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1 GNU Emacs NEWS -- history of user-visible changes.
2
3 Copyright (C) 2014-2015 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
5
6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 If possible, use M-x report-emacs-bug.
8
9 This file is about changes in Emacs version 25.
10
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.
14
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.
17
18 Temporary note:
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.
24
25 \f
26 * Installation Changes in Emacs 25.1
27
28 +++
29 ** Building Emacs now requires C99 or later.
30
31 +++
32 ** Building Emacs now requires GNU make, version 3.81 or later.
33
34 +++
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+.
38
39 ** New configure option --with-modules.
40 This enables support for loading dynamic modules; see below.
41
42 ---
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.
49
50 ---
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.
56
57 ---
58 ** 'configure' now prefers gnustep-config when configuring GNUstep.
59 If gnustep-config is not available, the old heuristics are used.
60
61 ---
62 ** 'configure' now prefers inotify to gfile for file notification,
63 unless gfile is explicitly requested via --with-file-notification='gfile'.
64
65 ---
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.
68
69 ---
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.
75
76 +++
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'.
81
82 ---
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.
88
89 ---
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.
93
94 ---
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.
98
99 \f
100 * Startup Changes in Emacs 25.1
101
102 +++
103 ** When Emacs is given a file as a command line argument and
104 `initial-buffer-choice' is non-nil, display both the file and
105 `initial-buffer-choice'. When Emacs is given more than one file and
106 `initial-buffer-choice' is non-nil, show `initial-buffer-choice'
107 and *Buffer List*. This makes Emacs convenient to use from the
108 command line when `initial-buffer-choice' is non-nil.
109
110 +++
111 ** The value of ‘initial-scratch-message’ is now treated as a doc string
112 and can contain escape sequences for command keys, quotes, and the like.
113
114 \f
115 * Changes in Emacs 25.1
116
117 +++
118 ** Any file of the form .dir-locals*.el is now considered a dir-local
119 file, and multiple such files can be used in the same directory. See
120 the variable `dir-locals-file' for more information.
121
122 ---
123 ** `xref-find-definitions' and `describe-function' now display
124 information about mode local overrides (defined by cedet/mode-local.el
125 `define-overloadable-function' `define-mode-local-overrides').
126
127 +++
128 ** New `display-buffer' action function `display-buffer-use-some-frame'.
129 This displays the buffer in an existing frame other than the current
130 frame, and allows the caller to specify a frame predicate to exclude
131 frames.
132
133 +++
134 ** New documentation command `describe-symbol'.
135 Works for functions, variables, faces, etc. It is bound to `C-h o' by
136 default.
137
138 +++
139 ** New function `custom-prompt-customize-unsaved-options' checks for
140 unsaved customizations and prompts user to customize (if found). It
141 is intended for adding to 'kill-emacs-query-functions'.
142
143 +++
144 ** Network security (TLS/SSL certificate validity and the like) is
145 added via the new Network Security Manager (NSM) and controlled via
146 the `network-security-level' variable.
147
148 +++
149 ** C-h l now also lists the commands that were run.
150
151 +++
152 ** x-select-enable-clipboard is renamed select-enable-clipboard
153 and x-select-enable-primary is renamed select-enable-primary.
154 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
155 name it), with the proviso that on some systems (e.g. Windows)
156 select-enable-primary is ineffective since the system doesn't
157 have the equivalent of a primary selection.
158
159 +++
160 ** terpri gets an optional arg ENSURE to conditionally output a newline.
161
162 +++
163 ** New macro `define-advice'.
164
165 +++
166 ** `insert-register' now leaves point after the inserted text
167 when called interactively. A prefix argument toggles this behavior.
168
169 +++
170 ** The new variable `term-file-aliases' replaces some files from lisp/term.
171 The function `tty-run-terminal-initialization' consults this variable
172 when deciding what terminal-specific initialization code to run.
173
174 ---
175 ** New variable `system-configuration-features', listing some of the
176 main features that Emacs was compiled with. This is mainly intended
177 for use in Emacs bug reports.
178
179 +++
180 ** A password is now hidden also when typed in batch mode. Another
181 hiding character but the default `.' can be used by let-binding the
182 variable `read-hide-char'.
183
184 ** A new function `directory-files-recursively' returns all matching
185 files (recursively) under a directory.
186
187 ** The new function `directory-name-p' can be used to check whether a file
188 name (as returned from, for instance, `file-name-all-completions' is
189 a directory file name. It returns non-nil if the last character in
190 the name is a forward slash.
191
192 ** The function `font-info' now returns more details about a font.
193 In particular, it now returns the average width of the font's
194 characters, which can be used for geometry-related calculations.
195
196 ** A new function `default-font-width' returns the average width of a
197 character in the current buffer's default font. If the default face
198 is remapped (see `face-remapping-alist'), the value for the remapped
199 face is returned. This function complements the existing function
200 `default-font-height'.
201
202 ** New functions `window-font-height' and `window-font-width' return
203 the height and average width of characters in a specified face and
204 window. If FACE is remapped (see `face-remapping-alist'), the
205 function returns the information for the remapped face.
206
207 ** A new function `window-max-chars-per-line' returns the maximal
208 number of characters that can be displayed on one line. If a face
209 and/or window are provided, these values are used for the
210 calculation. This function is different from `window-body-width' in
211 that it accounts for (i) continuation glyphs, (ii) the size of the
212 font, and (iii) the specified window.
213
214 ** New possible value for `system-type': nacl.
215
216 ** Emacs can now load shared/dynamic libraries (modules).
217 A dynamic Emacs module is a shared library that provides additional
218 functionality for use in Emacs Lisp programs, just like a package
219 written in Emacs Lisp would. The functions `load', `require',
220 `load-file', etc. were extended to load such modules, as they do with
221 Emacs Lisp packages. The new variable `module-file-suffix' holds the
222 system-dependent value of the file-name extension (`.so' on Posix
223 hosts) of the module files.
224
225 A module should export a C-callable function named
226 `emacs_module_init', which Emacs will call as part of the call to
227 `load' or `require' which loads the module. It should also export a
228 symbol named `plugin_is_GPL_compatible' to indicate that its code is
229 released under the GPL or compatible license; Emacs will refuse to
230 load modules that don't export such a symbol.
231
232 If a module needs to call Emacs functions, it should do so through the
233 API defined and documented in the header file `emacs-module.h'. Note
234 that any module that provides Lisp-callable functions will have to use
235 Emacs functions such as `fset' and `funcall', in order to register its
236 functions with the Emacs Lisp interpreter.
237
238 Modules can create `user-ptr' Lisp objects that embed pointers to C
239 struct's defined by the module. This is useful for keeping around
240 complex data structures created by a module, to be passed back to the
241 module's functions. User-ptr objects can also have associated
242 "finalizers" -- functions to be run when the object is GC'ed; this is
243 useful for freeing any resources allocated for the underlying data
244 structure, such as memory, open file descriptors, etc. A new
245 predicate `user-ptr-p' returns non-nil if its argument is a `usr-ptr'
246 object.
247
248 Loadable modules in Emacs are an experimental feature, and subject to
249 change in future releases. For that reason, their support is disabled
250 by default, and must be enabled by using the `--with-modules' option
251 at configure time.
252
253 ** New input method: `tamil-dvorak'.
254
255 \f
256 * Editing Changes in Emacs 25.1
257
258 +++
259 ** M-x suggests shorthands and ignores obsolete commands for completion.
260
261 ** Successive single-char deletions are collapsed in the undo-log just like
262 successive char insertions. This behaviour can be extended to other
263 commands, using the `undo-auto--amalgamate' function.
264
265 ** The heuristic used to insert `undo-boundary' after each command has changed,
266 so that it supports commands which potentially affect multiple buffers.
267
268 +++
269 ** New command `comment-line' bound to `C-x C-;'.
270
271 ** Unicode names entered via C-x 8 RET now use substring completion by default.
272
273 ** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
274 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
275
276 ** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
277 as you type. See also the new variable ‘text-quoting-style’.
278
279 ** New minor mode global-eldoc-mode is enabled by default.
280
281 ** Emacs now supports "bracketed paste mode" when running on a terminal
282 that supports it. This facility allows Emacs to understand pasted
283 chunks of text as strings to be inserted, instead of interpreting each
284 character in the pasted text as actual user input. This results in a
285 paste experience similar to that under a window system, and significant
286 performance improvements when pasting large amounts of text.
287
288 ** Emacs now supports the latest version of the UBA.
289 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
290 was updated to support all the latest additions and changes introduced
291 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
292 This includes full support for directional isolates and the
293 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
294 standards.
295
296 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
297
298 +++
299 ** New buffer-local `electric-pair-local-mode'.
300
301 +++
302 ** New variable `fast-but-imprecise-scrolling' inhibits
303 fontification during full screen scrolling operations, giving less
304 hesitant operation during auto-repeat of C-v, M-v at the cost of
305 possible inaccuracies in the end position.
306
307 \f
308 * Changes in Specialized Modes and Packages in Emacs 25.1
309
310 ** Checkdoc
311
312 +++
313 *** New command `checkdoc-package-keywords' checks if the
314 current package keywords are recognized. Set the new option
315 `checkdoc-package-keywords-flag' to non-nil to make
316 `checkdoc-current-buffer' call this function automatically.
317
318 +++
319 *** New function `checkdoc-file' checks for style errors.
320 It's meant for use together with `compile':
321 emacs -batch --eval "(checkdoc-file \"subr.el\")"
322
323 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
324 It raises an error if a bookmark of that name already exists,
325 unlike `bookmark-set' which silently updates an existing bookmark.
326
327 ** JSON
328 ---
329 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
330 the ordering of object keys by default.
331 ---
332 *** New commands `json-pretty-print-ordered' and
333 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
334 object keys sorted alphabetically.
335
336 ** You can recompute the VC state of a file buffer with `M-x vc-refresh-state'
337 ** Prog mode has some support for multi-mode indentation.
338 See `prog-indentation-context' and `prog-widen'.
339
340 ** Prettify Symbols mode
341 *** Prettify Symbols mode supports custom composition predicates. By
342 overriding the default `prettify-symbols-compose-predicate', modes can
343 specify in which contexts a symbol map be composed to some unicode
344 character. `prettify-symbols-default-compose-p' is the default which
345 is suitable for most programming languages such as C or Lisp (but not
346 (La)TeX).
347
348 *** Symbols can be unprettified while point is inside them.
349 New variable `prettify-symbols-unprettify-at-point' configures this.
350
351 ** New `xterm-screen-extra-capabilities' config.
352
353 ** The `save-place' variable is replaced by a `save-place-mode'.
354
355 ** ERC
356
357 *** Hide message types by network or channel. `erc-hide-list' will
358 hide all messages of the specified type, where `erc-network-hide-list'
359 and `erc-channel-hide-list' will only hide the specified message types
360 for the respective specified targets.
361
362 ** Midnight-mode
363 *** `midnight-mode' is a proper minor mode.
364 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
365
366 ** In xterms, killing text now also sets the CLIPBOARD/PRIMARY selection
367 in the surrounding GUI (using the OSC-52 escape sequence). This only works
368 if your xterm supports it and enables the `allowWindowOps' options (disabled
369 by default at least in Debian, for security reasons).
370
371 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
372 escape sequence) if your xterm has the feature enabled but for that you
373 additionally need to add `getSelection' to `xterm-extra-capabilities'.
374
375 ** xterm-mouse-mode now supports mouse-tracking (if your xterm supports it).
376
377 ** package.el
378
379 *** New "external" package status.
380 An external package is any installed package that's not built-in and
381 not from `package-user-dir', which usually means it's from an entry in
382 `package-directory-list'. They are treated much like built-in
383 packages, in that they cannot be deleted through the package menu and
384 are not considered for upgrades.
385
386 The effect, is that a user can manually place a specific version of a
387 package inside `package-directory-list' and the package menu will
388 always respect that.
389
390 *** If a package is available on multiple archives and one has higher
391 priority (as per `package-archive-priorities') only that one is
392 listed. This can be configured with `package-menu-hide-low-priority'.
393
394 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
395 This includes the above-mentioned low-priority packages, as well as
396 available packages whose version is lower than the currently installed
397 version (which were previously impossible to display).
398 This allows users to downgrade a package if a lower version is
399 available.
400
401 *** When filtering the package menu, keywords starting with "arc:" or
402 "status:" represent package archive or status, respectively, instead
403 of actual keywords.
404
405 *** Most functions which involve downloading information now take an
406 ASYNC argument. If it is non-nil, package.el performs the download(s)
407 asynchronously.
408
409 *** New variable `package-menu-async' controls whether the
410 package-menu uses asynchronous downloads.
411
412 *** `package-install-from-buffer' and `package-install-file' work on directories.
413 This follows the same rules as installing from a .tar file, except the
414 -pkg file is optional.
415
416 *** Packages which are dependencies of other packages cannot be deleted.
417 The FORCE argument to `package-delete' overrides this.
418
419 *** New custom variable `package-selected-packages' tracks packages
420 which were installed by the user (as opposed to installed as
421 dependencies). This variable can also be manually customized.
422
423 *** New command `package-install-user-selected-packages' installs all
424 packages from `package-selected-packages' which are currently missing.
425
426 *** New command `package-autoremove' removes all packages which were
427 installed strictly as dependencies but are no longer needed.
428
429 ** Shell
430
431 When you invoke `shell' interactively, the *shell* buffer will now
432 display in a new window. However, you can customize this behavior via
433 the `display-buffer-alist' variable. For example, to get
434 the old behavior -- *shell* buffer displays in current window -- use
435 (add-to-list 'display-buffer-alist
436 '("^\\*shell\\*$" . (display-buffer-same-window))).
437
438 ** EIEIO
439 +++
440 *** The `:protection' slot option is not obeyed any more.
441 +++
442 *** The `newname' argument to constructors is optional&deprecated.
443 If you need your objects to be named, do it by inheriting from `eieio-named'.
444 +++
445 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
446 +++
447 *** The <class> variables are declared obsolete.
448 +++
449 *** The <initarg> variables are declared obsolete.
450 *** defgeneric and defmethod are declared obsolete.
451 +++
452 *** `constructor' is now an obsolete alias for `make-instance'.
453
454 ** ido
455 *** New command `ido-bury-buffer-at-head' bound to C-S-b
456 Bury the buffer at the head of `ido-matches', analogous to how C-k
457 kills the buffer at head.
458 *** A prefix argument to `ido-restrict-to-matches' will reverse its
459 meaning, and the list is restricted to those elements that do not
460 match the current input.
461
462 ** Minibuffer
463
464 *** You can use <up> and <down> keys to move point in the multi-line
465 minibuffer just as in an ordinary buffer. Only when point moves over
466 the bottom/top of the minibuffer it goes to the next/previous history
467 element. The new commands bound to <up> and <down> in the minibuffer:
468 `next-line-or-history-element' and `previous-line-or-history-element'.
469
470 ** Search and Replace
471
472 +++
473 *** New user option `search-default-regexp-mode'
474 specifies the default mode for I-search.
475
476 +++
477 *** `isearch' and `query-replace' can now perform character folding in matches.
478 Isearch does that by default, while `query-replace' will do that if
479 the new variable `replace-character-fold' is customized to a non-nil
480 value. This is analogous to case folding, but instead of disregarding
481 case variants, it disregards wider classes of distinctions between
482 similar characters. (Case folding is a special case of character
483 folding.) This means many characters in the search string will match
484 entire groups of characters instead of just themselves.
485
486 For instance, the " will match all variants of double quotes (like “
487 and ”), and the letter a will match all of its accented cousins, even
488 those composed of multiple characters, as well as many other symbols
489 like ℀, ℁, ⒜, and ⓐ.
490
491 +++
492 *** New function `character-fold-to-regexp' can be used
493 by searching commands to produce a regexp matching anything that
494 character-folds into STRING.
495
496 +++
497 *** The new M-s M-w key binding uses eww to search the web for the
498 text in the region. The search engine to use for this is specified by
499 the customizable variable `eww-search-prefix'.
500
501 +++
502 *** Query-replace history is enhanced.
503 When query-replace reads the FROM string from the minibuffer, typing
504 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
505 and TO are the original text and its replacement, and SEP is an arrow
506 string defined by the new variable `query-replace-from-to-separator'.
507 To select a prior replacement, type `M-p' until the desired
508 replacement appears in the minibuffer, and then exit the minibuffer by
509 typing RET.
510
511 ** Calc
512 +++
513 *** If `quick-calc' is called with a prefix argument, insert the
514 result of the calculation into the current buffer.
515
516 +++
517 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
518 this you can tell Edebug not to stop at the start of the first
519 instrumented function.
520
521 ** ElDoc
522 *** New minor mode `global-eldoc-mode'
523 *** `eldoc-documentation-function' now defaults to `ignore'
524 *** `describe-char-eldoc' displays information about character at point,
525 and can be used as a default value of `eldoc-documentation-function'. It is
526 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
527 ] [, ] [, etc.) while using mono-spaced font.
528
529 ** eww
530
531 ---
532 *** HTML can now be rendered using variable-width fonts.
533
534 +++
535 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
536 whether to use variable-pitch fonts or not. The user can also
537 customize the `shr-use-fonts' variable.
538
539 +++
540 *** A new command `R' (`eww-readable') will try do identify the main
541 textual parts of a web page and display only that, leaving menus and
542 the like off the page.
543
544 ---
545 *** You can now use several eww buffers in parallel by renaming eww
546 buffers you want to keep separate.
547
548 +++
549 *** Partial state of the eww buffers (the URIs and the titles of the
550 pages visited) is now preserved in the desktop file.
551
552 +++
553 *** `eww-after-render-hook' is now called after eww has rendered
554 the data in the buffer.
555
556 ---
557 *** The `eww-reload' command now takes a prefix to not reload via
558 the net, but just use the local copy of the HTML.
559
560 +++
561 *** The DOM shr and eww uses has been changed to the general Emacs
562 xml.el/libxml2 DOM, and a new package dom.el has been added to
563 interact with this DOM. See the Emacs Lisp manual for interface
564 details.
565
566 +++
567 *** `mailcap-mime-data' is now consulted when displaying PDF files.
568
569 +++
570 *** The new `S' command will list all eww buffers, and allow managing
571 them.
572
573 ---
574 *** https pages with valid certificates have headers marked in green, while
575 invalid certificates are marked in red.
576
577 ** Message mode
578
579 *** text/html messages that contain inline image parts will be
580 transformed into multipart/related messages before sending.
581
582 ** pcase
583 *** New UPatterns `quote', `app', `cl-struct', and `eieio'.
584 *** New UPatterns can be defined with `pcase-defmacro'.
585 +++
586 *** New vector QPattern.
587
588 ** Lisp mode
589 *** Strings after `:documentation' are highlighted as docstrings.
590
591 ** Rectangle editing
592 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
593 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
594 *** `string-rectangle' provides on-the-fly preview of the result.
595
596 ** New font-lock functions font-lock-ensure and font-lock-flush, which
597 should be used instead of font-lock-fontify-buffer when called from Elisp.
598
599 ** Macro `minibuffer-with-setup-hook' takes (:append FUN) to mean
600 appending FUN to `minibuffer-setup-hook'.
601
602 ** cl-lib
603 *** New functions cl-fresh-line, cl-digit-char-p and cl-parse-integer.
604
605 ** Calendar and diary
606
607 +++
608 *** The default `diary-file' is now located in .emacs.d.
609
610 +++
611 *** New commands to insert diary entries with Chinese dates:
612 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
613 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
614
615 +++
616 *** The calendar can now list and mark diary entries with Chinese dates.
617 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
618
619 ---
620 *** The option `calendar-mode-line-format' can now be nil,
621 which means to do nothing special with the mode line in calendars.
622
623 +++
624 *** New option `calendar-weekend-days'.
625 The option customizes which day headers receive the
626 `calendar-weekend-header' face.
627
628 ---
629 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
630
631 ---
632 *** Many items obsolete since at least version 23.1 have been removed.
633 The majority were function/variable/face aliases, too numerous to list here.
634 The remainder were:
635
636 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
637 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
638
639 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
640
641 **** Macro `calendar-for-loop'.
642
643 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
644
645 **** The nil and list forms of `diary-display-function'.
646
647 ** New ERT function `ert-summarize-tests-batch-and-exit'.
648
649 ** New js.el option `js-indent-first-init'.
650
651 ---
652 ** `Info-fontify-maximum-menu-size' can be t for no limit.
653
654 +++
655 ** `info-display-manual' can now be given a prefix argument which (any
656 non-nil value) directs the command to limit the completion
657 alternatives to currently visited manuals.
658
659 ---
660 ** ntlm.el has support for NTLM2.
661
662 ** Rmail
663
664 *** The Rmail commands d, C-d and u take optional repeat counts to delete or
665 undelete multiple messages.
666
667 *** Rmail can now render HTML mail messages if your Emacs was built with
668 libxml2 or if you have the Lynx browser installed. By default, Rmail
669 will display the HTML version of a mail message that has both HTML and
670 plain text parts, if display of HTML email is possible; customize the
671 `rmail-mime-prefer-html' option to `nil' if you don't want that.
672
673 +++
674 *** In the commands that make summaries by subject, recipients, or senders,
675 you can no longer use commas to separate regular expressions.
676
677 ** SES now supports local printer functions; see `ses-define-local-printer'.
678
679 ** sh-script
680 *** In sh-mode you can now use `sh-shell' as a file-local variable to
681 specify the type of shell in use (bash, csh, etc).
682
683 *** New value `always' for sh-indent-after-continuation.
684 This provides old-style ("dumb") indentation of continued lines.
685
686 ** TLS
687 ---
688 *** Fatal TLS errors are now silent by default.
689
690 ** URL
691
692 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
693 When `url-handler-mode' is enabled, file operations for these
694 protocols as well as for "telnet" and "ftp" are passed to Tramp.
695
696 *** The URL package allows customizing the `url-user-agent' string.
697 The new `url-user-agent' variable can be customized to be a string or
698 a function.
699
700 *** The new interface variable `url-request-noninteractive' can be used
701 to specify that we're running in a noninteractive context, and that
702 we should not be queried about things like TLS certificate validity.
703
704 *** If URL is used with a https connection, the first callback argument
705 plist will contain a :peer element that has the output of
706 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
707
708 ** Tramp
709
710 +++
711 *** New connection method "afp", which allows to access Mac OS X
712 volumes via the Apple Filing Protocol.
713
714 +++
715 *** New connection method "nc", which allows to access dumb busyboxes.
716
717 +++
718 *** Method-specific parameters can be overwritten now with variable
719 `tramp-connection-properties'.
720
721 ---
722 *** Handler for `file-notify-valid-p' for remote machines that support
723 filesystem notifications.
724
725 ** SQL mode
726
727 *** New user variable `sql-default-directory' enables remote
728 connections using Tramp.
729
730 *** New command `sql-send-line-and-next' sends the current line to the
731 interactive buffer and advances to the next line, skipping whitespace
732 and comments.
733
734 *** Add support for Vertica SQL.
735
736 ** VC and related modes
737
738 *** Basic push support, via `vc-push', bound to `C-x v P'.
739 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
740 (undocumented) command vc-hg-push now behaves slightly differently.
741
742 *** The new command vc-region-history shows the log+diff of the active region.
743
744 *** New option `vc-annotate-background-mode' controls whether
745 the color range from `vc-annotate-color-map' is applied to the
746 background or to the foreground.
747
748 *** `compare-windows' now compares text with the most recently used window
749 instead of the next window. The new option `compare-windows-get-window-function'
750 allows to customize this.
751
752 *** Two new faces `compare-windows-removed' and `compare-windows-added'
753 replace the obsolete face `compare-windows'.
754
755 ---
756 *** `log-edit-insert-changelog' converts "(tiny change)" to
757 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
758 nil to disable this.
759
760 ** VHDL mode supports VHDL'08.
761
762 ** Calculator: decimal display mode uses "," groups, so it's more
763 fitting for use in money calculations; factorial works with
764 non-integer inputs.
765
766 ** HideIfDef mode now support full C/C++ expressions, argumented macro expansions,
767 interactive macro evaluation and automatic scanning of #defined symbols.
768
769 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header file
770 name patterns. Default case-insensitive .h, .hh, .hpp, .hxx, and .h++.
771 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
772 reinclusion protected header files from being fully hidden.
773 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
774 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be excluded.
775
776 ** TeX mode
777
778 *** New custom variable `tex-print-file-extension' to help users who
779 use PDF instead of DVI.
780
781 *** TeX mode now supports Prettify Symbols mode. When enabling
782 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
783 many other math macros are displayed using unicode characters.
784
785 ** whitespace-mode: new 'big-indent style highlighting too much indentation.
786 By default, 32 spaces and four TABs are considered to be too much but
787 `whitespace-big-indent-regexp' can be configured to change that.
788
789 ** tildify: `tildify-space-string', `tildify-pattern', and
790 `tildify-foreach-region-function' variables added making
791 `tildify-string-alist', `tildify-pattern-alist', and
792 `tildify-ignored-environments-alist' variables (as well as a few
793 helper functions) obsolete.
794
795 ** xref
796 The new package provides generic framework and new commands to find
797 and move to definitions, as well as pop back to the original location.
798
799 *** New key bindings
800 `xref-find-definitions' replaces `find-tag' and provides an interface
801 to pick one destination among several. Hence, `tags-loop-continue' is
802 unbound. `xref-pop-marker-stack' replaces `pop-tag-mark', but uses an
803 easier binding, which is now unoccupied (`M-,').
804 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
805 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
806 `xref-find-apropos' replaces `find-tag-regexp'.
807
808 *** New variables
809 `find-tag-marker-ring-length' is now an obsolete alias for
810 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
811 alias for a private variable. `xref-push-marker-stack' and
812 `xref-pop-marker-stack' should be used to mutate it instead.
813
814 ** etags
815 As a result of the above, these commands are now obsolete:
816 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
817 `tags-apropos' and `tags-loop-continue'.
818
819 ** EUDC
820 EUDC's LDAP backend has been improved.
821
822 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
823
824 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
825 subprocess instead of on the command line.
826
827 *** EUDC handles LDAP wildcards automatically so the user shouldn't
828 need to configure this manually anymore.
829
830 *** The LDAP configuration section of EUDC's manual has been
831 rewritten.
832
833 There have also been customization changes.
834
835 *** New custom variable `eudc-server-hotlist' to allow specifying
836 multiple EUDC servers in init file.
837
838 *** Custom variable `eudc-inline-query-format' defaults to completing
839 on email and firstname instead of surname.
840
841 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
842 to avoid interfering with the kill ring.
843
844 *** Custom variable `eudc-inline-expansion-format' defaults to
845 "Firstname Surname <mail-address>".
846
847 *** Custom variable `eudc-options-file' defaults to
848 "~/.emacs.d/eudc-options".
849
850 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
851 allow overriding the regular expression that recognizes the ldapsearch
852 command line's password prompt.
853
854 EUDC's BBDB backend now supports BBDB 3.
855
856 ** Eshell
857
858 +++
859 *** The new built-in command `clear' can scroll window contents out of sight.
860 If provided with an optional non-nil argument, the scrollback contents will be cleared.
861
862 *** New buffer syntax '#<buffer-name>', which is equivalent to
863 '#<buffer buffer-name>'. This shorthand makes interacting with
864 buffers from eshell more convenient. Custom variable
865 `eshell-buffer-shorthand', which has been broken for a while, has been
866 removed.
867
868 *** By default, eshell "visual" program buffers (created by
869 `eshell-visual-commands' and similar custom vars) are no longer killed
870 when their processes die. This fixes issues with short-lived commands
871 and makes visual programs more useful in general. For example, if
872 "git log" is a visual command, it will always show the visual command
873 buffer, even if the "git log" process dies. For the old behavior,
874 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
875
876 ** Browse-url
877
878 *** Support for the Conkeror web browser.
879
880 ---
881 *** Support for several ancient browsers is now officially obsolete.
882
883 +++
884 ** tar-mode: new `tar-new-entry' command, allowing for new members to
885 be added to the archive.
886
887 ---
888 ** Autorevert: dired buffers are also auto-reverted via file
889 notifications, if Emacs is compiled with file notification support.
890
891 ** File Notifications
892
893 +++
894 *** The new event `stopped' signals, that a file notification watch is
895 not active any longer.
896
897 +++
898 *** The new function `file-notify-valid-p' checks, whether a file
899 notification descriptor still corresponds to an activate watch.
900
901 ** Dired
902
903 +++
904 *** The command `dired-do-compress' bound to `Z' now can compress
905 directories and decompress zip files.
906
907 +++
908 *** New command `dired-do-compress-to' bound to `c' can be used to
909 compress many marked files into a single named archive. The
910 compression command is determined from the new
911 `dired-compress-files-alist' variable.
912
913 ** Tabulated List Mode
914
915 +++
916 *** It is now safe for a mode that derives `tabulated-list-mode' to not
917 call `tabulated-list-init-header', in which case it will have no
918 header.
919
920 +++
921 *** `tabulated-list-print' takes a second optional argument, update,
922 which specifies an alternative printing method which is faster when
923 few or no entries have changed.
924
925 ** Obsolete packages
926
927 ---
928 *** gulp.el
929
930 *** landmark.el (moved to elpa.gnu.org)
931
932 \f
933 * New Modes and Packages in Emacs 25.1
934
935 ** pinentry.el allows GnuPG passphrase to be prompted through the
936 minibuffer instead of a graphical dialog, depending on whether the gpg
937 command is called from Emacs (i.e., INSIDE_EMACS environment variable
938 is set). This feature requires newer versions of GnuPG (2.1.5 or
939 later) and Pinentry (0.9.5 or later).
940
941 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
942
943 ** scss-mode (a minor variant of css-mode)
944
945 ** let-alist is a new macro (and a package) that allows one to easily
946 let-bind the values stored in an alist.
947
948 ** `tildify-mode' allows to automatically insert hard spaces as one
949 types the text. Breaking line after a single-character words is
950 forbidden by Czech and Polish typography (and may be discouraged in
951 other languages), so `auto-tildify-mode' makes it easier to create
952 a typographically-correct documents.
953
954 ** The `seq' library adds sequence manipulation functions and macros
955 that complement basic functions provided by subr.el. All functions
956 are prefixed with `seq-' and work on lists, strings and vectors.
957
958 ** The `map' library provides map-manipulation functions that work on
959 alists, hash-table and arrays. All functions are prefixed with
960 `map-'.
961
962 ** The `thunk' library provides functions and macros to control the
963 evaluation of forms.
964
965 ** js-jsx-mode (a minor variant of js-mode) provides indentation
966 support for JSX, an XML-like syntax extension to ECMAScript.
967
968 \f
969 * Incompatible Lisp Changes in Emacs 25.1
970
971 ---
972 ** `setq' and `setf' must now be called with an even number of
973 arguments. The earlier behavior of silently supplying a nil to the
974 last variable when there was an odd number of arguments has been
975 eliminated.
976
977 ** `syntax-begin-function' is declared obsolete.
978 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
979 slot in font-lock-defaults.
980
981 +++
982 ** `package-initialize' now sets `package-enable-at-startup' to nil if
983 called during startup. Users who call this function in their init
984 file and still expect it to be run after startup should set
985 `package-enable-at-startup' to t after the call to
986 `package-initialize'.
987
988 ** `:global' minor mode use `setq-default' rather than `setq'.
989 This means that you can't use `make-local-variable' and expect them to
990 "magically" become buffer-local.
991
992 ** `inhibit-point-motion-hooks' now defaults to t and is obsolete.
993
994 +++
995 ** `track-mouse' no longer freezes the shape of the mouse pointer.
996 The `track-mouse' form no longer refrains from changing the shape of
997 the mouse pointer for the entire time the body of that form is
998 executed. Lisp programs that use `track-mouse' for dragging across
999 large portions of the Emacs display, and want to avoid changes in the
1000 pointer shape during dragging, should bind the variable `track-mouse'
1001 to the special value `dragging' in the body of the form.
1002
1003 ---
1004 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1005 has any effect. (This change was made in Emacs 24.4 but was not
1006 advertised at the time.)
1007
1008 ** `indirect-function' does not signal `void-function' any more.
1009 This is mostly a bug-fix, since this change was missed back in 24.4 when
1010 symbol-function was changed not to signal `void-function' any more.
1011
1012 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1013
1014 ** Comint, term, and compile do not set the EMACS env var any more.
1015 Use the INSIDE_EMACS environment variable instead.
1016
1017 ** `save-excursion' does not save&restore the mark any more.
1018
1019 ** read-buffer-function can now be called with a 4th argument (`predicate').
1020
1021 ** completion-table-dynamic stays in the minibuffer.
1022 If you want the old behavior of calling the function in the buffer
1023 from which the minibuffer was entered, call it with the new argument
1024 `switch-buffer'.
1025
1026 ** window-configurations no longer record the buffers' marks.
1027
1028 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1029 active region handling.
1030
1031 ** deactivate-mark is now buffer-local.
1032
1033 ** `cl-the' now asserts that its argument is of the given type.
1034
1035 ** `process-running-child-p` may now return a numeric process
1036 group ID instead of `t'.
1037
1038 +++
1039 ** Mouse click events on mode line or header line no longer include
1040 any reference to a buffer position. The 6th member of the mouse
1041 position list returned for such events is now nil.
1042
1043 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1044 These slots used to hold key-shortcut data, but have been obsolete since
1045 Emacs-21.
1046
1047 ** Emacs no longer downcases the first letter of a system diagnostic
1048 when signaling a file error. For example, it now reports "Permission
1049 denied" instead of "permission denied". The old behavior was problematic
1050 in languages like German where downcasing rules depend on grammar.
1051
1052 +++
1053 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1054 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1055 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1056 and apostrophe `like this'. The default value nil acts like ‘curve’
1057 if curved single quotes are displayable, and like ‘grave’ otherwise.
1058 The new variable affects display of diagnostics and help, but not of info.
1059
1060 +++
1061 ** substitute-command-keys now replaces quotes.
1062 That is, it converts documentation strings’ quoting style as per the
1063 value of ‘text-quoting-style’. Doc strings in source code can use
1064 either curved single quotes or grave accents and apostrophes. As
1065 before, characters preceded by \= are output as-is.
1066
1067 +++
1068 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1069 They use the new ‘format-message’ function instead of plain ‘format’,
1070 so that they now follow user preference as per ‘text-quoting-style’
1071 when processing curved single quotes, grave accents, and apostrophes
1072 in their format argument.
1073
1074 +++
1075 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1076 now match multibyte characters using Unicode character properties.
1077 If you want the old behavior where they matched any character with
1078 word syntax, use `\sw' instead.
1079
1080 +++
1081 ** The character classes [:graph:] and [:print:] in regular expressions
1082 no longer match every multibyte character. Instead, Emacs now
1083 consults the Unicode character properties to determine which
1084 characters are graphic or printable. In particular, surrogates and
1085 unassigned codepoints are now rejected. If you want the old behavior,
1086 use [:multibyte:] instead.
1087
1088 +++
1089 ** The `diff' command uses the unified format now. To restore the old
1090 behavior, set `diff-switches' to `-c'.
1091
1092 ** `grep-template' and `grep-find-template' values don't include the
1093 --color argument anymore. It's added at the <C> place holder position
1094 dynamically. Any third-party code that changes these templates should
1095 be updated accordingly.
1096
1097 +++
1098 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1099 The new behavior is compatible with Common Lisp and with XEmacs.
1100 This change does not affect Lisp code intended to be portable to
1101 Emacs 24.2 and earlier, which did not support unary ‘/’.
1102
1103 +++
1104 ** The `default-directory' value doesn't have to end slash. To make
1105 that happen, `unhandled-file-name-directory' now defaults to calling
1106 `file-name-as-directory'.
1107
1108 \f
1109 * Lisp Changes in Emacs 25.1
1110
1111 ** syntax-propertize is now automatically called on-demand during forward
1112 parsing functions like `forward-sexp'.
1113
1114 ** New hooks prefix-command-echo-keystrokes-functions and
1115 prefix-command-preserve-state-hook, to allow the definition of prefix
1116 commands other than the predefined C-u.
1117
1118 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1119
1120 ** The default value of `load-read-function' is now `read'.
1121
1122 ** New hook `pre-redisplay-functions', a bit easier to use than pre-redisplay-function.
1123
1124 ** The second arg of `looking-back' should always be provided explicitly.
1125
1126 ** Obsolete text properties `intangible', `point-entered', and `point-left'.
1127 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1128 implemented by the new `cursor-intangible-mode' and
1129 `cursor-sensor-mode' minor modes.
1130
1131 ** New process type `pipe', which can be used in combination with the
1132 `:stderr' keyword of make-process to handle standard error output
1133 of subprocess.
1134
1135 ** New function `make-process' provides an alternative interface to
1136 `start-process'. It allows programs to set process parameters such as
1137 process filter, sentinel, etc., through keyword arguments (similar to
1138 `make-network-process').
1139
1140 +++
1141 ** New variable `inhibit-message', when bound to non-nil, inhibits
1142 `message' and related functions from displaying messages the Echo
1143 Area. The output is still logged to the *Messages* buffer.
1144
1145 +++
1146 ** A new text property `inhibit-read-only' can be used in read-only
1147 buffers to allow certain parts of the text to be writable.
1148
1149 ** `read-buffer' takes a new `predicate' argument.
1150
1151 ** Emacs Lisp now supports generators.
1152
1153 ** New finalizer facility for running code when objects
1154 become unreachable.
1155
1156 ** lexical closures can use (:documentation <form>) to build their docstring.
1157 It should be placed right where the docstring would be, and <form> is then
1158 evaluated (and should return a string) when the closure is built.
1159
1160 ** define-inline provides a new way to define inlinable functions.
1161
1162 ** New function `macroexpand-1' to perform a single step of macroexpansion.
1163
1164 ** Some "x-*" were obsoleted:
1165 *** x-select-text is renamed gui-select-text.
1166 *** x-selection-value is renamed gui-selection-value.
1167 *** x-get-selection is renamed gui-get-selection.
1168 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1169 *** x-get-selection-value is renamed to gui-get-primary-selection.
1170 *** x-set-selection is renamed to gui-set-selection
1171
1172 ** New function `string-greaterp', which return the opposite result of
1173 `string-lessp'.
1174
1175 +++
1176 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1177 preserve the collation order as defined by the system's locale(1)
1178 environment. For the time being this is implemented for modern POSIX
1179 systems and for MS-Windows, for other systems they fall back to their
1180 counterparts `string-lessp' and `string-equal'.
1181
1182 ---
1183 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1184 If you want the old, locale-independent sorting, customize the new
1185 option `ls-lisp-use-string-collate' to a nil value.
1186
1187 +++
1188 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1189 if set to a non-nil value, causes the above 2 functions to ignore
1190 symbol and punctuation characters when collating strings. This
1191 emulates the behavior of modern Posix platforms when the locale's
1192 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1193 MS-Windows doesn't support UTF-8 as codeset in its locales.
1194
1195 ** New function `alist-get', which is also a valid place (aka lvalue).
1196
1197 ** New function `funcall-interactively', which works like `funcall'
1198 but makes `called-interactively-p' treat the function as (you guessed it)
1199 called interactively.
1200
1201 ** New function `function-put' to use instead of `put' for function properties.
1202
1203 +++
1204 ** The new function `bidi-find-overridden-directionality' allows to
1205 find characters whose directionality was, perhaps maliciously,
1206 overridden by directional override control characters. Lisp programs
1207 can use this to detect potential phishing of URLs and other links that
1208 exploits bidirectional display reordering.
1209
1210 +++
1211 ** The new function `buffer-substring-with-bidi-context' allows to
1212 copy a portion of a buffer into a different location while preserving
1213 the visual appearance both of the copied text and the text at
1214 destination, even when the copied text includes mixed bidirectional
1215 text and directional control characters.
1216
1217 +++
1218 ** New properties that can be specified with `declare':
1219 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1220 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1221 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1222 have side effects.
1223
1224 +++
1225 ** New macro `with-file-modes', for evaluating expressions with default file
1226 permissions set to temporary values (e.g., for creating private files).
1227
1228 ** You can access the slots of structures using `cl-struct-slot-value'.
1229
1230 ** Function `sort' can deal with vectors.
1231
1232 ** Function `system-name' now returns an updated value if the current
1233 system's name has changed or if the Emacs process has changed systems,
1234 and to avoid long waits it no longer consults DNS to canonicalize the
1235 name. The variable `system-name' is now obsolete.
1236
1237 +++
1238 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1239
1240 ** If `pwd' is called with a prefix argument, insert the current default
1241 directory at point.
1242
1243 ---
1244 ** New utilities in subr-x.el:
1245 *** New macros `if-let' and `when-let' allow defining bindings and to
1246 execute code depending whether all values are true.
1247 *** New macros `thread-first' and `thread-last' allow threading a form
1248 as the first or last argument of subsequent forms.
1249
1250 +++
1251 ** Documentation strings now support quoting with curved single quotes
1252 ‘like-this’ in addition to the old style with grave accent and
1253 apostrophe `like-this'. The new style looks better on today's displays.
1254 In the new Electric Quote mode, you can enter curved single quotes
1255 into documentation by typing ` and '. Outside Electric Quote mode,
1256 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1257 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1258 ‘text-quoting-style’, the user can specify how to display doc string
1259 quotes.
1260
1261 +++
1262 ** New function ‘format-message’ is like ‘format’ and also converts
1263 curved single quotes, grave accents and apostrophes as per
1264 ‘text-quoting-style’.
1265
1266 +++
1267 ** show-help-function's arg is converted via substitute-command-keys
1268 before being passed to the function. Help strings, help-echo
1269 properties, etc. can therefore contain command key escapes and
1270 quotation marks.
1271
1272 +++
1273 ** Time-related changes:
1274
1275 *** Time conversion functions now accept an optional ZONE argument
1276 that specifies the time zone rules for conversion. ZONE is omitted or
1277 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1278 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1279 rule. The affected functions are ‘current-time-string’,
1280 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1281 function ‘encode-time’, which already accepted a simple time zone rule
1282 argument, has been extended to accept all the new forms.
1283
1284 *** Time-related functions now consistently accept numbers
1285 (representing seconds since the epoch) and nil (representing the
1286 current time) as well as the usual list-of-integer representation.
1287 Affected functions include `current-time-string', `current-time-zone',
1288 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1289 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1290 `time-to-days', and `time-to-seconds'.
1291
1292 *** The `encode-time-value' and `with-decoded-time-value' macros have
1293 been obsoleted.
1294
1295 *** `calendar-next-time-zone-transition', `time-add', and
1296 `time-subtract' no longer return time values in the obsolete and
1297 undocumented integer-pair format. Instead, they return a list of two
1298 integers.
1299
1300 +++
1301 ** New function `set-binary-mode' allows to switch a standard stream
1302 of the Emacs process to binary I/O mode.
1303
1304 ** ASCII approximations to curved quotes are put in standard-display-table
1305 if the terminal cannot display curved quotes.
1306
1307 ** Standard output and error streams now transliterate characters via
1308 standard-display-table, and encode output using locale-coding-system.
1309
1310 +++
1311 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1312
1313 ** Miscellaneous name change
1314
1315 For consistency with the usual Emacs spelling, the Lisp variable
1316 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1317 The old name should still work, as an obsolescent alias.
1318
1319 \f
1320 * Changes in Frames and Windows Code in Emacs 25.1
1321
1322 +++
1323 ** Emacs can now draw horizontal scroll bars on some platforms that
1324 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1325 Horizontal scroll bars are turned off by default.
1326 *** New function `horizontal-scroll-bars-available-p' telling whether
1327 horizontal scroll bars are available on the underlying system.
1328 *** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1329 bars on all existing and future frames.
1330 *** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1331 scroll bars on the selected frame.
1332 *** New frame parameters `horizontal-scroll-bars' and
1333 `scroll-bar-height' to set horizontal scroll bars and their height
1334 for individual frames and in `default-frame-alist'.
1335 *** New functions `frame-scroll-bar-height' and
1336 `window-scroll-bar-height' return the height of horizontal scroll
1337 bars on a specific frame or window.
1338 *** `set-window-scroll-bars' now accepts five parameters where the last
1339 two specify height and type of the window's horizontal scroll bar.
1340 *** `window-scroll-bars' now returns type and sizes of horizontal scroll
1341 bars too.
1342 *** New buffer-local variables `horizontal-scroll-bar' and
1343 `scroll-bar-height'.
1344
1345 +++
1346 ** New functions `frame-geometry' and `frame-edges' give access to a
1347 frame's geometry.
1348
1349 +++
1350 ** New functions `mouse-absolute-pixel-position' and
1351 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1352 mouse cursor.
1353
1354 +++
1355 ** The function `window-edges' now accepts three additional arguments to
1356 retrieve body, absolute and pixel edges of the window.
1357
1358 +++
1359 ** The functions `window-inside-edges', `window-inside-pixel-edges' and
1360 `window-inside-absolute-pixel-edges' have been renamed to respectively
1361 `window-body-edges', `window-body-pixel-edges' and
1362 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1363
1364 +++
1365 ** New function `window-absolute-pixel-position' to get the screen
1366 coordinates of a visible buffer position.
1367
1368 +++
1369 ** The height of a frame's menu and tool bar are no longer counted in the
1370 frame's text height. This means that the text height stands only for
1371 the height of the frame's root window plus that of the echo area (if
1372 present). This was already the behavior for frames with external tool
1373 and menu bars (like in the Gtk builds) but has now been extended to all
1374 builds.
1375
1376 +++
1377 ** Frames now do not necessarily preserve the number of columns or lines
1378 they display when setting default font, menu bar, fringe width, or
1379 scroll bars. In particular, maximized and fullscreen frames are
1380 conceptually never resized if such settings change. For fullheight and
1381 fullwidth frames, the behavior may depend on the toolkit used.
1382 *** New option `frame-inhibit-implied-resize' if non-nil, means that
1383 setting default font, menu bar, fringe width, or scroll bars of a
1384 specific frame does not resize that frame in order to preserve the
1385 number of columns or lines it displays.
1386
1387 +++
1388 ** New function `window-preserve-size' allows to preserve the size of
1389 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1390 `temp-buffer-resize-mode' and `display-buffer'.
1391
1392 +++
1393 ** New minor mode `window-divider-mode' and options
1394 `window-divider-default-places', `window-divider-default-bottom-width'
1395 and `window-divider-default-right-width'.
1396
1397 +++
1398 ** New option `switch-to-buffer-in-dedicated-window' allows to customize
1399 how `switch-to-buffer' proceeds interactively when the selected window
1400 is strongly dedicated to its buffer.
1401
1402 +++
1403 ** The option `even-window-heights' has been renamed to
1404 `even-window-sizes' and now handles window widths as well.
1405
1406 ** Tearoff menus and detachable toolbars for Gtk+ has been removed.
1407 Those features have been deprecated in Gtk+ for a long time.
1408
1409 ** Miscellaneous
1410
1411 *** etags no longer qualifies class members by default.
1412 By default, `etags' will not qualify class members for C-like
1413 object-oriented languages with their class names and namespaces, and
1414 will remove qualifications used explicitly in the code from the tag
1415 names it puts in TAGS files. This is so the etags.el back-end for
1416 `xref-find-definitions' is more accurate and produces less false
1417 positives.
1418
1419 Use --class-qualify (-Q) if you want the old default behavior of
1420 qualifying class members in C++, Java, and Objective C. Note that
1421 using -Q might make some class members become "unknown" to `M-.'
1422 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1423 qualified names by hand.
1424
1425 \f
1426 * Changes in Emacs 25.1 on Non-Free Operating Systems
1427
1428 ---
1429 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1430 This includes the makefile.w32-in files in various subdirectories, and
1431 the support files. The file nt/configure.bat now just tells the user
1432 to use the procedure described in nt/INSTALL, by running the Posix
1433 `configure' script in the top-level directory.
1434
1435 ---
1436 ** Building Emacs for MS-Windows requires at least Windows XP
1437 or Windows Server 2003. The built binaries still run on all versions
1438 of Windows starting with Windows 9X.
1439
1440 +++
1441 ** Emacs running on MS-Windows now supports the daemon mode.
1442
1443 ** The byte counts in etags-generated TAGS files are now the same on
1444 MS-Windows as they are on other platforms.
1445
1446 ---
1447 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1448 Pass '--without-ns' to configure to create an X11 build, the old default.
1449
1450 ** OS X 10.5 or older is no longer supported.
1451
1452 ** OS X on PowerPC is no longer supported.
1453
1454 ---
1455 ** New variable `ns-use-fullscreen-animation' controls animation for
1456 non-native NS fullscreen. The default is nil. Set to t to enable
1457 animation when entering and leaving fullscreen. For native OSX fullscreen
1458 this has no effect.
1459
1460 ---
1461 ** The new function 'w32-application-type' returns the type of an
1462 MS-Windows application given the name of its executable program file.
1463
1464 \f
1465 ----------------------------------------------------------------------
1466 This file is part of GNU Emacs.
1467
1468 GNU Emacs is free software: you can redistribute it and/or modify
1469 it under the terms of the GNU General Public License as published by
1470 the Free Software Foundation, either version 3 of the License, or
1471 (at your option) any later version.
1472
1473 GNU Emacs is distributed in the hope that it will be useful,
1474 but WITHOUT ANY WARRANTY; without even the implied warranty of
1475 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1476 GNU General Public License for more details.
1477
1478 You should have received a copy of the GNU General Public License
1479 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1480
1481 \f
1482 Local variables:
1483 coding: utf-8
1484 mode: outline
1485 paragraph-separate: "[ \f]*$"
1486 end: