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.
40 ** The configure option `--with-pkg-config-prog' has been removed.
41 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
43 ** The configure option '--enable-silent-rules' and the command
44 'make V=0' now do a better job of suppressing chatter.
47 ** The `grep-changelog' script (and its manual page) are no longer included.
48 It has no particular connection to Emacs and has not changed in years,
49 so if you want to use it, you can always take a copy from an older Emacs.
52 * Startup Changes in Emacs 25.1
55 * Changes in Emacs 25.1
57 ** New function `custom-prompt-customize-unsaved-options' checks for
58 unsaved customizations and prompts user to customize (if found).
61 ** Network security (TLS/SSL certificate validity and the like) is
62 added via the new Network Security Manager (NSM) and controlled via
63 the `network-security-level' variable.
65 ** C-h l now also lists the commands that were run.
68 ** The new M-s M-w key binding uses eww to search the web for the
71 ** M-x suggests shorthands and ignores obsolete commands for completion.
72 ** x-select-enable-clipboard is renamed select-enable-clipboard.
73 x-select-enable-primary and renamed select-enable-primary.
74 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
75 name it), with the proviso that on some systems (e.g. Windows)
76 select-enable-primary is ineffective since the system doesn't
77 have the equivalent of a primary selection.
80 ** terpri gets an optional arg ENSURE to conditionally output a newline.
83 ** New macro `define-advice'.
85 ** `insert-register' now leaves point after the inserted text
86 when called interactively. A prefix argument toggles this behavior.
88 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
91 ** The new variable `term-file-aliases' replaces some files from lisp/term.
92 The function `tty-run-terminal-initialization' consults this variable
93 when deciding what terminal-specific initialization code to run.
96 ** New variable `system-configuration-features', listing some of the
97 main features that Emacs was compiled with. This is mainly intended
98 for use in Emacs bug reports.
101 ** A password is now hidden also when typed in batch mode. Another
102 hiding character but the default `.' can be used by let-binding the
103 variable `read-hide-char'.
105 ** The new functions `string-collate-lessp' and `string-collate-equalp'
106 preserve the collation order as defined by the system's locale(1)
107 environment. For the time being this is implemented for modern POSIX
108 systems and for MS-Windows, for other systems they fall back to their
109 counterparts `string-lessp' and `string-equal'.
111 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
112 If you want the old, locale-independent sorting, customize the new
113 option `ls-lisp-use-string-collate' to a nil value.
115 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
116 if set to a non-nil value, causes the above 2 functions to ignore
117 symbol and punctuation characters when collating strings. This
118 emulates the behavior of modern Posix platforms when the locale's
119 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
120 MS-Windows doesn't support UTF-8 as codeset in its locales.
123 ** The new function `bidi-find-overridden-directionality' allows to
124 find characters whose directionality was, perhaps maliciously,
125 overridden by directional override control characters. Lisp programs
126 can use this to detect potential phishing of URLs and other links that
127 exploits bidirectional display reordering.
130 ** The new function `buffer-substring-with-bidi-context' allows to
131 copy a portion of a buffer into a different location while preserving
132 the visual appearance both of the copied text and the text at
133 destination, even when the copied text includes mixed bidirectional
134 text and directional control characters.
136 ** New variable `ns-use-fullscreen-animation' controls animation for
137 non-native NS fullscreen. The default is nil. Set to t to enable
138 animation when entering and leaving fullscreen. For native OSX fullscreen
141 ** A new text property `inhibit-read-only' can be used in read-only
142 buffers to allow certain parts of the text to be writable.
144 ** A new function `file-tree-walk' allows to apply a certain action
145 to all the files and subdirectories of a directory, similarly to the C
146 library function `ftw'.
148 ** A new function `directory-files-recursively' returns all matching
149 files (recursively) under a directory.
151 ** The new `directory-name-p' can be used to check whether a file
152 name (as returned from, for instance, `file-name-all-completions' is
153 a directory file name. It returns non-nil if the last character in
154 the name is a forward slash.
157 ** New variable `fast-but-imprecise-scrolling' inhibits
158 fontification during full screen scrolling operations, giving less
159 hesitant operation during auto-repeat of C-v, M-v at the cost of
160 possible inaccuracies in the end position.
162 ** The function `font-info' now returns more details about a font.
163 In particular, it now returns the average width of the font's
164 characters, which can be used for geometry-related calculations.
167 * Editing Changes in Emacs 25.1
169 ** Unicode names entered via C-x 8 RET now use substring completion by default.
171 ** New minor mode global-eldoc-mode is enabled by default.
173 ** Emacs now supports "bracketed paste mode" when running on a terminal
174 that supports it. This facility allows Emacs to understand pasted
175 chunks of text as strings to be inserted, instead of interpreting each
176 character in the pasted text as actual user input. This results in a
177 paste experience similar to that under a window system, and significant
178 performance improvements when pasting large amounts of text.
180 ** Emacs now supports the latest version of the UBA.
181 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
182 was updated to support all the latest additions and changes introduced
183 in Unicode Standard versions 6.3 and 7.0, and a few changes suggested
184 for Unicode 8.0. This includes full support for directional isolates
185 and the Bidirectional Parentheses Algorithm (BPA) specified by these
188 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
191 * Changes in Specialized Modes and Packages in Emacs 25.1
194 When you invoke `shell' interactively, the *shell* buffer will now
195 display in a new window. However, you can customize this behavior via
196 the new `shell-display-buffer-actions' variable. For example, to get
197 the old behavior -- *shell* buffer displays in current window -- use
198 (setq shell-display-buffer-actions '(display-buffer-same-window)).
201 *** New command `ido-bury-buffer-at-head' bound to C-S-b
202 Bury the buffer at the head of `ido-matches', analogous to how C-k
203 kills the buffer at head.
207 *** You can use <up> and <down> keys to move point in the multi-line
208 minibuffer just as in an ordinary buffer. Only when point moves over
209 the bottom/top of the minibuffer it goes to the next/previous history
210 element. The new commands bound to <up> and <down> in the minibuffer:
211 `next-line-or-history-element' and `previous-line-or-history-element'.
213 ** Search and Replace
215 *** Query-replace history is enhanced.
216 When query-replace reads the FROM string from the minibuffer, typing
217 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
218 and TO are the original text and its replacement, and SEP is an arrow
219 string defined by the new variable `query-replace-from-to-separator'.
220 To select a prior replacement, type `M-p' until the desired
221 replacement appears in the minibuffer, and then exit the minibuffer by
226 *** If `quick-calc' is called with a prefix argument, insert the
227 result of the calculation into the current buffer.
230 *** New minor mode global-eldoc-mode
231 *** eldoc-documentation-function now defaults to nil
236 *** A new command `R' (`eww-readable') will try do identify the main
237 textual parts of a web page and display only that, leaving menus and
238 the like off the page.
241 *** You can now use several eww buffers in parallel by renaming eww
242 buffers you want to keep separate.
245 *** Partial state of the eww buffers (the URIs and the titles of the
246 pages visited) is now preserved in the desktop file.
249 *** `eww-after-render-hook' is now called after eww has rendered
250 the data in the buffer.
253 *** The `eww-reload' command now takes a prefix to not reload via
254 the net, but just use the local copy of the HTML.
257 *** The DOM shr and eww uses has been changed to the general Emacs
258 xml.el/libxml2 DOM, and a new package dom.el has been added to
259 interact with this DOM. See the Emacs Lisp manual for interface
263 *** `mailcap-mime-data' is now consulted when displaying PDF files.
266 *** The new `S' command will list all eww buffers, and allow managing
270 *** https pages with valid certificates have headers marked in green, while
271 invalid certificates are marked in red.
275 *** text/html messages that contain inline image parts will be
276 transformed into multipart/related messages before sending.
279 *** New UPatterns `quote' and `app'.
280 *** New UPatterns can be defined with `pcase-defmacro'.
282 *** New vector QPattern.
285 *** Strings after `:documentation' are highlighted as docstrings.
288 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
289 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
290 *** `string-rectangle' provides on-the-fly preview of the result.
292 ** New font-lock functions font-lock-ensure and font-lock-flush, which
293 should be used instead of font-lock-fontify-buffer when called from Elisp.
295 ** Macro `minibuffer-with-setup-hook' takes (:append FUN) to mean
296 appending FUN to `minibuffer-setup-hook'.
299 *** New functions cl-fresh-line, cl-digit-char-p and cl-parse-integer.
303 The seq library adds sequence manipulation functions and macros that
304 complement basic functions provided by subr.el. All functions are
305 prefixed with `seq-' and work on lists, strings and vectors.
307 ** Calendar and diary
310 *** New commands to insert diary entries with Chinese dates:
311 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
312 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
315 *** The calendar can now list and mark diary entries with Chinese dates.
316 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
319 *** The option `calendar-mode-line-format' can now be nil,
320 which means to do nothing special with the mode line in calendars.
323 *** Many items obsolete since at least version 23.1 have been removed.
324 The majority were function/variable/face aliases, too numerous to list here.
327 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
328 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
330 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
332 **** Macro `calendar-for-loop'.
334 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
336 **** The nil and list forms of `diary-display-function'.
338 ** New ERT function `ert-summarize-tests-batch-and-exit'.
341 ** `Info-fontify-maximum-menu-size' can be t for no limit.
344 ** `info-display-manual' can now be given a prefix argument which (any
345 non-nil value) directs the command to limit the completion
346 alternatives to currently visited manuals.
349 ** ntlm.el has support for NTLM2.
352 ** The Rmail commands d, C-d and u now handle repeat counts to delete or
353 undelete multiple messages.
355 ** Rmail can now render HTML mail messages if your Emacs was built with
356 libxml2 or if you have the Lynx browser installed. By default, Rmail
357 will display the HTML version of a mail message that has both HTML and
358 plain text parts, if display of HTML email is possible; customize the
359 `rmail-mime-prefer-html' option to `nil' if you don't want that.
361 ** SES now supports local printer functions; see `ses-define-local-printer'.
363 ** In sh-mode, you can now use `sh-shell' as a file-local variable to
364 specify the type of shell in use (bash, csh, etc).
368 *** Fatal TLS errors are now silent by default.
372 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
373 When `url-handler-mode' is enabled, file operations for these
374 protocols as well as for "telnet" and "ftp" are passed to Tramp.
376 *** The URL package allows customizing the `url-user-agent' string.
377 The new `url-user-agent' variable can be customized to be a string or
380 *** The new interface variable `url-request-noninteractive' can be used
381 to specify that we're running in a noninteractive context, and that
382 we should not be queried about things like TLS certificate validity.
384 *** If URL is used with a https connection, the first callback argument
385 plist will contain a :peer element that has the output of
386 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
390 *** New connection method "nc", which allows to access dumb busyboxes.
394 *** New user variable `sql-default-directory' enables remote
395 connections using Tramp.
397 *** New command `sql-send-line-and-next' sends the current line to the
398 interactive buffer and advances to the next line, skipping whitespace
401 *** Add support for Vertica SQL.
403 ** VC and related modes
405 *** The new command vc-region-history shows the log+diff of the active region.
407 *** New option `vc-annotate-background-mode' controls whether
408 the color range from `vc-annotate-color-map' is applied to the
409 background or to the foreground.
411 *** `compare-windows' now compares text with the most recently used window
412 instead of the next window. The new option `compare-windows-get-window-function'
413 allows to customize this.
415 *** Two new faces `compare-windows-removed' and `compare-windows-added'
416 replace the obsolete face `compare-windows'.
418 ** Calculator: decimal display mode uses "," groups, so it's more
419 fitting for use in money calculations; factorial works with
422 ** HideIfDef mode now support full C/C++ expressions, argumented macro expansions
423 , interactive macro evaluation and automatic scanning of #defined symbols.
425 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header file
426 name patterns. Default case-insensitive .h, .hh, .hpp and .hxx.
427 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
428 reinclusion protected header files from being fully hidden.
429 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
430 name patterns (e.x. all "FOR_DOXYGEN_ONLY_*") to be excluded.
434 *** New custom variable `tex-print-file-extension' to help users who
435 use PDF instead of DVI.
437 ** whitespace-mode: new 'big-indent style highlighting too much indentation.
438 By default, 32 spaces and four TABs are considered to be too much but
439 `whitespace-big-indent-regexp' can be configured to change that.
441 ** tildify: `tildify-space-string', `tildify-pattern', and
442 `tildify-foreach-region-function' variables added making
443 `tildify-string-alist', `tildify-pattern-alist', and
444 `tildify-ignored-environments-alist' variables (as well as a few
445 helper functions) obsolete.
448 The new package provides generic framework and new commands to find
449 and move to definitions, as well as pop back to the original location.
452 `xref-find-definitions' replaces `find-tag' and provides an interface
453 to pick one destination among several. Hence, `tags-loop-continue' is
454 unbound. `xref-pop-marker-stack' replaces `pop-tag-mark', but uses an
455 easier binding, which is now unoccupied (`M-,').
456 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
457 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
458 `xref-find-apropos' replaces `find-tag-regexp'.
461 `find-tag-marker-ring-length' is now an obsolete alias for
462 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
463 alias for a private variable. `xref-push-marker-stack' and
464 `xref-pop-marker-stack' should be used to mutate it instead.
467 As a result of the above, these commands are now obsolete:
468 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
469 `tags-apropos' and `tags-loop-continue'.
477 * New Modes and Packages in Emacs 25.1
479 ** scss-mode (a minor variant of css-mode)
481 ** let-alist is a new macro (and a package) that allows one to easily
482 let-bind the values stored in an alist.
485 * Incompatible Lisp Changes in Emacs 25.1
487 ** completion-table-dynamic stays in the minibuffer.
488 If you want the old behavior of calling the function in the buffer
489 from which the minibuffer was entered, call it with the new argument
492 ** window-configurations no longer record the buffers's marks.
494 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
495 active region handling.
497 ** deactivate-mark is now buffer-local.
499 ** `cl-the' now asserts that its argument is of the given type.
502 ** Mouse click events on mode line or header line no longer include
503 any reference to a buffer position. The 6th member of the mouse
504 position list returned for such events is now nil.
506 ** Menu items in keymaps do not support the "key shortcut cache" any more.
507 These slots used to hold key-shortcut data, but have been obsolete since
511 * Lisp Changes in Emacs 25.1
513 ** define-inline provides a new way to define inlinable functions.
515 ** New function macroexpand-1 to perform a single step of macroexpansion.
517 ** Some "x-*" were obsoleted:
518 *** x-select-text is renamed gui-select-text.
519 *** x-selection-value is renamed gui-selection-value.
520 *** x-get-selection is renamed gui-get-selection.
521 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
522 *** x-get-selection-value is renamed to gui-get-primary-selection.
523 *** x-set-selection is renamed to gui-set-selection
525 ** New function `alist-get', which is also a valid place (aka lvalue).
527 ** New function `funcall-interactively', which works like `funcall'
528 but makes `called-interactively-p' treat the function as (you guessed it)
529 called interactively.
531 ** New function `function-put' to use instead of `put' for function properties.
534 ** New properties that can be specified with `declare':
535 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
536 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
537 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
541 ** New macro `with-file-modes', for evaluating expressions with default file
542 permissions set to temporary values (e.g., for creating private files).
544 ** You can access the slots of structures using `cl-struct-slot-value'.
546 ** Functions `rmail-delete-forward' and `rmail-delete-backward' take an
547 optional repeat-count argument.
549 ** Function `sort' can deal with vectors.
551 ** Function `system-name' now returns an updated value if the current
552 system's name has changed or if the Emacs process has changed systems,
553 and to avoid long waits it no longer consults DNS to canonicalize the
554 name. The variable `system-name' is now obsolete.
557 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
560 ** New utilities in subr-x.el:
561 *** New macros `if-let' and `when-let' allow defining bindings and to
562 execute code depending whether all values are true.
563 *** New macros `thread-first' and `thread-last' allow threading a form
564 as the first or last argument of subsequent forms.
567 ** Time-related changes:
569 *** Time-related functions now consistently accept numbers
570 (representing seconds since the epoch) and nil (representing the
571 current time) as well as the usual list-of-integer representation.
572 Affected functions include `current-time-string', `current-time-zone',
573 `decode-time', `float-time', `format-time-string', `seconds-to-time',
574 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
575 `time-to-days', and `time-to-seconds'.
577 *** The `encode-time-value' and `with-decoded-time-value' macros have
580 *** `calendar-next-time-zone-transition', `time-add', and
581 `time-subtract' no longer return time values in the obsolete and
582 undocumented integer-pair format. Instead, they return a list of two
586 * Changes in Frames and Windows Code in Emacs 25.1
589 ** Emacs can now draw horizontal scroll bars on some platforms that
590 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
591 Horizontal scroll bars are turned off by default.
592 *** New function `horizontal-scroll-bars-available-p' telling whether
593 horizontal scroll bars are available on the underlying system.
594 *** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
595 bars on all existing and future frames.
596 *** New function `toggle-horizontal-scroll-bar' to toggle horizontal
597 scroll bars on the selected frame.
598 *** New frame parameters `horizontal-scroll-bars' and
599 `scroll-bar-height' to set horizontal scroll bars and their height
600 for individual frames and in `default-frame-alist'.
601 *** New functions `frame-scroll-bar-height' and
602 `window-scroll-bar-height' return the height of horizontal scroll
603 bars on a specific frame or window.
604 *** `set-window-scroll-bars' now accepts five parameters where the last
605 two specify height and type of the window's horizontal scroll bar.
606 *** `window-scroll-bars' now returns type and sizes of horizontal scroll
608 *** New buffer-local variables `horizontal-scroll-bar' and
612 ** The height of a frame's menu and tool bar are no more counted in the
613 frame's text height. This means that the text height stands only for
614 the height of the frame's root window plus that of the echo area (if
615 present). This was already the behavior for frames with external tool
616 and menu bars (like in the Gtk builds) but has now been extended to all
620 ** Frames now do not necessarily preserve the number of columns or lines
621 they display when setting default font, menu bar, fringe width, or
622 scroll bars. In particular, maximized and fullscreen frames are
623 conceptually never resized if such settings change. For fullheight and
624 fullwidth frames, the behavior may depend on the toolkit used.
625 *** New option `frame-inhibit-implied-resize' if non-nil, means that
626 setting default font, menu bar, fringe width, or scroll bars of a
627 specific frame does not resize that frame in order to preserve the
628 number of columns or lines it displays.
631 ** New function `window-preserve-size' allows to preserve the size of
632 windows without "fixing" it. It's supported by `fit-window-to-buffer',
633 `temp-buffer-resize-mode' and `display-buffer'.
635 ** Tearoff menus and detachable toolbars for Gtk+ has been removed.
636 Those features have been deprecated in Gtk+ for a long time.
639 * Changes in Emacs 25.1 on Non-Free Operating Systems
642 ** Building Emacs for MS-Windows requires at least Windows XP
643 or Windows Server 2003. The built binaries still run on all versions
644 of Windows starting with Windows 9X.
646 ** OS X 10.5 or older is no longer supported.
648 ** OS X on PowerPC is no longer supported.
651 ----------------------------------------------------------------------
652 This file is part of GNU Emacs.
654 GNU Emacs is free software: you can redistribute it and/or modify
655 it under the terms of the GNU General Public License as published by
656 the Free Software Foundation, either version 3 of the License, or
657 (at your option) any later version.
659 GNU Emacs is distributed in the hope that it will be useful,
660 but WITHOUT ANY WARRANTY; without even the implied warranty of
661 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
662 GNU General Public License for more details.
664 You should have received a copy of the GNU General Public License
665 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
671 paragraph-separate: "[
\f]*$"