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 30. See file HISTORY for a list of GNU Emacs versions and release dates. See files NEWS.29, NEWS.28, ..., 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 30.1 +++ ** Emacs has been ported to the Android operating system. This requires Emacs to be compiled on another computer. The Android NDK, SDK, and a suitable Java compiler must also be installed. See the file 'java/INSTALL' for more details. --- ** Native compilation is now enabled by default. 'configure' will enable the Emacs Lisp native compiler, so long as libgccjit is present and functional on the system. To disable native compilation, configure Emacs with the option: ./configure --with-native-compilation=no --- ** Emacs now defaults to ossaudio library for sound on NetBSD and OpenBSD. Previously configure used ALSA libraries if installed on the system when configured '--with-sound=yes' (which is the default), with fallback to libossaudio. The libossaudio library included with the base system is now used even if ALSA is found to avoid relying on external packages and to resolve potential incompatibilities between Linux and BSD versions of ALSA. Use '--with-sound=alsa' to build with ALSA on these operating systems instead. --- ** Native JSON support is now always available; libjansson is no longer used. No external library is required. The '--with-json' configure option has been removed. 'json-available-p' now always returns non-nil and is only kept for compatibility. * Startup Changes in Emacs 30.1 ** On GNU/Linux, Emacs is now the default application for 'org-protocol'. Org mode provides a way to quickly capture bookmarks, notes, and links using 'emacsclient': emacsclient "org-protocol://store-link?url=URL&title=TITLE" Previously, users had to manually configure their GNU/Linux desktop environment to open 'org-protocol' links in Emacs. These links should now open in Emacs automatically, as the "emacsclient.desktop" file now arranges for Emacs to be the default application for the 'org-protocol' URI scheme. See the Org mode manual, Info node "(org) Protocols" for more details. * Incompatible Changes in Emacs 30.1 ** Mouse wheel events should now always be 'wheel-up/down/left/right'. At those places where the old 'mouse-4/5/6/7' events could still occur (i.e., X11 input in the absence of XInput2, and 'xterm-mouse-mode'), we remap them to the corresponding 'wheel-up/down/left/right' event, according to the new variable 'mouse-wheel-buttons'. The old variables 'mouse-wheel-up-event', 'mouse-wheel-down-event', 'mouse-wheel-left-event', and 'mouse-wheel-right-event' are thereby obsolete. ** Tree-Sitter modes are now declared as submodes of the non-TS modes. In order to help the use of those Tree-Sitter modes, they are now declared to have the corresponding non-Tree-Sitter mode as an additional parent. This way, things like ".dir-locals.el" settings, and YASnippet collections of snippets automatically apply to the new Tree-Sitter modes. Note that those modes still do not inherit from the non-TS mode, so configuration settings installed via mode hooks are not affected. +++ ** URL now never sends user email addresses in HTTP requests. Emacs never sent email addresses by default, but it used to be possible to customize 'url-privacy-level' so that the users email address was sent along in HTTP requests. This feature has now been removed, as it was considered more dangerous than useful. RFC 9110 (§ 10.1.2) also recommends against it. The user option 'url-personal-mail-address' is now also obsolete. To send an email address in the header of individual HTTP requests, see the variable 'url-request-extra-headers'. +++ ** 'completion-auto-help' now affects 'icomplete-in-buffer'. Previously, 'completion-auto-help' mostly affected only minibuffer completion. Now, if 'completion-auto-help' has the value 'lazy', then Icomplete's in-buffer display of possible completions will only appear after the 'completion-at-point' command has been invoked twice, and if 'completion-auto-help' is nil, then Icomplete's in-buffer display is completely suppressed. Thus, if you use 'icomplete-in-buffer', ensure 'completion-auto-help' is not customized to 'lazy' or nil. +++ ** The "*Completions*" buffer now always accompanies 'icomplete-in-buffer'. Previously, it was not consistent whether the "*Completions*" buffer would appear when using 'icomplete-in-buffer'. Now the "*Completions*" buffer and Icomplete's in-buffer display of possible completions always appear together. If you would prefer to see only Icomplete's in-buffer display, and not the "*Completions*" buffer, you can add this to your init: (advice-add 'completion-at-point :after #'minibuffer-hide-completions) ** The defult process filter was rewritten in native code. The round-trip through the Lisp function 'internal-default-process-filter' is skipped when the process filter is the default one. It's reimplemented in native code, reducing GC churn. To undo the change, set 'read-process-output-fast' to nil. * Changes in Emacs 30.1 ** 'describe-function' now shows the type of the function object. The text used to say things like "car is is a built-in function" whereas it now says "car is a primitive-function" where "primitive-function" is the symbol returned by 'cl-type-of' and you can click on it to get information about that type. ** 'advice-remove' is now an interactive command. When called interactively, 'advice-remove' now prompts for an advised function to the advice to remove. ** Emacs now supports Unicode Standard version 15.1. ** New pre-defined values for 'electric-quote-chars'. The available customization options for 'electric-quote-chars' have been updated with common pairs of quotation characters, including "‘", "’", "“", "”", "«", "»", "‹", "›", "‚", "„", "「", "」", "『", and "』". The default is unchanged. ** Network Security Manager +++ *** The Network Security Manager now warns about 3DES by default. This cypher is no longer recommended owing to a major vulnerability disclosed in 2016, and its small 112 bit key size. Emacs now warns about its use also when 'network-security-level' is set to 'medium' (the default). See 'network-security-protocol-checks'. --- *** The Network Security Manager now warns about <2048 bits in DH key exchange. Emacs used to warn for Diffie-Hellman key exchanges with prime numbers smaller than 1024 bits. Since more servers now support it, this number has been bumped to 2048 bits. ** Help +++ *** New command 'help-find-source'. Switch to a buffer visiting the source of what is being described in "*Help*". It is bound to 'C-h 4 s' globally. *** 'describe-function' shows function inferred type when available. For native compiled Lisp functions 'describe-function' prints (after the signature) the automatically inferred function type as well. --- *** New user option 'describe-bindings-outline-rules'. This user option controls outline visibility in the output buffer of 'describe-bindings' when 'describe-bindings-outline' is non-nil. --- *** 'C-h m' ('describe-mode') uses outlining by default. Set 'describe-mode-outline' to nil to get back the old behavior. ** Outline mode *** New commands to show/hide outlines by regexp. '/ h' ('outline-hide-by-heading-regexp') asks for a regexp and then hides the body lines of all outlines whose heading lines match the regexp. '/ s' ('outline-show-by-heading-regexp') does the same but shows the matched outlines. +++ *** 'outline-minor-mode' is supported in tree-sitter major modes. It can be used in all tree-sitter major modes that set either the variable 'treesit-simple-imenu-settings' or 'treesit-outline-predicate'. ** X selection requests are now handled much faster and asynchronously. This means it should be less necessary to disable the likes of 'select-active-regions' when Emacs is running over a slow network connection. ** Emacs now updates invisible frames that are made visible by a compositor. If an invisible or an iconified frame is shown to the user by the compositing manager, Emacs will now redisplay such a frame even though 'frame-visible-p' returns nil or 'icon' for it. This can happen, for example, as part of preview for iconified frames. --- ** New user option 'menu-bar-close-window'. When non-nil, selecting "Close" from the "File" menu or clicking "Close" in the tool bar will result in the current window being closed, if possible. +++ ** 'write-region-inhibit-fsync' now defaults to t in interactive mode, as it has in batch mode since Emacs 24. +++ ** New user option 'remote-file-name-inhibit-delete-by-moving-to-trash'. When non-nil, this option suppresses moving remote files to the local trash when deleting. Default is nil. --- ** New user option 'remote-file-name-inhibit-auto-save'. If this user option is non-nil, 'auto-save-mode' will not auto-save remote buffers. The default is nil. +++ ** New user option 'remote-file-name-access-timeout'. When a positive number, this option limits the call of 'access-file' for remote files to this number of seconds. Default is nil. +++ ** New user option 'yes-or-no-prompt'. This allows the user to customize the prompt that is appended by 'yes-or-no-p' when asking questions. The default value is "(yes or no) ". --- ** New face 'display-time-date-and-time'. This is used for displaying the time and date components of 'display-time-mode'. --- ** New icon images for general use. Several symbolic icons are added to "etc/images/symbols", including plus, minus, check-mark, star, etc. +++ ** Tool bars can now be placed on the bottom on more systems. The 'tool-bar-position' frame parameter can be set to 'bottom' on all window systems other than Nextstep. +++ ** New global minor mode 'modifier-bar-mode'. When this minor mode is enabled, buttons representing modifier keys are displayed along the tool bar. +++ ** New user option 'tool-bar-always-show-default'. When non-nil, the tool bar at the top of a frame does not show buffer local customization of the tool bar. The default value is nil. +++ ** "d" in the mode line now indicates that the window is dedicated. Windows have always been able to be dedicated to a specific buffer; see 'window-dedicated-p'. Now the mode line indicates the dedicated status of a window, with "d" appearing in the mode line if a window is dedicated and "D" if the window is strongly dedicated. This indicator appears before the buffer name, and after the buffer modification and remote buffer indicators (usually "---" together). +++ ** New command 'toggle-window-dedicated'. This makes it easy to interactively mark a specific window as dedicated, so it won't be reused by 'display-buffer'. This can be useful for complicated window setups. It is bound to 'C-x w d' globally. --- ** New user option 'uniquify-dirname-transform'. This can be used to customize how buffer names are uniquified, by making arbitrary transforms on the buffer's directory name (whose components are used to uniquify buffer names when they clash). You can use this to distinguish between buffers visiting files with the same base name that belong to different projects by using the provided transform function 'project-uniquify-dirname-transform'. ** 'insert-directory-program' is now a user option. On *BSD and macOS systems, this user option now defaults to the "gls" executable, if it exists. This should remove the need to change its value when installing GNU coreutils using something like ports or Homebrew. +++ ** CL Print +++ *** You can expand the "..." truncation everywhere. The code that allowed "..." to be expanded in the "*Backtrace*" buffer should now work anywhere the data is generated by 'cl-print'. +++ *** The 'backtrace-ellipsis' button is replaced by 'cl-print-ellipsis'. +++ *** hash-tables' contents can be expanded via the ellipsis. +++ *** Modes can control the expansion via 'cl-print-expand-ellipsis-function'. +++ *** New setting 'raw' for 'cl-print-compiled'. This setting causes byte-compiled functions to be printed in full by 'prin1'. A button on this output can be activated to disassemble the function. +++ *** There is a new chapter in the CL manual documenting cl-print.el. See the Info node "(cl) Printing". ** Modeline elements can now be right-aligned. Anything following the symbol 'mode-line-format-right-align' in 'mode-line-format' will be right-aligned. Exactly where it is right-aligned to is controlled by the new user option 'mode-line-right-align-edge'. ** Windows +++ *** New action alist entry 'some-window' for 'display-buffer'. It defines which window 'display-buffer-use-some-window' should prefer. For example, when 'display-buffer-base-action' is customized to '(nil . ((some-window . mru)))' then a buffer will be displayed in the same most recently used window from the consecutive calls display-buffer' (on a configuration with more than two windows). +++ *** New action alist entry 'category' for 'display-buffer'. If the caller of 'display-buffer' passes '(category . symbol)' in its 'action' argument, you can match the displayed buffer by adding '(category . symbol)' to the condition part of 'display-buffer-alist' entries. +++ *** New action alist entry 'post-command-select-window' for 'display-buffer'. It specifies whether the window of the displayed buffer should be selected or deselected at the end of executing the current command. --- *** User option 'display-comint-buffer-action' is now obsolete. You can use a '(category . comint)' condition in 'display-buffer-alist' to match buffers displayed by comint-related commands. Another user option 'display-tex-shell-buffer-action' is obsolete too for which you can use '(category . tex-shell)'. +++ *** New variable 'window-restore-killed-buffer-windows'. It specifies how 'set-window-configuration' and 'window-state-put' should proceed with windows whose buffer was killed after the corresponding configuration or state was recorded. *** New variable 'window-point-context-set-function'. It can be used to set a context for window point in all windows by 'window-point-context-set' before calling 'current-window-configuration' and 'window-state-get'. Then later another new variable 'window-point-context-use-function' can be used by 'window-point-context-use' after 'set-window-configuration' and 'window-state-put' to restore positions of window points according to the context stored in a window parameter. +++ *** New functions 'set-window-cursor-type' and 'window-cursor-type'. 'set-window-cursor-type' sets a per-window cursor type, and 'window-cursor-type' queries this setting for a given window. Windows are always created with a 'window-cursor-type' of t, which means to consult the variable 'cursor-type' as before. ** Tab Bars and Tab Lines --- *** New user option 'tab-bar-select-restore-context'. It uses 'window-point-context-set' to save contexts where window points were located before switching away from the tab, and 'window-point-context-use' to restore positions of window points after switching back to that tab. --- *** New user option 'tab-bar-select-restore-windows'. It defines what to do with windows whose buffer was killed since the tab was last selected. By default it displays a placeholder buffer with the name " *Old buffer *" that provides information about the name of the killed buffer that was displayed in that window. --- *** New user option 'tab-bar-tab-name-format-functions'. It can be used to add, remove and reorder functions that change the appearance of every tab on the tab bar. --- *** New hook 'tab-bar-tab-post-select-functions'. --- *** New keymap 'tab-bar-mode-map'. By default it contains a keybinding 'C-TAB' to switch tabs, but only when 'C-TAB' is not bound globally. You can unbind it if it conflicts with 'C-TAB' in other modes. --- *** New keymap 'tab-line-mode-map'. By default it contains keybindings for switching tabs: 'C-x ', 'C-x ', 'C-x C-', 'C-x C-'. You can unbind them if you want to use these keys for the commands 'previous-buffer' and 'next-buffer'. --- *** Default list of tabs is changed to support a fixed order. This means that 'tab-line-tabs-fixed-window-buffers', the new default tabs function, is like the previous 'tab-line-tabs-window-buffers' where both of them show only buffers that were previously displayed in the window. But the difference is that the new function always keeps the original order of buffers on the tab line, even after switching between these buffers. You can drag the tabs and release at a new position to manually reorder the buffers on the tab line. --- *** New user option 'tab-line-tabs-buffer-group-function'. It provides two choices to group tab buffers by major mode and by project name. --- *** Buffers on group tabs are now sorted alphabetically. This will keep the fixed order of tabs, even after switching between them. +++ ** New optional argument for modifying directory-local variables. The commands 'add-dir-local-variable', 'delete-dir-local-variable' and 'copy-file-locals-to-dir-locals' now take an optional prefix argument, to enter the file name you want to modify. ** Emacs Server and Client --- *** 'server-eval-args-left' can be used to pop and eval subsequent args. When '--eval' is passed to emacsclient and Emacs is evaluating each argument, this variable is set to those arguments not yet evaluated. It can be used to 'pop' arguments and process them by the function called in the '--eval' expression, which is useful when those arguments contain arbitrary characters that otherwise might require elaborate and error-prone escaping (to protect them from the shell). +++ ** 'recover-file' can show diffs between auto save file and current file. When answering the prompt with "diff" or "=", it now shows the diffs between the auto save file and the current file. --- ** 'ffap-lax-url' now defaults to nil. Previously, it was set to t but this broke remote file name detection. +++ ** Multi-character key echo now ends with a suggestion to use Help. Customize 'echo-keystrokes-help' to nil to prevent that. +++ ** 'read-passwd' can toggle the visibility of passwords. Use 'TAB' in the minibuffer to show or hide the password. Likewise, there is an icon on the mode-line, which toggles the visibility of the password when clicking with 'mouse-1'. +++ ** Support for styled underline face attributes. These are implemented as new values of the 'style' attribute in a face underline specification, 'double-line', 'dots', and 'dashes', and are available on GUI systems. If your terminal's termcap or terminfo database entry defines the 'Su' or 'Smulx' capability, Emacs will also emit the prescribed escape sequence to render faces with such styles on TTY frames. --- ** Support for underline colors on TTY frames. Colors specified in face underlines will now also be displayed in TTY frames with the previously mentioned capabilities. ** Miscellaneous --- *** New face 'appt-notification' for 'appt-display-mode-line'. It can be used to customize the look of the appointment notification displayed on the mode line when 'appt-display-mode-line' is non-nil. --- *** Emacs now recognizes shebang lines that pass '-S'/'--split-string' to 'env'. When visiting a script that invokes 'env -S INTERPRETER ARGS...' in its shebang line, Emacs will now skip over 'env -S' and deduce the major mode based on the interpreter after 'env -S'. +++ ** New function 'sqlite-execute-batch'. This function lets the user execute multiple SQL statements in one go. It is useful, for example, when a Lisp program needs to evaluate an entire SQL file. ** The default value of 'read-process-output-max' was increased to 65536. * Editing Changes in Emacs 30.1 +++ ** New minor mode 'visual-wrap-prefix-mode'. When enabled, continuation lines displayed for a wrapped long line will receive a 'wrap-prefix' automatically computed from the line's surrounding context, such that continuation lines are indented on display as if they were filled with 'M-q' or similar. Unlike 'M-q', the indentation only happens on display, and doesn't change the buffer text in any way. The global minor mode 'global-visual-wrap-prefix-mode' enables this minor mode in all buffers. (This minor mode is the 'adaptive-wrap' ELPA package renamed and lightly edited for inclusion in Emacs.) +++ ** New user option 'gud-highlight-current-line'. When enabled, Gud will visually emphasize the line being executed upon pauses in the debugee's execution, such as those occasioned by breakpoints being hit. --- ** New global minor mode 'kill-ring-deindent-mode'. When enabled, text being saved to the kill ring will be de-indented by the column number at its start. For example, saving the entire function call within: foo () { long_function_with_several_arguments (argument_1_compute (), argument_2_compute (), argument_3_compute ()); } will save: long_function_with_several_arguments (argument_1_compute (), argument_2_compute (), argument_3_compute ()) to the kill ring, omitting the two columns of extra indentation that would otherwise be present in the second and third lines of the function call. +++ ** Emacs now has better support for touchscreen devices. On systems that understand them (at present X, Android, PGTK, and MS-Windows), many touch screen gestures are now implemented and translated into mouse or gesture events, and support for tapping tool bar buttons and opening menus has been written. Countless packages, such as Dired and Custom have been adjusted to better understand touch screen input. --- ** On X, Emacs now supports input methods which perform "string conversion". This means an input method can now ask Emacs to delete text surrounding point and replace it with something else, as well as query Emacs for surrounding text. If your input method allows you to "undo" mistaken compositions, this will now work as well. --- ** New command 'kill-matching-buffers-no-ask'. This works like 'kill-matching-buffers', but without asking for confirmation. --- ** New user option 'duplicate-region-final-position'. It controls the placement of point and the region after duplicating a region with 'duplicate-dwim'. +++ ** New user option 'mouse-prefer-closest-glyph'. When enabled, clicking or dragging with the mouse will put the point or start the drag in front of the buffer position corresponding to the glyph with the closest X coordinate to the click or start of the drag. In other words, if the mouse pointer is in the right half of a glyph, point will be put after the buffer position corresponding to that glyph, whereas if the mouse pointer is in the left half of a glyph, point will be put in front the buffer position corresponding to that glyph. By default this is disabled. ** Internationalization --- *** Users in CJK locales can control width of some non-CJK characters. Some characters are considered by Unicode as "ambiguous" with respect to their display width: either "full-width" (i.e., taking 2 columns on display) or "narrow" (taking 1 column). The actual width depends on the fonts used for these characters by Emacs or (for text-mode frames) by the terminal emulator. Traditionally, font sets in CJK locales were set up so as to display these characters as full-width, and thus Emacs modified the char-width table in those locales to follow suit. Lately, the tendency is to display these characters as narrow. The new user option 'cjk-ambiguous-chars-are-wide' allows users to control whether Emacs considers these characters as full-width (the default) or narrow (if the variable is customized to the nil value). This setting affects the results of 'string-width' and similar functions in CJK locales. --- *** New input methods for the Urdu, Pashto, and Sindhi languages. These languages are spoken in Pakistan and Afghanistan. --- *** New input method "english-colemak". This input method supports the Colemak keyboard layout. *** Additional 'C-x 8' key translations for "æ" and "Æ". These characters can now be input with 'C-x 8 a e' and 'C-x 8 A E', respectively, in addition to the existing translations 'C-x 8 / e' and 'C-x 8 / E'. *** New 'C-x 8' key translations for "low" quotes "„", and "‚". These can now be entered with 'C-x , "' and 'C-x , ''. *** New German language 'C-x 8' key translations for quotation marks. The characters "„", "“", and "”" can now be entered with 'C-x 8 v', 'C-x 8 b' and 'C-x 8 n'. The single versions "‚", "‘", and "’" can now be entered with 'C-x 8 V', 'C-x 8 B' and 'C-x 8 N'. These characters are used for the official German quoting style. Using them requires activating German language support via 'iso-transl-set-language'. *** "latin-prefix" and "latin-postfix" quotation marks additions. These input methods can now produce single, double and "low" left and right quotation marks: "‘", "’", "“", "”", "„", and "‚" by using "[", "]", and "," for "left", "right", and "low" respectively to modify "'" and """. *** "latin-prefix" and "latin-postfix" guillemets support. These input methods can now produce single guillemets "‹" and "›". For "latin-prefix" use "~~<" and "~~>", for "latin-postfix" use "<~" and ">~". Double guillemets ("«" and "»") were already supported. *** New French language 'C-x 8' key translations for "‹" and "›". These characters can now be entered using 'C-x 8 ~ <' and 'C-x 8 ~ >' respectively, after activating French language support via 'iso-transl-set-language'. Double guillemets were already supported via 'C-x 8 <' and 'C-x 8 >' *** Additional 'C-x 8' key translation for Euro "€" currency symbol. This can now be entered using 'C-x 8 E' in addition to the existing 'C-x 8 * E' translation. * Changes in Specialized Modes and Packages in Emacs 30.1 --- ** Titdic-cnv Most of the variables and functions in the file have been renamed to make sure they all use a 'tit-' namespace prefix. --- ** Trace In batch mode, tracing now sends the trace to stdout. +++ ** Mwheel The 'wheel-up/down/left/right' events are now bound unconditionally, and the 'mouse-wheel-up/down/left/right-event' variables are thus used only to specify the 'mouse-4/5/6/7' events that might still happen to be generated by some old packages (or if 'mouse-wheel-buttons' has been set to nil). ** Xterm Mouse mode This mode now emits 'wheel-up/down/right/left' events instead of 'mouse-4/5/6/7' events for the mouse wheel. It uses the new variable 'mouse-wheel-buttons' to decide which button maps to which wheel event (if any). ** Info --- *** New user option 'Info-url-alist'. This user option associates manual names with URLs. It affects the 'Info-goto-node-web' command. By default, associations for all Emacs-included manuals are set. Further associations can be added for arbitrary Info manuals. *** Emacs can now display Info manuals compressed with 'lzip'. This requires the 'lzip' program to be installed on your system. +++ ** New command 'lldb'. Run the LLDB debugger, analogous to the 'gud-gdb' command. ** GDB MI --- *** Variable order and truncation can now be configured in 'gdb-many-windows'. The new user option 'gdb-locals-table-row-config' allows users to configure the order and max length of various properties in the local variables buffer when using 'gdb-many-windows'. By default, this user option is set to write the properties in the order: name, type and value, where the name and type are truncated to 20 characters, and the value is truncated according to the value of 'gdb-locals-value-limit'. If you want to get back the old behavior, set the user option to the value (setopt gdb-locals-table-row-config `((type . 0) (name . 0) (value . ,gdb-locals-value-limit))) --- *** New user option 'gdb-display-io-buffer'. If this is nil, 'M-x gdb' will neither create nor display a separate buffer for the I/O of the program being debugged, but will instead redirect the program's interaction to the GDB execution buffer. The default is t, to preserve previous behavior. ** Grep *** New user option 'grep-use-headings'. When non-nil, the output of Grep is split into sections, one for each file, instead of having file names prefixed to each line. It is equivalent to the "--heading" option of some tools such as 'git grep' and 'rg'. The headings are displayed using the new 'grep-heading' face. ** Compilation mode --- *** The 'omake' matching rule is now disabled by default. This is because it partly acts by modifying other rules which may occasionally be surprising. It can be re-enabled by adding 'omake' to 'compilation-error-regexp-alist'. *** Lua errors and stack traces are now recognized. Compilation mode now recognizes Lua language errors and stack traces. Every Lua error is recognized as a compilation error, and every Lua stack frame is recognized as a compilation info. ** Project +++ *** New user option 'project-mode-line'. When non-nil, display the name of the current project on the mode line. Clicking 'mouse-1' on the project name pops up the project menu. The default value is nil. *** New user option 'project-file-history-behavior'. Customizing it to 'relativize' makes commands like 'project-find-file' and 'project-find-dir' display previous history entries relative to the current project. *** New user option 'project-key-prompt-style'. The look of the key prompt in the project switcher has been changed slightly. To get the previous one, set this option to 'brackets'. *** 'project-try-vc' tries harder to find the responsible VCS. When 'project-vc-extra-root-markers' is non-nil, and causes a subdirectory project to be detected which is not a VCS root, we now additionally traverse the parent directories until a VCS root is found (if any), so that the ignore rules for that repository are used, and the file listing's performance is still optimized. *** New commands 'project-any-command' and 'project-prefix-or-any-command'. The former is now bound to 'C-x p o' by default. The latter is designed primarily for use as a value of 'project-switch-commands'. If instead of a short menu you prefer to have access to all keys defined inside 'project-prefix-map', as well as global bindings (to run other commands inside the project root), you can add this to your init script: (setopt project-switch-commands #'project-prefix-or-any-command) --- *** New variable 'project-files-relative-names'. If it's non-nil, 'project-files' can return file names relative to the project root. Project backends can use this to improve the performance of their 'project-files' implementation. ** VC --- *** Log-Edit buffers now display a tool bar. This tool bar contains items for committing log entries and editing or generating log entries, among other editing operations. --- *** New user option 'vc-git-shortlog-switches'. This is a string or a list of strings that specifies the Git log switches for shortlogs, such as the one produced by 'C-x v L'. 'vc-git-log-switches' is no longer used for shortlogs. --- *** New value 'no-backend' for user option 'vc-display-status'. With this value only the revision number is displayed on the mode-line. --- *** Obsolete command 'vc-switch-backend' re-added as 'vc-change-backend'. The command was previously obsoleted and unbound in Emacs 28. *** Support for viewing VC change history across renames. When a fileset's VC change history ('C-x v l') ends at a rename, we now print the old name(s) and a button which jumps to their history. Git and Hg are supported. Naturally, 'vc-git-print-log-follow' should be nil for this to work (or '--follow' should not be in 'vc-hg-print-log-switches', in Hg's case). Unlike when the '--follow' switch is used, commands to see the diff of the old revision ('d'), check out an old file version ('f') or annotate it right away ('a'), also work on revisions which precede renames. --- *** 'vc-annotate' now abbreviates the Git revision in the buffer name. When using the Git backend, 'vc-annotate' will use an abbreviated revision identifier in its buffer name. To restore the previous behavior, set 'vc-annotate-use-short-revision' to nil. *** New option 'vc-git-file-name-changes-switches'. It allows tweaking the thresholds for rename and copy detection. ** Diff mode --- *** New user option 'diff-refine-nonmodified'. When this is non-nil, 'diff-refine' will highlight lines that were added or removed in their entirety (as opposed to modified lines, where some parts of the line were modified), using the same faces as for highlighting the words added and removed within modified lines. The default value is nil. +++ *** 'diff-ignore-whitespace-hunk' can now be applied to all hunks. When called with a non-nil prefix argument, 'diff-ignore-whitespace-hunk' now iterates over all the hunks in the current diff, regenerating them without whitespace changes. +++ *** New user option 'diff-ignore-whitespace-switches'. This allows changing which type of whitespace changes are ignored when regenerating hunks with 'diff-ignore-whitespace-hunk'. Defaults to the previously hard-coded "-b". *** New command 'diff-apply-buffer' bound to 'C-c RET a'. It applies the diff in the entire diff buffer and saves all modified file buffers. ** Isearch and Replace *** New command 'replace-regexp-as-diff'. It reads a regexp to search for and a string to replace with, then displays a buffer with replacements as diffs. After reviewing the changes in the output buffer you can apply the replacements as a patch to the current file buffer. There are also new commands 'multi-file-replace-regexp-as-diff' that shows as diffs replacements in a list of specified files, and 'dired-do-replace-regexp-as-diff' that shows as diffs replacements in the marked files in Dired. ** Dired --- *** New user option 'dired-movement-style'. When non-nil, make 'dired-next-line', 'dired-previous-line', 'dired-next-dirline', 'dired-prev-dirline' skip empty lines. It also controls how to move point when encountering a boundary (e.g., if every line is visible, invoking 'dired-next-line' at the last line will move to the first line). The default is nil. *** New user option 'dired-filename-display-length'. It is an integer representing the maximum display length of filenames. The middle part of a filename whose length exceeds the restriction is hidden and an ellipsis is displayed instead. A value of 'window' means using the right edge of window as the display restriction. The default is nil. *** New user option 'shell-command-guess-functions'. It defines how to populate a list of commands available for 'M-!', 'M-&', '!', '&' and the context menu "Open With" based on marked files in Dired. Possible backends are 'dired-guess-default', MIME types, XDG configuration and a universal command such as "open" or "start" that delegates to the OS. *** New command 'dired-do-open'. This command is bound to 'E' (mnemonics "External"). Also it can be used by clicking "Open" in the context menu; it "opens" the marked or clicked on files according to the OS conventions. For example, on systems supporting XDG, this runs 'xdg-open' on the files. *** New variable 'dired-guess-shell-alist-optional'. It contains commands for external viewers and players for various media formats, moved to this list from 'dired-guess-shell-alist-default'. *** The default value of 'dired-omit-size-limit' was increased. After performance improvements to omitting in large directories, the new default value is 300k, up from 100k. This means 'dired-omit-mode' will omit files in directories whose directory listing is up to 300 kilobytes in size. +++ *** 'dired-listing-switches' handles connection-local values if exist. This allows to customize different switches for different remote machines. ** Registers +++ *** New mode of prompting for register names and showing preview. The new user option 'register-use-preview' can be customized to the value t or insist to request a different user interface of prompting for register names and previewing the registers: Emacs will require confirmation for overwriting the value of a register, and will show the preview of registers without delay. You can also customize this new option to disable the preview completely. The default value of 'register-use-preview' preserves the behavior of Emacs 29 and before. See the Info node "(emacs) Registers" for more details about the new UI and its variants. ** Ediff --- *** New user option 'ediff-floating-control-frame'. If non-nil, try making the control frame be floating rather than tiled. Many X tiling window managers make the Ediff control frame a tiled window equal in size to the main Emacs frame, which works poorly. This option is useful to set if you use such a window manager. ** Buffer Selection --- *** New user option 'bs-default-action-list'. You can now configure how to display the "*buffer-selection*" buffer using this new option. (Or set 'display-buffer-alist' directly.) ** Eshell +++ *** You can now run Eshell scripts in batch mode. By adding the following interpreter directive to an Eshell script, you can make it executable like other shell scripts: #!/usr/bin/env -S emacs --batch -f eshell-batch-file +++ *** New builtin Eshell command 'compile'. This command runs another command, sending its output to a compilation buffer when the command would output interactively. This can be useful when defining aliases so that they produce a compilation buffer when appropriate, but still allow piping the output elsewhere if desired. For more information, see the "(eshell) Built-ins" node in the Eshell manual. +++ *** Eshell's 'env' command now supports running commands. Like in many other shells, Eshell's 'env' command now lets you run a command passed as arguments to 'env'. If you pass any initial arguments of the form 'VAR=VALUE', 'env' will first set 'VAR' to 'VALUE' before running the command. --- *** Eshell's 'umask' command now supports setting the mask symbolically. Now, you can pass an argument like "u+w,o-r" to Eshell's 'umask' command, which will give write permission for owners of newly-created files and deny read permission for users who are not members of the file's group. See the Info node "(coreutils) File permissions" for more information on this notation. --- *** Performance improvements for interactive output in Eshell. Interactive output in Eshell should now be significantly faster, especially for built-in commands that can print large amounts of output (e.g. "cat"). In addition, these commands can now update the display periodically to show their progress. +++ *** New special reference type '#'. This special reference type returns a marker at 'POSITION' in 'BUFFER'. You can insert it by typing or using the new interactive command 'eshell-insert-marker'. You can also insert special references of any type using the new interactive command 'eshell-insert-special-reference'. See the "(eshell) Arguments" node in the Eshell manual for more details. +++ *** New splice operator for Eshell dollar expansions. Dollar expansions in Eshell now let you splice the elements of the expansion in-place using '$@expr'. This makes it easier to fill lists of arguments into a command, such as when defining aliases. For more information, see the "(eshell) Dollars Expansion" node in the Eshell manual. +++ *** You can now splice Eshell globs in-place into argument lists. By setting 'eshell-glob-splice-results' to a non-nil value, Eshell will expand glob results in-place as if you had typed each matching file name individually. For more information, see the "(eshell) Globbing" node in the Eshell manual. +++ *** Eshell now supports negative numbers and ranges for indices. Now, you can retrieve the last element of a list with '$my-list[-1]' or get a sublist of elements 2 through 4 with '$my-list[2..5]'. For more information, see the "(eshell) Dollars Expansion" node in the Eshell manual. +++ *** Eshell commands can now be explicitly-remote (or local). By prefixing a command name in Eshell with a remote identifier, like "/ssh:user@remote:whoami", you can now run commands on a particular host no matter your current directory. Likewise, you can run a command on your local system no matter your current directory via "/local:whoami". For more information, see the "(eshell) Remote Access" node in the Eshell manual. +++ *** Eshell's '$UID' and '$GID' variables are now connection-aware. Now, when expanding '$UID' or '$GID' in a remote directory, the value is the user or group ID associated with the remote connection. --- *** Eshell now uses 'field' properties in its output. In particular, this means that pressing the '' key moves the point to the beginning of your input, not the beginning of the whole line. If you want to go back to the old behavior, add something like this to your configuration: (keymap-set eshell-mode-map "" #'eshell-bol-ignoring-prompt) This also means you no longer need to adjust 'eshell-prompt-regexp' when customizing your Eshell prompt. --- *** You can now properly unload Eshell. Calling '(unload-feature 'eshell)' no longer signals an error, and now correctly unloads Eshell and all of its modules. +++ *** 'eshell-read-aliases-list' is now an interactive command. After manually editing 'eshell-aliases-file', you can use this command to load the edited aliases. +++ *** 'rgrep' is now a builtin command. Running 'rgrep' in Eshell now uses the Emacs grep facility instead of calling external rgrep. +++ *** If a command exits abnormally, the Eshell prompt now shows its exit code. +++ *** New user option 'eshell-history-append'. If non-nil, each Eshell session will save history by appending new entries of that session to the history file rather than overwriting the file with the whole history of the session. The default is nil. ** Minibuffer and Completions *** New commands 'previous-line-completion' and 'next-line-completion'. Bound to '' and '' arrow keys, respectively, they navigate the "*Completions*" buffer vertically by lines, wrapping at the top/bottom when 'completion-auto-wrap' is non-nil. *** New user option 'minibuffer-visible-completions'. When customized to non-nil, you can use arrow keys in the minibuffer to navigate the completions displayed in the "*Completions*" window. Typing 'RET' selects the highlighted candidate. 'C-g' hides the completions window. When the completions window is not visible, then all these keys have their usual meaning in the minibuffer. This option is supported for in-buffer completion as well. *** Selected completion candidates are deselected on typing. When you type at the minibuffer prompt, the current completion candidate will be un-highlighted, and point in the "*Completions*" window will be moved off that candidate. 'minibuffer-choose-completion' ('M-RET') will still choose a previously-selected completion candidate, but the new command 'minibuffer-choose-completion-or-exit' (bound to 'RET' by 'minibuffer-visible-completions') will exit with the minibuffer contents instead. This deselection behavior can be controlled with the new user option 'completion-auto-deselect', which is t by default. *** New value 'historical' for user option 'completions-sort'. When 'completions-sort' is set to 'historical', completion candidates will be first sorted alphabetically, and then re-sorted by their order in the minibuffer history, with more recent candidates appearing first. +++ *** 'completion-category-overrides' supports more metadata. The new supported completion properties are 'cycle-sort-function', 'display-sort-function', 'annotation-function', 'affixation-function', and 'group-function'. You can now customize them for any category in 'completion-category-overrides' that will override the properties defined in completion metadata. +++ *** 'completion-extra-properties' supports more metadata. The new supported completion properties are 'category', 'group-function', 'display-sort-function', and 'cycle-sort-function'. ** Pcomplete --- *** New user option 'pcomplete-remote-file-ignore'. When this option is non-nil, remote file names are not completed by Pcomplete. Packages, like 'shell-mode', could set this in order to suppress remote file name completion at all. --- *** Completion for the 'doas' command has been added. Command completion for 'doas' in Eshell and Shell mode will now work. ** Shell mode +++ *** New user option 'shell-get-old-input-include-continuation-lines'. When this user option is non-nil, 'shell-get-old-input' ('C-RET') includes multiple shell "\" continuation lines from command output. Default is nil. +++ *** New user option 'shell-history-file-name'. When this user option is set to t, 'shell-mode' does not read the shell history file. Setting this user option to a string specifies the name of the shell history file to be read. A nil value triggers reading the environment variable 'HISTFILE'. In a 'shell' buffer, this user option is connection-local. ** Make mode *** The Makefile browser is now obsolete. The command 'makefile-switch-to-browser' command is now obsolete, together with related commands used in the "*Macros and Targets*" buffer. We recommend using an alternative like 'imenu' instead. ** Prog mode +++ *** New command 'prog-fill-reindent-defun'. This command either fills a single paragraph in a defun, such as a docstring, or a comment, or (re)indents the surrounding defun if point is not in a comment or a string. It is by default bound to 'M-q' in 'prog-mode' and all its descendants. ** Imenu +++ *** New user option 'imenu-flatten'. It controls whether to flatten the list of sections in an imenu, and how to display the sections in the flattened list. +++ *** The sort order of Imenu completions can now be customized. You can customize the option 'completion-category-overrides' and set 'display-sort-function' for the category 'imenu'. ** Which Function mode +++ *** Which Function mode can now display function names on the header line. The new user option 'which-func-display' allows choosing where the function name is displayed. The default is 'mode' to display in the mode line. 'header' will display in the header line; 'mode-and-header' displays in both the header line and mode line. +++ *** New user option 'which-func-update-delay'. This replaces the user option 'idle-update-delay', which was previously used to control the delay before 'which-function-mode' updated its display. The user option 'idle-update-delay', which was only used by Which Function mode, is now obsolete. ** Tramp +++ *** Tramp methods can be optional. An optional connection method is not enabled by default. The user must enable it explicitly by the 'tramp-enable-method' command. The existing methods "fcp", "krlogin", " ksu" and "nc" are optional now. +++ *** New optional connection method "androidsu". This provides access to system files with elevated privileges granted by the idiosyncratic 'su' implementations and system utilities customary on Android. +++ *** New optional connection method "run0". This connection method is similar to "sudo", but it uses the 'systemd-run' program internally. +++ *** New connection methods "dockercp" and "podmancp". These are the external methods counterparts of "docker" and "podman". +++ *** New optional connection methods for containers. There are new optional connection methods "toolbox", "distrobox", "flatpak", "apptainer" and "nspawn". They allow accessing system containers provided by Toolbox or Distrobox, sandboxes provided by Flatpak, instances managed by Apptainer, or accessing systemd-based light-weight containers.. +++ *** Connection method "kubernetes" supports now optional container name. The host name for Kubernetes connections can be of kind [CONTAINER.]POD, in order to specify a dedicated container. If there is just the pod name, the first container in the pod is taken. The new user options 'tramp-kubernetes-context' and 'tramp-kubernetes-namespace' allow accessing pods with different context or namespace but the default one. +++ *** Rename 'tramp-use-ssh-controlmaster-options' to 'tramp-use-connection-share'. The old name still exists as obsolete variable alias. This user option controls now connection sharing for both ssh-based and plink-based methods. It allows the values t, nil, and 'suppress'. The latter suppresses also "ControlMaster" settings in the user's "~/.ssh/config" file, or connection share configuration in PuTTY sessions, respectively. +++ *** New command 'tramp-cleanup-some-buffers'. It kills only a subset of opened remote buffers, subject to the user option 'tramp-cleanup-some-buffers-hook'. +++ *** New command 'inhibit-remote-files'. This command disables the handling of file names with the special remote file name syntax. It should be applied only when remote files won't be used in this Emacs instance. It provides a slightly improved performance of file name handling in Emacs. +++ *** New macro 'without-remote-files'. This macro could wrap code which handles local files only. Due to the temporary deactivation of remote files, it results in a slightly improved performance of file name handling in Emacs. +++ *** New user option 'tramp-completion-multi-hop-methods'. It contains a list of connection methods for which completion should be attempted at the end of a multi-hop chain. This allows completion candidates to include a list of, for example, containers running on a remote docker host. +++ *** New command 'tramp-revert-buffer-with-sudo'. It reverts the current buffer to visit with "sudo" permissions. The buffer must either visit a file, or it must run 'dired-mode'. Another method but "sudo" can be configured with user option 'tramp-file-name-with-method'. +++ *** Direct asynchronous processes are indicated by a connection-local variable. If direct asynchronous processes shall be used, set the connection-local variable 'tramp-direct-async-process' to a non-nil value. This has been changed, in previous Emacs versions this was indicated by the now deprecated connection property "direct-async-process". See the Tramp manual "(tramp) Improving performance of asynchronous remote processes". --- *** Direct asynchronous processes use 'tramp-remote-path'. When a direct asynchronous process is invoked, it uses 'tramp-remote-path' for setting the remote 'PATH' environment variable. ** File Notifications +++ *** All backends except w32notify detect unmounting of a watched filesystem now. ** EWW --- *** New mouse bindings in EWW buffers. Certain form elements that were displayed as buttons, yet could only be activated by keyboard input, are now operable using 'mouse-2'. With "Submit" buttons, this triggers submission of the form, while clicks on other classes of buttons either toggle their values or prompt for user input, as the case may be. --- *** EWW text input fields and areas are now fields. In consequence, movement commands and OS input method features now recognize and confine their activities to the text input field around point. See also the Info node "(elisp) Fields". +++ *** 'eww-open-file' can now display the file in a new buffer. By default, the command reuses the "*eww*" buffer, but if called with the new argument NEW-BUFFER non-nil, it will use a new buffer instead. Interactively, invoke 'eww-open-file' with a prefix argument to activate this behavior. --- *** 'eww' URL or keyword prompt now has tab completion. The interactive minibuffer prompt when invoking 'eww' now has support for tab completion. +++ *** 'eww' URL and keyword prompt now completes suggested URIs and bookmarks. The interactive minibuffer prompt when invoking 'eww' now provides completions from 'eww-suggest-uris'. 'eww-suggest-uris' now includes bookmark URIs. +++ *** New command 'eww-copy-alternate-url'. It copies an alternate link on the page currently visited in EWW into the kill ring. Alternate links are optional metadata that HTML pages use for linking to their alternative representations, such as translated versions or associated RSS feeds. +++ *** 'eww-open-in-new-buffer' supports the prefix argument. When invoked with the prefix argument ('C-u'), 'eww-open-in-new-buffer' will not make the new buffer the current one. This is useful for continuing reading the URL in the current buffer when the new URL is fetched. --- *** History navigation in EWW now behaves as in other browsers. Previously, when navigating back and forward through page history, EWW would add a duplicate entry to the end of the history list each time. This made it impossible to navigate to the "end" of the history list. Now, navigating through history in EWW simply changes your position in the history list, allowing you to reach the end as expected. In addition, when browsing to a new page from a "historical" one (i.e., a page loaded by navigating back through history), EWW deletes the history entries newer than the current page. To change the behavior when browsing from "historical" pages, you can customize 'eww-before-browse-history-function'. +++ *** 'eww-readable' now toggles display of the readable parts of a web page. When called interactively, 'eww-readable' toggles whether to display only the readable parts of a page or the full page. With a positive prefix argument, it always displays the readable parts, and with a zero or negative prefix, it always displays the full page. +++ *** New option 'eww-readable-urls'. This is a list of regular expressions matching the URLs where EWW should display only the readable parts by default. For more details, see "(eww) Basics" in the EWW manual. --- *** New option 'eww-readable-adds-to-history'. When non-nil (the default), calling 'eww-readable' adds a new entry to the EWW page history. ** Go-ts mode +++ *** New command 'go-ts-mode-docstring'. This command adds a docstring comment to the current defun. If a comment already exists, point is only moved to the comment. It is bound to 'C-c C-d' in 'go-ts-mode'. ** Man mode +++ *** New user option 'Man-prefer-synchronous-call'. When this is non-nil, run the 'man' command synchronously rather than asynchronously (which is the default behavior). +++ *** New user option 'Man-support-remote-systems'. This option controls whether the man page is formatted on the remote system when the current buffer's default-directory is remote. You can invoke the 'man' command with a prefix argument to countermand the value of this option for the current invocation of 'man'. ** DocView --- *** New face 'doc-view-svg-face'. This replaces 'doc-view-svg-foreground' and 'doc-view-svg-background'. If you don't like the colors produced by the default definition of this new face when DocView displays documents, customize this face to restore the colors you were used to, or to get colors more to your liking. --- *** DocView buffers now display a new tool bar. This tool bar contains options for searching and navigating within the document, replacing the incompatible items for incremental search and editing within the default tool bar displayed in the past. ** Shortdoc +++ *** New function 'shortdoc-function-examples'. This function returns examples of use of a given Emacs Lisp function from the available shortdoc information. +++ *** New function 'shortdoc-help-fns-examples-function'. This function inserts into the current buffer examples of use of a given Emacs Lisp function, which it gleans from the shortdoc information. If you want 'describe-function' ('C-h f') to insert examples of using the function into regular "*Help*" buffers, add the following to your init file: (add-hook 'help-fns-describe-function-functions #'shortdoc-help-fns-examples-function) ** Package --- *** New user option 'package-vc-register-as-project'. When non-nil, it will automatically register every package as a project, that you can quickly select using 'project-switch-project' ('C-x p p'). --- *** New user option 'package-vc-allow-build-commands'. Controls for which packages Emacs runs extra build commands when installing directly from the package VCS repository. --- *** New command 'package-vc-log-incoming'. This commands displays incoming changes for a VC package without modifying the current checkout. --- *** New command to start an inferior Emacs loading only specific packages. The new command 'package-isolate' will start a new Emacs process, as a sub-process of Emacs where you invoke the command, in a way that causes the new process to load only some of the installed packages. The command prompts for the packages to activate in this sub-process, and is intended for testing Emacs and/or the packages in a clean environment. ** Flymake +++ *** New user option 'flymake-indicator-type'. This user option controls which error indicator type Flymake should use in current buffer. Depending on your preference, this can either use fringes or margins for indicating errors. +++ *** New user option 'flymake-margin-indicators-string'. It controls, for each error type, the string and its face to display as the margin indicator. +++ *** New user option 'flymake-autoresize-margins'. If non-nil, Flymake will resize the margins when 'flymake-mode' is turned on or off. Only relevant if 'flymake-indicator-type' is set to 'margins'. +++ *** New user option 'flymake-margin-indicator-position'. It controls which margin (left or right) is used for margin indicators. +++ *** New user option 'flymake-show-diagnostics-at-end-of-line'. When non-nil, Flymake shows summarized descriptions of diagnostics at the end of the line. Depending on your preference, this can either be distracting and easily confused with actual code, or a significant early aid that relieves you from moving the buffer or reaching for the mouse to consult an error message. ** Flyspell *** New user option 'flyspell-check-changes'. When non-nil, Flyspell mode spell-checks only words that you edited; it does not check unedited words just because you move point across them. ** JS mode. The binding 'M-.' has been removed from the major mode keymaps in 'js-mode' and 'js-ts-mode', having it default to the global binding which calls 'xref-find-definitions'. If the previous one worked better for you, use 'define-key' in your init script to bind 'js-find-symbol' to that combination again. ** Json mode. 'js-json-mode' does not derive from 'js-mode' any more so as not to confuse tools like Eglot or YASnippet into thinking that those buffers contain Javascript code. ** Python mode --- *** New user option 'python-indent-block-paren-deeper'. If non-nil, increase the indentation of the lines inside parens in a header of a block when they are indented to the same level as the body of the block: if (some_expression and another_expression): do_something() instead of: if (some_expression and another_expression): do_something() *** New user option 'python-interpreter-args'. This allows the user to specify command line arguments to the non interactive Python interpreter specified by 'python-interpreter'. *** New function 'python-shell-send-block'. It sends the python block delimited by 'python-nav-beginning-of-block' and 'python-nav-end-of-block' to the inferior Python process. ** Inferior Python mode --- *** Default value of 'python-shell-compilation-regexp-alist' is changed. Support for Python's ExceptionGroup has been added, so in the Python shell, the line indicating the source of error in the error messages from ExceptionGroup will be recognized as well. ** Scheme mode Scheme mode now handles regular expression literal '#/regexp/' that is available in some Scheme implementations. Also, it should now handle nested sexp-comments. ** Use package +++ *** New ':vc' keyword. This keyword enables the user to install packages using 'package-vc'. +++ *** New user option 'use-package-vc-prefer-newest'. This allows the user to always install the newest commit of a package when using the ':vc' keyword. ** Gnus +++ *** New backend 'nnfeed'. This allows backend developers to easily create new backends for web feeds, as inheriting backends of 'nnfeed'. +++ *** New backend 'nnatom'. This allow users to add Atom Syndication Format feeds to Gnus as servers. *** The 'nnweb-type' option 'gmane' has been removed. The gmane.org website is, sadly, down since a number of years with no prospect of it coming back. Therefore, it is no longer valid to set the user option 'nnweb-type' to 'gmane'. --- *** New user option 'gnus-mode-line-logo'. This allows the user to either disable the display of any logo or specify which logo will be displayed as part of the buffer-identification in the mode-line of Gnus buffers. ** Rmail --- *** New commands for reading mailing lists. The new Rmail commands 'rmail-mailing-list-post', 'rmail-mailing-list-unsubscribe', 'rmail-mailing-list-help', and 'rmail-mailing-list-archive' allow, respectively, posting to, unsubscribing from, requesting help about, and browsing the archives of, the mailing list from which the current email message was delivered. ** Dictionary --- *** New user option 'dictionary-search-interface'. Controls how the 'dictionary-search' command prompts for and displays dictionary definitions. Customize this user option to 'help' to have 'dictionary-search' display definitions in a "*Help*" buffer and provide dictionary-based minibuffer completion for word selection. --- *** New user option 'dictionary-read-word-prompt'. This allows the user to customize the prompt that is used by 'dictionary-search' when asking for a word to search in the dictionary. --- *** New user option 'dictionary-display-definition-function'. This allows the user to customize the way in which 'dictionary-search' displays word definitions. If non-nil, this user option should be set to a function that displays a word definition obtained from a dictionary server. The new function 'dictionary-display-definition-in-help-buffer' can be used to display the definition in a "*Help*" buffer, instead of the default "*Dictionary*" buffer. --- *** New user option 'dictionary-read-word-function'. This allows the user to customize the way in which 'dictionary-search' prompts for a word to search in the dictionary. This user option should be set to a function that lets the user select a word and returns it as a string. The new function 'dictionary-completing-read-word' can be used to prompt with completion based on dictionary matches. --- *** New user option 'dictionary-read-dictionary-function'. This allows the user to customize the way in which 'dictionary-search' prompts for a dictionary to search in. This user option should be set to a function that lets the user select a dictionary and returns its name as a string. The new function 'dictionary-completing-read-dictionary' can be used to prompt with completion based on dictionaries that the server supports. --- *** The default value of 'dictionary-tooltip-dictionary' has changed. The new default value is t, which means use the same dictionary as the value of 'dictionary-default-dictionary'. The previous default value was nil, which effectively disabled 'dictionary-tooltip-mode', even if the mode was turned on. ** Pp *** New 'pp-default-function' user option replaces 'pp-use-max-width'. *** New default pretty printing function, which tries to obey 'fill-column'. *** 'pp-to-string' takes an additional PP-FUNCTION argument. This argument specifies the prettifying algorithm to use. ** Emacs Lisp mode --- *** ',@' now has 'prefix' syntax. Previously, the '@' character, which normally has 'symbol' syntax, would combine with a following Lisp symbol and interfere with symbol searching. --- *** 'emacs-lisp-docstring-fill-column' now defaults to 72. It was previously 65. The new default formats documentation strings to fit on fewer lines without negatively impacting readability. ** CPerl mode --- *** Subroutine signatures are now supported. CPerl mode fontifies subroutine signatures like variable declarations which makes them visually distinct from subroutine prototypes. *** Syntax of Perl up to version 5.38 is supported. CPerl mode supports the new keywords for exception handling and the object oriented syntax which were added in Perl 5.36 and 5.38. *** New user option 'cperl-fontify-trailer'. This user option takes the values 'perl-code' or 'comment' and treats text after an "__END__" or "__DATA__" token accordingly. The default value of 'perl-code' is useful for trailing POD and for AutoSplit modules, the value 'comment' makes CPerl mode treat trailers as comment, like Perl mode does. *** New command 'cperl-file-style'. This command sets the indentation style for the current buffer. To change the default style, either use the user option with the same name or use the command 'cperl-set-style'. *** Commands using the Perl info page are obsolete. The Perl documentation in info format is no longer distributed with Perl or on CPAN since more than 10 years. Perl documentation can be read with 'cperl-perldoc' instead. *** Highlighting trailing whitespace has been removed. The user option 'cperl-invalid-face' is now obsolete, and does nothing. See the user option 'show-trailing-whitespace' instead. ** Emacs Sessions (Desktop) +++ *** Restoring buffers visiting remote files can now time out. When a buffer is restored which visits a remote file, the restoration of the session could hang if the remote host is off-line or slow to respond. Setting the user option 'remote-file-name-access-timeout' to a positive number will abandon the attempt to restore such buffers after a timeout of that many seconds, thus allowing the rest of desktop restoration to continue. ** Recentf +++ *** Checking recent remote files can now time out. Similarly to buffer restoration by Desktop, 'recentf-mode' checking of the accessibility of remote files can now time out if 'remote-file-name-access-timeout' is set to a positive number. ** Notifications +++ *** Allow using Icon Naming Specification for ':app-icon'. You can use a symbol as the value for ':app-icon' to provide icon name without specifying a file, like this: (notifications-notify :title "I am playing music" :app-icon 'multimedia-player) ** Image +++ *** Image ':map' property is now recomputed when image is transformed. Now images with clickable maps work as expected after you run commands such as 'image-increase-size', 'image-decrease-size', 'image-rotate', 'image-flip-horizontally', and 'image-flip-vertically'. +++ *** New user option 'image-recompute-map-p'. Set this option to nil to prevent Emacs from recomputing image maps. ** Image Dired *** New user option 'image-dired-thumb-naming'. You can now configure how a thumbnail is named using this option. ** ERT +++ *** New macro 'skip-when' to skip 'ert-deftest' tests. This can help avoid some awkward skip conditions. For example '(skip-unless (not noninteractive))' can be changed to the easier to read '(skip-when noninteractive)'. +++ *** Syntax highlighting unit testing support. An ERT extension ('ert-font-lock') now provides support for face assignment unit testing. For more information, see the "(ert) Syntax Highlighting Tests" node in the ERT manual. ** URL +++ *** 'url-gateway-broken-resolution' is now obsolete. This option was intended for use on SunOS 4.x and Ultrix systems, neither of which have been supported by Emacs since version 23.1. The user option 'url-gateway-nslookup-program' and the function 'url-gateway-nslookup-host' are consequently also obsolete. ** Socks +++ *** Socks supports version 4a. The 'socks-server' user option accepts '4a' as a value for its version field. ** Edmacro +++ *** New command 'edmacro-set-macro-to-region-lines'. Bound to 'C-c C-r', this command replaces the macro text with the lines of the region. If needed, the region is extended to include whole lines. If the region ends at the beginning of a line, that last line is excluded. +++ *** New user option 'edmacro-reverse-macro-lines'. When this is non-nil, the lines of key sequences are displayed with the most recent line first. This is can be useful when working with macros with many lines, such as from 'kmacro-edit-lossage'. ** Proced --- *** More control on automatic update of Proced buffers. The user option 'proced-auto-update-flag' can now be set to 2 additional values, which control automatic updates of Proced buffers that are not displayed in some window. ** Kmacro +++ *** New Advanced Macro Counter functions. New commands have been added to implement advanced macro counter functions. The commands 'C-x C-k C-r l' and 'C-x C-k C-r s' load and save the macro counter from and to a number register, respectively. The commands 'C-x C-k C-r a =', 'C-x C-k C-r a <', and 'C-x C-k C-r a >' compare the macro counter with the contents of a number register and increment the counter by an optional prefix if the comparison succeeds. The commands 'C-x C-k C-q =', 'C-x C-k C-q <', and 'C-x C-k C-q >' compare the macro counter with an optional prefix and terminate the macro if the comparison succeeds. ** Kmacro Menu mode +++ *** New mode 'kmacro-menu-mode' and new command 'list-keyboard-macros'. The new command 'list-keyboard-macros' is the keyboard-macro version of commands like 'list-buffers' and 'list-processes', creating a listing of the currently existing keyboards macros using the new mode 'kmacro-menu-mode'. It allows rearranging the macros in the ring, duplicating them, deleting them, and editing their counters, formats, and keys. ** Customize +++ *** New command 'customize-dirlocals'. This command pops up a buffer to edit the settings in ".dir-locals.el". --- ** New command 'customize-toggle-option'. This command can toggle boolean options for the duration of a session. ** Calc +++ *** Calc parses fractions written using U+2044 FRACTION SLASH. Fractions of the form "123⁄456" are handled as if written "123:456". Note in particular the difference in behavior from U+2215 DIVISION SLASH and U+002F SOLIDUS, which result in division rather than a rational fraction. You may also be interested to know that precomposed fraction characters, such as ½ (U+00BD VULGAR FRACTION ONE HALF), are also recognized as rational fractions. They have been since 2004, but it looks like it was never mentioned in the NEWS, or even the manual. ** IELM --- *** IELM now remembers input history between sessions. The new user option 'ielm-history-file-name' is the name of the file where IELM input history will be saved. Customize it to nil to revert to the old behavior of not remembering input history between sessions. ** EasyPG +++ *** New user option 'epa-keys-select-method'. This allows the user to customize the key selection method, which can be either by using a pop-up buffer or from the minibuffer. The pop-up buffer method is the default, which preserves previous behavior. ** Xwidget Webkit +++ *** New user option 'xwidget-webkit-disable-javascript'. This allows disabling JavaScript in xwidget Webkit sessions. ** Ls Lisp --- *** 'ls-lisp--insert-directory' supports more long options of 'ls'. 'ls-lisp--insert-directory', the ls-lisp implementation of 'insert-directory', now supports the '--time=TIME' and '--sort=time' options of GNU 'ls'. ** Widget +++ *** New user option 'widget-skip-inactive'. If non-nil, moving point forward or backward between widgets by typing 'TAB' or 'S-TAB' skips over inactive widgets. The default value is nil. ** Ruby mode *** New user option 'ruby-rubocop-use-bundler'. By default it retains the previous behavior: read the contents of Gemfile and act accordingly. But you can also set it to t or nil to skip the check. ** Thingatpt --- *** New variables for providing custom thingatpt implementations. The new variables 'bounds-of-thing-at-point-provider-alist' and 'forward-thing-provider-alist' now allow defining custom implementations of 'bounds-of-thing-at-point' and 'forward-thing', respectively. --- *** New helper functions for text property-based thingatpt providers. The new helper functions 'thing-at-point-for-char-property', 'bounds-of-thing-at-point-for-char-property', and 'forward-thing-for-char-property' can help to help implement custom thingatpt providers for "things" that are defined by a text property. --- *** 'bug-reference-mode' now supports 'thing-at-point'. Now, calling '(thing-at-point 'url)' when point is on a bug reference will return the URL for that bug. ** Miscellaneous --- *** Webjump now assumes URIs are HTTPS instead of HTTP. For links in 'webjump-sites' without an explicit URI scheme, it was previously assumed that they should be prefixed with "http://". Such URIs are now prefixed with "https://" instead. +++ *** New user option 'rcirc-log-time-format'. This allows for rcirc logs to use a custom timestamp format, than the chat buffers use by default. --- *** New user option 'Buffer-menu-group-by'. It controls how buffers are divided into groups that are displayed with headings using Outline minor mode. Using commands that mark buffers on the outline heading line will mark all buffers in the outline. +++ *** New command 'Buffer-menu-toggle-internal'. This command toggles the display of internal buffers in Buffer Menu mode; that is, buffers not visiting a file and whose names start with a space. Previously, such buffers were never shown. This command is bound to 'I' in Buffer Menu mode. --- *** nXML Mode now comes with schemas for Mono/.NET development. The following new XML schemas are now supported: - MSBuild project files - Dotnet package properties files - Dotnet resource extension files - Dotnet Application config files - Nuget config file - Nuget package specification file - Nuget packages config file ** color.el now supports the Oklab color representation. * New Modes and Packages in Emacs 30.1 +++ ** New package Track-Changes. This library is a layer of abstraction above 'before-change-functions' and 'after-change-functions' which provides a superset of the functionality of 'after-change-functions': - It provides the actual previous text rather than only its length. - It takes care of accumulating and bundling changes until a time when its client finds it convenient to react to them. - It detects most cases where some changes were not properly reported (calls to 'before/after-change-functions' that are incorrectly paired, missing, etc...) and reports them adequately. ** New major modes based on the tree-sitter library +++ *** New major mode 'html-ts-mode'. An optional major mode based on the tree-sitter library for editing HTML files. --- *** New major mode 'heex-ts-mode'. A major mode based on the tree-sitter library for editing HEEx files. --- *** New major mode 'elixir-ts-mode'. A major mode based on the tree-sitter library for editing Elixir files. --- *** New major mode 'lua-ts-mode'. A major mode based on the tree-sitter library for editing Lua files. --- *** New major mode 'php-ts-mode'. A major mode based on the tree-sitter library for editing PHP files. ** Minibuffer and Completions +++ *** New global minor mode 'minibuffer-regexp-mode'. This is a minor mode for editing regular expressions in the minibuffer. It highlights parens via ‘show-paren-mode’ and ‘blink-matching-paren’ in a user-friendly way, avoids reporting alleged paren mismatches and makes sexp navigation more intuitive. +++ *** New minor mode 'completion-preview-mode'. This minor mode shows you symbol completion suggestions as you type, using an inline preview. New user options in the 'completion-preview' customization group control exactly when Emacs displays this preview. 'completion-preview-mode' is buffer-local, to enable it globally use 'global-completion-preview-mode'. --- ** The highly accessible Modus themes collection has eight items. The 'modus-operandi' and 'modus-vivendi' are the main themes that have been part of Emacs since version 28. The former is light, the latter dark. In addition to these, we now have 'modus-operandi-tinted' and 'modus-vivendi-tinted' for easier legibility, as well as 'modus-operandi-deuteranopia', 'modus-vivendi-deuteranopia', 'modus-operandi-tritanopia', and 'modus-vivendi-tritanopia' to cover the needs of users with red-green or blue-yellow color deficiency. The Info manual "(modus-themes) Top" describes the details and showcases all their customization options. +++ ** New global minor mode 'etags-regen-mode'. This minor mode generates the tags table automatically based on the current project configuration, and later updates it as you edit the files and save the changes. +++ ** New package Compat. Emacs now comes with a stub implementation of the forwards-compatibility Compat package from GNU ELPA. This allows built-in packages to use the library more effectively, and helps preventing the installation of Compat if unnecessary. +++ ** New package PEG. Emacs now includes a library for writing Parsing Expression Grammars (PEG), an approach to text parsing that provides more structure than regular expressions, but less complexity than context-free grammars. The Info manual "(elisp) Parsing Expression Grammars" has documentation and examples. ** New major mode 'shell-command-mode'. This mode is used by default for the output of asynchronous 'shell-command'. To revert to the previous behavior, set the (also new) variable 'async-shell-command-mode' to 'shell-mode'. Any hooks or mode-specific variables used should be adapted appropriately. +++ ** New package Window-Tool-Bar. This provides a new minor mode, 'window-tool-bar-mode'. When this minor mode is enabled, a tool bar is displayed at the top of a window. To conserve space, no tool bar is shown if 'tool-bar-map' is nil. The global minor mode 'global-window-tool-bar-mode' enables this minor mode in all buffers. * Incompatible Lisp Changes in Emacs 30.1 --- ** 'subr-native-elisp-p' is renamed to 'native-comp-function-p'. The previous name still exists but is marked as obsolete. +++ ** Evaluating a 'lambda' returns an object of type 'interpreted-function'. Instead of representing interpreted functions as lists that start with either 'lambda' or 'closure', Emacs now represents them as objects of their own 'interpreted-function' type, which is very similar to 'byte-code-function' objects (the argument list, docstring, and interactive forms are placed in the same slots). Lists that start with 'lambda' are now used only for non-evaluated functions (in other words, for source code), but for backward compatibility reasons, 'functionp' still recognizes them as functions and you can still call them as before. Thus code that attempts to "dig" into the internal structure of an interpreted function's object with the likes of 'car' or 'cdr' will no longer work and will need to use 'aref' instead to extract its various subparts (when 'interactive-form', 'documentation', and 'help-function-arglist' aren't adequate). +++ ** 'define-globalized-minor-mode' requires that modes use 'run-mode-hooks'. Minor modes defined with 'define-globalized-minor-mode', such as 'global-font-lock-mode', will not be enabled any more in those buffers whose major modes fail to use 'run-mode-hooks'. Major modes defined with 'define-derived-mode' are not affected. 'run-mode-hooks' has been the recommended way to run major mode hooks since Emacs 22. --- ** Old derived.el functions removed. The following functions have been deleted because they were only used by code compiled with Emacs<21: 'derived-mode-init-mode-variables', 'derived-mode-merge-abbrev-tables', 'derived-mode-merge-keymaps', 'derived-mode-merge-syntax-tables', 'derived-mode-run-hooks', 'derived-mode-set-abbrev-table', 'derived-mode-set-keymap', 'derived-mode-set-syntax-table', 'derived-mode-setup-function-name'. +++ ** 'M-TAB' now invokes 'completion-at-point' also in Text mode. By default, Text mode no longer binds 'M-TAB' to 'ispell-complete-word'. Instead, this mode arranges for 'completion-at-point', globally bound to 'M-TAB', to perform word completion as well. You can have Text mode bind 'M-TAB' to 'ispell-complete-word' as it did in previous Emacs versions, or disable Ispell word completion in Text mode altogether, by customizing the new user option 'text-mode-ispell-word-completion'. ** 'pp' and 'pp-to-string' now always include a terminating newline. In the past they included a terminating newline in most cases but not all. ** 'buffer-match-p' and 'match-buffers' take '&rest args'. They used to take a single '&optional arg' and were documented to use an unreliable hack to try and support condition predicates that don't accept this optional arg. The new semantics makes no such accommodation, but the code still supports it (with a warning) for backward compatibility. ** 'post-gc-hook' runs after updating 'gcs-done' and 'gcs-elapsed'. --- ** The escape sequence '\x' not followed by hex digits is now an error. Previously, '\x' without at least one hex digit denoted character code zero (NUL) but as this was neither intended nor documented or even known by anyone, it is now treated as an error by the Lisp reader. --- ** Connection-local variables are applied in buffers visiting a remote file. This overrides possible directory-local or file-local variables with the same name. --- ** User option 'tramp-completion-reread-directory-timeout' has been removed. This user option has been obsoleted in Emacs 27, use 'remote-file-name-inhibit-cache' instead. --- ** User options 'eshell-NAME-unload-hook' are now obsolete. These hooks were named incorrectly, and so they never actually ran when unloading the corresponding feature. Instead, you should use hooks named after the feature name, like 'esh-mode-unload-hook'. +++ ** 'copy-tree' now copies records when its optional 2nd argument is non-nil. +++ ** Regexp zero-width assertions followed by operators are better defined. Previously, regexps such as "xy\\B*" would have ill-defined behavior. Now any operator following a zero-width assertion applies to that assertion only (which is useless). For historical compatibility, an operator character following '^' or '\`' becomes literal, but we advise against relying on this. --- ** Mode-line mnemonics for some coding-systems have changed. The mode-line mnemonic for 'utf-7' is now the lowercase 'u', to be consistent with the other encodings of this family. The mode-line mnemonic for 'koi8-u' is now 'У', U+0423 CYRILLIC CAPITAL LETTER U, to distinguish between this encoding and the UTF-8/UTF-16 family. If your terminal cannot display 'У', or if you want to get the old behavior back for any other reason, you can do that using the 'coding-system-put' function. For example, the following restores the previous behavior of showing 'U' in the mode line for 'koi8-u': (coding-system-put 'koi8-u :mnemonic ?U) --- ** 'vietnamese-tcvn' is now a coding system alias for 'vietnamese-vscii'. VSCII-1 and TCVN-5712 are different names for the same character encoding. Therefore, the duplicate coding system definition has been dropped in favor of an alias. The mode-line mnemonic for 'vietnamese-vscii' and its aliases is the lowercase letter 'v'. +++ ** Infinities and NaNs no longer act as symbols on non-IEEE platforms. On old platforms like the VAX that do not support IEEE floating-point, tokens like 0.0e+NaN and 1.0e+INF are no longer read as symbols. Instead, the Lisp reader approximates an infinity with the nearest finite value, and a NaN with some other non-numeric object that provokes an error if used numerically. +++ ** X color support compatibility aliases are now marked obsolete. The compatibility aliases 'x-defined-colors', 'x-color-defined-p', 'x-color-values', and 'x-display-color-p' are now obsolete. +++ ** 'easy-mmode-define-{minor,global}-mode' aliases are now obsolete. Use 'define-minor-mode' and 'define-globalized-minor-mode' instead. ** The obsolete calling convention of 'sit-for' has been removed. That convention was: '(sit-for SECONDS MILLISEC &optional NODISP)'. ** The 'millisec' argument of 'sleep-for' has been declared obsolete. Use a float value for the first argument instead. ** 'eshell-process-wait-{seconds,milliseconds}' options are now obsolete. Instead, use 'eshell-process-wait-time', which supports floating-point values. +++ ** Conversion of strings to and from byte-arrays works with multibyte strings. The functions 'dbus-string-to-byte-array' and 'dbus-byte-array-to-string' now accept and return multibyte Lisp strings, encoding to UTF-8 and decoding from UTF-8 internally. This means that the argument to 'dbus-byte-array-to-string' must be a valid UTF-8 byte sequence, and the optional parameter MULTIBYTE of 'dbus-byte-array-to-string' is now obsolete and unused. The argument of 'dbus-string-to-byte-array' should be a regular Lisp string, not a unibyte string. +++ ** 'minibuffer-allow-text-properties' now can be set buffer-local. 'read-from-minibuffer' and functions that use it can take the buffer-local value from the minibuffer. +++ ** 'minibuffer-allow-text-properties' also affects completions. When it has a non-nil value, then completion functions like 'completing-read' don't discard text properties from the returned completion candidate. * Lisp Changes in Emacs 30.1 +++ ** New hook 'hack-dir-local-get-variables-functions'. This can be used to provide support for other directory-local settings beside '.dir-locals.el'. +++ ** 'auto-coding-functions' can know the name of the file. The functions on this hook can now find the name of the file to which the text belongs by consulting the variable 'auto-coding-file-name'. +++ ** New user option 'compilation-safety' to control safety of native code. It's now possible to control how safe is the code generated by native compilation, by customizing this user option. It is also possible to control this at function granularity by using the new 'safety' parameter in the function's 'declare' form. ** New types 'closure' and 'interpreted-function'. 'interpreted-function' is the new type used for interpreted functions, and 'closure' is the common parent type of 'interpreted-function' and 'byte-code-function'. Those new types come with the associated new predicates 'closurep' and 'interpreted-function-p' as well as a new constructor 'make-interpreted-closure'. ** New function 'help-fns-function-name'. For named functions, it just returns the name and otherwise it returns a short "unique" string that identifies the function. In either case, the string is propertized so clicking on it gives further details. ** New function 'cl-type-of'. This function is like 'type-of' except that it sometimes returns a more precise type. For example, for nil and t it returns 'null' and 'boolean' respectively, instead of just 'symbol'. ** New functions 'primitive-function-p' and 'cl-functionp'. 'primitive-function-p' is like 'subr-primitive-p' except that it returns t only if the argument is a function rather than a special-form, and 'cl-functionp' is like 'functionp' except it returns nil for lists and symbols. ** Built-in types have now corresponding classes. At the Lisp level, this means that things like '(cl-find-class 'integer)' will now return a class object, and at the UI level it means that things like 'C-h o integer RET' will show some information about that type. ** New variable 'major-mode-remap-defaults' and function 'major-mode-remap'. The first is like Emacs-29's 'major-mode-remap-alist' but to be set by packages (instead of users). The second looks up those two variables. +++ ** Pcase's functions (in 'pred' and 'app') can specify the argument position. For example, instead of '(pred (< 5))' you can write '(pred (> _ 5))'. +++ ** 'define-advice' now sets the new advice's 'name' property to NAME. Named advices defined with 'define-advice' can now be removed with '(advice-remove SYMBOL NAME)' in addition to '(advice-remove SYMBOL SYMBOL@NAME)'. +++ ** New function 'require-with-check' to detect new versions shadowing. This is like 'require', but it checks whether the argument 'feature' is already loaded, in which case it either signals an error or forcibly reloads the file that defines the feature. +++ ** New variable 'lisp-eval-depth-reserve'. It puts a limit to the amount by which Emacs can temporarily increase 'max-lisp-eval-depth' when handling signals. +++ ** New special form 'handler-bind'. It provides a functionality similar to 'condition-case' except it runs the handler code without unwinding the stack, such that we can record the backtrace and other dynamic state at the point of the error. See the Info node "(elisp) Handling Errors". +++ ** Tooltips on fringes. It is now possible to provide tooltips on fringes by adding special text properties 'left-fringe-help' and 'right-fringe-help'. See the "(elisp) Special Properties" Info node in the Emacs Lisp Reference Manual for more details. +++ ** New 'pop-up-frames' action alist entry for 'display-buffer'. This has the same effect as the variable of the same name and takes precedence over the variable when present. ** New function 'merge-ordered-lists'. Mostly used internally to do a kind of topological sort of inheritance hierarchies. +++ ** 'drop' is now an alias for the function 'nthcdr'. +++ ** New polymorphic comparison function 'value<'. This function returns non-nil if the first argument is less than the second. It works for any two values of the same type with reasonable ordering for numbers, strings, symbols, bool-vectors, markers, buffers and processes. Conses, lists, vectors and records are ordered lexicographically. It is intended as a convenient ordering predicate for sorting, and is likely to be faster than hand-written Lisp functions. +++ ** New 'sort' arguments and features. The 'sort' function can now be called using the signature (sort SEQ &rest KEYWORD-ARGUMENTS) where arguments after the first are keyword/value pairs, all optional: ':key' specifies a function that produces the sorting key from an element, ':lessp' specifies the ordering predicate, defaulting to 'value<', ':reverse' is used to reverse the sorting order, ':in-place is used for in-place sorting, as the default is now to sort a copy of the input. The new signature is less error-prone and reduces the need to write ordering predicates by hand. We recommend that you use the ':key' argument instead of ':lessp' unless a suitable ordering predicate is already available. This can also be used for multi-key sorting: (sort seq :key (lambda (x) (list (age x) (size x) (cost x)))) sorts by the return value of 'age', then by 'size', then by 'cost'. The old signature, '(sort SEQ PREDICATE)', can still be used and sorts its input in-place as before. ** New API for 'derived-mode-p' and control of the graph of major modes. *** 'derived-mode-p' now takes the list of modes as a single argument. The same holds for 'provided-mode-derived-p'. The old calling convention where multiple modes are passed as separate arguments is deprecated. *** New functions to access the graph of major modes. While 'define-derived-mode' still only supports single inheritance, modes can declare additional parents (for tests like 'derived-mode-p') with 'derived-mode-add-parents'. Accessing the 'derived-mode-parent' property directly is now deprecated in favor of the new functions 'derived-mode-set-parent' and 'derived-mode-all-parents'. +++ ** Drag-and-drop functions can now be called once for compound drops. It is now possible for drag-and-drop handler functions to respond to drops incorporating more than one URL. Functions capable of this must set their 'dnd-multiple-handler' symbol properties to a non-nil value. See the Info node "(elisp) Drag and Drop". Incident to this change, the function 'dnd-handle-one-url' has been made obsolete, for it cannot take these new handlers into account. ** New function 're-disassemble' to see the innards of a regexp. If you compiled with '--enable-checking', you can use this to help debug either your regexp performance problems or the regexp engine. +++ ** XLFDs are no longer restricted to 255 characters. 'font-xlfd-name' now returns an XLFD even if it is greater than 255 characters in length, provided that the LONG_XLFDs argument is true. Other features in Emacs which employ XLFDs have been modified to produce and understand XLFDs larger than 255 characters. ** 'defadvice' is marked as obsolete. See the "(elisp) Porting Old Advice" Info node for help converting them to use 'advice-add' or 'define-advice' instead. ** 'cl-old-struct-compat-mode' is marked as obsolete. You may need to recompile our code if it was compiled with Emacs < 24.3. +++ ** New macro 'static-if' for conditional evaluation of code. This macro hides a form from the evaluator or byte-compiler based on a compile-time condition. This is handy for avoiding byte-compilation warnings about code that will never actually run under some conditions. +++ ** Desktop notifications are now supported on the Haiku operating system. The new function 'haiku-notifications-notify' provides a subset of the capabilities of the 'notifications-notify' function in a manner analogous to 'w32-notification-notify'. ** New variable 'haiku-pass-control-tab-to-system'. This sets whether Emacs should pass 'C-TAB' on to the system instead of handling it, fixing a problem where window switching would not activate if an Emacs frame had focus on the Haiku operation system. +++ ** New value 'if-regular' for the REPLACE argument to 'insert-file-contents'. It results in 'insert-file-contents' erasing the buffer instead of preserving markers if the file being inserted is not a regular file, rather than signaling an error. +++ ** New variable 'current-key-remap-sequence'. It is bound to the key sequence that caused a call to a function bound within 'function-key-map' or 'input-decode-map' around those calls. +++ ** The function 'key-translate' can now remove translations. If the second argument TO is nil, the existing key translation is removed. +++ ** New variables describing the names of built in programs. The new variables 'ctags-program-name', 'ebrowse-program-name', 'etags-program-name', 'hexl-program-name', 'emacsclient-program-name' 'movemail-program-name', and 'rcs2log-program-name' should be used instead of "ctags", "ebrowse", "etags", "hexl", "emacsclient", and "rcs2log", when starting one of these built in programs in a subprocess. +++ ** New variable 'case-symbols-as-words' affects case operations for symbols. If non-nil, then case operations such as 'upcase-initials' or 'replace-match' (with nil FIXEDCASE) will treat the entire symbol name as a single word. This is useful for programming languages and styles where only the first letter of a symbol's name is ever capitalized. The default value of this variable is nil. +++ ** 'x-popup-menu' now understands touch screen events. When a 'touchscreen-begin' or 'touchscreen-end' event is passed as the POSITION argument, it will behave as if that event was a mouse event. +++ ** New functions for handling touch screen events. The new functions 'touch-screen-track-tap' and 'touch-screen-track-drag' handle tracking common touch screen gestures from within a command. ** New user option 'safe-local-variable-directories'. This user option names directories in which Emacs will treat all directory-local variables as safe. +++ ** New parameter to 'touchscreen-end' events. CANCEL non-nil establishes that the touch sequence has been intercepted by programs such as window managers and should be ignored with Emacs. ** New variable 'inhibit-auto-fill' to temporarily prevent auto-fill. +++ ** New variable 'secondary-tool-bar-map'. If non-nil, this variable contains a keymap of menu items that are displayed along tool bar items inside 'tool-bar-map'. ** New variable 'completion-lazy-hilit'. Lisp programs that present completion candidates may bind this variable non-nil around calls to functions such as 'completion-all-completions'. This tells the underlying completion styles to skip eager fontification of completion candidates, which improves performance. Such a Lisp program can then use the 'completion-lazy-hilit' function to fontify candidates just in time. ** New primitive 'buffer-last-name'. It returns the name of a buffer before the last time it was renamed or killed. ** New primitive 'marker-last-position'. It returns the last position of a marker in its buffer even if that buffer has been killed. ('marker-position' would return nil in that case.) ** Functions and variables to transpose sexps +++ *** New helper variable 'transpose-sexps-function'. Emacs now can set this variable to customize the behavior of the 'transpose-sexps' function. +++ *** New function 'transpose-sexps-default-function'. The previous implementation is moved into its own function, to be bound by 'transpose-sexps-function'. *** New function 'treesit-transpose-sexps'. Tree-sitter now unconditionally sets 'transpose-sexps-function' for all tree-sitter enabled modes. This functionality utilizes the new 'transpose-sexps-function'. ** Functions and variables to move by program statements *** New variable 'forward-sentence-function'. Major modes can now set this variable to customize the behavior of the 'forward-sentence' command. *** New function 'forward-sentence-default-function'. The previous implementation of 'forward-sentence' is moved into its own function, to be bound by 'forward-sentence-function'. *** New function 'treesit-forward-sentence'. All tree-sitter enabled modes that define 'sentence' in 'treesit-thing-settings' now set 'forward-sentence-function' to call 'treesit-forward-sentence'. ** Functions and variables to move by program sexps *** New function 'treesit-forward-sexp'. Tree-sitter conditionally sets 'forward-sexp-function' for major modes that have defined 'sexp' in 'treesit-thing-settings' to enable sexp-related motion commands. +++ ** Returned strings are never docstrings. Functions and macros whose bodies consist of a single string literal now only return that string; it is not used as a docstring. Example: (defun sing-a-song () "Sing a song.") The above function returns the string '"Sing a song."' but has no docstring. Previously, that string was used as both a docstring and return value, which was never what the programmer wanted. If you want the string to be a docstring, add an explicit return value. This change applies to 'defun', 'defsubst', 'defmacro' and 'lambda' forms; other defining forms such as 'cl-defun' already worked this way. ** New or changed byte-compilation warnings --- *** Warn about missing 'lexical-binding' directive. The compiler now warns if an Elisp file lacks the standard '-*- lexical-binding: ... -*-' cookie on the first line. This line typically looks something like ;;; My little pony mode -*- lexical-binding: t -*- It is needed to inform the compiler about which dialect of ELisp your code is using: the modern dialect with lexical binding or the old dialect with only dynamic binding. Lexical binding avoids some name conflicts and allows the compiler to detect more mistakes and generate more efficient code, so it is recommended. For how to adapt your code to lexical binding, see the manual section "(elisp) Converting to Lexical Binding". If your code cannot be converted to lexical binding, you can insert the line ;;; -*- lexical-binding: nil -*- first in the file to declare that it uses the old dialect. --- *** Warn about empty bodies for more special forms and macros. The compiler now warns about an empty body argument to 'when', 'unless', 'ignore-error' and 'with-suppressed-warnings' in addition to the existing warnings for 'let' and 'let*'. Example: (when (> x 2)) This warning can be suppressed using 'with-suppressed-warnings' with the warning name 'empty-body'. --- *** Warn about quoted error names in 'condition-case' and 'ignore-error'. The compiler now warns about quoted condition (error) names in 'condition-case' and 'ignore-error'. Example: (condition-case nil (/ x y) ('arith-error "division by zero")) Quoting them adds the error name 'quote' to those handled or ignored respectively, which was probably not intended. --- *** Warn about comparison with literal constants without defined identity. The compiler now warns about comparisons by identity with a literal string, cons, vector, record, function, large integer or float as this may not match any value at all. Example: (eq x "hello") Only literals for symbols and small integers (fixnums), including characters, are guaranteed to have a consistent (unique) identity. This warning applies to 'eq', 'eql', 'memq', 'memql', 'assq', 'rassq', 'remq' and 'delq'. To compare by (structural) value, use 'equal', 'member', 'assoc', 'rassoc', 'remove' or 'delete' instead. Floats and bignums can also be compared using 'eql', '=' and 'memql'. Function literals cannot be compared reliably at all. This warning can be suppressed using 'with-suppressed-warnings' with the warning name 'suspicious'. --- *** Warn about 'condition-case' without handlers. The compiler now warns when the 'condition-case' form is used without any actual handlers, as in (condition-case nil (read buffer)) because it has no effect other than the execution of the body form. In particular, no errors are caught or suppressed. If the intention was to catch all errors, add an explicit handler for 'error', or use 'ignore-error' or 'ignore-errors'. This warning can be suppressed using 'with-suppressed-warnings' with the warning name 'suspicious'. --- *** Warn about 'unwind-protect' without unwind forms. The compiler now warns when the 'unwind-protect' form is used without any unwind forms, as in (unwind-protect (read buffer)) because the behavior is identical to that of the argument; there is no protection of any kind. Perhaps the intended unwind forms have been misplaced or forgotten, or the use of 'unwind-protect' could be simplified away. This warning can be suppressed using 'with-suppressed-warnings' with the warning name 'suspicious'. --- *** Warn about useless trailing 'cond' clauses. The compiler now warns when a 'cond' form contains clauses following a default (unconditional) clause. Example: (cond ((= x 0) (say "none")) (t (say "some")) (say "goodbye")) Such a clause will never be executed but is likely to be a mistake, perhaps due to misplaced brackets. This warning can be suppressed using 'with-suppressed-warnings' with the warning name 'suspicious'. --- *** Warn about mutation of constant values. The compiler now warns about code that modifies program constants in some obvious cases. Examples: (setcar '(1 2) 7) (aset [3 4] 0 8) (aset "abc" 1 ?d) Such code may have unpredictable behavior because the constants are part of the program, not data structures generated afresh during execution, and the compiler does not expect them to change. To avoid the warning, operate on an object created by the program (maybe a copy of the constant), or use a non-destructive operation instead. This warning can be suppressed using 'with-suppressed-warnings' with the warning name 'mutate-constant'. --- *** Warn about more ignored function return values. The compiler now warns when the return value from certain functions is implicitly ignored. Example: (progn (nreverse my-list) my-list) will elicit a warning because it is usually pointless to call 'nreverse' on a list without using the returned value. To silence the warning, make use of the value in some way, such as assigning it to a variable. You can also wrap the function call in '(ignore ...)', or use 'with-suppressed-warnings' with the warning name 'ignored-return-value'. The warning will only be issued for calls to functions declared 'important-return-value' or 'side-effect-free' (but not 'error-free'). --- *** Warn about docstrings that contain control characters. The compiler now warns about docstrings with control characters other than newline and tab. This is often a result of improper escaping. Example: (defun my-fun () "Uses c:\remote\dir\files and the key \C-x." ...) where the docstring contains the four control characters 'CR', 'DEL', 'FF' and 'C-x'. The warning name is 'docstrings-control-chars'. --- *** The warning about wide docstrings can now be disabled separately. Its warning name is 'docstrings-wide'. --- ** New user option 'native-comp-async-warnings-errors-kind'. It allows control of what kinds of warnings and errors from asynchronous native compilation are reported to the parent Emacs process. The default is to report all errors and only important warnings. If you were used to customizing 'native-comp-async-report-warnings-errors' to nil or 'silent', we suggest that you now leave it at its default value, and see if you get only warnings that matter. ** Function 'declare' forms +++ *** New 'ftype' function declaration. The declaration '(ftype TYPE)' specifies the type of a function. Example: (defun hello (x y) (declare (ftype (function (integer boolean) string))) ...) specifies that the function takes two arguments, an integer and a boolean, and returns a string. If the compilation happens with 'compilation-safety' set to zero, this information can be used by the native compiler to produce better code, but specifying an incorrect type may lead to Emacs crashing. See the Info node "(elisp) Declare Form" for further information. +++ *** New 'important-return-value' function declaration and property. The declaration '(important-return-value t)' sets the 'important-return-value' property which indicates that the function return value should probably not be thrown away implicitly. ** Bytecode is now always loaded eagerly. Bytecode compiled with older Emacs versions for lazy loading using 'byte-compile-dynamic' is now loaded all at once. As a consequence, 'fetch-bytecode' has no use, does nothing, and is now obsolete. The variable 'byte-compile-dynamic' has no effect any more; compilation will always yield bytecode for eager loading. +++ ** New functions 'file-user-uid' and 'file-group-gid'. These functions are like 'user-uid' and 'group-gid', respectively, but are aware of file name handlers, so they will return the remote UID or GID for remote files (or -1 if the connection has no associated user). +++ ** 'fset', 'defalias' and 'defvaralias' now signal an error for cyclic aliases. Previously, 'fset', 'defalias' and 'defvaralias' could be made to build circular function and variable indirection chains as in (defalias 'able 'baker) (defalias 'baker 'able) but trying to use them would sometimes make Emacs hang. Now, an attempt to create such a loop results in an error. Since circular alias chains now cannot occur, 'function-alias-p', 'indirect-function' and 'indirect-variable' will never signal an error. Their 'noerror' arguments have no effect and are therefore obsolete. +++ ** 'treesit-font-lock-rules' now accepts additional global keywords. When supplied with ':default-language LANGUAGE', rules after it will default to use 'LANGUAGE'. --- ** New optional argument to 'modify-dir-local-variable'. A 5th argument, optional, has been added to 'modify-dir-local-variable'. It can be used to specify which dir-locals file to modify. ** Connection local variables +++ *** New macros 'connection-local-p' and 'connection-local-value'. The former macro returns non-nil if a variable has a connection-local binding. The latter macro returns the connection-local value of a variable if any, or its current value. ** Hash tables +++ *** ':rehash-size' and ':rehash-threshold' args no longer have any effect. These keyword arguments are now ignored by 'make-hash-table'. Emacs manages the memory for all hash table objects in the same way. The functions 'hash-table-rehash-size' and 'hash-table-rehash-threshold' remain for compatibility but now always return the old default values. +++ *** The printed representation has been shrunk and simplified. The 'test' parameter is omitted if it is 'eql' (the default), as is 'data' if empty. 'rehash-size', 'rehash-threshold' and 'size' are always omitted, and ignored if present when the object is read back in. ** Obarrays +++ *** New obarray type. Obarrays are now represented by an opaque type instead of using vectors. They are created by 'obarray-make' and manage their internal storage automatically, which means that the size parameter to 'obarray-make' can safely be omitted. That is, they do not become slower as they fill up. The old vector representation is still accepted by functions operating on obarrays, but 'obarrayp' only returns t for obarray objects. 'type-of' now returns 'obarray' for obarray objects. Old code which (incorrectly) created "obarrays" as Lisp vectors filled with something other than 0, as in '(make-vector N nil)', will no longer work, and should be rewritten to use 'obarray-make'. Alternatively, you can fill the vector with 0. +++ *** New function 'obarray-clear' removes all symbols from an obarray. --- *** 'obarray-size' and 'obarray-default-size' are now obsolete. They pertained to the internal storage size which is now irrelevant. +++ ** 'treesit-install-language-grammar' can handle local directory instead of URL. It is now possible to pass a directory of a local repository as URL inside 'treesit-language-source-alist', so that calling 'treesit-install-language-grammar' would avoid cloning the repository. It may be useful, for example, for the purposes of bisecting a treesitter grammar. +++ ** New buffer-local variable 'tabulated-list-groups'. It controls display and separate sorting of groups of entries. +++ ** New variable 'revert-buffer-restore-functions'. It helps to preserve various states after reverting the buffer. --- ** New text property 'context-menu-functions'. Like the variable with the same name, it adds menus from the list that is the value of the property to context menus shown when clicking on the text which as this property. --- ** Detecting the end of an iteration of a keyboard macro. 'read-event', 'read-char', and 'read-char-exclusive' no longer return -1 when called at the end of an iteration of the execution of a keyboard macro. Instead, they will transparently continue reading available input (e.g., from the keyboard). If you need to detect the end of a macro iteration, check the following condition before calling one of the aforementioned functions: (and (arrayp executing-kbd-macro) (>= executing-kbd-macro-index (length executing-kbd-macro))) +++ ** 'vtable-update-object' updates an existing object with just two arguments. It is now possible to update the representation of an object in a vtable by calling 'vtable-update-object' with just the vtable and the object as arguments. (Previously the 'old-object' argument was required which, in this case, would mean repeating the object in the argument list.) When replacing an object with a different one, passing both the new and old objects is still necessary. ** 'vtable-insert-object' can insert "before" or at an index. The signature of 'vtable-insert-object' has changed and is now: (vtable-insert-object TABLE OBJECT &optional LOCATION BEFORE) LOCATION corresponds to the old AFTER-OBJECT argument; if BEFORE is non-nil, the new object is inserted before the LOCATION object, making it possible to insert a new object at the top of the table. (Before, this was not possible.) In addition, LOCATION can be an integer, a (zero-based) index into the table at which the new object is inserted (BEFORE is ignored in this case). ** JSON --- *** The parser keeps duplicated object keys in alist and plist output. A JSON object such as '{"a":1,"a":2}' will now be translated into the Lisp values '((a . 1) (a . 2))' or '(:a 1 :a 2)' if alist or plist object types are requested. --- *** The parser sometimes signals different types of errors. It will now signal 'json-utf8-decode-error' for inputs that are not correctly UTF-8 encoded. --- *** The parser and encoder now accept arbitrarily large integers. Previously, they were limited to the range of signed 64-bit integers. ** New tree-sitter functions and variables for defining and using "things" +++ *** New variable 'treesit-thing-settings'. It allows modes to define "things" like 'defun', 'text', 'sexp', and 'sentence' for navigation commands and tree-traversal functions. +++ *** New functions for navigating "things". There are new navigation functions 'treesit-thing-prev', 'treesit-thing-next', 'treesit-navigate-thing', 'treesit-beginning-of-thing', and 'treesit-end-of-thing'. +++ *** New functions 'treesit-thing-at', 'treesit-thing-at-point'. +++ *** Tree-traversing functions. The functions 'treesit-search-subtree', 'treesit-search-forward', 'treesit-search-forward-goto', and 'treesit-induce-sparse-tree' now accept more kinds of predicates. Lisp programs can now use thing symbols (defined in 'treesit-thing-settings') and any thing definitions for the predicate argument. ** Other tree-sitter function and variable changes +++ *** 'treesit-parser-list' now takes additional optional arguments. The additional arguments are LANGUAGE and TAG. If LANGUAGE is given, only return parsers for that language. If TAG is given, only return parsers with that tag. Note that passing nil as tag doesn't mean return all parsers, but rather "all parsers with no tags". +++ *** New variable 'treesit-primary-parser'. This variable should be set by multi-langauge major modes before calling 'treesit-major-mode-setup', in order for tree-sitter integration functionalities to operate correctly. * Changes in Emacs 30.1 on Non-Free Operating Systems ** MS-Windows +++ *** You can now opt out of following the system's Dark mode. By default, Emacs on MS-Windows follows the system's Dark mode for its title bars' and scroll bars' appearance. If the new user option 'w32-follow-system-dark-mode' is customized to the nil value, Emacs will disregard the system's Dark mode and will always use the default Light mode. --- *** You can now use Image-Dired even if 'convert' command is not installed. If you don't have GraphicsMagick or ImageMagick installed, and thus the 'gm convert'/'convert' command is not available, Emacs on MS-Windows will now use its own function 'w32image-create-thumbnail' to create thumbnail images and show them in the thumbnail buffer. Unlike with using 'convert', this fallback method is synchronous, so Emacs will wait until all the thumbnails are created and displayed, before showing them. --- *** Emacs on MS-Windows now supports the ':stipple' face attribute. ---------------------------------------------------------------------- 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: