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@@ -1,1905 +1,1926 @@ GNU Emacs NEWS -- history of user-visible changes. -Copyright (C) 2016-2019 Free Software Foundation, Inc. +Copyright (C) 2017-2019 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 26. +This file is about changes in Emacs version 27. See file HISTORY for a list of GNU Emacs versions and release dates. -See files NEWS.25, NEWS.24, ..., NEWS.18, and NEWS.1-17 for changes +See files NEWS.26, NEWS.25, ..., NEWS.18, and NEWS.1-17 for changes in older Emacs versions. You can narrow news to a specific version by calling 'view-emacs-news' with a prefix argument or by typing 'C-u C-h C-n'. - -* Installation Changes in Emacs 26.2 - -** Building Emacs with the '--with-xwidgets' option now requires WebKit2. -To build Emacs with xwidgets support, you will need to install the -webkit2gtk-4.0 package; version 2.12 or later is required. -(This change was actually made in Emacs 26.1, but was not called out -in its NEWS.) - -** Installing Emacs now installs the emacs-module.h file. -The emacs-module.h file is now installed in the system-wide include -directory as part of the Emacs installation. This allows to build -Emacs modules outside of the Emacs source tree. - - -* Startup Changes in Emacs 26.2 - - -* Changes in Emacs 26.2 - -** Emacs is now compliant with the latest version 11.0 of the Unicode Standard. - -** New variable 'xft-ignore-color-fonts'. -Default t means don't try to load color fonts when using Xft, as they -often cause crashes. Set it to nil if you really need those fonts. - - -* Editing Changes in Emacs 26.2 - - -* Changes in Specialized Modes and Packages in Emacs 26.2 - -** Dired - -*** The 'Z' command on a directory name compresses all of its files. -It produces a compressed '.tar.gz' archive with all the files in the -directory and all of its subdirectories. For symmetry, 'Z' on a -'.tar.gz' or a '.tgz' archive extracts all the archived files into the -current directory; thus, typing 'Z' on a '.tar.gz' archive created by -a previous 'Z' command will extract the archived files into a -directory whose name is the archive name sans the '.tar.gz' extension. -(This change was actually made in Emacs 25.1 but was only -partially called out in its NEWS; 'tgz' handling was added in 26.1.) - -** Ibuffer - -*** New toggle 'ibuffer-do-toggle-lock', bound to 'L'. - -** Imenu - -*** The value for 'imenu-auto-rescan-maxout' has been increased to 600000. - -** Gnus - -*** Mailutils movemail will now be used if found at runtime. -The default value of 'mail-source-movemail-program' is now "movemail". -This ensures that the movemail program from GNU Mailutils will be used -if found in 'exec-path', even if it was not found at build time. To -use a different program, customize 'mail-source-movemail-program' to the -absolute file name of the desired executable. - -** Shadowfile - -*** shadowfile.el has been rewritten to support Tramp file names. - -** Shell mode - -*** Shell mode buffers now have 'scroll-conservatively' set to 101. -This is so as to better emulate the scrolling behavior of a text -terminal when new output is added to the screen buffer. To get back -the previous behavior, reset 'scroll-conservatively' to zero (or any -other value you like) in a function and add it to 'shell-mode-hook'. -(This change was actually made in Emacs 26.1, but was not called out -in its NEWS.) - -** VC - -*** VC support for Mercurial was improved. -Emacs now avoids invoking 'hg' as much as possible, for faster operation. -(This and the following changes were actually made in Emacs 26.1, but -were not called out in its NEWS.) - -**** New vc-hg options. -The new option 'vc-hg-parse-hg-data-structures' controls whether vc-hg -will try parsing the Mercurial data structures directly instead of -running 'hg'; it defaults to t (set to nil if you want the pre-26.1 -behavior). -The new option 'vc-hg-symbolic-revision-styles' controls how versions -in a Mercurial repository are presented symbolically on the mode line. -The new option 'vc-hg-use-file-version-for-mode-line-version' controls -whether the version shown on the mode line is that of the visited file -or of the repository working copy. - -**** Display of Mercurial revisions in the mode line has changed. -Previously, the mode line displayed the local number (1, 2, 3, ...) of -the revision. Starting with Emacs 26.1, the default has changed, and -it now shows the global revision number, in the form of its changeset -hash value. To get back the previous behavior, customize the new -option 'vc-hg-symbolic-revision-styles' to the value '("{rev}")'. - - -* New Modes and Packages in Emacs 26.2 +Temporary note: ++++ indicates that all necessary documentation updates are complete. + (This means all relevant manuals in doc/ AND lisp doc-strings.) +--- means no change in the manuals is needed. +When you add a new item, use the appropriate mark if you are sure it applies, -* Incompatible Lisp Changes in Emacs 26.2 - -** shadowfile config files have changed their syntax. -Existing files "~/.emacs.d/shadows" and "~/.emacs.d/shadow_todo" must -be removed prior using the changed 'shadow-*' commands. - -** 'thread-alive-p' has been renamed to 'thread-live-p'. -The old name is an alias of the new name. Future Emacs version will -obsolete it. - -** 'while-no-input' does not return due to input from subprocesses. -Input that arrived from subprocesses while some code executed inside -the 'while-no-input' form injected an internal buffer-switch event -that counted as input and would cause 'while-no-input' to return, -perhaps prematurely. These buffer-switch events are now by default -ignored by 'while-no-input'; if you need to get the old behavior, -remove 'buffer-switch' from the list of events in -'while-no-input-ignore-events'. +* Installation Changes in Emacs 27.1 + +** Emacs now uses GMP, the GNU Multiple Precision library. +By default, if 'configure' does not find a suitable libgmp, it +arranges for the included mini-gmp library to be built and used. +The new 'configure' option '--without-libgmp' uses mini-gmp even if a +suitable libgmp is available. + +** The new configure option '--with-json' adds support for JSON using +the Jansson library. It is on by default; use './configure +--with-json=no' to build without Jansson support. The new JSON +functions 'json-serialize', 'json-insert', 'json-parse-string', and +'json-parse-buffer' are typically much faster than their Lisp +counterparts from json.el. + +** Several configure options now accept an option-argument 'ifavailable'. +For example, './configure --with-xpm=ifavailable' now configures Emacs +to attempt to use libxpm but to continue building even if libxpm is absent. +The other affected options are --with-gif, --with-gnutls, --with-jpeg, +--with-png, and --with-tiff. + +** The etags program now uses the C library's regular expression matcher +when possible, and a compatible regex substitute otherwise. This will +let developers maintain Emacs's own regex code without having to also +support other programs. The new configure option '--without-included-regex' +forces etags to use the C library's regex matcher even if the regex +substitute ordinarily would be used to work around compatibility problems. + +** Emacs has been ported to the '-fcheck-pointer-bounds' option of GCC. +This causes Emacs to check bounds of some arrays addressed by its +internal pointers, which can be helpful when debugging the Emacs +interpreter or modules that it uses. If your platform supports it you +can enable it when configuring, e.g., './configure CFLAGS="-g3 -O2 +-mmpx -fcheck-pointer-bounds"' on Intel MPX platforms. + +** Emacs now normally uses a C pointer type instead of a C integer +type to implement Lisp_Object, which is the fundamental machine word +type internal to the Emacs Lisp interpreter. This change aims to +catch typos and supports '-fcheck-pointer-bounds'. The 'configure' +option '--enable-check-lisp-object-type' is therefore no longer as +useful and so is no longer enabled by default in developer builds, +to reduce differences between developer and production builds. + ++++ +** Emacs now uses a "portable dumper" instead of unexec. +This improves compatibility with memory allocation on modern systems, +and in particular better supports the Address Space Layout +Randomization (ASLR) feature, a security technique used by most modern +operating systems. + +Portable dumping can be disabled at configure time via the configure +option '--with-dumping=unexec' (but we don't recommend that, unless +the portable dumping doesn't work on your system for some +reason---please report such systems to the Emacs developers as bugs). + +When built with the portable dumping support (which is the default), +Emacs looks for the 'emacs.pdmp' file, generated during the build, in +its data directory at startup, and loads the dumped state from there. +The new command-line argument '--dump-file=FILE' allows to specify a +non-default '.pdmp' file to load the state from; see the node "Initial +Options" in the Emacs manual for more information. + ++++ +** The new configure option '--enable-checking=structs' attempts to +check that the portable dumper code has been updated to match the last +change to one of the data structures that it relies on. -* Lisp Changes in Emacs 26.2 - -** The new function 'read-answer' accepts either long or short answers -depending on the new customizable variable 'read-answer-short'. - -** New function 'assoc-delete-all'. -Like 'assq-delete-all', but uses 'equal' for comparison. - -** The function 'thing-at-point' behaves as before Emacs 26.1. -The behavior of 'thing-at-point' when called with argument 'list' has -changed in Emacs 26.1, in that it didn't consider text inside comments -and strings as a potential list. This change is now reverted, and -'thing-at-point' behaves like it did before Emacs 26.1. - -** To cater to use cases where comments and strings are to be ignored -when looking for a list, the function 'list-at-point' now takes an -optional argument to do so. +* Startup Changes in Emacs 27.1 + ++++ +** Emacs can now be configured using an early init file. +The file is called 'early-init.el', in 'user-emacs-directory'. It is +loaded very early in the startup process: before graphical elements +such as the tool bar are initialized, and before the package manager +is initialized. The primary purpose is to allow customizing how the +package system is initialized given that initialization now happens +before loading the regular init file (see below). + +We recommend against putting any customizations in this file that +don't need to be set up before initializing installed add-on packages, +because the early init file is read too early into the startup +process, and some important parts of the Emacs session, such as +'window-system' and other GUI features, are not yet set up, which could +make some customization fail to work. + ++++ +** Installed packages are now activated *before* loading the init file. +This is part of a change intended to eliminate the behavior of +package.el inserting a call to 'package-initialize' into the init +file, which was previously done when Emacs was started. As a result +of this change, it is no longer necessary to call 'package-initialize' +in your init file. + +However, if your init file changes the values of 'package-load-list' or +'package-user-dir', or sets 'package-enable-at-startup' to nil then it won't +work right without some adjustment: +- you can move that code to the early init file (see above), so those settings + apply before Emacs tries to activate the packages. +- you can use the new 'package-quickstart' so activation of packages does not + need to pay attention to 'package-load-list' or 'package-user-dir' any more. + +--- +** Emacs now notifies systemd when startup finishes or shutdown begins. +Units that are ordered after 'emacs.service' will only be started +after Emacs has finished initialization and is ready for use. +(If your Emacs is installed in a non-standard location and you copied the +emacs.service file to eg "~/.config/systemd/user/", you will need to copy +the new version of the file again.) -* Changes in Emacs 26.2 on Non-Free Operating Systems - -** macOS features can now be detected at run-time as well as at -build-time. See nextstep/INSTALL for details. -(This change was actually made in Emacs 26.1, but was undocumented and -not called out in its NEWS.) - - -* Installation Changes in Emacs 26.1 - -** By default libgnutls is now required when building Emacs. -Use 'configure --with-gnutls=no' to build even when GnuTLS is missing. - -** GnuTLS version 2.12.2 or later is now required, instead of merely -version 2.6.6 or later. - -** The new option 'configure --with-mailutils' causes Emacs to rely on -GNU Mailutils to retrieve email. It is recommended, and is the -default if GNU Mailutils is installed. When '--with-mailutils' is not -in effect, the Emacs build procedure by default continues to build and -install a limited 'movemail' substitute that retrieves POP3 email only -via insecure channels. To avoid this problem, use either -'--with-mailutils' or '--without-pop' when configuring; '--without-pop' -is the default on platforms other than native MS-Windows. - -** The new option 'configure --enable-gcc-warnings=warn-only' causes -GCC to issue warnings without stopping the build. This behavior is -now the default in developer builds. As before, use -'--disable-gcc-warnings' to suppress GCC's warnings, and -'--enable-gcc-warnings' to stop the build if GCC issues warnings. - -** When GCC warnings are enabled, '--enable-check-lisp-object-type' is -now enabled by default when configuring. - -** The Emacs server now has socket-launching support. -This allows socket based activation, where an external process like -systemd can invoke the Emacs server process upon a socket connection -event and hand the socket over to Emacs. Emacs uses this socket to -service emacsclient commands. This new functionality can be disabled -with the configure option '--disable-libsystemd'. - -** A systemd user unit file is provided. -Use it in the standard way: 'systemctl --user enable emacs'. (If your -Emacs is installed in a non-standard location, you may need to copy -the emacs.service file to eg ~/.config/systemd/user/) - -** New configure option '--disable-build-details' attempts to build an -Emacs that is more likely to be reproducible; that is, if you build -and install Emacs twice, the second Emacs is a copy of the first. -Deterministic builds omit the build date from the output of the -'emacs-version' and 'erc-cmd-SV' functions, and the leave the -following variables nil: 'emacs-build-system', 'emacs-build-time', -'erc-emacs-build-time'. - -** Emacs can now be built with support for Little CMS. -If the lcms2 library is installed, Emacs will enable features built on -top of that library. The new configure option '--without-lcms2' can -be used to build without lcms2 support even if it is installed. Emacs -linked to Little CMS exposes color management functions in Lisp: the -color metrics 'lcms-cie-de2000' and 'lcms-cam02-ucs', as well as -functions for conversion to and from CIE CAM02 and CAM02-UCS. - -** The configure option '--with-gameuser' now defaults to 'no', -as this appears to be the most common configuration in practice. -When it is 'no', the shared game directory and the auxiliary program -update-game-score are no longer needed and are not installed. - -** Emacs no longer works on IRIX. We expect that Emacs users are not -affected by this, as SGI stopped supporting IRIX in December 2013. - - -* Startup Changes in Emacs 26.1 - -** New option '--fg-daemon'. This is the same as '--daemon', except -it runs in the foreground and does not fork. This is intended for -modern init systems such as systemd, which manage many of the traditional -aspects of daemon behavior themselves. '--bg-daemon' is now an alias -for '--daemon'. - -** New option '--module-assertions'. -When given this option, Emacs will perform expensive correctness -checks when dealing with dynamic modules. This is intended for module -authors that wish to verify that their module conforms to the module -requirements. The option makes Emacs abort if a module-related -assertion triggers. - -** Emacs now supports 24-bit colors on capable text terminals. -Terminal is automatically initialized to use 24-bit colors if the -required capabilities are found in terminfo. See the FAQ node -"(efaq) Colors on a TTY" for more information. +* Changes in Emacs 27.1 + +** emacsclient + ++++ +*** emacsclient now supports the 'EMACS_SOCKET_NAME' environment variable. +The behavior is identical to 'EMACS_SERVER_FILE', in that the +command-line value specified via '--socket-name' will override the +environment, and the natural default to TMPDIR, then "/tmp", continues +to apply. + ++++ +*** Emacs and emacsclient now default to $XDG_RUNTIME_DIR/emacs +as the directory for client/server sockets, if Emacs is running +under an X Window System desktop that sets the XDG_RUNTIME_DIR +environment variable to indicate where session sockets should go. +To get the old, less-secure behavior, you can set the +EMACS_SOCKET_NAME environment variable to an appropriate value. + +--- +*** When run by root, emacsclient no longer connects to non-root sockets. +(Instead you can use Tramp methods to run root commands in a non-root Emacs.) + +--- +** Control of the threshold for using the 'distant-foreground' color. +The threshold for color distance below which the 'distant-foreground' +color of the face will be used instead of the foreground color can now +be controlled via the new variable 'face-near-same-color-threshold'. +The default value is 30000, as the previously hard-coded threshold. + ++++ +** The function 'read-passwd' uses '*' as default character to hide passwords. + +--- +** The new option 'tooltip-resize-echo-area' avoids truncating tooltip text +on GUI frames when tooltips are displayed in the echo area. Instead, +it resizes the echo area as needed to accommodate the full tool-tip +text. + +--- +** Show mode line tooltips only if the corresponding action applies. +Customize the option 'mode-line-default-help-echo' to restore the old +behavior where the tooltip text is also shown when the corresponding +action does not apply. + ++++ +** New hook 'server-after-make-frame-hook'. +This hook is a convenient place to perform initializations in daemon +mode which require GUI features to be available. One example is +restoration of the previous session using the desktop.el package: put +the call to 'desktop-read' in this hook, if you want the GUI settings +to be restored, or if desktop.el needs to interact with you during +restoration of the session. + ++++ +** New function 'logcount' calculates an integer's Hamming weight. + ++++ +** New function 'libxml-available-p'. +This function returns non-nil if libxml support is both compiled in +and available at run time. Lisp programs should use this function to +detect built-in libxml support, instead of testing for that +indirectly, e.g., by checking that functions like +'libxml-parse-html-region' return nil. + ++++ +** 'libxml-parse-xml-region' and 'libxml-parse-html' region take +a parameter that's called DISCARD-COMMENTS, but it really only +discards the top-level comment. Therefore this parameter is now +obsolete, and the new utility function 'xml-remove-comments' can be +used to remove comments before calling the libxml functions to parse +the data. + ++++ +** The Network Security Manager now allows more fine-grained control +of what checks to run via the 'network-security-protocol-checks' +variable. -** Emacs now obeys the X resource "scrollBar" at startup. -The effect is similar to that of "toolBar" resource on the tool bar. ++++ +** TLS connections have their security tightened by default. +Most of the checks for outdated, believed-to-be-weak TLS algorithms +and ciphers are now switched on by default. By default, the NSM will +flag connections using these weak algorithms and ask users whether to +allow them. To get the old behavior back (where certificates are +checked for validity, but no warnings about weak cryptography are +issued), you can either set 'network-security-protocol-checks' to nil, +or adjust the elements in that variable to only happen on the 'high' +security level (assuming you use the 'medium' level). + ++++ +** Native GnuTLS connections can now use client certificates. +Previously, this support was only available when using the external +gnutls-cli command. Call 'open-network-stream' with +':client-certificate t' to trigger looking up of per-server +certificates via 'auth-source'. + ++++ +** New function 'fill-polish-nobreak-p', to be used in 'fill-nobreak-predicate'. +It blocks line breaking after a one-letter word, also in the case when +this word is preceded by a non-space, but non-alphanumeric character. + ++++ +** The limit on repetitions in regexps has been raised to 2^16-1. +It was previously limited to 2^15-1. For example, the following +regular expression was previously invalid, but is now accepted: + + x\{32768\} + +--- +** The German prefix and postfix input methods now support Capital sharp S. + +--- +** New input methods 'hawaiian-postfix' and 'hawaiian-prefix'. + +--- +** New input methods for several variants of the Sami language. +The Sami input methods include: 'norwegian-sami-prefix', +'bergsland-hasselbrink-sami-prefix', 'southern-sami-prefix', +'ume-sami-prefix', 'northern-sami-prefix', 'inari-sami-prefix', +'skolt-sami-prefix', and 'kildin-sami-prefix'. + ++++ +** In Japanese environments that do not specify encodings and are not +based on MS-Windows, the default encoding is now utf-8 instead of +japanese-iso-8bit. + ++++ +** New function 'exec-path'. +This function by default returns the value of the corresponding +variable, but can optionally return the equivalent of 'exec-path' +from a remote host. + ++++ +** The function 'executable-find' supports an optional argument REMOTE. +This triggers to search the program on the remote host as indicated by +'default-directory'. + ++++ +** New variable 'auto-save-no-message'. +When set to t, no message will be shown when auto-saving (default +value: nil). + +--- +** The value of 'make-cursor-line-fully-visible' can now be a function. +In addition to nil or non-nil, the value can now be a predicate +function. Follow mode uses this to control scrolling of its windows +when the last screen line in a window is not fully visible. + ++++ +** New variable 'emacs-repository-branch'. +It reports the git branch from which Emacs was built. + ++++ +** New user option 'switch-to-buffer-obey-display-actions'. +When non-nil, 'switch-to-buffer' uses 'pop-to-buffer-same-window' that +respects display actions specified by 'display-buffer-alist' and +'display-buffer-overriding-action'. + +** New 'flex' completion style +An implementation of popular "flx/fuzzy/scatter" completion which +matches strings where the pattern appears as a subsequence. Put +simply, makes "foo" complete to both "barfoo" and "frodo". Add 'flex' +to 'completion-styles' or 'completion-category-overrides' to use it. + +** Connection-local variables + ++++ +*** Connection-local variables are applied by default like file-local +and directory-local variables. + ++++ +*** The macro 'with-connection-local-variables' has been renamed from +'with-connection-local-profiles'. No argument 'profiles' needed any +longer. + +--- +** next-error-verbosity controls when `next-error' outputs a message + about the error locus. -* Changes in Emacs 26.1 - -** Option 'buffer-offer-save' can be set to new value, 'always'. -When set to 'always', the command 'save-some-buffers' will always -offer this buffer for saving. - -** Security vulnerability related to Enriched Text mode is removed. - -*** Enriched Text mode does not evaluate Lisp in 'display' properties. -This feature allows saving 'display' properties as part of text. -Emacs 'display' properties support evaluation of arbitrary Lisp forms -as part of processing the property for display, so displaying Enriched -Text could be vulnerable to executing arbitrary malicious Lisp code -included in the text (e.g., sent as part of an email message). -Therefore, execution of arbitrary Lisp forms in 'display' properties -decoded by Enriched Text mode is now disabled by default. Customize -the new option 'enriched-allow-eval-in-display-props' to a non-nil -value to allow Lisp evaluation in decoded 'display' properties. - -This vulnerability was introduced in Emacs 21.1. To work around that -in Emacs versions before 25.3, append the following to your ~/.emacs -init file: - - (eval-after-load "enriched" - '(defun enriched-decode-display-prop (start end &optional param) - (list start end))) - -** Functions in 'write-contents-functions' can fully short-circuit the -'save-buffer' process. Previously, saving a buffer that was not -visiting a file would always prompt for a file name. Now it only does -so if 'write-contents-functions' is nil (or all its functions return -nil). - -** New variable 'executable-prefix-env' for inserting magic signatures. -This variable affects the format of the interpreter magic number -inserted by 'executable-set-magic'. If non-nil, the magic number now -takes the form "#!/usr/bin/env interpreter", otherwise the value -determined by 'executable-prefix', which is by default -"#!/path/to/interpreter". By default, 'executable-prefix-env' is nil, -so the default behavior is not changed. - -** The variable 'emacs-version' no longer includes the build number. -This is now stored separately in a new variable, 'emacs-build-number'. - -** Emacs now provides a limited form of concurrency with Lisp threads. -Concurrency in Emacs Lisp is "mostly cooperative", meaning that -Emacs will only switch execution between threads at well-defined -times: when Emacs waits for input, during blocking operations related -to threads (such as mutex locking), or when the current thread -explicitly yields. Global variables are shared among all threads, but -a 'let' binding is thread-local. Each thread also has its own current -buffer and its own match data. - -See the chapter "(elisp) Threads" in the ELisp manual for full -documentation of these facilities. - -** The new user variable 'electric-quote-chars' provides a list -of curved quotes for 'electric-quote-mode', allowing user to choose -the types of quotes to be used. - -** The new user option 'electric-quote-context-sensitive' makes -'electric-quote-mode' context sensitive. If it is non-nil, you can -type an ASCII apostrophe to insert an opening or closing quote, -depending on context. Emacs will replace the apostrophe by an opening -quote character at the beginning of the buffer, the beginning of a -line, after a whitespace character, and after an opening parenthesis; -and it will replace the apostrophe by a closing quote character in all -other cases. - -** The new variable 'electric-quote-inhibit-functions' controls when -to disable electric quoting based on context. Major modes can add -functions to this list; Emacs will temporarily disable -'electric-quote-mode' whenever any of the functions returns non-nil. -This can be used by major modes that derive from 'text-mode' but allow -inline code segments, such as 'markdown-mode'. - -** The new user variable 'dired-omit-case-fold' allows the user to -customize the case-sensitivity of dired-omit-mode. It defaults to -the same sensitivity as that of the filesystem for the corresponding -dired buffer. - -** Emacs now uses double buffering to reduce flicker when editing and -resizing graphical Emacs frames on the X Window System. This support -requires the DOUBLE-BUFFER extension, which major X servers have -supported for many years. If your system has this extension, but an -Emacs built with double buffering misbehaves on some displays you use, -you can disable the feature by adding - - '(inhibit-double-buffering . t) - -to default-frame-alist. Or inject this parameter into the selected -frame by evaluating this form: - - (modify-frame-parameters nil '((inhibit-double-buffering . t))) - -** The customization group 'wp', whose label was "text", is now -deprecated. Use the new group 'text', which inherits from 'wp', -instead. - -** The new function 'call-shell-region' executes a command in an -inferior shell with the buffer region as input. - -** The new user option 'shell-command-dont-erase-buffer' controls -if the output buffer is erased between shell commands; if non-nil, -the output buffer is not erased; this variable also controls where -to set the point in the output buffer: beginning of the output, -end of the buffer or save the point. -When 'shell-command-dont-erase-buffer' is nil, the default value, -the behavior of 'shell-command', 'shell-command-on-region' and -'async-shell-command' is as usual. - -** The new user option 'async-shell-command-display-buffer' controls -whether the output buffer of an asynchronous command is shown -immediately, or only when there is output. - -** New user option 'mouse-select-region-move-to-beginning'. -This option controls the position of point when double-clicking -mouse-1 on the end of a parenthetical grouping or string-delimiter: -the default value nil keeps point at the end of the region, setting it -to non-nil moves point to the beginning of the region. - -** New user option 'mouse-drag-and-drop-region'. -This option allows you to drag the entire region of text to another -place or another buffer. Its behavior is customizable via the new -options 'mouse-drag-and-drop-region-cut-when-buffers-differ', -'mouse-drag-and-drop-region-show-tooltip', and -'mouse-drag-and-drop-region-show-cursor'. - -** The new user option 'confirm-kill-processes' allows the user to -skip a confirmation prompt for killing subprocesses when exiting -Emacs. When set to t (the default), Emacs will prompt for -confirmation before killing subprocesses on exit, which is the same -behavior as before. - -** 'find-library-name' will now fall back on looking at 'load-history' -to try to locate libraries that have been loaded with an explicit path -outside 'load-path'. - -** Faces in 'minibuffer-prompt-properties' no longer overwrite properties -in the text in functions like 'read-from-minibuffer', but instead are -added to the end of the face list. This allows users to say things -like '(read-from-minibuffer (propertize "Enter something: " 'face 'bold))'. - -** The new variable 'extended-command-suggest-shorter' has been added -to control whether to suggest shorter 'M-x' commands or not. - -** icomplete now respects 'completion-ignored-extensions'. - -** Non-breaking hyphens are now displayed with the 'nobreak-hyphen' -face instead of the 'escape-glyph' face. - -** Approximations to quotes are now displayed with the new 'homoglyph' -face instead of the 'escape-glyph' face. - -** New face 'header-line-highlight'. -This face is the header-line analogue of 'mode-line-highlight'; it -should be the preferred mouse-face for mouse-sensitive elements in the -header line. - -** 'C-x h' ('mark-whole-buffer') will now avoid marking the prompt -part of minibuffers. - -** 'fill-paragraph' no longer marks the buffer as changed unless it -actually changed something. - -** The locale language name 'ca' is now mapped to the language -environment 'Catalan', which has been added. - -** 'align-regexp' has a separate history for its interactive argument. -'align-regexp' no longer shares its history with all other -history-less functions that use 'read-string'. - -** The networking code has been reworked so that it's more -asynchronous than it was (when specifying :nowait t in -'make-network-process'). How asynchronous it is varies based on the -capabilities of the system, but on a typical GNU/Linux system the DNS -resolution, the connection, and (for TLS streams) the TLS negotiation -are all done without blocking the main Emacs thread. To get -asynchronous TLS, the TLS boot parameters have to be passed in (see -the manual for details). - -Certain process oriented functions (like 'process-datagram-address') -will block until socket setup has been performed. The recommended way -to deal with asynchronous sockets is to avoid interacting with them -until they have changed status to "run". This is most easily done -from a process sentinel. - -** 'make-network-process' and 'open-network-stream' sometimes allowed -:service to be an integer string (e.g., :service "993") and sometimes -required an integer (e.g., :service 993). This difference has been -eliminated, and integer strings work everywhere. - -** It is possible to disable attempted recovery on fatal signals. -Two new variables support disabling attempts to recover from stack -overflow and to avoid automatic auto-save when Emacs is delivered a -fatal signal. 'attempt-stack-overflow-recovery', if set to nil, -will disable attempts to recover from C stack overflows; Emacs will -then crash as with any other fatal signal. -'attempt-orderly-shutdown-on-fatal-signal', if set to nil, will -disable attempts to auto-save the session and shut down in an orderly -fashion when Emacs receives a fatal signal; instead, Emacs will -terminate immediately. Both variables are non-nil by default. -These variables are for users who would like to avoid the small -probability of data corruption due to techniques Emacs uses to recover -in these situations. - -** File local and directory local variables are now initialized each -time the major mode is set, not just when the file is first visited. -These local variables will thus not vanish on setting a major mode. - -** A second dir-local file (.dir-locals-2.el) is now accepted. -See the doc string of 'dir-locals-file' for more information. - -** Connection-local variables can be used to specify local variables -with a value depending on the connected remote server. For details, -see the node "(elisp) Connection Local Variables" in the ELisp manual. - -** International domain names (IDNA) are now encoded via the new -puny.el library, so that one can visit Web sites with non-ASCII URLs. - -** The new 'list-timers' command lists all active timers in a buffer, -where you can cancel them with the 'c' command. - -** 'switch-to-buffer-preserve-window-point' now defaults to t. -Applications that call 'switch-to-buffer' and want to show the buffer at -the position of its point should use 'pop-to-buffer-same-window' in lieu -of 'switch-to-buffer'. - -** The new variable 'debugger-stack-frame-as-list' allows displaying -all call stack frames in a Lisp backtrace buffer as lists. Both -debug.el and edebug.el have been updated to heed to this variable. - -** Values in call stack frames are now displayed using 'cl-prin1'. -The old behavior of using 'prin1' can be restored by customizing the -new option 'debugger-print-function'. - -** NUL bytes in text copied to the system clipboard are now replaced with "\0". - -** The new variable 'x-ctrl-keysym' has been added to the existing -roster of X keysyms. It can be used in combination with another -variable of this kind to swap modifiers in Emacs. - -** New input methods: 'cyrillic-tuvan', 'polish-prefix', 'uzbek-cyrillic'. - -** The 'dutch' input method no longer attempts to support Turkish too. -Also, it no longer converts 'IJ' and 'ij' to the compatibility -characters U+0132 LATIN CAPITAL LIGATURE IJ and U+0133 LATIN SMALL -LIGATURE IJ. - -** File name quoting by adding the prefix "/:" is now possible for the -local part of a remote file name. Thus, if you have a directory named -"/~" on the remote host "foo", you can prevent it from being -substituted by a home directory by writing it as "/foo:/:/~/file". - -** The new variable 'maximum-scroll-margin' allows having effective -settings of 'scroll-margin' up to half the window size, instead of -always restricting the margin to a quarter of the window. - -** Emacs can scroll horizontally using mouse, touchpad, and trackbar. -You can enable this by customizing 'mouse-wheel-tilt-scroll'. If you -want to reverse the direction of the scroll, customize -'mouse-wheel-flip-direction'. - -** The default GnuTLS priority string now includes %DUMBFW. -This is to avoid bad behavior in some firewalls, which causes the -connection to be closed by the remote host. - -** Emacsclient changes - -*** Emacsclient has a new option '-u' / '--suppress-output'. -This option suppresses display of return values from the server -process. - -*** Emacsclient has a new option '-T' / '--tramp'. -This helps with using a local Emacs session as the server for a remote -emacsclient. With appropriate setup, one can now set the EDITOR -environment variable on a remote machine to emacsclient, and -use the local Emacs to edit remote files via Tramp. See the node -"(emacs) emacsclient Options" in the user manual for the details. - -*** Emacsclient now accepts command-line options in ALTERNATE_EDITOR -and '--alternate-editor'. For example, ALTERNATE_EDITOR="emacs -Q -nw". -Arguments may be quoted "like this", so that for example an absolute -path containing a space may be specified; quote escaping is not -supported. - -** New user option 'dig-program-options' and extended functionality -for DNS-querying functions 'nslookup-host', 'dns-lookup-host', -and 'run-dig'. Each function now accepts an optional name server -argument interactively (with a prefix argument) and non-interactively. - -** 'describe-key-briefly' now ignores mouse movement events. - -** The new variable 'eval-expression-print-maximum-character' prevents -large integers from being displayed as characters by 'M-:' and similar -commands. - -** Two new commands for finding the source code of Emacs Lisp -libraries: 'find-library-other-window' and 'find-library-other-frame'. - -** The new variable 'display-raw-bytes-as-hex' allows you to change -the display of raw bytes from octal to hex. - -** You can now provide explicit field numbers in format specifiers. -For example, '(format "%2$s %1$s %2$s" "X" "Y")' produces "Y X Y". - -** Emacs now supports optional display of line numbers in the buffer. -This is similar to what 'linum-mode' provides, but much faster and -doesn't usurp the display margin for the line numbers. Customize the -buffer-local variable 'display-line-numbers' to activate this optional -display. Alternatively, you can use the 'display-line-numbers-mode' -minor mode or the global 'global-display-line-numbers-mode'. When -using these modes, customize 'display-line-numbers-type' with the same -value as you would use with 'display-line-numbers'. +* Editing Changes in Emacs 27.1 -Line numbers are not displayed at all in minibuffer windows and in -tooltips, as they are not useful there. - -Lisp programs can disable line-number display for a particular screen -line by putting the 'display-line-numbers-disable' text property or -overlay property on the first character of that screen line. This is -intended for add-on packages that need a finer control of the display. - -Lisp programs that need to know how much screen estate is used up for -line-number display in a window can use the new function -'line-number-display-width'. - -'linum-mode' and all similar packages are henceforth becoming obsolete. -Users and developers are encouraged to switch to this new feature -instead. - -** The new user option 'arabic-shaper-ZWNJ-handling' controls how to -handle ZWNJ in Arabic text rendering. - - -* Editing Changes in Emacs 26.1 - -** New variable 'column-number-indicator-zero-based'. -Traditionally, in Column Number mode, the displayed column number -counts from zero starting at the left margin of the window. This -behavior is now controlled by 'column-number-indicator-zero-based'. -If you would prefer for the displayed column number to count from one, -you may set this variable to nil. (Behind the scenes, there is now a -new mode line construct, '%C', which operates exactly as '%c' does -except that it counts from one.) - -** New single-line horizontal scrolling mode. -The 'auto-hscroll-mode' variable can now have a new special value, -'current-line', which causes only the line where the cursor is -displayed to be horizontally scrolled when lines are truncated on -display and point moves outside the left or right window margin. - -** New mode line constructs '%o' and '%q', and user option -'mode-line-percent-position'. '%o' displays the "degree of travel" of -the window through the buffer. Unlike the default '%p', this -percentage approaches 100% as the window approaches the end of the -buffer. '%q' displays the percentage offsets of both the start and -the end of the window, e.g. "5-17%". The new option -'mode-line-percent-position' makes it easier to switch between '%p', -'%P', and these new constructs. - -** Two new user options 'list-matching-lines-jump-to-current-line' and -'list-matching-lines-current-line-face' to show the current line -highlighted in *Occur* buffer. - -** The 'occur' command can now operate on the region. - -** New bindings for 'query-replace-map'. -'undo', undo the last replacement; bound to 'u'. -'undo-all', undo all replacements; bound to 'U'. - -** 'delete-trailing-whitespace' deletes whitespace after form feed. -In modes where form feed was treated as a whitespace character, -'delete-trailing-whitespace' would keep lines containing it unchanged. -It now deletes whitespace after the last form feed thus behaving the -same as in modes where the character is not whitespace. - -** Emacs no longer prompts about editing a changed file when the file's -content is unchanged. Instead of only checking the modification time, -Emacs now also checks the file's actual content before prompting the user. - -** Various casing improvements. - -*** 'upcase', 'upcase-region' et al. convert title case characters -(such as Dz) into their upper case form (such as DZ). - -*** 'capitalize', 'upcase-initials' et al. make use of title-case forms -of initial characters (correctly producing for example Džungla instead -of incorrect DŽungla). - -*** Characters which turn into multiple ones when cased are correctly handled. -For example, fi ligature is converted to FI when upper cased. - -*** Greek small sigma is correctly handled when at the end of the word. -Strings such as ΌΣΟΣ are now correctly converted to Όσος when -capitalized instead of incorrect Όσοσ (compare lowercase sigma at the -end of the word). - -** Emacs can now auto-save buffers to visited files in a more robust -manner via the new mode 'auto-save-visited-mode'. Unlike -'auto-save-visited-file-name', this mode uses the normal saving -procedure and therefore obeys saving hooks. -'auto-save-visited-file-name' is now obsolete. - -** New behavior of 'mark-defun'. -Prefix argument selects that many (or that many more) defuns. -Negative prefix arg flips the direction of selection. Also, -'mark-defun' between defuns correctly selects N following defuns (or --N previous for negative arguments). Finally, comments preceding the -defun are selected unless they are separated from the defun by a blank -line. - -** New command 'replace-buffer-contents'. -This command replaces the contents of the accessible portion of the -current buffer with the contents of the accessible portion of a -different buffer while keeping point, mark, markers, and text -properties as intact as possible. - -** New commands 'apropos-local-variable' and 'apropos-local-value'. -These are buffer-local versions of 'apropos-variable' and -'apropos-value', respectively. They show buffer-local variables whose -names and values, respectively, match a given pattern. - -** More user control of reordering bidirectional text for display. -The two new variables, 'bidi-paragraph-start-re' and -'bidi-paragraph-separate-re', allow customization of what exactly are -paragraphs, for the purposes of bidirectional display. ++++ +** New command 'make-empty-file'. +--- ** New variable 'x-wait-for-event-timeout'. This controls how long Emacs will wait for updates to the graphical state to take effect (making a frame visible, for example). ++++ +** New user option 'electric-quote-replace-double'. +This option controls whether '"' is replaced in 'electric-quote-mode', +in addition to other quote characters. If non-nil, ASCII double-quote +characters that quote text "like this" are replaced by double +typographic quotes, “like this”, in text modes, and in comments in +non-text modes. + +--- +** New user option 'flyspell-case-fold-duplications'. +This option controls whether Flyspell mode considers consecutive words +to be duplicates if they are not in the same case. If non-nil, the +default, words are considered to be duplicates even if their letters' +case does not match. + +--- +** 'write-abbrev-file' now includes special properties. +'write-abbrev-file' now writes special properties like ':case-fixed' +for abbrevs that have them. + ++++ +** 'write-abbrev-file' skips empty tables. +'write-abbrev-file' now skips inserting a 'define-abbrev-table' form for +tables which do not have any non-system abbrevs to save. + ++++ +** The new functions and commands 'text-property-search-forward' and +'text-property-search-backward' have been added. These provide an +interface that's more like functions like 'search-forward'. + +--- +** More commands support noncontiguous rectangular regions, namely +'upcase-dwim', 'downcase-dwim', 'replace-string', 'replace-regexp'. + ++++ +** When asked to visit a large file, Emacs now offers visiting it literally. +Previously, Emacs would only ask for confirmation before visiting +large files. Now it also offers a third alternative: to visit the +file literally, as in 'find-file-literally', which speeds up +navigation and editing of large files. + +--- +** 'add-dir-local-variable' now uses dotted pair notation syntax to +write alists of variables to ".dir-locals.el". This is the same +syntax that you can see in the example of a ".dir-locals.el" file in +the node "(emacs) Directory Variables" of the user manual. + ++++ +** Network connections using 'local can now use IPv6. +'make-network-process' now uses the correct loopback address when +asked to use :host 'local and :family 'ipv6. + ++++ +** The new function `replace-region-contents' replaces the current +region using a given replacement-function in a non-destructive manner +(in terms of `replace-buffer-contents'). + ++++ +** The command `replace-buffer-contents' now has two optional +arguments mitigating performance issues when operating on huge +buffers. + +** The command 'delete-indentation' now operates on the active region. +If the region is active, the command joins all the lines in the +region. When there's no active region, the command works on the +current and the previous or the next line, as before. + ++++ -* Changes in Specialized Modes and Packages in Emacs 26.1 +* Changes in Specialized Modes and Packages in Emacs 27.1 + +** compile.el +--- +*** In compilation-error-regexp-alist, 'line' (and 'end-line') can be functions + +** cl-lib ++++ +*** cl-defstruct has a new :noinline argument to prevent inlining its functions + +** doc-view-mode +*** New commands doc-view-presentation and doc-view-fit-window-to-page +*** Added support for password-protected PDF files + +** map.el +*** Now also understands plists. +*** Now defined via generic functions that can be extended via 'cl-defmethod'. +*** Deprecate the 'map-put' macro in favor of a new 'map-put!' function. +*** 'map-contains-key' now returns a boolean rather than the key. +*** Deprecate the 'testfn' args of 'map-elt' and 'map-contains-key'. +*** New generic function 'map-insert'. + ++++ +** seq.el +New convenience functions 'seq-first' and 'seq-rest' give easy access +to respectively the first and all but the first elements of sequences. + +The new predicate function 'seq-contains-p' should be used instead of +the now obsolete 'seq-contains'. + +--- +** Follow mode +In the current follow group of windows, "ghost" cursors are no longer +displayed in the non-selected follow windows. To get the old behavior +back, customize 'follow-hide-ghost-cursors' to nil. + +** Windmove + +*** 'windmove-create-window' when non-nil makes a new window on moving off +the edge of the frame. + +*** Windmove supports directional window display and selection. +The new command 'windmove-display-default-keybindings' binds default +keys with provided modifiers (by default, Shift-Meta) to the commands +that display the next buffer in the window at the specified direction. +This is like 'windmove-default-keybindings' that binds keys to commands +that select the window in the specified direction, but additionally it +displays the buffer from the next command in that window. For example, +'S-M-right C-h i' displays the *Info* buffer in the right window, +creating the window if necessary. A special key can be customized to +display the buffer in the same window, for example, 'S-M-0 C-h e' +displays the *Messages* buffer in the same window. + +*** Windmove also supports directional window deletion. +The new command 'windmove-delete-default-keybindings' binds default +keys with provided prefix (by default, 'C-x') and modifiers (by default, +'Shift') to the commands that delete the window in the specified +direction. For example, 'C-x S-down' deletes the window below. +With a prefix arg 'C-u', also kills the buffer in that window. +With 'M-0', deletes the selected window and selects the window +that was in the specified direction. + +*** New command 'windmove-swap-states-in-direction' binds default keys +to the commands that swap the states of the selected window with the +window in the specified direction. + +** Octave mode +The mode is automatically enabled in files that start with the +'function' keyword. + +** project.el +*** New commands 'project-search' and 'project-query-replace-regexp'. + +** Etags + ++++ +*** 'next-file' is now an obsolete alias of 'tags-next-file'. + +*** 'tags-loop-revert-buffers' is an obsolete alias of +'fileloop-revert-buffers'. + +*** The 'tags-loop-continue' function along with the +'tags-loop-operate' and 'tags-loop-scan' variables are now obsolete; +use the new 'fileloop-initialize' and 'fileloop-continue' functions +instead. -** Emacs 26.1 comes with Org v9.1.6. -See the file ORG-NEWS for user-visible changes in Org. +** bibtex -** New function 'cl-generic-p'. +--- +*** New commands 'bibtex-next-entry' and 'bibtex-previous-entry'. +In 'bibtex-mode-map', 'forward-paragraph' and 'backward-paragraph' are +remapped to these, respectively. ** Dired -*** You can answer 'all' in 'dired-do-delete' to delete recursively all -remaining directories without more prompts. ++++ +*** New command 'dired-create-empty-file'. + +** Change Logs and VC + +*** Recording ChangeLog entries doesn't require an actual file. +If a ChangeLog file doesn't exist, and if the new variable +'add-log-dont-create-changelog-file' is non-nil (which is the +default), commands such as 'C-x 4 a' will add log entries to a +suitable named temporary buffer. (An existing ChangeLog file will +still be used if it exists.) Set the variable to nil to get the +previous behavior of always creating a buffer that visits a ChangeLog +file. + +*** New customizable variable 'vc-find-revision-no-save'. +With non-nil, 'vc-find-revision' doesn't write the created buffer to file. + +*** New customizable variable 'vc-git-grep-template'. +This new variable allows customizing the default arguments passed to +'git-grep' when 'vc-git-grep' is used. + +*** Command 'vc-git-stash' now respects marks in the '*vc-dir*' buffer. +When some files are marked, only those are stashed. +When no files are marked, all modified files are stashed, as before. + +*** The new hook 'vc-retrieve-tag-hook' runs after retrieving a tag. + +--- +*** 'vc-hg' now invokes 'smerge-mode' when visiting files. +Code that attempted to invoke 'smerge-mode' when visiting an Hg file +with conflicts existed in earlier versions of Emacs, but incorrectly +never detected a conflict due to invalid assumptions about cached +values. + ++++ +*** 'C-u C-x v D' ('vc-root-version-diff') prompts for two revisions +and compares their entire trees. + +*** New user option 'vc-hg-revert-switches' specifies switches to pass +to hg revert. + +*** 'C-x v M D' ('vc-diff-mergebase') and 'C-x v M L' ('vc-log-mergebase') +print diffs and logs between the merge base (common ancestor) of two +given revisions. + +** Diff mode ++++ +*** Hunks are now automatically refined by font-lock. +To disable refinement, set the new defcustom 'diff-refine' to nil. +To get back the old behavior where hunks are refined as you navigate +through a diff, set 'diff-refine' to the symbol 'navigate'. ++++ +*** 'diff-auto-refine-mode' is deprecated in favor of 'diff-refine'. +It is no longer enabled by default and binding it no longer has any +effect. + ++++ +*** Better syntax highlighting of Diff hunks. +Fragments of source in Diff hunks are now by default highlighted +according to the appropriate major mode. Customize the new option +'diff-font-lock-syntax' to nil to disable this. + +*** File headers can be shortened, mimicking Magit's diff format. +To enable it, set the new defcustom 'diff-font-lock-prettify' to t. + ++++ +*** Prefix arg of 'diff-goto-source' means jump to the old revision +of the file under version control if point is on an old changed line, +or to the new revision of the file otherwise. + +** Texinfo + ++++ +*** New function for inserting @pxref, @xref, or @ref commands. +The function 'texinfo-insert-dwim-@ref', bound to 'C-c C-c r' by +default, inserts one of three types of references based on the text +surrounding point, namely @pxref near a parenthesis, @xref at the +start of a sentence or at (point-min), else @ref. + +** Browse-url + +*** The function 'browse-url-emacs' can now visit a URL in selected window. +It now treats the optional 2nd argument to mean that the URL should be +shown in the currently selected window. -*** Dired supports wildcards in the directory part of the file names. +** Comint -*** You can now use '`?`' in 'dired-do-shell-command'. -It gets replaced by the current file name, like ' ? '. ++++ +*** 'send-invisible' is now an obsolete alias for 'comint-send-invisible'. +Also, 'shell-strip-ctrl-m' is declared obsolete. + ++++ +*** 'C-c .' ('comint-insert-previous-argument') no longer interprets '&'. +This feature caused problems when '&&' was present in the previous +command. Since this command emulates 'M-.' in Bash and zsh, neither +of which treats '&' specially, the feature was removed for +compatibility with these shells. + ++++ +*** 'comint-insert-previous-argument' can now count arguments from the end. +By default, invoking 'C-c .' with a numeric argument N would copy the +Nth argument, counting from the first one. But if the new option +'comint-insert-previous-argument-from-end' is non-nil, it will copy +the Nth argument counting from the last one. Thus 'C-c .' can now +better emulate 'M-.' in both Bash and zsh, since the former counts +from the beginning of the arguments, while the latter counts from the +end. + +** SQL + +*** SQL Indent Minor Mode + +SQL Mode now supports the ELPA 'sql-indent' package for assisting +sophisticated SQL indenting rules. Note, however, that SQL is not +like other programming languages like C, Java, or Python where code is +sparse and rules for formatting are fairly well established. Instead +SQL is more like COBOL (from which it came) and code tends to be very +dense and line ending decisions driven by syntax and line length +considerations to make readable code. Experienced SQL developers may +prefer to rely upon existing Emacs facilities for formatting code but +the 'sql-indent' package provides facilities to aid more casual SQL +developers layout queries and complex expressions. + +**** 'sql-use-indent-support' (default t) enables SQL indention support. +The 'sql-indent' package from ELPA must be installed to get the +indentation support in 'sql-mode' and 'sql-interactive-mode'. + +**** 'sql-mode-hook' and 'sql-interactive-mode-hook' changed. +Both hook variables have had 'sql-indent-enable' added to their +default values. If you have existing customizations to these variables, +you should make sure that the new default entry is included. + +*** Connection Wallet + +Database passwords can now by stored in NETRC or JSON data files that +may optionally be encrypted. When establishing an interactive session +with the database via 'sql-connect' or a product specific function, +like 'sql-mysql' or 'my-postgres', the password wallet will be +searched for the password. The 'sql-product', 'sql-server', +'sql-database', and the 'sql-username' will be used to identify the +appropriate authorization. This eliminates the discouraged practice of +embedding database passwords in your Emacs initialization. + +See the `auth-source' module for complete documentation on the file +formats. By default, the wallet file is expected to be in the +`user-emacs-directory', named 'sql-wallet' or '.sql-wallet', with +'.json' (JSON) or no (NETRC) suffix. Both file formats can optionally +be encrypted with GPG by adding an additional '.gpg' suffix. -*** A new option 'dired-always-read-filesystem' defaulting to nil. -If non-nil, buffers visiting files are reverted before they are -searched; for instance, in 'dired-mark-files-containing-regexp' a -non-nil value of this option means the file is revisited in a -temporary buffer; this temporary buffer is the actual buffer searched: -the original buffer visiting the file is not modified. +** Term -*** Users can now customize mouse clicks in Dired in a more flexible way. -The new command 'dired-mouse-find-file' can be bound to a mouse click -and used to visit files/directories in Dired in the selected window. -The new command 'dired-mouse-find-file-other-frame' similarly visits -files/directories in another frame. You can write your own commands -that invoke 'dired-mouse-find-file' with non-default optional -arguments, to tailor the effects of mouse clicks on file names in -Dired buffers. +--- +*** 'term-read-noecho' is now obsolete, use 'read-passwd' instead. -*** In wdired, when editing files to contain slash characters, -the resulting directories are automatically created. Whether to do -this is controlled by the 'wdired-create-parent-directories' variable. +** Flymake -*** 'W' is now bound to 'browse-url-of-dired-file', and is useful for -viewing HTML files and the like. ++++ +*** The variable 'flymake-diagnostic-types-alist' is obsolete. +You should instead set properties on known diagnostic symbols, like +':error' and ':warning', as demonstrated in the Flymake manual. -*** New variable 'dired-clean-confirm-killing-deleted-buffers' -controls whether Dired asks to kill buffers visiting deleted files and -directories. The default is t, so Dired asks for confirmation, to -keep previous behavior. +*** New customizable variable 'flymake-start-on-save-buffer'. +Control whether Flymake starts checking the buffer on save. -** html2text is now marked obsolete. +*** Flymake and backend functions may exchange hints about buffer changes. +This enables more efficient backends. See the docstring of +'flymake-diagnostic-functions' or the Flymake manual for details. -** smerge-refine-regions can refine regions in separate buffers. +** Ruby -** Info menu and index completion uses substring completion by default. -This can be customized via the 'info-menu' category in -'completion-category-overrides'. +*** The Rubocop Flymake diagnostic function will only run Lint cops if +it can't find the config file. -** The ancestor buffer is shown by default in 3-way merges. -A new option 'ediff-show-ancestor' and a new toggle -'ediff-toggle-show-ancestor'. +*** Rubocop is called with 'bundle exec' if Gemfile mentions it. -** TeX: Add luatex and xetex as alternatives to pdftex. +** Package -** Electric-Buffer-menu +*** New function 'package-get-version' lets packages query their own version. +Example use in auctex.el: '(defconst auctex-version (package-get-version))' -*** Key 'U' is bound to 'Buffer-menu-unmark-all' and key 'M-DEL' is -bound to 'Buffer-menu-unmark-all-buffers'. +*** New 'package-quickstart' feature. +When 'package-quickstart' is non-nil, package.el precomputes a big autoloads +file so that activation of packages can be done much faster, which can speed up +your startup significantly. +It also causes variables like 'package-user-dir' and 'package-load-list' to be +consulted when 'package-quickstart-refresh' is run rather than at startup so +you don't need to set them in your early init file. -** hideshow mode got four key bindings that are analogous to outline -mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e'. +*** New function 'package-activate-all'. -** bs +** Info -*** Two new commands 'bs-unmark-all', bound to 'U', and -'bs-unmark-previous', bound to <backspace>. +--- +*** Info can now follow 'file://' protocol URLs. +The 'file://' URLs in Info documents can now be followed by passing +them to the 'browse-url' function, like the other protocols: ftp, +http, and https. This allows to have references to local HTML files, +for example. -** Buffer-menu +** Xref -*** Two new commands 'Buffer-menu-unmark-all', bound to 'U' and -'Buffer-menu-unmark-all-buffers', bound to 'M-DEL'. ++++ +*** New command 'xref-find-definitions-at-mouse'. +This command finds definitions of the identifier at the place of a +mouse click event, and is intended to be bound to a mouse event. -** Checkdoc ++++ +*** Changing 'xref-marker-ring-length' works after 'xref.el' is loaded. +Previously, setting 'xref-marker-ring-length' would only take effect +if set before 'xref.el' was loaded. -*** 'checkdoc-arguments-in-order-flag' now defaults to nil. +--- +*** xref-find-definitions now sets the mark at the buffer position +where it was invoked -** Gnus +** Ecomplete -*** The ~/.newsrc file will now only be saved if the native select -method is an NNTP select method. +*** The ecomplete sorting has changed to a decay-based algorithm. +This can be controlled by the new 'ecomplete-sort-predicate' variable. -*** A new command for sorting articles by readedness marks has been -added: 'C-c C-s C-m C-m'. +*** The 'ecompleterc' file is now placed in ~/.emacs.d/ecompleterc by default. +Of course it will still find it if you have it in ~/.ecompleterc -*** In 'message-citation-line-format' the '%Z' format is now the time -zone name instead of the numeric form. The '%z' format continues to -be the numeric form. The new behavior is compatible with -'format-time-string'. +** Gnus -** Ibuffer +--- +*** Gnus now maps imaps to 993 only on old MS-Windows versions. +The nnimap backend used to do this unconditionally to work around +problems on old versions of MS-Windows. This is now done only for +Windows XP and older. -*** New command 'ibuffer-jump'. ++++ +*** The nnimap backend now has support for IMAP namespaces. +This feature can be enabled by setting the new 'nnimap-use-namespaces' +server variable to non-nil. -*** New filter commands 'ibuffer-filter-by-basename', -'ibuffer-filter-by-file-extension', 'ibuffer-filter-by-directory', -'ibuffer-filter-by-starred-name', 'ibuffer-filter-by-modified' -and 'ibuffer-filter-by-visiting-file'; bound respectively -to '/b', '/.', '//', '/*', '/i' and '/v'. ++++ +*** A prefix argument to 'gnus-summary-limit-to-score' will limit reverse. +Limit to articles with score at below. -*** Two new commands 'ibuffer-filter-chosen-by-completion' -and 'ibuffer-and-filter', the second bound to '/&'. +*** The function 'gnus-score-find-favorite-words' has been renamed +from 'gnus-score-find-favourite-words'. -*** The commands 'ibuffer-pop-filter', 'ibuffer-pop-filter-group', -'ibuffer-or-filter' and 'ibuffer-filter-disable' have the alternative -bindings '/<up>', '/S-<up>', '/|' and '/DEL', respectively. +--- +*** Gmane has been removed as an nnir backend, since Gmane no longer +has a search engine. -*** The data format specifying filters has been extended to allow -explicit logical 'and', and a more flexible form for logical 'not'. -See 'ibuffer-filtering-qualifiers' doc string for full details. ++++ +*** Splitting mail on common mailing list headers has been added. +See the concept index in the Gnus manual for the 'match-list' entry. -*** A new command 'ibuffer-copy-buffername-as-kill'; bound -to 'B'. ++++ +*** nil is no longer an allowed value for 'mm-text-html-renderer'. -*** New command 'ibuffer-change-marks'; bound to '* c'. ++++ +*** A new Gnus summary mode command, 'S A' +('gnus-summary-attach-article') can be used to attach the current +article(s) to a pre-existing Message buffer, or create a new Message +buffer with the article(s) attached. -*** A new command 'ibuffer-mark-by-locked' to mark -all locked buffers; bound to '% L'. +--- +*** New option 'nnir-notmuch-filter-group-names-function'. +This option controls whether and how to use Gnus search groups as +'path:' search terms to 'notmuch'. -*** A new option 'ibuffer-locked-char' to indicate -locked buffers; Ibuffer shows a new column displaying -'ibuffer-locked-char' for locked buffers. +** erc -*** A new command 'ibuffer-unmark-all-marks' to unmark -all buffers without asking confirmation; bound to -'U'; 'ibuffer-do-replace-regexp' bound to 'r'. +--- +*** 'erc-button-google-url' has been renamed 'erc-button-search-url' +and its value has been changed to Duck Duck Go. -*** A new command 'ibuffer-mark-by-content-regexp' to mark buffers -whose content matches a regexp; bound to '% g'. +** EUDC -*** Two new options 'ibuffer-never-search-content-name' and -'ibuffer-never-search-content-mode' used by -'ibuffer-mark-by-content-regexp'. +*** XEmacs support has been removed. -** Browse-URL +** eww/shr -*** Support for opening links to man pages in Man or WoMan mode. ++++ +*** The 'eww' command can now create a new EWW buffer. +Invoking the command with a prefix argument will cause it to create a +new EWW buffer for the URL instead of reusing the default one. -** Comint ++++ +*** The 'd' ('eww-download') command now falls back to current page's URL. +If this command is invoked with no URL at point, it now downloads the +current page instead of signaling an error. -*** New user option 'comint-move-point-for-matching-input' to control -where to place point after 'C-c M-r' and 'C-c M-s'. +*** When opening external links in eww/shr (typically with the +'C-u RET' keystroke on a link), the link will be flashed with the new +'shr-selected-link' face to give the user feedback that the command +has been executed. -*** New user option 'comint-terminfo-terminal'. -This option allows control of the value of the TERM environment -variable Emacs puts into the environment of the Comint mode and its -derivatives, such as Shell mode and Compilation Shell minor-mode. The -default is "dumb", for compatibility with previous behavior. ++++ +*** New option 'shr-discard-aria-hidden'. +If set, shr will not render tags with attribute 'aria-hidden="true"'. +This attribute is meant to tell screen readers to ignore a tag. -** Compilation mode +--- +*** 'shr-tag-ol' now respects the ordered list 'start' attribute. -*** Messages from CMake are now recognized. +** Htmlfontify -*** The number of errors, warnings, and informational messages is now -displayed in the mode line. These are updated as compilation -proceeds. +*** The functions 'hfy-color', 'hfy-color-vals' and +'hfy-fallback-color-values' and the variables 'hfy-fallback-color-map' +and 'hfy-rgb-txt-color-map' have been renamed from names that used +'colour' instead of 'color'. -** Grep ++++ +** Enriched mode supports the 'charset' text property. +You can add or modify the 'charset' text properties of text using the +'Edit->Text Properties->Special Properties' menu, or by invoking the +'facemenu-set-charset' command. Documents in Enriched mode will be +saved with the charset properties, and those properties will be +restored when the file is visited. -*** Grep commands will now use GNU grep's '--null' option if -available, which allows distinguishing the filename from contents if -they contain colons. This can be controlled by the new custom option -'grep-use-null-filename-separator'. +** Smtpmail -*** The grep/rgrep/lgrep functions will now ask about saving files -before running. This is controlled by the 'grep-save-buffers' -variable. +Authentication mechanisms can be added via external packages, by +defining new 'cl-defmethod' of 'smtpmail-try-auth-method'. -** Edebug +** Footnote mode -*** Edebug can be prevented from pausing 1 second after reaching a -breakpoint (e.g. with "f" and "o") by customizing the new option -'edebug-sit-on-break'. +*** Support Hebrew-style footnotes +*** Footnote text lines are now aligned. +Can be controlled via the new variable 'footnote-align-to-fn-text'. -*** New customizable option 'edebug-max-depth'. -This allows you to enlarge the maximum recursion depth when -instrumenting code. +** CSS mode -*** 'edebug-prin1-to-string' now aliases 'cl-prin1-to-string'. -This means edebug output is affected by variables 'cl-print-readably' -and 'cl-print-compiled'. To completely restore the previous printing -behavior, use +--- +*** A new command 'css-cycle-color-format' for cycling between color +formats (e.g. "black" => "#000000" => "rgb(0, 0, 0)") has been added, +bound to 'C-c C-f'. - (fset 'edebug-prin1-to-string #'prin1-to-string) +--- +*** CSS mode, SCSS mode, and Less CSS mode now have support for Imenu. -** Eshell +** SGML mode -*** 'eshell-input-filter's value is now a named function -'eshell-input-filter-default', and has a new custom option -'eshell-input-filter-initial-space' to ignore adding commands prefixed -with blank space to eshell history. +--- +*** 'sgml-quote' now handles double quotes and apostrophes +when escaping text and in addition all numeric entities when +unescaping text. -** EUDC +** Python mode -*** Backward compatibility support for BBDB versions less than 3 -(i.e., BBDB 2.x) is deprecated and will likely be removed in the next -major release of Emacs. Users of BBDB 2.x should plan to upgrade to -BBDB 3.x. +--- +*** Python mode supports three different font lock decoration levels. +The maximum level is used by default; customize +'font-lock-maximum-decoration' to tone down the decoration. -** eww - -*** New 'M-RET' command for opening a link at point in a new eww buffer. - -*** A new 's' command for switching to another eww buffer via the minibuffer. +** Dired -*** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision -with the 'o' command from 'image-map'. ++++ +*** The new user option 'dired-create-destination-dirs' controls whether +'dired-do-copy' and 'dired-rename-file' should create non-existent +directories in the destination. -*** A new command 'C' ('eww-toggle-colors') can be used to toggle -whether to use the HTML-specified colors or not. The user can also -customize the 'shr-use-colors' variable. +** Help -*** Images that are being loaded are now marked with gray -"placeholder" images of the size specified by the HTML. They are then -replaced by the real images asynchronously, which will also now -respect width/height HTML specs (unless they specify widths/heights -bigger than the current window). +--- +*** Output format of 'C-h l' ('view-lossage') has changed. +For convenience, 'view-lossage' now displays the last keystrokes +and commands in the same format as the edit buffer of +'edit-last-kbd-macro'. This makes it possible to copy the lines from +the buffer generated by 'view-lossage' to the "*Edit Macro*" buffer +created by 'edit-last-kbd-macro', and to save the macro by 'C-c C-c'. -*** The 'w' command on links is now 'shr-maybe-probe-and-copy-url'. -'shr-copy-url' now only copies the url at point; users who wish to -avoid accidentally accessing remote links may rebind 'w' and 'u' in -'eww-link-keymap' to it. +--- +*** The list of help commands produced by 'C-h C-h' ('help-for-help') +can now be searched via 'C-s'. -** Ido +** Ibuffer -*** The commands 'find-alternate-file-other-window', -'dired-other-window', 'dired-other-frame', and -'display-buffer-other-window' are now remapped to Ido equivalents if -Ido mode is active. +--- +*** New filter 'ibuffer-filter-by-process'; bound to '/E'. + +--- +*** All mode filters can now accept a list of symbols. +This means you can now easily filter several major modes, as well +as a single mode. + +** Search and Replace + +*** Isearch supports a prefix argument for 'C-s' ('isearch-repeat-forward') +and 'C-r' ('isearch-repeat-backward'). With a prefix argument, these +commands repeat the search for the specified occurrence of the search string. +A negative argument repeats the search in the opposite direction. +This makes possible also to use a prefix argument for 'M-s .' +('isearch-forward-symbol-at-point') to find the next Nth symbol. + +*** To go to the first/last occurrence of the current search string +is possible now with new commands 'isearch-beginning-of-buffer' and +'isearch-end-of-buffer' bound to 'M-s M-<' and 'M-s M->' in Isearch. +With a numeric argument, they go to the Nth absolute occurrence +counting from the beginning/end of the buffer. This complements +'C-s'/'C-r' that searches for the next Nth relative occurrence +with a numeric argument. + +*** 'isearch-lazy-count' shows the current match number and total number +of matches in the Isearch prompt. Customizable variables +'lazy-count-prefix-format' and 'lazy-count-suffix-format' define the +format of the current and the total number of matches in the prompt's +prefix and suffix respectively. + +*** 'lazy-highlight-buffer' highlights matches in the full buffer. +It is useful in combination with 'lazy-highlight-cleanup' customized to nil +to leave matches highlighted in the whole buffer after exiting isearch. +Also when 'lazy-highlight-buffer' prepares highlighting in the buffer, +navigation through the matches without flickering is more smooth. +'lazy-highlight-buffer-max-at-a-time' controls the number of matches to +highlight in one iteration while processing the full buffer. + ++++ +*** New isearch bindings. + +'C-M-w' in isearch changed from 'isearch-del-char' to the new function +'isearch-yank-symbol-or-char'. 'isearch-del-char' is now bound to +'C-M-d'. + ++++ +*** New variable 'isearch-yank-on-move' provides options 't' and 'shift' +to extend the search string by yanking text that ends at the new +position after moving point in the current buffer. 'shift' extends +the search string by motion commands while holding down the shift key. + +*** 'isearch-allow-scroll' provides new option 'unlimited' to allow +scrolling any distance off screen. + +--- +*** Isearch now remembers the regexp-based search mode for words/symbols +and case-sensitivity together with search strings in the search ring. + +--- +*** Isearch now has its own tool-bar and menu-bar menu. + ++++ +*** flush-lines prints and returns the number of deleted matching lines. + +** Debugger + ++++ +*** The Lisp Debugger is now based on 'backtrace-mode'. +Backtrace mode adds fontification and commands for changing the +appearance of backtrace frames. See the node "(elisp) Backtraces" in +the Elisp manual for documentation of the new mode and its commands. -** Images +** Edebug -*** Images are automatically scaled before displaying based on the -'image-scaling-factor' variable (if Emacs supports scaling the images -in question). ++++ +*** The runtime behavior of Edebug's instrumentation can be changed +using the new variables 'edebug-behavior-alist', +'edebug-after-instrumentation-function' and +'edebug-new-definition-function'. Edebug's behavior can be changed +globally or for individual definitions. -*** It's now possible to specify aspect-ratio preserving combinations -of :width/:max-height and :height/:max-width keywords. In either -case, the "max" keywords win. (Previously some combinations would, -depending on the aspect ratio of the image, just be ignored and in -other instances this would lead to the aspect ratio not being -preserved.) ++++ +*** Edebug's backtrace buffer now uses 'backtrace-mode'. +Backtrace mode adds fontification, links and commands for changing the +appearance of backtrace frames. See the node "(elisp) Backtraces" in +the Elisp manual for documentation of the new mode and its commands. -*** Images inserted with 'insert-image' and related functions get a -keymap put into the text properties (or overlays) that span the -image. This keymap binds keystrokes for manipulating size and -rotation, as well as saving the image to a file. These commands are -also available in 'image-mode'. +The binding of 'd' in Edebug's keymap is now 'edebug-pop-to-backtrace' +which replaces 'edebug-backtrace'. Consequently Edebug's backtrace +windows now behave like those of the Lisp Debugger and of ERT, in that +when they appear they will be the selected window. -*** A new library for creating and manipulating SVG images has been -added. See the "(elisp) SVG Images" section in the ELisp reference -manual for details. +The new 'backtrace-goto-source' command, bound to 's', works in +Edebug's backtraces on backtrace frames whose source code has +been instrumented by Edebug. -*** New setf-able function to access and set image parameters is -provided: 'image-property'. +** Enhanced xterm support -*** New commands 'image-scroll-left' and 'image-scroll-right' -for 'image-mode' that complement 'image-scroll-up' and -'image-scroll-down': they have the same prefix arg behavior and stop -at image boundaries. +*** New variable 'xterm-set-window-title' controls whether Emacs sets +the XTerm window title. This feature is experimental and is disabled +by default. -** Image-Dired +** Grep -*** Now provides a minor mode 'image-dired-minor-mode' which replaces -the function 'image-dired-setup-dired-keybindings'. ++++ +*** rgrep, lgrep and zrgrep now hide part of the command line +that contains a list of ignored directories and files. +Clicking on the button with ellipsis unhides it. +The abbreviation can be disabled by the new option +'grep-find-abbreviate'. The new command +'grep-find-toggle-abbreviation' toggles it interactively. -*** Thumbnail generation is now asynchronous. -The number of concurrent processes is limited by the variable -'image-dired-queue-active-limit'. +** ERT -*** 'image-dired-thumbnail-storage' has a new option 'standard-large' -for generating 256x256 thumbnails according to the Thumbnail Managing -Standard. ++++ +*** New variable 'ert-quiet' allows to make ERT output in batch mode +less verbose by removing non-essential information. -*** Inherits movement keys from 'image-mode' for viewing full images. -This includes the usual char, line, and page movement commands. ++++ +*** ERT's backtrace buffer now uses 'backtrace-mode'. +Backtrace mode adds fontification and commands for changing the +appearance of backtrace frames. See the node "(elisp) Backtraces" in +the Elisp manual for documentation of the new mode and its commands. -*** All the -options types have been changed to argument lists -instead of shell command strings. This change affects -'image-dired-cmd-create-thumbnail-options', -'image-dired-cmd-create-temp-image-options', -'image-dired-cmd-rotate-thumbnail-options', -'image-dired-cmd-rotate-original-options', -'image-dired-cmd-write-exif-data-options', -'image-dired-cmd-read-exif-data-options', and introduces -'image-dired-cmd-pngnq-options', 'image-dired-cmd-pngcrush-options', -'image-dired-cmd-create-standard-thumbnail-options'. +** Gamegrid -*** Recognizes more tools by default, including pngnq-s9 and OptiPNG. +--- +*** Gamegrid now determines its default glyph size based on display +dimensions, instead of always using 16 pixels. As a result, Tetris, +Snake and Pong are more playable on HiDPI displays. -*** 'find-file' and related commands now work on thumbnails and -displayed images, providing a default argument of the original file name -via an addition to 'file-name-at-point-functions'. +** Filecache -** The default 'Info-default-directory-list' no longer checks some obsolete -directory suffixes (gnu, gnu/lib, gnu/lib/emacs, emacs, lib, lib/emacs) -when searching for info directories. +--- +*** Completing filenames in the minibuffer via 'C-TAB' now uses the +styles as configured by the variable 'completion-styles'. -** The commands that add ChangeLog entries now prefer a VCS root directory -for the ChangeLog file, if none already exists. Customize -'change-log-directory-files' to nil for the old behavior. +** New macros 'thunk-let' and 'thunk-let*'. +These macros are analogue to 'let' and 'let*', but create bindings that +are evaluated lazily. -** Support for non-string values of 'time-stamp-format' has been removed. +** next-error -** Message ++++ +*** New customizable variable 'next-error-find-buffer-function'. +The value should be a function that determines how to find the +next buffer to be used by 'next-error' and 'previous-error'. The +default is to use the last buffer that navigated to the current +error. -*** 'message-use-idna' now defaults to t (because Emacs comes with -built-in IDNA support now). ++++ +*** New command 'next-error-select-buffer'. +It can be used to set any buffer as the next one to be used by +'next-error' and 'previous-error'. -*** When sending HTML messages with embedded images, and you have -exiftool installed, and you rotate images with EXIF data (i.e., -JPEGs), the rotational information will be inserted into the outgoing -image in the message. (The original image will not have its -orientation affected.) +** nxml-mode -*** The 'message-valid-fqdn-regexp' variable has been removed, since -there are now top-level domains added all the time. Message will no -longer warn about sending emails to top-level domains it hasn't heard -about. +--- +*** The default value of 'nxml-sexp-element-flag' is now t. +This means that pressing 'C-M-SPACE' now selects the entire tree by +default, and not just the opening element. -*** 'message-beginning-of-line' (bound to 'C-a') understands folded headers. -In 'visual-line-mode' it will look for the true beginning of a header -while in non-'visual-line-mode' it will move the point to the indented -header's value. +** Eshell -** Package +*** TAB completion uses the standard completion-at-point rather than pcomplete +Its UI is slightly different but can be customized to behave similarly, +e.g. Pcomplete's default cycling can be obtained with +(setq completion-cycle-threshold 5). -*** The new variable 'package-gnupghome-dir' has been added to control -where the GnuPG home directory (used for signature verification) is -located and whether GnuPG's option '--homedir' is used or not. +--- +*** Expansion of history event designators is disabled by default. +To restore the old behavior, use -*** Deleting a package no longer respects 'delete-by-moving-to-trash'. + (add-hook 'eshell-expand-input-functions + #'eshell-expand-history-references) -** Python +--- +*** The function 'eshell-uniquify-list' has been renamed from +'eshell-uniqify-list'. -*** The new variable 'python-indent-def-block-scale' has been added. -It controls the depth of indentation of arguments inside multi-line -function signatures. +*** The function 'eshell/kill' is now able to handle signal switches. +Previously 'eshell/kill' would fail if provided a kill signal to send +to the process. It now accepts signals specified either by name or by +its number. -** Tramp +--- +*** Emacs now follows symlinks in history-related files. +The files specified by 'eshell-history-file-name' and +'eshell-last-dir-ring-file-name' can include symlinks; these are now +followed when Emacs writes the relevant history variables to the disk. -*** The method part of remote file names is mandatory now. -A valid remote file name starts with "/method:host:" or -"/method:user@host:". +** Shell -*** The new pseudo method "-" is a marker for the default method. -"/-::" is the shortest remote file name then. +--- +*** Program name completion inside remote shells works now as expected. -*** The command 'tramp-change-syntax' allows you to choose an -alternative remote file name syntax. ++++ +*** The variable 'shell-file-name' can be set now as connection-local +variable for remote shells. It still defaults to "/bin/sh". -*** New connection method "sg", which supports editing files under a -different group ID. +** Pcomplete -*** New connection method "doas" for OpenBSD hosts. +*** The function 'pcomplete-uniquify-list' has been renamed from +'pcomplete-uniqify-list'. -*** New connection method "gdrive", which allows access to Google -Drive onsite repositories. +** Auth-source -*** Gateway methods in Tramp have been removed. -Instead, the Tramp manual documents how to configure ssh and PuTTY -accordingly. +--- +*** The Secret Service backend supports the ':create' key now. -*** Setting the "ENV" environment variable in -'tramp-remote-process-environment' enables reading of shell -initialization files. +** Tramp -*** Tramp is able now to send SIGINT to remote asynchronous processes. ++++ +*** New connection method "nextcloud", which allows to access OwnCloud +or NextCloud hosted files and directories. -*** Variable 'tramp-completion-mode' is obsoleted. ++++ +*** New connection method "rclone", which allows to access system +storages via the 'rclone' program. This feature is experimental. -** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'. ++++ +*** New connection method "sudoedit", which allows to edit local files +with different user credentials. Contrary to the "sudo" method, no +session is run permanently in the background. This is for security +reasons. -** JS mode ++++ +*** Connection methods "obex" and "synce" are removed, because they +are obsoleted in GVFS. -*** JS mode now sets 'comment-multi-line' to t. ++++ +*** Validated passwords are saved by auth-source backends which support this. -*** New variable 'js-indent-align-list-continuation', when set to nil, -will not align continuations of bracketed lists, but will indent them -by the fixed width 'js-indent-level'. ++++ +*** During user and host name completion in the minibuffer, results +from auth-source search are taken into account. This can be disabled +by setting the user option 'tramp-completion-use-auth-sources' to nil. -** CSS mode ++++ +*** The user option 'tramp-ignored-file-name-regexp' allows to disable +Tramp for some look-alike remote file names. -*** Support for completing attribute values, at-rules, bang-rules, -HTML tags, classes and IDs using the 'completion-at-point' command. -Completion candidates for HTML classes and IDs are retrieved from open -HTML mode buffers. ++++ +*** For some connection methods, like "su" or "sudo", the host name in +ad-hoc multi-hop file names must match the previous hop. Default host +names are adjusted to the host name from the previous hop. -*** CSS mode now binds 'C-h S' to a function that will show -information about a CSS construct (an at-rule, property, pseudo-class, -pseudo-element, with the default being guessed from context). By -default the information is looked up on the Mozilla Developer Network, -but this can be customized using 'css-lookup-url-format'. ++++ +*** For the connection methods "sudo" and "doas" there exists a +timeout, after which the underlying session is disabled. This is for +security reasons. -*** CSS colors are fontified using the color they represent as the -background. For instance, #ff0000 would be fontified with a red -background. +** Rcirc -** Emacs now supports character name escape sequences in character and -string literals. The syntax variants '\N{character name}' and -'\N{U+code}' are supported. +--- +*** New user option 'rcirc-url-max-length'. +Setting this option to an integer causes URLs displayed in Rcirc +buffers to be truncated to that many characters. -** Prog mode has some support for multi-mode indentation. -This allows better indentation support in modes that support multiple -programming languages in the same buffer, like literate programming -environments or ANTLR programs with embedded Python code. +** Register +--- +*** The return value of method 'register-val-describe' includes the +names of buffers shown by the windows of a window configuration. -A major mode can provide indentation context for a sub-mode. To -support this, modes should use 'prog-first-column' instead of a -literal zero and avoid calling 'widen' in their indentation functions. -See the node "(elisp) Mode-Specific Indent" in the ELisp manual for -more details. +--- +** The options.el library has been removed. +It was obsolete since Emacs 22.1, replaced by customize. -** ERC +** The tls.el and starttls.el libraries are now marked obsolete. +Use of built-in libgnutls based functionality (described in the Emacs +GnuTLS manual) is recommended instead. -*** New variable 'erc-default-port-tls' used to connect to TLS IRC -servers. +** Message -** URL ++++ +*** Messages can now be systematically encrypted +when the PGP keyring contains a public key for every recipient. To +achieve this, add 'message-sign-encrypt-if-all-keys-available' to +'message-send-hook'. -*** The new function 'url-cookie-delete-cookie' can be used to -programmatically delete all cookies, or cookies from a specific -domain. +--- +*** When replying a message that have addresses on the form +'"foo@bar.com" <foo@bar.com>', Message will elide the repeated "name" +from the address field in the response. -*** 'url-retrieve-synchronously' now takes an optional timeout parameter. +--- +*** The default of 'message-forward-as-mime' has changed from t to nil +as it has been reported that many recipients can't read forwards that +are formatted as MIME digests. -*** The URL package now supports HTTPS over proxies supporting CONNECT. ++++ +*** 'message-forward-included-headers' has changed its default to +exclude most headers when forwarding. + +** EasyPG -*** 'url-user-agent' now defaults to 'default', and the User-Agent -string is computed dynamically based on 'url-privacy-level'. +--- +*** 'epa-pinentry-mode' is renamed to 'epg-pinentry-mode'. +It now applies to epg functions as well as epa functions. -** VC and related modes +--- +*** The alias functions 'epa--encode-coding-string', +'epa--decode-coding-string', and 'epa--select-safe-coding-system' have +been removed. Use 'encode-coding-string', 'decode-coding-string', and +'select-safe-coding-system' instead. -*** 'vc-dir-mode' now binds 'vc-log-outgoing' to 'O'; and has various -branch-related commands on a keymap bound to 'B'. +** Rmail -*** 'vc-region-history' is now bound to 'C-x v h', replacing the older -'vc-insert-headers' binding. ++++ +*** New user option 'rmail-output-reset-deleted-flag'. +If this option is non-nil, messages appended to an output file by the +'rmail-output' command have their Deleted flag reset. -*** New user option 'vc-git-print-log-follow' to follow renames in Git logs -for a single file. +*** The command 'rmail-summary-by-senders' with an empty argument +selects the messages to summarize with a regexp that matches the +sender of the current message. -** CC mode +** Threads -*** Opening a .h file will turn C or C++ mode depending on language used. -This is done with the help of the 'c-or-c++-mode' function, which -analyzes buffer contents to infer whether it's a C or C++ source file. ++++ +*** New variable 'main-thread' holds Emacs's main thread. +This is handy in Lisp programs that run on a non-main thread and want +to signal the main thread, e.g., when they encounter an error. -** New option 'cpp-message-min-time-interval' to allow user control -of progress messages in cpp.el. ++++ +*** 'thread-join' returns the result of the finished thread now. -** New DNS mode command 'dns-mode-ipv6-to-nibbles' to convert IPv6 addresses -to a format suitable for reverse lookup zone files. ++++ +*** 'thread-signal' does not propagate errors to the main thread. +Instead, error messages are just printed in the main thread. -** Ispell +--- +*** 'thread-alive-p' is now obsolete, use 'thread-live-p' instead. -*** Enchant is now supported as a spell-checker. -Enchant is a meta-spell-checker that uses providers such as Hunspell -to do the actual checking. With it, users can use spell-checkers not -directly supported by Emacs, such as Voikko, Hspell and AppleSpell, -more easily share personal word-lists with other programs, and -configure different spelling-checkers for different languages. -(Version 2.1.0 or later of Enchant is required.) ++++ +*** New command 'list-threads' shows Lisp threads. +See the current list of live threads in a tabulated-list buffer which +automatically updates. In the buffer, you can use 's q' or 's e' to +signal a thread with quit or error respectively, or get a snapshot +backtrace with 'b'. -** Flymake +--- +** thingatpt.el supports a new "thing" called 'uuid'. +A symbol 'uuid' can be passed to 'thing-at-point' and it returns the +UUID at point. -*** Flymake has been completely redesigned. -Flymake now annotates arbitrary buffer regions, not just lines. It -supports arbitrary diagnostic types, not just errors and warnings (see -variable 'flymake-diagnostic-types-alist'). +** Interactive automatic highlighting -It also supports multiple simultaneous backends, meaning that you can -check your buffer from different perspectives (see variable -'flymake-diagnostic-functions'). Backends for Emacs Lisp mode are -provided. ++++ +*** 'highlight-regexp' can now highlight subexpressions. +The new command accepts a prefix numeric argument to choose the +subexpression. -The old Flymake behavior is preserved in the so-called "legacy -backend", which has been updated to benefit from the new UI features. +** Mouse display of minor mode menu -** Term +--- +*** 'minor-mode-menu-from-indicator' now displays full minor mode name. +When there is no menu for a mode, display the mode name after the +indicator instead of just the indicator (which is sometimes cryptic). -*** 'term-char-mode' now makes its buffer read-only. -The buffer is made read-only to prevent changes from being made by -anything other than the process filter; and movements of point away -from the process mark are counter-acted so that the cursor is in the -correct position after each command. This is needed to avoid states -which are inconsistent with the state of the terminal understood by -the inferior process. +** rx -New user options 'term-char-mode-buffer-read-only' and -'term-char-mode-point-at-process-mark' control these behaviors, and -are non-nil by default. Customize these options to nil if you want -the previous behavior. +--- +*** rx now handles raw bytes in character alternatives correctly, +when given in a string. Previously, '(any "\x80-\xff")' would match +characters U+0080...U+00FF. Now the expression matches raw bytes in +the 128...255 range, as expected. -** Xref +** Frames -*** When an *xref* buffer is needed, 'TAB' quits and jumps to an xref. -A new command 'xref-quit-and-goto-xref', bound to 'TAB' in *xref* -buffers, quits the window before jumping to the destination. In many -situations, the intended window configuration is restored, just as if -the *xref* buffer hadn't been necessary in the first place. ++++ +*** New command 'make-frame-on-monitor' makes a frame on the specified monitor. - -* New Modes and Packages in Emacs 26.1 ++++ +*** New value of 'minibuffer' frame parameter 'child-frame'. +This allows to create and parent immediately a minibuffer-only child +frame when making a frame. -** New Elisp data-structure library 'radix-tree'. +--- +*** New predicates 'display-blink-cursor-p' and 'display-symbol-keys-p'. +These predicates are to be preferred over 'display-graphic-p' when +testing for blinking cursor capability and the capability to have +symbols (e.g., [return], [tab], [backspace]) as keys respectively. -** New library 'xdg' with utilities for some XDG standards and specs. +** Tabulated List mode -** HTML ++++ +*** New user options for tabulated list sort indicators. +You can now customize which sorting indicator character to display +near the current column in Tabulated Lists (see variables +'tabulated-list-gui-sort-indicator-asc', +'tabulated-list-gui-sort-indicator-desc', +'tabulated-list-tty-sort-indicator-asc', and +'tabulated-list-tty-sort-indicator-desc'). -*** A new submode of 'html-mode', 'mhtml-mode', is now the default -mode for *.html files. This mode handles indentation, -fontification, and commenting for embedded JavaScript and CSS. +** Text mode -** New mode 'conf-toml-mode' is a sub-mode of 'conf-mode', specialized -for editing TOML files. ++++ +*** 'text-mode-variant' is now obsolete, use 'derived-mode-p' instead. -** New mode 'conf-desktop-mode' is a sub-mode of 'conf-unix-mode', -specialized for editing freedesktop.org desktop entries. +** CUA mode -** New minor mode 'pixel-scroll-mode' provides smooth pixel-level scrolling. +--- +*** New defcustom 'cua-rectangle-terminal-modifier-key'. +This defcustom allows for the customization of the modifier key used +in a terminal frame. -** New major mode 'less-css-mode' (a minor variant of 'css-mode') for -editing Less files. +** JS mode -** New package 'auth-source-pass' integrates 'auth-source' with the -password manager password-store (http://passwordstore.org). +--- +*** JSX syntax is now automatically detected and enabled. +If a file imports Facebook's 'React' library, or if the file uses the +extension '.jsx', then various features supporting XML-like syntax +will be supported in 'js-mode' and derivative modes. ('js-jsx-mode' +no longer needs to be enabled.) + +--- +*** New defcustom 'js-jsx-detect-syntax' disables automatic detection. +This is turned on by default. + +--- +*** New defcustom 'js-jsx-syntax' enables JSX syntax unconditionally. +This is off by default. + +--- +*** New variable 'js-jsx-regexps' controls JSX detection. + +--- +*** JSX syntax is now highlighted like SGML. + +--- +*** JSX code is properly indented in many more scenarios. +Previously, JSX indentation usually only worked when an element was +wrapped in parenthesis (e.g. in a 'return' statement or a function +call). It would also fail in many intricate cases. Now, indentation +should work anywhere without parenthesis; many more intricacies are +supported; and, indentation conventions align more closely with those +of the React developer community (see 'js-jsx-align->-with-<'), +otherwise still adhering to SGML conventions. + +--- +*** New defcustom 'js-jsx-align->-with-<' controls '>' indents. +Commonly in JSX code, a '>' on its own line is indented at the same +level as its opening '<'. This is the new default for JSX. This +behavior is slightly different than that used by SGML in Emacs, where +'>' is indented at the same level as attributes, which was also the +old default for JSX. + +This is turned on by default. To get back the old default indentation +behavior of aligning '>' with attributes, set 'js-jsx-align->-with-<' +to nil. + +--- +*** Indentation uses 'js-indent-level' instead of 'sgml-basic-offset'. +Since JSX is a syntax extension of JavaScript, it makes the most sense +for JSX expressions to be indented the same number of spaces as other +JS expressions. This is a breaking change, but it probably aligns +with how you'd expect this indentation to behave. If you want JSX to +be indented like JS, you won't need to change your config. + +The old behavior can be emulated by controlling JSX indentation +independently of JS, by setting 'js-jsx-indent-level'. + +--- +*** New defcustom 'js-jsx-indent-level' for different JSX indentation. +If you wish to indent JSX by a different number of spaces than JS, set +this variable to the desired number. + +--- +*** New defcustom 'js-jsx-attribute-offset' for JSX attribute indents. + +--- +*** New variable 'js-syntactic-mode-name' controls mode name display. +Previously, the mode name was simply 'JavaScript'. Now, when a syntax +extension like JSX is enabled, the mode name is 'JavaScript[JSX]'. +Set this variable to nil to disable the new behavior. + +--- +*** New function 'js-use-syntactic-mode-name' for deriving modes. +Packages deriving from 'js-mode' with 'define-derived-mode' should +call this function to add enabled syntax extensions to their mode +name, too. -* Incompatible Lisp Changes in Emacs 26.1 - -** 'password-data' is now a hash-table so that 'password-read' can use -any object for the 'key' argument. - -** Command 'dired-mark-extension' now automatically prepends a '.' to the -extension when not present. The new command 'dired-mark-suffix' behaves -similarly but it doesn't prepend a '.'. - -** Certain cond/pcase/cl-case forms are now compiled using a faster jump -table implementation. This uses a new bytecode op 'switch', which -isn't compatible with previous Emacs versions. This functionality can -be disabled by setting 'byte-compile-cond-use-jump-table' to nil. - -** If 'comment-auto-fill-only-comments' is non-nil, 'auto-fill-function' -is now called only if either no comment syntax is defined for the -current buffer or the self-insertion takes place within a comment. - -** The alist 'ucs-names' is now a hash table. - -** 'if-let' and 'when-let' now support binding lists as defined by the -SRFI-2 (Scheme Request for Implementation 2). - -** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term -mode to send the same escape sequences that xterm does. This makes -things like 'forward-word' in readline work. - -** Customizable variable 'query-replace-from-to-separator' -now doesn't propertize the string value of the separator. -Instead, text properties are added by 'query-replace-read-from'. -Additionally, the new nil value restores pre-24.5 behavior -of not providing replacement pairs via the history. - -** Some obsolete functions, variables, and faces have been removed: - -*** 'make-variable-frame-local'. Variables cannot be frame-local any more. - -*** From subr.el: 'window-dot', 'set-window-dot', 'read-input', -'show-buffer', 'eval-current-buffer', 'string-to-int'. - -*** 'icomplete-prospects-length'. - -*** All the default-FOO variables that hold the default value of the -FOO variable. Use 'default-value' and 'setq-default' to access and -change FOO, respectively. The exhaustive list of removed variables is: -'default-mode-line-format', 'default-header-line-format', -'default-line-spacing', 'default-abbrev-mode', 'default-ctl-arrow', -'default-truncate-lines', 'default-left-margin', 'default-tab-width', -'default-case-fold-search', 'default-left-margin-width', -'default-right-margin-width', 'default-left-fringe-width', -'default-right-fringe-width', 'default-fringes-outside-margins', -'default-scroll-bar-width', 'default-vertical-scroll-bar', -'default-indicate-empty-lines', 'default-indicate-buffer-boundaries', -'default-fringe-indicator-alist', 'default-fringe-cursor-alist', -'default-scroll-up-aggressively', 'default-scroll-down-aggressively', -'default-fill-column', 'default-cursor-type', -'default-cursor-in-non-selected-windows', -'default-buffer-file-coding-system', 'default-major-mode', and -'default-enable-multibyte-characters'. - -*** Many variables obsoleted in 22.1 referring to face symbols. - -** The variable 'text-quoting-style' is now a customizable option. -It controls whether to and how to translate ASCII quotes in messages -and help output. Its possible values and their semantics remain -unchanged from Emacs 25. In particular, when this variable's value is -'grave', all quotes in formats are output as-is. - -** Functions like 'check-declare-file' and 'check-declare-directory' -now generate less chatter and more-compact diagnostics. The auxiliary -function 'check-declare-errmsg' has been removed. - -** The regular expression character class '[:blank:]' now matches -Unicode horizontal whitespace as defined in the Unicode Technical -Standard #18. If you only want to match space and tab, use '[ \t]' -instead. - -** 'min' and 'max' no longer round their results. -Formerly, they returned a floating-point value if any argument was -floating-point, which was sometimes numerically incorrect. For -example, on a 64-bit host (max 1e16 10000000000000001) now returns its -second argument instead of its first. - -** The variable 'old-style-backquotes' has been made internal and -renamed to 'lread--old-style-backquotes'. No user code should use -this variable. - -** 'default-file-name-coding-system' now defaults to a coding system -that does not process CRLF. For example, it defaults to 'utf-8-unix' -instead of to 'utf-8'. Before this change, Emacs would sometimes -mishandle file names containing these control characters. - -** 'file-attributes', 'file-symlink-p' and 'make-symbolic-link' no -longer quietly mutate the target of a local symbolic link, so that -Emacs can access and copy them reliably regardless of their contents. -The following changes are involved. - -*** 'file-attributes' and 'file-symlink-p' no longer prepend "/:" to -symbolic links whose targets begin with "/" and contain ":". For -example, if a symbolic link "x" has a target "/y:z:", '(file-symlink-p -"x")' now returns "/y:z:" rather than "/:/y:z:". - -*** 'make-symbolic-link' no longer looks for file name handlers of -target when creating a symbolic link. For example, -'(make-symbolic-link "/y:z:" "x")' now creates a symbolic link to -"/y:z:" instead of failing. - -*** 'make-symbolic-link' removes the remote part of a link target if -target and newname have the same remote part. For example, -'(make-symbolic-link "/x:y:a" "/x:y:b")' creates a link with the -literal string "a"; and '(make-symbolic-link "/x:y:a" "/x:z:b")' -creates a link with the literal string "/x:y:a" instead of failing. - -*** 'make-symbolic-link' now expands a link target with leading "~" -only when the optional third arg is an integer, as when invoked -interactively. For example, '(make-symbolic-link "~y" "x")' now -creates a link with target the literal string "~y"; to get the old -behavior, use '(make-symbolic-link (expand-file-name "~y") "x")'. To -avoid this expansion in interactive use, you can now prefix the link -target with "/:". For example, '(make-symbolic-link "/:~y" "x" 1)' -now creates a link to literal "~y". - -** 'file-truename' returns a quoted file name if the target of a -symbolic link has remote file name syntax. - -** Module functions are now implemented slightly differently; in -particular, the function 'internal--module-call' has been removed. -Code that depends on undocumented internals of the module system might -break. - -** The argument LOCKNAME of 'write-region' is propagated to file name -handlers now. - -** When built against recent versions of GTK+, Emacs always uses -gtk_window_move for moving frames and ignores the value of the -variable 'x-gtk-use-window-move'. The variable is now obsolete. - -** Several functions that create or rename files now treat their -destination argument specially only when it is a directory name, i.e., -when it ends in '/' on GNU and other POSIX-like systems. When the -destination argument D of one of these functions is an existing -directory and the intent is to act on an entry in that directory, D -should now be a directory name. For example, (rename-file "e" "f/") -renames to 'f/e'. Although this formerly happened sometimes even when -D was not a directory name, as in (rename-file "e" "f") where 'f' -happened to be a directory, the old behavior often contradicted the -documentation and had inherent races that led to security holes. A -call like (rename-file C D) that used the old, undocumented behavior -can be written as (rename-file C (file-name-as-directory D)), a -formulation portable to both older and newer versions of Emacs. -Affected functions include 'add-name-to-file', 'copy-directory', -'copy-file', 'format-write-file', 'gnus-copy-file', -'make-symbolic-link', 'rename-file', 'thumbs-rename-images', and -'write-file'. - -** The list returned by 'overlays-at' is now in decreasing priority order. -The documentation of this function always said the order should be -that of decreasing priority, if the 2nd argument of the function is -non-nil, but the code returned the list in the increasing order of -priority instead. Now the code does what the documentation says it -should do. - -** 'format' now avoids allocating a new string in more cases. -'format' was previously documented to return a newly-allocated string, -but this documentation was not correct, as (eq x (format x)) returned -t when x was the empty string. 'format' is no longer documented to -return a newly-allocated string, and the implementation now takes -advantage of the doc change to avoid making copies of strings in -common cases like (format "foo") and (format "%s" "foo"). +* New Modes and Packages in Emacs 27.1 + +** fileloop.el lets one setup multifile operations like search&replace. + ++++ +** Emacs can now visit files in archives as if they were directories. +This feature uses Tramp and works only on systems which support GVFS, +i.e. GNU/Linux, roughly spoken. See the node "(tramp) Archive file +names" in the Tramp manual for full documentation of these facilities. + ++++ +** New library for writing JSONRPC applications (https://jsonrpc.org). +The 'jsonrpc' library enables writing Emacs Lisp applications that +rely on this protocol. Since the protocol is designed to be +transport-agnostic, the library provides an API to implement new +transport strategies as well as a separate API to use them. A +transport implementation for process-based communication, such as is +used by the Language Server Protocol (LSP), is readily available. + ++++ +** Backtrace mode improves viewing of Elisp backtraces. +Backtrace mode adds pretty printing, fontification and ellipsis +expansion to backtrace buffers produced by the Lisp debugger, Edebug +and ERT. See the node "(elisp) Backtraces" in the Elisp manual for +documentation of the new mode and its commands. + +* Incompatible Lisp Changes in Emacs 27.1 + +** In compilation-error-regexp-alist the old undocumented feature where 'line' +could be a function of 2 arguments has been dropped. + +** 'define-fringe-bitmap' is always defined, even when Emacs is built +without any GUI support. + +--- +** Just loading a theme's file no longer activates the theme's settings. +Loading a theme with 'M-x load-theme' still activates the theme, as it +did before. However, loading the theme's file with 'M-x load-file', +or using 'require' or 'load' in a Lisp program, doesn't actually apply +the theme's settings until you either invoke 'M-x enable-theme' or +type 'M-x load-theme'. (In a Lisp program, calling 'enable-theme' or +invoking 'load-theme' with NO-ENABLE argument omitted or nil has the +same effect of activating a theme whose file has been loaded.) The +special case of the 'user' theme is an exception: it is frequently +used for ad-hoc customizations, so the settings of that theme are by +default applied immediately. + +The variable 'custom--inhibit-theme-enable' controls this behavior; +its default value changed in Emacs 27.1. + +** The REPETITIONS argument of 'benchmark-run' can now also be a variable. + +** Interpretation of relative HOME directory has changed. +If $HOME is set to a relative file name, 'expand-file-name' now +interprets it relative to the directory where Emacs was started, not +relative to the 'default-directory' of the current buffer. We recommend +always setting $HOME to an absolute file name, so that its meaning is +independent of where Emacs was started. + +** The FILENAME argument to 'file-name-base' is now mandatory and no +longer defaults to 'buffer-file-name'. + +--- ** The function 'eldoc-message' now accepts a single argument. Programs that called it with multiple arguments before should pass them through 'format' first. Even that is discouraged: for ElDoc support, you should set 'eldoc-documentation-function' instead of calling 'eldoc-message' directly. -** Using '&rest' or '&optional' incorrectly is now an error. -For example giving '&optional' without a following variable, or -passing '&optional' multiple times: - - (defun foo (&optional &rest x)) - (defun bar (&optional &optional x)) - -Previously, Emacs would just ignore the extra keyword, or give -incorrect results in certain cases. - -** The pinentry.el library has been removed. -That package (and the corresponding change in GnuPG and pinentry) -was intended to provide a way to input passphrase through Emacs with -GnuPG 2.0. However, the change to support that was only implemented -in GnuPG >= 2.1 and didn't get backported to GnuPG 2.0. And with -GnuPG 2.1 and later, pinentry.el is not needed at all. So the -library was useless, and we removed it. GnuPG 2.0 is no longer -supported by the upstream project. - -To adapt to the change, you may need to set 'epa-pinentry-mode' to the -symbol 'loopback'. Alternatively, leave 'epa-pinentry-mode' at its -default value of nil, and remove the 'allow-emacs-pinentry' setting -from your 'gpg-agent.conf' configuration file, usually found in the -'~/.gnupg' directory. - -Note that previously, it was said that passphrase input through -minibuffer would be much less secure than other graphical pinentry -programs. However, these days the difference is insignificant: the -'read-password' function sufficiently protects input from leakage to -message logs. Emacs still doesn't use secure memory to protect -passphrases, but it was also removed from other pinentry programs as -the attack is unrealistic on modern computer systems which don't -utilize swap memory usually. - -** The function 'display-buffer-in-major-side-window' no longer exists. -It has been renamed as internal function 'window--make-major-side-window', -however applications should instead call 'display-buffer-in-side-window' -(passing the SIDE and SLOT parameters as elements of ALIST). This approach -is backwards-compatible with versions of Emacs in which the old function -exists. See the node "Displaying Buffers in Side Windows" in the ELisp -manual for more details. - -* Lisp Changes in Emacs 26.1 - -** The function 'assoc' now takes an optional third argument TESTFN. -This argument, when non-nil, is used for comparison instead of -'equal'. - -** New optional argument TESTFN in 'alist-get', 'map-elt' and 'map-put'. -If non-nil, the argument specifies a function to use for comparison, -instead of, respectively, 'assq' and 'eql'. - -** New function 'seq-set-equal-p' to check if SEQUENCE1 and SEQUENCE2 -contain the same elements, regardless of the order. - -** The new function 'mapbacktrace' applies a function to all frames of -the current stack trace. - -** The new function 'file-name-case-insensitive-p' tests whether a -given file is on a case-insensitive filesystem. - -** Several accessors for the value returned by 'file-attributes' -have been added. They are: 'file-attribute-type', -'file-attribute-link-number', 'file-attribute-user-id', -'file-attribute-group-id', 'file-attribute-access-time', -'file-attribute-modification-time', -'file-attribute-status-change-time', 'file-attribute-size', -'file-attribute-modes', 'file-attribute-inode-number', -'file-attribute-device-number' and 'file-attribute-collect'. - -** The new function 'buffer-hash' computes a fast, non-consing hash of -a buffer's contents. - -** 'interrupt-process' now consults the list 'interrupt-process-functions', -to determine which function has to be called in order to deliver the -SIGINT signal. This allows Tramp to send the SIGINT signal to remote -asynchronous processes. The hitherto existing implementation has been -moved to 'internal-default-interrupt-process'. - -** The new function 'read-multiple-choice' prompts for multiple-choice -questions, with a handy way to display help texts. - -** 'comment-indent-function' values may now return a cons to specify a -range of indentation. - -** New optional argument TEXT in 'make-temp-file'. - -** New function 'define-symbol-prop'. - -** New function 'secure-hash-algorithms' to list the algorithms that -'secure-hash' supports. -See the node "(elisp) Checksum/Hash" in the ELisp manual for details. - -** Emacs now exposes the GnuTLS cryptographic API with the functions -'gnutls-macs' and 'gnutls-hash-mac'; 'gnutls-digests' and -'gnutls-hash-digest'; 'gnutls-ciphers' and 'gnutls-symmetric-encrypt' -and 'gnutls-symmetric-decrypt'. -See the node "(elisp) GnuTLS Cryptography" in the ELisp manual for details. - -** The function 'gnutls-available-p' now returns a list of capabilities -supported by the GnuTLS library used by Emacs. - -** Emacs now supports records for user-defined types, via the new -functions 'make-record', 'record', and 'recordp'. Records are now -used internally to represent cl-defstruct and defclass instances, for -example. - -If your program defines new record types, you should use -package-naming conventions for naming those types. This is so any -potential conflicts with other types are avoided. - -** 'save-some-buffers' now uses 'save-some-buffers-default-predicate' -to decide which buffers to ask about, if the PRED argument is nil. -The default value of 'save-some-buffers-default-predicate' is nil, -which means ask about all file-visiting buffers. - -** string-(to|as|make)-(uni|multi)byte are now declared obsolete. - -** New variable 'while-no-input-ignore-events' which allow -setting which special events 'while-no-input' should ignore. -It is a list of symbols. - -** New function 'undo-amalgamate-change-group' to get rid of -undo-boundaries between two states. - -** New var 'definition-prefixes' is a hash table mapping prefixes to -the files where corresponding definitions can be found. This can be -used to fetch definitions that are not yet loaded, for example for -'C-h f'. - -** New var 'syntax-ppss-table' to control the syntax-table used in -'syntax-ppss'. - -** 'define-derived-mode' can now specify an :after-hook form, which -gets evaluated after the new mode's hook has run. This can be used to -incorporate configuration changes made in the mode hook into the -mode's setup. - -** Autoload files are now generated without timestamps. -Set 'autoload-timestamps' to a non-nil value to get timestamps in -autoload files. - -** 'gnutls-boot' now takes a parameter ':complete-negotiation' that -says that negotiation should complete even on non-blocking sockets. - -** There is now a new variable 'flyspell-sort-corrections-function' -that allows changing the way corrections are sorted. - -** The new command 'fortune-message' has been added, which displays -fortunes in the echo area. - -** New function 'func-arity' returns information about the argument list -of an arbitrary function. This generalizes 'subr-arity' for functions -that are not built-in primitives. We recommend using this new -function instead of 'subr-arity'. - -** New function 'region-bounds' can be used in the interactive spec -to provide region boundaries (for rectangular regions more than one) -to an interactively callable function as a single argument instead of -two separate arguments 'region-beginning' and 'region-end'. - -** 'parse-partial-sexp' state has a new element. -Element 10 is non-nil when the last character scanned might be the -first character of a two character construct, i.e., a comment -delimiter or escaped character. Its value is the syntax of that last -character. - -** 'parse-partial-sexp's state, element 9, has now been confirmed as -permanent and documented, and may be used by Lisp programs. Its value -is a list of currently open parenthesis positions, starting with the -outermost parenthesis. - -** 'read-color' will now display the color names using the color itself -as the background color. - -** The function 'redirect-debugging-output' now works on platforms -other than GNU/Linux. - -** The new function 'string-version-lessp' compares strings by -interpreting consecutive runs of numerical characters as numbers, and -compares their numerical values. According to this predicate, -"foo2.png" is smaller than "foo12.png". - -** Numeric comparisons and 'logb' no longer return incorrect answers -due to internal rounding errors. For example, '(< most-positive-fixnum -(+ 1.0 most-positive-fixnum))' now correctly returns t on 64-bit hosts. - -** The functions 'ffloor', 'fceiling', 'ftruncate' and 'fround' now -accept only floating-point arguments, as per their documentation. -Formerly, they quietly accepted integer arguments and sometimes -returned nonsensical answers, e.g., '(< N (ffloor N))' could return t. - -** On hosts like GNU/Linux x86-64 where a 'long double' fraction -contains at least EMACS_INT_WIDTH - 3 bits, 'format' no longer returns -incorrect answers due to internal rounding errors when formatting -Emacs integers with '%e', '%f', or '%g' conversions. For example, on -these hosts '(eql N (string-to-number (format "%.0f" N)))' now returns -t for all Emacs integers N. - -** Calls that accept floating-point integers (for use on hosts with -limited integer range) now signal an error if arguments are not -integral. For example '(decode-char 'ascii 0.5)' now signals an -error. - -** Functions 'string-trim-left', 'string-trim-right' and 'string-trim' -now accept optional arguments which specify the regexp of a substring -to trim. - -** The new function 'char-from-name' converts a Unicode name string -to the corresponding character code. - -** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a -Lisp object suitable for use with 'eq' and 'eql' correspondingly. If -two objects are 'eq' ('eql'), then the result of 'sxhash-eq' -('sxhash-eql') on them will be the same. - -** Function 'sxhash' has been renamed to 'sxhash-equal' for -consistency with the new functions. For compatibility, 'sxhash' -remains as an alias to 'sxhash-equal'. - -** 'make-hash-table' now defaults to a rehash threshold of 0.8125 -instead of 0.8, to avoid rounding glitches. - -** New function 'add-variable-watcher' can be used to call a function -when a symbol's value is changed. This is used to implement the new -debugger command 'debug-on-variable-change'. - -** New variable 'print-escape-control-characters' causes 'prin1' and -'print' to output control characters as backslash sequences. - -** Time conversion functions that accept a time zone rule argument now -allow it to be OFFSET or a list (OFFSET ABBR), where the integer -OFFSET is a count of seconds east of Universal Time, and the string -ABBR is a time zone abbreviation. The affected functions are -'current-time-string', 'current-time-zone', 'decode-time', -'format-time-string', and 'set-time-zone-rule'. - -** 'format-time-string' now formats '%q' to the calendar quarter. - -** New built-in function 'mapcan'. -It avoids unnecessary consing (and garbage collection). - -** 'car' and 'cdr' compositions 'cXXXr' and 'cXXXXr' are now part of Elisp. - -** 'gensym' is now part of Elisp. - -** Low-level list functions like 'length' and 'member' now do a better -job of signaling list cycles instead of looping indefinitely. - -** The new functions 'make-nearby-temp-file' and 'temporary-file-directory' -can be used for creation of temporary files on remote or mounted directories. - -** On GNU platforms when operating on a local file, 'file-attributes' -no longer suffers from a race when called while another process is -altering the filesystem. On non-GNU platforms 'file-attributes' -attempts to detect the race, and returns nil if it does so. - -** The new function 'file-local-name' can be used to specify arguments -of remote processes. - -** The new functions 'file-name-quote', 'file-name-unquote' and -'file-name-quoted-p' can be used to quote / unquote file names with -the prefix "/:". - -** The new error 'file-missing', a subcategory of 'file-error', is now -signaled instead of 'file-error' if a file operation acts on a file -that does not exist. - -** The function 'delete-directory' no longer signals an error when -operating recursively and when some other process deletes the directory -or its files before 'delete-directory' gets to them. - -** New error type 'user-search-failed' like 'search-failed' but -avoids debugger like 'user-error'. - -** The function 'line-number-at-pos' now takes a second optional -argument 'absolute'. If this parameter is nil, the default, this -function keeps on returning the line number taking potential narrowing -into account. If this parameter is non-nil, the function ignores -narrowing and returns the absolute line number. - -** The function 'color-distance' now takes a second optional argument -'metric'. When non-nil, it should be a function of two arguments that -accepts two colors and returns a number. - -** Changes in Frame and Window Handling +** Old-style backquotes now generate an error. +They have been generating warnings for a decade. To interpret +old-style backquotes as new-style, bind the new variable +'force-new-style-backquotes' to t. + +** Defining a Common Lisp structure using 'cl-defstruct' or +'cl-struct-define' whose name clashes with a builtin type (e.g., +'integer' or 'hash-table') now signals an error. + +** When formatting a floating-point number as an octal or hexadecimal +integer, Emacs now signals an error if the number is too large for the +implementation to format. + +** logb now returns infinity when given an infinite or zero argument, +and returns a NaN when given a NaN. Formerly, it returned an extreme +fixnum for such arguments. + +--- +** Some functions and variables obsolete since Emacs 22 have been removed: +archive-mouse-extract, assoc-ignore-case, assoc-ignore-representation, +backward-text-line, blink-cursor, bookmark-exit-hooks, +comint-use-prompt-regexp-instead-of-fields, compilation-finish-function, +count-text-lines, cperl-vc-header-alist, custom-face-save-command, +cvs-display-full-path, cvs-fileinfo->full-path, delete-frame-hook, +derived-mode-class, describe-char-after, describe-project, +desktop-basefilename, desktop-buffer-handlers, desktop-buffer-misc-functions, +desktop-buffer-modes-to-save, desktop-enable, desktop-load-default, +dired-omit-files-p, disabled-command-hook, dungeon-mode-map, +electric-nroff-mode, electric-nroff-newline, electric-perl-terminator, +focus-frame, forward-text-line, generic-define-mswindows-modes, +generic-define-unix-modes, generic-font-lock-defaults, goto-address-at-mouse, +highlight-changes-colours, ibuffer-elide-long-columns, ibuffer-hooks, +ibuffer-mode-hooks, icalendar-convert-diary-to-ical, +icalendar-extract-ical-from-buffer, imenu-always-use-completion-buffer-p, +ipconfig-program, ipconfig-program-options, isearch-lazy-highlight-cleanup, +isearch-lazy-highlight-initial-delay, isearch-lazy-highlight-interval, +isearch-lazy-highlight-max-at-a-time, iswitchb-use-fonts, +latin1-char-displayable-p, mouse-wheel-click-button, mouse-wheel-down-button, +mouse-wheel-up-button, new-frame, pascal-outline, process-kill-without-query, +recentf-menu-append-commands-p, rmail-pop-password, +rmail-pop-password-required, savehist-load, set-default-font, +spam-list-of-processors, speedbar-add-ignored-path-regexp, +speedbar-buffers-line-path, speedbar-ignored-path-expressions, +speedbar-ignored-path-regexp, speedbar-line-path, speedbar-path-line, +timer-set-time-with-usecs, tooltip-gud-display, tooltip-gud-modes, +tooltip-gud-toggle-dereference, unfocus-frame, unload-hook-features-list, +update-autoloads-from-directories, vc-comment-ring, vc-comment-ring-index, +vc-comment-search-forward, vc-comment-search-reverse, vc-comment-to-change-log, +vc-diff-switches-list, vc-next-comment, vc-previous-comment, view-todo, +x-lost-selection-hooks, x-sent-selection-hooks. + +--- +** Further functions and variables obsolete since Emacs 24 have been removed: +default-directory-alist, dired-default-directory, +dired-default-directory-alist, dired-enable-local-variables, +dired-hack-local-variables, dired-local-variables-file, dired-omit-here-always. + +** Garbage collection no longer treats miscellaneous objects specially; +they are now allocated like any other pseudovector. As a result, the +'garbage-collect' and 'memory-use-count' functions no longer return a +'misc' component, and the 'misc-objects-consed' variable has been +removed. + ++++ +** Reversed character ranges are no longer permitted in rx. +Previously, ranges where the starting character is greater than the +ending character were silently omitted. +For example, '(rx (any "@z-a" (?9 . ?0)))' would match '@' only. +Now, such rx expressions generate an error. + ++++ +** 'text-mode' no longer sets the value of 'indent-line-function'. +The global value of 'indent-line-function', which defaults to +'indent-relative', will no longer be reset locally when turning on +'text-mode'. + +To get back the old behavior, add a function to 'text-mode-hook' which +performs (setq-local indent-line-function #'indent-relative). -*** Resizing a frame no longer runs 'window-configuration-change-hook'. -'window-size-change-functions' should be used instead. - -*** The new function 'frame-size-changed-p' can tell whether a frame has -been resized since the last time 'window-size-change-functions' has been -run. - -*** The function 'frame-geometry' now also returns the width of a -frame's outer border. - -*** New frame parameters and changed semantics for older ones: - -**** 'z-group' positions a frame above or below all others. - -**** 'min-width' and 'min-height' specify the absolute minimum size of a -frame. - -**** 'parent-frame' makes a frame the child frame of another Emacs -frame. The section "(elisp) Child Frames" in the ELisp manual -describes the intrinsics of that relationship. - -**** 'delete-before' triggers deletion of one frame before that of -another. - -**** 'mouse-wheel-frame' specifies another frame whose windows shall be -scrolled instead. - -**** 'no-other-frame' has 'next-frame' and 'previous-frame' skip this -frame. - -**** 'skip-taskbar' removes a frame's icon from the taskbar and has -'Alt-<TAB>' skip this frame. - -**** 'no-focus-on-map' avoids that a frame gets input focus when mapped. - -**** 'no-accept-focus' means that a frame does not want to get input -focus via the mouse. - -**** 'undecorated' removes the window manager decorations from a frame. - -**** 'override-redirect' tells the window manager to disregard this -frame. - -**** 'width' and 'height' now allow the specification of pixel values -and ratios. - -**** 'left' and 'top' now allow the specification of ratios. - -**** 'keep-ratio' preserves size and position of child frames when their -parent frame is resized. - -**** 'no-special-glyphs' suppresses display of truncation and -continuation glyphs in a frame. - -**** 'auto-hide-function' and 'minibuffer-exit' handle auto hiding of -frames and exiting from minibuffer individually. - -**** 'fit-frame-to-buffer-margins' and 'fit-frame-to-buffer-sizes' -handle fitting a frame to its buffer individually. - -**** 'drag-internal-border', 'drag-with-header-line', -'drag-with-mode-line', 'snap-width', 'top-visible' and 'bottom-visible' -allow dragging and resizing frames with the mouse. - -**** 'minibuffer' is now set to the default minibuffer window when -initially specified as nil and is not reset to nil when initially -specifying a minibuffer window. - -*** The new function 'frame-list-z-order' returns a list of all frames -in Z (stacking) order. - -*** The function 'x-focus-frame' optionally tries to not activate its -frame. - -*** The variable 'focus-follows-mouse' has a third meaningful value -'auto-raise' to indicate that the window manager automatically raises a -frame when the mouse pointer enters it. - -*** The new function 'frame-restack' puts a frame above or below -another on the display. - -*** The new face 'internal-border' specifies the background of a frame's -internal border. - -*** The NORECORD argument of 'select-window' now has a meaningful value -'mark-for-redisplay' which is like any other non-nil value but marks -WINDOW for redisplay. - -*** Support for side windows is now official. The display action -function 'display-buffer-in-side-window' will display its buffer in a -side window. Functions for toggling all side windows on a frame, -changing and reversing the layout of side windows and returning the -main (major non-side) window of a frame are provided. For details -consult the section "(elisp) Side Windows" in the ELisp manual. - -*** Support for atomic windows - rectangular compositions of windows -treated by 'split-window', 'delete-window' and 'delete-other-windows' -like a single live window - is now official. For details consult the -section "(elisp) Atomic Windows" in the ELisp manual. - -*** New 'display-buffer' alist entry 'window-parameters' allows the -assignment of window parameters to the window used for displaying the -buffer. - -*** New function 'display-buffer-reuse-mode-window' is an action function -suitable for use in 'display-buffer-alist'. For example, to avoid -creating a new window when opening man pages when there's already one, -use - -(add-to-list 'display-buffer-alist - '("\\`\\*Man .*\\*\\'" . - (display-buffer-reuse-mode-window - (inhibit-same-window . nil) - (mode . Man-mode)))) - -*** New window parameter 'no-delete-other-windows' prevents that -its window gets deleted by 'delete-other-windows'. - -*** New window parameters 'mode-line-format' and 'header-line-format' -allow the buffer-local formats for this window to be overridden. - -*** New command 'window-swap-states' swaps the states of two live -windows. - -*** New functions 'window-pixel-width-before-size-change' and -'window-pixel-height-before-size-change' support detecting which -window changed size when 'window-size-change-functions' are run. - -*** The new function 'window-lines-pixel-dimensions' returns the pixel -dimensions of a window's text lines. - -*** The new function 'window-largest-empty-rectangle' returns the -dimensions of the largest rectangular area not occupying any text in a -window's body. - -*** The semantics of 'mouse-autoselect-window' has changed slightly. -For details see the section "(elisp) Mouse Window Auto-selection" in -the ELisp manual. - -*** 'select-frame-by-name' now may return a frame on another display -if it does not find a suitable one on the current display. - -** 'tcl-auto-fill-mode' is now declared obsolete. -Its functionality can be replicated simply by setting -'comment-auto-fill-only-comments'. - -** New pcase pattern 'rx' to match against an rx-style regular expression. -For details, see the doc string of 'rx--pcase-macroexpander'. + +* Lisp Changes in Emacs 27.1 + +** i18n (internationalization) + +*** ngettext can be used now to return the right plural form +according to the given numeric value. + ++++ +** inhibit-null-byte-detection is renamed to inhibit-nul-byte-detection + ++++ +** 'self-insert-command' takes the char to insert as (optional) argument. + +** 'lookup-key' can take a list of keymaps as argument. + ++++ +** 'condition-case' now accepts 't' to match any error symbol. + ++++ +** New function 'proper-list-p'. +Given a proper list as argument, this predicate returns its length; +otherwise, it returns nil. 'format-proper-list-p' is now an obsolete +alias for the new function. + ++++ +** Emacs Lisp integers can now be of arbitrary size. +Emacs uses the GNU Multiple Precision (GMP) library to support +integers whose size is too large to support natively. The integers +supported natively are known as "fixnums", while the larger ones are +"bignums". The new predicates 'bignump' and 'fixnump' can be used to +distinguish between these two types of integers. + +All the arithmetic, comparison, and logical (a.k.a. "bitwise") +operations where bignums make sense now support both fixnums and +bignums. However, note that unlike fixnums, bignums will not compare +equal with 'eq', you must use 'eql' instead. (Numerical comparison +with '=' works on both, of course.) + +Since large bignums consume a lot of memory, Emacs limits the size of +the largest bignum a Lisp program is allowed to create. The +nonnegative value of the new variable 'integer-width' specifies the +maximum number of bits allowed in a bignum. Emacs signals an integer +overflow error if this limit is exceeded. + +Several primitive functions formerly returned floats or lists of +integers to represent integers that did not fit into fixnums. These +functions now simply return integers instead. Affected functions +include functions like 'encode-char' that compute code-points, functions +like 'file-attributes' that compute file sizes and other attributes, +functions like 'process-id' that compute process IDs, and functions like +'user-uid' and 'group-gid' that compute user and group IDs. + ++++ +** Although the default timestamp format is still (HI LO US PS), +it is planned to change in a future Emacs version, to exploit bignums. +The documentation has been updated to mention that the timestamp +format may change and that programs should use functions like +'format-time-string', 'decode-time', and 'encode-time' rather than +probing the innards of a timestamp directly, or creating a timestamp +by hand. + ++++ +** 'encode-time' supports a new API '(encode-time TIME &optional FORM)'. +This can convert decoded times and Lisp time values to Lisp timestamps +of various forms, including a new timestamp form '(TICKS . HZ)', where +TICKS is an integer and HZ is a positive integer denoting a clock +frequency. The old 'encode-time' API is still supported. + ++++ +** 'time-add', 'time-subtract', and 'time-less-p' now accept +infinities and NaNs too, and propagate them or return nil like +floating-point operators do. + ++++ +** New function 'time-equal-p' compares time values for equality. + ++++ +** 'format-time-string' supports a new conversion specifier flag '+' +that acts like the '0' flag but also puts a '+' before nonnegative +years containing more than four digits. This is for compatibility +with POSIX.1-2017. + +** 'define-minor-mode' automatically documents the meaning of ARG. + ++++ +** The function 'recenter' now accepts an additional optional argument. +By default, calling 'recenter' will not redraw the frame even if +'recenter-redisplay' is non-nil. Call 'recenter' with the new second +argument non-nil to force redisplay per 'recenter-redisplay's value. + ++++ +** New functions 'major-mode-suspend' and 'major-mode-restore'. +Use them when switching temporarily to another major mode, e.g. for +'hexl-mode', or to switch between 'c-mode' and 'image-mode' in XPM. + ++++ +** New macro 'dolist-with-progress-reporter'. +This works like 'dolist', but reports progress similar to +'dotimes-with-progress-reporter'. + ++++ +** New hook 'after-delete-frame-functions'. +This works like 'delete-frame-functions', but runs after the frame to +be deleted has been made dead and removed from the frame list. + +--- +** The function 'provided-mode-derived-p' was extended to support aliases. +The function now returns non-nil when the argument MODE is derived +from any alias of any of MODES. + ++++ +** New frame focus state inspection interface. +The hooks 'focus-in-hook' and 'focus-out-hook' are now obsolete. +Instead, attach to 'after-focus-change-function' using 'add-function' +and inspect the focus state of each frame using 'frame-focus-state'. + ++++ +** Emacs now requests and recognizes focus-change notifications from TTYs. +On terminal emulators that support the feature, Emacs can now support +'focus-in-hook' and 'focus-out-hook' for TTY frames. + ++++ +** Window-specific face remapping. +Face specifications (of the kind used in 'face-remapping-alist') +now support filters, allowing faces to vary between different windows +displaying the same buffer. See the node "(elisp) Face Remapping" +of the Emacs Lisp Reference manual for more detail. + ++++ +** Window change functions have been redesigned. + +Hooks reacting to window changes run now only when redisplay detects +that a change has actually occurred. Six hooks are now provided: +'window-buffer-change-functions' (run after window buffers have +changed), 'window-size-change-functions' (run after a window was +assigned a new buffer or size), 'window-configuration-change-hook' +(like the former but run also when a window was deleted), +'window-selection-change-functions' (run when the selected window +changed) and 'window-state-change-functions' and +'window-state-change-hook' (run when any of the preceding ones is +run). Applications can enforce running the latter two using the new +function 'set-frame-window-state-change'. 'window-scroll-functions' +are unaffected by these changes. + +In addition, a number of functions now allow the caller to detect what +has changed since last redisplay: 'window-old-buffer' returns for any +window the buffer it showed at that time. ‘old-selected-window’ and +'old-selected-frame' return the window and frame that were selected +during last redisplay. 'window-old-pixel-width' (renamed from +'window-pixel-width-before-size-change'), 'window-old-pixel-height' +(renamed from 'window-pixel-height-before-size-change'), +'window-old-body-pixel-width' and 'window-old-body-pixel-height' +return the total and body sizes of any window during last redisplay. + +See the section "(elisp) Window Hooks" in the Elisp manual for a +detailed explanation of the new behavior. + ++++ +*** New option 'resize-mini-frames'. +This option allows to automatically resize minibuffer-only frames +similarly to how minibuffer windows are resized on "normal" frames. + ++++ +** New buffer display action alist entry 'dedicated'. +Such an entry allows to specify the dedicated status of a window +created by 'display-buffer'. + ++++ +** New buffer display action alist entry 'window-min-height'. +Such an entry allows to specify a minimum height of the window used +for displaying a buffer. 'display-buffer-below-selected' is the only +action function to respect it at the moment. + ++++ +** The function 'assoc-delete-all' now takes an optional predicate argument. + ++++ +** New function 'string-distance' to calculate the Levenshtein distance +between two strings. + +** 'print-quoted' now defaults to t, so if you want to see +'(quote x)' instead of 'x you will have to bind it to nil where applicable. + ++++ +** Numbers formatted via '%o' or '%x' are now formatted as signed integers. +This avoids problems in calls like '(read (format "#x%x" -1))', and is +more compatible with bignums. To get the traditional machine-dependent +behavior, set the experimental variable 'binary-as-unsigned' to t, +and if the new behavior breaks your code please email +32252@debbugs.gnu.org. Because '%o' and '%x' can now format signed +integers, they now support the '+' and space flags. + +** To avoid confusion caused by "smart quotes", the reader signals an +error when reading Lisp symbols which begin with one of the following +quotation characters: ‘’‛“”‟〞＂＇. A symbol beginning with such a +character can be written by escaping the quotation character with a +backslash. For example: + + (read "‘smart") => (invalid-read-syntax "strange quote" "‘") + (read "\\‘smart") == (intern "‘smart") + ++++ +** Omitting variables after '&optional' and '&rest' is now allowed. +For example '(defun foo (&optional))' is no longer an error. This is +sometimes convenient when writing macros. See the ChangeLog entry +titled "Allow '&rest' or '&optional' without following variable +(Bug#29165)" for a full listing of which arglists are accepted across +versions. + +** Internal parsing commands now use 'syntax-ppss' and disregard +'open-paren-in-column-0-is-defun-start'. This affects mostly things like +'forward-comment', 'scan-sexps', and 'forward-sexp' when parsing backward. +The new variable 'comment-use-syntax-ppss' can be set to nil to recover +the old behavior if needed. + +** The 'server-name' and 'server-socket-dir' variables are set when a +socket has been passed to Emacs. + +--- +** The 'file-system-info' function is now available on all platforms. +instead of just Microsoft platforms. This fixes a 'get-free-disk-space' +bug on OS X 10.8 and later. + +--- +** The function 'get-free-disk-space' returns now a non-nil value for +remote systems, which support this check. + ++++ +** 'memory-limit' now returns a better estimate of memory consumption. + ++++ +** New macro 'combine-change-calls' arranges to call the change hooks +('before-change-functions' and 'after-change-functions') just once +each around a sequence of lisp forms, given a region. This is +useful when a function makes a possibly large number of repetitive +changes and the change hooks are time consuming. + ++++ +** 'eql', 'make-hash-table', etc. now treat NaNs consistently. +Formerly, some of these functions ignored signs and significands of +NaNs. Now, all these functions treat NaN signs and significands as +significant. For example, '(eql 0.0e+NaN -0.0e+NaN)' now returns nil +because the two NaNs have different signs; formerly it returned t. +Also, Emacs now reads and prints NaN significands; e.g., if X is a +NaN, '(format "%s" X)' now returns "0.0e+NaN", "1.0e+NaN", etc., +depending on X's significand. + ++++ +** The function 'make-string' accepts an additional optional argument. +If the optional third argument is non-nil, 'make-string' will produce +a multibyte string even if its second argument is an ASCII character. + +** '(format "%d" X)' no longer mishandles a floating-point number X that +does not fit in a machine integer. + +--- +** New coding-system 'ibm038'. +This is the International EBCDIC encoding, also available as aliases +'ebcdic-int' and 'cp038'. + ++++ +** In the DST slot, 'encode-time' and 'parse-time-string' now return -1 +if it is not known whether daylight saving time is in effect. +Formerly they were inconsistent: 'encode-time' returned t in this +situation, whereas 'parse-time-string' returned nil. Now they +consistently use use nil to mean that DST is not in effect, and use -1 +to mean that it is not known whether DST is in effect. + +** New JSON parsing and serialization functions 'json-serialize', +'json-insert', 'json-parse-string', and 'json-parse-buffer'. These +are implemented in C using the Jansson library. + ++++ +** New function 'ring-resize'. +'ring-resize' can be used to grow or shrink a ring. + ++++ +** New function 'flatten-tree'. +'flatten-list' is provided as an alias. These functions take a tree +and 'flatten' it such that the result is a list of all the terminal +nodes. + ++++ +** 'zlib-decompress-region' can partially decompress corrupted data. +If the new optional ALLOW-PARTIAL argument is passed, then the data +that was decompressed successfully before failing will be inserted +into the buffer. + +** Mailcap + +--- +*** The new function 'mailcap-file-name-to-mime-type' has been added. +It's a simple convenience function for looking up MIME types based on +file name extensions. + +*** The default way the list of possible external viewers for MIME +types is sorted and chosen has changed. Earlier, the most specific +viewer was chosen, even if there was a general override in "~/.mailcap". +For instance, if "/etc/mailcap" has an entry for "image/gif", that one +will be chosen even if you have an entry for "image/*" in your +"~/.mailcap" file. But with the new method, entries from "~/.mailcap" +overrides all system and Emacs-provided defaults. To get the old +method back, set 'mailcap-prefer-mailcap-viewers' to nil. -** New functions to set region from secondary selection and vice versa. -The new functions 'secondary-selection-to-region' and -'secondary-selection-from-region' let you set the beginning and the -end of the region from those of the secondary selection and vice -versa. +** URL -** New function 'lgstring-remove-glyph' can be used to modify a -gstring returned by the underlying layout engine (e.g. m17n-flt, -uniscribe). +*** The 'file:' handler no longer looks for "index.html" in +directories if you ask it for a "file:///dir" URL. Since this is a +low-level library, such decisions (if they are to be made at all) are +left to higher-level functions. + +** Image mode + +*** 'image-mode' started using ImageMagick by default for all images +some years back. It now respects 'imagemagick-types-inhibit' as a way +to disable that. + +--- +*** Some image-mode variables are now buffer-local. +The image parameters 'image-transform-rotation', +'image-transform-scale' and 'image-transform-resize' are now declared +buffer-local, so each buffer could have its own values for these +parameters. + +** The function 'load' now behaves correctly when loading modules. +Specifically, it puts the module name into 'load-history', prints +loading messages if requested, and protects against recursive loads. + ++++ +** The function 'read-variable' now uses its own history list. +The history of variable names read by 'read-variable' is recorded in +the new variable 'custom-variable-history'. + +--- +** The function 'string-to-unibyte' is no longer declared obsolete. +We have found that there are legitimate use cases for this function, +where there's no better alternative. We believe that the incorrect +uses of this function all but disappeared by now, so we are +un-obsoleting it. + ++++ +** New function 'group-name' returns a group name corresponding to GID. + ++++ +** 'make-process' now takes a keyword argument ':file-handler'; if +that is non-nil, it will look for a file name handler for the current +buffer's 'default-directory' and invoke that file name handler to make +the process. That way 'make-process' can start remote processes. + ++++ +** Emacs now supports resizing (scaling) of images without ImageMagick. +All modern systems are supported by this feature. (On GNU and Unix +systems, Cairo drawing or the XRender extension to X11 is required for +this to be available; the configure script will test for it and, if +found, enable scaling.) + +The new function 'image-scaling-p' can be used to test whether any +given frame supports resizing. + ++++ +** (locale-info 'paper) now returns the paper size on systems that support it. +This is currently supported on GNUish hosts and on modern versions of +MS-Windows. + +** New module environment function 'process_input' to process user +input while module code is running. + ++++ +** The function 'regexp-opt' accepts an additional optional argument. +By default, the regexp returned by 'regexp-opt' may match the strings +in any order. If the new third argument is non-nil, the match is +guaranteed to be performed in the order given, as if the strings were +made into a regexp by joining them with '\|'. + ++++ +** The function 'regexp-opt', when given an empty list of strings, now +returns a regexp that never matches anything, which is an identity for +this operation. Previously, the empty string was returned in this +case. -* Changes in Emacs 26.1 on Non-Free Operating Systems - -** Intercepting hotkeys on Windows 7 and later now works better. -The new keyboard hooking code properly grabs system hotkeys such as -'Win-*' and 'Alt-TAB', in a way that Emacs can get at them before the -system. This makes the 'w32-register-hot-key' functionality work -again on all versions of MS-Windows starting with Windows 7. On -Windows NT and later you can now register any hotkey combination. (On -Windows 9X, the previous limitations, spelled out in the Emacs manual, -still apply.) - -** 'convert-standard-filename' no longer mirrors slashes on MS-Windows. -Previously, on MS-Windows this function converted slash characters in -file names into backslashes. It no longer does that. If your Lisp -program used 'convert-standard-filename' to prepare file names to be -passed to subprocesses (which is not the recommended usage of that -function), you will now have to mirror slashes in your application -code. One possible way is this: - - (let ((start 0)) - (while (string-match "/" file-name start) - (aset file-name (match-beginning 0) ?\\) - (setq start (match-end 0)))) - -** GUI sessions on MS-Windows now treat SIGINT like Posix platforms do. -The effect of delivering a Ctrl-C (SIGINT) signal to a GUI Emacs on -MS-Windows is now the same as on Posix platforms -- Emacs saves the -session and exits. In particular, this will happen if you start -emacs.exe from the Windows shell, then type Ctrl-C into that shell's -window. - -** 'signal-process' supports SIGTRAP on Windows XP and later. -The 'kill' emulation on Windows now maps SIGTRAP to a call to the -'DebugBreakProcess' API. This causes the receiving process to break -execution and return control to the debugger. If no debugger is -attached to the receiving process, the call is typically ignored. -This is in contrast to the default action on POSIX Systems, where it -causes the receiving process to terminate with a core dump if no -debugger has been attached to it. - -** 'set-mouse-position' and 'set-mouse-absolute-pixel-position' work -on macOS. - -** Emacs can now be run as a GUI application from the command line on -macOS. - -** 'ns-appearance' and 'ns-transparent-titlebar' change the appearance -of frame decorations on macOS 10.9+. - -** 'ns-use-thin-smoothing' enables thin font smoothing on macOS 10.8+. - -** 'process-attributes' on Darwin systems now returns more information. - -** Mousewheel and trackpad scrolling on macOS 10.7+ now behaves more -like the macOS default. The new variables 'ns-mwheel-line-height', -'ns-use-mwheel-acceleration' and 'ns-use-mwheel-momentum' can be used -to customize the behavior. +* Changes in Emacs 27.1 on Non-Free Operating Systems + +--- +** Battery status is now supported in all Cygwin builds. +Previously it was supported only in the Cygwin-w32 build. + +** Emacs now handles key combinations involving the macOS "command" +and "option" modifier keys more correctly. + +** The special handling of 'frame-title-format' on NS where setting it +to 't' would enable the macOS proxy icon has been replaced with a +separate variable, 'ns-use-proxy-icon'. 'frame-title-format' will now +work as on other platforms. + +--- +** New primitive 'w32-read-registry'. +This primitive lets Lisp programs access the MS-Windows Registry by +retrieving values stored under a given key. It is intended to be used +for supporting features such as XDG-like location of important files +and directories. + ++++ +** The default value of 'w32-pipe-read-delay' is now zero. +This speeds up reading output from sub-processes that produce a lot of +data. + +This variable may need to be non-zero only when running DOS programs +as Emacs subprocesses, which by now is not supported on modern +versions of MS-Windows. Set this variable to 50 if for some reason +you need the old behavior (and please report such situations to Emacs +developers). + +--- +** New variable 'w32-multibyte-code-page'. +This variable holds the value of the multibyte code page used by the +system. It is usually zero, which indicates that 'w32-ansi-code-page' +is being used, except in Far Eastern locales. When this variable is +non-zero, Emacs at startup sets 'locale-coding-system' to the +corresponding encoding, instead of using 'w32-ansi-code-page'. + ++++ +** On NS the behaviour of drag and drop can now be modified by use of +modifier keys in line with Apples guidelines. This makes the drag and +drop behaviour more consistent, as previously the sending application +was able to 'set' modifiers without the knowledge of the user. ---------------------------------------------------------------------- |