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Diffstat (limited to 'etc/NEWS')
| -rw-r--r-- | etc/NEWS | 647 |
1 files changed, 603 insertions, 44 deletions
@@ -1,6 +1,6 @@ GNU Emacs NEWS -- history of user-visible changes. -Copyright (C) 2017-2018 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'. @@ -41,6 +41,12 @@ 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 @@ -63,19 +69,41 @@ 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. -** Ibuffer ++++ +** 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. ---- -*** 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. +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). -** Gnus +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 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. +** 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. + ++++ +** The configure options '--enable-checking=conslist' and +'--enable-checking=xmallocoverrun' have been withdrawn. The former +made Emacs irredeemably slow, and the latter made it crash. Neither +option was useful with modern debugging tools such as AddressSanitizer. +(See etc/DEBUG for the details of using the modern replacements of the +removed configure options.) + +--- +** Emacs now requires GTK 2.24 and GTK 3.10 for the GTK 2 and GTK 3 +builds respectively. * Startup Changes in Emacs 27.1 @@ -144,9 +172,20 @@ 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. +** Lexical binding is now used when evaluating interactive Elisp forms +More specifically, lexical-binding is now used for M-:, --eval, as well +as in the *scratch* and *ielm* buffers. + --- ** The new option 'tooltip-resize-echo-area' avoids truncating tooltip text on GUI frames when tooltips are displayed in the echo area. Instead, @@ -204,6 +243,13 @@ 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. @@ -221,6 +267,18 @@ regular expression was previously invalid, but is now accepted: --- ** 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 @@ -247,6 +305,45 @@ 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. + +--- +** New variable next-error-verbose controls when `next-error' outputs + a message about the error locus. + +--- +** New variable grep-search-path defines the directories searched for + grep hits (this used to be controlled by compilation-search-path). + +--- +** New variable emacs-lisp-compilation-search-path defines the + directories searched for byte-compiler error messages (this used to + be controlled by compilation-search-path). + +** Multicolor fonts such as "Noto Color Emoji" can be displayed on +Emacs configured with Cairo drawing and linked with cairo >= 1.16.0. + * Editing Changes in Emacs 27.1 @@ -305,9 +402,63 @@ 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 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 + +** Ido +*** New user option 'ido-big-directories' to mark directories whose +names match certain regular expressions as big. Ido won't attempt to +list the contents of such directories when completing file names. + +** 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 @@ -333,18 +484,23 @@ 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 +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', deletes the selected window and selects -the window that was in the specified direction. +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'. +*** New commands 'project-search' and 'project-query-replace-regexp'. ** Etags @@ -352,11 +508,11 @@ The mode is automatically enabled in files that start with the *** 'next-file' is now an obsolete alias of 'tags-next-file'. *** 'tags-loop-revert-buffers' is an obsolete alias of -'multifile-revert-buffers'. +'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 'multifile-initialize' and 'multifile-continue' functions +use the new 'fileloop-initialize' and 'fileloop-continue' functions instead. ** bibtex @@ -402,9 +558,33 @@ 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 default. -To disable it, set the new defcustom 'diff-font-lock-refine' to nil. ++++ +*** 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. @@ -414,6 +594,15 @@ To enable it, set the new defcustom 'diff-font-lock-prettify' to t. 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. @@ -445,27 +634,45 @@ end. ** SQL -*** Installation of 'sql-indent' from ELPA is strongly encouraged. -This package support sophisticated rules for properly indenting SQL -statements. 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. +*** 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. +**** 'sql-mode-hook' and 'sql-interactive-mode-hook' changed. Both hook variables have had 'sql-indent-enable' added to their -default values. If youhave existing customizations to these variables, +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. + ** Term --- @@ -485,6 +692,13 @@ Control whether Flymake starts checking the buffer on save. This enables more efficient backends. See the docstring of 'flymake-diagnostic-functions' or the Flymake manual for details. +** Ruby + +*** The Rubocop Flymake diagnostic function will only run Lint cops if +it can't find the config file. + +*** Rubocop is called with 'bundle exec' if Gemfile mentions it. + ** Package *** New function 'package-get-version' lets packages query their own version. @@ -521,6 +735,13 @@ mouse click event, and is intended to be bound to a mouse event. Previously, setting 'xref-marker-ring-length' would only take effect if set before 'xref.el' was loaded. +--- +*** xref-find-definitions now sets the mark at the buffer position +where it was invoked + +--- +*** New xref faces 'xref-file-header', 'xref-line-number', 'xref-match' + ** Ecomplete *** The ecomplete sorting has changed to a decay-based algorithm. @@ -531,6 +752,17 @@ Of course it will still find it if you have it in ~/.ecompleterc ** Gnus +--- +*** 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. + ++++ +*** 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. + +++ *** A prefix argument to 'gnus-summary-limit-to-score' will limit reverse. Limit to articles with score at below. @@ -572,6 +804,16 @@ and its value has been changed to Duck Duck Go. ** eww/shr ++++ +*** 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. + ++++ +*** 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. + *** 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 @@ -582,6 +824,9 @@ has been executed. If set, shr will not render tags with attribute 'aria-hidden="true"'. This attribute is meant to tell screen readers to ignore a tag. +--- +*** 'shr-tag-ol' now respects the ordered list 'start' attribute. + ** Htmlfontify *** The functions 'hfy-color', 'hfy-color-vals' and @@ -642,6 +887,9 @@ directories in the destination. ** Help --- +*** Description of variables and functions give an estimated first release + +--- *** 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 @@ -658,6 +906,11 @@ can now be searched via 'C-s'. --- *** 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') @@ -712,6 +965,9 @@ 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 +++ @@ -750,7 +1006,7 @@ been instrumented by Edebug. the XTerm window title. This feature is experimental and is disabled by default. -** grep +** Grep +++ *** rgrep, lgrep and zrgrep now hide part of the command line @@ -812,6 +1068,11 @@ default, and not just the opening element. ** Eshell +*** 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). + --- *** Expansion of history event designators is disabled by default. To restore the old behavior, use @@ -839,7 +1100,18 @@ followed when Emacs writes the relevant history variables to the disk. --- *** Program name completion inside remote shells works now as expected. ++++ +*** The variable 'shell-file-name' can be set now as connection-local +variable for remote shells. It still defaults to "/bin/sh". + +** Single shell commands + +--- +*** 'shell-command-width' defines the number of display columns +available for output of asynchronous or remote shell commands. + ** Pcomplete + *** The function 'pcomplete-uniquify-list' has been renamed from 'pcomplete-uniqify-list'. @@ -859,6 +1131,12 @@ or NextCloud hosted files and directories. storages via the 'rclone' program. This feature is experimental. +++ +*** 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. + ++++ *** Connection methods "obex" and "synce" are removed, because they are obsoleted in GVFS. @@ -876,7 +1154,8 @@ Tramp for some look-alike remote file names. +++ *** For some connection methods, like "su" or "sudo", the host name in -ad-hoc multi-hop file names must match the previous hop. +ad-hoc multi-hop file names must match the previous hop. Default host +names are adjusted to the host name from the previous hop. +++ *** For the connection methods "sudo" and "doas" there exists a @@ -991,10 +1270,133 @@ subexpression. When there is no menu for a mode, display the mode name after the indicator instead of just the indicator (which is sometimes cryptic). +** rx + +--- +*** 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. + +** Frames + ++++ +*** New command 'make-frame-on-monitor' makes a frame on the specified monitor. + ++++ +*** 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 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. + +** Tabulated List mode + ++++ +*** 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'). + +** Text mode + ++++ +*** 'text-mode-variant' is now obsolete, use 'derived-mode-p' instead. + +** CUA mode + +--- +*** New defcustom 'cua-rectangle-terminal-modifier-key'. +This defcustom allows for the customization of the modifier key used +in a terminal frame. + +** JS mode + +--- +*** 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. + * New Modes and Packages in Emacs 27.1 -** multifile.el lets one setup multifile operations like search&replace. +** fileloop.el lets one setup multifile operations like search&replace. +++ ** Emacs can now visit files in archives as if they were directories. @@ -1021,6 +1423,9 @@ 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. @@ -1072,6 +1477,10 @@ old-style backquotes as new-style, bind the new variable 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, @@ -1118,11 +1527,41 @@ they are now allocated like any other pseudovector. As a result, the '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). + +** 'make-process' no longer accepts a non-nil ':stop' key. This has +never worked reliably, and now causes an error. + * Lisp Changes in Emacs 27.1 +** New 'help-fns-describe-variable-functions' hook. +Makes it possible to add metadata information to describe-variable. + +** 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 +** 'self-insert-command' takes the char to insert as (optional) argument. ** 'lookup-key' can take a list of keymaps as argument. @@ -1187,6 +1626,12 @@ 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. +++ @@ -1234,9 +1679,43 @@ displaying the same buffer. See the node "(elisp) Face Remapping" of the Emacs Lisp Reference manual for more detail. +++ -** Special handling of buffer-local 'window-size-change-functions'. -A buffer-local value of this hook is now run only if at least one -window showing the buffer has changed its size. +** 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'. @@ -1255,10 +1734,10 @@ between two strings. '(quote x)' instead of 'x you will have to bind it to nil where applicable. +++ -** Numbers formatted via '%o' or '%x' may now be formatted as signed integers. +** 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, a planned feature. To get this -behavior, set the experimental variable 'binary-as-unsigned' to nil, +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. @@ -1347,6 +1826,18 @@ 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 --- @@ -1376,6 +1867,13 @@ left to higher-level functions. 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. @@ -1395,6 +1893,50 @@ 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. + +** New module environment functions 'make_time' and 'extract_time' to +convert between timespec structures and Emacs Lisp time values. + +** New module environment functions 'make_big_integer' and +'extract_big_integer' to create and extract arbitrary-size integer +values. + * Changes in Emacs 27.1 on Non-Free Operating Systems @@ -1428,6 +1970,23 @@ 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. + +** On NS multicolor font display is enabled again since it is also +implemented in Emacs on free operating systems via Cairo drawing. + ---------------------------------------------------------------------- This file is part of GNU Emacs. |