GNU Emacs NEWS -- history of user-visible changes. Copyright (C) 2022-2024 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 31. See file HISTORY for a list of GNU Emacs versions and release dates. See files NEWS.30, NEWS.29, ..., 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 relevant manuals in doc/ have been updated. --- means no change in the manuals is needed. When you add a new item, use the appropriate mark if you are sure it applies, and please also update docstrings as needed. * Installation Changes in Emacs 31.1 ** Changed GCC default options on 32-bit x86 systems. When using GCC 4 or later to build Emacs on 32-bit x86 systems, 'configure' now defaults to using the GCC options '-mfpmath=sse' (if the host system supports SSE2) or '-fno-tree-sra' (if not). These GCC options work around GCC bug 58416, which can cause Emacs to behave incorrectly in rare cases. * Startup Changes in Emacs 31.1 * Changes in Emacs 31.1 --- ** find-func.el commands now have history enabled. The 'find-function', 'find-library', 'find-face-definition', and 'find-variable' commands now allow retrieving previous input using the usual minibuffer history commands. Each command has a separate history. ** Minibuffer and Completions +++ *** New user option 'completion-pcm-leading-wildcard'. This option configures how the partial-completion style does completion. It defaults to nil, which preserves the existing behavior. When it is set to t, the partial-completion style behaves more like the substring style, in that a string being completed can match against a candidate anywhere in the candidate string. +++ *** 'completion-styles' now can contain lists of bindings. In addition to being a symbol naming a completion style, an element of 'completion-styles' can now be a list of the form '(STYLE ((VARIABLE VALUE) ...))' where STYLE is a symbol naming a completion style. VARIABLE will be bound to VALUE (without evaluating it) while the style is executing. This allows multiple references to the same style with different values for completion-affecting variables like 'completion-pcm-leading-wildcard' or 'completion-ignore-case'. This also applies for the styles configuration in 'completion-category-overrides' and 'completion-category-defaults'. ** Windows +++ *** New hook 'window-deletable-functions'. This abnormal hook gives its client a way to save a window from getting deleted implicitly by functions like 'kill-buffer', 'bury-buffer' and 'quit-restore-window'. +++ *** New user option 'kill-buffer-quit-windows'. This option has 'kill-buffer' call 'quit-restore-window' to handle the further destiny of any window showing the buffer to be killed. +++ *** New window parameter 'quit-restore-prev'. This parameter is set up by 'display-buffer' when it detects that the window used already has a 'quit-restore' parameter. Its presence gives 'quit-restore-window' a way to undo a sequence of buffer display operations more intuitively. +++ *** 'quit-restore-window' handles new values for BURY-OR-KILL argument. The values 'killing' and 'burying' are like 'kill' and 'bury' but assume that the actual killing or burying of the buffer is done by the caller. +++ *** New user option 'quit-restore-window-no-switch'. With this option set, 'quit-restore-window' will delete its window more aggressively rather than switching to some other buffer in it. ** Frames +++ *** New function 'frame-deletable-p'. Calling this function before 'delete-frame' is useful to avoid that the latter throws an error when the argument FRAME cannot be deleted. ** Tab Bars and Tab Lines --- *** New abnormal hook 'tab-bar-auto-width-functions'. This hook allows you to control which tab-bar tabs are auto-resized. ** Project --- *** New command 'project-root-find-file'. It is equivalent to running ‘project-any-command’ with ‘find-file’. * Editing Changes in Emacs 31.1 ** Internationalization --- *** Emacs now supports Unicode version 16.0. --- *** New language-environment and input method for Tifinagh. The Tifinagh script is used to write the Berber languages. --- ** 'visual-wrap-prefix-mode' now supports variable-pitch fonts. When using 'visual-wrap-prefix-mode' in buffers with variable-pitch fonts, the wrapped text will now be lined up correctly so that it's exactly below the text after the prefix on the first line. --- ** New commands 'unix-word-rubout' and 'unix-filename-rubout'. Unix-words are words separated by whitespace regardless of the buffer's syntax table. In a Unix terminal or shell, C-w kills by Unix-word. The new commands 'unix-word-rubout' and 'unix-filename-rubout' allow you to bind keys to operate more similarly to the terminal. --- ** New user option 'kill-region-dwim'. This option, if non-nil, modifies the fall-back behavior of 'kill-region' if no region is active, and will kill the last word instead of raising an error. Note that if you have disabled Transient Mark mode you might prefer to use 'unix-word-rubout', as this feature relies on there being an active region. * Changes in Specialized Modes and Packages in Emacs 31.1 ** Whitespace --- *** 'whitespace-cleanup' now adds missing newline at end of file. If 'whitespace-style' includes 'missing-newline-at-eof' (which is the default), the 'whitespace-cleanup' function will now add the newline. ** Gnus --- *** Replying to icalendar events now supports specifying a comment. When called with a prefix argument, accepting, declining, or tentatively accepting an icalendar event will prompt for a comment to add to the response. ** Eshell --- *** New user option 'eshell-command-async-buffer'. This option lets you tell 'eshell-command' how to respond if its output buffer is already in use by another invocation of 'eshell-command', much like 'async-shell-command-buffer' does for 'shell-command'. By default, this will prompt for confirmation before creating a new buffer when necessary. To restore the previous behavior, set this option to 'confirm-kill-process'. +++ *** 'eshell-execute-file' is now an interactive command. Interactively, this now prompts for a script file to execute. With the prefix argument, it will also insert any output into the current buffer at point. +++ *** 'eshell-command' and 'eshell-execute-file' can now set where stderr goes. These functions now take an optional ERROR-TARGET argument to control where to send the standard error output. See the "(eshell) Entry Points" node in the Eshell manual for more details. +++ *** Eshell's built-in 'wait' command now accepts a timeout. By passing '-t' or '--timeout', you can specify a maximum time to wait for the processes to exit. Additionally, you can now wait for external processes by passing their PIDs. ** SHR +++ *** SHR now slices large images into rows. Sliced images allow for more intuitive scrolling up/down by letting you scroll past each slice, instead of jumping past the entire image. Previously, SHR sliced images when zoomed to their original size, no matter how large or small that was. Now, SHR slices any images taller than 'shr-sliced-image-height'. For more information, see the "(eww) Advanced" node in the EWW manual. --- *** You can now customize the image zoom levels to cycle through. By customizing 'shr-image-zoom-levels', you can change the list of zoom levels that SHR cycles through when calling 'shr-zoom-image'. --- *** New user option 'shr-fill-text'. When 'shr-fill-text' is non-nil (the default), SHR will fill text according to the width of the window. If you customize it to nil, SHR will leave the text as-is; in that case, EWW will automatically enable 'visual-line-mode' when displaying a page so that long lines are visually wrapped at word boundaries. ** EWW --- *** EWW now enables 'visual-wrap-prefix-mode' when 'shr-fill-text' is nil. By default, 'shr-fill-text' is t, and EWW fills the text according to the width of the window. If you customize 'shr-fill-text' to nil, EWW will now automatically turn on 'visual-wrap-prefix-mode' in addition to 'visual-line-mode', so that long lines are wrapped at word boundaries near window edge and the continuation lines are indented using prefixes computed from surrounding context. ** Go-ts mode +++ *** New unit test commands. Three new commands are now available to run unit tests. The 'go-ts-mode-test-function-at-point' command runs the unit test at point. If a region is active, it runs all the unit tests under the region. It is bound to 'C-c C-t t' in 'go-ts-mode'. The 'go-ts-mode-test-this-file' command runs all unit tests in the current file. It is bound to 'C-c C-t f' in 'go-ts-mode'. The 'go-ts-mode-test-this-package' command runs all unit tests under the package of the current buffer. It is bound to 'C-c C-t p' in 'go-ts-mode'. The 'go-ts-mode-build-tags' user option is available to set a list of build tags for the test commands. ** Emacs Lisp mode --- *** Checkdoc no longer warns about missing footer lines in some cases. Emacs Lisp libraries have traditionally ended with a footer line (sometimes referred to as "terminating comment"). Their purpose was to easily detect files that had been truncated in transit on ancient and less reliable connections: ;; some-cool-package.el ends here 'checkdoc' will no longer warn if that line is missing for packages that explicitly only support Emacs 30.1 or later, as specified in the "Package-Requires" header. The reason for keeping the warning for packages that support earlier versions of Emacs is that package.el in those versions can't install packages where that line is missing. This change affects both 'M-x checkdoc' and the corresponding flymake backend. --- *** Checkdoc will now flag incorrect formatting in warnings. This affects calls to 'warn', 'lwarn', 'display-warning', and 'message-box'. --- *** The default of 'checkdoc-verb-check-experimental-flag' is now nil. In most cases, having it enabled leads to a large amount of false positives. ** DocView --- *** Dedicated buffer for plain text contents. When switching to the plain text contents with 'doc-view-open-text', DocView now creates a dedicated buffer to display it. 'C-c C-c' gets you back to real DocView buffer if it still exists. ** Tramp +++ *** Connection method "kubernetes" supports now optional namespace. The host name for Kubernetes connections can be of kind [CONTAINER.]POD[%NAMESPACE], in order to specify the namespace to be used. This overrides the setting in 'tramp-kubernetes-namespace', if any. ** Diff --- *** New command 'diff-kill-ring-save'. This command copies to the 'kill-ring' a region of text modified according to diffs in the current buffer, but without applying the diffs to the original text. If the selected range extends a hunk, the command attempts to look up and copy the text in-between the hunks. --- *** New user option 'diff-display-after-apply-hunk'. This option can be customized to nil to inhibit how, by default, 'diff-apply-hunk' displays the changed text after applying the hunk. It can also be let-bound by Lisp code wrapping 'diff-apply-hunk'. +++ *** New command 'diff-discard-hunk' bound to C-c C-k. This command reverse-applies the hunk at point, and then kills it. This is useful in buffers generated C-x v = and C-x v D. ** php-ts-mode --- *** 'php-ts-mode-run-php-webserver' can now accept a custom "php.ini" file. You can use the new optional argument CONFIG when calling 'php-ts-mode-run-php-webserver' to pass an alternative "php.ini" file to the built-in Web server. Interactively, when invoked with a prefix argument, 'php-ts-mode-run-php-webserver' prompts for the config file as well as for other connection parameters. ** Ediff +++ *** Ediff's copy commands now apply to all changes with 'C-u' prefix. The Ediff copy commands, bound to 'a', 'b', 'ab', etc., now copy all changes when supplied with a universal prefix argument via 'C-u': - 'C-u a' copies all changes from buffer A to buffer B (in 2-way diff) or to buffer C (in 3-way diff or merge). - 'C-u b' copies all changes from buffer B to buffer A (in 2-way diff) or to buffer C (in 3-way diff or merge). - 'C-u a b' copies all changes from buffer A to buffer B. - 'C-u b a' copies all changes from buffer B to buffer A. - 'C-u a c' copies all changes from buffer A to buffer C. - 'C-u b c' copies all changes from buffer B to buffer C. - 'C-u c a' copies all changes from buffer C to buffer A. - 'C-u c b' copies all changes from buffer C to buffer B. ** Dired +++ *** New user option 'dired-check-symlinks' allows disabling validity checks. Dired uses 'file-truename' to check symbolic link validity when fontifying them, which can be slow for remote directories. Setting 'dired-check-symlinks' to nil disables these checks. Defaults to t, can be set as a connection-local variable. ** Grep +++ *** Grep results can be edited to reflect changes in the originating file. Like Occur Edit mode, typing 'e' in the '*grep*' buffer will now make the 'grep' results editable. The edits will be reflected in the buffer visiting the originating file. Typing 'C-c C-c' will leave the Grep Edit mode. ** TeX modes +++ *** New xref backend for TeX modes. The new backend ('tex-etags') is on by default, and improves the functionality of the standard 'xref' commands in TeX buffers. You can restore the standard 'etags' backend with the 'M-x xref-etags-mode' toggle. * New Modes and Packages in Emacs 31.1 * Incompatible Lisp Changes in Emacs 31.1 ** The obsolete calling convention of 'error' has been removed. That convention was: '(error &rest ARGS)'. ** The 'rx' category name 'chinese-two-byte' must now be spelled correctly. An old alternative name (without the first 'e') has been removed. --- ** All the digit characters now have the 'digit' category. All the characters whose Unicode general-category is Nd now have the 'digit' category, whose mnemonic is '6'. This includes both ASCII and non-ASCII digit characters. --- ** All the symbol characters now have the 'symbol' category. All the characters that belong to the 'symbol' script (according to 'char-script-table') now have the 'symbol' category, whose mnemonic is '5'. * Lisp Changes in Emacs 31.1 +++ ** Support interactive D-Bus authorization. A new ':authorizable t' parameter has been added to 'dbus-call-method' and 'dbus-call-method-asynchronously' to allow the user to interactively authorize the invoked D-Bus method (for example via polkit). ** The customization group 'wp' has been removed. It has been obsolete since Emacs 26.1. Use the group 'text' instead. ** Tree-sitter changes +++ *** Indirect buffers can have their own parser list. Before, indirect buffers share their base buffer’s parser list and parsers. Now they can have their own parser list. +++ *** New variable 'treesit-language-remap-alist'. This variable allows a user to remap one language into another, such that creating a parser for language A actually creates a parser for language B. By extension, any font-lock rules or indentation rules for language A will be applied to language B instead. This is useful for reusing font-lock rules and indentation rules of language A for language B, when language B is a strict superset of language A. +++ ** New optional BUFFER argument for 'string-pixel-width'. If supplied, 'string-pixel-width' will use any face remappings from BUFFER when computing the string's width. --- ** New macro 'with-work-buffer'. This macro is similar to the already existing macro 'with-temp-buffer', except that it does not allocate a new temporary buffer on each call, but tries to reuse those previously allocated (up to a number defined by the new variable 'work-buffer-limit', which defaults to 10). +++ ** 'date-to-time' now defaults to local time. The function now assumes local time instead of Universal Time when its argument lacks explicit time zone information. This has been the de-facto behavior since Emacs 24 although documentation said otherwise. Also, the fallback on 'timezone-make-date-arpa-standard' has been removed because its supported date styles can be handled by 'parse-time-string'. To restore the previously documented behavior, specify "+0000" or "Z" as the time zone in the argument. --- ** The 'min-width' property is now supported for overlays as well. This 'display' property was previously supported only as text property. Now overlays can also have this property, with the same effect for the text "covered" by the overlay. +++ ** New macro 'cond*'. The new macro 'cond*' is an alternative to 'pcase'. Like 'pcase', it can be used to define several clauses, each one with its own condition; the first clause that matches will cause its body to be evaluated. 'cond*' uses syntax that is different from that of 'pcase', which some users might find less cryptic. See the Info node "(elisp) cond* Macro" for details. * Changes in Emacs 31.1 on Non-Free Operating Systems --- ** Process execution has been optimized on Android. The run-time performance of subprocesses on recent Android releases, where a userspace executable loader is required, has been optimized on systems featuring Linux 3.5.0 and above. --- ** 'NSSpeechRecognitionUsageDescription' now included in "Info.plist" (macOS). Should Emacs (or any built-in shell) invoke a process using macOS speech recognition APIs, the relevant permission dialog is now displayed, thus allowing Emacs users access to speech recognition utilities. Note: Accepting this permission allows the use of system APIs, which may send user data to Apple’s speech recognition servers. --- ** Emacs on MS-Windows now supports GUI dialogs and message boxes better. In particular, it is now possible to show text with embedded newlines in a dialog popped by 'message-box'. This is supported on Windows Vista and later versions. ---------------------------------------------------------------------- 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 . Local variables: coding: utf-8 mode: outline mode: emacs-news paragraph-separate: "[ ]" end: