, the *shell* buffer will now
508 display in a new window. However, you can customize this behavior via
509 the `display-buffer-alist' variable. For example, to get
510 the old behavior -- *shell* buffer displays in current window -- use
511 (add-to-list 'display-buffer-alist
512 '("^\\*shell\\*$" . (display-buffer-same-window))).
516 *** The `:protection' slot option is not obeyed any more.
518 *** The `newname' argument to constructors is optional&deprecated.
519 If you need your objects to be named, do it by inheriting from `eieio-named'.
521 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
523 *** The <class> variables are declared obsolete.
525 *** The <initarg> variables are declared obsolete.
526 *** defgeneric and defmethod are declared obsolete.
528 *** `constructor' is now an obsolete alias for `make-instance'.
533 *** New command `ido-bury-buffer-at-head' bound to C-S-b
534 Bury the buffer at the head of `ido-matches', analogous to how C-k
535 kills the buffer at head.
538 *** A prefix argument to `ido-restrict-to-matches' will reverse its
539 meaning, and the list is restricted to those elements that do not
540 match the current input.
545 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
546 The new commands `next-line-or-history-element' and
547 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
548 minibuffer, allow by-line movement through minibuffer history,
549 similarly to an ordinary buffer. Only when point moves over
550 the bottom/top of the minibuffer it goes to the next/previous history
551 element. `M-p' and `M-n' still move directly to previous/next history
554 ** Search and Replace
557 *** New user option `search-default-regexp-mode'
558 specifies the default mode for I-search.
561 *** `isearch' and `query-replace' can now perform character folding in matches.
562 Isearch does that by default, while `query-replace' will do that if
563 the new variable `replace-character-fold' is customized to a non-nil
564 value. This is analogous to case folding, but instead of disregarding
565 case variants, it disregards wider classes of distinctions between
566 similar characters. (Case folding is a special case of character
567 folding.) This means many characters in the search string will match
568 entire groups of characters instead of just themselves.
570 For instance, the " will match all variants of double quotes (like “
571 and ”), and the letter a will match all of its accented cousins, even
572 those composed of multiple characters, as well as many other symbols
576 *** New function `character-fold-to-regexp' can be used
577 by searching commands to produce a regexp matching anything that
578 character-folds into STRING.
581 *** The new M-s M-w key binding uses eww to search the web for the
582 text in the region. The search engine to use for this is specified by
583 the customizable variable `eww-search-prefix'.
586 *** Query-replace history is enhanced.
587 When query-replace reads the FROM string from the minibuffer, typing
588 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
589 and TO are the original text and its replacement, and SEP is an arrow
590 string defined by the new variable `query-replace-from-to-separator'.
591 To select a prior replacement, type `M-p' until the desired
592 replacement appears in the minibuffer, and then exit the minibuffer by
597 *** If `quick-calc' is called with a prefix argument, insert the
598 result of the calculation into the current buffer.
601 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
602 this you can tell Edebug not to stop at the start of the first
603 instrumented function.
608 *** New minor mode `global-eldoc-mode'
609 It is turned on by default, and affects `*scratch*' and other buffers
610 whose major mode supports Emacs Lisp.
613 *** `eldoc-documentation-function' now defaults to `ignore'
616 *** `describe-char-eldoc' displays information about character at point,
617 and can be used as a default value of `eldoc-documentation-function'. It is
618 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
619 ] [, ] [, etc.) while using mono-spaced font.
624 *** HTML can now be rendered using variable-width fonts.
627 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
628 whether to use variable-pitch fonts or not. The user can also
629 customize the `shr-use-fonts' variable.
632 *** A new command `C' (`eww-toggle-colors') can be used to toggle
633 whether to use the HTML-specified colors or not. The user can also
634 customize the `shr-use-colors' variable.
637 *** A new command `R' (`eww-readable') will try do identify the main
638 textual parts of a web page and display only that, leaving menus and
639 the like off the page.
642 *** You can now use several eww buffers in parallel by renaming eww
643 buffers you want to keep separate.
646 *** Partial state of the eww buffers (the URIs and the titles of the
647 pages visited) is now preserved in the desktop file.
650 *** `eww-after-render-hook' is now called after eww has rendered
651 the data in the buffer.
654 *** The `eww-reload' command now takes a prefix to not reload via
655 the net, but just use the local copy of the HTML.
658 *** The DOM shr and eww uses has been changed to the general Emacs
659 xml.el/libxml2 DOM, and a new package dom.el has been added to
660 interact with this DOM. See the Emacs Lisp manual for interface
664 *** `mailcap-mime-data' is now consulted when displaying PDF files.
667 *** The new `S' command will list all eww buffers, and allow managing
671 *** https pages with valid certificates have headers marked in green, while
672 invalid certificates are marked in red.
677 *** text/html messages that contain inline image parts will be
678 transformed into multipart/related messages before sending.
681 ** In Show Paren Mode, a parenthesis can be highlighted when point
682 stands inside it, and certain parens can be highlighted when point is
683 at BOL or EOL, or in whitespace there. To enable these, customize,
684 respectively, `show-paren-when-point-inside-paren' or
685 `show-paren-when-point-in-periphery'.
688 *** Strings after `:documentation' are highlighted as docstrings.
693 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
696 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
697 *** `string-rectangle' provides on-the-fly preview of the result.
700 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
701 These should be used in preference to `font-lock-fontify-buffer' when
705 ** Macro `minibuffer-with-setup-hook' can optionally append a function
706 to `minibuffer-setup-hook'.
708 If the first argument of the macro is of the form `(:append FUN)',
709 then FUN will be appended to `minibuffer-setup-hook', instead of
714 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
716 ** Calendar and diary
719 *** The default `diary-file' is now located in .emacs.d.
722 *** New commands to insert diary entries with Chinese dates:
723 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
724 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
727 *** The calendar can now list and mark diary entries with Chinese dates.
728 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
731 *** The option `calendar-mode-line-format' can now be nil,
732 which means to do nothing special with the mode line in calendars.
735 *** New option `calendar-weekend-days'.
736 The option customizes which day headers receive the
737 `calendar-weekend-header' face.
740 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
743 *** Many items obsolete since at least version 23.1 have been removed.
744 The majority were function/variable/face aliases, too numerous to list here.
747 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
748 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
750 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
752 **** Macro `calendar-for-loop'.
754 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
756 **** The nil and list forms of `diary-display-function'.
759 ** New ERT function `ert-summarize-tests-batch-and-exit'.
760 If the output of ERT tests in batch mode execution can be saved to a
761 log file, then it can be passed as an argument to the above function
762 to produce a neat summary.
764 ** New js.el option `js-indent-first-init'.
769 ** Info mode now displays symbol names in fixed-pitch font.
770 If you want to get the old behavior back, customize the `Info-quoted'
771 face to use the same definitions as the default face.
774 *** `Info-fontify-maximum-menu-size' can be t for no limit.
777 *** `info-display-manual' can now be given a prefix argument which (any
778 non-nil value) directs the command to limit the completion
779 alternatives to currently visited manuals.
782 ** ntlm.el has support for NTLM2.
787 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
788 to delete or undelete multiple messages.
791 *** Rmail can now render HTML mail messages if your Emacs was built with
792 libxml2 or if you have the Lynx browser installed. By default, Rmail
793 will display the HTML version of a mail message that has both HTML and
794 plain text parts, if display of HTML email is possible; customize the
795 `rmail-mime-prefer-html' option to `nil' if you don't want that.
798 *** In the commands that make summaries by subject, recipients, or senders,
799 you can no longer use commas to separate regular expressions.
802 ** SES now supports local printer functions; see `ses-define-local-printer'.
806 *** In sh-mode you can now use `sh-shell' as a file-local variable to
807 specify the type of shell in use (bash, csh, etc).
810 *** New value `always' for `sh-indent-after-continuation'.
811 This provides old-style ("dumb") indentation of continued lines.
812 See the doc string of `sh-indent-after-continuation' for details.
816 *** Fatal TLS errors are now silent by default.
821 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
822 When `url-handler-mode' is enabled, file operations for these
823 protocols as well as for "telnet" and "ftp" are passed to Tramp.
826 *** The URL package allows customizing the `url-user-agent' string.
827 The new `url-user-agent' variable can be customized to be a string or
831 *** The new interface variable `url-request-noninteractive' can be used
832 to specify that we're running in a noninteractive context, and that
833 we should not be queried about things like TLS certificate validity.
836 *** If URL is used with a https connection, the first callback argument
837 plist will contain a :peer element that has the output of
838 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
843 *** New connection method "afp", which allows to access Mac OS X
844 volumes via the Apple Filing Protocol.
847 *** New connection method "nc", which allows to access dumb busyboxes.
850 *** Method-specific parameters can be overwritten now with variable
851 `tramp-connection-properties'.
854 *** Handler for `file-notify-valid-p' for remote machines that support
855 filesystem notifications.
860 *** New user variable `sql-default-directory' enables remote
861 connections using Tramp.
864 *** New command `sql-send-line-and-next'.
865 This command, bound to `C-c C-n' by default, sends the current line to
866 the SQL process and advances to the next line, skipping whitespace and
870 *** Added support for Vertica SQL.
872 ** VC and related modes
875 *** Basic push support, via `vc-push', bound to `C-x v P'.
876 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
877 (undocumented) command vc-hg-push now behaves slightly differently.
880 *** The new command vc-region-history shows the log+diff of the active region.
883 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
884 This command is useful when you perform version control commands
885 outside Emacs (e.g., from the shell prompt), or if you switch the VC
886 back-end for the buffer's file, or remove it from version control.
889 *** New option `vc-annotate-background-mode' controls whether
890 the color range from `vc-annotate-color-map' is applied to the
891 background or to the foreground.
894 *** `compare-windows' now compares text with the most recently selected window
895 instead of the next window. If you want the previous behavior of
896 comparing with the next window, customize the new option
897 `compare-windows-get-window-function' to the value
898 `compare-windows-get-next-window'.
901 *** Two new faces `compare-windows-removed' and `compare-windows-added'
902 replace the face `compare-windows', which is now an obsolete alias for
903 `compare-windows-added'.
906 *** `log-edit-insert-changelog' converts "(tiny change)" to
907 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
911 ** VHDL mode now supports VHDL'08.
916 *** Decimal display mode uses "," groups, so it's more
917 fitting for use in money calculations
920 *** Factorial works with non-integer inputs.
922 ** HideIfDef mode now support full C/C++ expressions, argumented macro
923 expansions, interactive macro evaluation and automatic scanning of
926 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header file
927 name patterns. Default case-insensitive .h, .hh, .hpp, .hxx, and .h++.
928 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
929 reinclusion protected header files from being fully hidden.
930 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
931 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be excluded.
935 *** New custom variable `tex-print-file-extension' to help users who
936 use PDF instead of DVI.
938 *** TeX mode now supports Prettify Symbols mode. When enabling
939 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
940 many other math macros are displayed using unicode characters.
942 ** whitespace-mode: new 'big-indent style highlighting too much indentation.
943 By default, 32 spaces and four TABs are considered to be too much but
944 `whitespace-big-indent-regexp' can be configured to change that.
946 ** tildify: `tildify-space-string', `tildify-pattern', and
947 `tildify-foreach-region-function' variables added making
948 `tildify-string-alist', `tildify-pattern-alist', and
949 `tildify-ignored-environments-alist' variables (as well as a few
950 helper functions) obsolete.
953 The new package provides generic framework and new commands to find
954 and move to definitions, as well as pop back to the original location.
957 `xref-find-definitions' replaces `find-tag' and provides an interface
958 to pick one destination among several. Hence, `tags-loop-continue' is
959 unbound. `xref-pop-marker-stack' replaces `pop-tag-mark', but uses an
960 easier binding, which is now unoccupied (`M-,').
961 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
962 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
963 `xref-find-apropos' replaces `find-tag-regexp'.
966 `find-tag-marker-ring-length' is now an obsolete alias for
967 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
968 alias for a private variable. `xref-push-marker-stack' and
969 `xref-pop-marker-stack' should be used to mutate it instead.
972 *** `xref-find-definitions' and `describe-function' now display
973 information about mode local overrides (defined by cedet/mode-local.el
974 `define-overloadable-function' `define-mode-local-overrides').
977 As a result of the above, these commands are now obsolete:
978 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
979 `tags-apropos' and `tags-loop-continue'.
982 EUDC's LDAP backend has been improved.
984 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
986 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
987 subprocess instead of on the command line.
989 *** EUDC handles LDAP wildcards automatically so the user shouldn't
990 need to configure this manually anymore.
992 *** The LDAP configuration section of EUDC's manual has been
995 There have also been customization changes.
997 *** New custom variable `eudc-server-hotlist' to allow specifying
998 multiple EUDC servers in init file.
1000 *** Custom variable `eudc-inline-query-format' defaults to completing
1001 on email and firstname instead of surname.
1003 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1004 to avoid interfering with the kill ring.
1006 *** Custom variable `eudc-inline-expansion-format' defaults to
1007 "Firstname Surname <mail-address>".
1009 *** Custom variable `eudc-options-file' defaults to
1010 "~/.emacs.d/eudc-options".
1012 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1013 allow overriding the regular expression that recognizes the ldapsearch
1014 command line's password prompt.
1016 EUDC's BBDB backend now supports BBDB 3.
1018 EUDC's PH backend (eudcb-ph.el) is obsolete.
1023 *** The new built-in command `clear' can scroll window contents out of sight.
1024 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1026 *** New buffer syntax '#<buffer-name>', which is equivalent to
1027 '#<buffer buffer-name>'. This shorthand makes interacting with
1028 buffers from eshell more convenient. Custom variable
1029 `eshell-buffer-shorthand', which has been broken for a while, has been
1032 *** By default, eshell "visual" program buffers (created by
1033 `eshell-visual-commands' and similar custom vars) are no longer killed
1034 when their processes die. This fixes issues with short-lived commands
1035 and makes visual programs more useful in general. For example, if
1036 "git log" is a visual command, it will always show the visual command
1037 buffer, even if the "git log" process dies. For the old behavior,
1038 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1042 *** Support for the Conkeror web browser.
1045 *** Support for several ancient browsers is now officially obsolete.
1048 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1049 be added to the archive.
1052 ** Autorevert: dired buffers are also auto-reverted via file
1053 notifications, if Emacs is compiled with file notification support.
1055 ** File Notifications
1058 *** The new event `stopped' signals, that a file notification watch is
1059 not active any longer.
1062 *** The new function `file-notify-valid-p' checks, whether a file
1063 notification descriptor still corresponds to an activate watch.
1068 *** The command `dired-do-compress' bound to `Z' now can compress
1069 directories and decompress zip files.
1072 *** New command `dired-do-compress-to' bound to `c' can be used to
1073 compress many marked files into a single named archive. The
1074 compression command is determined from the new
1075 `dired-compress-files-alist' variable.
1078 *** `W' is now bound to `browse-url-of-dired-file', and is useful for
1079 viewing HTML files and the like.
1081 ** Tabulated List Mode
1084 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1085 call `tabulated-list-init-header', in which case it will have no
1089 *** `tabulated-list-print' takes a second optional argument, update,
1090 which specifies an alternative printing method which is faster when
1091 few or no entries have changed.
1093 ** Obsolete packages
1098 *** landmark.el (moved to elpa.gnu.org)
1101 * New Modes and Packages in Emacs 25.1
1103 ** pinentry.el allows GnuPG passphrase to be prompted through the
1104 minibuffer instead of a graphical dialog, depending on whether the gpg
1105 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1106 is set). This feature requires newer versions of GnuPG (2.1.5 or
1107 later) and Pinentry (0.9.5 or later).
1109 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1111 ** scss-mode (a minor variant of css-mode)
1113 ** let-alist is a new macro (and a package) that allows one to easily
1114 let-bind the values stored in an alist.
1116 ** `tildify-mode' allows to automatically insert hard spaces as one
1117 types the text. Breaking line after a single-character words is
1118 forbidden by Czech and Polish typography (and may be discouraged in
1119 other languages), so `auto-tildify-mode' makes it easier to create
1120 a typographically-correct documents.
1122 ** The `seq' library adds sequence manipulation functions and macros
1123 that complement basic functions provided by subr.el. All functions
1124 are prefixed with `seq-' and work on lists, strings and vectors.
1126 ** The `map' library provides map-manipulation functions that work on
1127 alists, hash-table and arrays. All functions are prefixed with
1130 ** The `thunk' library provides functions and macros to control the
1131 evaluation of forms.
1133 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1134 support for JSX, an XML-like syntax extension to ECMAScript.
1137 * Incompatible Lisp Changes in Emacs 25.1
1140 ** `setq' and `setf' must now be called with an even number of
1141 arguments. The earlier behavior of silently supplying a nil to the
1142 last variable when there was an odd number of arguments has been
1145 ** `syntax-begin-function' is declared obsolete.
1146 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1147 slot in font-lock-defaults.
1150 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1151 called during startup. Users who call this function in their init
1152 file and still expect it to be run after startup should set
1153 `package-enable-at-startup' to t after the call to
1154 `package-initialize'.
1156 ** `:global' minor mode use `setq-default' rather than `setq'.
1157 This means that you can't use `make-local-variable' and expect them to
1158 "magically" become buffer-local.
1160 ** `inhibit-point-motion-hooks' now defaults to t and is obsolete.
1163 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1164 The `track-mouse' form no longer refrains from changing the shape of
1165 the mouse pointer for the entire time the body of that form is
1166 executed. Lisp programs that use `track-mouse' for dragging across
1167 large portions of the Emacs display, and want to avoid changes in the
1168 pointer shape during dragging, should bind the variable `track-mouse'
1169 to the special value `dragging' in the body of the form.
1172 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1173 has any effect. (This change was made in Emacs 24.4 but was not
1174 advertised at the time.)
1176 ** `indirect-function' does not signal `void-function' any more.
1177 This is mostly a bug-fix, since this change was missed back in 24.4 when
1178 symbol-function was changed not to signal `void-function' any more.
1180 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1182 ** Comint, term, and compile do not set the EMACS env var any more.
1183 Use the INSIDE_EMACS environment variable instead.
1185 ** `save-excursion' does not save&restore the mark any more.
1187 ** read-buffer-function can now be called with a 4th argument (`predicate').
1189 ** completion-table-dynamic stays in the minibuffer.
1190 If you want the old behavior of calling the function in the buffer
1191 from which the minibuffer was entered, call it with the new argument
1194 ** window-configurations no longer record the buffers' marks.
1196 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1197 active region handling.
1199 ** deactivate-mark is now buffer-local.
1201 ** `cl-the' now asserts that its argument is of the given type.
1203 ** `process-running-child-p` may now return a numeric process
1204 group ID instead of `t'.
1207 ** Mouse click events on mode line or header line no longer include
1208 any reference to a buffer position. The 6th member of the mouse
1209 position list returned for such events is now nil.
1211 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1212 These slots used to hold key-shortcut data, but have been obsolete since
1215 ** Emacs no longer downcases the first letter of a system diagnostic
1216 when signaling a file error. For example, it now reports "Permission
1217 denied" instead of "permission denied". The old behavior was problematic
1218 in languages like German where downcasing rules depend on grammar.
1221 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1222 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1223 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1224 and apostrophe `like this'. The default value nil acts like ‘curve’
1225 if curved single quotes are displayable, and like ‘grave’ otherwise.
1226 The new variable affects display of diagnostics and help, but not of info.
1229 ** substitute-command-keys now replaces quotes.
1230 That is, it converts documentation strings’ quoting style as per the
1231 value of ‘text-quoting-style’. Doc strings in source code can use
1232 either curved single quotes or grave accents and apostrophes. As
1233 before, characters preceded by \= are output as-is.
1236 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1237 They use the new ‘format-message’ function instead of plain ‘format’,
1238 so that they now follow user preference as per ‘text-quoting-style’
1239 when processing curved single quotes, grave accents, and apostrophes
1240 in their format argument.
1243 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1244 now match multibyte characters using Unicode character properties.
1245 If you want the old behavior where they matched any character with
1246 word syntax, use `\sw' instead.
1249 ** The character classes [:graph:] and [:print:] in regular expressions
1250 no longer match every multibyte character. Instead, Emacs now
1251 consults the Unicode character properties to determine which
1252 characters are graphic or printable. In particular, surrogates and
1253 unassigned codepoints are now rejected. If you want the old behavior,
1254 use [:multibyte:] instead.
1257 ** The `diff' command uses the unified format now. To restore the old
1258 behavior, set `diff-switches' to `-c'.
1260 ** `grep-template' and `grep-find-template' values don't include the
1261 --color argument anymore. It's added at the <C> place holder position
1262 dynamically. Any third-party code that changes these templates should
1263 be updated accordingly.
1266 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1267 The new behavior is compatible with Common Lisp and with XEmacs.
1268 This change does not affect Lisp code intended to be portable to
1269 Emacs 24.2 and earlier, which did not support unary ‘/’.
1272 ** The `default-directory' value doesn't have to end slash. To make
1273 that happen, `unhandled-file-name-directory' now defaults to calling
1274 `file-name-as-directory'.
1277 * Lisp Changes in Emacs 25.1
1280 *** New UPatterns `quote', `app', `cl-struct', `eieio', `seq', and `map'.
1281 *** New UPatterns can be defined with `pcase-defmacro'.
1283 *** New vector QPattern.
1285 ** syntax-propertize is now automatically called on-demand during forward
1286 parsing functions like `forward-sexp'.
1288 ** New hooks prefix-command-echo-keystrokes-functions and
1289 prefix-command-preserve-state-hook, to allow the definition of prefix
1290 commands other than the predefined C-u.
1292 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1294 ** The default value of `load-read-function' is now `read'.
1296 ** New hook `pre-redisplay-functions', a bit easier to use than pre-redisplay-function.
1298 ** The second arg of `looking-back' should always be provided explicitly.
1300 ** Obsolete text properties `intangible', `point-entered', and `point-left'.
1301 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1302 implemented by the new `cursor-intangible-mode' and
1303 `cursor-sensor-mode' minor modes.
1305 ** New process type `pipe', which can be used in combination with the
1306 `:stderr' keyword of make-process to handle standard error output
1309 ** New function `make-process' provides an alternative interface to
1310 `start-process'. It allows programs to set process parameters such as
1311 process filter, sentinel, etc., through keyword arguments (similar to
1312 `make-network-process').
1315 ** A new function `directory-files-recursively' returns all matching
1316 files (recursively) under a directory.
1319 ** New variable `inhibit-message', when bound to non-nil, inhibits
1320 `message' and related functions from displaying messages the Echo
1321 Area. The output is still logged to the *Messages* buffer.
1324 ** A new text property `inhibit-read-only' can be used in read-only
1325 buffers to allow certain parts of the text to be writable.
1328 ** A new variable `comment-end-can-be-escaped' is useful in languages
1329 such as C and C++ where line comments with escaped newlines are
1330 continued to the next line.
1333 ** New macro `define-advice'.
1335 ** `read-buffer' takes a new `predicate' argument.
1337 ** Emacs Lisp now supports generators.
1339 ** New finalizer facility for running code when objects
1342 ** lexical closures can use (:documentation <form>) to build their docstring.
1343 It should be placed right where the docstring would be, and <form> is then
1344 evaluated (and should return a string) when the closure is built.
1346 ** define-inline provides a new way to define inlinable functions.
1348 ** New function `macroexpand-1' to perform a single step of macroexpansion.
1350 ** Some "x-*" were obsoleted:
1351 *** x-select-text is renamed gui-select-text.
1352 *** x-selection-value is renamed gui-selection-value.
1353 *** x-get-selection is renamed gui-get-selection.
1354 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1355 *** x-get-selection-value is renamed to gui-get-primary-selection.
1356 *** x-set-selection is renamed to gui-set-selection
1358 ** New function `string-greaterp', which return the opposite result of
1362 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1363 preserve the collation order as defined by the system's locale(1)
1364 environment. For the time being this is implemented for modern POSIX
1365 systems and for MS-Windows, for other systems they fall back to their
1366 counterparts `string-lessp' and `string-equal'.
1369 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1370 If you want the old, locale-independent sorting, customize the new
1371 option `ls-lisp-use-string-collate' to a nil value.
1374 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1375 if set to a non-nil value, causes the above 2 functions to ignore
1376 symbol and punctuation characters when collating strings. This
1377 emulates the behavior of modern Posix platforms when the locale's
1378 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1379 MS-Windows doesn't support UTF-8 as codeset in its locales.
1381 ** New function `alist-get', which is also a valid place (aka lvalue).
1383 ** New function `funcall-interactively', which works like `funcall'
1384 but makes `called-interactively-p' treat the function as (you guessed it)
1385 called interactively.
1387 ** New function `function-put' to use instead of `put' for function properties.
1390 ** The new function `bidi-find-overridden-directionality' allows to
1391 find characters whose directionality was, perhaps maliciously,
1392 overridden by directional override control characters. Lisp programs
1393 can use this to detect potential phishing of URLs and other links that
1394 exploits bidirectional display reordering.
1397 ** The new function `buffer-substring-with-bidi-context' allows to
1398 copy a portion of a buffer into a different location while preserving
1399 the visual appearance both of the copied text and the text at
1400 destination, even when the copied text includes mixed bidirectional
1401 text and directional control characters.
1404 ** New properties that can be specified with `declare':
1405 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1406 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1407 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1411 ** New macro `with-file-modes', for evaluating expressions with default file
1412 permissions set to temporary values (e.g., for creating private files).
1414 ** You can access the slots of structures using `cl-struct-slot-value'.
1416 ** Function `sort' can deal with vectors.
1418 ** Function `system-name' now returns an updated value if the current
1419 system's name has changed or if the Emacs process has changed systems,
1420 and to avoid long waits it no longer consults DNS to canonicalize the
1421 name. The variable `system-name' is now obsolete.
1424 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1426 ** If `pwd' is called with a prefix argument, insert the current default
1430 ** New functions return extended information about fonts and faces.
1433 *** The function `font-info' now returns more details about a font.
1434 In particular, it now returns the average width of the font's
1435 characters, which can be used for geometry-related calculations.
1438 *** A new function `default-font-width' returns the average width of a
1439 character in the current buffer's default font. If the default face
1440 is remapped (see `face-remapping-alist'), the value for the remapped
1441 face is returned. This function complements the existing function
1442 `default-font-height'.
1445 *** New functions `window-font-height' and `window-font-width' return
1446 the height and average width of characters in a specified face and
1447 window. If FACE is remapped (see `face-remapping-alist'), the
1448 function returns the information for the remapped face.
1451 *** A new function `window-max-chars-per-line' returns the maximal
1452 number of characters that can be displayed on one line. If a face
1453 and/or window are provided, these values are used for the
1454 calculation. This function is different from `window-body-width' in
1455 that it accounts for (i) continuation glyphs, (ii) the size of the
1456 font, and (iii) the specified window.
1459 ** New utilities in subr-x.el:
1460 *** New macros `if-let' and `when-let' allow defining bindings and to
1461 execute code depending whether all values are true.
1462 *** New macros `thread-first' and `thread-last' allow threading a form
1463 as the first or last argument of subsequent forms.
1466 ** Documentation strings now support quoting with curved single quotes
1467 ‘like-this’ in addition to the old style with grave accent and
1468 apostrophe `like-this'. The new style looks better on today's displays.
1469 In the new Electric Quote mode, you can enter curved single quotes
1470 into documentation by typing ` and '. Outside Electric Quote mode,
1471 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1472 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1473 ‘text-quoting-style’, the user can specify how to display doc string
1477 ** New function ‘format-message’ is like ‘format’ and also converts
1478 curved single quotes, grave accents and apostrophes as per
1479 ‘text-quoting-style’.
1482 ** show-help-function's arg is converted via substitute-command-keys
1483 before being passed to the function. Help strings, help-echo
1484 properties, etc. can therefore contain command key escapes and
1488 ** Time-related changes:
1490 *** Time conversion functions now accept an optional ZONE argument
1491 that specifies the time zone rules for conversion. ZONE is omitted or
1492 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1493 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1494 rule. The affected functions are ‘current-time-string’,
1495 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1496 function ‘encode-time’, which already accepted a simple time zone rule
1497 argument, has been extended to accept all the new forms.
1499 *** Time-related functions now consistently accept numbers
1500 (representing seconds since the epoch) and nil (representing the
1501 current time) as well as the usual list-of-integer representation.
1502 Affected functions include `current-time-string', `current-time-zone',
1503 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1504 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1505 `time-to-days', and `time-to-seconds'.
1507 *** The `encode-time-value' and `with-decoded-time-value' macros have
1510 *** `calendar-next-time-zone-transition', `time-add', and
1511 `time-subtract' no longer return time values in the obsolete and
1512 undocumented integer-pair format. Instead, they return a list of two
1516 ** New function `set-binary-mode' allows to switch a standard stream
1517 of the Emacs process to binary I/O mode.
1520 ** The new function `directory-name-p' can be used to check whether a file
1521 name (as returned from, for instance, `file-name-all-completions') is
1522 a directory file name. It returns non-nil if the last character in
1523 the name is a directory separator character (forward slash on GNU and
1524 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1526 ** ASCII approximations to curved quotes are put in standard-display-table
1527 if the terminal cannot display curved quotes.
1529 ** Standard output and error streams now transliterate characters via
1530 standard-display-table, and encode output using locale-coding-system.
1533 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1536 ** New possible value for `system-type': `nacl'.
1537 This is used by Google's Native Client (NaCl).
1539 ** Miscellaneous name change
1541 For consistency with the usual Emacs spelling, the Lisp variable
1542 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1543 The old name should still work, as an obsolescent alias.
1546 * Changes in Frames and Windows Code in Emacs 25.1
1549 ** Emacs can now draw horizontal scroll bars on some platforms that
1550 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1551 Horizontal scroll bars are turned off by default.
1552 *** New function `horizontal-scroll-bars-available-p' telling whether
1553 horizontal scroll bars are available on the underlying system.
1554 *** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1555 bars on all existing and future frames.
1556 *** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1557 scroll bars on the selected frame.
1558 *** New frame parameters `horizontal-scroll-bars' and
1559 `scroll-bar-height' to set horizontal scroll bars and their height
1560 for individual frames and in `default-frame-alist'.
1561 *** New functions `frame-scroll-bar-height' and
1562 `window-scroll-bar-height' return the height of horizontal scroll
1563 bars on a specific frame or window.
1564 *** `set-window-scroll-bars' now accepts five parameters where the last
1565 two specify height and type of the window's horizontal scroll bar.
1566 *** `window-scroll-bars' now returns type and sizes of horizontal scroll
1568 *** New buffer-local variables `horizontal-scroll-bar' and
1569 `scroll-bar-height'.
1572 ** New functions `frame-geometry' and `frame-edges' give access to a
1576 ** New functions `mouse-absolute-pixel-position' and
1577 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1581 ** The function `window-edges' now accepts three additional arguments to
1582 retrieve body, absolute and pixel edges of the window.
1585 ** The functions `window-inside-edges', `window-inside-pixel-edges' and
1586 `window-inside-absolute-pixel-edges' have been renamed to respectively
1587 `window-body-edges', `window-body-pixel-edges' and
1588 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1591 ** New function `window-absolute-pixel-position' to get the screen
1592 coordinates of a visible buffer position.
1595 ** The height of a frame's menu and tool bar are no longer counted in the
1596 frame's text height. This means that the text height stands only for
1597 the height of the frame's root window plus that of the echo area (if
1598 present). This was already the behavior for frames with external tool
1599 and menu bars (like in the Gtk builds) but has now been extended to all
1603 ** Frames now do not necessarily preserve the number of columns or lines
1604 they display when setting default font, menu bar, fringe width, or
1605 scroll bars. In particular, maximized and fullscreen frames are
1606 conceptually never resized if such settings change. For fullheight and
1607 fullwidth frames, the behavior may depend on the toolkit used.
1608 *** New option `frame-inhibit-implied-resize' if non-nil, means that
1609 setting default font, menu bar, fringe width, or scroll bars of a
1610 specific frame does not resize that frame in order to preserve the
1611 number of columns or lines it displays.
1614 ** New function `window-preserve-size' allows to preserve the size of
1615 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1616 `temp-buffer-resize-mode' and `display-buffer'.
1619 ** New `display-buffer' action function `display-buffer-use-some-frame'.
1620 This displays the buffer in an existing frame other than the current
1621 frame, and allows the caller to specify a frame predicate to exclude
1625 ** New minor mode `window-divider-mode' and options
1626 `window-divider-default-places', `window-divider-default-bottom-width'
1627 and `window-divider-default-right-width'.
1629 ** Tearoff menus and detachable toolbars for Gtk+ has been removed.
1630 Those features have been deprecated in Gtk+ for a long time.
1634 *** etags no longer qualifies class members by default.
1636 By default, `etags' will not qualify class members for C-like
1637 object-oriented languages with their class names and namespaces, and
1638 will remove qualifications used explicitly in the code from the tag
1639 names it puts in TAGS files. This is so the etags.el back-end for
1640 `xref-find-definitions' is more accurate and produces less false
1643 Use --class-qualify (-Q) if you want the old default behavior of
1644 qualifying class members in C++, Java, and Objective C. Note that
1645 using -Q might make some class members become "unknown" to `M-.'
1646 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1647 qualified names by hand.
1649 *** New language Ruby
1651 Names of modules, classes, methods, and functions are tagged.
1652 Overloaded operators are also tagged.
1654 *** Improved support for Lua
1656 Etags now tags functions even if the "function" keyword follows some
1657 whitespace at line beginning.
1660 * Changes in Emacs 25.1 on Non-Free Operating Systems
1663 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1664 This includes the makefile.w32-in files in various subdirectories, and
1665 the support files. The file nt/configure.bat now just tells the user
1666 to use the procedure described in nt/INSTALL, by running the Posix
1667 `configure' script in the top-level directory.
1670 ** Building Emacs for MS-Windows requires at least Windows XP
1671 or Windows Server 2003. The built binaries still run on all versions
1672 of Windows starting with Windows 9X.
1675 ** Emacs running on MS-Windows now supports the daemon mode.
1677 ** The byte counts in etags-generated TAGS files are now the same on
1678 MS-Windows as they are on other platforms.
1681 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1682 Pass '--without-ns' to configure to create an X11 build, the old default.
1684 ** OS X 10.5 or older is no longer supported.
1686 ** OS X on PowerPC is no longer supported.
1689 ** New variable `ns-use-fullscreen-animation' controls animation for
1690 non-native NS fullscreen. The default is nil. Set to t to enable
1691 animation when entering and leaving fullscreen. For native OSX fullscreen
1695 ** The new function 'w32-application-type' returns the type of an
1696 MS-Windows application given the name of its executable program file.
1699 ----------------------------------------------------------------------
1700 This file is part of GNU Emacs.
1702 GNU Emacs is free software: you can redistribute it and/or modify
1703 it under the terms of the GNU General Public License as published by
1704 the Free Software Foundation, either version 3 of the License, or
1705 (at your option) any later version.
1707 GNU Emacs is distributed in the hope that it will be useful,
1708 but WITHOUT ANY WARRANTY; without even the implied warranty of
1709 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1710 GNU General Public License for more details.
1712 You should have received a copy of the GNU General Public License
1713 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1719 paragraph-separate: "[
\f]*$"