mirror of
git://git.sv.gnu.org/emacs.git
synced 2026-02-18 10:57:34 +00:00
ec18ff5cea
* lisp/net/browse-url.el (browse-url-emacs): Doc fix to follow up the previous change. (Bug#30673) * etc/NEWS: Mention the change in 'browse-url-emacs'.
1585 lines
56 KiB
Text
1585 lines
56 KiB
Text
GNU Emacs NEWS -- history of user-visible changes.
|
||
|
||
Copyright (C) 2017-2018 Free Software Foundation, Inc.
|
||
See the end of the file for license conditions.
|
||
|
||
Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
|
||
If possible, use M-x report-emacs-bug.
|
||
|
||
This file is about changes in Emacs version 27.
|
||
|
||
See file HISTORY for a list of GNU Emacs versions and release dates.
|
||
See files NEWS.26, NEWS.25, ..., NEWS.18, and NEWS.1-17 for changes
|
||
in older Emacs versions.
|
||
|
||
You can narrow news to a specific version by calling 'view-emacs-news'
|
||
with a prefix argument or by typing C-u C-h C-n.
|
||
|
||
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,
|
||
|
||
|
||
* Installation Changes in Emacs 27.1
|
||
|
||
** 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.
|
||
|
||
** 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.
|
||
|
||
** 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
|
||
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.
|
||
|
||
|
||
* Startup Changes in Emacs 27.1
|
||
|
||
+++
|
||
** 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).
|
||
|
||
+++
|
||
** Emacs now calls 'package-initialize' before loading the init file.
|
||
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'
|
||
in your init file. However, if your init file changes the values of
|
||
'package-load-list' or 'package-user-dir', then that code needs to be
|
||
moved to the early init file (see above).
|
||
|
||
|
||
* Changes in Emacs 27.1
|
||
|
||
---
|
||
** 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.
|
||
|
||
---
|
||
** 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.
|
||
|
||
+++
|
||
** 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.
|
||
|
||
+++
|
||
** New function 'logcount' calculates an integer's Hamming weight.
|
||
|
||
+++
|
||
** 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.
|
||
|
||
+++
|
||
** 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.
|
||
|
||
+++
|
||
** 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\}
|
||
|
||
|
||
* Editing Changes in Emacs 27.1
|
||
|
||
+++
|
||
** New isearch bindings.
|
||
'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 'C-M-d'.
|
||
|
||
---
|
||
** 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).
|
||
|
||
+++
|
||
** 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
|
||
typographic quotes, “like this”, in text modes, and in comments in
|
||
non-text modes.
|
||
|
||
---
|
||
** 'write-abbrev-file' now includes special properties.
|
||
'write-abbrev-file' now writes special properties like ':case-fixed'
|
||
for abbrevs that have them.
|
||
|
||
|
||
* Changes in Specialized Modes and Packages in Emacs 27.1
|
||
|
||
** Browse-url
|
||
*** 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.
|
||
|
||
** Ecomplete
|
||
*** The ecomplete sorting has changed to a decay-based algorithm.
|
||
This can be controlled by the new `ecomplete-sort-predicate' variable.
|
||
|
||
*** 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
|
||
|
||
** Gnus
|
||
*** The function 'gnus-score-find-favorite-words' has been renamed
|
||
from 'gnus-score-find-favourite-words'.
|
||
|
||
** 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'.
|
||
|
||
** Smtpmail
|
||
Authentication mechanisms can be added via external packages, by
|
||
defining new cl-defmethod of smtpmail-try-auth-method.
|
||
|
||
** Footnote-mode
|
||
*** Support Hebrew-style footnotes
|
||
*** Footnote text lines are now aligned.
|
||
Can be controlled via the new variable 'footnote-align-to-fn-text'.
|
||
|
||
** 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'.
|
||
|
||
** 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.
|
||
|
||
** Help
|
||
|
||
---
|
||
*** 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'.
|
||
|
||
** Ibuffer
|
||
|
||
---
|
||
*** New filter ibuffer-filter-by-process; bound to '/E'.
|
||
|
||
** Search and Replace
|
||
|
||
*** '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.
|
||
|
||
** Edebug
|
||
|
||
+++
|
||
*** The runtime behavior of Edebug's instrumentation can be changed
|
||
using the new variables 'edebug-behavior-alist',
|
||
'edebug-after-instrumentation-function' and
|
||
'edebug-new-definition-function'. Edebug's behavior can be changed
|
||
globally or for individual definitions.
|
||
|
||
** Enhanced xterm support
|
||
|
||
*** New variable 'xterm-set-window-title' controls whether Emacs sets
|
||
the XTerm window title. This feature is experimental and is disabled
|
||
by default.
|
||
|
||
** Gamegrid
|
||
|
||
** grep
|
||
|
||
*** rgrep, lgrep and zrgrep now hide part of the command line
|
||
that contains a list of ignored directories and files.
|
||
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.
|
||
|
||
** ERT
|
||
|
||
+++
|
||
*** New variable 'ert-quiet' allows to make ERT output in batch mode
|
||
less verbose by removing non-essential information.
|
||
|
||
---
|
||
*** Gamegrid now determines its default glyph size based on display
|
||
dimensions, instead of always using 16 pixels. As a result, Tetris,
|
||
Snake and Pong are more playable on HiDPI displays.
|
||
|
||
** Filecache
|
||
|
||
---
|
||
*** Completing filenames in the minibuffer via 'C-TAB' now uses the
|
||
styles as configured by the variable 'completion-styles'.
|
||
|
||
** New macros 'thunk-let' and 'thunk-let*'.
|
||
These macros are analogue to 'let' and 'let*', but create bindings that
|
||
are evaluated lazily.
|
||
|
||
** next-error
|
||
|
||
*** New customizable variable next-error-find-buffer-function
|
||
defines the logic of finding a next-error capable buffer.
|
||
It has an option to use a single such buffer on selected frame, or
|
||
by default use the last buffer that navigated to the current buffer.
|
||
|
||
** 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)
|
||
|
||
*** The function 'shell-uniquify-list' has been renamed from
|
||
'eshell-uniqify-list'.
|
||
|
||
** Pcomplete
|
||
*** The function 'pcomplete-uniquify-list' has been renamed from
|
||
'pcomplete-uniqify-list'.
|
||
|
||
** Tramp
|
||
|
||
+++
|
||
*** New connection method "owncloud", which allows to access OwnCloud
|
||
or NextCloud hosted files and directories.
|
||
|
||
---
|
||
** The options.el library has been removed.
|
||
It was obsolete since Emacs 22.1, replaced by customize.
|
||
|
||
|
||
* New Modes and Packages in Emacs 27.1
|
||
|
||
+++
|
||
** 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
|
||
names" in the Tramp manual for full documentation of these facilities.
|
||
|
||
|
||
* Incompatible Lisp Changes in Emacs 27.1
|
||
|
||
** 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).
|
||
|
||
---
|
||
** Some functions and variables obsolete since Emacs 22 have been removed:
|
||
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,
|
||
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,
|
||
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,
|
||
isearch-lazy-highlight-cleanup, 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, speedbar-buffers-line-path,
|
||
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,
|
||
tooltip-gud-toggle-dereference, unfocus-frame, unload-hook-features-list,
|
||
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,
|
||
x-lost-selection-hooks, x-sent-selection-hooks
|
||
|
||
|
||
* Lisp Changes in Emacs 27.1
|
||
|
||
+++
|
||
** New function assoc-delete-all.
|
||
|
||
** '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.
|
||
|
||
** 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")
|
||
|
||
** 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.
|
||
The new variable 'comment-use-syntax-ppss' can be set to nil to recover the old
|
||
behavior if needed.
|
||
|
||
** The `server-name' and `server-socket-dir' variables are set when a
|
||
socket has been pased to Emacs (Bug#24218).
|
||
|
||
---
|
||
** The 'file-system-info' function is now available on all platforms.
|
||
instead of just Microsoft platforms. This fixes a 'get-free-disk-space'
|
||
bug on OS X 10.8 and later (Bug#28639).
|
||
|
||
---
|
||
** The function 'get-free-disk-space' returns now a non-nil value for
|
||
remote systems, which support this check.
|
||
|
||
+++
|
||
** 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.
|
||
|
||
** (format "%d" X) no longer mishandles a floating-point number X that
|
||
does not fit in a machine integer (Bug#30408).
|
||
|
||
** 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.
|
||
|
||
---
|
||
** The new function `mailcap-file-name-to-mime-type' has been added.
|
||
It's a simple convenience function for looking up MIME types based on
|
||
file name extensions.
|
||
|
||
+++
|
||
** The new function 'read-answer' accepts either long or short answers
|
||
depending on the new customizable variable 'read-answer-short'.
|
||
|
||
** 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.
|
||
|
||
|
||
* Changes in Emacs 27.1 on Non-Free Operating Systems
|
||
|
||
---
|
||
** Battery status is now supported in all Cygwin builds.
|
||
Previously it was supported only in the Cygwin-w32 build.
|
||
|
||
** Emacs now handles key combinations involving the macOS "command"
|
||
and "option" modifier keys more correctly.
|
||
|
||
** 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
|
||
work as on other platforms.
|
||
|
||
---
|
||
*** All the -options types have been changed to argument lists
|
||
instead of shell command strings. This change affects
|
||
'image-dired-cmd-create-thumbnail-options',
|
||
'image-dired-cmd-create-temp-image-options',
|
||
'image-dired-cmd-rotate-thumbnail-options',
|
||
'image-dired-cmd-rotate-original-options',
|
||
'image-dired-cmd-write-exif-data-options',
|
||
'image-dired-cmd-read-exif-data-options', and introduces
|
||
'image-dired-cmd-pngnq-options', 'image-dired-cmd-pngcrush-options',
|
||
'image-dired-cmd-create-standard-thumbnail-options'.
|
||
|
||
---
|
||
*** Recognizes more tools by default, including pngnq-s9 and OptiPNG.
|
||
|
||
---
|
||
*** 'find-file' and related commands now work on thumbnails and
|
||
displayed images, providing a default argument of the original file name
|
||
via an addition to 'file-name-at-point-functions'.
|
||
|
||
---
|
||
** The default 'Info-default-directory-list' no longer checks some obsolete
|
||
directory suffixes (gnu, gnu/lib, gnu/lib/emacs, emacs, lib, lib/emacs)
|
||
when searching for info directories.
|
||
|
||
+++
|
||
** The commands that add ChangeLog entries now prefer a VCS root directory
|
||
for the ChangeLog file, if none already exists. Customize
|
||
'change-log-directory-files' to nil for the old behavior.
|
||
|
||
---
|
||
** Support for non-string values of 'time-stamp-format' has been removed.
|
||
|
||
** Message
|
||
|
||
---
|
||
*** 'message-use-idna' now defaults to t (because Emacs comes with
|
||
built-in IDNA support now).
|
||
|
||
---
|
||
*** When sending HTML messages with embedded images, and you have
|
||
exiftool installed, and you rotate images with EXIF data (i.e.,
|
||
JPEGs), the rotational information will be inserted into the outgoing
|
||
image in the message. (The original image will not have its
|
||
orientation affected.)
|
||
|
||
---
|
||
*** The 'message-valid-fqdn-regexp' variable has been removed, since
|
||
there are now top-level domains added all the time. Message will no
|
||
longer warn about sending emails to top-level domains it hasn't heard
|
||
about.
|
||
|
||
---
|
||
*** 'message-beginning-of-line' (bound to 'C-a') understands folded headers.
|
||
In 'visual-line-mode' it will look for the true beginning of a header
|
||
while in non-'visual-line-mode' it will move the point to the indented
|
||
header's value.
|
||
|
||
** Package
|
||
|
||
+++
|
||
*** The new variable 'package-gnupghome-dir' has been added to control
|
||
where the GnuPG home directory (used for signature verification) is
|
||
located and whether GnuPG's option '--homedir' is used or not.
|
||
|
||
---
|
||
*** Deleting a package no longer respects 'delete-by-moving-to-trash'.
|
||
|
||
** Python
|
||
|
||
+++
|
||
*** The new variable 'python-indent-def-block-scale' has been added.
|
||
It controls the depth of indentation of arguments inside multi-line
|
||
function signatures.
|
||
|
||
** Tramp
|
||
|
||
+++
|
||
*** The method part of remote file names is mandatory now.
|
||
A valid remote file name starts with "/method:host:" or
|
||
"/method:user@host:".
|
||
|
||
+++
|
||
*** The new pseudo method "-" is a marker for the default method.
|
||
"/-::" is the shortest remote file name then.
|
||
|
||
+++
|
||
*** The command 'tramp-change-syntax' allows you to choose an
|
||
alternative remote file name syntax.
|
||
|
||
+++
|
||
*** New connection method "sg", which supports editing files under a
|
||
different group ID.
|
||
|
||
+++
|
||
*** New connection method "doas" for OpenBSD hosts.
|
||
|
||
+++
|
||
*** New connection method "gdrive", which allows access to Google
|
||
Drive onsite repositories.
|
||
|
||
+++
|
||
*** Gateway methods in Tramp have been removed.
|
||
Instead, the Tramp manual documents how to configure ssh and PuTTY
|
||
accordingly.
|
||
|
||
+++
|
||
*** Setting the "ENV" environment variable in
|
||
'tramp-remote-process-environment' enables reading of shell
|
||
initialization files.
|
||
|
||
---
|
||
*** Tramp is able now to send SIGINT to remote asynchronous processes.
|
||
|
||
---
|
||
*** Variable 'tramp-completion-mode' is obsoleted.
|
||
|
||
---
|
||
** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
|
||
|
||
** JS mode
|
||
|
||
---
|
||
*** JS mode now sets 'comment-multi-line' to t.
|
||
|
||
---
|
||
*** New variable 'js-indent-align-list-continuation', when set to nil,
|
||
will not align continuations of bracketed lists, but will indent them
|
||
by the fixed width 'js-indent-level'.
|
||
|
||
** CSS mode
|
||
|
||
---
|
||
*** Support for completing attribute values, at-rules, bang-rules,
|
||
HTML tags, classes and IDs using the 'completion-at-point' command.
|
||
Completion candidates for HTML classes and IDs are retrieved from open
|
||
HTML mode buffers.
|
||
|
||
---
|
||
*** CSS mode now binds 'C-h S' to a function that will show
|
||
information about a CSS construct (an at-rule, property, pseudo-class,
|
||
pseudo-element, with the default being guessed from context). By
|
||
default the information is looked up on the Mozilla Developer Network,
|
||
but this can be customized using 'css-lookup-url-format'.
|
||
|
||
---
|
||
*** CSS colors are fontified using the color they represent as the
|
||
background. For instance, #ff0000 would be fontified with a red
|
||
background.
|
||
|
||
+++
|
||
** Emacs now supports character name escape sequences in character and
|
||
string literals. The syntax variants '\N{character name}' and
|
||
'\N{U+code}' are supported.
|
||
|
||
+++
|
||
** Prog mode has some support for multi-mode indentation.
|
||
This allows better indentation support in modes that support multiple
|
||
programming languages in the same buffer, like literate programming
|
||
environments or ANTLR programs with embedded Python code.
|
||
|
||
A major mode can provide indentation context for a sub-mode. To
|
||
support this, modes should use 'prog-first-column' instead of a
|
||
literal zero and avoid calling 'widen' in their indentation functions.
|
||
See the node "(elisp) Mode-Specific Indent" in the ELisp manual for
|
||
more details.
|
||
|
||
** ERC
|
||
|
||
---
|
||
*** New variable 'erc-default-port-tls' used to connect to TLS IRC
|
||
servers.
|
||
|
||
** URL
|
||
|
||
+++
|
||
*** The new function 'url-cookie-delete-cookie' can be used to
|
||
programmatically delete all cookies, or cookies from a specific
|
||
domain.
|
||
|
||
+++
|
||
*** 'url-retrieve-synchronously' now takes an optional timeout parameter.
|
||
|
||
---
|
||
*** The URL package now supports HTTPS over proxies supporting CONNECT.
|
||
|
||
+++
|
||
*** 'url-user-agent' now defaults to 'default', and the User-Agent
|
||
string is computed dynamically based on 'url-privacy-level'.
|
||
|
||
** VC and related modes
|
||
|
||
+++
|
||
*** 'vc-dir-mode' now binds 'vc-log-outgoing' to 'O'; and has various
|
||
branch-related commands on a keymap bound to 'B'.
|
||
|
||
+++
|
||
*** 'vc-region-history' is now bound to 'C-x v h', replacing the older
|
||
'vc-insert-headers' binding.
|
||
|
||
*** New user option 'vc-git-print-log-follow' to follow renames in Git logs
|
||
for a single file.
|
||
|
||
** CC mode
|
||
|
||
---
|
||
*** Opening a .h file will turn C or C++ mode depending on language used.
|
||
This is done with the help of the 'c-or-c++-mode' function, which
|
||
analyzes buffer contents to infer whether it's a C or C++ source file.
|
||
|
||
---
|
||
** New option 'cpp-message-min-time-interval' to allow user control
|
||
of progress messages in cpp.el.
|
||
|
||
---
|
||
** New DNS mode command 'dns-mode-ipv6-to-nibbles' to convert IPv6 addresses
|
||
to a format suitable for reverse lookup zone files.
|
||
|
||
** Ispell
|
||
|
||
+++
|
||
*** Enchant is now supported as a spell-checker.
|
||
|
||
Enchant is a meta-spell-checker that uses providers such as Hunspell
|
||
to do the actual checking. With it, users can use spell-checkers not
|
||
directly supported by Emacs, such as Voikko, Hspell and AppleSpell,
|
||
more easily share personal word-lists with other programs, and
|
||
configure different spelling-checkers for different languages.
|
||
(Version 2.1.0 or later of Enchant is required.)
|
||
|
||
** Flymake
|
||
|
||
+++
|
||
*** Flymake has been completely redesigned
|
||
|
||
Flymake now annotates arbitrary buffer regions, not just lines. It
|
||
supports arbitrary diagnostic types, not just errors and warnings (see
|
||
variable 'flymake-diagnostic-types-alist').
|
||
|
||
It also supports multiple simultaneous backends, meaning that you can
|
||
check your buffer from different perspectives (see variable
|
||
'flymake-diagnostic-functions'). Backends for Emacs Lisp mode are
|
||
provided.
|
||
|
||
The old Flymake behavior is preserved in the so-called "legacy
|
||
backend", which has been updated to benefit from the new UI features.
|
||
|
||
** Term
|
||
|
||
---
|
||
*** 'term-char-mode' now makes its buffer read-only.
|
||
|
||
The buffer is made read-only to prevent changes from being made by
|
||
anything other than the process filter; and movements of point away
|
||
from the process mark are counter-acted so that the cursor is in the
|
||
correct position after each command. This is needed to avoid states
|
||
which are inconsistent with the state of the terminal understood by
|
||
the inferior process.
|
||
|
||
New user options 'term-char-mode-buffer-read-only' and
|
||
'term-char-mode-point-at-process-mark' control these behaviors, and
|
||
are non-nil by default. Customize these options to nil if you want
|
||
the previous behavior.
|
||
|
||
** Xref
|
||
|
||
+++
|
||
*** When an *xref* buffer is needed, 'TAB' quits and jumps to an xref.
|
||
|
||
A new command 'xref-quit-and-goto-xref', bound to 'TAB' in *xref*
|
||
buffers, quits the window before jumping to the destination. In many
|
||
situations, the intended window configuration is restored, just as if
|
||
the *xref* buffer hadn't been necessary in the first place.
|
||
|
||
|
||
* New Modes and Packages in Emacs 26.1
|
||
|
||
---
|
||
** New Elisp data-structure library 'radix-tree'.
|
||
|
||
---
|
||
** New library 'xdg' with utilities for some XDG standards and specs.
|
||
|
||
** HTML
|
||
|
||
+++
|
||
*** A new submode of 'html-mode', 'mhtml-mode', is now the default
|
||
mode for *.html files. This mode handles indentation,
|
||
fontification, and commenting for embedded JavaScript and CSS.
|
||
|
||
---
|
||
** New mode 'conf-toml-mode' is a sub-mode of 'conf-mode', specialized
|
||
for editing TOML files.
|
||
|
||
---
|
||
** New mode 'conf-desktop-mode' is a sub-mode of 'conf-unix-mode',
|
||
specialized for editing freedesktop.org desktop entries.
|
||
|
||
---
|
||
** New minor mode 'pixel-scroll-mode' provides smooth pixel-level scrolling.
|
||
|
||
---
|
||
** New major mode 'less-css-mode' (a minor variant of 'css-mode') for
|
||
editing Less files.
|
||
|
||
|
||
* Incompatible Lisp Changes in Emacs 26.1
|
||
|
||
---
|
||
** 'password-data' is now a hash-table so that 'password-read' can use
|
||
any object for the 'key' argument.
|
||
|
||
+++
|
||
** Command 'dired-mark-extension' now automatically prepends a '.' to the
|
||
extension when not present. The new command 'dired-mark-suffix' behaves
|
||
similarly but it doesn't prepend a '.'.
|
||
|
||
+++
|
||
** Certain cond/pcase/cl-case forms are now compiled using a faster jump
|
||
table implementation. This uses a new bytecode op 'switch', which
|
||
isn't compatible with previous Emacs versions. This functionality can
|
||
be disabled by setting 'byte-compile-cond-use-jump-table' to nil.
|
||
|
||
+++
|
||
** If 'comment-auto-fill-only-comments' is non-nil, 'auto-fill-function'
|
||
is now called only if either no comment syntax is defined for the
|
||
current buffer or the self-insertion takes place within a comment.
|
||
|
||
---
|
||
** The alist 'ucs-names' is now a hash table.
|
||
|
||
---
|
||
** 'if-let' and 'when-let' are subsumed by 'if-let*' and 'when-let*'.
|
||
The incumbent 'if-let' and 'when-let' are now marked obsolete.
|
||
'if-let*' and 'when-let*' do not accept the single tuple special case.
|
||
New macro 'and-let*' is an implementation of the Scheme SRFI-2 syntax
|
||
of the same name. 'if-let*' and 'when-let*' now accept the same
|
||
binding syntax as 'and-let*'.
|
||
|
||
---
|
||
** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
|
||
mode to send the same escape sequences that xterm does. This makes
|
||
things like 'forward-word' in readline work.
|
||
|
||
---
|
||
** Customizable variable 'query-replace-from-to-separator'
|
||
now doesn't propertize the string value of the separator.
|
||
Instead, text properties are added by 'query-replace-read-from'.
|
||
Additionally, the new nil value restores pre-24.5 behavior
|
||
of not providing replacement pairs via the history.
|
||
|
||
---
|
||
** Some obsolete functions, variables, and faces have been removed:
|
||
|
||
*** 'make-variable-frame-local'. Variables cannot be frame-local any more.
|
||
|
||
*** From subr.el: 'window-dot', 'set-window-dot', 'read-input',
|
||
'show-buffer', 'eval-current-buffer', 'string-to-int'.
|
||
|
||
*** 'icomplete-prospects-length'.
|
||
|
||
*** All the default-FOO variables that hold the default value of the
|
||
FOO variable. Use 'default-value' and 'setq-default' to access and
|
||
change FOO, respectively. The exhaustive list of removed variables is:
|
||
'default-mode-line-format', 'default-header-line-format',
|
||
'default-line-spacing', 'default-abbrev-mode', 'default-ctl-arrow',
|
||
'default-truncate-lines', 'default-left-margin', 'default-tab-width',
|
||
'default-case-fold-search', 'default-left-margin-width',
|
||
'default-right-margin-width', 'default-left-fringe-width',
|
||
'default-right-fringe-width', 'default-fringes-outside-margins',
|
||
'default-scroll-bar-width', 'default-vertical-scroll-bar',
|
||
'default-indicate-empty-lines', 'default-indicate-buffer-boundaries',
|
||
'default-fringe-indicator-alist', 'default-fringe-cursor-alist',
|
||
'default-scroll-up-aggressively', 'default-scroll-down-aggressively',
|
||
'default-fill-column', 'default-cursor-type',
|
||
'default-cursor-in-non-selected-windows',
|
||
'default-buffer-file-coding-system', 'default-major-mode', and
|
||
'default-enable-multibyte-characters'.
|
||
|
||
*** Many variables obsoleted in 22.1 referring to face symbols.
|
||
|
||
+++
|
||
** The variable 'text-quoting-style' is now a customizable option. It
|
||
controls whether to and how to translate ASCII quotes in messages and
|
||
help output. Its possible values and their semantics remain unchanged
|
||
from Emacs 25. In particular, when this variable's value is 'grave',
|
||
all quotes in formats are output as-is.
|
||
|
||
---
|
||
** Functions like 'check-declare-file' and 'check-declare-directory'
|
||
now generate less chatter and more-compact diagnostics. The auxiliary
|
||
function 'check-declare-errmsg' has been removed.
|
||
|
||
+++
|
||
** The regular expression character class '[:blank:]' now matches
|
||
Unicode horizontal whitespace as defined in the Unicode Technical
|
||
Standard #18. If you only want to match space and tab, use '[ \t]'
|
||
instead.
|
||
|
||
+++
|
||
** 'min' and 'max' no longer round their results.
|
||
Formerly, they returned a floating-point value if any argument was
|
||
floating-point, which was sometimes numerically incorrect. For
|
||
example, on a 64-bit host (max 1e16 10000000000000001) now returns its
|
||
second argument instead of its first.
|
||
|
||
+++
|
||
** The variable 'old-style-backquotes' has been made internal and
|
||
renamed to 'lread--old-style-backquotes'. No user code should use
|
||
this variable.
|
||
|
||
+++
|
||
** 'default-file-name-coding-system' now defaults to a coding system
|
||
that does not process CRLF. For example, it defaults to 'utf-8-unix'
|
||
instead of to 'utf-8'. Before this change, Emacs would sometimes
|
||
mishandle file names containing these control characters.
|
||
|
||
+++
|
||
** 'file-attributes', 'file-symlink-p' and 'make-symbolic-link' no
|
||
longer quietly mutate the target of a local symbolic link, so that
|
||
Emacs can access and copy them reliably regardless of their contents.
|
||
The following changes are involved.
|
||
|
||
---
|
||
*** 'file-attributes' and 'file-symlink-p' no longer prepend "/:" to
|
||
symbolic links whose targets begin with "/" and contain ":". For
|
||
example, if a symbolic link "x" has a target "/y:z:", '(file-symlink-p
|
||
"x")' now returns "/y:z:" rather than "/:/y:z:".
|
||
|
||
---
|
||
*** 'make-symbolic-link' no longer looks for file name handlers of
|
||
target when creating a symbolic link. For example,
|
||
'(make-symbolic-link "/y:z:" "x")' now creates a symbolic link to
|
||
"/y:z:" instead of failing.
|
||
|
||
+++
|
||
*** 'make-symbolic-link' removes the remote part of a link target if
|
||
target and newname have the same remote part. For example,
|
||
'(make-symbolic-link "/x:y:a" "/x:y:b")' creates a link with the
|
||
literal string "a"; and '(make-symbolic-link "/x:y:a" "/x:z:b")'
|
||
creates a link with the literal string "/x:y:a" instead of failing.
|
||
|
||
+++
|
||
*** 'make-symbolic-link' now expands a link target with leading "~"
|
||
only when the optional third arg is an integer, as when invoked
|
||
interactively. For example, '(make-symbolic-link "~y" "x")' now
|
||
creates a link with target the literal string "~y"; to get the old
|
||
behavior, use '(make-symbolic-link (expand-file-name "~y") "x")'. To
|
||
avoid this expansion in interactive use, you can now prefix the link
|
||
target with "/:". For example, '(make-symbolic-link "/:~y" "x" 1)'
|
||
now creates a link to literal "~y".
|
||
|
||
+++
|
||
** 'file-truename' returns a quoted file name if the target of a
|
||
symbolic link has remote file name syntax.
|
||
|
||
+++
|
||
** Module functions are now implemented slightly differently; in
|
||
particular, the function 'internal--module-call' has been removed.
|
||
Code that depends on undocumented internals of the module system might
|
||
break.
|
||
|
||
---
|
||
** The argument LOCKNAME of 'write-region' is propagated to file name
|
||
handlers now.
|
||
|
||
---
|
||
** When built against recent versions of GTK+, Emacs always uses
|
||
gtk_window_move for moving frames and ignores the value of the
|
||
variable 'x-gtk-use-window-move'. The variable is now obsolete.
|
||
|
||
+++
|
||
** Several functions that create or rename files now treat their
|
||
destination argument specially only when it is a directory name, i.e.,
|
||
when it ends in '/' on GNU and other POSIX-like systems. When the
|
||
destination argument D of one of these functions is an existing
|
||
directory and the intent is to act on an entry in that directory, D
|
||
should now be a directory name. For example, (rename-file "e" "f/")
|
||
renames to 'f/e'. Although this formerly happened sometimes even when
|
||
D was not a directory name, as in (rename-file "e" "f") where 'f'
|
||
happened to be a directory, the old behavior often contradicted the
|
||
documentation and had inherent races that led to security holes. A
|
||
call like (rename-file C D) that used the old, undocumented behavior
|
||
can be written as (rename-file C (file-name-as-directory D)), a
|
||
formulation portable to both older and newer versions of Emacs.
|
||
Affected functions include 'add-name-to-file', 'copy-directory',
|
||
'copy-file', 'format-write-file', 'gnus-copy-file',
|
||
'make-symbolic-link', 'rename-file', 'thumbs-rename-images', and
|
||
'write-file'.
|
||
|
||
---
|
||
** The list returned by 'overlays-at' is now in decreasing priority order.
|
||
The documentation of this function always said the order should be
|
||
that of decreasing priority, if the 2nd argument of the function is
|
||
non-nil, but the code returned the list in the increasing order of
|
||
priority instead. Now the code does what the documentation says it
|
||
should do.
|
||
|
||
+++
|
||
** 'format' now avoids allocating a new string in more cases.
|
||
'format' was previously documented to return a newly-allocated string,
|
||
but this documentation was not correct, as (eq x (format x)) returned
|
||
t when x was the empty string. 'format' is no longer documented to
|
||
return a newly-allocated string, and the implementation now takes
|
||
advantage of the doc change to avoid making copies of strings in
|
||
common cases like (format "foo") and (format "%s" "foo").
|
||
|
||
---
|
||
** 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.
|
||
|
||
---
|
||
** Using '&rest' or '&optional' incorrectly is now an error.
|
||
For example giving '&optional' without a following variable, or
|
||
passing '&optional' multiple times:
|
||
|
||
(defun foo (&optional &rest x))
|
||
(defun bar (&optional &optional x))
|
||
|
||
Previously, Emacs would just ignore the extra keyword, or give
|
||
incorrect results in certain cases.
|
||
|
||
---
|
||
** The pinentry.el library has been removed.
|
||
That package (and the corresponding change in GnuPG and pinentry)
|
||
was intended to provide a way to input passphrase through Emacs with
|
||
GnuPG 2.0. However, the change to support that was only implemented
|
||
in GnuPG >= 2.1 and didn't get backported to GnuPG 2.0. And with
|
||
GnuPG 2.1 and later, pinentry.el is not needed at all. So the
|
||
library was useless, and we removed it. GnuPG 2.0 is no longer
|
||
supported by the upstream project.
|
||
|
||
To adapt to the change, you may need to set 'epa-pinentry-mode' to the
|
||
symbol 'loopback'.
|
||
|
||
Note that previously, it was said that passphrase input through
|
||
minibuffer would be much less secure than other graphical pinentry
|
||
programs. However, these days the difference is insignificant: the
|
||
'read-password' function sufficiently protects input from leakage to
|
||
message logs. Emacs still doesn't use secure memory to protect
|
||
passphrases, but it was also removed from other pinentry programs as
|
||
the attack is unrealistic on modern computer systems which don't
|
||
utilize swap memory usually.
|
||
|
||
|
||
* Lisp Changes in Emacs 26.1
|
||
|
||
+++
|
||
** The function 'assoc' now takes an optional third argument TESTFN.
|
||
This argument, when non-nil, is used for comparison instead of
|
||
'equal'.
|
||
|
||
+++
|
||
** New optional argument TESTFN in 'alist-get', 'map-elt' and 'map-put'.
|
||
If non-nil, the argument specifies a function to use for comparison,
|
||
instead of, respectively, 'assq' and 'eql'.
|
||
|
||
+++
|
||
** New function 'seq-set-equal-p' to check if SEQUENCE1 and SEQUENCE2
|
||
contain the same elements, regardless of the order.
|
||
|
||
+++
|
||
** The new function 'mapbacktrace' applies a function to all frames of
|
||
the current stack trace.
|
||
|
||
+++
|
||
** The new function 'file-name-case-insensitive-p' tests whether a
|
||
given file is on a case-insensitive filesystem.
|
||
|
||
+++
|
||
** Several accessors for the value returned by 'file-attributes'
|
||
have been added. They are: 'file-attribute-type',
|
||
'file-attribute-link-number', 'file-attribute-user-id',
|
||
'file-attribute-group-id', 'file-attribute-access-time',
|
||
'file-attribute-modification-time',
|
||
'file-attribute-status-change-time', 'file-attribute-size',
|
||
'file-attribute-modes', 'file-attribute-inode-number',
|
||
'file-attribute-device-number' and 'file-attribute-collect'.
|
||
|
||
+++
|
||
** The new function 'buffer-hash' computes a fast, non-consing hash of
|
||
a buffer's contents.
|
||
|
||
+++
|
||
** 'interrupt-process' now consults the list 'interrupt-process-functions',
|
||
to determine which function has to be called in order to deliver the
|
||
SIGINT signal. This allows Tramp to send the SIGINT signal to remote
|
||
asynchronous processes. The hitherto existing implementation has been
|
||
moved to 'internal-default-interrupt-process'.
|
||
|
||
+++
|
||
** The new function 'read-multiple-choice' prompts for multiple-choice
|
||
questions, with a handy way to display help texts.
|
||
|
||
---
|
||
** 'comment-indent-function' values may now return a cons to specify a
|
||
range of indentation.
|
||
|
||
+++
|
||
** New optional argument TEXT in 'make-temp-file'.
|
||
|
||
---
|
||
** New function 'define-symbol-prop'.
|
||
|
||
+++
|
||
** New function 'secure-hash-algorithms' to list the algorithms that
|
||
'secure-hash' supports.
|
||
See the node "(elisp) Checksum/Hash" in the ELisp manual for details.
|
||
|
||
+++
|
||
** Emacs now exposes the GnuTLS cryptographic API with the functions
|
||
'gnutls-macs' and 'gnutls-hash-mac'; 'gnutls-digests' and
|
||
'gnutls-hash-digest'; 'gnutls-ciphers' and 'gnutls-symmetric-encrypt'
|
||
and 'gnutls-symmetric-decrypt'.
|
||
See the node "(elisp) GnuTLS Cryptography" in the ELisp manual for details.
|
||
|
||
+++
|
||
** The function 'gnutls-available-p' now returns a list of capabilities
|
||
supported by the GnuTLS library used by Emacs.
|
||
|
||
+++
|
||
** Emacs now supports records for user-defined types, via the new
|
||
functions 'make-record', 'record', and 'recordp'. Records are now
|
||
used internally to represent cl-defstruct and defclass instances, for
|
||
example.
|
||
|
||
If your program defines new record types, you should use
|
||
package-naming conventions for naming those types. This is so any
|
||
potential conflicts with other types are avoided.
|
||
|
||
+++
|
||
** 'save-some-buffers' now uses 'save-some-buffers-default-predicate'
|
||
to decide which buffers to ask about, if the PRED argument is nil.
|
||
The default value of 'save-some-buffers-default-predicate' is nil,
|
||
which means ask about all file-visiting buffers.
|
||
|
||
---
|
||
** string-(to|as|make)-(uni|multi)byte are now declared obsolete.
|
||
|
||
+++
|
||
** New variable 'while-no-input-ignore-events' which allow
|
||
setting which special events 'while-no-input' should ignore.
|
||
It is a list of symbols.
|
||
|
||
---
|
||
** New function 'undo-amalgamate-change-group' to get rid of
|
||
undo-boundaries between two states.
|
||
|
||
---
|
||
** New var 'definition-prefixes' is a hash table mapping prefixes to
|
||
the files where corresponding definitions can be found. This can be
|
||
used to fetch definitions that are not yet loaded, for example for
|
||
'C-h f'.
|
||
|
||
---
|
||
** New var 'syntax-ppss-table' to control the syntax-table used in
|
||
'syntax-ppss'.
|
||
|
||
+++
|
||
** 'define-derived-mode' can now specify an :after-hook form, which
|
||
gets evaluated after the new mode's hook has run. This can be used to
|
||
incorporate configuration changes made in the mode hook into the
|
||
mode's setup.
|
||
|
||
---
|
||
** Autoload files can be generated without timestamps,
|
||
by setting 'autoload-timestamps' to nil.
|
||
FIXME As an experiment, nil is the current default.
|
||
If no insurmountable problems before next release, it can stay that way.
|
||
|
||
---
|
||
** 'gnutls-boot' now takes a parameter ':complete-negotiation' that
|
||
says that negotiation should complete even on non-blocking sockets.
|
||
|
||
---
|
||
** There is now a new variable 'flyspell-sort-corrections-function'
|
||
that allows changing the way corrections are sorted.
|
||
|
||
---
|
||
** The new command 'fortune-message' has been added, which displays
|
||
fortunes in the echo area.
|
||
|
||
+++
|
||
** New function 'func-arity' returns information about the argument list
|
||
of an arbitrary function. This generalizes 'subr-arity' for functions
|
||
that are not built-in primitives. We recommend using this new
|
||
function instead of 'subr-arity'.
|
||
|
||
---
|
||
** New function 'region-bounds' can be used in the interactive spec
|
||
to provide region boundaries (for rectangular regions more than one)
|
||
to an interactively callable function as a single argument instead of
|
||
two separate arguments 'region-beginning' and 'region-end'.
|
||
|
||
+++
|
||
** 'parse-partial-sexp' state has a new element. Element 10 is
|
||
non-nil when the last character scanned might be the first character
|
||
of a two character construct, i.e., a comment delimiter or escaped
|
||
character. Its value is the syntax of that last character.
|
||
|
||
+++
|
||
** 'parse-partial-sexp's state, element 9, has now been confirmed as
|
||
permanent and documented, and may be used by Lisp programs. Its value
|
||
is a list of currently open parenthesis positions, starting with the
|
||
outermost parenthesis.
|
||
|
||
---
|
||
** 'read-color' will now display the color names using the color itself
|
||
as the background color.
|
||
|
||
---
|
||
** The function 'redirect-debugging-output' now works on platforms
|
||
other than GNU/Linux.
|
||
|
||
+++
|
||
** The new function 'string-version-lessp' compares strings by
|
||
interpreting consecutive runs of numerical characters as numbers, and
|
||
compares their numerical values. According to this predicate,
|
||
"foo2.png" is smaller than "foo12.png".
|
||
|
||
---
|
||
** Numeric comparisons and 'logb' no longer return incorrect answers
|
||
due to internal rounding errors. For example, '(< most-positive-fixnum
|
||
(+ 1.0 most-positive-fixnum))' now correctly returns t on 64-bit hosts.
|
||
|
||
---
|
||
** The functions 'ffloor', 'fceiling', 'ftruncate' and 'fround' now
|
||
accept only floating-point arguments, as per their documentation.
|
||
Formerly, they quietly accepted integer arguments and sometimes
|
||
returned nonsensical answers, e.g., '(< N (ffloor N))' could return t.
|
||
|
||
---
|
||
** On hosts like GNU/Linux x86-64 where a 'long double' fraction
|
||
contains at least EMACS_INT_WIDTH - 3 bits, 'format' no longer returns
|
||
incorrect answers due to internal rounding errors when formatting
|
||
Emacs integers with '%e', '%f', or '%g' conversions. For example, on
|
||
these hosts '(eql N (string-to-number (format "%.0f" N)))' now returns
|
||
t for all Emacs integers N.
|
||
|
||
---
|
||
** Calls that accept floating-point integers (for use on hosts with
|
||
limited integer range) now signal an error if arguments are not
|
||
integral. For example '(decode-char 'ascii 0.5)' now signals an
|
||
error.
|
||
|
||
---
|
||
** Functions 'string-trim-left', 'string-trim-right' and 'string-trim'
|
||
now accept optional arguments which specify the regexp of a substring
|
||
to trim.
|
||
|
||
+++
|
||
** The new function 'char-from-name' converts a Unicode name string
|
||
to the corresponding character code.
|
||
|
||
+++
|
||
** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
|
||
Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
|
||
two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
|
||
('sxhash-eql') on them will be the same.
|
||
|
||
+++
|
||
** Function 'sxhash' has been renamed to 'sxhash-equal' for
|
||
consistency with the new functions. For compatibility, 'sxhash'
|
||
remains as an alias to 'sxhash-equal'.
|
||
|
||
+++
|
||
** 'make-hash-table' now defaults to a rehash threshold of 0.8125
|
||
instead of 0.8, to avoid rounding glitches.
|
||
|
||
+++
|
||
** New function 'add-variable-watcher' can be used to call a function
|
||
when a symbol's value is changed. This is used to implement the new
|
||
debugger command 'debug-on-variable-change'.
|
||
|
||
+++
|
||
** New variable 'print-escape-control-characters' causes 'prin1' and
|
||
'print' to output control characters as backslash sequences.
|
||
|
||
+++
|
||
** Time conversion functions that accept a time zone rule argument now
|
||
allow it to be OFFSET or a list (OFFSET ABBR), where the integer
|
||
OFFSET is a count of seconds east of Universal Time, and the string
|
||
ABBR is a time zone abbreviation. The affected functions are
|
||
'current-time-string', 'current-time-zone', 'decode-time',
|
||
'format-time-string', and 'set-time-zone-rule'.
|
||
|
||
+++
|
||
** 'format-time-string' now formats '%q' to the calendar quarter.
|
||
|
||
+++
|
||
** New built-in function 'mapcan'.
|
||
It avoids unnecessary consing (and garbage collection).
|
||
|
||
+++
|
||
** 'car' and 'cdr' compositions 'cXXXr' and 'cXXXXr' are now part of Elisp.
|
||
|
||
+++
|
||
** 'gensym' is now part of Elisp.
|
||
|
||
---
|
||
** Low-level list functions like 'length' and 'member' now do a better
|
||
job of signaling list cycles instead of looping indefinitely.
|
||
|
||
+++
|
||
** The new functions 'make-nearby-temp-file' and 'temporary-file-directory'
|
||
can be used for creation of temporary files on remote or mounted directories.
|
||
|
||
+++
|
||
** On GNU platforms when operating on a local file, 'file-attributes'
|
||
no longer suffers from a race when called while another process is
|
||
altering the filesystem. On non-GNU platforms 'file-attributes'
|
||
attempts to detect the race, and returns nil if it does so.
|
||
|
||
+++
|
||
** The new function 'file-local-name' can be used to specify arguments
|
||
of remote processes.
|
||
|
||
+++
|
||
** The new functions 'file-name-quote', 'file-name-unquote' and
|
||
'file-name-quoted-p' can be used to quote / unquote file names with
|
||
the prefix "/:".
|
||
|
||
+++
|
||
** The new error 'file-missing', a subcategory of 'file-error', is now
|
||
signaled instead of 'file-error' if a file operation acts on a file
|
||
that does not exist.
|
||
|
||
+++
|
||
** The function 'delete-directory' no longer signals an error when
|
||
operating recursively and when some other process deletes the directory
|
||
or its files before 'delete-directory' gets to them.
|
||
|
||
+++
|
||
** New error type 'user-search-failed' like 'search-failed' but
|
||
avoids debugger like 'user-error'.
|
||
|
||
+++
|
||
** The function 'line-number-at-pos' now takes a second optional
|
||
argument 'absolute'. If this parameter is nil, the default, this
|
||
function keeps on returning the line number taking potential narrowing
|
||
into account. If this parameter is non-nil, the function ignores
|
||
narrowing and returns the absolute line number.
|
||
|
||
---
|
||
** The function 'color-distance' now takes a second optional argument
|
||
'metric'. When non-nil, it should be a function of two arguments that
|
||
accepts two colors and returns a number.
|
||
|
||
** Changes in Frame and Window Handling
|
||
|
||
+++
|
||
*** Resizing a frame no longer runs 'window-configuration-change-hook'.
|
||
'window-size-change-functions' should be used instead.
|
||
|
||
+++
|
||
*** The new function 'frame-size-changed-p' can tell whether a frame has
|
||
been resized since the last time 'window-size-change-functions' has been
|
||
run.
|
||
|
||
+++
|
||
*** The function 'frame-geometry' now also returns the width of a
|
||
frame's outer border.
|
||
|
||
+++
|
||
*** New frame parameters and changed semantics for older ones:
|
||
|
||
+++
|
||
**** 'z-group' positions a frame above or below all others.
|
||
|
||
+++
|
||
**** 'min-width' and 'min-height' specify the absolute minimum size of a
|
||
frame.
|
||
|
||
+++
|
||
**** 'parent-frame' makes a frame the child frame of another Emacs
|
||
frame. The section "(elisp) Child Frames" in the ELisp manual
|
||
describes the intrinsics of that relationship.
|
||
|
||
+++
|
||
**** 'delete-before' triggers deletion of one frame before that of
|
||
another.
|
||
|
||
+++
|
||
**** 'mouse-wheel-frame' specifies another frame whose windows shall be
|
||
scrolled instead.
|
||
|
||
+++
|
||
**** 'no-other-frame' has 'next-frame' and 'previous-frame' skip this
|
||
frame.
|
||
|
||
+++
|
||
**** 'skip-taskbar' removes a frame's icon from the taskbar and has
|
||
'Alt-<TAB>' skip this frame.
|
||
|
||
+++
|
||
**** 'no-focus-on-map' avoids that a frame gets input focus when mapped.
|
||
|
||
+++
|
||
**** 'no-accept-focus' means that a frame does not want to get input
|
||
focus via the mouse.
|
||
|
||
+++
|
||
**** 'undecorated' removes the window manager decorations from a frame.
|
||
|
||
+++
|
||
**** 'override-redirect' tells the window manager to disregard this
|
||
frame.
|
||
|
||
+++
|
||
**** 'width' and 'height' now allow the specification of pixel values
|
||
and ratios.
|
||
|
||
+++
|
||
**** 'left' and 'top' now allow the specification of ratios.
|
||
|
||
+++
|
||
**** 'keep-ratio' preserves size and position of child frames when their
|
||
parent frame is resized.
|
||
|
||
+++
|
||
**** 'no-special-glyphs' suppresses display of truncation and
|
||
continuation glyphs in a frame.
|
||
|
||
+++
|
||
**** 'auto-hide-function' and 'minibuffer-exit' handle auto hiding of
|
||
frames and exiting from minibuffer individually.
|
||
|
||
+++
|
||
**** 'fit-frame-to-buffer-margins' and 'fit-frame-to-buffer-sizes'
|
||
handle fitting a frame to its buffer individually.
|
||
|
||
+++
|
||
**** 'drag-internal-border', 'drag-with-header-line',
|
||
'drag-with-mode-line', 'snap-width', 'top-visible' and 'bottom-visible'
|
||
allow dragging and resizing frames with the mouse.
|
||
|
||
+++
|
||
**** 'minibuffer' is now set to the default minibuffer window when
|
||
initially specified as nil and is not reset to nil when initially
|
||
specifying a minibuffer window.
|
||
|
||
*** The new function 'frame-list-z-order' returns a list of all frames
|
||
in Z (stacking) order.
|
||
|
||
+++
|
||
*** The function 'x-focus-frame' optionally tries to not activate its
|
||
frame.
|
||
|
||
+++
|
||
*** The variable 'focus-follows-mouse' has a third meaningful value
|
||
'auto-raise' to indicate that the window manager automatically raises a
|
||
frame when the mouse pointer enters it.
|
||
|
||
+++
|
||
*** The new function 'frame-restack' puts a frame above or below
|
||
another on the display.
|
||
|
||
+++
|
||
*** The new face 'internal-border' specifies the background of a frame's
|
||
internal border.
|
||
|
||
+++
|
||
*** The NORECORD argument of 'select-window' now has a meaningful value
|
||
'mark-for-redisplay' which is like any other non-nil value but marks
|
||
WINDOW for redisplay.
|
||
|
||
+++
|
||
*** Support for side windows is now official. The display action
|
||
function 'display-buffer-in-side-window' will display its buffer in a
|
||
side window. Functions for toggling all side windows on a frame,
|
||
changing and reversing the layout of side windows and returning the
|
||
main (major non-side) window of a frame are provided. For details
|
||
consult the section "(elisp) Side Windows" in the ELisp manual.
|
||
|
||
+++
|
||
*** Support for atomic windows - rectangular compositions of windows
|
||
treated by 'split-window', 'delete-window' and 'delete-other-windows'
|
||
like a single live window - is now official. For details consult the
|
||
section "(elisp) Atomic Windows" in the ELisp manual.
|
||
|
||
+++
|
||
*** New 'display-buffer' alist entry 'window-parameters' allows the
|
||
assignment of window parameters to the window used for displaying the
|
||
buffer.
|
||
|
||
+++
|
||
*** New function 'display-buffer-reuse-mode-window' is an action function
|
||
suitable for use in 'display-buffer-alist'. For example, to avoid
|
||
creating a new window when opening man pages when there's already one,
|
||
use
|
||
|
||
(add-to-list 'display-buffer-alist
|
||
'("\\`\\*Man .*\\*\\'" .
|
||
(display-buffer-reuse-mode-window
|
||
(inhibit-same-window . nil)
|
||
(mode . Man-mode))))
|
||
|
||
+++
|
||
*** New window parameter 'no-delete-other-windows' prevents that
|
||
its window gets deleted by 'delete-other-windows'.
|
||
|
||
+++
|
||
*** New window parameters 'mode-line-format' and 'header-line-format'
|
||
allow the buffer-local formats for this window to be overridden.
|
||
|
||
+++
|
||
*** New command 'window-swap-states' swaps the states of two live
|
||
windows.
|
||
|
||
+++
|
||
*** New functions 'window-pixel-width-before-size-change' and
|
||
'window-pixel-height-before-size-change' support detecting which
|
||
window changed size when 'window-size-change-functions' are run.
|
||
|
||
+++
|
||
*** The new function 'window-lines-pixel-dimensions' returns the pixel
|
||
dimensions of a window's text lines.
|
||
|
||
+++
|
||
*** The new function 'window-largest-empty-rectangle' returns the
|
||
dimensions of the largest rectangular area not occupying any text in a
|
||
window's body.
|
||
|
||
+++
|
||
*** The semantics of 'mouse-autoselect-window' has changed slightly.
|
||
For details see the section "(elisp) Mouse Window Auto-selection" in
|
||
the ELisp manual.
|
||
|
||
---
|
||
*** 'select-frame-by-name' now may return a frame on another display
|
||
if it does not find a suitable one on the current display.
|
||
|
||
---
|
||
** 'tcl-auto-fill-mode' is now declared obsolete. Its functionality
|
||
can be replicated simply by setting 'comment-auto-fill-only-comments'.
|
||
|
||
** New pcase pattern 'rx' to match against an rx-style regular expression.
|
||
For details, see the doc string of 'rx--pcase-macroexpander'.
|
||
|
||
---
|
||
** New functions to set region from secondary selection and vice versa.
|
||
The new functions 'secondary-selection-to-region' and
|
||
'secondary-selection-from-region' let you set the beginning and the
|
||
end of the region from those of the secondary selection and vice
|
||
versa.
|
||
|
||
** New function 'lgstring-remove-glyph' can be used to modify a
|
||
gstring returned by the underlying layout engine (e.g. m17n-flt,
|
||
uniscribe).
|
||
|
||
|
||
* Changes in Emacs 26.1 on Non-Free Operating Systems
|
||
|
||
+++
|
||
** Intercepting hotkeys on Windows 7 and later now works better.
|
||
The new keyboard hooking code properly grabs system hotkeys such as
|
||
'Win-*' and 'Alt-TAB', in a way that Emacs can get at them before the
|
||
system. This makes the 'w32-register-hot-key' functionality work
|
||
again on all versions of MS-Windows starting with Windows 7. On
|
||
Windows NT and later you can now register any hotkey combination. (On
|
||
Windows 9X, the previous limitations, spelled out in the Emacs manual,
|
||
still apply.)
|
||
|
||
---
|
||
** 'convert-standard-filename' no longer mirrors slashes on MS-Windows.
|
||
Previously, on MS-Windows this function converted slash characters in
|
||
file names into backslashes. It no longer does that. If your Lisp
|
||
program used 'convert-standard-filename' to prepare file names to be
|
||
passed to subprocesses (which is not the recommended usage of that
|
||
function), you will now have to mirror slashes in your application
|
||
code. One possible way is this:
|
||
|
||
(let ((start 0))
|
||
(while (string-match "/" file-name start)
|
||
(aset file-name (match-beginning 0) ?\\)
|
||
(setq start (match-end 0))))
|
||
|
||
---
|
||
** GUI sessions on MS-Windows now treat SIGINT like Posix platforms do.
|
||
The effect of delivering a Ctrl-C (SIGINT) signal to a GUI Emacs on
|
||
MS-Windows is now the same as on Posix platforms -- Emacs saves the
|
||
session and exits. In particular, this will happen if you start
|
||
emacs.exe from the Windows shell, then type Ctrl-C into that shell's
|
||
window.
|
||
|
||
---
|
||
** 'signal-process' supports SIGTRAP on Windows XP and later.
|
||
The 'kill' emulation on Windows now maps SIGTRAP to a call to the
|
||
'DebugBreakProcess' API. This causes the receiving process to break
|
||
execution and return control to the debugger. If no debugger is
|
||
attached to the receiving process, the call is typically ignored.
|
||
This is in contrast to the default action on POSIX Systems, where it
|
||
causes the receiving process to terminate with a core dump if no
|
||
debugger has been attached to it.
|
||
|
||
---
|
||
** 'set-mouse-position' and 'set-mouse-absolute-pixel-position' work
|
||
on macOS.
|
||
|
||
---
|
||
** Emacs can now be run as a GUI application from the command line on
|
||
macOS.
|
||
|
||
+++
|
||
** 'ns-appearance' and 'ns-transparent-titlebar' change the appearance
|
||
of frame decorations on macOS 10.9+.
|
||
|
||
---
|
||
** 'ns-use-thin-smoothing' enables thin font smoothing on macOS 10.8+.
|
||
|
||
---
|
||
** 'process-attributes' on Darwin systems now returns more information.
|
||
|
||
---
|
||
** Mousewheel and trackpad scrolling on macOS 10.7+ now behaves more
|
||
like the macOS default. The new variables 'ns-mwheel-line-height',
|
||
'ns-use-mwheel-acceleration' and 'ns-use-mwheel-momentum' can be used
|
||
to customize the behavior.
|
||
|
||
|
||
----------------------------------------------------------------------
|
||
This file is part of GNU Emacs.
|
||
|
||
GNU Emacs is free software: you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation, either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
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.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
|
||
|
||
|
||
Local variables:
|
||
coding: utf-8
|
||
mode: outline
|
||
paragraph-separate: "[ ]*$"
|
||
end:
|