NEWS 30.9 KB
Newer Older
1
GNU Emacs NEWS -- history of user-visible changes.
2

Paul Eggert's avatar
Paul Eggert committed
3
Copyright (C) 2017-2018 Free Software Foundation, Inc.
4
See the end of the file for license conditions.
Dave Love's avatar
#  
Dave Love committed
5

6
Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 8
If possible, use M-x report-emacs-bug.

9
This file is about changes in Emacs version 27.
10

Paul Eggert's avatar
Paul Eggert committed
11
See file HISTORY for a list of GNU Emacs versions and release dates.
12 13
See files NEWS.26, NEWS.25, ..., NEWS.18, and NEWS.1-17 for changes
in older Emacs versions.
14

Paul Eggert's avatar
Paul Eggert committed
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 19 20 21 22
Temporary note:
+++ indicates that all necessary documentation updates are complete.
    (This means all relevant manuals in doc/ AND lisp doc-strings.)
--- means no change in the manuals is needed.
When you add a new item, use the appropriate mark if you are sure it applies,
Eli Zaretskii's avatar
Eli Zaretskii committed
23

Michael Albinus's avatar
Michael Albinus committed
24

25
* Installation Changes in Emacs 27.1
Paul Eggert's avatar
Paul Eggert committed
26

27 28 29 30 31 32 33
** The new configure option '--with-json' adds support for JSON using
the Jansson library.  It is on by default; use 'configure
--with-json=no' to build without Jansson support.  The new JSON
functions 'json-serialize', 'json-insert', 'json-parse-string', and
'json-parse-buffer' are typically much faster than their Lisp
counterparts from json.el.

34 35 36 37 38 39 40
** Emacs has been ported to the -fcheck-pointer-bounds option of GCC.
This causes Emacs to check bounds of some arrays addressed by its
internal pointers, which can be helpful when debugging the Emacs
interpreter or modules that it uses.  If your platform supports it you
can enable it when configuring, e.g., './configure CFLAGS="-g3 -O2
-mmpx -fcheck-pointer-bounds"' on Intel MPX platforms.

41 42 43
** Emacs now normally uses a C pointer type instead of a C integer
type to implement Lisp_Object, which is the fundamental machine word
type internal to the Emacs Lisp interpreter.  This change aims to
44 45 46 47 48
catch typos and support -fcheck-pointer-bounds.  The 'configure'
option --enable-check-lisp-object-type is therefore no longer as
useful and so is no longer enabled by default in developer builds,
to reduce differences between developer and production builds.

49

50
* Startup Changes in Emacs 27.1
51

52 53 54 55 56 57 58 59 60
+++
** Emacs can now be configured using an early init file.
The file is called 'early-init.el', in 'user-emacs-directory'.  It is
loaded very early in the startup process: before graphical elements
such as the tool bar are initialized, and before the package manager
is initialized.  The primary purpose is to allow customizing how the
package system is initialized given that initialization now happens
before loading the regular init file (see below).

61 62 63 64 65 66 67
We recommend against putting any customizations in this file that
don't need to be set up before initializing installed add-on packages,
because the early init file is read too early into the startup
process, and some important parts of the Emacs session, such as
window-system and other GUI features, are not yet set up, which could
make some customization fail to work.

68
+++
69
** Installed packages are now activated *before* loading the init file.
70 71 72 73
This is part of a change intended to eliminate the behavior of
package.el inserting a call to 'package-initialize' into the init
file, which was previously done when Emacs was started.  As a result
of this change, it is no longer necessary to call 'package-initialize'
74 75 76 77 78 79 80
in your init file.

However, if your init file changes the values of 'package-load-list' or
'package-user-dir', or sets 'package-enable-at-startup' to nil then it won't
work right without some adjustment:
- you can move that code to the early init file (see above), so those settings
  apply before Emacs tries to activate the packages.
81
- you can use the new 'package-quickstart' so activation of packages does not
82
  need to pay attention to 'package-load-list' or 'package-user-dir' any more.
83

84

85
* Changes in Emacs 27.1
86

87 88 89 90 91 92
---
** New variable 'xft-ignore-color-fonts'.
Default t means don't try to load color fonts when using Xft, as they
often cause crashes.  Set it to nil if you really need those fonts.
(Bug#30874)

93 94 95 96 97 98
---
** The new option 'tooltip-resize-echo-area' avoids truncating tooltip text
on GUI frames when tooltips are displayed in the echo area.  Instead,
it resizes the echo area as needed to accommodate the full tool-tip
text.

99 100 101 102 103 104
---
** Show modeline tooltips only if the corresponding action applies.
Customize the option 'mode-line-default-help-echo' to restore the old
behavior where the tooltip text is also shown when the corresponding
action does not apply.

105 106 107 108 109 110 111 112 113
+++
** New hook 'server-after-make-frame-hook'.
This hook is a convenient place to perform initializations in daemon
mode which require GUI features to be available.  One example is
restoration of the previous session using the desktop.el package: put
the call to 'desktop-read' in this hook, if you want the GUI settings
to be restored, or if desktop.el needs to interact with you during
restoration of the session.

Mark Oteiza's avatar
Mark Oteiza committed
114 115 116
+++
** New function 'logcount' calculates an integer's Hamming weight.

117 118 119 120 121 122 123 124
+++
** New function 'libxml-available-p'.
This function returns non-nil if libxml support is both compiled in
and available at run time.  Lisp programs should use this function to
detect built-in libxml support, instead of testing for that
indirectly, e.g., by checking that functions like
'libxml-parse-html-region' return nil.

125
+++
126
** 'libxml-parse-xml-region' and 'libxml-parse-html' region take
127 128
a parameter that's called DISCARD-COMMENTS, but it really only
discards the top-level comment.  Therefore this parameter is now
129
obsolete, and the new utility function 'xml-remove-comments' can be
130 131 132
used to remove comments before calling the libxml functions to parse
the data.

133 134 135 136 137
+++
** New function 'fill-polish-nobreak-p', to be used in 'fill-nobreak-predicate'.
It blocks line breaking after a one-letter word, also in the case when
this word is preceded by a non-space, but non-alphanumeric character.

138 139 140 141 142 143 144
+++
** The limit on repetitions in regexps has been raised to 2^16-1.
It was previously limited to 2^15-1.  For example, the following
regular expression was previously invalid, but is now accepted:

   x\{32768\}

145 146 147
---
** The German prefix and postfix input methods now support Capital sharp S.

148

149
* Editing Changes in Emacs 27.1
150

151 152 153 154 155
---
** New variable 'x-wait-for-event-timeout'.
This controls how long Emacs will wait for updates to the graphical
state to take effect (making a frame visible, for example).

156
+++
157 158 159 160
** New user option 'electric-quote-replace-double'.
This option controls whether '"' is replaced in 'electric-quote-mode',
in addition to other quote characters.  If non-nil, ASCII double-quote
characters that quote text "like this" are replaced by double
161 162
typographic quotes, “like this”, in text modes, and in comments in
non-text modes.
163

164 165 166 167 168
---
** 'write-abbrev-file' now includes special properties.
'write-abbrev-file' now writes special properties like ':case-fixed'
for abbrevs that have them.

169
+++
170 171
** The new functions and commands 'text-property-search-forward' and
'text-property-search-backward' have been added.  These provide an
172 173
interface that's more like functions like @code{search-forward}.

Juri Linkov's avatar
Juri Linkov committed
174 175
---
** More commands support noncontiguous rectangular regions, namely
Michael Albinus's avatar
Michael Albinus committed
176
'upcase-dwim', 'downcase-dwim', 'replace-string', 'replace-regexp'.
Juri Linkov's avatar
Juri Linkov committed
177

178 179 180 181 182 183 184
+++
** When asked to visit a large file, Emacs now offers visiting it literally.
Previously, Emacs would only ask for confirmation before visiting
large files.  Now it also offers a third alternative: to visit the
file literally, as in 'find-file-literally', which speeds up
navigation and editing of large files.

Michael Albinus's avatar
Michael Albinus committed
185

186
* Changes in Specialized Modes and Packages in Emacs 27.1
187

188
** Browse-url
189

190 191 192 193
*** The function 'browse-url-emacs' can now visit a URL in selected window.
It now treats the optional 2nd argument to mean that the URL should be
shown in the currently selected window.

194
** Comint
195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211

+++
*** 'C-c .' (comint-insert-previous-argument) no longer interprets '&'.
This feature caused problems when '&&' was present in the previous
command.  Since this command emulates 'M-.' in Bash and zsh, neither
of which treats '&' specially, the feature was removed for
compatibility with these shells.

+++
*** 'comint-insert-previous-argument' can now count arguments from the end.
By default, invoking 'C-c .' with a numeric argument N would copy the
Nth argument, counting from the first one.  But if the new option
'comint-insert-previous-argument-from-end' is non-nil, it will copy
the Nth argument counting from the last one.  Thus 'C-c .' can now
better emulate 'M-.' in both Bash and zsh, since the former counts
from the beginning of the arguments, while the latter counts from the
end.
212

213 214 215 216 217 218 219
** Flymake

+++
*** The variable 'flymake-diagnostic-types-alist' is obsolete
You should instead set properties on known diagnostic symbols, like
':error' and ':warning', as demonstrated in the Flymake manual.

220 221 222
*** New customizable variable 'flymake-start-on-save-buffer'
Control whether Flymake starts checking the buffer on save.

223 224 225 226
*** Flymake and backend functions may exchange hints about buffer changes
This enables more efficient backends.  See the docstring of
'flymake-diagnostic-functions' or the Flymake manual for details.

227 228 229 230 231 232 233 234 235 236 237
** Package
*** New 'package-quickstart' feature
When 'package-quickstart' is non-nil, package.el precomputes a big autoloads
file so that activation of packages can be done much faster, which can speed up
your startup significantly.
It also causes variables like package-user-dir and package-load-list to be
consulted when 'package-quickstart-refresh' is run rather than at startup so
you don't need to set them in your early init file.

*** New function 'package-activate-all'.

238 239
** Ecomplete
*** The ecomplete sorting has changed to a decay-based algorithm.
240
This can be controlled by the new 'ecomplete-sort-predicate' variable.
241 242 243 244

*** The 'ecompleterc' file is now placed in ~/.emacs.d/ecompleterc by default
Of course it will still find it if you have it in ~/.ecompleterc

Paul Eggert's avatar
Paul Eggert committed
245
** Gnus
246 247 248 249 250

+++
*** A prefix argument to 'gnus-summary-limit-to-score' will limit reverse
Limit to articles with score at below.

Paul Eggert's avatar
Paul Eggert committed
251 252 253
*** The function 'gnus-score-find-favorite-words' has been renamed
from 'gnus-score-find-favourite-words'.

254 255 256 257
---
*** Gmane has been removed as an nnir backend, since Gmane no longer
has a search engine.

258
+++
259
*** Splitting mail on common mailing list headers has been added.  See
260
the concept index in the Gnus manual for the 'match-list' entry.
261

262
+++
263
*** nil is no longer an allowed value for 'mm-text-html-renderer'.
264

265
+++
266 267
*** A new Gnus summary mode command, 'S A'
('gnus-summary-attach-article') can be used to attach the current
268 269 270
article(s) to a pre-existing Message buffer, or create a new Message
buffer with the article(s) attached.

271 272 273
** erc

---
274
*** 'erc-button-google-url' has been renamed 'erc-button-search-url'
275 276
and its value has been changed to Duck Duck Go.

277 278 279
** eww/shr

*** When opening external links in eww/shr (typically with the
280 281
'C-u RET' keystroke on a link), the link will be flashed with the new
'shr-selected-link' face to give the user feedback that the command
282 283
has been executed.

Paul Eggert's avatar
Paul Eggert committed
284 285 286 287 288 289
** Htmlfontify
*** The functions 'hfy-color', 'hfy-color-vals' and
'hfy-fallback-color-values' and the variables 'hfy-fallback-color-map'
and 'hfy-rgb-txt-color-map' have been renamed from names that used
'colour' instead of 'color'.

290 291 292 293 294 295 296 297
+++
** Enriched mode supports the 'charset' text property.
You can add or modify the 'charset' text properties of text using the
Edit->Text Properties->Special Properties menu, or by invoking the
'facemenu-set-charset' command.  Documents in Enriched mode will be
saved with the charset properties, and those properties will be
restored when the file is visited.

298 299 300 301
** Smtpmail
Authentication mechanisms can be added via external packages, by
defining new cl-defmethod of smtpmail-try-auth-method.

302 303 304 305 306
** Footnote-mode
*** Support Hebrew-style footnotes
*** Footnote text lines are now aligned.
Can be controlled via the new variable 'footnote-align-to-fn-text'.

307 308 309 310 311 312 313
** CSS mode

---
*** A new command 'css-cycle-color-format' for cycling between color
formats (e.g. "black" => "#000000" => "rgb(0, 0, 0)") has been added,
bound to 'C-c C-f'.

314 315 316
---
*** CSS mode, SCSS mode, and Less CSS mode now have support for Imenu.

317 318 319 320 321 322 323
** SGML mode

---
*** 'sgml-quote' now handles double quotes and apostrophes
when escaping text and in addition all numeric entities when
unescaping text.

324 325 326 327 328 329 330
** Dired

+++
*** The new user option 'dired-create-destination-dirs' controls whether
'dired-do-copy' and 'dired-rename-file' should create non-existent
directories in the destination.

331 332
** Help

333 334 335 336 337 338 339
---
*** Output format of 'C-h l' (view-lossage) has changed.
For convenience, 'view-lossage' now displays the last keystrokes
and commands in the same format as the edit buffer of
'edit-last-kbd-macro'.  This makes it possible to copy the lines from
the buffer generated by 'view-lossage' to the "*Edit Macro*" buffer
created by 'edit-last-kbd-macro', and to save the macro by 'C-c C-c'.
340

341 342 343 344
---
*** The list of help commands produced by 'C-h C-h' ('help-for-help')
can now be searched via 'C-s'.

345 346 347 348 349
** Ibuffer

---
*** New filter ibuffer-filter-by-process; bound to '/E'.

350 351
** Search and Replace

Juri Linkov's avatar
Juri Linkov committed
352 353
+++
*** New isearch bindings.
354

Juri Linkov's avatar
Juri Linkov committed
355
'C-M-w' in isearch changed from isearch-del-char to the new function
356 357
isearch-yank-symbol-or-char.  isearch-del-char is now bound to
'C-M-d'.
Juri Linkov's avatar
Juri Linkov committed
358

359
+++
360 361 362 363 364 365
*** 'search-exit-option' provides new options 'move' and 'shift-move'
to extend the search string by yanking text that ends at the new
position after moving point in the current buffer.  'shift-move'
extends the search string by motion commands while holding down
the shift key.

Juri Linkov's avatar
Juri Linkov committed
366 367 368 369
---
*** Isearch now remembers the regexp-based search mode for words/symbols
and case-sensitivity together with search strings in the search ring.

370 371 372 373
** Edebug

+++
*** The runtime behavior of Edebug's instrumentation can be changed
374 375
using the new variables 'edebug-behavior-alist',
'edebug-after-instrumentation-function' and
376
'edebug-new-definition-function'.  Edebug's behavior can be changed
377 378
globally or for individual definitions.

379 380
** Enhanced xterm support

Mark Oteiza's avatar
Mark Oteiza committed
381 382 383
*** New variable 'xterm-set-window-title' controls whether Emacs sets
the XTerm window title.  This feature is experimental and is disabled
by default.
384

385 386
** Gamegrid

387 388
** grep

389
+++
390 391
*** rgrep, lgrep and zrgrep now hide part of the command line
that contains a list of ignored directories and files.
392 393 394 395
Clicking on the button with ellipsis unhides it.
The abbreviation can be disabled by the new option
'grep-find-abbreviate'.  The new command
'grep-find-toggle-abbreviation' toggles it interactively.
396

Paul Pogonyshev's avatar
Paul Pogonyshev committed
397 398 399 400 401 402
** ERT

+++
*** New variable 'ert-quiet' allows to make ERT output in batch mode
less verbose by removing non-essential information.

403 404
---
*** Gamegrid now determines its default glyph size based on display
405
dimensions, instead of always using 16 pixels.  As a result, Tetris,
406 407
Snake and Pong are more playable on HiDPI displays.

408 409 410 411 412 413
** Filecache

---
*** Completing filenames in the minibuffer via 'C-TAB' now uses the
styles as configured by the variable 'completion-styles'.

414 415 416 417
** New macros 'thunk-let' and 'thunk-let*'.
These macros are analogue to 'let' and 'let*', but create bindings that
are evaluated lazily.

418 419
** next-error

420
+++
421
*** New customizable variable 'next-error-find-buffer-function'.
422 423 424 425 426 427 428 429 430
The value should be a function that determines how to find the
next buffer to be used by 'next-error' and 'previous-error'.  The
default is to use the last buffer that navigated to the current
error.

+++
*** New command 'next-error-select-buffer'.
It can be used to set any buffer as the next one to be used by
'next-error' and 'previous-error'.
431 432 433

** nxml-mode

Eli Zaretskii's avatar
Eli Zaretskii committed
434 435
---
*** The default value of 'nxml-sexp-element-flag' is now t.
436 437 438 439
This means that pressing C-M-SPACE now selects the entire tree by
default, and not just the opening element.


440 441 442 443 444 445 446 447 448
** Eshell

---
*** Expansion of history event designators is disabled by default.
To restore the old behavior, use

    (add-hook 'eshell-expand-input-functions
              #'eshell-expand-history-references)

Glenn Morris's avatar
Glenn Morris committed
449 450
---
*** The function 'eshell-uniquify-list' has been renamed from
Paul Eggert's avatar
Paul Eggert committed
451 452
'eshell-uniqify-list'.

453 454 455 456
*** The function eshell/kill is now able to handle signal switches.
Previously eshell/kill would fail if provided a kill signal to send to the
process.  It now accepts signals specified either by name or by its number.

Paul Eggert's avatar
Paul Eggert committed
457 458 459 460
** Pcomplete
*** The function 'pcomplete-uniquify-list' has been renamed from
'pcomplete-uniqify-list'.

Michael Albinus's avatar
Michael Albinus committed
461 462 463 464 465 466

** Auth-source

---
*** The Secret Service backend supports the :create key now.

467 468 469 470 471 472
** Tramp

+++
*** New connection method "owncloud", which allows to access OwnCloud
or NextCloud hosted files and directories.

473 474 475 476
+++
*** Connection methods "obex" and "synce" are removed, because they
are obsoleted in GVFS.

Michael Albinus's avatar
Michael Albinus committed
477 478 479
+++
*** Validated passwords are saved by auth-source backends which support this.

Michael Albinus's avatar
Michael Albinus committed
480 481 482 483
+++
*** The user option 'tramp-ignored-file-name-regexp' allows to disable
Tramp for some look-alike remote file names.

484 485 486 487
---
** The options.el library has been removed.
It was obsolete since Emacs 22.1, replaced by customize.

488 489 490 491
** The tls.el and starttls.el libraries are now marked obsolete.
Use of built-in libgnutls based functionality (described in the Emacs
GnuTLS manual) is recommended instead.

492

493 494 495 496 497
** Message

+++
*** Messages can now be systematically encrypted
when the PGP keyring contains a public key for every recipient.  To
498
achieve this, add 'message-sign-encrypt-if-all-keys-available' to
499 500
'message-send-hook'.

501 502 503 504 505
---
*** When replying a message that have addresses on the form
'"foo@bar.com" <foo@bar.com>', Message will elide the repeated "name"
from the address field in the response.

506
---
507
*** The default of 'message-forward-as-mime' has changed from t to nil
508 509 510
as it has been reported that many recipients can't read forwards that
are formatted as MIME digests.

511
+++
Michael Albinus's avatar
Michael Albinus committed
512
*** 'message-forward-included-headers' has changed its default to
513 514
exclude most headers when forwarding.

515 516 517 518
** EasyPG

---
*** 'epa-pinentry-mode' is renamed to 'epg-pinentry-mode'.
519 520
It now applies to epg functions as well as epa functions.

521 522 523 524 525 526
---
*** The alias functions 'epa--encode-coding-string',
'epa--decode-coding-string', and 'epa--select-safe-coding-system' have
been removed.  Use 'encode-coding-string', 'decode-coding-string', and
'select-safe-coding-system' instead.

527 528 529 530 531 532 533
** Rmail

+++
*** New user option 'rmail-output-reset-deleted-flag'.
If this option is non-nil, messages appended to an output file by the
'rmail-output' command have their Deleted flag reset.

534 535 536 537
*** The command 'rmail-summary-by-senders' with an empty argument
selects the messages to summarize with a regexp that matches the
sender of the current message.

538
* New Modes and Packages in Emacs 27.1
539

540
+++
541 542 543
** Emacs can now visit files in archives as if they were directories.
This feature uses Tramp and works only on systems which support GVFS,
i.e. GNU/Linux, roughly spoken.  See the chapter "(tramp) Archive file
544 545
names" in the Tramp manual for full documentation of these facilities.

Glenn Morris's avatar
Glenn Morris committed
546 547 548

* Incompatible Lisp Changes in Emacs 27.1

549 550 551 552 553 554 555 556 557 558 559 560 561 562 563
---
** Just loading a theme's file no longer activates the theme's settings.
Loading a theme with 'M-x load-theme' still activates the theme, as it
did before.  However, loading the theme's file with "M-x load-file",
or using 'require' or 'load' in a Lisp program, doesn't actually apply
the theme's settings until you either invoke 'M-x enable-theme' or
type 'M-x load-theme'.  (In a Lisp program, calling 'enable-theme' or
invoking 'load-theme' with NO-ENABLE argument omitted or nil has the
same effect of activating a theme whose file has been loaded.)  The
special case of the 'user' theme is an exception: it is frequently
used for ad-hoc customizations, so the settings of that theme are by
default applied immediately.

The variable 'custom--inhibit-theme-enable' controls this behavior;
its default value changed in Emacs 27.1.
564

565
** The 'repetitions' argument of 'benchmark-run' can now also be a variable.
Glenn Morris's avatar
Glenn Morris committed
566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587
** The FILENAME argument to 'file-name-base' is now mandatory and no
longer defaults to 'buffer-file-name'.

---
** The function 'eldoc-message' now accepts a single argument.
Programs that called it with multiple arguments before should pass
them through 'format' first.  Even that is discouraged: for ElDoc
support, you should set 'eldoc-documentation-function' instead of
calling 'eldoc-message' directly.

** Old-style backquotes now generate an error.  They have been
generating warnings for a decade.  To interpret old-style backquotes
as new-style, bind the new variable 'force-new-style-backquotes' to t.

** Defining a Common Lisp structure using 'cl-defstruct' or
'cl-struct-define' whose name clashes with a builtin type (e.g.,
'integer' or 'hash-table') now signals an error.

** When formatting a floating-point number as an octal or hexadecimal
integer, Emacs now signals an error if the number is too large for the
implementation to format (Bug#30408).

588 589 590 591
+++
** The Lisp reader now signals an overflow for plain decimal integers
that do not end in '.' and are outside Emacs range.  Formerly the Lisp
reader silently converted them to floating-point numbers, and signaled
592 593 594 595
overflow only for integers with a radix that are outside machine range.
To get the old behavior, set the new, experimental variable
read-integer-overflow-as-float to t and please email
30408@debbugs.gnu.org if you need that.  (Bug#30408).
596

597
---
Glenn Morris's avatar
Glenn Morris committed
598
** Some functions and variables obsolete since Emacs 22 have been removed:
599 600 601 602 603 604
archive-mouse-extract, assoc-ignore-case, assoc-ignore-representation,
backward-text-line, blink-cursor, bookmark-exit-hooks,
comint-use-prompt-regexp-instead-of-fields, compilation-finish-function,
count-text-lines, cperl-vc-header-alist, custom-face-save-command,
cvs-display-full-path, cvs-fileinfo->full-path, delete-frame-hook,
derived-mode-class, describe-char-after, describe-project,
Michael Albinus's avatar
Michael Albinus committed
605 606 607 608 609 610
desktop-basefilename, desktop-buffer-handlers, desktop-buffer-misc-functions,
desktop-buffer-modes-to-save, desktop-enable, desktop-load-default,
dired-omit-files-p, disabled-command-hook, dungeon-mode-map,
electric-nroff-mode, electric-nroff-newline, electric-perl-terminator,
focus-frame, forward-text-line, generic-define-mswindows-modes,
generic-define-unix-modes, generic-font-lock-defaults, goto-address-at-mouse,
611 612 613 614
highlight-changes-colours, ibuffer-elide-long-columns, ibuffer-hooks,
ibuffer-mode-hooks, icalendar-convert-diary-to-ical,
icalendar-extract-ical-from-buffer, imenu-always-use-completion-buffer-p,
ipconfig-program, ipconfig-program-options, isearch-lazy-highlight-cleanup,
Michael Albinus's avatar
Michael Albinus committed
615 616 617 618 619 620 621
isearch-lazy-highlight-initial-delay, isearch-lazy-highlight-interval,
isearch-lazy-highlight-max-at-a-time, iswitchb-use-fonts,
latin1-char-displayable-p, mouse-wheel-click-button, mouse-wheel-down-button,
mouse-wheel-up-button, new-frame, pascal-outline, process-kill-without-query,
recentf-menu-append-commands-p, rmail-pop-password,
rmail-pop-password-required, savehist-load, set-default-font,
spam-list-of-processors, speedbar-add-ignored-path-regexp,
622 623 624
speedbar-buffers-line-path, speedbar-ignored-path-expressions,
speedbar-ignored-path-regexp, speedbar-line-path, speedbar-path-line,
timer-set-time-with-usecs, tooltip-gud-display, tooltip-gud-modes,
625
tooltip-gud-toggle-dereference, unfocus-frame, unload-hook-features-list,
626 627 628
update-autoloads-from-directories, vc-comment-ring, vc-comment-ring-index,
vc-comment-search-forward, vc-comment-search-reverse, vc-comment-to-change-log,
vc-diff-switches-list, vc-next-comment, vc-previous-comment, view-todo,
Michael Albinus's avatar
Michael Albinus committed
629 630 631 632 633 634 635
x-lost-selection-hooks, x-sent-selection-hooks.

---
** Further functions and variables obsolete since Emacs 24 have been removed:
default-directory-alist, dired-default-directory,
dired-default-directory-alist, dired-enable-local-variables,
dired-hack-local-variables, dired-local-variables-file, dired-omit-here-always.
636

637
** The function 'display-buffer-in-major-side-window' no longer exists.
638
It has been renamed as internal function 'window--make-major-side-window',
639
however applications should instead call 'display-buffer-in-side-window'
640
(passing the SIDE and SLOT parameters as elements of ALIST).  This approach
641 642 643
is backwards-compatible with versions of Emacs in which the old function
exists.  See the node "Displaying Buffers in Side Windows" in the ELisp
manual for more details.
644

645
* Lisp Changes in Emacs 27.1
Philipp Stephani's avatar
Philipp Stephani committed
646

647
+++
Eli Zaretskii's avatar
Eli Zaretskii committed
648 649 650
** New macro 'dolist-with-progress-reporter'.
This works like 'dolist', but reports progress similar to
'dotimes-with-progress-reporter'.
651

652
+++
653 654 655
** New hook 'after-delete-frame-functions'.
This works like 'delete-frame-functions', but runs after the frame to
be deleted has been made dead and removed from the frame list.
656

657
+++
658 659 660 661
** New frame focus state inspection interface.
The hooks 'focus-in-hook' and 'focus-out-hook' are now obsolete.
Instead, attach to 'after-focus-change-function' using 'add-function'
and inspect the focus state of each frame using 'frame-focus-state'.
662

663
+++
664 665 666
** Emacs now requests and recognizes focus-change notifications from TTYs.
On terminal emulators that support the feature, Emacs can now support
'focus-in-hook' and 'focus-out-hook' for TTY frames.
667

668
+++
669 670 671
** Window-specific face remapping.
Face specifications (of the kind used in 'face-remapping-alist')
now support filters, allowing faces to vary between different windows
672 673
displaying the same buffer.  See the Info node "Face Remapping" of the
Emacs Lisp Reference manual for more detail.
674

675 676 677
+++
** New function assoc-delete-all.

678 679
+++
** New function 'string-distance' to calculate the Levenshtein distance
Chen Bin's avatar
Chen Bin committed
680 681
between two strings.

682 683 684
** 'print-quoted' now defaults to t, so if you want to see
(quote x) instead of 'x you will have to bind it to nil where applicable.

685 686 687 688 689 690 691 692
** To avoid confusion caused by "smart quotes", the reader signals an
error when reading Lisp symbols which begin with one of the following
quotation characters: ‘’‛“”‟〞"'.  A symbol beginning with such a
character can be written by escaping the quotation character with a
backslash.  For example:

    (read "smart") => (invalid-read-syntax "strange quote" "")
    (read "\\smart") == (intern "smart")
693 694 695 696 697

+++
** Omitting variables after '&optional' and '&rest' is now allowed.
For example (defun foo (&optional)) is no longer an error.  This is
sometimes convenient when writing macros.  See the ChangeLog entry
698
titled "Allow '&rest' or '&optional' without following variable
699 700
(Bug#29165)" for a full listing of which arglists are accepted across
versions.
701

Michael Albinus's avatar
Michael Albinus committed
702 703 704
** Internal parsing commands now use 'syntax-ppss' and disregard
'open-paren-in-column-0-is-defun-start'.  This affects mostly things like
'forward-comment', 'scan-sexps', and 'forward-sexp' when parsing backward.
705 706 707
The new variable 'comment-use-syntax-ppss' can be set to nil to recover the old
behavior if needed.

708
** The 'server-name' and 'server-socket-dir' variables are set when a
Michael Albinus's avatar
Michael Albinus committed
709
socket has been passed to Emacs (Bug#24218).
710

711
---
712
** The 'file-system-info' function is now available on all platforms.
713
instead of just Microsoft platforms.  This fixes a 'get-free-disk-space'
714 715
bug on OS X 10.8 and later (Bug#28639).

Paul Eggert's avatar
Paul Eggert committed
716 717 718
+++
** 'memory-limit' now returns a better estimate of memory consumption.

719
+++
Michael Albinus's avatar
Michael Albinus committed
720
** New macro 'combine-change-calls' arranges to call the change hooks
721 722 723 724 725
('before-change-functions' and 'after-change-functions') just once
each around a sequence of lisp forms, given a region.  This is
useful when a function makes a possibly large number of repetitive
changes and the change hooks are time consuming.

726 727 728 729
---
** The function 'get-free-disk-space' returns now a non-nil value for
remote systems, which support this check.

730 731 732 733 734
+++
** The function 'make-string' accepts an additional optional argument.
If the optional third argument is non-nil, 'make-string' will produce
a multibyte string even if its second argument is an ASCII character.

735 736 737
** (format "%d" X) no longer mishandles a floating-point number X that
does not fit in a machine integer (Bug#30408).

738 739 740 741
** New JSON parsing and serialization functions 'json-serialize',
'json-insert', 'json-parse-string', and 'json-parse-buffer'.  These
are implemented in C using the Jansson library.

742 743
** Mailcap

744
---
745
*** The new function 'mailcap-file-name-to-mime-type' has been added.
746 747 748
It's a simple convenience function for looking up MIME types based on
file name extensions.

749 750 751 752 753 754 755
*** The default way the list of possible external viewers for MIME
types is sorted and chosen has changed.  Earlier, the most specific
viewer was chosen, even if there was a general override in ~/.mailcap.
For instance, if /etc/mailcap has an entry for image/gif, that one
will be chosen even if you have an entry for image/* in your
~/.mailcap file.  But with the new method, entries from ~/.mailcap
overrides all system and Emacs-provided defaults.  To get the old
756
method back, set 'mailcap-prefer-mailcap-viewers' to nil.
757 758 759 760 761 762 763 764


** URL

*** The file: handler no longer looks for index.html in directories if
you ask it for a file:///dir URL.  Since this is a low-level library,
such decisions (if they are to be made at all) are left to
higher-level functions.
765 766


767 768 769
** image-mode

*** image-mode started using ImageMagick by default for all images
770
some years back.  It now respects 'imagemagick-types-inhibit' as a way
771 772 773
to disable that.


774
+++
775 776 777
** The new function 'read-answer' accepts either long or short answers
depending on the new customizable variable 'read-answer-short'.

778 779 780 781
** The function 'load' now behaves correctly when loading modules.
Specifically, it puts the module name into 'load-history', prints
loading messages if requested, and protects against recursive loads.

782 783 784 785 786
+++
** The function 'read-variable' now uses its own history list.
The history of variable names read by 'read-variable' is recorded in
the new variable 'custom-variable-history'.

787 788 789 790 791 792 793
---
** The function 'string-to-unibyte' is no longer declared obsolete.
We have found that there are legitimate use cases for this function,
where there's no better alternative.  We believe that the incorrect
uses of this function all but disappeared by now, so we are
un-obsoleting it.

794

795
* Changes in Emacs 27.1 on Non-Free Operating Systems
796

797 798 799 800
---
** Battery status is now supported in all Cygwin builds.
Previously it was supported only in the Cygwin-w32 build.

801 802 803
** Emacs now handles key combinations involving the macOS "command"
and "option" modifier keys more correctly.

804 805 806
** The special handling of 'frame-title-format' on NS where setting it
to 't' would enable the macOS proxy icon has been replaced with a
separate variable, 'ns-use-proxy-icon'.  'frame-title-format' will now
807 808
work as on other platforms.

809 810 811 812 813 814 815
---
** New primitive 'w32-read-registry'.
This primitive lets Lisp programs access the MS-Windows Registry by
retrieving values stored under a given key.  It is intended to be used
for supporting features such as XDG-like location of important files
and directories.

816

Dave Love's avatar
#  
Dave Love committed
817
----------------------------------------------------------------------
818
This file is part of GNU Emacs.
Dave Love's avatar
#  
Dave Love committed
819

820
GNU Emacs is free software: you can redistribute it and/or modify
821
it under the terms of the GNU General Public License as published by
822 823
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
824 825 826 827 828

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
Dave Love's avatar
#  
Dave Love committed
829

830
You should have received a copy of the GNU General Public License
831
along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
Dave Love's avatar
#  
Dave Love committed
832

833

Dave Love's avatar
#  
Dave Love committed
834
Local variables:
835
coding: utf-8
Dave Love's avatar
#  
Dave Love committed
836 837 838
mode: outline
paragraph-separate: "[ 	]*$"
end: