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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 ** Emacs can now load shared/dynamic libraries (modules).
185 A dynamic Emacs module is a shared library that provides additional
186 functionality for use in Emacs Lisp programs, just like a package
187 written in Emacs Lisp would. The functions `load', `require',
188 `load-file', etc. were extended to load such modules, as they do with
189 Emacs Lisp packages. The new variable `module-file-suffix' holds the
190 system-dependent value of the file-name extension (`.so' on Posix
191 hosts) of the module files.
192
193 A module should export a C-callable function named
194 `emacs_module_init', which Emacs will call as part of the call to
195 `load' or `require' which loads the module. It should also export a
196 symbol named `plugin_is_GPL_compatible' to indicate that its code is
197 released under the GPL or compatible license; Emacs will refuse to
198 load modules that don't export such a symbol.
199
200 If a module needs to call Emacs functions, it should do so through the
201 API defined and documented in the header file `emacs-module.h'. Note
202 that any module that provides Lisp-callable functions will have to use
203 Emacs functions such as `fset' and `funcall', in order to register its
204 functions with the Emacs Lisp interpreter.
205
206 Modules can create `user-ptr' Lisp objects that embed pointers to C
207 struct's defined by the module. This is useful for keeping around
208 complex data structures created by a module, to be passed back to the
209 module's functions. User-ptr objects can also have associated
210 "finalizers" -- functions to be run when the object is GC'ed; this is
211 useful for freeing any resources allocated for the underlying data
212 structure, such as memory, open file descriptors, etc. A new
213 predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
214 object.
215
216 Loadable modules in Emacs are an experimental feature, and subject to
217 change in future releases. For that reason, their support is disabled
218 by default, and must be enabled by using the `--with-modules' option
219 at configure time.
220
221 ---
222 ** New input method: `tamil-dvorak'.
223
224 \f
225 * Editing Changes in Emacs 25.1
226
227 +++
228 ** M-x suggests shorthands and ignores obsolete commands for completion.
229
230 ** Changes in undo
231
232 +++
233 *** Successive single-char deletions are collapsed in the undo-log just like
234 successive char insertions. Which commands invoke this behavior is
235 controlled by the new `undo-auto-amalgamate' function. See the node
236 "Undo" in the ELisp manual for more details.
237
238 +++
239 *** The heuristic used to insert `undo-boundary' after each command
240 has changed, so that if a command causes changes in more than just the
241 current buffer, Emacs now calls `undo-boundary' in every buffer
242 affected by the command.
243
244 +++
245 ** New command `comment-line' bound to `C-x C-;'.
246
247 ** New and improved facilities for inserting Unicode characters
248
249 ---
250 *** Unicode names entered via C-x 8 RET now use substring completion by default.
251
252 +++
253 *** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
254 € № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
255
256 +++
257 *** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
258 as you type. See also the new variable ‘text-quoting-style’.
259
260 ---
261 ** New minor mode global-eldoc-mode is enabled by default.
262
263 ---
264 ** Emacs now supports "bracketed paste mode" when running on a terminal
265 that supports it. This facility allows Emacs to understand pasted
266 chunks of text as strings to be inserted, instead of interpreting each
267 character in the pasted text as actual user input. This results in a
268 paste experience similar to that under a window system, and significant
269 performance improvements when pasting large amounts of text.
270
271 +++
272 ** Emacs now supports the latest version of the UBA.
273 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
274 was updated to support all the latest additions and changes introduced
275 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
276 This includes full support for directional isolates and the
277 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
278 standards.
279
280 +++
281 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
282
283 +++
284 ** New buffer-local `electric-pair-local-mode'.
285
286 +++
287 ** New variable `fast-but-imprecise-scrolling' inhibits
288 fontification during full screen scrolling operations, giving less
289 hesitant operation during auto-repeat of C-v, M-v at the cost of
290 possible inaccuracies in the end position.
291
292 \f
293 * Changes in Specialized Modes and Packages in Emacs 25.1
294
295 ** Checkdoc
296
297 +++
298 *** New command `checkdoc-package-keywords' checks if the
299 current package keywords are recognized. Set the new option
300 `checkdoc-package-keywords-flag' to non-nil to make
301 `checkdoc-current-buffer' call this function automatically.
302
303 +++
304 *** New function `checkdoc-file' checks for style errors.
305 It's meant for use together with `compile':
306 emacs -batch --eval "(checkdoc-file \"subr.el\")"
307
308 +++
309 ** New function `bookmark-set-no-overwrite' bound to C-x r M.
310 It raises an error if a bookmark of that name already exists,
311 unlike `bookmark-set' which silently updates an existing bookmark.
312
313 ** JSON
314
315 ---
316 *** `json-pretty-print' and `json-pretty-print-buffer' now maintain
317 the ordering of object keys by default.
318
319 ---
320 *** New commands `json-pretty-print-ordered' and
321 `json-pretty-print-buffer-ordered' pretty prints JSON objects with
322 object keys sorted alphabetically.
323
324 +++
325 ** Prog mode has some support for multi-mode indentation.
326 This allows better indentation support in modes that support multiple
327 programming languages in the same buffer, like literate programming
328 environments or ANTLR programs with embedded Python code.
329
330 A major mode can provide indentation context for a sub-mode through
331 the `prog-indentation-context' variable. To support this, modes that
332 provide indentation should use `prog-widen' instead of `widen' and
333 `prog-first-column' instead of a literal zero. See the node
334 "Mode-Specific Indent" in the ELisp manual for more details.
335
336 ** Prettify Symbols mode
337
338 +++
339 *** Prettify Symbols mode supports custom composition predicates. By
340 overriding the default `prettify-symbols-compose-predicate', modes can
341 specify in which contexts a symbol may be displayed as some Unicode
342 character. `prettify-symbols-default-compose-p' is the default which
343 is suitable for most programming languages such as C or Lisp (but not
344 (La)TeX).
345
346 +++
347 *** Symbols can be unprettified while point is inside them.
348 New variable `prettify-symbols-unprettify-at-point' configures this.
349
350 ** New `xterm-screen-extra-capabilities' config.
351
352 ** The `save-place' variable is replaced by a `save-place-mode'.
353
354 ** ERC
355
356 *** Hide message types by network or channel. `erc-hide-list' will
357 hide all messages of the specified type, where `erc-network-hide-list'
358 and `erc-channel-hide-list' will only hide the specified message types
359 for the respective specified targets.
360
361 ** Midnight-mode
362
363 *** `midnight-mode' is a proper minor mode.
364
365 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
366
367 ** In xterms, killing text now also sets the CLIPBOARD/PRIMARY selection
368 in the surrounding GUI (using the OSC-52 escape sequence). This only works
369 if your xterm supports it and enables the `allowWindowOps' options (disabled
370 by default at least in Debian, for security reasons).
371
372 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
373 escape sequence) if your xterm has the feature enabled but for that you
374 additionally need to add `getSelection' to `xterm-extra-capabilities'.
375
376 ** xterm-mouse-mode now supports mouse-tracking (if your xterm supports it).
377
378 ** package.el
379
380 *** New "external" package status.
381 An external package is any installed package that's not built-in and
382 not from `package-user-dir', which usually means it's from an entry in
383 `package-directory-list'. They are treated much like built-in
384 packages, in that they cannot be deleted through the package menu and
385 are not considered for upgrades.
386
387 The effect, is that a user can manually place a specific version of a
388 package inside `package-directory-list' and the package menu will
389 always respect that.
390
391 *** If a package is available on multiple archives and one has higher
392 priority (as per `package-archive-priorities') only that one is
393 listed. This can be configured with `package-menu-hide-low-priority'.
394
395 *** `package-menu-toggle-hiding' now toggles the hiding of packages.
396 This includes the above-mentioned low-priority packages, as well as
397 available packages whose version is lower than the currently installed
398 version (which were previously impossible to display).
399 This allows users to downgrade a package if a lower version is
400 available.
401
402 *** When filtering the package menu, keywords starting with "arc:" or
403 "status:" represent package archive or status, respectively, instead
404 of actual keywords.
405
406 *** Most functions which involve downloading information now take an
407 ASYNC argument. If it is non-nil, package.el performs the download(s)
408 asynchronously.
409
410 *** New variable `package-menu-async' controls whether the
411 package-menu uses asynchronous downloads.
412
413 *** `package-install-from-buffer' and `package-install-file' work on directories.
414 This follows the same rules as installing from a .tar file, except the
415 -pkg file is optional.
416
417 *** Packages which are dependencies of other packages cannot be deleted.
418 The FORCE argument to `package-delete' overrides this.
419
420 *** New custom variable `package-selected-packages' tracks packages
421 which were installed by the user (as opposed to installed as
422 dependencies). This variable can also be manually customized.
423
424 *** New command `package-install-user-selected-packages' installs all
425 packages from `package-selected-packages' which are currently missing.
426
427 *** New command `package-autoremove' removes all packages which were
428 installed strictly as dependencies but are no longer needed.
429
430 ** Shell
431
432 When you invoke `shell' interactively, the *shell* buffer will now
433 display in a new window. However, you can customize this behavior via
434 the `display-buffer-alist' variable. For example, to get
435 the old behavior -- *shell* buffer displays in current window -- use
436 (add-to-list 'display-buffer-alist
437 '("^\\*shell\\*$" . (display-buffer-same-window))).
438
439 ** EIEIO
440 +++
441 *** The `:protection' slot option is not obeyed any more.
442 +++
443 *** The `newname' argument to constructors is optional&deprecated.
444 If you need your objects to be named, do it by inheriting from `eieio-named'.
445 +++
446 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
447 +++
448 *** The <class> variables are declared obsolete.
449 +++
450 *** The <initarg> variables are declared obsolete.
451 *** defgeneric and defmethod are declared obsolete.
452 +++
453 *** `constructor' is now an obsolete alias for `make-instance'.
454
455 ** ido
456 *** New command `ido-bury-buffer-at-head' bound to C-S-b
457 Bury the buffer at the head of `ido-matches', analogous to how C-k
458 kills the buffer at head.
459 *** A prefix argument to `ido-restrict-to-matches' will reverse its
460 meaning, and the list is restricted to those elements that do not
461 match the current input.
462
463 ** Minibuffer
464
465 *** You can use <up> and <down> keys to move point in the multi-line
466 minibuffer just as in an ordinary buffer. Only when point moves over
467 the bottom/top of the minibuffer it goes to the next/previous history
468 element. The new commands bound to <up> and <down> in the minibuffer:
469 `next-line-or-history-element' and `previous-line-or-history-element'.
470
471 ** Search and Replace
472
473 +++
474 *** New user option `search-default-regexp-mode'
475 specifies the default mode for I-search.
476
477 +++
478 *** `isearch' and `query-replace' can now perform character folding in matches.
479 Isearch does that by default, while `query-replace' will do that if
480 the new variable `replace-character-fold' is customized to a non-nil
481 value. This is analogous to case folding, but instead of disregarding
482 case variants, it disregards wider classes of distinctions between
483 similar characters. (Case folding is a special case of character
484 folding.) This means many characters in the search string will match
485 entire groups of characters instead of just themselves.
486
487 For instance, the " will match all variants of double quotes (like “
488 and ”), and the letter a will match all of its accented cousins, even
489 those composed of multiple characters, as well as many other symbols
490 like ℀, ℁, ⒜, and ⓐ.
491
492 +++
493 *** New function `character-fold-to-regexp' can be used
494 by searching commands to produce a regexp matching anything that
495 character-folds into STRING.
496
497 +++
498 *** The new M-s M-w key binding uses eww to search the web for the
499 text in the region. The search engine to use for this is specified by
500 the customizable variable `eww-search-prefix'.
501
502 +++
503 *** Query-replace history is enhanced.
504 When query-replace reads the FROM string from the minibuffer, typing
505 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
506 and TO are the original text and its replacement, and SEP is an arrow
507 string defined by the new variable `query-replace-from-to-separator'.
508 To select a prior replacement, type `M-p' until the desired
509 replacement appears in the minibuffer, and then exit the minibuffer by
510 typing RET.
511
512 ** Calc
513 +++
514 *** If `quick-calc' is called with a prefix argument, insert the
515 result of the calculation into the current buffer.
516
517 +++
518 ** In Edebug, you can now set the initial mode with C-x C-a C-m. With
519 this you can tell Edebug not to stop at the start of the first
520 instrumented function.
521
522 ** ElDoc
523 *** New minor mode `global-eldoc-mode'
524 *** `eldoc-documentation-function' now defaults to `ignore'
525 *** `describe-char-eldoc' displays information about character at point,
526 and can be used as a default value of `eldoc-documentation-function'. It is
527 useful when, for example, one needs to distinguish various spaces (e.g. ] [,
528 ] [, ] [, etc.) while using mono-spaced font.
529
530 ** eww
531
532 ---
533 *** HTML can now be rendered using variable-width fonts.
534
535 +++
536 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
537 whether to use variable-pitch fonts or not. The user can also
538 customize the `shr-use-fonts' variable.
539
540 +++
541 *** A new command `R' (`eww-readable') will try do identify the main
542 textual parts of a web page and display only that, leaving menus and
543 the like off the page.
544
545 ---
546 *** You can now use several eww buffers in parallel by renaming eww
547 buffers you want to keep separate.
548
549 +++
550 *** Partial state of the eww buffers (the URIs and the titles of the
551 pages visited) is now preserved in the desktop file.
552
553 +++
554 *** `eww-after-render-hook' is now called after eww has rendered
555 the data in the buffer.
556
557 ---
558 *** The `eww-reload' command now takes a prefix to not reload via
559 the net, but just use the local copy of the HTML.
560
561 +++
562 *** The DOM shr and eww uses has been changed to the general Emacs
563 xml.el/libxml2 DOM, and a new package dom.el has been added to
564 interact with this DOM. See the Emacs Lisp manual for interface
565 details.
566
567 +++
568 *** `mailcap-mime-data' is now consulted when displaying PDF files.
569
570 +++
571 *** The new `S' command will list all eww buffers, and allow managing
572 them.
573
574 ---
575 *** https pages with valid certificates have headers marked in green, while
576 invalid certificates are marked in red.
577
578 ** Message mode
579
580 *** text/html messages that contain inline image parts will be
581 transformed into multipart/related messages before sending.
582
583 ** pcase
584 *** New UPatterns `quote', `app', `cl-struct', and `eieio'.
585 *** New UPatterns can be defined with `pcase-defmacro'.
586 +++
587 *** New vector QPattern.
588
589 ** Lisp mode
590 *** Strings after `:documentation' are highlighted as docstrings.
591
592 ** Rectangle editing
593 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
594 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
595 *** `string-rectangle' provides on-the-fly preview of the result.
596
597 ** New font-lock functions font-lock-ensure and font-lock-flush, which
598 should be used instead of font-lock-fontify-buffer when called from Elisp.
599
600 ** Macro `minibuffer-with-setup-hook' takes (:append FUN) to mean
601 appending FUN to `minibuffer-setup-hook'.
602
603 ** cl-lib
604 *** New functions cl-fresh-line, cl-digit-char-p and cl-parse-integer.
605
606 ** Calendar and diary
607
608 +++
609 *** The default `diary-file' is now located in .emacs.d.
610
611 +++
612 *** New commands to insert diary entries with Chinese dates:
613 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
614 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
615
616 +++
617 *** The calendar can now list and mark diary entries with Chinese dates.
618 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
619
620 ---
621 *** The option `calendar-mode-line-format' can now be nil,
622 which means to do nothing special with the mode line in calendars.
623
624 +++
625 *** New option `calendar-weekend-days'.
626 The option customizes which day headers receive the
627 `calendar-weekend-header' face.
628
629 ---
630 *** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.
631
632 ---
633 *** Many items obsolete since at least version 23.1 have been removed.
634 The majority were function/variable/face aliases, too numerous to list here.
635 The remainder were:
636
637 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
638 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
639
640 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
641
642 **** Macro `calendar-for-loop'.
643
644 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
645
646 **** The nil and list forms of `diary-display-function'.
647
648 ** New ERT function `ert-summarize-tests-batch-and-exit'.
649
650 ** New js.el option `js-indent-first-init'.
651
652 ---
653 ** `Info-fontify-maximum-menu-size' can be t for no limit.
654
655 +++
656 ** `info-display-manual' can now be given a prefix argument which (any
657 non-nil value) directs the command to limit the completion
658 alternatives to currently visited manuals.
659
660 ---
661 ** ntlm.el has support for NTLM2.
662
663 ** Rmail
664
665 *** The Rmail commands d, C-d and u take optional repeat counts to delete or
666 undelete multiple messages.
667
668 *** Rmail can now render HTML mail messages if your Emacs was built with
669 libxml2 or if you have the Lynx browser installed. By default, Rmail
670 will display the HTML version of a mail message that has both HTML and
671 plain text parts, if display of HTML email is possible; customize the
672 `rmail-mime-prefer-html' option to `nil' if you don't want that.
673
674 +++
675 *** In the commands that make summaries by subject, recipients, or senders,
676 you can no longer use commas to separate regular expressions.
677
678 ** SES now supports local printer functions; see `ses-define-local-printer'.
679
680 ** sh-script
681 *** In sh-mode you can now use `sh-shell' as a file-local variable to
682 specify the type of shell in use (bash, csh, etc).
683
684 *** New value `always' for sh-indent-after-continuation.
685 This provides old-style ("dumb") indentation of continued lines.
686
687 ** TLS
688 ---
689 *** Fatal TLS errors are now silent by default.
690
691 ** URL
692
693 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
694 When `url-handler-mode' is enabled, file operations for these
695 protocols as well as for "telnet" and "ftp" are passed to Tramp.
696
697 *** The URL package allows customizing the `url-user-agent' string.
698 The new `url-user-agent' variable can be customized to be a string or
699 a function.
700
701 *** The new interface variable `url-request-noninteractive' can be used
702 to specify that we're running in a noninteractive context, and that
703 we should not be queried about things like TLS certificate validity.
704
705 *** If URL is used with a https connection, the first callback argument
706 plist will contain a :peer element that has the output of
707 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
708
709 ** Tramp
710
711 +++
712 *** New connection method "afp", which allows to access Mac OS X
713 volumes via the Apple Filing Protocol.
714
715 +++
716 *** New connection method "nc", which allows to access dumb busyboxes.
717
718 +++
719 *** Method-specific parameters can be overwritten now with variable
720 `tramp-connection-properties'.
721
722 ---
723 *** Handler for `file-notify-valid-p' for remote machines that support
724 filesystem notifications.
725
726 ** SQL mode
727
728 *** New user variable `sql-default-directory' enables remote
729 connections using Tramp.
730
731 *** New command `sql-send-line-and-next' sends the current line to the
732 interactive buffer and advances to the next line, skipping whitespace
733 and comments.
734
735 *** Add support for Vertica SQL.
736
737 ** VC and related modes
738
739 *** Basic push support, via `vc-push', bound to `C-x v P'.
740 Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
741 (undocumented) command vc-hg-push now behaves slightly differently.
742
743 *** The new command vc-region-history shows the log+diff of the active region.
744
745 +++
746 *** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
747 This command is useful when you perform version control commands
748 outside Emacs (e.g., from the shell prompt), or if you switch the VC
749 back-end for the buffer's file, or remove it from version control.
750
751 *** New option `vc-annotate-background-mode' controls whether
752 the color range from `vc-annotate-color-map' is applied to the
753 background or to the foreground.
754
755 *** `compare-windows' now compares text with the most recently used window
756 instead of the next window. The new option `compare-windows-get-window-function'
757 allows to customize this.
758
759 *** Two new faces `compare-windows-removed' and `compare-windows-added'
760 replace the obsolete face `compare-windows'.
761
762 ---
763 *** `log-edit-insert-changelog' converts "(tiny change)" to
764 "Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
765 nil to disable this.
766
767 ** VHDL mode supports VHDL'08.
768
769 ** Calculator: decimal display mode uses "," groups, so it's more
770 fitting for use in money calculations; factorial works with
771 non-integer inputs.
772
773 ** HideIfDef mode now support full C/C++ expressions, argumented macro expansions,
774 interactive macro evaluation and automatic scanning of #defined symbols.
775
776 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header file
777 name patterns. Default case-insensitive .h, .hh, .hpp, .hxx, and .h++.
778 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
779 reinclusion protected header files from being fully hidden.
780 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
781 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be excluded.
782
783 ** TeX mode
784
785 *** New custom variable `tex-print-file-extension' to help users who
786 use PDF instead of DVI.
787
788 *** TeX mode now supports Prettify Symbols mode. When enabling
789 `prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
790 many other math macros are displayed using unicode characters.
791
792 ** whitespace-mode: new 'big-indent style highlighting too much indentation.
793 By default, 32 spaces and four TABs are considered to be too much but
794 `whitespace-big-indent-regexp' can be configured to change that.
795
796 ** tildify: `tildify-space-string', `tildify-pattern', and
797 `tildify-foreach-region-function' variables added making
798 `tildify-string-alist', `tildify-pattern-alist', and
799 `tildify-ignored-environments-alist' variables (as well as a few
800 helper functions) obsolete.
801
802 ** xref
803 The new package provides generic framework and new commands to find
804 and move to definitions, as well as pop back to the original location.
805
806 *** New key bindings
807 `xref-find-definitions' replaces `find-tag' and provides an interface
808 to pick one destination among several. Hence, `tags-loop-continue' is
809 unbound. `xref-pop-marker-stack' replaces `pop-tag-mark', but uses an
810 easier binding, which is now unoccupied (`M-,').
811 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
812 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
813 `xref-find-apropos' replaces `find-tag-regexp'.
814
815 *** New variables
816 `find-tag-marker-ring-length' is now an obsolete alias for
817 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
818 alias for a private variable. `xref-push-marker-stack' and
819 `xref-pop-marker-stack' should be used to mutate it instead.
820
821 ** etags
822 As a result of the above, these commands are now obsolete:
823 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
824 `tags-apropos' and `tags-loop-continue'.
825
826 ** EUDC
827 EUDC's LDAP backend has been improved.
828
829 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
830
831 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
832 subprocess instead of on the command line.
833
834 *** EUDC handles LDAP wildcards automatically so the user shouldn't
835 need to configure this manually anymore.
836
837 *** The LDAP configuration section of EUDC's manual has been
838 rewritten.
839
840 There have also been customization changes.
841
842 *** New custom variable `eudc-server-hotlist' to allow specifying
843 multiple EUDC servers in init file.
844
845 *** Custom variable `eudc-inline-query-format' defaults to completing
846 on email and firstname instead of surname.
847
848 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
849 to avoid interfering with the kill ring.
850
851 *** Custom variable `eudc-inline-expansion-format' defaults to
852 "Firstname Surname <mail-address>".
853
854 *** Custom variable `eudc-options-file' defaults to
855 "~/.emacs.d/eudc-options".
856
857 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
858 allow overriding the regular expression that recognizes the ldapsearch
859 command line's password prompt.
860
861 EUDC's BBDB backend now supports BBDB 3.
862
863 EUDC's PH backend (eudcb-ph.el) is obsolete.
864
865 ** Eshell
866
867 +++
868 *** The new built-in command `clear' can scroll window contents out of sight.
869 If provided with an optional non-nil argument, the scrollback contents will be cleared.
870
871 *** New buffer syntax '#<buffer-name>', which is equivalent to
872 '#<buffer buffer-name>'. This shorthand makes interacting with
873 buffers from eshell more convenient. Custom variable
874 `eshell-buffer-shorthand', which has been broken for a while, has been
875 removed.
876
877 *** By default, eshell "visual" program buffers (created by
878 `eshell-visual-commands' and similar custom vars) are no longer killed
879 when their processes die. This fixes issues with short-lived commands
880 and makes visual programs more useful in general. For example, if
881 "git log" is a visual command, it will always show the visual command
882 buffer, even if the "git log" process dies. For the old behavior,
883 make the new option `eshell-destroy-buffer-when-process-dies' non-nil.
884
885 ** Browse-url
886
887 *** Support for the Conkeror web browser.
888
889 ---
890 *** Support for several ancient browsers is now officially obsolete.
891
892 +++
893 ** tar-mode: new `tar-new-entry' command, allowing for new members to
894 be added to the archive.
895
896 ---
897 ** Autorevert: dired buffers are also auto-reverted via file
898 notifications, if Emacs is compiled with file notification support.
899
900 ** File Notifications
901
902 +++
903 *** The new event `stopped' signals, that a file notification watch is
904 not active any longer.
905
906 +++
907 *** The new function `file-notify-valid-p' checks, whether a file
908 notification descriptor still corresponds to an activate watch.
909
910 ** Dired
911
912 +++
913 *** The command `dired-do-compress' bound to `Z' now can compress
914 directories and decompress zip files.
915
916 +++
917 *** New command `dired-do-compress-to' bound to `c' can be used to
918 compress many marked files into a single named archive. The
919 compression command is determined from the new
920 `dired-compress-files-alist' variable.
921
922 ** Tabulated List Mode
923
924 +++
925 *** It is now safe for a mode that derives `tabulated-list-mode' to not
926 call `tabulated-list-init-header', in which case it will have no
927 header.
928
929 +++
930 *** `tabulated-list-print' takes a second optional argument, update,
931 which specifies an alternative printing method which is faster when
932 few or no entries have changed.
933
934 ** Obsolete packages
935
936 ---
937 *** gulp.el
938
939 *** landmark.el (moved to elpa.gnu.org)
940
941 \f
942 * New Modes and Packages in Emacs 25.1
943
944 ** pinentry.el allows GnuPG passphrase to be prompted through the
945 minibuffer instead of a graphical dialog, depending on whether the gpg
946 command is called from Emacs (i.e., INSIDE_EMACS environment variable
947 is set). This feature requires newer versions of GnuPG (2.1.5 or
948 later) and Pinentry (0.9.5 or later).
949
950 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
951
952 ** scss-mode (a minor variant of css-mode)
953
954 ** let-alist is a new macro (and a package) that allows one to easily
955 let-bind the values stored in an alist.
956
957 ** `tildify-mode' allows to automatically insert hard spaces as one
958 types the text. Breaking line after a single-character words is
959 forbidden by Czech and Polish typography (and may be discouraged in
960 other languages), so `auto-tildify-mode' makes it easier to create
961 a typographically-correct documents.
962
963 ** The `seq' library adds sequence manipulation functions and macros
964 that complement basic functions provided by subr.el. All functions
965 are prefixed with `seq-' and work on lists, strings and vectors.
966
967 ** The `map' library provides map-manipulation functions that work on
968 alists, hash-table and arrays. All functions are prefixed with
969 `map-'.
970
971 ** The `thunk' library provides functions and macros to control the
972 evaluation of forms.
973
974 ** js-jsx-mode (a minor variant of js-mode) provides indentation
975 support for JSX, an XML-like syntax extension to ECMAScript.
976
977 \f
978 * Incompatible Lisp Changes in Emacs 25.1
979
980 ---
981 ** `setq' and `setf' must now be called with an even number of
982 arguments. The earlier behavior of silently supplying a nil to the
983 last variable when there was an odd number of arguments has been
984 eliminated.
985
986 ** `syntax-begin-function' is declared obsolete.
987 Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
988 slot in font-lock-defaults.
989
990 +++
991 ** `package-initialize' now sets `package-enable-at-startup' to nil if
992 called during startup. Users who call this function in their init
993 file and still expect it to be run after startup should set
994 `package-enable-at-startup' to t after the call to
995 `package-initialize'.
996
997 ** `:global' minor mode use `setq-default' rather than `setq'.
998 This means that you can't use `make-local-variable' and expect them to
999 "magically" become buffer-local.
1000
1001 ** `inhibit-point-motion-hooks' now defaults to t and is obsolete.
1002
1003 +++
1004 ** `track-mouse' no longer freezes the shape of the mouse pointer.
1005 The `track-mouse' form no longer refrains from changing the shape of
1006 the mouse pointer for the entire time the body of that form is
1007 executed. Lisp programs that use `track-mouse' for dragging across
1008 large portions of the Emacs display, and want to avoid changes in the
1009 pointer shape during dragging, should bind the variable `track-mouse'
1010 to the special value `dragging' in the body of the form.
1011
1012 ---
1013 ** The optional `predicate' argument of `lisp-complete-symbol' no longer
1014 has any effect. (This change was made in Emacs 24.4 but was not
1015 advertised at the time.)
1016
1017 ** `indirect-function' does not signal `void-function' any more.
1018 This is mostly a bug-fix, since this change was missed back in 24.4 when
1019 symbol-function was changed not to signal `void-function' any more.
1020
1021 *** As a consequence, the second arg of `indirect-function' is now obsolete.
1022
1023 ** Comint, term, and compile do not set the EMACS env var any more.
1024 Use the INSIDE_EMACS environment variable instead.
1025
1026 ** `save-excursion' does not save&restore the mark any more.
1027
1028 ** read-buffer-function can now be called with a 4th argument (`predicate').
1029
1030 ** completion-table-dynamic stays in the minibuffer.
1031 If you want the old behavior of calling the function in the buffer
1032 from which the minibuffer was entered, call it with the new argument
1033 `switch-buffer'.
1034
1035 ** window-configurations no longer record the buffers' marks.
1036
1037 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
1038 active region handling.
1039
1040 ** deactivate-mark is now buffer-local.
1041
1042 ** `cl-the' now asserts that its argument is of the given type.
1043
1044 ** `process-running-child-p` may now return a numeric process
1045 group ID instead of `t'.
1046
1047 +++
1048 ** Mouse click events on mode line or header line no longer include
1049 any reference to a buffer position. The 6th member of the mouse
1050 position list returned for such events is now nil.
1051
1052 ** Menu items in keymaps do not support the "key shortcut cache" any more.
1053 These slots used to hold key-shortcut data, but have been obsolete since
1054 Emacs-21.
1055
1056 ** Emacs no longer downcases the first letter of a system diagnostic
1057 when signaling a file error. For example, it now reports "Permission
1058 denied" instead of "permission denied". The old behavior was problematic
1059 in languages like German where downcasing rules depend on grammar.
1060
1061 +++
1062 ** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
1063 Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
1064 for straight apostrophes 'like this', and to ‘grave’ for grave accent
1065 and apostrophe `like this'. The default value nil acts like ‘curve’
1066 if curved single quotes are displayable, and like ‘grave’ otherwise.
1067 The new variable affects display of diagnostics and help, but not of info.
1068
1069 +++
1070 ** substitute-command-keys now replaces quotes.
1071 That is, it converts documentation strings’ quoting style as per the
1072 value of ‘text-quoting-style’. Doc strings in source code can use
1073 either curved single quotes or grave accents and apostrophes. As
1074 before, characters preceded by \= are output as-is.
1075
1076 +++
1077 ** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
1078 They use the new ‘format-message’ function instead of plain ‘format’,
1079 so that they now follow user preference as per ‘text-quoting-style’
1080 when processing curved single quotes, grave accents, and apostrophes
1081 in their format argument.
1082
1083 +++
1084 ** The character classes [:alpha:] and [:alnum:] in regular expressions
1085 now match multibyte characters using Unicode character properties.
1086 If you want the old behavior where they matched any character with
1087 word syntax, use `\sw' instead.
1088
1089 +++
1090 ** The character classes [:graph:] and [:print:] in regular expressions
1091 no longer match every multibyte character. Instead, Emacs now
1092 consults the Unicode character properties to determine which
1093 characters are graphic or printable. In particular, surrogates and
1094 unassigned codepoints are now rejected. If you want the old behavior,
1095 use [:multibyte:] instead.
1096
1097 +++
1098 ** The `diff' command uses the unified format now. To restore the old
1099 behavior, set `diff-switches' to `-c'.
1100
1101 ** `grep-template' and `grep-find-template' values don't include the
1102 --color argument anymore. It's added at the <C> place holder position
1103 dynamically. Any third-party code that changes these templates should
1104 be updated accordingly.
1105
1106 +++
1107 ** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
1108 The new behavior is compatible with Common Lisp and with XEmacs.
1109 This change does not affect Lisp code intended to be portable to
1110 Emacs 24.2 and earlier, which did not support unary ‘/’.
1111
1112 +++
1113 ** The `default-directory' value doesn't have to end slash. To make
1114 that happen, `unhandled-file-name-directory' now defaults to calling
1115 `file-name-as-directory'.
1116
1117 \f
1118 * Lisp Changes in Emacs 25.1
1119
1120 ** syntax-propertize is now automatically called on-demand during forward
1121 parsing functions like `forward-sexp'.
1122
1123 ** New hooks prefix-command-echo-keystrokes-functions and
1124 prefix-command-preserve-state-hook, to allow the definition of prefix
1125 commands other than the predefined C-u.
1126
1127 ** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
1128
1129 ** The default value of `load-read-function' is now `read'.
1130
1131 ** New hook `pre-redisplay-functions', a bit easier to use than pre-redisplay-function.
1132
1133 ** The second arg of `looking-back' should always be provided explicitly.
1134
1135 ** Obsolete text properties `intangible', `point-entered', and `point-left'.
1136 Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
1137 implemented by the new `cursor-intangible-mode' and
1138 `cursor-sensor-mode' minor modes.
1139
1140 ** New process type `pipe', which can be used in combination with the
1141 `:stderr' keyword of make-process to handle standard error output
1142 of subprocess.
1143
1144 ** New function `make-process' provides an alternative interface to
1145 `start-process'. It allows programs to set process parameters such as
1146 process filter, sentinel, etc., through keyword arguments (similar to
1147 `make-network-process').
1148
1149 +++
1150 ** A new function `directory-files-recursively' returns all matching
1151 files (recursively) under a directory.
1152
1153 +++
1154 ** New variable `inhibit-message', when bound to non-nil, inhibits
1155 `message' and related functions from displaying messages the Echo
1156 Area. The output is still logged to the *Messages* buffer.
1157
1158 +++
1159 ** A new text property `inhibit-read-only' can be used in read-only
1160 buffers to allow certain parts of the text to be writable.
1161
1162 ** `read-buffer' takes a new `predicate' argument.
1163
1164 ** Emacs Lisp now supports generators.
1165
1166 ** New finalizer facility for running code when objects
1167 become unreachable.
1168
1169 ** lexical closures can use (:documentation <form>) to build their docstring.
1170 It should be placed right where the docstring would be, and <form> is then
1171 evaluated (and should return a string) when the closure is built.
1172
1173 ** define-inline provides a new way to define inlinable functions.
1174
1175 ** New function `macroexpand-1' to perform a single step of macroexpansion.
1176
1177 ** Some "x-*" were obsoleted:
1178 *** x-select-text is renamed gui-select-text.
1179 *** x-selection-value is renamed gui-selection-value.
1180 *** x-get-selection is renamed gui-get-selection.
1181 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
1182 *** x-get-selection-value is renamed to gui-get-primary-selection.
1183 *** x-set-selection is renamed to gui-set-selection
1184
1185 ** New function `string-greaterp', which return the opposite result of
1186 `string-lessp'.
1187
1188 +++
1189 ** The new functions `string-collate-lessp' and `string-collate-equalp'
1190 preserve the collation order as defined by the system's locale(1)
1191 environment. For the time being this is implemented for modern POSIX
1192 systems and for MS-Windows, for other systems they fall back to their
1193 counterparts `string-lessp' and `string-equal'.
1194
1195 ---
1196 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
1197 If you want the old, locale-independent sorting, customize the new
1198 option `ls-lisp-use-string-collate' to a nil value.
1199
1200 +++
1201 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
1202 if set to a non-nil value, causes the above 2 functions to ignore
1203 symbol and punctuation characters when collating strings. This
1204 emulates the behavior of modern Posix platforms when the locale's
1205 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
1206 MS-Windows doesn't support UTF-8 as codeset in its locales.
1207
1208 ** New function `alist-get', which is also a valid place (aka lvalue).
1209
1210 ** New function `funcall-interactively', which works like `funcall'
1211 but makes `called-interactively-p' treat the function as (you guessed it)
1212 called interactively.
1213
1214 ** New function `function-put' to use instead of `put' for function properties.
1215
1216 +++
1217 ** The new function `bidi-find-overridden-directionality' allows to
1218 find characters whose directionality was, perhaps maliciously,
1219 overridden by directional override control characters. Lisp programs
1220 can use this to detect potential phishing of URLs and other links that
1221 exploits bidirectional display reordering.
1222
1223 +++
1224 ** The new function `buffer-substring-with-bidi-context' allows to
1225 copy a portion of a buffer into a different location while preserving
1226 the visual appearance both of the copied text and the text at
1227 destination, even when the copied text includes mixed bidirectional
1228 text and directional control characters.
1229
1230 +++
1231 ** New properties that can be specified with `declare':
1232 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
1233 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
1234 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
1235 have side effects.
1236
1237 +++
1238 ** New macro `with-file-modes', for evaluating expressions with default file
1239 permissions set to temporary values (e.g., for creating private files).
1240
1241 ** You can access the slots of structures using `cl-struct-slot-value'.
1242
1243 ** Function `sort' can deal with vectors.
1244
1245 ** Function `system-name' now returns an updated value if the current
1246 system's name has changed or if the Emacs process has changed systems,
1247 and to avoid long waits it no longer consults DNS to canonicalize the
1248 name. The variable `system-name' is now obsolete.
1249
1250 +++
1251 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
1252
1253 ** If `pwd' is called with a prefix argument, insert the current default
1254 directory at point.
1255
1256 +++
1257 ** New functions return extended information about fonts and faces.
1258
1259 +++
1260 *** The function `font-info' now returns more details about a font.
1261 In particular, it now returns the average width of the font's
1262 characters, which can be used for geometry-related calculations.
1263
1264 +++
1265 *** A new function `default-font-width' returns the average width of a
1266 character in the current buffer's default font. If the default face
1267 is remapped (see `face-remapping-alist'), the value for the remapped
1268 face is returned. This function complements the existing function
1269 `default-font-height'.
1270
1271 +++
1272 *** New functions `window-font-height' and `window-font-width' return
1273 the height and average width of characters in a specified face and
1274 window. If FACE is remapped (see `face-remapping-alist'), the
1275 function returns the information for the remapped face.
1276
1277 +++
1278 *** A new function `window-max-chars-per-line' returns the maximal
1279 number of characters that can be displayed on one line. If a face
1280 and/or window are provided, these values are used for the
1281 calculation. This function is different from `window-body-width' in
1282 that it accounts for (i) continuation glyphs, (ii) the size of the
1283 font, and (iii) the specified window.
1284
1285 ---
1286 ** New utilities in subr-x.el:
1287 *** New macros `if-let' and `when-let' allow defining bindings and to
1288 execute code depending whether all values are true.
1289 *** New macros `thread-first' and `thread-last' allow threading a form
1290 as the first or last argument of subsequent forms.
1291
1292 +++
1293 ** Documentation strings now support quoting with curved single quotes
1294 ‘like-this’ in addition to the old style with grave accent and
1295 apostrophe `like-this'. The new style looks better on today's displays.
1296 In the new Electric Quote mode, you can enter curved single quotes
1297 into documentation by typing ` and '. Outside Electric Quote mode,
1298 you can enter them by typing ‘C-x 8 [’ and ‘C-x 8 ]’, or (if your Alt
1299 key works) by typing ‘A-[’ and ‘A-]’. As described above under
1300 ‘text-quoting-style’, the user can specify how to display doc string
1301 quotes.
1302
1303 +++
1304 ** New function ‘format-message’ is like ‘format’ and also converts
1305 curved single quotes, grave accents and apostrophes as per
1306 ‘text-quoting-style’.
1307
1308 +++
1309 ** show-help-function's arg is converted via substitute-command-keys
1310 before being passed to the function. Help strings, help-echo
1311 properties, etc. can therefore contain command key escapes and
1312 quotation marks.
1313
1314 +++
1315 ** Time-related changes:
1316
1317 *** Time conversion functions now accept an optional ZONE argument
1318 that specifies the time zone rules for conversion. ZONE is omitted or
1319 nil for Emacs local time, t for Universal Time, ‘wall’ for system wall
1320 clock time, or a string as in ‘set-time-zone-rule’ for a time zone
1321 rule. The affected functions are ‘current-time-string’,
1322 ‘current-time-zone’, ‘decode-time’, and ‘format-time-string’. The
1323 function ‘encode-time’, which already accepted a simple time zone rule
1324 argument, has been extended to accept all the new forms.
1325
1326 *** Time-related functions now consistently accept numbers
1327 (representing seconds since the epoch) and nil (representing the
1328 current time) as well as the usual list-of-integer representation.
1329 Affected functions include `current-time-string', `current-time-zone',
1330 `decode-time', `float-time', `format-time-string', `seconds-to-time',
1331 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
1332 `time-to-days', and `time-to-seconds'.
1333
1334 *** The `encode-time-value' and `with-decoded-time-value' macros have
1335 been obsoleted.
1336
1337 *** `calendar-next-time-zone-transition', `time-add', and
1338 `time-subtract' no longer return time values in the obsolete and
1339 undocumented integer-pair format. Instead, they return a list of two
1340 integers.
1341
1342 +++
1343 ** New function `set-binary-mode' allows to switch a standard stream
1344 of the Emacs process to binary I/O mode.
1345
1346 +++
1347 ** The new function `directory-name-p' can be used to check whether a file
1348 name (as returned from, for instance, `file-name-all-completions') is
1349 a directory file name. It returns non-nil if the last character in
1350 the name is a directory separator character (forward slash on GNU and
1351 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
1352
1353 ** ASCII approximations to curved quotes are put in standard-display-table
1354 if the terminal cannot display curved quotes.
1355
1356 ** Standard output and error streams now transliterate characters via
1357 standard-display-table, and encode output using locale-coding-system.
1358
1359 +++
1360 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
1361
1362 +++
1363 ** New possible value for `system-type': `nacl'.
1364 This is used by Google's Native Client (NaCl).
1365
1366 ** Miscellaneous name change
1367
1368 For consistency with the usual Emacs spelling, the Lisp variable
1369 `hfy-optimisations' has been renamed to `hfy-optimizations'.
1370 The old name should still work, as an obsolescent alias.
1371
1372 \f
1373 * Changes in Frames and Windows Code in Emacs 25.1
1374
1375 +++
1376 ** Emacs can now draw horizontal scroll bars on some platforms that
1377 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
1378 Horizontal scroll bars are turned off by default.
1379 *** New function `horizontal-scroll-bars-available-p' telling whether
1380 horizontal scroll bars are available on the underlying system.
1381 *** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
1382 bars on all existing and future frames.
1383 *** New function `toggle-horizontal-scroll-bar' to toggle horizontal
1384 scroll bars on the selected frame.
1385 *** New frame parameters `horizontal-scroll-bars' and
1386 `scroll-bar-height' to set horizontal scroll bars and their height
1387 for individual frames and in `default-frame-alist'.
1388 *** New functions `frame-scroll-bar-height' and
1389 `window-scroll-bar-height' return the height of horizontal scroll
1390 bars on a specific frame or window.
1391 *** `set-window-scroll-bars' now accepts five parameters where the last
1392 two specify height and type of the window's horizontal scroll bar.
1393 *** `window-scroll-bars' now returns type and sizes of horizontal scroll
1394 bars too.
1395 *** New buffer-local variables `horizontal-scroll-bar' and
1396 `scroll-bar-height'.
1397
1398 +++
1399 ** New functions `frame-geometry' and `frame-edges' give access to a
1400 frame's geometry.
1401
1402 +++
1403 ** New functions `mouse-absolute-pixel-position' and
1404 `set-mouse-absolute-pixel-position' get/set screen coordinates of the
1405 mouse cursor.
1406
1407 +++
1408 ** The function `window-edges' now accepts three additional arguments to
1409 retrieve body, absolute and pixel edges of the window.
1410
1411 +++
1412 ** The functions `window-inside-edges', `window-inside-pixel-edges' and
1413 `window-inside-absolute-pixel-edges' have been renamed to respectively
1414 `window-body-edges', `window-body-pixel-edges' and
1415 `window-absolute-body-pixel-edges'. The old names are kept as aliases.
1416
1417 +++
1418 ** New function `window-absolute-pixel-position' to get the screen
1419 coordinates of a visible buffer position.
1420
1421 +++
1422 ** The height of a frame's menu and tool bar are no longer counted in the
1423 frame's text height. This means that the text height stands only for
1424 the height of the frame's root window plus that of the echo area (if
1425 present). This was already the behavior for frames with external tool
1426 and menu bars (like in the Gtk builds) but has now been extended to all
1427 builds.
1428
1429 +++
1430 ** Frames now do not necessarily preserve the number of columns or lines
1431 they display when setting default font, menu bar, fringe width, or
1432 scroll bars. In particular, maximized and fullscreen frames are
1433 conceptually never resized if such settings change. For fullheight and
1434 fullwidth frames, the behavior may depend on the toolkit used.
1435 *** New option `frame-inhibit-implied-resize' if non-nil, means that
1436 setting default font, menu bar, fringe width, or scroll bars of a
1437 specific frame does not resize that frame in order to preserve the
1438 number of columns or lines it displays.
1439
1440 +++
1441 ** New function `window-preserve-size' allows to preserve the size of
1442 windows without "fixing" it. It's supported by `fit-window-to-buffer',
1443 `temp-buffer-resize-mode' and `display-buffer'.
1444
1445 +++
1446 ** New minor mode `window-divider-mode' and options
1447 `window-divider-default-places', `window-divider-default-bottom-width'
1448 and `window-divider-default-right-width'.
1449
1450 +++
1451 ** New option `switch-to-buffer-in-dedicated-window' allows to customize
1452 how `switch-to-buffer' proceeds interactively when the selected window
1453 is strongly dedicated to its buffer.
1454
1455 +++
1456 ** The option `even-window-heights' has been renamed to
1457 `even-window-sizes' and now handles window widths as well.
1458
1459 ** Tearoff menus and detachable toolbars for Gtk+ has been removed.
1460 Those features have been deprecated in Gtk+ for a long time.
1461
1462 ** Etags
1463
1464 *** etags no longer qualifies class members by default.
1465
1466 By default, `etags' will not qualify class members for C-like
1467 object-oriented languages with their class names and namespaces, and
1468 will remove qualifications used explicitly in the code from the tag
1469 names it puts in TAGS files. This is so the etags.el back-end for
1470 `xref-find-definitions' is more accurate and produces less false
1471 positives.
1472
1473 Use --class-qualify (-Q) if you want the old default behavior of
1474 qualifying class members in C++, Java, and Objective C. Note that
1475 using -Q might make some class members become "unknown" to `M-.'
1476 (`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
1477 qualified names by hand.
1478
1479 *** New language Ruby
1480
1481 Names of modules, classes, methods, and functions are tagged.
1482 Overloaded operators are also tagged.
1483
1484 *** Improved support for Lua
1485
1486 Etags now tags functions even if the "function" keyword follows some
1487 whitespace at line beginning.
1488
1489 \f
1490 * Changes in Emacs 25.1 on Non-Free Operating Systems
1491
1492 ---
1493 ** MS-Windows specific Emacs build scripts are no longer in the distribution
1494 This includes the makefile.w32-in files in various subdirectories, and
1495 the support files. The file nt/configure.bat now just tells the user
1496 to use the procedure described in nt/INSTALL, by running the Posix
1497 `configure' script in the top-level directory.
1498
1499 ---
1500 ** Building Emacs for MS-Windows requires at least Windows XP
1501 or Windows Server 2003. The built binaries still run on all versions
1502 of Windows starting with Windows 9X.
1503
1504 +++
1505 ** Emacs running on MS-Windows now supports the daemon mode.
1506
1507 ** The byte counts in etags-generated TAGS files are now the same on
1508 MS-Windows as they are on other platforms.
1509
1510 ---
1511 ** On OS X, configure creates a Cocoa ("Nextstep") build by default.
1512 Pass '--without-ns' to configure to create an X11 build, the old default.
1513
1514 ** OS X 10.5 or older is no longer supported.
1515
1516 ** OS X on PowerPC is no longer supported.
1517
1518 ---
1519 ** New variable `ns-use-fullscreen-animation' controls animation for
1520 non-native NS fullscreen. The default is nil. Set to t to enable
1521 animation when entering and leaving fullscreen. For native OSX fullscreen
1522 this has no effect.
1523
1524 ---
1525 ** The new function 'w32-application-type' returns the type of an
1526 MS-Windows application given the name of its executable program file.
1527
1528 \f
1529 ----------------------------------------------------------------------
1530 This file is part of GNU Emacs.
1531
1532 GNU Emacs is free software: you can redistribute it and/or modify
1533 it under the terms of the GNU General Public License as published by
1534 the Free Software Foundation, either version 3 of the License, or
1535 (at your option) any later version.
1536
1537 GNU Emacs is distributed in the hope that it will be useful,
1538 but WITHOUT ANY WARRANTY; without even the implied warranty of
1539 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1540 GNU General Public License for more details.
1541
1542 You should have received a copy of the GNU General Public License
1543 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1544
1545 \f
1546 Local variables:
1547 coding: utf-8
1548 mode: outline
1549 paragraph-separate: "[ \f]*$"
1550 end: