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+.
40 ** New configure option --with-modules.
41 This enables support for loading dynamic modules; see below.
44 ** By default, Emacs no longer works on IRIX. We expect that Emacs
45 users are not affected by this, as SGI stopped supporting IRIX in
46 December 2013. If you are affected, please send a bug report. You
47 should be able to work around the problem either by porting the Emacs
48 undumping code to GCC under IRIX, or by configuring --with-wide-int,
49 or by sticking with Emacs 24.4.
52 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
53 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
54 since Emacs 24.4, and the other variants were undocumented and were
55 obstacles to maintenance and development. GC_MARK_STACK and its
56 related symbols have been removed from the C internals.
59 ** 'configure' now prefers gnustep-config when configuring GNUstep.
60 If gnustep-config is not available, the old heuristics are used.
63 ** 'configure' now prefers inotify to gfile for file notification,
64 unless gfile is explicitly requested via --with-file-notification='gfile'.
67 ** The configure option '--with-pkg-config-prog' has been removed.
68 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
71 ** The configure option '--with-mmdf' has been removed.
72 It was no longer useful, as it relied on libraries that are no longer
73 supported, and its presence led to confusion during configuration.
74 This affects only the 'movemail' utility; Emacs itself can still
75 process MMDF-format files as before.
78 ** The configure option '--enable-silent-rules' is now the default,
79 and silent rules are now quieter. To get the old behavior where
80 'make' chatters a lot, configure with '--disable-silent-rules' or
81 build with 'make V=1'.
84 ** The configure option '--with-gameuser' now allows to specify a
85 group instead of a user if its argument is prefixed by ':' (a colon).
86 This will cause the game score files in ${localstatedir}/games/emacs
87 to be owned by that group, and the helper program for updating them to
88 be installed setgid. The option now defaults to the 'games' group.
91 ** The `grep-changelog' script (and its manual page) are no longer included.
92 It has no particular connection to Emacs and has not changed in years,
93 so if you want to use it, you can always take a copy from an older Emacs.
96 ** Emacs 25 comes with a new set of icons.
97 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
98 The old Emacs logo icons are available as `emacs23.png' in the same location.
101 ** New make target `check-expensive' to run additional tests.
102 This includes all tests which run via "make check", plus additional
103 tests which take more time to perform.
106 * Startup Changes in Emacs 25.1
109 ** When Emacs is given a file as a command line argument and
110 `initial-buffer-choice' is non-nil, display both the file and
111 `initial-buffer-choice'. When Emacs is given more than one file and
112 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
113 and *Buffer List*. This makes Emacs convenient to use from the
114 command line when `initial-buffer-choice' is non-nil.
117 ** The value of ‘initial-scratch-message’ is now treated as a doc string
118 and can contain escape sequences for command keys, quotes, and the like.
121 * Changes in Emacs 25.1
124 ** Emacs can now load shared/dynamic libraries (modules).
125 A dynamic Emacs module is a shared library that provides additional
126 functionality for use in Emacs Lisp programs, just like a package
127 written in Emacs Lisp would. The functions `load', `require',
128 `load-file', etc. were extended to load such modules, as they do with
129 Emacs Lisp packages. The new variable `module-file-suffix' holds the
130 system-dependent value of the file-name extension (`.so' on Posix
131 hosts) of the module files.
133 A module should export a C-callable function named
134 `emacs_module_init', which Emacs will call as part of the call to
135 `load' or `require' which loads the module. It should also export a
136 symbol named `plugin_is_GPL_compatible' to indicate that its code is
137 released under the GPL or compatible license; Emacs will refuse to
138 load modules that don't export such a symbol.
140 If a module needs to call Emacs functions, it should do so through the
141 API defined and documented in the header file `emacs-module.h'. Note
142 that any module that provides Lisp-callable functions will have to use
143 Emacs functions such as `fset' and `funcall', in order to register its
144 functions with the Emacs Lisp interpreter.
146 Modules can create `user-ptr' Lisp objects that embed pointers to C
147 struct's defined by the module. This is useful for keeping around
148 complex data structures created by a module, to be passed back to the
149 module's functions. User-ptr objects can also have associated
150 "finalizers" -- functions to be run when the object is GC'ed; this is
151 useful for freeing any resources allocated for the underlying data
152 structure, such as memory, open file descriptors, etc. A new
153 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
156 Loadable modules in Emacs are an experimental feature, and subject to
157 change in future releases. For that reason, their support is disabled
158 by default, and must be enabled by using the `--with-modules' option
162 ** Any file of the form .dir-locals*.el is now considered a dir-local
163 file, and multiple such files can be used in the same directory. See
164 the variable `dir-locals-file' for more information.
167 ** Network security (TLS/SSL certificate validity and the like) is
168 added via the new Network Security Manager (NSM) and controlled via
169 the `network-security-level' variable.
171 ** If Emacs isn't built with TLS support, an external TLS-capable
172 program is used instead. This program used to be run in --insecure
173 mode by default, but has now changed to be secure instead, and will
174 fail if you try to connect to non-verifiable hosts. This is
175 controlled by the `tls-program' variable.
178 ** C-h l now also lists the commands that were run.
181 ** x-select-enable-clipboard is renamed select-enable-clipboard
182 and x-select-enable-primary is renamed select-enable-primary.
183 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
184 name it), with the proviso that on some systems (e.g. Windows)
185 select-enable-primary is ineffective since the system doesn't
186 have the equivalent of a primary selection.
189 ** New option `switch-to-buffer-in-dedicated-window' allows to customize
190 how `switch-to-buffer' proceeds interactively when the selected window
191 is strongly dedicated to its buffer.
194 ** The option `even-window-heights' has been renamed to
195 `even-window-sizes' and now handles window widths as well.
198 ** terpri gets an optional arg ENSURE to conditionally output a newline.
201 ** `insert-register' now leaves point after the inserted text
202 when called interactively. A prefix argument toggles this behavior.
205 ** The new variable `term-file-aliases' replaces some files from lisp/term.
206 The function `tty-run-terminal-initialization' consults this variable
207 when deciding what terminal-specific initialization code to run.
210 ** New variable `system-configuration-features', listing some of the
211 main features that Emacs was compiled with. This is mainly intended
212 for use in Emacs bug reports.
215 ** A password is now hidden also when typed in batch mode. Another
216 hiding character but the default `.' can be used by let-binding the
217 variable `read-hide-char'.
220 ** The Emacs pseudo-random number generator can be securely seeded.
221 On system where Emacs can access the system entropy or some other
222 cryptographically secure random stream, it now uses that when `random'
223 is called with its argument `t'. This allows cryptographically strong
224 random values; in particular, the Emacs server now uses this facility
225 to produce its authentication key.
228 ** New input methods: `tamil-dvorak' and `programmer-dvorak'.
231 * Editing Changes in Emacs 25.1
234 ** M-x suggests shorthands and ignores obsolete commands for completion.
239 *** Successive single-char deletions are collapsed in the undo-log just like
240 successive char insertions. Which commands invoke this behavior is
241 controlled by the new `undo-auto-amalgamate' function. See the node
242 "Undo" in the ELisp manual for more details.
245 *** The heuristic used to insert `undo-boundary' after each command
246 has changed, so that if a command causes changes in more than just the
247 current buffer, Emacs now calls `undo-boundary' in every buffer
248 affected by the command.
251 ** New command `comment-line' bound to `C-x C-;'.
253 ** New and improved facilities for inserting Unicode characters
256 *** Unicode names entered via C-x 8 RET now use substring completion by default.
259 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
260 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
263 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
264 as you type. See also the new variable ‘text-quoting-style’.
267 ** New minor mode global-eldoc-mode is enabled by default.
270 ** Emacs now supports "bracketed paste mode" when running on a terminal
271 that supports it. This facility allows Emacs to understand pasted
272 chunks of text as strings to be inserted, instead of interpreting each
273 character in the pasted text as actual user input. This results in a
274 paste experience similar to that under a window system, and significant
275 performance improvements when pasting large amounts of text.
278 ** Emacs now supports the latest version of the UBA.
279 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
280 was updated to support all the latest additions and changes introduced
281 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
282 This includes full support for directional isolates and the
283 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
287 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
290 ** New buffer-local `electric-pair-local-mode'.
293 ** New variable `fast-but-imprecise-scrolling' inhibits
294 fontification during full screen scrolling operations, giving less
295 hesitant operation during auto-repeat of C-v, M-v at the cost of
296 possible inaccuracies in the end position.
299 ** New documentation command `describe-symbol'.
300 Works for functions, variables, faces, etc. It is bound to `C-h o' by
304 ** New function `custom-prompt-customize-unsaved-options' checks for
305 unsaved customizations and prompts user to customize (if found). It
306 is intended for adding to 'kill-emacs-query-functions'.
309 * Changes in Specialized Modes and Packages in Emacs 25.1
314 *** New command `checkdoc-package-keywords' checks if the
315 current package keywords are recognized. Set the new option
316 `checkdoc-package-keywords-flag' to non-nil to make
317 `checkdoc-current-buffer' call this function automatically.
320 *** New function `checkdoc-file' checks for style errors.
321 It's meant for use together with `compile':
322 emacs -batch --eval "(checkdoc-file \"subr.el\")"
325 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
326 It raises an error if a bookmark of that name already exists,
327 unlike `bookmark-set' which silently updates an existing bookmark.
332 *** `imap-ssl-program' has been removed, and imap.el uses the internal
333 GnuTLS encryption functions if possible.
338 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
339 the ordering of object keys by default.
342 *** New commands `json-pretty-print-ordered' and
343 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
344 object keys sorted alphabetically.
347 ** Prog mode has some support for multi-mode indentation.
348 This allows better indentation support in modes that support multiple
349 programming languages in the same buffer, like literate programming
350 environments or ANTLR programs with embedded Python code.
352 A major mode can provide indentation context for a sub-mode through
353 the `prog-indentation-context' variable. To support this, modes that
354 provide indentation should use `prog-widen' instead of `widen' and
355 `prog-first-column' instead of a literal zero. See the node
356 "Mode-Specific Indent" in the ELisp manual for more details.
358 ** Prettify Symbols mode
361 *** Prettify Symbols mode supports custom composition predicates. By
362 overriding the default `prettify-symbols-compose-predicate', modes can
363 specify in which contexts a symbol may be displayed as some Unicode
364 character. `prettify-symbols-default-compose-p' is the default which
365 is suitable for most programming languages such as C or Lisp (but not
369 *** Symbols can be unprettified while point is inside them.
370 New variable `prettify-symbols-unprettify-at-point' configures this.
372 ** Enhanced xterm support
375 *** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
376 This variable tells Emacs which advanced capabilities are available in
377 the xterm terminal emulator used to display Emacs text-mode frames.
378 The default is to check each capability, and use it if available.
379 (This variable was introduced in Emacs 24.1, but was not announced in
383 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
384 in the surrounding GUI (using the OSC-52 escape sequence). This only works
385 if your xterm supports it and enables the `allowWindowOps' options (disabled
386 by default at least in Debian, for security reasons).
388 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
389 escape sequence) if your xterm has the feature enabled but for that you
390 additionally need to add `getSelection' to `xterm-extra-capabilities'.
393 *** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
396 ** The `save-place' variable is replaced by `save-place-mode'.
401 *** ERC can now hide message types by network or channel.
402 `erc-hide-list' will hide all messages of the specified type, while
403 `erc-network-hide-list' and `erc-channel-hide-list' will only hide the
404 specified message types for the respective specified targets.
409 *** `midnight-mode' is now a proper minor mode.
412 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
417 *** New "external" package status.
418 An external package is any installed package that's not built-in and
419 not from `package-user-dir', which usually means it's from an entry in
420 `package-directory-list'. They are treated much like built-in
421 packages, in that they cannot be deleted through the package menu and
422 are not considered for upgrades.
424 The effect is that a user can manually place a specific version of a
425 package inside `package-directory-list' and the package menu will
429 *** If a package is available on multiple archives and one has higher
430 priority (as per `package-archive-priorities') only that one is
431 listed. This can be configured with `package-menu-hide-low-priority'.
434 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
435 This includes the above-mentioned low-priority packages, as well as
436 available packages whose version is lower than the currently installed
437 version (which were previously impossible to display).
438 This allows users to downgrade a package if a lower version is
442 *** When filtering the package menu, keywords starting with "arc:" or
443 "status:" represent package archive or status, respectively, instead
447 *** Most functions which involve downloading information now take an
448 ASYNC argument. If it is non-nil, package.el performs the download(s)
452 *** New variable `package-menu-async' controls whether the
453 package-menu uses asynchronous downloads.
456 *** `package-install-from-buffer' and `package-install-file' work on directories.
457 This follows the same rules as installing from a .tar file, except the
458 -pkg file is optional.
461 *** Packages which are dependencies of other packages cannot be deleted.
462 The FORCE argument to `package-delete' overrides this.
465 *** New custom variable `package-selected-packages' tracks packages
466 which were installed by the user (as opposed to installed as
467 dependencies). This variable can also be manually customized.
470 *** New command `package-install-user-selected-packages' installs all
471 packages from `package-selected-packages' which are currently missing.
474 *** New command `package-autoremove' removes all packages which were
475 installed strictly as dependencies but are no longer needed.
480 When you invoke `shell' interactively, the *shell* buffer will now
481 display in a new window. However, you can customize this behavior via
482 the `display-buffer-alist' variable. For example, to get
483 the old behavior -- *shell* buffer displays in current window -- use
484 (add-to-list 'display-buffer-alist
485 '("^\\*shell\\*$" . (display-buffer-same-window))).
489 *** The `:protection' slot option is not obeyed any more.
491 *** The `newname' argument to constructors is optional&deprecated.
492 If you need your objects to be named, do it by inheriting from `eieio-named'.
494 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
496 *** The <class> variables are declared obsolete.
498 *** The <initarg> variables are declared obsolete.
499 *** defgeneric and defmethod are declared obsolete.
501 *** `constructor' is now an obsolete alias for `make-instance'.
506 *** New command `ido-bury-buffer-at-head' bound to C-S-b
507 Bury the buffer at the head of `ido-matches', analogous to how C-k
508 kills the buffer at head.
511 *** A prefix argument to `ido-restrict-to-matches' will reverse its
512 meaning, and the list is restricted to those elements that do not
513 match the current input.
518 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
519 The new commands `next-line-or-history-element' and
520 `previous-line-or-history-element', bound to <UP> and <DOWN> in the
521 minibuffer, allow by-line movement through minibuffer history,
522 similarly to an ordinary buffer. Only when point moves over
523 the bottom/top of the minibuffer it goes to the next/previous history
524 element. `M-p' and `M-n' still move directly to previous/next history
527 ** Search and Replace
530 *** New user option `search-default-regexp-mode'
531 specifies the default mode for I-search.
534 *** `isearch' and `query-replace' can now perform character folding in matches.
535 Isearch does that by default, while `query-replace' will do that if
536 the new variable `replace-character-fold' is customized to a non-nil
537 value. This is analogous to case folding, but instead of disregarding
538 case variants, it disregards wider classes of distinctions between
539 similar characters. (Case folding is a special case of character
540 folding.) This means many characters in the search string will match
541 entire groups of characters instead of just themselves.
543 For instance, the " will match all variants of double quotes (like “
544 and ”), and the letter a will match all of its accented cousins, even
545 those composed of multiple characters, as well as many other symbols
549 *** New function `character-fold-to-regexp' can be used
550 by searching commands to produce a regexp matching anything that
551 character-folds into STRING.
554 *** The new M-s M-w key binding uses eww to search the web for the
555 text in the region. The search engine to use for this is specified by
556 the customizable variable `eww-search-prefix'.
559 *** Query-replace history is enhanced.
560 When query-replace reads the FROM string from the minibuffer, typing
561 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
562 and TO are the original text and its replacement, and SEP is an arrow
563 string defined by the new variable `query-replace-from-to-separator'.
564 To select a prior replacement, type `M-p' until the desired
565 replacement appears in the minibuffer, and then exit the minibuffer by
570 *** If `quick-calc' is called with a prefix argument, insert the
571 result of the calculation into the current buffer.
574 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
575 this you can tell Edebug not to stop at the start of the first
576 instrumented function.
581 *** New minor mode `global-eldoc-mode'
582 It is turned on by default, and affects `*scratch*' and other buffers
583 whose major mode supports Emacs Lisp.
586 *** `eldoc-documentation-function' now defaults to `ignore'
589 *** `describe-char-eldoc' displays information about character at point,
590 and can be used as a default value of `eldoc-documentation-function'. It is
591 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
592 ] [, ] [, etc.) while using mono-spaced font.
597 *** HTML can now be rendered using variable-width fonts.
600 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
601 whether to use variable-pitch fonts or not. The user can also
602 customize the `shr-use-fonts' variable.
605 *** A new command `R' (`eww-readable') will try do identify the main
606 textual parts of a web page and display only that, leaving menus and
607 the like off the page.
610 *** You can now use several eww buffers in parallel by renaming eww
611 buffers you want to keep separate.
614 *** Partial state of the eww buffers (the URIs and the titles of the
615 pages visited) is now preserved in the desktop file.
618 *** `eww-after-render-hook' is now called after eww has rendered
619 the data in the buffer.
622 *** The `eww-reload' command now takes a prefix to not reload via
623 the net, but just use the local copy of the HTML.
626 *** The DOM shr and eww uses has been changed to the general Emacs
627 xml.el/libxml2 DOM, and a new package dom.el has been added to
628 interact with this DOM. See the Emacs Lisp manual for interface
632 *** `mailcap-mime-data' is now consulted when displaying PDF files.
635 *** The new `S' command will list all eww buffers, and allow managing
639 *** https pages with valid certificates have headers marked in green, while
640 invalid certificates are marked in red.
645 *** text/html messages that contain inline image parts will be
646 transformed into multipart/related messages before sending.
649 ** In Show Paren Mode, a parenthesis can be highlighted when point
650 stands inside it, and certain parens can be highlighted when point is
651 at BOL or EOL, or in whitespace there. To enable these, customize,
652 respectively, `show-paren-when-point-inside-paren' or
653 `show-paren-when-point-in-periphery'.
658 *** Strings after `:documentation' are highlighted as docstrings.
659 This enhances Lisp mode fontification to handle documentation of the
660 form `(:documentation "the doc string")' used in Common Lisp code for
661 CLOS class and slot documentation.
666 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
669 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
670 *** `string-rectangle' provides on-the-fly preview of the result.
673 ** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
674 These should be used in preference to `font-lock-fontify-buffer' when
678 ** Macro `minibuffer-with-setup-hook' can optionally append a function
679 to `minibuffer-setup-hook'.
681 If the first argument of the macro is of the form `(:append FUN)',
682 then FUN will be appended to `minibuffer-setup-hook', instead of
687 *** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
689 ** Calendar and diary
692 *** The default `diary-file' is now located in .emacs.d.
695 *** New commands to insert diary entries with Chinese dates:
696 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
697 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
700 *** The calendar can now list and mark diary entries with Chinese dates.
701 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
704 *** The option `calendar-mode-line-format' can now be nil,
705 which means to do nothing special with the mode line in calendars.
708 *** New option `calendar-weekend-days'.
709 The option customizes which day headers receive the
710 `calendar-weekend-header' face.
713 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
716 *** Many items obsolete since at least version 23.1 have been removed.
717 The majority were function/variable/face aliases, too numerous to list here.
720 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
721 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
723 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
725 **** Macro `calendar-for-loop'.
727 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
729 **** The nil and list forms of `diary-display-function'.
732 ** New ERT function `ert-summarize-tests-batch-and-exit'.
733 If the output of ERT tests in batch mode execution can be saved to a
734 log file, then it can be passed as an argument to the above function
735 to produce a neat summary.
738 ** New js.el option `js-indent-first-init'.
743 ** Info mode now displays symbol names in fixed-pitch font.
744 If you want to get the old behavior back, customize the `Info-quoted'
745 face to use the same definitions as the default face.
748 *** `Info-fontify-maximum-menu-size' can be t for no limit.
751 *** `info-display-manual' can now be given a prefix argument which (any
752 non-nil value) directs the command to limit the completion
753 alternatives to currently visited manuals.
756 ** ntlm.el has support for NTLM2.
761 *** The Rmail commands `d', `C-d' and `u' take optional repeat counts
762 to delete or undelete multiple messages.
765 *** Rmail can now render HTML mail messages if your Emacs was built with
766 libxml2 or if you have the Lynx browser installed. By default, Rmail
767 will display the HTML version of a mail message that has both HTML and
768 plain text parts, if display of HTML email is possible; customize the
769 `rmail-mime-prefer-html' option to `nil' if you don't want that.
772 *** In the commands that make summaries by subject, recipients, or senders,
773 you can no longer use commas to separate regular expressions.
776 ** SES now supports local printer functions; see `ses-define-local-printer'.
780 *** In sh-mode you can now use `sh-shell' as a file-local variable to
781 specify the type of shell in use (bash, csh, etc).
784 *** New value `always' for `sh-indent-after-continuation'.
785 This provides old-style ("dumb") indentation of continued lines.
786 See the doc string of `sh-indent-after-continuation' for details.
790 *** Fatal TLS errors are now silent by default.
795 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
796 When `url-handler-mode' is enabled, file operations for these
797 protocols as well as for "telnet" and "ftp" are passed to Tramp.
800 *** The URL package allows customizing the `url-user-agent' string.
801 The new `url-user-agent' variable can be customized to be a string or
805 *** The new interface variable `url-request-noninteractive' can be used
806 to specify that we're running in a noninteractive context, and that
807 we should not be queried about things like TLS certificate validity.
810 *** If URL is used with a https connection, the first callback argument
811 plist will contain a :peer element that has the output of
812 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
817 *** New connection method "afp", which allows to access Mac OS X
818 volumes via the Apple Filing Protocol.
821 *** New connection method "nc", which allows to access dumb busyboxes.
824 *** Method-specific parameters can be overwritten now with variable
825 `tramp-connection-properties'.
828 *** Handler for `file-notify-valid-p' for remote machines that support
829 filesystem notifications.
834 *** New user variable `sql-default-directory' enables remote
835 connections using Tramp.
838 *** New command `sql-send-line-and-next'.
839 This command, bound to `C-c C-n' by default, sends the current line to
840 the SQL process and advances to the next line, skipping whitespace and
844 *** Added support for Vertica SQL.
846 ** VC and related modes
849 *** Basic push support, via `vc-push', bound to `C-x v P'.
850 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
851 (undocumented) command vc-hg-push now behaves slightly differently.
854 *** The new command vc-region-history shows the log+diff of the active region.
857 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
858 This command is useful when you perform version control commands
859 outside Emacs (e.g., from the shell prompt), or if you switch the VC
860 back-end for the buffer's file, or remove it from version control.
863 *** New option `vc-annotate-background-mode' controls whether
864 the color range from `vc-annotate-color-map' is applied to the
865 background or to the foreground.
868 *** `compare-windows' now compares text with the most recently selected window
869 instead of the next window. If you want the previous behavior of
870 comparing with the next window, customize the new option
871 `compare-windows-get-window-function' to the value
872 `compare-windows-get-next-window'.
875 *** Two new faces `compare-windows-removed' and `compare-windows-added'
876 replace the face `compare-windows', which is now an obsolete alias for
877 `compare-windows-added'.
880 *** `log-edit-insert-changelog' converts "(tiny change)" to
881 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
885 ** VHDL mode now supports VHDL'08.
890 *** Decimal display mode uses "," groups, so it's more
891 fitting for use in money calculations
894 *** Factorial works with non-integer inputs.
899 *** Hide-IfDef mode now support full C/C++ expressions in macros,
900 macro argument expansion, interactive macro evaluation and automatic
901 scanning of #define'd symbols.
904 *** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
905 result of evaluating a macro.
908 *** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
909 all defined symbols in `hide-ifdef-env'.
912 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
913 file name patterns. Defaults to files whose extension is one of `.h',
914 `.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
917 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
918 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
919 (This could happen when an idempotent header file is visited again,
920 when its guard symbol is already defined.) Defaults to `t'.
923 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
924 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
925 looking for macro definitions. By default, no symbols are ignored.
930 *** New custom variable `tex-print-file-extension' to help users who
931 use PDF instead of DVI.
934 *** TeX mode now supports Prettify Symbols mode. When enabling
935 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
936 many other math macros are displayed using unicode characters.
939 ** New `big-indent' style in `whitespace-mode' highlights deep indentation.
940 By default, 32 consecutive spaces or four consecutive TABs are
941 considered to be too deep, but the new variable
942 `whitespace-big-indent-regexp' can be customized to change that.
945 ** New options in `tildify-mode'.
946 New options `tildify-space-string', `tildify-pattern', and
947 `tildify-foreach-region-function' variables make
948 `tildify-string-alist', `tildify-pattern-alist', and
949 `tildify-ignored-environments-alist' variables (as well as a few
950 helper functions) obsolete.
953 ** New package Xref replaces Etags's front-end and UI
955 The new package Xref provides a generic framework and new commands to
956 find and move to definitions of functions, macros, data structures
957 etc., as well as go back to the location where you were before moving
958 to a definition. It supersedes and obsoletes many Etags commands,
959 while still using the etags.el code that reads the TAGS tables as one
962 The command `xref-find-definitions' replaces `find-tag' and provides
963 an interface to pick one definition among several.
964 `tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
965 `pop-tag-mark', but has a keybinding (`M-,') different from the one
968 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
969 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
970 `xref-find-apropos' replaces `find-tag-regexp'.
972 As a result of this, the following commands are now obsolete:
973 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
976 `tags-loop-continue' is not obsolete because it's still useful in
977 `tags-search' and `tags-query-replace', for which there are no direct
983 `find-tag-marker-ring-length' is now an obsolete alias for
984 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
985 alias for a private variable. `xref-push-marker-stack' and
986 `xref-pop-marker-stack' should be used instead to manipulate the stack
987 of searches for definitions.
990 *** `xref-find-definitions' and `describe-function' now display
991 information about mode local overrides (defined by cedet/mode-local.el
992 `define-overloadable-function' `define-mode-local-overrides').
994 The framework's Lisp API is still experimental and can change in major,
995 backward-incompatible ways.
998 ** New package Project
1000 The new package Project provides generic infrastructure for dealing
1001 with projects. The main commands included in it are
1002 `project-find-file' and `project-find-regexp'.
1004 The Lisp API of this package is still experimental.
1007 EUDC's LDAP backend has been improved.
1010 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
1013 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
1014 subprocess instead of on the command line.
1017 *** EUDC handles LDAP wildcards automatically so the user shouldn't
1018 need to configure this manually anymore.
1021 *** The LDAP configuration section of EUDC's manual has been
1024 There have also been customization changes.
1027 *** New custom variable `eudc-server-hotlist' to allow specifying
1028 multiple EUDC servers in init file.
1031 *** Custom variable `eudc-inline-query-format' defaults to completing
1032 on email and firstname instead of surname.
1035 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
1036 to avoid interfering with the kill ring.
1039 *** Custom variable `eudc-inline-expansion-format' defaults to
1040 "Firstname Surname <mail-address>".
1043 *** Custom variable `eudc-options-file' defaults to
1044 "~/.emacs.d/eudc-options".
1047 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
1048 allow overriding the regular expression that recognizes the ldapsearch
1049 command line's password prompt.
1052 EUDC's BBDB backend now supports BBDB 3.
1055 EUDC's PH backend (eudcb-ph.el) is obsolete.
1060 *** The new built-in command `clear' can scroll window contents out of sight.
1061 If provided with an optional non-nil argument, the scrollback contents will be cleared.
1064 *** New buffer syntax '#<buffer-name>', which is equivalent to
1065 '#<buffer buffer-name>'. This shorthand makes interacting with
1066 buffers from eshell more convenient. Custom variable
1067 `eshell-buffer-shorthand', which has been broken for a while, has been
1071 *** By default, eshell "visual" program buffers (created by
1072 `eshell-visual-commands' and similar custom vars) are no longer killed
1073 when their processes die. This fixes issues with short-lived commands
1074 and makes visual programs more useful in general. For example, if
1075 "git log" is a visual command, it will always show the visual command
1076 buffer, even if the "git log" process dies. For the old behavior,
1077 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
1082 *** Support for the Conkeror web browser.
1085 *** Support for several ancient browsers is now officially obsolete.
1088 ** tar-mode: new `tar-new-entry' command, allowing for new members to
1089 be added to the archive.
1092 ** Autorevert: dired buffers are also auto-reverted via file
1093 notifications, if Emacs is compiled with file notification support.
1095 ** File Notifications
1098 *** The new event `stopped' signals, that a file notification watch is
1099 not active any longer.
1102 *** The new function `file-notify-valid-p' checks, whether a file
1103 notification descriptor still corresponds to an activate watch.
1108 *** The command `dired-do-compress' bound to `Z' now can compress
1109 directories and decompress zip files.
1112 *** New command `dired-do-compress-to' bound to `c' can be used to
1113 compress many marked files into a single named archive. The
1114 compression command is determined from the new
1115 `dired-compress-files-alist' variable.
1117 ** Tabulated List Mode
1120 *** It is now safe for a mode that derives `tabulated-list-mode' to not
1121 call `tabulated-list-init-header', in which case it will have no
1125 *** `tabulated-list-print' takes a second optional argument, update,
1126 which specifies an alternative printing method which is faster when
1127 few or no entries have changed.
1129 ** Obsolete packages
1135 *** landmark.el (moved to elpa.gnu.org)
1138 * New Modes and Packages in Emacs 25.1
1141 ** pinentry.el allows GnuPG passphrase to be prompted through the
1142 minibuffer instead of a graphical dialog, depending on whether the gpg
1143 command is called from Emacs (i.e., INSIDE_EMACS environment variable
1144 is set). This feature requires newer versions of GnuPG (2.1.5 or
1145 later) and Pinentry (0.9.5 or later).
1147 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
1150 ** scss-mode (a minor variant of css-mode)
1153 ** let-alist is a new macro (and a package) that allows one to easily
1154 let-bind the values stored in an alist.
1157 ** `tildify-mode' allows to automatically insert hard spaces as one
1158 types the text. Breaking line after a single-character words is
1159 forbidden by Czech and Polish typography (and may be discouraged in
1160 other languages), so `auto-tildify-mode' makes it easier to create
1161 a typographically-correct documents.
1164 ** The `seq' library adds sequence manipulation functions and macros
1165 that complement basic functions provided by subr.el. All functions
1166 are prefixed with `seq-' and work on lists, strings and vectors.
1169 ** The `map' library provides map-manipulation functions that work on
1170 alists, hash-table and arrays. All functions are prefixed with
1174 ** The `thunk' library provides functions and macros to control the
1175 evaluation of forms.
1178 ** js-jsx-mode (a minor variant of js-mode) provides indentation
1179 support for JSX, an XML-like syntax extension to ECMAScript.
1182 * Incompatible Lisp Changes in Emacs 25.1
1185 ** `setq' and `setf' must now be called with an even number of
1186 arguments. The earlier behavior of silently supplying a nil to the
1187 last variable when there was an odd number of arguments has been
1191 ** `syntax-begin-function' is declared obsolete.
1192 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
1193 slot in font-lock-defaults.
1196 ** `package-initialize' now sets `package-enable-at-startup' to nil if
1197 called during startup. Users who call this function in their init
1198 file and still expect it to be run after startup should set
1199 `package-enable-at-startup' to t after the call to
1200 `package-initialize'.
1203 ** `:global' minor mode use `setq-default' rather than `setq'.
1204 This means that you can't use `make-local-variable' and expect them to
1205 "magically" become buffer-local.
1208 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1209 The `track-mouse' form no longer refrains from changing the shape of
1210 the mouse pointer for the entire time the body of that form is
1211 executed. Lisp programs that use `track-mouse' for dragging across
1212 large portions of the Emacs display, and want to avoid changes in the
1213 pointer shape during dragging, should bind the variable `track-mouse'
1214 to the special value `dragging' in the body of the form.
1217 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1218 has any effect. (This change was made in Emacs 24.4 but was not
1219 advertised at the time.)
1222 ** `indirect-function' does not signal `void-function' any more.
1223 This is mostly a bug-fix, since this change was missed back in 24.4 when
1224 symbol-function was changed not to signal `void-function' any more.
1227 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1230 ** Comint, term, and compile do not set the EMACS env var any more.
1231 Use the INSIDE_EMACS environment variable instead.
1234 ** `save-excursion' does not save&restore the mark any more.
1235 Use `save-mark-and-excursion' if you want the old behavior.
1238 ** `read-buffer' and `read-buffer-function' can now be called with a 4th
1239 argument (`predicate').
1242 ** `completion-table-dynamic' by default stays in the minibuffer.
1243 The minibuffer will be the current buffer when the function is called.
1244 If you want the old behavior of calling the function in the buffer
1245 from which the minibuffer was entered, use the new argument
1246 `switch-buffer' to `completion-table-dynamic'.
1249 ** window-configurations no longer record the buffers' marks.
1252 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1253 active region handling.
1256 ** deactivate-mark is now buffer-local.
1259 ** `cl-the' now asserts that its argument is of the given type.
1262 ** `process-running-child-p' may now return a numeric process
1263 group ID instead of `t'.
1266 ** Mouse click events on mode line or header line no longer include
1267 any reference to a buffer position. The 6th member of the mouse
1268 position list returned for such events is now nil.
1271 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1272 These slots used to hold key-shortcut data, but have been obsolete since
1276 ** Emacs no longer downcases the first letter of a system diagnostic
1277 when signaling a file error. For example, it now reports "Permission
1278 denied" instead of "permission denied". The old behavior was problematic
1279 in languages like German where downcasing rules depend on grammar.
1282 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1283 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1284 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1285 and apostrophe `like this'. The default value nil acts like ‘curve’
1286 if curved single quotes are displayable, and like ‘grave’ otherwise.
1287 The new variable affects display of diagnostics and help, but not of info.
1290 ** substitute-command-keys now replaces quotes.
1291 That is, it converts documentation strings’ quoting style as per the
1292 value of ‘text-quoting-style’. Doc strings in source code can use
1293 either curved single quotes or grave accents and apostrophes. As
1294 before, characters preceded by \= are output as-is.
1297 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1298 They use the new ‘format-message’ function instead of plain ‘format’,
1299 so that they now follow user preference as per ‘text-quoting-style’
1300 when processing curved single quotes, grave accents, and apostrophes
1301 in their format argument.
1304 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1305 now match multibyte characters using Unicode character properties.
1306 If you want the old behavior where they matched any character with
1307 word syntax, use `\sw' instead.
1310 ** The character classes [:graph:] and [:print:] in regular expressions
1311 no longer match every multibyte character. Instead, Emacs now
1312 consults the Unicode character properties to determine which
1313 characters are graphic or printable. In particular, surrogates and
1314 unassigned codepoints are now rejected. If you want the old behavior,
1315 use [:multibyte:] instead.
1318 ** The `diff' command uses the unified format now. To restore the old
1319 behavior, set `diff-switches' to `-c'.
1322 ** `grep-template' and `grep-find-template' values don't include the
1323 --color argument anymore. It's added at the <C> place holder position
1324 dynamically. Any third-party code that changes these templates should
1325 be updated accordingly.
1328 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1329 The new behavior is compatible with Common Lisp and with XEmacs.
1330 This change does not affect Lisp code intended to be portable to
1331 Emacs 24.2 and earlier, which did not support unary ‘/’.
1334 ** The `default-directory' value doesn't have to end slash. To make
1335 that happen, `unhandled-file-name-directory' now defaults to calling
1336 `file-name-as-directory'.
1339 * Lisp Changes in Emacs 25.1
1342 *** New UPatterns `quote', `app', `cl-struct', `eieio', `seq', and `map'.
1343 *** New UPatterns can be defined with `pcase-defmacro'.
1345 *** New vector QPattern.
1348 ** syntax-propertize is now automatically called on-demand during forward
1349 parsing functions like `forward-sexp'.
1352 ** New hooks `prefix-command-echo-keystrokes-functions' and
1353 `prefix-command-preserve-state-hook' allow the definition of prefix
1354 commands other than the predefined `C-u'.
1357 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1358 These allow to convert between buffer positions and the corresponding
1359 file byte offsets, given the file's encoding.
1362 ** The default value of `load-read-function' is now `read'.
1363 Previously, the default value of `nil' implied using `read'.
1366 ** New hook `pre-redisplay-functions'.
1367 It is a bit easier to use than `pre-redisplay-function'.
1370 ** The second arg of `looking-back' should always be provided explicitly.
1371 Previously, it was an optional argument, now it's mandatory.
1374 ** Text properties `intangible', `point-entered', and `point-left' are obsolete.
1375 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1376 implemented by the new `cursor-intangible-mode' and
1377 `cursor-sensor-mode' minor modes.
1380 ** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
1381 Use the new minor modes `cursor-intangible-mode' and
1382 `cursor-sensor-mode' instead.
1385 ** New process type `pipe', which can be used in combination with the
1386 `:stderr' keyword of make-process to handle standard error output
1390 ** New function `make-process' provides an alternative interface to
1391 `start-process'. It allows programs to set process parameters such as
1392 process filter, sentinel, etc., through keyword arguments (similar to
1393 `make-network-process').
1396 ** A new function `directory-files-recursively' returns all matching
1397 files (recursively) under a directory.
1400 ** New variable `inhibit-message', when bound to non-nil, inhibits
1401 `message' and related functions from displaying messages in the echo
1402 area. The output is still logged to the *Messages* buffer.
1405 ** A new text property `inhibit-read-only' can be used in read-only
1406 buffers to allow certain parts of the text to be writable.
1409 ** A new variable `comment-end-can-be-escaped' is useful in languages
1410 such as C and C++ where line comments with escaped newlines are
1411 continued to the next line.
1414 ** New macro `define-advice'.
1417 ** Emacs Lisp now supports generators.
1418 See the "Generators" section of the ELisp manual for the details.
1421 ** New finalizer facility for running code when objects become unreachable.
1422 See the "Finalizer Type" subsection in the ELisp manual for the
1426 ** lexical closures can use (:documentation FORM) to build their docstring.
1427 It should be placed right where the docstring would be, and FORM is then
1428 evaluated (and should return a string) when the closure is built.
1431 ** define-inline provides a new way to define inlinable functions.
1434 ** New function `macroexpand-1' to perform a single step of macro expansion.
1437 ** Some "x-*" functions were obsoleted and/or renamed:
1438 *** x-select-text is renamed gui-select-text.
1439 *** x-selection-value is renamed gui-selection-value.
1440 *** x-get-selection is renamed gui-get-selection.
1441 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1442 *** x-get-selection-value is renamed to gui-get-primary-selection.
1443 *** x-set-selection is renamed to gui-set-selection
1446 ** New function `string-greaterp', which return the opposite result of
1450 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1451 preserve the collation order as defined by the system's locale(1)
1452 environment. For the time being this is implemented for modern POSIX
1453 systems and for MS-Windows, for other systems they fall back to their
1454 counterparts `string-lessp' and `string-equal'.
1457 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1458 If you want the old, locale-independent sorting, customize the new
1459 option `ls-lisp-use-string-collate' to a nil value.
1462 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1463 if set to a non-nil value, causes the above 2 functions to ignore
1464 symbol and punctuation characters when collating strings. This
1465 emulates the behavior of modern Posix platforms when the locale's
1466 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1467 MS-Windows doesn't support UTF-8 as codeset in its locales.
1470 ** New function `alist-get', which is also a valid place (aka lvalue).
1473 ** New function `funcall-interactively', which works like `funcall'
1474 but makes `called-interactively-p' treat the function as (you guessed it)
1475 called interactively.
1478 ** New function `function-put' to use instead of `put' for function properties.
1481 ** The new function `bidi-find-overridden-directionality' allows to
1482 find characters whose directionality was, perhaps maliciously,
1483 overridden by directional override control characters. Lisp programs
1484 can use this to detect potential phishing of URLs and other links that
1485 exploits bidirectional display reordering.
1488 ** The new function `buffer-substring-with-bidi-context' allows to
1489 copy a portion of a buffer into a different location while preserving
1490 the visual appearance both of the copied text and the text at
1491 destination, even when the copied text includes mixed bidirectional
1492 text and directional control characters.
1495 ** New properties that can be specified with `declare':
1496 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1497 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1498 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1502 ** New macro `with-file-modes', for evaluating expressions with default file
1503 permissions set to temporary values (e.g., for creating private files).
1506 ** You can access the slots of structures using `cl-struct-slot-value'.
1509 ** Function `sort' can deal with vectors.
1511 ** Function `system-name' now returns an updated value if the current
1512 system's name has changed or if the Emacs process has changed systems,
1513 and to avoid long waits it no longer consults DNS to canonicalize the
1514 name. The variable `system-name' is now obsolete.
1517 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1520 ** If `pwd' is called with a prefix argument, insert the current default
1524 ** New functions return extended information about fonts and faces.
1527 *** The function `font-info' now returns more details about a font.
1528 In particular, it now returns the average width of the font's
1529 characters, which can be used for geometry-related calculations.
1532 *** A new function `default-font-width' returns the average width of a
1533 character in the current buffer's default font. If the default face
1534 is remapped (see `face-remapping-alist'), the value for the remapped
1535 face is returned. This function complements the existing function
1536 `default-font-height'.
1539 *** New functions `window-font-height' and `window-font-width' return
1540 the height and average width of characters in a specified face and
1541 window. If FACE is remapped (see `face-remapping-alist'), the
1542 function returns the information for the remapped face.
1545 *** A new function `window-max-chars-per-line' returns the maximal
1546 number of characters that can be displayed on one line. If a face
1547 and/or window are provided, these values are used for the
1548 calculation. This function is different from `window-body-width' in
1549 that it accounts for (i) continuation glyphs, (ii) the size of the
1550 font, and (iii) the specified window.
1553 ** New utilities in subr-x.el:
1554 *** New macros `if-let' and `when-let' allow defining bindings and to
1555 execute code depending whether all values are true.
1556 *** New macros `thread-first' and `thread-last' allow threading a form
1557 as the first or last argument of subsequent forms.
1560 ** Documentation strings now support quoting with curved single quotes
1561 ‘like-this’ in addition to the old style with grave accent and
1562 apostrophe `like-this'. The new style looks better on today's displays.
1563 In the new Electric Quote mode, you can enter curved single quotes
1564 into documentation by typing ` and '. Outside Electric Quote mode,
1565 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1566 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1567 ‘text-quoting-style’, the user can specify how to display doc string
1571 ** New function ‘format-message’ is like ‘format’ and also converts
1572 curved single quotes, grave accents and apostrophes as per
1573 ‘text-quoting-style’.
1576 ** show-help-function's arg is converted via substitute-command-keys
1577 before being passed to the function. Help strings, help-echo
1578 properties, etc. can therefore contain command key escapes and
1582 ** Time-related changes:
1584 *** Time conversion functions now accept an optional ZONE argument
1585 that specifies the time zone rules for conversion. ZONE is omitted or
1586 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1587 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1588 rule. The affected functions are ‘current-time-string’,
1589 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1590 function ‘encode-time’, which already accepted a simple time zone rule
1591 argument, has been extended to accept all the new forms.
1593 *** Time-related functions now consistently accept numbers
1594 (representing seconds since the epoch) and nil (representing the
1595 current time) as well as the usual list-of-integer representation.
1596 Affected functions include `current-time-string', `current-time-zone',
1597 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1598 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1599 `time-to-days', and `time-to-seconds'.
1601 *** The `encode-time-value' and `with-decoded-time-value' macros have
1604 *** `calendar-next-time-zone-transition', `time-add', and
1605 `time-subtract' no longer return time values in the obsolete and
1606 undocumented integer-pair format. Instead, they return a list of two
1610 ** New function `set-binary-mode' allows to switch a standard stream
1611 of the Emacs process to binary I/O mode.
1614 ** The new function `directory-name-p' can be used to check whether a file
1615 name (as returned from, for instance, `file-name-all-completions') is
1616 a directory file name. It returns non-nil if the last character in
1617 the name is a directory separator character (forward slash on GNU and
1618 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1621 ** ASCII approximations to curved quotes are put in standard-display-table
1622 if the terminal cannot display curved quotes.
1625 ** Standard output and error streams now transliterate characters via
1626 standard-display-table, and encode output using locale-coding-system.
1627 To force a specific encoding, bind `coding-system-for-write' to the
1628 coding-system of your choice when invoking functions like `prin1' and
1632 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1635 ** New possible value for `system-type': `nacl'.
1636 This is used by Google's Native Client (NaCl).
1638 ** Miscellaneous name change
1641 For consistency with the usual Emacs spelling, the Lisp variable
1642 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1643 The old name should still work, as an obsolescent alias.
1645 ** Changes in Frame- and Window- Handling
1648 *** Emacs can now draw horizontal scroll bars on some platforms that
1649 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1650 Horizontal scroll bars are turned off by default.
1652 **** New function `horizontal-scroll-bars-available-p' telling whether
1653 horizontal scroll bars are available on the underlying system.
1655 **** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1656 bars on all existing and future frames.
1658 **** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1659 scroll bars on the selected frame.
1661 **** New frame parameters `horizontal-scroll-bars' and
1662 `scroll-bar-height' to set horizontal scroll bars and their height
1663 for individual frames and in `default-frame-alist'.
1665 **** New functions `frame-scroll-bar-height' and
1666 `window-scroll-bar-height' return the height of horizontal scroll
1667 bars on a specific frame or window.
1669 **** `set-window-scroll-bars' now accepts five parameters where the last
1670 two specify height and type of the window's horizontal scroll bar.
1672 **** `window-scroll-bars' now returns type and sizes of horizontal scroll
1675 **** New buffer-local variables `horizontal-scroll-bar' and
1676 `scroll-bar-height'.
1679 *** New functions `frame-geometry' and `frame-edges' give access to a
1683 *** New functions `mouse-absolute-pixel-position' and
1684 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1688 *** The function `window-edges' now accepts three additional arguments to
1689 retrieve body, absolute and pixel edges of the window.
1692 *** The functions `window-inside-edges', `window-inside-pixel-edges' and
1693 `window-inside-absolute-pixel-edges' have been renamed to respectively
1694 `window-body-edges', `window-body-pixel-edges' and
1695 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1698 *** New function `window-absolute-pixel-position' to get the screen
1699 coordinates of a visible buffer position.
1702 *** The height of a frame's menu and tool bar are no longer counted in the
1703 frame's text height. This means that the text height stands only for
1704 the height of the frame's root window plus that of the echo area (if
1705 present). This was already the behavior for frames with external tool
1706 and menu bars (like in the Gtk builds) but has now been extended to all
1710 *** Frames now do not necessarily preserve the number of columns or lines
1711 they display when setting default font, menu bar, fringe width, or
1712 scroll bars. In particular, maximized and fullscreen frames are
1713 conceptually never resized if such settings change. For fullheight and
1714 fullwidth frames, the behavior may depend on the toolkit used.
1715 **** New option `frame-inhibit-implied-resize' if non-nil, means that
1716 setting default font, menu bar, fringe width, or scroll bars of a
1717 specific frame does not resize that frame in order to preserve the
1718 number of columns or lines it displays.
1721 *** New function `window-preserve-size' allows to preserve the size of
1722 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1723 `temp-buffer-resize-mode' and `display-buffer'.
1726 *** New `display-buffer' action function `display-buffer-use-some-frame'.
1727 This displays the buffer in an existing frame other than the current
1728 frame, and allows the caller to specify a frame predicate to exclude
1732 *** New minor mode `window-divider-mode' and options
1733 `window-divider-default-places', `window-divider-default-bottom-width'
1734 and `window-divider-default-right-width'.
1737 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
1738 Those features have been deprecated in Gtk+ for a long time.
1743 *** etags no longer qualifies class members by default.
1745 By default, `etags' will not qualify class members for C-like
1746 object-oriented languages with their class names and namespaces, and
1747 will remove qualifications used explicitly in the code from the tag
1748 names it puts in TAGS files. This is so the etags.el back-end for
1749 `xref-find-definitions' is more accurate and produces less false
1752 Use --class-qualify (-Q) if you want the old default behavior of
1753 qualifying class members in C++, Java, and Objective C. Note that
1754 using -Q might make some class members become "unknown" to `M-.'
1755 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1756 qualified names by hand.
1759 *** New language Ruby
1761 Names of modules, classes, methods, and functions are tagged.
1762 Overloaded operators are also tagged.
1765 *** Improved support for Lua
1767 Etags now tags functions even if the "function" keyword follows some
1768 whitespace at line beginning.
1771 * Changes in Emacs 25.1 on Non-Free Operating Systems
1774 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1775 This includes the makefile.w32-in files in various subdirectories, and
1776 the support files. The file nt/configure.bat now just tells the user
1777 to use the procedure described in nt/INSTALL, by running the Posix
1778 `configure' script in the top-level directory.
1781 ** Building Emacs for MS-Windows requires at least Windows XP
1782 or Windows Server 2003. The built binaries still run on all versions
1783 of Windows starting with Windows 9X.
1786 ** Emacs running on MS-Windows now supports the daemon mode.
1789 ** The byte counts in etags-generated TAGS files are now the same on
1790 MS-Windows as they are on other platforms.
1793 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1794 Pass '--without-ns' to configure to create an X11 build, the old default.
1797 ** OS X 10.5 or older is no longer supported.
1800 ** OS X on PowerPC is no longer supported.
1803 ** New variable `ns-use-fullscreen-animation' controls animation for
1804 non-native NS fullscreen. The default is nil. Set to t to enable
1805 animation when entering and leaving fullscreen. For native OSX fullscreen
1809 ** The new function 'w32-application-type' returns the type of an
1810 MS-Windows application given the name of its executable program file.
1812 ** New variable `w32-pipe-buffer-size'.
1813 It can be used to tune the size of the buffer of pipes created for
1814 communicating with subprocesses, when the program run by a subprocess
1815 exhibits unusual buffering behavior. Default is zero, which lets the
1816 OS use its default size.
1819 ----------------------------------------------------------------------
1820 This file is part of GNU Emacs.
1822 GNU Emacs is free software: you can redistribute it and/or modify
1823 it under the terms of the GNU General Public License as published by
1824 the Free Software Foundation, either version 3 of the License, or
1825 (at your option) any later version.
1827 GNU Emacs is distributed in the hope that it will be useful,
1828 but WITHOUT ANY WARRANTY; without even the implied warranty of
1829 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1830 GNU General Public License for more details.
1832 You should have received a copy of the GNU General Public License
1833 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1839 paragraph-separate: "[
\f]*$"