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 files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
12 and NEWS.1-17 for changes in older Emacs versions.
14 You can narrow news to a specific version by calling `view-emacs-news'
15 with a prefix argument or by typing C-u C-h C-n.
18 +++ indicates that all necessary documentation updates are complete.
19 (This means all relevant manuals in doc/ AND lisp doc-strings.)
20 --- means no change in the manuals is needed.
21 When you add a new item, use the appropriate mark if you are sure it applies,
22 otherwise leave it unmarked.
25 * Installation Changes in Emacs 25.1
28 ** Building Emacs now requires C99 or later.
30 ** Building Emacs now requires GNU make, version 3.81 or later.
32 ** By default, Emacs no longer works on IRIX. We expect that Emacs
33 users are not affected by this, as SGI stopped supporting IRIX in
34 December 2013. If you are affected, please send a bug report. You
35 should be able to work around the problem either by porting the Emacs
36 undumping code to GCC under IRIX, or by configuring --with-wide-int,
37 or by sticking with Emacs 24.4.
39 ** 'configure' now prefers gnustep-config when configuring GNUstep.
40 If gnustep-config is not available, the old heuristics are used.
43 ** The configure option '--with-pkg-config-prog' has been removed.
44 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
47 ** The configure option '--with-mmdf' has been removed.
48 It was no longer useful, as it relied on libraries that are no longer
49 supported, and its presence led to confusion during configuration.
50 This affects only the 'movemail' utility; Emacs itself can still
51 process MMDF-format files as before.
53 ** The configure option '--enable-silent-rules' is now the default,
54 and silent rules are now quieter. To get the old behavior where
55 'make' chatters a lot, configure with '--disable-silent-rules' or
56 build with 'make V=1'.
59 ** The configure option '--with-gameuser' now allows to specify a
60 group instead of a user if its argument is prefixed by ':' (a colon).
61 This will cause the game score files in ${localstatedir}/games/emacs
62 to be owned by that group, and the helper program for updating them to
63 be installed setgid. The option now defaults to the 'games' group.
66 ** The `grep-changelog' script (and its manual page) are no longer included.
67 It has no particular connection to Emacs and has not changed in years,
68 so if you want to use it, you can always take a copy from an older Emacs.
71 * Startup Changes in Emacs 25.1
74 * Changes in Emacs 25.1
76 ** New command `comment-line' bound to `C-x C-;'.
78 ** New function `custom-prompt-customize-unsaved-options' checks for
79 unsaved customizations and prompts user to customize (if found).
82 ** Network security (TLS/SSL certificate validity and the like) is
83 added via the new Network Security Manager (NSM) and controlled via
84 the `network-security-level' variable.
86 ** C-h l now also lists the commands that were run.
89 ** The new M-s M-w key binding uses eww to search the web for the
92 ** M-x suggests shorthands and ignores obsolete commands for completion.
93 ** x-select-enable-clipboard is renamed select-enable-clipboard.
94 x-select-enable-primary and renamed select-enable-primary.
95 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
96 name it), with the proviso that on some systems (e.g. Windows)
97 select-enable-primary is ineffective since the system doesn't
98 have the equivalent of a primary selection.
101 ** terpri gets an optional arg ENSURE to conditionally output a newline.
104 ** New macro `define-advice'.
106 ** `insert-register' now leaves point after the inserted text
107 when called interactively. A prefix argument toggles this behavior.
109 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
112 ** The new variable `term-file-aliases' replaces some files from lisp/term.
113 The function `tty-run-terminal-initialization' consults this variable
114 when deciding what terminal-specific initialization code to run.
117 ** New variable `system-configuration-features', listing some of the
118 main features that Emacs was compiled with. This is mainly intended
119 for use in Emacs bug reports.
122 ** A password is now hidden also when typed in batch mode. Another
123 hiding character but the default `.' can be used by let-binding the
124 variable `read-hide-char'.
126 ** The new functions `string-collate-lessp' and `string-collate-equalp'
127 preserve the collation order as defined by the system's locale(1)
128 environment. For the time being this is implemented for modern POSIX
129 systems and for MS-Windows, for other systems they fall back to their
130 counterparts `string-lessp' and `string-equal'.
132 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
133 If you want the old, locale-independent sorting, customize the new
134 option `ls-lisp-use-string-collate' to a nil value.
136 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
137 if set to a non-nil value, causes the above 2 functions to ignore
138 symbol and punctuation characters when collating strings. This
139 emulates the behavior of modern Posix platforms when the locale's
140 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
141 MS-Windows doesn't support UTF-8 as codeset in its locales.
144 ** The new function `bidi-find-overridden-directionality' allows to
145 find characters whose directionality was, perhaps maliciously,
146 overridden by directional override control characters. Lisp programs
147 can use this to detect potential phishing of URLs and other links that
148 exploits bidirectional display reordering.
151 ** The new function `buffer-substring-with-bidi-context' allows to
152 copy a portion of a buffer into a different location while preserving
153 the visual appearance both of the copied text and the text at
154 destination, even when the copied text includes mixed bidirectional
155 text and directional control characters.
157 ** New variable `ns-use-fullscreen-animation' controls animation for
158 non-native NS fullscreen. The default is nil. Set to t to enable
159 animation when entering and leaving fullscreen. For native OSX fullscreen
162 ** A new text property `inhibit-read-only' can be used in read-only
163 buffers to allow certain parts of the text to be writable.
165 ** A new function `directory-files-recursively' returns all matching
166 files (recursively) under a directory.
168 ** The new `directory-name-p' can be used to check whether a file
169 name (as returned from, for instance, `file-name-all-completions' is
170 a directory file name. It returns non-nil if the last character in
171 the name is a forward slash.
174 ** New variable `fast-but-imprecise-scrolling' inhibits
175 fontification during full screen scrolling operations, giving less
176 hesitant operation during auto-repeat of C-v, M-v at the cost of
177 possible inaccuracies in the end position.
179 ** The function `font-info' now returns more details about a font.
180 In particular, it now returns the average width of the font's
181 characters, which can be used for geometry-related calculations.
183 ** A new function `default-font-width' returns the average width of a
184 character in the current buffer's default font. If the default face
185 is remapped (see `face-remapping-alist'), the value for the remapped
186 face is returned. This function complements the existing function
187 `default-font-height'.
189 ** New functions `window-font-height' and `window-font-width' return
190 the height and average width of characters in a specified face and
191 window. If FACE is remapped (see `face-remapping-alist'), the
192 function returns the information for the remapped face.
194 ** A new function `window-max-chars-per-line' returns the maximal
195 number of characters that can be displayed on one line. If a face
196 and/or window are provided, these values are used for the
197 calculation. This function is different from `window-body-width' in
198 that it accounts for (i) continuation glyphs, (ii) the size of the
199 font, and (iii) the specified window.
201 ** New possible value for `system-type': nacl.
204 * Editing Changes in Emacs 25.1
206 ** Successive single-char deletions are collapsed in the undo-log just like
207 successive char insertions.
209 ** Unicode names entered via C-x 8 RET now use substring completion by default.
211 ** New minor mode global-eldoc-mode is enabled by default.
213 ** Emacs now supports "bracketed paste mode" when running on a terminal
214 that supports it. This facility allows Emacs to understand pasted
215 chunks of text as strings to be inserted, instead of interpreting each
216 character in the pasted text as actual user input. This results in a
217 paste experience similar to that under a window system, and significant
218 performance improvements when pasting large amounts of text.
220 ** Emacs now supports the latest version of the UBA.
221 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
222 was updated to support all the latest additions and changes introduced
223 in Unicode Standard versions 6.3 and 7.0, and a few changes suggested
224 for Unicode 8.0. This includes full support for directional isolates
225 and the Bidirectional Parentheses Algorithm (BPA) specified by these
228 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
231 ** New buffer-local `electric-pair-local-mode'.
234 * Changes in Specialized Modes and Packages in Emacs 25.1
235 ** In xterms, killing text now also sets the CLIPBOARD/PRIMARY selection
236 in the surrounding GUI (using the OSC-52 escape sequence).
238 ** xterm-mouse-mode now supports mouse-tracking (if your xterm supports it).
241 *** Most functions which involve downloading information now take an
242 ASYNC argument. If it is non-nil, package.el performs the download(s)
245 *** New variable `package-menu-async' controls whether the
246 package-menu uses asynchronous downloads.
248 *** `package-install-from-buffer' and `package-install-file' work on directories.
249 This follows the same rules as installing from a .tar file, except the
250 -pkg file is optional.
252 *** Packages which are dependencies of other packages cannot be deleted.
253 The FORCE argument to `package-delete' overrides this.
255 *** New custom variable `package-selected-packages' tracks packages
256 which were installed by the user (as opposed to installed as
257 dependencies). This variable can also be manually customized.
259 *** New command `package-install-user-selected-packages' installs all
260 packages from `package-selected-packages' which are currently missing.
262 *** New command `package-autoremove' removes all packages which were
263 installed strictly as dependencies but are no longer needed.
267 When you invoke `shell' interactively, the *shell* buffer will now
268 display in a new window. However, you can customize this behavior via
269 the `display-buffer-alist' variable. For example, to get
270 the old behavior -- *shell* buffer displays in current window -- use
271 (add-to-list 'display-buffer-alist
272 '("^\\*shell\\*$" . (display-buffer-same-window))).
277 *** The `:protection' slot option is not obeyed any more.
279 *** The `newname' argument to constructors is optional&deprecated.
280 If you need your objects to be named, do it by inheriting from `eieio-named'.
282 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
284 *** The <class> variables are declared obsolete.
286 *** The <initarg> variables are declared obsolete.
287 *** defgeneric and defmethod are declared obsolete.
289 *** `constructor' is now an obsolete alias for `make-instance'.
292 *** New command `ido-bury-buffer-at-head' bound to C-S-b
293 Bury the buffer at the head of `ido-matches', analogous to how C-k
294 kills the buffer at head.
298 *** You can use <up> and <down> keys to move point in the multi-line
299 minibuffer just as in an ordinary buffer. Only when point moves over
300 the bottom/top of the minibuffer it goes to the next/previous history
301 element. The new commands bound to <up> and <down> in the minibuffer:
302 `next-line-or-history-element' and `previous-line-or-history-element'.
304 ** Search and Replace
306 *** Query-replace history is enhanced.
307 When query-replace reads the FROM string from the minibuffer, typing
308 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
309 and TO are the original text and its replacement, and SEP is an arrow
310 string defined by the new variable `query-replace-from-to-separator'.
311 To select a prior replacement, type `M-p' until the desired
312 replacement appears in the minibuffer, and then exit the minibuffer by
317 *** If `quick-calc' is called with a prefix argument, insert the
318 result of the calculation into the current buffer.
321 *** New minor mode `global-eldoc-mode'
322 *** `eldoc-documentation-function' now defaults to `ignore'
323 *** `describe-char-eldoc' displays information about character at point,
324 and can be used as a default value of `eldoc-documentation-function'. It is
325 useful when, for example, one needs to distinguish various spaces (e.g. ]Â [,
326 ] [, ] [, etc.) while using mono-spaced font.
331 *** HTML can now be rendered using variable-width fonts.
334 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
335 whether to use variable-pitch fonts or not. The user can also
336 customize the `shr-use-fonts' variable.
339 *** A new command `R' (`eww-readable') will try do identify the main
340 textual parts of a web page and display only that, leaving menus and
341 the like off the page.
344 *** You can now use several eww buffers in parallel by renaming eww
345 buffers you want to keep separate.
348 *** Partial state of the eww buffers (the URIs and the titles of the
349 pages visited) is now preserved in the desktop file.
352 *** `eww-after-render-hook' is now called after eww has rendered
353 the data in the buffer.
356 *** The `eww-reload' command now takes a prefix to not reload via
357 the net, but just use the local copy of the HTML.
360 *** The DOM shr and eww uses has been changed to the general Emacs
361 xml.el/libxml2 DOM, and a new package dom.el has been added to
362 interact with this DOM. See the Emacs Lisp manual for interface
366 *** `mailcap-mime-data' is now consulted when displaying PDF files.
369 *** The new `S' command will list all eww buffers, and allow managing
373 *** https pages with valid certificates have headers marked in green, while
374 invalid certificates are marked in red.
378 *** text/html messages that contain inline image parts will be
379 transformed into multipart/related messages before sending.
382 *** New UPatterns `quote', `app', `cl-struct', and `eieio'.
383 *** New UPatterns can be defined with `pcase-defmacro'.
385 *** New vector QPattern.
388 *** Strings after `:documentation' are highlighted as docstrings.
391 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
392 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
393 *** `string-rectangle' provides on-the-fly preview of the result.
395 ** New font-lock functions font-lock-ensure and font-lock-flush, which
396 should be used instead of font-lock-fontify-buffer when called from Elisp.
398 ** Macro `minibuffer-with-setup-hook' takes (:append FUN) to mean
399 appending FUN to `minibuffer-setup-hook'.
402 *** New functions cl-fresh-line, cl-digit-char-p and cl-parse-integer.
406 The seq library adds sequence manipulation functions and macros that
407 complement basic functions provided by subr.el. All functions are
408 prefixed with `seq-' and work on lists, strings and vectors.
410 ** Calendar and diary
413 *** New commands to insert diary entries with Chinese dates:
414 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
415 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
418 *** The calendar can now list and mark diary entries with Chinese dates.
419 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
422 *** The option `calendar-mode-line-format' can now be nil,
423 which means to do nothing special with the mode line in calendars.
426 *** Many items obsolete since at least version 23.1 have been removed.
427 The majority were function/variable/face aliases, too numerous to list here.
430 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
431 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
433 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
435 **** Macro `calendar-for-loop'.
437 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
439 **** The nil and list forms of `diary-display-function'.
441 ** New ERT function `ert-summarize-tests-batch-and-exit'.
443 ** New js.el option `js-indent-first-init'.
446 ** `Info-fontify-maximum-menu-size' can be t for no limit.
449 ** `info-display-manual' can now be given a prefix argument which (any
450 non-nil value) directs the command to limit the completion
451 alternatives to currently visited manuals.
454 ** ntlm.el has support for NTLM2.
457 ** The Rmail commands d, C-d and u now handle repeat counts to delete or
458 undelete multiple messages.
460 ** Rmail can now render HTML mail messages if your Emacs was built with
461 libxml2 or if you have the Lynx browser installed. By default, Rmail
462 will display the HTML version of a mail message that has both HTML and
463 plain text parts, if display of HTML email is possible; customize the
464 `rmail-mime-prefer-html' option to `nil' if you don't want that.
466 ** SES now supports local printer functions; see `ses-define-local-printer'.
468 ** In sh-mode, you can now use `sh-shell' as a file-local variable to
469 specify the type of shell in use (bash, csh, etc).
473 *** Fatal TLS errors are now silent by default.
477 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
478 When `url-handler-mode' is enabled, file operations for these
479 protocols as well as for "telnet" and "ftp" are passed to Tramp.
481 *** The URL package allows customizing the `url-user-agent' string.
482 The new `url-user-agent' variable can be customized to be a string or
485 *** The new interface variable `url-request-noninteractive' can be used
486 to specify that we're running in a noninteractive context, and that
487 we should not be queried about things like TLS certificate validity.
489 *** If URL is used with a https connection, the first callback argument
490 plist will contain a :peer element that has the output of
491 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
495 *** New connection method "nc", which allows to access dumb busyboxes.
499 *** New user variable `sql-default-directory' enables remote
500 connections using Tramp.
502 *** New command `sql-send-line-and-next' sends the current line to the
503 interactive buffer and advances to the next line, skipping whitespace
506 *** Add support for Vertica SQL.
508 ** VC and related modes
510 *** The new command vc-region-history shows the log+diff of the active region.
512 *** New option `vc-annotate-background-mode' controls whether
513 the color range from `vc-annotate-color-map' is applied to the
514 background or to the foreground.
516 *** `compare-windows' now compares text with the most recently used window
517 instead of the next window. The new option `compare-windows-get-window-function'
518 allows to customize this.
520 *** Two new faces `compare-windows-removed' and `compare-windows-added'
521 replace the obsolete face `compare-windows'.
523 ** VHDL mode supports VHDL'08.
525 ** Calculator: decimal display mode uses "," groups, so it's more
526 fitting for use in money calculations; factorial works with
529 ** HideIfDef mode now support full C/C++ expressions, argumented macro expansions
530 , interactive macro evaluation and automatic scanning of #defined symbols.
532 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header file
533 name patterns. Default case-insensitive .h, .hh, .hpp and .hxx.
534 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
535 reinclusion protected header files from being fully hidden.
536 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
537 name patterns (e.x. all "FOR_DOXYGEN_ONLY_*") to be excluded.
541 *** New custom variable `tex-print-file-extension' to help users who
542 use PDF instead of DVI.
544 ** whitespace-mode: new 'big-indent style highlighting too much indentation.
545 By default, 32 spaces and four TABs are considered to be too much but
546 `whitespace-big-indent-regexp' can be configured to change that.
548 ** tildify: `tildify-space-string', `tildify-pattern', and
549 `tildify-foreach-region-function' variables added making
550 `tildify-string-alist', `tildify-pattern-alist', and
551 `tildify-ignored-environments-alist' variables (as well as a few
552 helper functions) obsolete.
555 The new package provides generic framework and new commands to find
556 and move to definitions, as well as pop back to the original location.
559 `xref-find-definitions' replaces `find-tag' and provides an interface
560 to pick one destination among several. Hence, `tags-loop-continue' is
561 unbound. `xref-pop-marker-stack' replaces `pop-tag-mark', but uses an
562 easier binding, which is now unoccupied (`M-,').
563 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
564 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
565 `xref-find-apropos' replaces `find-tag-regexp'.
568 `find-tag-marker-ring-length' is now an obsolete alias for
569 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
570 alias for a private variable. `xref-push-marker-stack' and
571 `xref-pop-marker-stack' should be used to mutate it instead.
574 As a result of the above, these commands are now obsolete:
575 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
576 `tags-apropos' and `tags-loop-continue'.
579 EUDC's LDAP backend has been improved.
581 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
583 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
584 subprocess instead of on the command line.
586 *** EUDC handles LDAP wildcards automatically so the user shouldn't
587 need to configure this manually anymore.
589 *** The LDAP configuration section of EUDC's manual has been
592 There have also been customization changes.
594 *** New custom variable `eudc-server-hotlist' to allow specifying
595 multiple EUDC servers in init file.
597 *** Custom variable `eudc-inline-query-format' defaults to completing
598 on email and firstname instead of surname.
600 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
601 to avoid interfering with the kill ring.
603 *** Custom variable `eudc-inline-expansion-format' defaults to
604 "Firstname Surname <mail-address>".
606 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
607 allow overriding the regular expression that recognizes the ldapsearch
608 command line's password prompt.
613 *** The new built-in command `clear' can scroll window contents out of sight.
614 If provided with an optional non-nil argument, the scrollback contents will be cleared.
618 *** Support for the Conkeror web browser.
621 *** Support for several ancient browsers is now officially obsolete.
624 ** tar-mode: new `tar-new-entry' command, allowing for new members to
625 be added to the archive.
627 ** Autorevert: dired buffers are also auto-reverted via file
628 notifications, if Emacs is compiled with file notification support.
636 ** The character classes [:graph:] and [:print:] in regular expressions
637 no longer match every multibyte character. Instead, Emacs now
638 consults the Unicode character properties to determine which
639 characters are graphic or printable. In particular, surrogates and
640 unassigned codepoints are now rejected. If you want the old behavior,
641 use [:multibyte:] instead.
644 * New Modes and Packages in Emacs 25.1
646 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
648 ** scss-mode (a minor variant of css-mode)
650 ** let-alist is a new macro (and a package) that allows one to easily
651 let-bind the values stored in an alist.
653 ** `tildify-mode' allows to automatically insert hard spaces as one
654 types the text. Breaking line after a single-character words is
655 forbidden by Czech and Polish typography (and may be discouraged in
656 other languages), so `auto-tildify-mode' makes it easier to create
657 a typographically-correct documents.
659 * Incompatible Lisp Changes in Emacs 25.1
661 ** Comint, term, and compile do not set the EMACS env var any more.
662 Use the INSIDE_EMACS environment variable instead.
664 ** `save-excursion' does not save&restore the mark any more.
666 ** read-buffer-function can now be called with a 4th argument (`predicate').
668 ** completion-table-dynamic stays in the minibuffer.
669 If you want the old behavior of calling the function in the buffer
670 from which the minibuffer was entered, call it with the new argument
673 ** window-configurations no longer record the buffers's marks.
675 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
676 active region handling.
678 ** deactivate-mark is now buffer-local.
680 ** `cl-the' now asserts that its argument is of the given type.
682 ** `process-running-child-p` may now return a numeric process
683 group ID instead of `t'.
686 ** Mouse click events on mode line or header line no longer include
687 any reference to a buffer position. The 6th member of the mouse
688 position list returned for such events is now nil.
690 ** Menu items in keymaps do not support the "key shortcut cache" any more.
691 These slots used to hold key-shortcut data, but have been obsolete since
694 ** Emacs no longer downcases the first letter of a system diagnostic
695 when signaling a file error. For example, it now reports "Permission
696 denied" instead of "permission denied". The old behavior was problematic
697 in languages like German where downcasing rules depend on grammar.
700 ** The character classes [:alpha:] and [:alnum:] in regular expressions
701 now match multibyte characters using Unicode character properties.
702 If you want the old behavior where they matched any character with
703 word syntax, use `\sw' instead.
706 ** The `diff' command uses the unified format now. To restore the old
707 behavior, set `diff-switches' to `-c'.
710 * Lisp Changes in Emacs 25.1
712 ** New hook `pre-redisplay-functions', a bit easier to use than pre-redisplay-function.
714 ** The second arg of `looking-back' should always be provided explicitly.
716 ** Obsolete text properties `intangible', `point-entered', and `point-left'.
717 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
718 implemented by the new `cursor-intangible-mode' and
719 `cursor-sensor-mode' minor modes.
721 ** New process type `pipe', which can be used in combination with the
722 `:stderr' keyword of make-process to handle standard error output
725 ** New function `make-process' provides an alternative interface to
726 `start-process'. It allows programs to set process parameters such as
727 process filter, sentinel, etc., through keyword arguments (similar to
728 `make-network-process').
730 ** `read-buffer' takes a new `predicate' argument.
732 ** Emacs Lisp now supports generators.
734 ** New finalizer facility for running code when objects
737 ** lexical closures can use (:documentation <form>) to build their docstring.
738 It should be placed right where the docstring would be, and <form> is then
739 evaluated (and should return a string) when the closure is built.
741 ** define-inline provides a new way to define inlinable functions.
743 ** New function macroexpand-1 to perform a single step of macroexpansion.
745 ** Some "x-*" were obsoleted:
746 *** x-select-text is renamed gui-select-text.
747 *** x-selection-value is renamed gui-selection-value.
748 *** x-get-selection is renamed gui-get-selection.
749 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
750 *** x-get-selection-value is renamed to gui-get-primary-selection.
751 *** x-set-selection is renamed to gui-set-selection
753 ** New function `alist-get', which is also a valid place (aka lvalue).
755 ** New function `funcall-interactively', which works like `funcall'
756 but makes `called-interactively-p' treat the function as (you guessed it)
757 called interactively.
759 ** New function `function-put' to use instead of `put' for function properties.
762 ** New properties that can be specified with `declare':
763 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
764 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
765 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
769 ** New macro `with-file-modes', for evaluating expressions with default file
770 permissions set to temporary values (e.g., for creating private files).
772 ** You can access the slots of structures using `cl-struct-slot-value'.
774 ** Functions `rmail-delete-forward' and `rmail-delete-backward' take an
775 optional repeat-count argument.
777 ** Function `sort' can deal with vectors.
779 ** Function `system-name' now returns an updated value if the current
780 system's name has changed or if the Emacs process has changed systems,
781 and to avoid long waits it no longer consults DNS to canonicalize the
782 name. The variable `system-name' is now obsolete.
785 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
788 ** New utilities in subr-x.el:
789 *** New macros `if-let' and `when-let' allow defining bindings and to
790 execute code depending whether all values are true.
791 *** New macros `thread-first' and `thread-last' allow threading a form
792 as the first or last argument of subsequent forms.
795 ** Time-related changes:
797 *** Time-related functions now consistently accept numbers
798 (representing seconds since the epoch) and nil (representing the
799 current time) as well as the usual list-of-integer representation.
800 Affected functions include `current-time-string', `current-time-zone',
801 `decode-time', `float-time', `format-time-string', `seconds-to-time',
802 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
803 `time-to-days', and `time-to-seconds'.
805 *** The `encode-time-value' and `with-decoded-time-value' macros have
808 *** `calendar-next-time-zone-transition', `time-add', and
809 `time-subtract' no longer return time values in the obsolete and
810 undocumented integer-pair format. Instead, they return a list of two
814 ** New function `set-binary-mode' allows to switch a standard stream
815 of the Emacs process to binary I/O mode.
817 ** Miscellaneous name change
819 For consistency with the usual Emacs spelling, the Lisp variable
820 `hfy-optimisations' has been renamed to `hfy-optimizations'.
821 The old name should still work, as an obsolescent alias.
824 * Changes in Frames and Windows Code in Emacs 25.1
827 ** Emacs can now draw horizontal scroll bars on some platforms that
828 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
829 Horizontal scroll bars are turned off by default.
830 *** New function `horizontal-scroll-bars-available-p' telling whether
831 horizontal scroll bars are available on the underlying system.
832 *** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
833 bars on all existing and future frames.
834 *** New function `toggle-horizontal-scroll-bar' to toggle horizontal
835 scroll bars on the selected frame.
836 *** New frame parameters `horizontal-scroll-bars' and
837 `scroll-bar-height' to set horizontal scroll bars and their height
838 for individual frames and in `default-frame-alist'.
839 *** New functions `frame-scroll-bar-height' and
840 `window-scroll-bar-height' return the height of horizontal scroll
841 bars on a specific frame or window.
842 *** `set-window-scroll-bars' now accepts five parameters where the last
843 two specify height and type of the window's horizontal scroll bar.
844 *** `window-scroll-bars' now returns type and sizes of horizontal scroll
846 *** New buffer-local variables `horizontal-scroll-bar' and
850 ** The height of a frame's menu and tool bar are no longer counted in the
851 frame's text height. This means that the text height stands only for
852 the height of the frame's root window plus that of the echo area (if
853 present). This was already the behavior for frames with external tool
854 and menu bars (like in the Gtk builds) but has now been extended to all
858 ** Frames now do not necessarily preserve the number of columns or lines
859 they display when setting default font, menu bar, fringe width, or
860 scroll bars. In particular, maximized and fullscreen frames are
861 conceptually never resized if such settings change. For fullheight and
862 fullwidth frames, the behavior may depend on the toolkit used.
863 *** New option `frame-inhibit-implied-resize' if non-nil, means that
864 setting default font, menu bar, fringe width, or scroll bars of a
865 specific frame does not resize that frame in order to preserve the
866 number of columns or lines it displays.
869 ** New function `window-preserve-size' allows to preserve the size of
870 windows without "fixing" it. It's supported by `fit-window-to-buffer',
871 `temp-buffer-resize-mode' and `display-buffer'.
873 ** Tearoff menus and detachable toolbars for Gtk+ has been removed.
874 Those features have been deprecated in Gtk+ for a long time.
877 * Changes in Emacs 25.1 on Non-Free Operating Systems
880 ** Building Emacs for MS-Windows requires at least Windows XP
881 or Windows Server 2003. The built binaries still run on all versions
882 of Windows starting with Windows 9X.
885 ** Emacs running on MS-Windows now supports the daemon mode.
887 ** OS X 10.5 or older is no longer supported.
889 ** OS X on PowerPC is no longer supported.
892 ----------------------------------------------------------------------
893 This file is part of GNU Emacs.
895 GNU Emacs is free software: you can redistribute it and/or modify
896 it under the terms of the GNU General Public License as published by
897 the Free Software Foundation, either version 3 of the License, or
898 (at your option) any later version.
900 GNU Emacs is distributed in the hope that it will be useful,
901 but WITHOUT ANY WARRANTY; without even the implied warranty of
902 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
903 GNU General Public License for more details.
905 You should have received a copy of the GNU General Public License
906 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
912 paragraph-separate: "[
\f]*$"