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* configure.ac: Go back to not defining CHECK_LISP_OBJECT_TYPE by default for developer builds, since it is no longer that useful. We can make it a no-op entirely later, if in practice it's not that helpful to enable it.
230 lines
7.5 KiB
Text
230 lines
7.5 KiB
Text
GNU Emacs NEWS -- history of user-visible changes.
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Copyright (C) 2017 Free Software Foundation, Inc.
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See the end of the file for license conditions.
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Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
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If possible, use M-x report-emacs-bug.
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This file is about changes in Emacs version 27.
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See file HISTORY for a list of GNU Emacs versions and release dates.
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See files NEWS.26, NEWS.25, ..., NEWS.18, and NEWS.1-17 for changes
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in older Emacs versions.
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You can narrow news to a specific version by calling 'view-emacs-news'
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with a prefix argument or by typing C-u C-h C-n.
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Temporary note:
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+++ indicates that all necessary documentation updates are complete.
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(This means all relevant manuals in doc/ AND lisp doc-strings.)
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--- means no change in the manuals is needed.
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When you add a new item, use the appropriate mark if you are sure it applies,
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* Installation Changes in Emacs 27.1
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** The new configure option '--with-json' adds support for JSON using
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the Jansson library. It is on by default; use 'configure
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--with-json=no' to build without Jansson support. The new JSON
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functions 'json-serialize', 'json-insert', 'json-parse-string', and
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'json-parse-buffer' are typically much faster than their Lisp
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counterparts from json.el.
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** Emacs has been ported to the -fcheck-pointer-bounds option of GCC.
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This causes Emacs to check bounds of some arrays addressed by its
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internal pointers, which can be helpful when debugging the Emacs
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interpreter or modules that it uses. If your platform supports it you
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can enable it when configuring, e.g., './configure CFLAGS="-g3 -O2
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-mmpx -fcheck-pointer-bounds"' on Intel MPX platforms.
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** Emacs now normally uses a pointer type instead of an integer type
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for the fundamental word in the Emacs Lisp interpreter, to help
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catch typos and support -fcheck-pointer-bounds. The 'configure'
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option --enable-check-lisp-object-type is therefore no longer as
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useful and so is no longer enabled by default in developer builds,
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to reduce differences between developer and production builds.
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* Startup Changes in Emacs 27.1
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* Changes in Emacs 27.1
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---
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** The new option 'tooltip-resize-echo-area' avoids truncating tooltip text
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on GUI frames when tooltips are displayed in the echo area. Instead,
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it resizes the echo area as needed to accommodate the full tool-tip
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text.
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+++
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** New function 'logcount' calculates an integer's Hamming weight.
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+++
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** New function 'libxml-available-p'.
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This function returns non-nil if libxml support is both compiled in
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and available at run time. Lisp programs should use this function to
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detect built-in libxml support, instead of testing for that
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indirectly, e.g., by checking that functions like
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'libxml-parse-html-region' return nil.
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* Editing Changes in Emacs 27.1
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---
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** New variable 'x-wait-for-event-timeout'.
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This controls how long Emacs will wait for updates to the graphical
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state to take effect (making a frame visible, for example).
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+++
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** The new user option 'electric-quote-replace-double' controls
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whether '"' is also replaced in 'electric-quote-mode'. If non-nil,
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'"' is replaced by a double typographic quote.
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* Changes in Specialized Modes and Packages in Emacs 27.1
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** CSS mode
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---
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*** A new command 'css-cycle-color-format' for cycling between color
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formats (e.g. "black" => "#000000" => "rgb(0, 0, 0)") has been added,
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bound to 'C-c C-f'.
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** Dired
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+++
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*** The new user option 'dired-create-destination-dirs' controls whether
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'dired-do-copy' and 'dired-rename-file' should create non-existent
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directories in the destination.
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** Ibuffer
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---
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*** New filter ibuffer-filter-by-process; bound to '/E'.
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** Edebug
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+++
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*** The runtime behavior of Edebug's instrumentation can be changed
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using the new variables 'edebug-behavior-alist',
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'edebug-after-instrumentation-function' and
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'edebug-new-definition-function'. Edebug's behavior can be changed
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globally or for individual definitions.
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** Enhanced xterm support
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*** New variable 'xterm-set-window-title' controls whether Emacs sets
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the XTerm window title. This feature is experimental and is disabled
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by default.
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** Gamegrid
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** ERT
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+++
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*** New variable 'ert-quiet' allows to make ERT output in batch mode
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less verbose by removing non-essential information.
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---
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*** Gamegrid now determines its default glyph size based on display
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dimensions, instead of always using 16 pixels. As a result, Tetris,
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Snake and Pong are more playable on HiDPI displays.
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** Filecache
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---
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*** Completing filenames in the minibuffer via 'C-TAB' now uses the
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styles as configured by the variable 'completion-styles'.
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** New macros 'thunk-let' and 'thunk-let*'.
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These macros are analogue to 'let' and 'let*', but create bindings that
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are evaluated lazily.
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** Eshell
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---
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*** Expansion of history event designators is disabled by default.
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To restore the old behavior, use
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(add-hook 'eshell-expand-input-functions
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#'eshell-expand-history-references)
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* New Modes and Packages in Emacs 27.1
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+++
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** Emacs can now visit files in archives as if they were directories.
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This feature uses Tramp and works only on systems which support GVFS,
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i.e. GNU/Linux, roughly spoken. See the chapter "(tramp) Archive file
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names" in the Tramp manual for full documentation of these facilities.
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* Incompatible Lisp Changes in Emacs 27.1
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** The FILENAME argument to 'file-name-base' is now mandatory and no
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longer defaults to 'buffer-file-name'.
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---
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** The function 'eldoc-message' now accepts a single argument.
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Programs that called it with multiple arguments before should pass
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them through 'format' first. Even that is discouraged: for ElDoc
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support, you should set 'eldoc-documentation-function' instead of
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calling 'eldoc-message' directly.
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** Old-style backquotes now generate an error. They have been
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generating warnings for a decade.
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* Lisp Changes in Emacs 27.1
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** Internal parsing commands now use syntax-ppss and disregard
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open-paren-in-column-0-is-defun-start. This affects mostly things like
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forward-comment, scan-sexps, and forward-sexp when parsing backward.
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The new variable 'comment-use-syntax-ppss' can be set to nil to recover the old
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behavior if needed.
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---
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** The 'file-system-info' function is now available on all platforms.
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instead of just Microsoft platforms. This fixes a 'get-free-disk-space'
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bug on OS X 10.8 and later (Bug#28639).
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---
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** The function 'get-free-disk-space' returns now a non-nil value for
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remote systems, which support this check.
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+++
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** The function 'make-string' accepts an additional optional argument.
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If the optional third argument is non-nil, 'make-string' will produce
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a multibyte string even if its second argument is an ASCII character.
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** New JSON parsing and serialization functions 'json-serialize',
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'json-insert', 'json-parse-string', and 'json-parse-buffer'. These
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are implemented in C using the Jansson library.
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* Changes in Emacs 27.1 on Non-Free Operating Systems
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----------------------------------------------------------------------
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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Local variables:
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coding: utf-8
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mode: outline
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paragraph-separate: "[ ]*$"
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end:
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