From: Paul Eggert Date: Sat, 30 Sep 2017 05:06:33 +0000 (-0700) Subject: Merge from origin/emacs-26 X-Git-Tag: emacs-27.0.90~6278 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=20a09de953f437109a098fa8c4d380663d921481;p=emacs.git Merge from origin/emacs-26 3ab2f9bbb9 Merge from gnulib cbc8324488 Prefer HTTPS to HTTP for gnu.org bbda601d1d ; Spelling fixes 695cf5300b Wait for frame visibility with timeout in w32term too e1f6e3127a Bring back the busy wait after x_make_frame_visible (Bug#2... bccf635217 ; * src/gtkutil.c (xg_check_special_colors): Add another G... 26d58f0c58 ; Standardize license notices 61225964ed Revert "bug#28609: simple.el" a75ab3b3fb bug#28609: simple.el c7a21430c1 ; * etc/NEWS: Fix last change. 33401b26b1 Merge branch 'emacs-26' of git.savannah.gnu.org:/srv/git/e... d4b2bbdc73 Merge branch 'emacs-26' into scratch/org-mode-merge c1ac8c170f Merge branch 'emacs-26' of git.savannah.gnu.org:/srv/git/e... af130f900f Fix ert backtrace saving for non-`signal'ed errors (Bug#28... 7476eeaa23 Revert "Fix build on macOS (bug#28571)" fec63089d5 Fix build on macOS (bug#28571) 0f9a78e770 Add tests for `css-current-defun-name' 88a0dd71f1 In w32fullscreen_hook don't add decorations to undecorated... 18073beb14 Merge branch 'emacs-26' of git.savannah.gnu.org:/srv/git/e... 1eef11b7be Fix doc string of 'dired-listing-switches' eaefbc26d5 ; Add files missing in ab351d442d7 ab351d442d Update Org to v9.1.1 --- 20a09de953f437109a098fa8c4d380663d921481 diff --cc etc/NEWS index a71d74a9ad4,ab9a2a5f32d..238c7b7ea42 --- a/etc/NEWS +++ b/etc/NEWS @@@ -23,45 -22,1892 +23,50 @@@ Temporary note When you add a new item, use the appropriate mark if you are sure it applies, -* 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. - -** 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'. - -** 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. +* Installation Changes in Emacs 27.1 -* 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 -"Colors on a TTY" for more information. - -+++ -** Emacs now obeys the X resource "scrollBar" at startup. -The effect is similar to that of "toolBar" resource on the tool bar. +* Startup Changes in Emacs 27.1 -* 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 "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 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. - -+++ -** The new user option 'mouse-select-region-move-to-beginning' -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. - -+++ -** The new user option 'mouse-drag-and-drop-region' allows to drag the -entire region of text to another place or another buffer. - -+++ -** 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. - ---- -** 'find-library' now takes a prefix argument to pop to a different -window. - ---- -** '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 variable 'dir-locals-file-2' 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 "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. - -+++ -** 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 behaviour 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'. - ---- -** 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 'mwheel-tilt-scroll-p'. If you -want to reverse the direction of the scroll, customize -'mwheel-flip-direction'. - -+++ -** 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 -"emacsclient Options" in the user manual for the details. - ---- -** 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 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" "X" "Y")' produces "Y X". - -+++ -** 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'. - -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. - -+++ -** 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. +* Changes in Emacs 27.1 -* 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 highlighted the current -line 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. +* Editing Changes in Emacs 27.1 + --- + ** 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). + -* Changes in Specialized Modes and Packages in Emacs 26.1 +* Changes in Specialized Modes and Packages in Emacs 27.1 ---- -** New function `cl-generic-p'. - -** Dired - -+++ -*** You can answer 'all' in 'dired-do-delete' to delete recursively all -remaining directories without more prompts. - -+++ -*** Dired supports wildcards in the directory part of the file names. - -+++ -*** You can now use '`?`' in 'dired-do-shell-command'. -It gets replaced by the current file name, like ' ? '. - -+++ -*** A new option 'dired-always-read-filesystem' default to nil. -If non-nil, buffers visiting files are reverted before search them; -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. - ---- -*** 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. - -+++ -*** 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. - -+++ -*** 'W' is now bound to 'browse-url-of-dired-file', and is useful for -viewing HTML files and the like. - ---- -*** 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. - ---- -** html2text is now marked obsolete. - ---- -** smerge-refine-regions can refine regions in separate buffers - ---- -** Info menu and index completion uses substring completion by default. -This can be customized via the info-menu category in -completion-category-override. - -+++ -** 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. - ---- -** TeX: Add luatex and xetex as alternatives to pdftex - -** Electric-Buffer-menu - -+++ -*** Key 'U' is bound to 'Buffer-menu-unmark-all' and key 'M-DEL' is -bound to 'Buffer-menu-unmark-all-buffers'. - -** bs - ---- -*** Two new commands 'bs-unmark-all', bound to 'U', and -'bs-unmark-previous', bound to . - -** Buffer-menu - -+++ -*** Two new commands 'Buffer-menu-unmark-all', bound to 'U' and -'Buffer-menu-unmark-all-buffers', bound to 'M-DEL'. - ---- -** Checkdoc - -*** 'checkdoc-arguments-in-order-flag' now defaults to nil. - -** Gnus +** Enhanced xterm support ---- -*** The .newsrc file will now only be saved if the native select -method is an NNTP select method. - -+++ -*** A new command for sorting articles by readedness marks has been -added: 'C-c C-s C-m C-m'. - -+++ - -*** 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. - -** Ibuffer - ---- -*** New command 'ibuffer-jump'. - ---- -*** 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'. - ---- -*** Two new commands 'ibuffer-filter-chosen-by-completion' -and 'ibuffer-and-filter', the second bound to '/&'. - ---- -*** The commands 'ibuffer-pop-filter', 'ibuffer-pop-filter-group', -'ibuffer-or-filter' and 'ibuffer-filter-disable' have the alternative -bindings '/', '/S-', '/|' and '/DEL', respectively. - ---- -*** 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. - ---- -*** A new command 'ibuffer-copy-buffername-as-kill'; bound -to 'B'. - ---- -*** New command 'ibuffer-change-marks'; bound to '* c'. - ---- -*** A new command 'ibuffer-mark-by-locked' to mark -all locked buffers; bound to '% L'. - ---- -*** A new option 'ibuffer-locked-char' to indicate -locked buffers; Ibuffer shows a new column displaying -'ibuffer-locked-char' for locked buffers. - ---- -*** A new command 'ibuffer-unmark-all-marks' to unmark -all buffers without asking confirmation; bound to -'U'; 'ibuffer-do-replace-regexp' bound to 'r'. - ---- -*** A new command 'ibuffer-mark-by-content-regexp' to mark buffers -whose content matches a regexp; bound to '% g'. - ---- -*** Two new options 'ibuffer-never-search-content-name' and -'ibuffer-never-search-content-mode' used by -'ibuffer-mark-by-content-regexp'. - -** Browse-URL - ---- -*** Support for opening links to man pages in Man or WoMan mode. - -** Comint - ---- -*** 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. - -** Compilation mode - ---- -*** Messages from CMake are now recognized. - -+++ -*** The number of errors, warnings, and informational messages is now -displayed in the mode line. These are updated as compilation -proceeds. - -** Grep - ---- -*** 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'. - ---- -*** The grep/rgrep/lgrep functions will now ask about saving files -before running. This is controlled by the 'grep-save-buffers' -variable. - -** Edebug - ---- -*** 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'. - -+++ -*** New customizable option 'edebug-max-depth' -This allows to enlarge the maximum recursion depth when instrumenting -code. - -** Eshell - ---- -*** '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. - -** 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. - ---- -*** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision -with the 'o' command from 'image-map'. - -+++ -*** 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. - ---- -*** 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). - ---- -*** 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. - - -** Ido - ---- -*** 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. - -** Images - -+++ -*** Images are automatically scaled before displaying based on the -'image-scaling-factor' variable (if Emacs supports scaling the images -in question). - -+++ -*** 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.) - -+++ -*** 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'. - -+++ -*** A new library for creating and manipulating SVG images has been -added. See the "SVG Images" section in the Lisp reference manual for -details. - -+++ -*** New setf-able function to access and set image parameters is -provided: 'image-property'. - ---- -*** 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. - -** Image-Dired - ---- -*** Now provides a minor mode 'image-dired-minor-mode' which replaces -the function 'image-dired-setup-dired-keybindings'. - ---- -*** Thumbnail generation is now asynchronous. -The number of concurrent processes is limited by the variable -'image-dired-thumb-job-limit'. - ---- -*** 'image-dired-thumbnail-storage' has a new option 'standard-large' -for generating 256x256 thumbnails according to the Thumbnail Managing -Standard. - ---- -*** Inherits movement keys from 'image-mode' for viewing full images. -This includes the usual char, line, and page movement 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' - ---- -*** Recognizes more tools by default, including pngnq-s9 and OptiPNG - ---- -*** 'find-file' and related commands now work on thumbnails and -displayed images, providing a default argument of the original file name -via an addition to 'file-name-at-point-functions'. - ---- -** The default 'Info-default-directory-list' no longer checks some obsolete -directory suffixes (gnu, gnu/lib, gnu/lib/emacs, emacs, lib, lib/emacs) -when searching for info directories. - -+++ -** The commands that add ChangeLog entries now prefer a VCS root directory -for the ChangeLog file, if none already exists. Customize -'change-log-directory-files' to nil for the old behavior. - ---- -** Support for non-string values of 'time-stamp-format' has been removed. - -** Message - ---- -*** 'message-use-idna' now defaults to t (because Emacs comes with -built-in IDNA support now). - ---- -*** When sending HTML messages with embedded images, and you have -exiftool installed, and you rotate images with EXIF data (i.e., -JPEGs), the rotational information will be inserted into the outgoing -image in the message. (The original image will not have its -orientation affected.) - ---- -*** The 'message-valid-fqdn-regexp' variable has been removed, since -there are now top-level domains added all the time. Message will no -longer warn about sending emails to top-level domains it hasn't heard -about. - -*** 'message-beginning-of-line' (bound to C-a) understands folded headers. -In 'visual-line-mode' it will look for the true beginning of a header -while in non-'visual-line-mode' it will move the point to the indented -header's value. - -** Package - -+++ -*** The new variable 'package-gnupghome-dir' has been added to control -where the GnuPG home directory (used for signature verification) is -located and whether GnuPG's option "--homedir" is used or not. - ---- -*** Deleting a package no longer respects 'delete-by-moving-to-trash'. - -** Tramp - -+++ -*** The method part of remote file names is mandatory now. -A valid remote file name starts with "/method:host:" or -"/method:user@host:". - -+++ -*** The new pseudo method "-" is a marker for the default method. -"/-::" is the shortest remote file name then. - -+++ -*** The command 'tramp-change-syntax' allows to choose an alternative -remote file name syntax. - -+++ -*** New connection method "sg", which supports editing files under a -different group ID. - -+++ -*** New connection method "doas" for OpenBSD hosts. - -+++ -*** New connection method "gdrive", which allows to access Google -Drive onsite repositories. - -+++ -*** Gateway methods in Tramp have been removed. -Instead, the Tramp manual documents how to configure ssh and PuTTY -accordingly. - -+++ -*** Setting the "ENV" environment variable in -'tramp-remote-process-environment' enables reading of shell -initialization files. - ---- -*** Tramp is able now to send SIGINT to remote asynchronous processes. - ---- -*** Variable 'tramp-completion-mode' is obsoleted. - ---- -** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'. - -** JS mode - ---- -*** JS mode now sets 'comment-multi-line' to t. - ---- -*** New variable 'js-indent-align-list-continuation', when set to nil, -will not align continuations of bracketed lists, but will indent them -by the fixed width 'js-indent-level'. - -** CSS mode - ---- -*** Support for completing attribute values, at-rules, bang-rules, -HTML tags, classes and IDs using the 'completion-at-point' command. -Completion candidates for HTML classes and IDs are retrieved from open -HTML mode buffers. - ---- -*** CSS mode now binds 'C-h S' to a function that will show -information about a CSS construct (an at-rule, property, pseudo-class, -pseudo-element, with the default being guessed from context). By -default the information is looked up on the Mozilla Developer Network, -but this can be customized using 'css-lookup-url-format'. - ---- -*** CSS colors are fontified using the color they represent as the -background. For instance, #ff0000 would be fontified with a red -background. - -+++ -** Emacs now supports character name escape sequences in character and -string literals. The syntax variants \N{character name} and -\N{U+code} are supported. - -+++ -** Prog mode has some support for multi-mode indentation. -This allows better indentation support in modes that support multiple -programming languages in the same buffer, like literate programming -environments or ANTLR programs with embedded Python code. - -A major mode can provide indentation context for a sub-mode through -the 'prog-indentation-context' variable. To support this, modes that -provide indentation should use 'prog-widen' instead of 'widen' and -'prog-first-column' instead of a literal zero. See the node -"Mode-Specific Indent" in the ELisp manual for more details. - -** ERC - ---- -*** New variable 'erc-default-port-tls' used to connect to TLS IRC -servers. - -** URL - -+++ -*** The new function 'url-cookie-delete-cookie' can be used to -programmatically delete all cookies, or cookies from a specific -domain. - -+++ -*** 'url-retrieve-synchronously' now takes an optional timeout parameter. - ---- -*** The URL package now support HTTPS over proxies supporting CONNECT. - -+++ -*** 'url-user-agent' now defaults to 'default', and the User-Agent -string is computed dynamically based on 'url-privacy-level'. - -** VC and related modes - ---- -*** The VC state indicator in the mode line now defaults to more -colorful faces to make it more obvious to the user what the state is. -See the 'vc-faces' customization group. - -+++ -*** 'vc-dir-mode' now binds 'vc-log-outgoing' to 'O'; and has various -branch-related commands on a keymap bound to 'B'. - -** CC mode - ---- -*** Opening a .h file will turn C or C++ mode depending on language used. -This is done with the help of 'c-or-c++-mode' function which analyses -contents of the buffer to determine whether it's a C or C++ source -file. - ---- -** New DNS mode command 'dns-mode-ipv6-to-nibbles' to convert IPv6 addresses -to a format suitable for reverse lookup zone files. - -** Ispell - -+++ -*** Enchant is now supported as a spell-checker. - -Enchant is a meta-spell-checker that uses providers -such as Hunspell to do the actual checking. With it, users can use -spell-checkers not directly supported by Emacs, such as Voikko, Hspell -and AppleSpell, more easily share personal word-lists with other -programs, and configure different spelling-checkers for different -languages. (Version 2.1.0 or later of Enchant is required.) - -** Flymake - -+++ -*** Emacs no longer prompts the user before killing Flymake processes on exit. +*** New variable 'xterm-set-window-title' controls whether Emacs +sets the XTerm window title. The default is to set the window title. -* New Modes and Packages in Emacs 26.1 - -** New Elisp data-structure library 'radix-tree'. - -** New library 'xdg' with utilities for some XDG standards and specs. - -** HTML - -+++ -*** A new submode of 'html-mode', 'mhtml-mode', is now the default -mode for *.html files. This mode handles indentation, -fontification, and commenting for embedded JavaScript and CSS. - -** New mode 'conf-toml-mode' is a sub-mode of conf-mode, specialized - for editing TOML files. - -** New mode 'conf-desktop-mode' is a sub-mode of conf-unix-mode, -specialized for editing freedesktop.org desktop entries. - -** New minor mode 'pixel-scroll-mode' provides smooth pixel-level scrolling. - -** New major mode 'less-css-mode' (a minor variant of 'css-mode') for -editing Less files. +* New Modes and Packages in Emacs 27.1 -* 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. - ---- -** The alist 'ucs-names' is now a hash table. - ---- -** 'if-let' and 'when-let' are subsumed by 'if-let*' and 'when-let*'. -The incumbent 'if-let' and 'when-let' are now marked obsolete. -'if-let*' and 'when-let*' do not accept the single tuple special case. -New macro 'and-let*' is an implementation of the Scheme SRFI-2 syntax -of the same name. 'if-let*' and 'when-let*' now accept the same -binding syntax as 'and-let*'. - ---- -** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term -mode to send the same escape sequences that xterm does. This makes -things like forward-word in readline work. - ---- -** 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.' - ---- -** 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' no longer affects the treatment -of curved quotes in format arguments to functions like 'message' and -'format-message'. 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. - ---- -** To avoid confusion caused by "smart quotes", the reader no longer -accepts Lisp symbols which begin with the following quotation -characters: ‘’‛“”‟〞＂＇, unless they are escaped with backslash. - -+++ -** '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. +* Incompatible Lisp Changes in Emacs 27.1 -+++ -** '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. +** The FILENAME argument to 'file-name-base' is now mandatory and no +longer defaults to 'buffer-file-name'. --- - ** 'eldoc-message' only accepts one argument now. 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. + ** 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. -* 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'. - -** Checksum/Hash - -+++ -** 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. - -+++ -** 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. - -+++ -** 'save-some-buffers' now uses 'save-some-buffers-default-predicate' -to decide which buffers to ask about, if the PRED argument is nil. -The default value of 'save-some-buffers-default-predicate' is nil, -which means ask about all file-visiting buffers. - ---- -** string-(to|as|make)-(uni|multi)byte are now declared obsolete. - -+++ -** New variable 'while-no-input-ignore-events' which allow -setting which special events 'while-no-input' should ignore. -It is a list of symbols. - ---- -** New function 'undo-amalgamate-change-group' to get rid of -undo-boundaries between two states. - ---- -** New var 'definition-prefixes' is a hash table mapping prefixes to -the files where corresponding definitions can be found. This can be -used to fetch definitions that are not yet loaded, for example for -'C-h f'. - ---- -** New var 'syntax-ppss-table' to control the syntax-table used in -'syntax-ppss'. - -+++ -** 'define-derived-mode' can now specify an :after-hook form, which -gets evaluated after the new mode's hook has run. This can be used to -incorporate configuration changes made in the mode hook into the -mode's setup. - ---- -** Autoload files can be generated without timestamps, -by setting 'autoload-timestamps' to nil. -FIXME As an experiment, nil is the current default. -If no insurmountable problems before next release, it can stay that way. - ---- -** 'gnutls-boot' now takes a parameter ':complete-negotiation' that -says that negotiation should complete even on non-blocking sockets. - ---- -** There is now a new variable 'flyspell-sort-corrections-function' -that allows changing the way corrections are sorted. - ---- -** The new command 'fortune-message' has been added, which displays -fortunes in the echo area. - -+++ -** New function 'func-arity' returns information about the argument list -of an arbitrary function. This generalizes 'subr-arity' for functions -that are not built-in primitives. We recommend using this new -function instead of 'subr-arity'. - ---- -** New function 'region-bounds' can be used in the interactive spec -to provide region boundaries (for rectangular regions more than one) -to an interactively callable function as a single argument instead of -two separate arguments region-beginning and region-end. - -+++ -** 'parse-partial-sexp' state has a new element. Element 10 is -non-nil when the last character scanned might be the first character -of a two character construct, i.e., a comment delimiter or escaped -character. Its value is the syntax of that last character. - -+++ -** 'parse-partial-sexp's state, element 9, has now been confirmed as -permanent and documented, and may be used by Lisp programs. Its value -is a list of currently open parenthesis positions, starting with the -outermost parenthesis. - ---- -** 'read-color' will now display the color names using the color itself -as the background color. - ---- -** The function 'redirect-debugging-output' now works on platforms -other than GNU/Linux. - -+++ -** The new function 'string-version-lessp' compares strings by -interpreting consecutive runs of numerical characters as numbers, and -compares their numerical values. According to this predicate, -"foo2.png" is smaller than "foo12.png". - ---- -** Numeric comparisons and 'logb' no longer return incorrect answers -due to internal rounding errors. For example, (< most-positive-fixnum -(+ 1.0 most-positive-fixnum)) now correctly returns t on 64-bit hosts. - ---- -** The functions 'ffloor', 'fceiling', 'ftruncate' and 'fround' now -accept only floating-point arguments, as per their documentation. -Formerly, they quietly accepted integer arguments and sometimes -returned nonsensical answers, e.g., (< N (ffloor N)) could return t. - ---- -** On hosts like GNU/Linux x86-64 where a 'long double' fraction -contains at least EMACS_INT_WIDTH - 3 bits, 'format' no longer returns -incorrect answers due to internal rounding errors when formatting -Emacs integers with %e, %f, or %g conversions. For example, on these -hosts (eql N (string-to-number (format "%.0f" N))) now returns t for -all Emacs integers N. - ---- -** Calls that accept floating-point integers (for use on hosts with -limited integer range) now signal an error if arguments are not -integral. For example (decode-char 'ascii 0.5) now signals an error. - -+++ -** 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'. - -+++ -** 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 of remote or mounted directories. - -+++ -** On GNU platforms when operating on a local file, 'file-attributes' -no longer suffers from a race when called while another process is -altering the filesystem. On non-GNU platforms 'file-attributes' -attempts to detect the race, and returns nil if it does so. - -+++ -** The new function 'file-local-name' can be used to specify arguments -of remote processes. - -+++ -** The new functions 'file-name-quote', 'file-name-unquote' and -'file-name-quoted-p' can be used to quote / unquote file names with -the prefix "/:". - -+++ -** The new error 'file-missing', a subcategory of 'file-error', is now -signaled instead of 'file-error' if a file operation acts on a file -that does not exist. - -+++ -** The function 'delete-directory' no longer signals an error when -operating recursively and when some other process deletes the directory -or its files before 'delete-directory' gets to them. - -+++ -*** New error type 'user-search-failed' like 'search-failed' but -avoids debugger like 'user-error'. - -+++ -** The function 'line-number-at-pos' now takes a second optional -argument 'absolute'. If this parameter is nil, the default, this -function keeps on returning the line number taking potential narrowing -into account. If this parameter is non-nil, the function ignores -narrowing and returns the absolute line number. - ---- -** The function 'color-distance' now takes a second optional argument -'metric'. When non-nil, it should be a function of two arguments that -accepts two colors and returns a number. - -** Changes in Frame and Window Handling - -+++ -*** Resizing a frame no longer runs 'window-configuration-change-hook'. -'window-size-change-functions' should be used instead. - -+++ -*** The new function 'frame-size-changed-p' can tell whether a frame has -been resized since the last time 'window-size-change-functions' has been -run. - -+++ -*** The function 'frame-geometry' now also returns the width of a -frame's outer border. - -+++ -*** New frame parameters and changed semantics for older ones - -+++ -**** 'z-group' positions a frame above or below all others. - -+++ -**** 'min-width' and 'min-height' specify the absolute minimum size of a -frame. - -+++ -**** 'parent-frame' makes a frame the child frame of another Emacs -frame. The section "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- 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' allow to specify pixel values and ratios now. - -+++ -**** 'left' and 'top' allow to specify ratios now. - -+++ -**** '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 to drag and resize frames with the mouse. - -*** 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 "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 "Atomic Windows" in the Elisp manual. - -+++ -*** New 'display-buffer' alist entry 'window-parameters' allows to -assign 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 to override the buffer-local formats for this window. - -+++ -*** 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 "Mouse Window Auto-selection" in the Elisp -manual. - ---- -** '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 a rx-style regular expression. -For details, see the doc string of 'rx--pcase-macroexpander'. - ---- -** New functions to set region from secondary selection and vice versa. -The new functions 'secondary-selection-to-region' and -'secondary-selection-from-region' let you set the beginning and the -end of the region from those of the secondary selection and vise -versa. +* Lisp Changes in Emacs 27.1 -* 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 ----------------------------------------------------------------------