NEWS 82.3 KB
Newer Older
1
GNU Emacs NEWS -- history of user-visible changes.
2

Paul Eggert's avatar
Paul Eggert committed
3
Copyright (C) 2017-2019 Free Software Foundation, Inc.
4
See the end of the file for license conditions.
Dave Love's avatar
#  
Dave Love committed
5

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

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
** Emacs now uses GMP, the GNU Multiple Precision library.
By default, if 'configure' does not find a suitable libgmp, it
arranges for the included mini-gmp library to be built and used.
30
The new 'configure' option '--without-libgmp' uses mini-gmp even if a
31
suitable libgmp is available.
Tom Tromey's avatar
Tom Tromey committed
32

33 34
** Emacs can now use HarfBuzz as its shaping engine.
The new configure option '--with-harfbuzz' adds support for the
Paul Eggert's avatar
Paul Eggert committed
35
HarfBuzz text shaping engine.  It is on by default; use './configure
36 37
--without-harfbuzz' to build without it.  The HarfBuzz text shaping is
available via new font backend drivers 'xfthb' and 'ftcrhb' for Xft
38
and Cairo drawings, respectively, and via the 'harfbuzz' backend on
39 40 41 42 43
MS-Windows.  The Harfbuzz text shaping is preferred to the previously
supported ones, so the font backends that use older shaping engines
(FLT on GNU and Unix systems and Uniscribe on MS-Windows) are not
enabled by default; they can be enabled via the 'font-backend' frame
parameter or via X resources.
Paul Eggert's avatar
Paul Eggert committed
44

45
** The new configure option '--with-json' adds support for JSON using
46
the Jansson library.  It is on by default; use './configure
47 48 49 50 51
--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.

52 53 54 55
** Emacs no longer defaults to using ImageMagick to display images,
due to security and stability concerns.  To override the default, use
'configure --with-imagemagick'.

56 57
** Several configure options now accept an option-argument 'ifavailable'.
For example, './configure --with-xpm=ifavailable' now configures Emacs
58 59 60
to attempt to use libxpm but to continue building even if libxpm is
absent.  The other affected options are '--with-gif', '--with-gnutls',
'--with-jpeg', '--with-png', and '--with-tiff'.
61

Paul Eggert's avatar
Paul Eggert committed
62 63 64 65 66 67 68
** The etags program now uses the C library's regular expression matcher
when possible, and a compatible regex substitute otherwise.  This will
let developers maintain Emacs's own regex code without having to also
support other programs.  The new configure option '--without-included-regex'
forces etags to use the C library's regex matcher even if the regex
substitute ordinarily would be used to work around compatibility problems.

69
** Emacs has been ported to the '-fcheck-pointer-bounds' option of GCC.
70 71 72 73 74 75
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.

76 77 78
** 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
79 80
catch typos and supports '-fcheck-pointer-bounds'.  The 'configure'
option '--enable-check-lisp-object-type' is therefore no longer as
81 82 83
useful and so is no longer enabled by default in developer builds,
to reduce differences between developer and production builds.

84 85 86 87 88 89 90 91
+++
** Emacs now uses a "portable dumper" instead of unexec.
This improves compatibility with memory allocation on modern systems,
and in particular better supports the Address Space Layout
Randomization (ASLR) feature, a security technique used by most modern
operating systems.

Portable dumping can be disabled at configure time via the configure
92 93 94
option '--with-dumping=unexec' (but we don't recommend that, unless
the portable dumping doesn't work on your system for some
reason---please report such systems to the Emacs developers as bugs).
95 96 97 98 99 100 101

When built with the portable dumping support (which is the default),
Emacs looks for the 'emacs.pdmp' file, generated during the build, in
its data directory at startup, and loads the dumped state from there.
The new command-line argument '--dump-file=FILE' allows to specify a
non-default '.pdmp' file to load the state from; see the node "Initial
Options" in the Emacs manual for more information.
Daniel Colascione's avatar
Daniel Colascione committed
102

Paul Eggert's avatar
Paul Eggert committed
103 104 105 106 107
+++
** The new configure option '--enable-checking=structs' attempts to
check that the portable dumper code has been updated to match the last
change to one of the data structures that it relies on.

108
+++
109 110 111
** The configure options '--enable-checking=conslist' and
'--enable-checking=xmallocoverrun' have been withdrawn.  The former
made Emacs irredeemably slow, and the latter made it crash.  Neither
112 113 114
option was useful with modern debugging tools such as AddressSanitizer.
(See etc/DEBUG for the details of using the modern replacements of the
removed configure options.)
115

116 117 118 119
+++
** The distribution tarball now has test cases; 'make check' runs them.
This is intended mostly to help developers.

120 121 122 123
---
** Emacs now requires GTK 2.24 and GTK 3.10 for the GTK 2 and GTK 3
builds respectively.

124

125
* Startup Changes in Emacs 27.1
126

127 128 129 130 131 132 133 134 135
+++
** 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).

136 137 138 139
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
140
'window-system' and other GUI features, are not yet set up, which could
141 142
make some customization fail to work.

143
+++
144
** Installed packages are now activated *before* loading the init file.
145 146 147 148
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'
149 150
in your init file.

151 152 153 154 155 156 157 158
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.
- You can use the new 'package-quickstart' so activation of packages
  does not need to pay attention to 'package-load-list' or
  'package-user-dir' any more.
159

160 161 162 163 164
---
** Emacs now notifies systemd when startup finishes or shutdown begins.
Units that are ordered after 'emacs.service' will only be started
after Emacs has finished initialization and is ready for use.
(If your Emacs is installed in a non-standard location and you copied the
165
emacs.service file to eg "~/.config/systemd/user/", you will need to copy
166 167
the new version of the file again.)

168 169 170 171 172 173
+++
** New option 'help-enable-completion-auto-load'.
This allows disabling the new feature introduced in Emacs 26.1 which
loads files during completion of 'C-h f' and 'C-h v' according to
'definition-prefixes'.

174

175
* Changes in Emacs 27.1
176

177 178
** emacsclient

179
+++
180
*** emacsclient now supports the 'EMACS_SOCKET_NAME' environment variable.
Eli Zaretskii's avatar
Eli Zaretskii committed
181 182
The behavior is identical to 'EMACS_SERVER_FILE', in that the
command-line value specified via '--socket-name' will override the
183
environment, and the natural default to 'TMPDIR', then "/tmp", continues
Eli Zaretskii's avatar
Eli Zaretskii committed
184
to apply.
185

186
+++
187
*** Emacs and emacsclient now default to "$XDG_RUNTIME_DIR/emacs"
188
as the directory for client/server sockets, if Emacs is running
189
under an X Window System desktop that sets the 'XDG_RUNTIME_DIR'
190
environment variable to indicate where session sockets should go.
191
To get the old, less-secure behavior, you can set the
192
'EMACS_SOCKET_NAME' environment variable to an appropriate value.
193

194 195 196 197
---
*** When run by root, emacsclient no longer connects to non-root sockets.
(Instead you can use Tramp methods to run root commands in a non-root Emacs.)

198 199 200 201 202 203 204
---
** Control of the threshold for using the 'distant-foreground' color.
The threshold for color distance below which the 'distant-foreground'
color of the face will be used instead of the foreground color can now
be controlled via the new variable 'face-near-same-color-threshold'.
The default value is 30000, as the previously hard-coded threshold.

Tino Calancha's avatar
Tino Calancha committed
205
+++
206
** The function 'read-passwd' uses "*" as default character to hide passwords.
Tino Calancha's avatar
Tino Calancha committed
207

208 209 210
** Lexical binding is now used when evaluating interactive Elisp forms.
More specifically, lexical-binding is now used for 'M-:', '--eval', as
well as in the "*scratch*" and "*ielm*" buffers.
211

212 213 214 215 216 217
---
** 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.

218
---
219
** Show mode line tooltips only if the corresponding action applies.
220 221 222 223
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.

224 225 226 227 228 229 230 231 232
+++
** 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
233 234 235
+++
** New function 'logcount' calculates an integer's Hamming weight.

236 237 238 239 240 241 242 243
+++
** 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.

244
+++
245
** 'libxml-parse-xml-region' and 'libxml-parse-html-region' take
246 247
a parameter that's called DISCARD-COMMENTS, but it really only
discards the top-level comment.  Therefore this parameter is now
248
obsolete, and the new utility function 'xml-remove-comments' can be
249 250 251
used to remove comments before calling the libxml functions to parse
the data.

252 253
+++
** The Network Security Manager now allows more fine-grained control
254
of what checks to run via the 'network-security-protocol-checks'
255 256
variable.

257
+++
258 259 260 261 262 263 264 265 266
** TLS connections have their security tightened by default.
Most of the checks for outdated, believed-to-be-weak TLS algorithms
and ciphers are now switched on by default.  By default, the NSM will
flag connections using these weak algorithms and ask users whether to
allow them.  To get the old behavior back (where certificates are
checked for validity, but no warnings about weak cryptography are
issued), you can either set 'network-security-protocol-checks' to nil,
or adjust the elements in that variable to only happen on the 'high'
security level (assuming you use the 'medium' level).
267

268 269 270
+++
** Native GnuTLS connections can now use client certificates.
Previously, this support was only available when using the external
271
'gnutls-cli' command.  Call 'open-network-stream' with
272 273 274
':client-certificate t' to trigger looking up of per-server
certificates via 'auth-source'.

275 276 277 278 279
+++
** 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.

280 281 282 283 284 285 286
+++
** 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\}

287 288 289
---
** The German prefix and postfix input methods now support Capital sharp S.

290
---
291
** New input methods 'hawaiian-postfix' and 'hawaiian-prefix'.
292

293 294 295 296 297 298 299
---
** New input methods for several variants of the Sami language.
The Sami input methods include: 'norwegian-sami-prefix',
'bergsland-hasselbrink-sami-prefix', 'southern-sami-prefix',
'ume-sami-prefix', 'northern-sami-prefix', 'inari-sami-prefix',
'skolt-sami-prefix', and 'kildin-sami-prefix'.

300 301 302 303 304
+++
** In Japanese environments that do not specify encodings and are not
based on MS-Windows, the default encoding is now utf-8 instead of
japanese-iso-8bit.

305
+++
306 307 308 309
** New function 'exec-path'.
This function by default returns the value of the corresponding
variable, but can optionally return the equivalent of 'exec-path'
from a remote host.
310 311

+++
312 313
** The function 'executable-find' supports an optional argument REMOTE.
This triggers to search the program on the remote host as indicated by
314 315
'default-directory'.

316 317 318 319 320
+++
** New variable 'auto-save-no-message'.
When set to t, no message will be shown when auto-saving (default
value: nil).

321 322 323 324 325 326
---
** The value of 'make-cursor-line-fully-visible' can now be a function.
In addition to nil or non-nil, the value can now be a predicate
function.  Follow mode uses this to control scrolling of its windows
when the last screen line in a window is not fully visible.

327 328 329 330
+++
** New variable 'emacs-repository-branch'.
It reports the git branch from which Emacs was built.

331 332
+++
** New user option 'switch-to-buffer-obey-display-actions'.
333 334 335
When non-nil, 'switch-to-buffer' uses 'pop-to-buffer-same-window' that
respects display actions specified by 'display-buffer-alist' and
'display-buffer-overriding-action'.
336

337 338 339 340 341 342
** New 'flex' completion style
An implementation of popular "flx/fuzzy/scatter" completion which
matches strings where the pattern appears as a subsequence.  Put
simply, makes "foo" complete to both "barfoo" and "frodo".  Add 'flex'
to 'completion-styles' or 'completion-category-overrides' to use it.

343 344 345 346 347 348 349 350
** Connection-local variables

+++
*** Connection-local variables are applied by default like file-local
and directory-local variables.

+++
*** The macro 'with-connection-local-variables' has been renamed from
351
'with-connection-local-profiles'.  No argument PROFILES needed any longer.
352

353
---
354 355
** New variable 'next-error-verbose' controls when 'next-error' outputs
a message about the error locus.
356 357

---
358
** New variable 'grep-search-path' defines the directories searched for
359
grep hits (this used to be controlled by 'compilation-search-path').
360 361

---
362 363 364
** New variable 'emacs-lisp-compilation-search-path' defines the
directories searched for byte-compiler error messages (this used to
be controlled by 'compilation-search-path').
365

366 367 368
** Multicolor fonts such as "Noto Color Emoji" can be displayed on
Emacs configured with Cairo drawing and linked with cairo >= 1.16.0.

369
+++
370 371
** Emacs now optionally displays a fill column indicator.

372
This is similar to what 'fill-column-indicator' package provides, but
373
much faster and compatible with 'show-trailing-whitespace'.
374 375 376 377 378

Customize the buffer-local variables 'display-fill-column-indicator'
and 'display-fill-column-indicator-character' to activate the
indicator.

379
The indicator is not displayed at all in minibuffer windows and
380 381 382
in tooltips, as it is not useful there.

There are 2 new buffer local variables and 1 face to customize this
383
mode they are described in the manual "(emacs) Display".
384

385 386 387 388
+++
** 'progress-reporter-update' accepts a suffix string to display.


389

390
* Editing Changes in Emacs 27.1
391

392 393 394
+++
** New command 'make-empty-file'.

395 396 397 398 399
---
** 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).

400
+++
401 402 403 404
** 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
405 406
typographic quotes, “like this”, in text modes, and in comments in
non-text modes.
407

408 409 410 411 412 413 414
---
** New user option 'flyspell-case-fold-duplications'.
This option controls whether Flyspell mode considers consecutive words
to be duplicates if they are not in the same case.  If non-nil, the
default, words are considered to be duplicates even if their letters'
case does not match.

415 416 417 418 419
---
** 'write-abbrev-file' now includes special properties.
'write-abbrev-file' now writes special properties like ':case-fixed'
for abbrevs that have them.

Allen Li's avatar
Allen Li committed
420
+++
Allen Li's avatar
Allen Li committed
421 422 423
** 'write-abbrev-file' skips empty tables.
'write-abbrev-file' now skips inserting a 'define-abbrev-table' form for
tables which do not have any non-system abbrevs to save.
Allen Li's avatar
Allen Li committed
424

425
+++
426 427
** The new functions and commands 'text-property-search-forward' and
'text-property-search-backward' have been added.  These provide an
428
interface that's more like functions like 'search-forward'.
429

Juri Linkov's avatar
Juri Linkov committed
430 431
---
** More commands support noncontiguous rectangular regions, namely
Michael Albinus's avatar
Michael Albinus committed
432
'upcase-dwim', 'downcase-dwim', 'replace-string', 'replace-regexp'.
Juri Linkov's avatar
Juri Linkov committed
433

434 435 436 437 438 439 440
+++
** 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.

441
---
442 443 444 445
** 'add-dir-local-variable' now uses dotted pair notation syntax to
write alists of variables to ".dir-locals.el".  This is the same
syntax that you can see in the example of a ".dir-locals.el" file in
the node "(emacs) Directory Variables" of the user manual.
446

447
+++
448
** Network connections using 'local' can now use IPv6.
449
'make-network-process' now uses the correct loopback address when
450
asked to use ':host 'local' and ':family 'ipv6'.
451

452
+++
453
** The new function 'replace-region-contents' replaces the current
454
region using a given replacement-function in a non-destructive manner
455
(in terms of 'replace-buffer-contents').
456 457

+++
458
** The command 'replace-buffer-contents' now has two optional
459 460 461
arguments mitigating performance issues when operating on huge
buffers.

462
+++
463 464 465 466
** The command 'delete-indentation' now operates on the active region.
If the region is active, the command joins all the lines in the
region.  When there's no active region, the command works on the
current and the previous or the next line, as before.
467

Michael Albinus's avatar
Michael Albinus committed
468

469
* Changes in Specialized Modes and Packages in Emacs 27.1
470

471 472
** compile.el
---
473 474
*** In 'compilation-error-regexp-alist', 'line' (and 'end-line') can
be functions.
475

476
** cl-lib.el
477
+++
478 479
*** 'cl-defstruct' has a new ':noinline' argument to prevent inlining
its functions.
480

481 482
** doc-view.el
*** New commands 'doc-view-presentation' and 'doc-view-fit-window-to-page'.
483
*** Added support for password-protected PDF files
484

485 486 487 488 489
** Ido
*** New user option 'ido-big-directories' to mark directories whose
names match certain regular expressions as big.  Ido won't attempt to
list the contents of such directories when completing file names.

490 491 492 493 494 495
** Minibuffer

---
*** Minibuffer now uses 'minibuffer-message' to display error messages
at the end of the active minibuffer.

496
** map.el
497 498
*** Now also understands plists.
*** Now defined via generic functions that can be extended via 'cl-defmethod'.
499
*** Deprecate the 'map-put' macro in favor of a new 'map-put!' function.
500
*** 'map-contains-key' now returns a boolean rather than the key.
501
*** Deprecate the 'testfn' args of 'map-elt' and 'map-contains-key'.
502
*** New generic function 'map-insert'.
503

504 505 506 507 508
+++
** seq.el
New convenience functions 'seq-first' and 'seq-rest' give easy access
to respectively the first and all but the first elements of sequences.

509 510 511
The new predicate function 'seq-contains-p' should be used instead of
the now obsolete 'seq-contains'.

512 513 514 515
---
** Follow mode
In the current follow group of windows, "ghost" cursors are no longer
displayed in the non-selected follow windows.  To get the old behavior
516
back, customize 'follow-hide-ghost-cursors' to nil.
517

518 519
** Windmove

520 521 522
*** 'windmove-create-window' when non-nil makes a new window on moving off
the edge of the frame.

523
*** Windmove supports directional window display and selection.
524 525
The new command 'windmove-display-default-keybindings' binds default
keys with provided modifiers (by default, Shift-Meta) to the commands
526
that display the next buffer in the window at the specified direction.
527
This is like 'windmove-default-keybindings' that binds keys to commands
528 529
that select the window in the specified direction, but additionally it
displays the buffer from the next command in that window.  For example,
530
'S-M-right C-h i' displays the "*Info*" buffer in the right window,
531 532
creating the window if necessary.  A special key can be customized to
display the buffer in the same window, for example, 'S-M-0 C-h e'
533
displays the "*Messages*" buffer in the same window.
534

535 536
*** Windmove also supports directional window deletion.
The new command 'windmove-delete-default-keybindings' binds default
537 538
keys with provided prefix (by default, 'C-x') and modifiers (by default,
'Shift') to the commands that delete the window in the specified
539
direction.  For example, 'C-x S-down' deletes the window below.
540
With a prefix arg 'C-u', also kills the buffer in that window.
541
With 'M-0', deletes the selected window and selects the window
542
that was in the specified direction.
543

544 545 546 547
*** New command 'windmove-swap-states-in-direction' binds default keys
to the commands that swap the states of the selected window with the
window in the specified direction.

548 549 550 551
** Octave mode
The mode is automatically enabled in files that start with the
'function' keyword.

Stefan Monnier's avatar
Stefan Monnier committed
552
** project.el
553

554
*** New commands 'project-search' and 'project-query-replace-regexp'.
Stefan Monnier's avatar
Stefan Monnier committed
555

556 557
*** New customizable variable 'project-read-file-name-function'.

Stefan Monnier's avatar
Stefan Monnier committed
558
** Etags
559

Stefan Monnier's avatar
Stefan Monnier committed
560
+++
561 562 563
*** 'next-file' is now an obsolete alias of 'tags-next-file'.

*** 'tags-loop-revert-buffers' is an obsolete alias of
564
'fileloop-revert-buffers'.
565 566 567

*** The 'tags-loop-continue' function along with the
'tags-loop-operate' and 'tags-loop-scan' variables are now obsolete;
568
use the new 'fileloop-initialize' and 'fileloop-continue' functions
569
instead.
Stefan Monnier's avatar
Stefan Monnier committed
570

571
** bibtex
572 573

---
574
*** New commands 'bibtex-next-entry' and 'bibtex-previous-entry'.
575
In 'bibtex-mode-map', 'forward-paragraph' and 'backward-paragraph' are
576 577
remapped to these, respectively.

578 579
** Dired

580
+++
581 582
*** New command 'dired-create-empty-file'.

583 584 585 586 587
** Find-Dired

*** New customizable variable 'find-dired-refine-function'.
The default value is 'find-dired-sort-by-filename'.

588 589
** Change Logs and VC

Eli Zaretskii's avatar
Eli Zaretskii committed
590 591 592 593 594 595 596 597
*** Recording ChangeLog entries doesn't require an actual file.
If a ChangeLog file doesn't exist, and if the new variable
'add-log-dont-create-changelog-file' is non-nil (which is the
default), commands such as 'C-x 4 a' will add log entries to a
suitable named temporary buffer.  (An existing ChangeLog file will
still be used if it exists.)  Set the variable to nil to get the
previous behavior of always creating a buffer that visits a ChangeLog
file.
598

599 600 601
*** New customizable variable 'vc-find-revision-no-save'.
With non-nil, 'vc-find-revision' doesn't write the created buffer to file.

602 603
*** New customizable variable 'vc-git-grep-template'.
This new variable allows customizing the default arguments passed to
604
'git-grep' when 'vc-git-grep' is used.
605

606
*** Command 'vc-git-stash' now respects marks in the "*vc-dir*" buffer.
607 608 609
When some files are marked, only those are stashed.
When no files are marked, all modified files are stashed, as before.

610 611
*** The new hook 'vc-retrieve-tag-hook' runs after retrieving a tag.

Eli Zaretskii's avatar
Eli Zaretskii committed
612 613 614
---
*** 'vc-hg' now invokes 'smerge-mode' when visiting files.
Code that attempted to invoke 'smerge-mode' when visiting an Hg file
615 616 617 618
with conflicts existed in earlier versions of Emacs, but incorrectly
never detected a conflict due to invalid assumptions about cached
values.

619 620 621 622
+++
*** 'C-u C-x v D' ('vc-root-version-diff') prompts for two revisions
and compares their entire trees.

Ian Dunn's avatar
Ian Dunn committed
623
*** New user option 'vc-hg-revert-switches' specifies switches to pass
624
to Hg revert.
Ian Dunn's avatar
Ian Dunn committed
625

626 627 628 629
*** 'C-x v M D' ('vc-diff-mergebase') and 'C-x v M L' ('vc-log-mergebase')
print diffs and logs between the merge base (common ancestor) of two
given revisions.

630
** Diff mode
631 632
+++
*** Hunks are now automatically refined by font-lock.
633
To disable refinement, set the new user option 'diff-refine' to nil.
634 635
To get back the old behavior where hunks are refined as you navigate
through a diff, set 'diff-refine' to the symbol 'navigate'.
636

637 638 639 640
+++
*** 'diff-auto-refine-mode' is deprecated in favor of 'diff-refine'.
It is no longer enabled by default and binding it no longer has any
effect.
641

642 643 644 645 646 647
+++
*** Better syntax highlighting of Diff hunks.
Fragments of source in Diff hunks are now by default highlighted
according to the appropriate major mode.  Customize the new option
'diff-font-lock-syntax' to nil to disable this.

648
*** File headers can be shortened, mimicking Magit's diff format.
649
To enable it, set the new user option 'diff-font-lock-prettify' to t.
650

651
+++
652 653 654 655
*** Prefix arg of 'diff-goto-source' means jump to the old revision
of the file under version control if point is on an old changed line,
or to the new revision of the file otherwise.

656 657 658
** Texinfo

+++
659
*** New function for inserting '@pxref', '@xref', or '@ref' commands.
660 661
The function 'texinfo-insert-dwim-@ref', bound to 'C-c C-c r' by
default, inserts one of three types of references based on the text
662 663
surrounding point, namely '@pxref' near a parenthesis, '@xref' at the
start of a sentence or at '(point-min)', else '@ref'.
664

665
** Browse-url
666

667 668 669 670
*** 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.

671
** Comint
672

673
+++
674
*** 'send-invisible' is now an obsolete alias for 'comint-send-invisible'.
675 676
Also, 'shell-strip-ctrl-m' is declared obsolete.

677
+++
678
*** 'C-c .' ('comint-insert-previous-argument') no longer interprets '&'.
679 680 681 682 683 684 685 686 687 688 689 690 691 692
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.
693

694 695
** SQL

696 697 698 699 700 701 702 703 704 705 706 707 708
*** SQL Indent Minor Mode
SQL Mode now supports the ELPA 'sql-indent' package for assisting
sophisticated SQL indenting rules.  Note, however, that SQL is not
like other programming languages like C, Java, or Python where code is
sparse and rules for formatting are fairly well established. Instead
SQL is more like COBOL (from which it came) and code tends to be very
dense and line ending decisions driven by syntax and line length
considerations to make readable code.  Experienced SQL developers may
prefer to rely upon existing Emacs facilities for formatting code but
the 'sql-indent' package provides facilities to aid more casual SQL
developers layout queries and complex expressions.

**** 'sql-use-indent-support' (default t) enables SQL indention support.
709
The 'sql-indent' package from ELPA must be installed to get the
710 711
indentation support in 'sql-mode' and 'sql-interactive-mode'.

712
**** 'sql-mode-hook' and 'sql-interactive-mode-hook' changed.
713
Both hook variables have had 'sql-indent-enable' added to their
714
default values. If you have existing customizations to these variables,
715 716
you should make sure that the new default entry is included.

717 718 719 720 721 722 723 724 725 726
*** Connection Wallet
Database passwords can now by stored in NETRC or JSON data files that
may optionally be encrypted. When establishing an interactive session
with the database via 'sql-connect' or a product specific function,
like 'sql-mysql' or 'my-postgres', the password wallet will be
searched for the password. The 'sql-product', 'sql-server',
'sql-database', and the 'sql-username' will be used to identify the
appropriate authorization. This eliminates the discouraged practice of
embedding database passwords in your Emacs initialization.

727
See the 'auth-source' module for complete documentation on the file
728
formats.  By default, the wallet file is expected to be in the
729
'user-emacs-directory', named 'sql-wallet' or '.sql-wallet', with
730 731 732
'.json' (JSON) or no (NETRC) suffix.  Both file formats can optionally
be encrypted with GPG by adding an additional '.gpg' suffix.

733 734 735 736 737
** Term

---
*** 'term-read-noecho' is now obsolete, use 'read-passwd' instead.

738 739 740
** Flymake

+++
741
*** The variable 'flymake-diagnostic-types-alist' is obsolete.
742 743 744
You should instead set properties on known diagnostic symbols, like
':error' and ':warning', as demonstrated in the Flymake manual.

745
*** New customizable variable 'flymake-start-on-save-buffer'.
746 747
Control whether Flymake starts checking the buffer on save.

748
*** Flymake and backend functions may exchange hints about buffer changes.
749 750 751
This enables more efficient backends.  See the docstring of
'flymake-diagnostic-functions' or the Flymake manual for details.

752
+++
753 754
*** 'flymake-start-syntax-check-on-newline' is now obsolete,
use 'post-self-insert-hook' to check on newline.
755

Dmitry Gutov's avatar
Dmitry Gutov committed
756 757 758 759 760
** Ruby

*** The Rubocop Flymake diagnostic function will only run Lint cops if
it can't find the config file.

761 762
*** Rubocop is called with 'bundle exec' if Gemfile mentions it.

763 764
*** New command 'ruby-find-library-file' bound to 'C-c C-f'.

765
** Package
766

767 768 769 770 771 772
*** Change of 'package-check-signature' for packages with multiple sigs
In previous Emacsen, 't' checked that all signatures are valid.
Now 't' only checks that at least one signature is valid and the new 'all'
value needs to be used if you want to enforce that all signatures
are valid.  This only affects packages with multiple signatures.

773
*** New function 'package-get-version' lets packages query their own version.
774
Example use in auctex.el: '(defconst auctex-version (package-get-version))'
775

776
*** New 'package-quickstart' feature.
777 778 779 780 781 782 783
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.
784 785 786

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

787 788 789 790 791 792 793 794 795
** Info

---
*** Info can now follow 'file://' protocol URLs.
The 'file://' URLs in Info documents can now be followed by passing
them to the 'browse-url' function, like the other protocols: ftp,
http, and https.  This allows to have references to local HTML files,
for example.

796 797 798 799 800 801 802
** Xref

+++
*** New command 'xref-find-definitions-at-mouse'.
This command finds definitions of the identifier at the place of a
mouse click event, and is intended to be bound to a mouse event.

803 804 805 806 807
+++
*** Changing 'xref-marker-ring-length' works after 'xref.el' is loaded.
Previously, setting 'xref-marker-ring-length' would only take effect
if set before 'xref.el' was loaded.

808
---
809 810
*** 'xref-find-definitions' now sets the mark at the buffer position
where it was invoked.
811

812
---
813
*** New xref faces 'xref-file-header', 'xref-line-number', 'xref-match'.
814

815 816 817 818 819 820 821 822 823 824 825 826
*** New variable 'xref-show-definitions-function'.
It encapsulates the logic pertinent to showing the result of
'xref-find-definitions'.  The user can change it to customize its
behavior and the display of results.

*** Search results show the buffer even for one hit.
The search-type Xref commands (e.g. 'xref-find-references' or
'project-find-regexp') now show the results buffer even when there is
only one hit.  This can be altered by changing
'xref-show-xrefs-function'.

*** Xref buffers support refreshing the search results.
827
A new command 'xref-revert-buffer' is bound to 'g'.
828

829
** Ecomplete
830

831
*** The ecomplete sorting has changed to a decay-based algorithm.
832
This can be controlled by the new 'ecomplete-sort-predicate' variable.
833

834 835
*** 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'.
836

Paul Eggert's avatar
Paul Eggert committed
837
** Gnus
838

839 840 841 842 843 844
---
*** Gnus now maps imaps to 993 only on old MS-Windows versions.
The nnimap backend used to do this unconditionally to work around
problems on old versions of MS-Windows.  This is now done only for
Windows XP and older.

845 846 847 848 849
+++
*** The nnimap backend now has support for IMAP namespaces.
This feature can be enabled by setting the new 'nnimap-use-namespaces'
server variable to non-nil.

850
+++
851
*** A prefix argument to 'gnus-summary-limit-to-score' will limit reverse.
852 853
Limit to articles with score at below.

Paul Eggert's avatar
Paul Eggert committed
854 855 856
*** The function 'gnus-score-find-favorite-words' has been renamed
from 'gnus-score-find-favourite-words'.

857 858 859 860
---
*** Gmane has been removed as an nnir backend, since Gmane no longer
has a search engine.

861
+++
862 863
*** Splitting mail on common mailing list headers has been added.
See the concept index in the Gnus manual for the 'match-list' entry.
864

865
+++
866
*** nil is no longer an allowed value for 'mm-text-html-renderer'.
867

868
+++
869 870
*** A new Gnus summary mode command, 'S A'
('gnus-summary-attach-article') can be used to attach the current
871 872 873
article(s) to a pre-existing Message buffer, or create a new Message
buffer with the article(s) attached.

874 875 876 877 878
---
*** New option 'nnir-notmuch-filter-group-names-function'.
This option controls whether and how to use Gnus search groups as
'path:' search terms to 'notmuch'.

879 880 881
** erc

---
882
*** 'erc-button-google-url' has been renamed to 'erc-button-search-url'
883 884
and its value has been changed to Duck Duck Go.

885 886 887 888 889
---
*** `erc-send-pre-hook' and `erc-send-this' have been obsoleted.  The
variable to use instead to alter text to be sent is now
`erc-pre-send-function'.

890 891 892 893
** EUDC

*** XEmacs support has been removed.

894 895
** eww/shr

896 897 898 899 900
+++
*** The 'eww' command can now create a new EWW buffer.
Invoking the command with a prefix argument will cause it to create a
new EWW buffer for the URL instead of reusing the default one.

Eli Zaretskii's avatar
Eli Zaretskii committed
901 902 903 904 905
+++
*** The 'd' ('eww-download') command now falls back to current page's URL.
If this command is invoked with no URL at point, it now downloads the
current page instead of signaling an error.

906
*** When opening external links in eww/shr (typically with the
907 908
'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
909 910
has been executed.

911 912 913 914 915
+++
*** New option 'shr-discard-aria-hidden'.
If set, shr will not render tags with attribute 'aria-hidden="true"'.
This attribute is meant to tell screen readers to ignore a tag.

Eli Zaretskii's avatar
Eli Zaretskii committed
916
---
917 918
*** 'shr-tag-ol' now respects the ordered list 'start' attribute.

Paul Eggert's avatar
Paul Eggert committed
919
** Htmlfontify
920

Paul Eggert's avatar
Paul Eggert committed
921 922 923 924 925
*** 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'.

926 927 928
+++
** Enriched mode supports the 'charset' text property.
You can add or modify the 'charset' text properties of text using the
929
'Edit->Text Properties->Special Properties' menu, or by invoking the
930 931 932 933
'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.

934
** Smtpmail
935

936
Authentication mechanisms can be added via external packages, by
937
defining new 'cl-defmethod' of 'smtpmail-try-auth-method'.
938

939
** Footnote mode
940

941 942 943 944
*** Support Hebrew-style footnotes
*** Footnote text lines are now aligned.
Can be controlled via the new variable 'footnote-align-to-fn-text'.

945 946 947 948 949 950 951
** 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'.

952 953 954
---
*** CSS mode, SCSS mode, and Less CSS mode now have support for Imenu.

955 956 957 958 959 960 961
** SGML mode

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

962 963 964 965 966 967 968
** Python mode

---
*** Python mode supports three different font lock decoration levels.
The maximum level is used by default; customize
'font-lock-maximum-decoration' to tone down the decoration.

969 970 971 972 973 974 975
** 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.

976 977
** Help

978
---
979
*** Description of variables and functions give an estimated first release.
980

981
---
982
*** Output format of 'C-h l' ('view-lossage') has changed.
983 984 985 986 987
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'.
988

989 990 991 992
---
*** The list of help commands produced by 'C-h C-h' ('help-for-help')
can now be searched via 'C-s'.

993 994 995
** Ibuffer

---
996
*** New filter 'ibuffer-filter-by-process'; bound to '/E'.
997

998 999 1000 1001 1002
---
*** All mode filters can now accept a list of symbols.
This means you can now easily filter several major modes, as well
as a single mode.

1003 1004
** Search and Replace

1005 1006 1007 1008
*** Isearch supports a prefix argument for 'C-s' ('isearch-repeat-forward')
and 'C-r' ('isearch-repeat-backward').  With a prefix argument, these
commands repeat the search for the specified occurrence of the search string.
A negative argument repeats the search in the opposite direction.
1009 1010
This makes possible also to use a prefix argument for 'M-s .'
('isearch-forward-symbol-at-point') to find the next Nth symbol.
1011

1012 1013 1014 1015 1016 1017 1018 1019
*** To go to the first/last occurrence of the current search string
is possible now with new commands 'isearch-beginning-of-buffer' and
'isearch-end-of-buffer' bound to 'M-s M-<' and 'M-s M->' in Isearch.
With a numeric argument, they go to the Nth absolute occurrence
counting from the beginning/end of the buffer.  This complements
'C-s'/'C-r' that searches for the next Nth relative occurrence
with a numeric argument.

1020
*** 'isearch-lazy-count' shows the current match number and total number
Juri Linkov's avatar
Juri Linkov committed
1021
of matches in the Isearch prompt.  Customizable variables
1022
'lazy-count-prefix-format' and 'lazy-count-suffix-format' define the
Juri Linkov's avatar
Juri Linkov committed
1023 1024 1025
format of the current and the total number of matches in the prompt's
prefix and suffix respectively.

1026 1027
*** 'lazy-highlight-buffer' highlights matches in the full buffer.
It is useful in combination with 'lazy-highlight-cleanup' customized to nil
1028
to leave matches highlighted in the whole buffer after exiting isearch.
1029
Also when 'lazy-highlight-buffer' prepares highlighting in the buffer,
1030
navigation through the matches without flickering is more smooth.
1031
'lazy-highlight-buffer-max-at-a-time' controls the number of matches to
1032 1033
highlight in one iteration while processing the full buffer.

Juri Linkov's avatar
Juri Linkov committed
1034 1035
+++
*** New isearch bindings.
1036

1037 1038
'C-M-w' in isearch changed from 'isearch-del-char' to the new function
'isearch-yank-symbol-or-char'.  'isearch-del-char' is now bound to
1039
'C-M-d'.
Juri Linkov's avatar
Juri Linkov committed
1040

1041
+++
1042
*** New variable 'isearch-yank-on-move' provides options 't' and 'shift'
1043
to extend the search string by yanking text that ends at the new
1044 1045
position after moving point in the current buffer.  'shift' extends
the search string by motion commands while holding down the shift key.
1046

1047 1048 1049
*** 'isearch-allow-scroll' provides new option 'unlimited' to allow
scrolling any distance off screen.

Juri Linkov's avatar
Juri Linkov committed
1050 1051 1052 1053
---
*** Isearch now remembers the regexp-based search mode for words/symbols
and case-sensitivity together with search strings in the search ring.

1054 1055 1056
---
*** Isearch now has its own tool-bar and menu-bar menu.

1057
+++
1058
*** 'flush-lines' prints and returns the number of deleted matching lines.
1059

1060 1061 1062 1063 1064
** Debugger

+++
*** The Lisp Debugger is now based on 'backtrace-mode'.
Backtrace mode adds fontification and commands for changing the
1065 1066
appearance of backtrace frames.  See the node "(elisp) Backtraces" in
the Elisp manual for documentation of the new mode and its commands.
1067

1068 1069 1070 1071
** Edebug

+++
*** The runtime behavior of Edebug's instrumentation can be changed
1072 1073
using the new variables 'edebug-behavior-alist',
'edebug-after-instrumentation-function' and
1074
'edebug-new-definition-function'.  Edebug's behavior can be changed
1075 1076
globally or for individual definitions.

1077
+++
1078 1079
*** Edebug's backtrace buffer now uses 'backtrace-mode'.
Backtrace mode adds fontification, links and commands for changing the
1080 1081
appearance of backtrace frames.  See the node "(elisp) Backtraces" in
the Elisp manual for documentation of the new mode and its commands.
1082

1083 1084 1085 1086 1087 1088 1089 1090 1091
The binding of 'd' in Edebug's keymap is now 'edebug-pop-to-backtrace'
which replaces 'edebug-backtrace'.  Consequently Edebug's backtrace
windows now behave like those of the Lisp Debugger and of ERT, in that
when they appear they will be the selected window.

The new 'backtrace-goto-source' command, bound to 's', works in
Edebug's backtraces on backtrace frames whose source code has
been instrumented by Edebug.

1092 1093
** Enhanced xterm support

Mark Oteiza's avatar
Mark Oteiza committed
1094 1095 1096
*** New variable 'xterm-set-window-title' controls whether Emacs sets
the XTerm window title.  This feature is experimental and is disabled
by default.
1097

1098
** Grep
1099

1100
+++
1101
*** 'rgrep', 'lgrep' and 'zrgrep' now hide part of the command line
1102
that contains a list of ignored directories and files.
1103 1104 1105 1106
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.
1107

Paul Pogonyshev's avatar
Paul Pogonyshev committed