1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2014-2016 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 If possible, use M-x report-emacs-bug.
9 This file is about changes in Emacs version 25.
11 See file HISTORY for a list of GNU Emacs versions and release dates.
12 See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
13 and NEWS.1-17 for changes in older Emacs versions.
15 You can narrow news to a specific version by calling `view-emacs-news'
16 with a prefix argument or by typing C-u C-h C-n.
19 +++ indicates that all necessary documentation updates are complete.
20 (This means all relevant manuals in doc/ AND lisp doc-strings.)
21 --- means no change in the manuals is needed.
22 When you add a new item, use the appropriate mark if you are sure it applies,
23 otherwise leave it unmarked.
26 * Installation Changes in Emacs 25.1
29 ** Building Emacs now requires C99 or later.
32 ** Building Emacs now requires GNU make, version 3.81 or later.
35 ** New configure option --with-cairo.
36 This builds Emacs with Cairo drawing. As a side effect, it provides
37 support for built-in printing, when Emacs was built with GTK+.
39 ** New configure option --with-modules.
40 This enables support for loading dynamic modules; see below.
43 ** By default, Emacs no longer works on IRIX. We expect that Emacs
44 users are not affected by this, as SGI stopped supporting IRIX in
45 December 2013. If you are affected, please send a bug report. You
46 should be able to work around the problem either by porting the Emacs
47 undumping code to GCC under IRIX, or by configuring --with-wide-int,
48 or by sticking with Emacs 24.4.
51 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
52 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
53 since Emacs 24.4, and the other variants were undocumented and were
54 obstacles to maintenance and development. GC_MARK_STACK and its
55 related symbols have been removed from the C internals.
58 ** 'configure' now prefers gnustep-config when configuring GNUstep.
59 If gnustep-config is not available, the old heuristics are used.
62 ** 'configure' now prefers inotify to gfile for file notification,
63 unless gfile is explicitly requested via --with-file-notification='gfile'.
66 ** The configure option '--with-pkg-config-prog' has been removed.
67 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
70 ** The configure option '--with-mmdf' has been removed.
71 It was no longer useful, as it relied on libraries that are no longer
72 supported, and its presence led to confusion during configuration.
73 This affects only the 'movemail' utility; Emacs itself can still
74 process MMDF-format files as before.
77 ** The configure option '--enable-silent-rules' is now the default,
78 and silent rules are now quieter. To get the old behavior where
79 'make' chatters a lot, configure with '--disable-silent-rules' or
80 build with 'make V=1'.
83 ** The configure option '--with-gameuser' now allows to specify a
84 group instead of a user if its argument is prefixed by ':' (a colon).
85 This will cause the game score files in ${localstatedir}/games/emacs
86 to be owned by that group, and the helper program for updating them to
87 be installed setgid. The option now defaults to the 'games' group.
90 ** The `grep-changelog' script (and its manual page) are no longer included.
91 It has no particular connection to Emacs and has not changed in years,
92 so if you want to use it, you can always take a copy from an older Emacs.
95 ** Emacs 25 comes with a new set of icons.
96 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
97 The old Emacs logo icons are available as `emacs23.png' in the same location.
100 ** New make target `check-expensive' to run additional tests.
101 This includes all tests which run via "make check", plus additional
102 tests which take more time to perform.
105 * Startup Changes in Emacs 25.1
108 ** When Emacs is given a file as a command line argument and
109 `initial-buffer-choice' is non-nil, display both the file and
110 `initial-buffer-choice'. When Emacs is given more than one file and
111 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
112 and *Buffer List*. This makes Emacs convenient to use from the
113 command line when `initial-buffer-choice' is non-nil.
116 ** The value of ‘initial-scratch-message’ is now treated as a doc string
117 and can contain escape sequences for command keys, quotes, and the like.
120 * Changes in Emacs 25.1
122 ** Emacs can now load shared/dynamic libraries (modules).
123 A dynamic Emacs module is a shared library that provides additional
124 functionality for use in Emacs Lisp programs, just like a package
125 written in Emacs Lisp would. The functions `load', `require',
126 `load-file', etc. were extended to load such modules, as they do with
127 Emacs Lisp packages. The new variable `module-file-suffix' holds the
128 system-dependent value of the file-name extension (`.so' on Posix
129 hosts) of the module files.
131 A module should export a C-callable function named
132 `emacs_module_init', which Emacs will call as part of the call to
133 `load' or `require' which loads the module. It should also export a
134 symbol named `plugin_is_GPL_compatible' to indicate that its code is
135 released under the GPL or compatible license; Emacs will refuse to
136 load modules that don't export such a symbol.
138 If a module needs to call Emacs functions, it should do so through the
139 API defined and documented in the header file `emacs-module.h'. Note
140 that any module that provides Lisp-callable functions will have to use
141 Emacs functions such as `fset' and `funcall', in order to register its
142 functions with the Emacs Lisp interpreter.
144 Modules can create `user-ptr' Lisp objects that embed pointers to C
145 struct's defined by the module. This is useful for keeping around
146 complex data structures created by a module, to be passed back to the
147 module's functions. User-ptr objects can also have associated
148 "finalizers" -- functions to be run when the object is GC'ed; this is
149 useful for freeing any resources allocated for the underlying data
150 structure, such as memory, open file descriptors, etc. A new
151 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
154 Loadable modules in Emacs are an experimental feature, and subject to
155 change in future releases. For that reason, their support is disabled
156 by default, and must be enabled by using the `--with-modules' option
160 ** Any file of the form .dir-locals*.el is now considered a dir-local
161 file, and multiple such files can be used in the same directory. See
162 the variable `dir-locals-file' for more information.
165 ** Network security (TLS/SSL certificate validity and the like) is
166 added via the new Network Security Manager (NSM) and controlled via
167 the `network-security-level' variable.
169 ** If Emacs isn't built with TLS support, an external TLS-capable
170 program is used instead. This program used to be run in --insecure
171 mode by default, but has now changed to be secure instead, and will
172 fail if you try to connect to non-verifiable hosts. This is
173 controlled by the `tls-program' variable.
176 ** C-h l now also lists the commands that were run.
179 ** x-select-enable-clipboard is renamed select-enable-clipboard
180 and x-select-enable-primary is renamed select-enable-primary.
181 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
182 name it), with the proviso that on some systems (e.g. Windows)
183 select-enable-primary is ineffective since the system doesn't
184 have the equivalent of a primary selection.
187 ** New option `switch-to-buffer-in-dedicated-window' allows to customize
188 how `switch-to-buffer' proceeds interactively when the selected window
189 is strongly dedicated to its buffer.
192 ** The option `even-window-heights' has been renamed to
193 `even-window-sizes' and now handles window widths as well.
196 ** terpri gets an optional arg ENSURE to conditionally output a newline.
199 ** `insert-register' now leaves point after the inserted text
200 when called interactively. A prefix argument toggles this behavior.
203 ** The new variable `term-file-aliases' replaces some files from lisp/term.
204 The function `tty-run-terminal-initialization' consults this variable
205 when deciding what terminal-specific initialization code to run.
208 ** New variable `system-configuration-features', listing some of the
209 main features that Emacs was compiled with. This is mainly intended
210 for use in Emacs bug reports.
213 ** A password is now hidden also when typed in batch mode. Another
214 hiding character but the default `.' can be used by let-binding the
215 variable `read-hide-char'.
218 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
221 * Editing Changes in Emacs 25.1
224 ** M-x suggests shorthands and ignores obsolete commands for completion.
229 *** Successive single-char deletions are collapsed in the undo-log just like
230 successive char insertions. Which commands invoke this behavior is
231 controlled by the new `undo-auto-amalgamate' function. See the node
232 "Undo" in the ELisp manual for more details.
235 *** The heuristic used to insert `undo-boundary' after each command
236 has changed, so that if a command causes changes in more than just the
237 current buffer, Emacs now calls `undo-boundary' in every buffer
238 affected by the command.
241 ** New command `comment-line' bound to `C-x C-;'.
243 ** New and improved facilities for inserting Unicode characters
246 *** Unicode names entered via C-x 8 RET now use substring completion by default.
249 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
250 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
253 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
254 as you type. See also the new variable ‘text-quoting-style’.
257 ** New minor mode global-eldoc-mode is enabled by default.
260 ** Emacs now supports "bracketed paste mode" when running on a terminal
261 that supports it. This facility allows Emacs to understand pasted
262 chunks of text as strings to be inserted, instead of interpreting each
263 character in the pasted text as actual user input. This results in a
264 paste experience similar to that under a window system, and significant
265 performance improvements when pasting large amounts of text.
268 ** Emacs now supports the latest version of the UBA.
269 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
270 was updated to support all the latest additions and changes introduced
271 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
272 This includes full support for directional isolates and the
273 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
277 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
280 ** New buffer-local `electric-pair-local-mode'.
283 ** New variable `fast-but-imprecise-scrolling' inhibits
284 fontification during full screen scrolling operations, giving less
285 hesitant operation during auto-repeat of C-v, M-v at the cost of
286 possible inaccuracies in the end position.
289 ** New documentation command `describe-symbol'.
290 Works for functions, variables, faces, etc. It is bound to `C-h o' by
294 ** New function `custom-prompt-customize-unsaved-options' checks for
295 unsaved customizations and prompts user to customize (if found). It
296 is intended for adding to 'kill-emacs-query-functions'.
299 * Changes in Specialized Modes and Packages in Emacs 25.1
304 *** New command `checkdoc-package-keywords' checks if the
305 current package keywords are recognized. Set the new option
306 `checkdoc-package-keywords-flag' to non-nil to make
307 `checkdoc-current-buffer' call this function automatically.
310 *** New function `checkdoc-file' checks for style errors.
311 It's meant for use together with `compile':
312 emacs -batch --eval "(checkdoc-file \"subr.el\")"
315 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
316 It raises an error if a bookmark of that name already exists,
317 unlike `bookmark-set' which silently updates an existing bookmark.
322 *** `imap-ssl-program' has been removed, and imap.el uses the internal
323 GnuTLS encryption functions if possible.
328 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
329 the ordering of object keys by default.
332 *** New commands `json-pretty-print-ordered' and
333 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
334 object keys sorted alphabetically.
337 ** Prog mode has some support for multi-mode indentation.
338 This allows better indentation support in modes that support multiple
339 programming languages in the same buffer, like literate programming
340 environments or ANTLR programs with embedded Python code.
342 A major mode can provide indentation context for a sub-mode through
343 the `prog-indentation-context' variable. To support this, modes that
344 provide indentation should use `prog-widen' instead of `widen' and
345 `prog-first-column' instead of a literal zero. See the node
346 "Mode-Specific Indent" in the ELisp manual for more details.
348 ** Prettify Symbols mode
351 *** Prettify Symbols mode supports custom composition predicates. By
352 overriding the default `prettify-symbols-compose-predicate', modes can
353 specify in which contexts a symbol may be displayed as some Unicode
354 character. `prettify-symbols-default-compose-p' is the default which
355 is suitable for most programming languages such as C or Lisp (but not
359 *** Symbols can be unprettified while point is inside them.
360 New variable `prettify-symbols-unprettify-at-point' configures this.
362 ** Enhanced xterm support
365 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
366 This variable tells Emacs which advanced capabilities are available in
367 the xterm terminal emulator used to display Emacs text-mode frames.
368 The default is to check each capability, and use it if available.
369 (This variable was introduced in Emacs 24.1, but was not announced in
373 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
374 in the surrounding GUI (using the OSC-52 escape sequence). This only works
375 if your xterm supports it and enables the `allowWindowOps' options (disabled
376 by default at least in Debian, for security reasons).
378 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
379 escape sequence) if your xterm has the feature enabled but for that you
380 additionally need to add `getSelection' to `xterm-extra-capabilities'.
383 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
386 ** The `save-place' variable is replaced by `save-place-mode'.
391 *** ERC can now hide message types by network or channel.
392 `erc-hide-list' will hide all messages of the specified type, while
393 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
394 specified message types for the respective specified targets.
399 *** `midnight-mode' is now a proper minor mode.
402 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
407 *** New "external" package status.
408 An external package is any installed package that's not built-in and
409 not from `package-user-dir', which usually means it's from an entry in
410 `package-directory-list'. They are treated much like built-in
411 packages, in that they cannot be deleted through the package menu and
412 are not considered for upgrades.
414 The effect is that a user can manually place a specific version of a
415 package inside `package-directory-list' and the package menu will
419 *** If a package is available on multiple archives and one has higher
420 priority (as per `package-archive-priorities') only that one is
421 listed. This can be configured with `package-menu-hide-low-priority'.
424 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
425 This includes the above-mentioned low-priority packages, as well as
426 available packages whose version is lower than the currently installed
427 version (which were previously impossible to display).
428 This allows users to downgrade a package if a lower version is
432 *** When filtering the package menu, keywords starting with "arc:" or
433 "status:" represent package archive or status, respectively, instead
437 *** Most functions which involve downloading information now take an
438 ASYNC argument. If it is non-nil, package.el performs the download(s)
442 *** New variable `package-menu-async' controls whether the
443 package-menu uses asynchronous downloads.
446 *** `package-install-from-buffer' and `package-install-file' work on directories.
447 This follows the same rules as installing from a .tar file, except the
448 -pkg file is optional.
451 *** Packages which are dependencies of other packages cannot be deleted.
452 The FORCE argument to `package-delete' overrides this.
455 *** New custom variable `package-selected-packages' tracks packages
456 which were installed by the user (as opposed to installed as
457 dependencies). This variable can also be manually customized.
460 *** New command `package-install-user-selected-packages' installs all
461 packages from `package-selected-packages' which are currently missing.
464 *** New command `package-autoremove' removes all packages which were
465 installed strictly as dependencies but are no longer needed.
470 When you invoke `shell' interactively, the *shell* buffer will now
471 display in a new window. However, you can customize this behavior via
472 the `display-buffer-alist' variable. For example, to get
473 the old behavior -- *shell* buffer displays in current window -- use
474 (add-to-list 'display-buffer-alist
475 '("^\\*shell\\*$" . (display-buffer-same-window))).
479 *** The `:protection' slot option is not obeyed any more.
481 *** The `newname' argument to constructors is optional&deprecated.
482 If you need your objects to be named, do it by inheriting from `eieio-named'.
484 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
486 *** The <class> variables are declared obsolete.
488 *** The <initarg> variables are declared obsolete.
489 *** defgeneric and defmethod are declared obsolete.
491 *** `constructor' is now an obsolete alias for `make-instance'.
496 *** New command `ido-bury-buffer-at-head' bound to C-S-b
497 Bury the buffer at the head of `ido-matches', analogous to how C-k
498 kills the buffer at head.
501 *** A prefix argument to `ido-restrict-to-matches' will reverse its
502 meaning, and the list is restricted to those elements that do not
503 match the current input.
508 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
509 The new commands `next-line-or-history-element' and
510 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
511 minibuffer, allow by-line movement through minibuffer history,
512 similarly to an ordinary buffer. Only when point moves over
513 the bottom/top of the minibuffer it goes to the next/previous history
514 element. `M-p' and `M-n' still move directly to previous/next history
517 ** Search and Replace
520 *** New user option `search-default-regexp-mode'
521 specifies the default mode for I-search.
524 *** `isearch' and `query-replace' can now perform character folding in matches.
525 Isearch does that by default, while `query-replace' will do that if
526 the new variable `replace-character-fold' is customized to a non-nil
527 value. This is analogous to case folding, but instead of disregarding
528 case variants, it disregards wider classes of distinctions between
529 similar characters. (Case folding is a special case of character
530 folding.) This means many characters in the search string will match
531 entire groups of characters instead of just themselves.
533 For instance, the " will match all variants of double quotes (like “
534 and ”), and the letter a will match all of its accented cousins, even
535 those composed of multiple characters, as well as many other symbols
539 *** New function `character-fold-to-regexp' can be used
540 by searching commands to produce a regexp matching anything that
541 character-folds into STRING.
544 *** The new M-s M-w key binding uses eww to search the web for the
545 text in the region. The search engine to use for this is specified by
546 the customizable variable `eww-search-prefix'.
549 *** Query-replace history is enhanced.
550 When query-replace reads the FROM string from the minibuffer, typing
551 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
552 and TO are the original text and its replacement, and SEP is an arrow
553 string defined by the new variable `query-replace-from-to-separator'.
554 To select a prior replacement, type `M-p' until the desired
555 replacement appears in the minibuffer, and then exit the minibuffer by
560 *** If `quick-calc' is called with a prefix argument, insert the
561 result of the calculation into the current buffer.
564 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
565 this you can tell Edebug not to stop at the start of the first
566 instrumented function.
571 *** New minor mode `global-eldoc-mode'
572 It is turned on by default, and affects `*scratch*' and other buffers
573 whose major mode supports Emacs Lisp.
576 *** `eldoc-documentation-function' now defaults to `ignore'
579 *** `describe-char-eldoc' displays information about character at point,
580 and can be used as a default value of `eldoc-documentation-function'. It is
581 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
582 ] [, ] [, etc.) while using mono-spaced font.
587 *** HTML can now be rendered using variable-width fonts.
590 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
591 whether to use variable-pitch fonts or not. The user can also
592 customize the `shr-use-fonts' variable.
595 *** A new command `R' (`eww-readable') will try do identify the main
596 textual parts of a web page and display only that, leaving menus and
597 the like off the page.
600 *** You can now use several eww buffers in parallel by renaming eww
601 buffers you want to keep separate.
604 *** Partial state of the eww buffers (the URIs and the titles of the
605 pages visited) is now preserved in the desktop file.
608 *** `eww-after-render-hook' is now called after eww has rendered
609 the data in the buffer.
612 *** The `eww-reload' command now takes a prefix to not reload via
613 the net, but just use the local copy of the HTML.
616 *** The DOM shr and eww uses has been changed to the general Emacs
617 xml.el/libxml2 DOM, and a new package dom.el has been added to
618 interact with this DOM. See the Emacs Lisp manual for interface
622 *** `mailcap-mime-data' is now consulted when displaying PDF files.
625 *** The new `S' command will list all eww buffers, and allow managing
629 *** https pages with valid certificates have headers marked in green, while
630 invalid certificates are marked in red.
635 *** text/html messages that contain inline image parts will be
636 transformed into multipart/related messages before sending.
639 ** In Show Paren Mode, a parenthesis can be highlighted when point
640 stands inside it, and certain parens can be highlighted when point is
641 at BOL or EOL, or in whitespace there. To enable these, customize,
642 respectively, `show-paren-when-point-inside-paren' or
643 `show-paren-when-point-in-periphery'.
648 *** Strings after `:documentation' are highlighted as docstrings.
649 This enhances Lisp mode fontification to handle documentation of the
650 form `(:documentation "the doc string")' used in Common Lisp code for
651 CLOS class and slot documentation.
656 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
659 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
660 *** `string-rectangle' provides on-the-fly preview of the result.
663 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
664 These should be used in preference to `font-lock-fontify-buffer' when
668 ** Macro `minibuffer-with-setup-hook' can optionally append a function
669 to `minibuffer-setup-hook'.
671 If the first argument of the macro is of the form `(:append FUN)',
672 then FUN will be appended to `minibuffer-setup-hook', instead of
677 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
679 ** Calendar and diary
682 *** The default `diary-file' is now located in .emacs.d.
685 *** New commands to insert diary entries with Chinese dates:
686 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
687 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
690 *** The calendar can now list and mark diary entries with Chinese dates.
691 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
694 *** The option `calendar-mode-line-format' can now be nil,
695 which means to do nothing special with the mode line in calendars.
698 *** New option `calendar-weekend-days'.
699 The option customizes which day headers receive the
700 `calendar-weekend-header' face.
703 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
706 *** Many items obsolete since at least version 23.1 have been removed.
707 The majority were function/variable/face aliases, too numerous to list here.
710 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
711 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
713 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
715 **** Macro `calendar-for-loop'.
717 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
719 **** The nil and list forms of `diary-display-function'.
722 ** New ERT function `ert-summarize-tests-batch-and-exit'.
723 If the output of ERT tests in batch mode execution can be saved to a
724 log file, then it can be passed as an argument to the above function
725 to produce a neat summary.
727 ** New js.el option `js-indent-first-init'.
732 ** Info mode now displays symbol names in fixed-pitch font.
733 If you want to get the old behavior back, customize the `Info-quoted'
734 face to use the same definitions as the default face.
737 *** `Info-fontify-maximum-menu-size' can be t for no limit.
740 *** `info-display-manual' can now be given a prefix argument which (any
741 non-nil value) directs the command to limit the completion
742 alternatives to currently visited manuals.
745 ** ntlm.el has support for NTLM2.
750 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
751 to delete or undelete multiple messages.
754 *** Rmail can now render HTML mail messages if your Emacs was built with
755 libxml2 or if you have the Lynx browser installed. By default, Rmail
756 will display the HTML version of a mail message that has both HTML and
757 plain text parts, if display of HTML email is possible; customize the
758 `rmail-mime-prefer-html' option to `nil' if you don't want that.
761 *** In the commands that make summaries by subject, recipients, or senders,
762 you can no longer use commas to separate regular expressions.
765 ** SES now supports local printer functions; see `ses-define-local-printer'.
769 *** In sh-mode you can now use `sh-shell' as a file-local variable to
770 specify the type of shell in use (bash, csh, etc).
773 *** New value `always' for `sh-indent-after-continuation'.
774 This provides old-style ("dumb") indentation of continued lines.
775 See the doc string of `sh-indent-after-continuation' for details.
779 *** Fatal TLS errors are now silent by default.
784 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
785 When `url-handler-mode' is enabled, file operations for these
786 protocols as well as for "telnet" and "ftp" are passed to Tramp.
789 *** The URL package allows customizing the `url-user-agent' string.
790 The new `url-user-agent' variable can be customized to be a string or
794 *** The new interface variable `url-request-noninteractive' can be used
795 to specify that we're running in a noninteractive context, and that
796 we should not be queried about things like TLS certificate validity.
799 *** If URL is used with a https connection, the first callback argument
800 plist will contain a :peer element that has the output of
801 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
806 *** New connection method "afp", which allows to access Mac OS X
807 volumes via the Apple Filing Protocol.
810 *** New connection method "nc", which allows to access dumb busyboxes.
813 *** Method-specific parameters can be overwritten now with variable
814 `tramp-connection-properties'.
817 *** Handler for `file-notify-valid-p' for remote machines that support
818 filesystem notifications.
823 *** New user variable `sql-default-directory' enables remote
824 connections using Tramp.
827 *** New command `sql-send-line-and-next'.
828 This command, bound to `C-c C-n' by default, sends the current line to
829 the SQL process and advances to the next line, skipping whitespace and
833 *** Added support for Vertica SQL.
835 ** VC and related modes
838 *** Basic push support, via `vc-push', bound to `C-x v P'.
839 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
840 (undocumented) command vc-hg-push now behaves slightly differently.
843 *** The new command vc-region-history shows the log+diff of the active region.
846 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
847 This command is useful when you perform version control commands
848 outside Emacs (e.g., from the shell prompt), or if you switch the VC
849 back-end for the buffer's file, or remove it from version control.
852 *** New option `vc-annotate-background-mode' controls whether
853 the color range from `vc-annotate-color-map' is applied to the
854 background or to the foreground.
857 *** `compare-windows' now compares text with the most recently selected window
858 instead of the next window. If you want the previous behavior of
859 comparing with the next window, customize the new option
860 `compare-windows-get-window-function' to the value
861 `compare-windows-get-next-window'.
864 *** Two new faces `compare-windows-removed' and `compare-windows-added'
865 replace the face `compare-windows', which is now an obsolete alias for
866 `compare-windows-added'.
869 *** `log-edit-insert-changelog' converts "(tiny change)" to
870 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
874 ** VHDL mode now supports VHDL'08.
879 *** Decimal display mode uses "," groups, so it's more
880 fitting for use in money calculations
883 *** Factorial works with non-integer inputs.
888 *** Hide-IfDef mode now support full C/C++ expressions in macros,
889 macro argument expansion, interactive macro evaluation and automatic
890 scanning of #define'd symbols.
893 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
894 result of evaluating a macro.
897 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
898 all defined symbols in `hide-ifdef-env'.
901 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
902 file name patterns. Defaults to files whose extension is one of `.h',
903 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
906 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
907 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
908 (This could happen when an idempotent header file is visited again,
909 when its guard symbol is already defined.) Defaults to `t'.
912 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
913 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
914 looking for macro definitions. By default, no symbols are ignored.
919 *** New custom variable `tex-print-file-extension' to help users who
920 use PDF instead of DVI.
923 *** TeX mode now supports Prettify Symbols mode. When enabling
924 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
925 many other math macros are displayed using unicode characters.
928 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
929 By default, 32 consecutive spaces or four consecutive TABs are
930 considered to be too deep, but the new variable
931 `whitespace-big-indent-regexp' can be customized to change that.
934 ** New options in `tildify-mode'.
935 New options `tildify-space-string', `tildify-pattern', and
936 `tildify-foreach-region-function' variables make
937 `tildify-string-alist', `tildify-pattern-alist', and
938 `tildify-ignored-environments-alist' variables (as well as a few
939 helper functions) obsolete.
942 ** New package Xref replaces Etags's front-end and UI
944 The new package Xref provides a generic framework and new commands to
945 find and move to definitions of functions, macros, data structures
946 etc., as well as go back to the location where you were before moving
947 to a definition. It supersedes and obsoletes many Etags commands,
948 while still using the etags.el code that reads the TAGS tables as one
951 The command `xref-find-definitions' replaces `find-tag' and provides
952 an interface to pick one definition among several.
953 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
954 `pop-tag-mark', but has a keybinding (`M-,'), unlike `pop-tag-mark'.
956 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
957 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
958 `xref-find-apropos' replaces `find-tag-regexp'.
960 As a result of this, the following commands are now obsolete:
961 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
962 `tags-apropos', and `tags-loop-continue'.
967 `find-tag-marker-ring-length' is now an obsolete alias for
968 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
969 alias for a private variable. `xref-push-marker-stack' and
970 `xref-pop-marker-stack' should be used instead to manipulate the stack
971 of searches for definitions.
974 *** `xref-find-definitions' and `describe-function' now display
975 information about mode local overrides (defined by cedet/mode-local.el
976 `define-overloadable-function' `define-mode-local-overrides').
978 The framework's Lisp API is still experimental and can change in major,
979 backward-incompatible ways.
982 ** New package Project
984 The new package Project provides generic infrastructure for dealing
985 with projects. The main commands included in it are
986 `project-find-file' and `project-find-regexp'.
988 The Lisp API of this package is still experimental.
991 EUDC's LDAP backend has been improved.
994 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
997 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
998 subprocess instead of on the command line.
1001 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1002 need to configure this manually anymore.
1005 *** The LDAP configuration section of EUDC's manual has been
1008 There have also been customization changes.
1011 *** New custom variable `eudc-server-hotlist' to allow specifying
1012 multiple EUDC servers in init file.
1015 *** Custom variable `eudc-inline-query-format' defaults to completing
1016 on email and firstname instead of surname.
1019 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1020 to avoid interfering with the kill ring.
1023 *** Custom variable `eudc-inline-expansion-format' defaults to
1024 "Firstname Surname <mail-address>".
1027 *** Custom variable `eudc-options-file' defaults to
1028 "~/.emacs.d/eudc-options".
1031 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1032 allow overriding the regular expression that recognizes the ldapsearch
1033 command line's password prompt.
1036 EUDC's BBDB backend now supports BBDB 3.
1039 EUDC's PH backend (eudcb-ph.el) is obsolete.
1044 *** The new built-in command `clear' can scroll window contents out of sight.
1045 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1048 *** New buffer syntax '#<buffer-name>', which is equivalent to
1049 '#<buffer buffer-name>'. This shorthand makes interacting with
1050 buffers from eshell more convenient. Custom variable
1051 `eshell-buffer-shorthand', which has been broken for a while, has been
1055 *** By default, eshell "visual" program buffers (created by
1056 `eshell-visual-commands' and similar custom vars) are no longer killed
1057 when their processes die. This fixes issues with short-lived commands
1058 and makes visual programs more useful in general. For example, if
1059 "git log" is a visual command, it will always show the visual command
1060 buffer, even if the "git log" process dies. For the old behavior,
1061 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1065 *** Support for the Conkeror web browser.
1068 *** Support for several ancient browsers is now officially obsolete.
1071 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1072 be added to the archive.
1075 ** Autorevert: dired buffers are also auto-reverted via file
1076 notifications, if Emacs is compiled with file notification support.
1078 ** File Notifications
1081 *** The new event `stopped' signals, that a file notification watch is
1082 not active any longer.
1085 *** The new function `file-notify-valid-p' checks, whether a file
1086 notification descriptor still corresponds to an activate watch.
1091 *** The command `dired-do-compress' bound to `Z' now can compress
1092 directories and decompress zip files.
1095 *** New command `dired-do-compress-to' bound to `c' can be used to
1096 compress many marked files into a single named archive. The
1097 compression command is determined from the new
1098 `dired-compress-files-alist' variable.
1100 ** Tabulated List Mode
1103 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1104 call `tabulated-list-init-header', in which case it will have no
1108 *** `tabulated-list-print' takes a second optional argument, update,
1109 which specifies an alternative printing method which is faster when
1110 few or no entries have changed.
1112 ** Obsolete packages
1117 *** landmark.el (moved to elpa.gnu.org)
1120 * New Modes and Packages in Emacs 25.1
1122 ** pinentry.el allows GnuPG passphrase to be prompted through the
1123 minibuffer instead of a graphical dialog, depending on whether the gpg
1124 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1125 is set). This feature requires newer versions of GnuPG (2.1.5 or
1126 later) and Pinentry (0.9.5 or later).
1128 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1130 ** scss-mode (a minor variant of css-mode)
1132 ** let-alist is a new macro (and a package) that allows one to easily
1133 let-bind the values stored in an alist.
1135 ** `tildify-mode' allows to automatically insert hard spaces as one
1136 types the text. Breaking line after a single-character words is
1137 forbidden by Czech and Polish typography (and may be discouraged in
1138 other languages), so `auto-tildify-mode' makes it easier to create
1139 a typographically-correct documents.
1141 ** The `seq' library adds sequence manipulation functions and macros
1142 that complement basic functions provided by subr.el. All functions
1143 are prefixed with `seq-' and work on lists, strings and vectors.
1145 ** The `map' library provides map-manipulation functions that work on
1146 alists, hash-table and arrays. All functions are prefixed with
1149 ** The `thunk' library provides functions and macros to control the
1150 evaluation of forms.
1152 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1153 support for JSX, an XML-like syntax extension to ECMAScript.
1156 * Incompatible Lisp Changes in Emacs 25.1
1159 ** `setq' and `setf' must now be called with an even number of
1160 arguments. The earlier behavior of silently supplying a nil to the
1161 last variable when there was an odd number of arguments has been
1164 ** `syntax-begin-function' is declared obsolete.
1165 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1166 slot in font-lock-defaults.
1169 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1170 called during startup. Users who call this function in their init
1171 file and still expect it to be run after startup should set
1172 `package-enable-at-startup' to t after the call to
1173 `package-initialize'.
1175 ** `:global' minor mode use `setq-default' rather than `setq'.
1176 This means that you can't use `make-local-variable' and expect them to
1177 "magically" become buffer-local.
1179 ** `inhibit-point-motion-hooks' now defaults to t and is obsolete.
1182 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1183 The `track-mouse' form no longer refrains from changing the shape of
1184 the mouse pointer for the entire time the body of that form is
1185 executed. Lisp programs that use `track-mouse' for dragging across
1186 large portions of the Emacs display, and want to avoid changes in the
1187 pointer shape during dragging, should bind the variable `track-mouse'
1188 to the special value `dragging' in the body of the form.
1191 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1192 has any effect. (This change was made in Emacs 24.4 but was not
1193 advertised at the time.)
1195 ** `indirect-function' does not signal `void-function' any more.
1196 This is mostly a bug-fix, since this change was missed back in 24.4 when
1197 symbol-function was changed not to signal `void-function' any more.
1199 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1201 ** Comint, term, and compile do not set the EMACS env var any more.
1202 Use the INSIDE_EMACS environment variable instead.
1204 ** `save-excursion' does not save&restore the mark any more.
1206 ** read-buffer-function can now be called with a 4th argument (`predicate').
1208 ** completion-table-dynamic stays in the minibuffer.
1209 If you want the old behavior of calling the function in the buffer
1210 from which the minibuffer was entered, call it with the new argument
1213 ** window-configurations no longer record the buffers' marks.
1215 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1216 active region handling.
1218 ** deactivate-mark is now buffer-local.
1220 ** `cl-the' now asserts that its argument is of the given type.
1222 ** `process-running-child-p` may now return a numeric process
1223 group ID instead of `t'.
1226 ** Mouse click events on mode line or header line no longer include
1227 any reference to a buffer position. The 6th member of the mouse
1228 position list returned for such events is now nil.
1230 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1231 These slots used to hold key-shortcut data, but have been obsolete since
1234 ** Emacs no longer downcases the first letter of a system diagnostic
1235 when signaling a file error. For example, it now reports "Permission
1236 denied" instead of "permission denied". The old behavior was problematic
1237 in languages like German where downcasing rules depend on grammar.
1240 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1241 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1242 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1243 and apostrophe `like this'. The default value nil acts like ‘curve’
1244 if curved single quotes are displayable, and like ‘grave’ otherwise.
1245 The new variable affects display of diagnostics and help, but not of info.
1248 ** substitute-command-keys now replaces quotes.
1249 That is, it converts documentation strings’ quoting style as per the
1250 value of ‘text-quoting-style’. Doc strings in source code can use
1251 either curved single quotes or grave accents and apostrophes. As
1252 before, characters preceded by \= are output as-is.
1255 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1256 They use the new ‘format-message’ function instead of plain ‘format’,
1257 so that they now follow user preference as per ‘text-quoting-style’
1258 when processing curved single quotes, grave accents, and apostrophes
1259 in their format argument.
1262 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1263 now match multibyte characters using Unicode character properties.
1264 If you want the old behavior where they matched any character with
1265 word syntax, use `\sw' instead.
1268 ** The character classes [:graph:] and [:print:] in regular expressions
1269 no longer match every multibyte character. Instead, Emacs now
1270 consults the Unicode character properties to determine which
1271 characters are graphic or printable. In particular, surrogates and
1272 unassigned codepoints are now rejected. If you want the old behavior,
1273 use [:multibyte:] instead.
1276 ** The `diff' command uses the unified format now. To restore the old
1277 behavior, set `diff-switches' to `-c'.
1279 ** `grep-template' and `grep-find-template' values don't include the
1280 --color argument anymore. It's added at the <C> place holder position
1281 dynamically. Any third-party code that changes these templates should
1282 be updated accordingly.
1285 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1286 The new behavior is compatible with Common Lisp and with XEmacs.
1287 This change does not affect Lisp code intended to be portable to
1288 Emacs 24.2 and earlier, which did not support unary ‘/’.
1291 ** The `default-directory' value doesn't have to end slash. To make
1292 that happen, `unhandled-file-name-directory' now defaults to calling
1293 `file-name-as-directory'.
1296 * Lisp Changes in Emacs 25.1
1299 *** New UPatterns `quote', `app', `cl-struct', `eieio', `seq', and `map'.
1300 *** New UPatterns can be defined with `pcase-defmacro'.
1302 *** New vector QPattern.
1304 ** syntax-propertize is now automatically called on-demand during forward
1305 parsing functions like `forward-sexp'.
1307 ** New hooks prefix-command-echo-keystrokes-functions and
1308 prefix-command-preserve-state-hook, to allow the definition of prefix
1309 commands other than the predefined C-u.
1311 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1313 ** The default value of `load-read-function' is now `read'.
1315 ** New hook `pre-redisplay-functions', a bit easier to use than pre-redisplay-function.
1317 ** The second arg of `looking-back' should always be provided explicitly.
1319 ** Obsolete text properties `intangible', `point-entered', and `point-left'.
1320 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1321 implemented by the new `cursor-intangible-mode' and
1322 `cursor-sensor-mode' minor modes.
1324 ** New process type `pipe', which can be used in combination with the
1325 `:stderr' keyword of make-process to handle standard error output
1328 ** New function `make-process' provides an alternative interface to
1329 `start-process'. It allows programs to set process parameters such as
1330 process filter, sentinel, etc., through keyword arguments (similar to
1331 `make-network-process').
1334 ** A new function `directory-files-recursively' returns all matching
1335 files (recursively) under a directory.
1338 ** New variable `inhibit-message', when bound to non-nil, inhibits
1339 `message' and related functions from displaying messages in the echo
1340 area. The output is still logged to the *Messages* buffer.
1343 ** A new text property `inhibit-read-only' can be used in read-only
1344 buffers to allow certain parts of the text to be writable.
1347 ** A new variable `comment-end-can-be-escaped' is useful in languages
1348 such as C and C++ where line comments with escaped newlines are
1349 continued to the next line.
1352 ** New macro `define-advice'.
1354 ** `read-buffer' takes a new `predicate' argument.
1356 ** Emacs Lisp now supports generators.
1358 ** New finalizer facility for running code when objects
1361 ** lexical closures can use (:documentation <form>) to build their docstring.
1362 It should be placed right where the docstring would be, and <form> is then
1363 evaluated (and should return a string) when the closure is built.
1365 ** define-inline provides a new way to define inlinable functions.
1367 ** New function `macroexpand-1' to perform a single step of macroexpansion.
1369 ** Some "x-*" were obsoleted:
1370 *** x-select-text is renamed gui-select-text.
1371 *** x-selection-value is renamed gui-selection-value.
1372 *** x-get-selection is renamed gui-get-selection.
1373 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1374 *** x-get-selection-value is renamed to gui-get-primary-selection.
1375 *** x-set-selection is renamed to gui-set-selection
1377 ** New function `string-greaterp', which return the opposite result of
1381 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1382 preserve the collation order as defined by the system's locale(1)
1383 environment. For the time being this is implemented for modern POSIX
1384 systems and for MS-Windows, for other systems they fall back to their
1385 counterparts `string-lessp' and `string-equal'.
1388 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1389 If you want the old, locale-independent sorting, customize the new
1390 option `ls-lisp-use-string-collate' to a nil value.
1393 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1394 if set to a non-nil value, causes the above 2 functions to ignore
1395 symbol and punctuation characters when collating strings. This
1396 emulates the behavior of modern Posix platforms when the locale's
1397 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1398 MS-Windows doesn't support UTF-8 as codeset in its locales.
1400 ** New function `alist-get', which is also a valid place (aka lvalue).
1402 ** New function `funcall-interactively', which works like `funcall'
1403 but makes `called-interactively-p' treat the function as (you guessed it)
1404 called interactively.
1406 ** New function `function-put' to use instead of `put' for function properties.
1409 ** The new function `bidi-find-overridden-directionality' allows to
1410 find characters whose directionality was, perhaps maliciously,
1411 overridden by directional override control characters. Lisp programs
1412 can use this to detect potential phishing of URLs and other links that
1413 exploits bidirectional display reordering.
1416 ** The new function `buffer-substring-with-bidi-context' allows to
1417 copy a portion of a buffer into a different location while preserving
1418 the visual appearance both of the copied text and the text at
1419 destination, even when the copied text includes mixed bidirectional
1420 text and directional control characters.
1423 ** New properties that can be specified with `declare':
1424 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1425 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1426 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1430 ** New macro `with-file-modes', for evaluating expressions with default file
1431 permissions set to temporary values (e.g., for creating private files).
1433 ** You can access the slots of structures using `cl-struct-slot-value'.
1435 ** Function `sort' can deal with vectors.
1437 ** Function `system-name' now returns an updated value if the current
1438 system's name has changed or if the Emacs process has changed systems,
1439 and to avoid long waits it no longer consults DNS to canonicalize the
1440 name. The variable `system-name' is now obsolete.
1443 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1445 ** If `pwd' is called with a prefix argument, insert the current default
1449 ** New functions return extended information about fonts and faces.
1452 *** The function `font-info' now returns more details about a font.
1453 In particular, it now returns the average width of the font's
1454 characters, which can be used for geometry-related calculations.
1457 *** A new function `default-font-width' returns the average width of a
1458 character in the current buffer's default font. If the default face
1459 is remapped (see `face-remapping-alist'), the value for the remapped
1460 face is returned. This function complements the existing function
1461 `default-font-height'.
1464 *** New functions `window-font-height' and `window-font-width' return
1465 the height and average width of characters in a specified face and
1466 window. If FACE is remapped (see `face-remapping-alist'), the
1467 function returns the information for the remapped face.
1470 *** A new function `window-max-chars-per-line' returns the maximal
1471 number of characters that can be displayed on one line. If a face
1472 and/or window are provided, these values are used for the
1473 calculation. This function is different from `window-body-width' in
1474 that it accounts for (i) continuation glyphs, (ii) the size of the
1475 font, and (iii) the specified window.
1478 ** New utilities in subr-x.el:
1479 *** New macros `if-let' and `when-let' allow defining bindings and to
1480 execute code depending whether all values are true.
1481 *** New macros `thread-first' and `thread-last' allow threading a form
1482 as the first or last argument of subsequent forms.
1485 ** Documentation strings now support quoting with curved single quotes
1486 ‘like-this’ in addition to the old style with grave accent and
1487 apostrophe `like-this'. The new style looks better on today's displays.
1488 In the new Electric Quote mode, you can enter curved single quotes
1489 into documentation by typing ` and '. Outside Electric Quote mode,
1490 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1491 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1492 ‘text-quoting-style’, the user can specify how to display doc string
1496 ** New function ‘format-message’ is like ‘format’ and also converts
1497 curved single quotes, grave accents and apostrophes as per
1498 ‘text-quoting-style’.
1501 ** show-help-function's arg is converted via substitute-command-keys
1502 before being passed to the function. Help strings, help-echo
1503 properties, etc. can therefore contain command key escapes and
1507 ** Time-related changes:
1509 *** Time conversion functions now accept an optional ZONE argument
1510 that specifies the time zone rules for conversion. ZONE is omitted or
1511 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1512 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1513 rule. The affected functions are ‘current-time-string’,
1514 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1515 function ‘encode-time’, which already accepted a simple time zone rule
1516 argument, has been extended to accept all the new forms.
1518 *** Time-related functions now consistently accept numbers
1519 (representing seconds since the epoch) and nil (representing the
1520 current time) as well as the usual list-of-integer representation.
1521 Affected functions include `current-time-string', `current-time-zone',
1522 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1523 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1524 `time-to-days', and `time-to-seconds'.
1526 *** The `encode-time-value' and `with-decoded-time-value' macros have
1529 *** `calendar-next-time-zone-transition', `time-add', and
1530 `time-subtract' no longer return time values in the obsolete and
1531 undocumented integer-pair format. Instead, they return a list of two
1535 ** New function `set-binary-mode' allows to switch a standard stream
1536 of the Emacs process to binary I/O mode.
1539 ** The new function `directory-name-p' can be used to check whether a file
1540 name (as returned from, for instance, `file-name-all-completions') is
1541 a directory file name. It returns non-nil if the last character in
1542 the name is a directory separator character (forward slash on GNU and
1543 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1545 ** ASCII approximations to curved quotes are put in standard-display-table
1546 if the terminal cannot display curved quotes.
1548 ** Standard output and error streams now transliterate characters via
1549 standard-display-table, and encode output using locale-coding-system.
1552 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1555 ** New possible value for `system-type': `nacl'.
1556 This is used by Google's Native Client (NaCl).
1558 ** Miscellaneous name change
1560 For consistency with the usual Emacs spelling, the Lisp variable
1561 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1562 The old name should still work, as an obsolescent alias.
1564 ** Changes in Frame- and Window- Handling
1567 *** Emacs can now draw horizontal scroll bars on some platforms that
1568 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1569 Horizontal scroll bars are turned off by default.
1570 **** New function `horizontal-scroll-bars-available-p' telling whether
1571 horizontal scroll bars are available on the underlying system.
1572 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1573 bars on all existing and future frames.
1574 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1575 scroll bars on the selected frame.
1576 **** New frame parameters `horizontal-scroll-bars' and
1577 `scroll-bar-height' to set horizontal scroll bars and their height
1578 for individual frames and in `default-frame-alist'.
1579 **** New functions `frame-scroll-bar-height' and
1580 `window-scroll-bar-height' return the height of horizontal scroll
1581 bars on a specific frame or window.
1582 **** `set-window-scroll-bars' now accepts five parameters where the last
1583 two specify height and type of the window's horizontal scroll bar.
1584 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
1586 **** New buffer-local variables `horizontal-scroll-bar' and
1587 `scroll-bar-height'.
1590 *** New functions `frame-geometry' and `frame-edges' give access to a
1594 *** New functions `mouse-absolute-pixel-position' and
1595 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1599 *** The function `window-edges' now accepts three additional arguments to
1600 retrieve body, absolute and pixel edges of the window.
1603 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
1604 `window-inside-absolute-pixel-edges' have been renamed to respectively
1605 `window-body-edges', `window-body-pixel-edges' and
1606 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1609 *** New function `window-absolute-pixel-position' to get the screen
1610 coordinates of a visible buffer position.
1613 *** The height of a frame's menu and tool bar are no longer counted in the
1614 frame's text height. This means that the text height stands only for
1615 the height of the frame's root window plus that of the echo area (if
1616 present). This was already the behavior for frames with external tool
1617 and menu bars (like in the Gtk builds) but has now been extended to all
1621 *** Frames now do not necessarily preserve the number of columns or lines
1622 they display when setting default font, menu bar, fringe width, or
1623 scroll bars. In particular, maximized and fullscreen frames are
1624 conceptually never resized if such settings change. For fullheight and
1625 fullwidth frames, the behavior may depend on the toolkit used.
1626 **** New option `frame-inhibit-implied-resize' if non-nil, means that
1627 setting default font, menu bar, fringe width, or scroll bars of a
1628 specific frame does not resize that frame in order to preserve the
1629 number of columns or lines it displays.
1632 *** New function `window-preserve-size' allows to preserve the size of
1633 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1634 `temp-buffer-resize-mode' and `display-buffer'.
1637 *** New `display-buffer' action function `display-buffer-use-some-frame'.
1638 This displays the buffer in an existing frame other than the current
1639 frame, and allows the caller to specify a frame predicate to exclude
1643 *** New minor mode `window-divider-mode' and options
1644 `window-divider-default-places', `window-divider-default-bottom-width'
1645 and `window-divider-default-right-width'.
1647 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
1648 Those features have been deprecated in Gtk+ for a long time.
1652 *** etags no longer qualifies class members by default.
1654 By default, `etags' will not qualify class members for C-like
1655 object-oriented languages with their class names and namespaces, and
1656 will remove qualifications used explicitly in the code from the tag
1657 names it puts in TAGS files. This is so the etags.el back-end for
1658 `xref-find-definitions' is more accurate and produces less false
1661 Use --class-qualify (-Q) if you want the old default behavior of
1662 qualifying class members in C++, Java, and Objective C. Note that
1663 using -Q might make some class members become "unknown" to `M-.'
1664 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1665 qualified names by hand.
1667 *** New language Ruby
1669 Names of modules, classes, methods, and functions are tagged.
1670 Overloaded operators are also tagged.
1672 *** Improved support for Lua
1674 Etags now tags functions even if the "function" keyword follows some
1675 whitespace at line beginning.
1678 * Changes in Emacs 25.1 on Non-Free Operating Systems
1681 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1682 This includes the makefile.w32-in files in various subdirectories, and
1683 the support files. The file nt/configure.bat now just tells the user
1684 to use the procedure described in nt/INSTALL, by running the Posix
1685 `configure' script in the top-level directory.
1688 ** Building Emacs for MS-Windows requires at least Windows XP
1689 or Windows Server 2003. The built binaries still run on all versions
1690 of Windows starting with Windows 9X.
1693 ** Emacs running on MS-Windows now supports the daemon mode.
1695 ** The byte counts in etags-generated TAGS files are now the same on
1696 MS-Windows as they are on other platforms.
1699 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1700 Pass '--without-ns' to configure to create an X11 build, the old default.
1702 ** OS X 10.5 or older is no longer supported.
1704 ** OS X on PowerPC is no longer supported.
1707 ** New variable `ns-use-fullscreen-animation' controls animation for
1708 non-native NS fullscreen. The default is nil. Set to t to enable
1709 animation when entering and leaving fullscreen. For native OSX fullscreen
1713 ** The new function 'w32-application-type' returns the type of an
1714 MS-Windows application given the name of its executable program file.
1717 ----------------------------------------------------------------------
1718 This file is part of GNU Emacs.
1720 GNU Emacs is free software: you can redistribute it and/or modify
1721 it under the terms of the GNU General Public License as published by
1722 the Free Software Foundation, either version 3 of the License, or
1723 (at your option) any later version.
1725 GNU Emacs is distributed in the hope that it will be useful,
1726 but WITHOUT ANY WARRANTY; without even the implied warranty of
1727 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1728 GNU General Public License for more details.
1730 You should have received a copy of the GNU General Public License
1731 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1737 paragraph-separate: "[
\f]*$"