This file is about changes in Emacs version 25.
+See file HISTORY for a list of GNU Emacs versions and release dates.
See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
and NEWS.1-17 for changes in older Emacs versions.
+++
** Building Emacs now requires C99 or later.
++++
** Building Emacs now requires GNU make, version 3.81 or later.
++++
** New configure option --with-cairo.
-Maybe add text based on http://lists.gnu.org/archive/html/emacs-devel/2015-05/msg00689.html
+This builds Emacs with Cairo drawing. As a side effect, it provides
+support for built-in printing, when Emacs was built with GTK+.
** By default, Emacs no longer works on IRIX. We expect that Emacs
users are not affected by this, as SGI stopped supporting IRIX in
undumping code to GCC under IRIX, or by configuring --with-wide-int,
or by sticking with Emacs 24.4.
+** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
+The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
+since Emacs 24.4, and the other variants were undocumented and were
+obstacles to maintenance and development. GC_MARK_STACK and its
+related symbols have been removed from the C internals.
+
** 'configure' now prefers gnustep-config when configuring GNUstep.
If gnustep-config is not available, the old heuristics are used.
It has no particular connection to Emacs and has not changed in years,
so if you want to use it, you can always take a copy from an older Emacs.
+** Emacs 25 comes with a new set of icons.
+Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
+The old Emacs logo icons are available as `emacs23.png' in the same location.
+
\f
* Startup Changes in Emacs 25.1
and *Buffer List*. This makes Emacs convenient to use from the
command line when `initial-buffer-choice' is non-nil.
++++
+** The value of ‘initial-scratch-message’ is now treated as a doc string
+and can contain escape sequences for command keys, quotes, and the like.
+
\f
* Changes in Emacs 25.1
-** New display-buffer action function display-buffer-use-some-frame
+** Any file of the form .dir-locals*.el is now considered a dir-local
+ file, and multiple can be used in the same directory. See the
+ variable `dir-locals-file' for more information.
+** `xref-find-definitions' and `describe-function' now display
+ information about mode local overrides (defined by
+ cedet/mode-local.el `define-overloadable-function' and
+ `define-mode-local-overrides').
+
+** New `display-buffer' action function `display-buffer-use-some-frame'
This displays the buffer in an existing frame other than the current
frame, and allows the caller to specify a frame predicate to exclude
frames.
** New doc command `describe-symbol'. Works for functions, vars, faces, etc...
+** New user option `search-default-regexp-mode' specifies the default mode for isearch
+
** `isearch' and `query-replace' now perform character folding in matches.
This is analogous to case-folding, but applies between Unicode
-characters and their ASCII counterparts. This means many characters
+characters and their ASCII counterparts. This means many characters
will match entire groups of characters.
For instance, the " will match all variants of unicode double quotes
cousins, even those composed of multiple characters, as well as many
other symbols like ℀, ℁, ⒜, and ⓐ.
-** New function `character-folded-regexp' can be used
-by searching commands to produce a a regexp matching anything that
+** New function `character-fold-to-regexp' can be used
+by searching commands to produce a regexp matching anything that
character-folds into STRING.
** New command `checkdoc-package-keywords' checks if the
-current package keywords are recognized. Set the new option
+current package keywords are recognized. Set the new option
`checkdoc-package-keywords-flag' to non-nil to make
`checkdoc-current-buffer' call this function automatically.
** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
€ № ← → ↔ − ≈ ≠ ≤ ≥. As before, you can type C-x 8 C-h to list shorthands.
-** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”.
+** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
+as you type. See also the new variable ‘text-quoting-style’.
** New minor mode global-eldoc-mode is enabled by default.
\f
* Changes in Specialized Modes and Packages in Emacs 25.1
+** New function `bookmark-set-no-overwrite' bound to C-x r M.
+It raises an error if a bookmark of that name already exists,
+unlike `bookmark-set' which silently updates an existing bookmark.
+
+** JSON
+---
+*** `json-pretty-print' and `json-pretty-print-buffer' now maintain
+the ordering of object keys by default.
+---
+*** New commands `json-pretty-print-ordered' and
+`json-pretty-print-buffer-ordered' pretty prints JSON objects with
+object keys sorted alphabetically.
+
+** You can recompute the VC state of a file buffer with `M-x vc-refresh-state'
** Prog mode has some support for multi-mode indentation.
See `prog-indentation-context' and `prog-widen'.
-** Prettify Symbols mode supports custom composition predicates. By
+** Prettify Symbols mode
+*** Prettify Symbols mode supports custom composition predicates. By
overriding the default `prettify-symbols-compose-predicate', modes can
specify in which contexts a symbol map be composed to some unicode
character. `prettify-symbols-default-compose-p' is the default which
is suitable for most programming languages such as C or Lisp (but not
(La)TeX).
+*** Symbols can be unprettified while point is inside them.
+New variable `prettify-symbols-unprettify-at-point' configures this.
+
** New `xterm-screen-extra-capabilities' config.
** The `save-place' variable is replaced by a `save-place-mode'.
** ERC
-*** Hide message types by network or channel. `erc-hide-list' will
+*** Hide message types by network or channel. `erc-hide-list' will
hide all messages of the specified type, where `erc-network-hide-list'
and `erc-channel-hide-list' will only hide the specified message types
for the respective specified targets.
*** If a package is available on multiple archives and one has higher
priority (as per `package-archive-priorities') only that one is
-listed. This can be configured with `package-menu-hide-low-priority'.
+listed. This can be configured with `package-menu-hide-low-priority'.
*** `package-menu-toggle-hiding' now toggles the hiding of packages.
This includes the above-mentioned low-priority packages, as well as
*** New custom variable `package-selected-packages' tracks packages
which were installed by the user (as opposed to installed as
-dependencies). This variable can also be manually customized.
+dependencies). This variable can also be manually customized.
*** New command `package-install-user-selected-packages' installs all
packages from `package-selected-packages' which are currently missing.
(add-to-list 'display-buffer-alist
'("^\\*shell\\*$" . (display-buffer-same-window))).
-
** EIEIO
+++
*** The `:protection' slot option is not obeyed any more.
*** If `quick-calc' is called with a prefix argument, insert the
result of the calculation into the current buffer.
++++
+** In Edebug, you can now set the initial mode with C-x C-a C-m. With
+this you can tell Edebug not to stop at the start of the first
+instrumented function.
+
** ElDoc
*** New minor mode `global-eldoc-mode'
*** `eldoc-documentation-function' now defaults to `ignore'
** cl-lib
*** New functions cl-fresh-line, cl-digit-char-p and cl-parse-integer.
-** seq
-*** New seq library:
-The seq library adds sequence manipulation functions and macros that
-complement basic functions provided by subr.el. All functions are
-prefixed with `seq-' and work on lists, strings and vectors.
-
-** map
-*** New map library:
-The map library provides map-manipulation functions that work on alists,
-hash-table and arrays. All functions are prefixed with "map-".
-
** Calendar and diary
+++
** SES now supports local printer functions; see `ses-define-local-printer'.
-** In sh-mode, you can now use `sh-shell' as a file-local variable to
+** sh-script
+*** In sh-mode you can now use `sh-shell' as a file-local variable to
specify the type of shell in use (bash, csh, etc).
+*** New value `always' for sh-indent-after-continuation.
+This provides old-style ("dumb") indentation of continued lines.
+
** TLS
---
*** Fatal TLS errors are now silent by default.
** Tramp
++++
+*** New connection method "afp", which allows to access Mac OS X
+volumes via the Apple Filing Protocol.
+
++++
*** New connection method "nc", which allows to access dumb busyboxes.
++++
*** Method-specific parameters can be overwritten now with variable
`tramp-connection-properties'.
+---
+*** Handler for `file-notify-valid-p' for remote machines that support
+filesystem notifications.
+
** SQL mode
*** New user variable `sql-default-directory' enables remote
interactive macro evaluation and automatic scanning of #defined symbols.
*** New custom variable `hide-ifdef-header-regexp' to define C/C++ header file
-name patterns. Default case-insensitive .h, .hh, .hpp and .hxx.
+name patterns. Default case-insensitive .h, .hh, .hpp, .hxx, and .h++.
*** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
reinclusion protected header files from being fully hidden.
*** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
-name patterns (e.x. all "FOR_DOXYGEN_ONLY_*") to be excluded.
+name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be excluded.
** TeX mode
** tar-mode: new `tar-new-entry' command, allowing for new members to
be added to the archive.
+---
** Autorevert: dired buffers are also auto-reverted via file
notifications, if Emacs is compiled with file notification support.
+** File Notifications
+
++++
+*** The new event `stopped' signals, that a file notification watch is
+not active any longer.
+
++++
+*** The new function `file-notify-valid-p' checks, whether a file
+notification descriptor still corresponds to an activate watch.
+
+** Dired
+
++++
+*** The command `dired-do-compress' bound to `Z' now can compress
+directories and decompress zip files.
+
++++
+*** New command `dired-do-compress-to' bound to `c' can be used to
+compress many marked files into a single named archive. The
+compression command is determined from the new
+`dired-compress-files-alist' variable.
+
** Obsolete packages
---
*** landmark.el (moved to elpa.gnu.org)
-+++
-** The character classes [:graph:] and [:print:] in regular expressions
-no longer match every multibyte character. Instead, Emacs now
-consults the Unicode character properties to determine which
-characters are graphic or printable. In particular, surrogates and
-unassigned codepoints are now rejected. If you want the old behavior,
-use [:multibyte:] instead.
-
\f
* New Modes and Packages in Emacs 25.1
forbidden by Czech and Polish typography (and may be discouraged in
other languages), so `auto-tildify-mode' makes it easier to create
a typographically-correct documents.
+
+** The `seq' library adds sequence manipulation functions and macros
+that complement basic functions provided by subr.el. All functions
+are prefixed with `seq-' and work on lists, strings and vectors.
+
+** The `map' library provides map-manipulation functions that work on
+alists, hash-table and arrays. All functions are prefixed with
+`map-'.
+
+** The `thunk' library provides functions and macros to control the
+evaluation of forms.
+
+** js-jsx-mode (a minor variant of js-mode) provides indentation
+support for JSX, an XML-like syntax extension to ECMAScript.
+
\f
* Incompatible Lisp Changes in Emacs 25.1
+** `syntax-begin-function' is declared obsolete.
+Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
+slot in font-lock-defaults.
+
++++
+** `package-initialize' now sets `package-enable-at-startup' to nil if
+called during startup. Users who call this function in their init
+file and still expect it to be run after startup should set
+`package-enable-at-startup' to t after the call to
+`package-initialize'.
+
** `:global' minor mode use `setq-default' rather than `setq'.
This means that you can't use `make-local-variable' and expect them to
"magically" become buffer-local.
denied" instead of "permission denied". The old behavior was problematic
in languages like German where downcasing rules depend on grammar.
++++
+** New variable ‘text-quoting-style’ to control how Emacs translates quotes.
+Set it to ‘curve’ for curved single quotes ‘like this’, to ‘straight’
+for straight apostrophes 'like this', and to ‘grave’ for grave accent
+and apostrophe `like this'. The default value nil acts like ‘curve’
+if curved single quotes are displayable, and like ‘grave’ otherwise.
+The new variable affects display of diagnostics and help, but not of info.
+
+++
** substitute-command-keys now replaces quotes.
-That is, it converts documentation strings' quoting style as per the
+That is, it converts documentation strings’ quoting style as per the
value of ‘text-quoting-style’. Doc strings in source code can use
-either curved quotes or grave accent and apostrophe. As before,
-isolated apostrophes and characters preceded by \= are output as-is.
+either curved single quotes or grave accents and apostrophes. As
+before, characters preceded by \= are output as-is.
+++
** Message-issuing functions ‘error’, ‘message’, etc. now convert quotes.
They use the new ‘format-message’ function instead of plain ‘format’,
-so that they now follow user preference as per ‘text-quoting-style’ if
-their format argument contains curved quotes.
+so that they now follow user preference as per ‘text-quoting-style’
+when processing curved single quotes, grave accents, and apostrophes
+in their format argument.
+++
** The character classes [:alpha:] and [:alnum:] in regular expressions
If you want the old behavior where they matched any character with
word syntax, use `\sw' instead.
++++
+** The character classes [:graph:] and [:print:] in regular expressions
+no longer match every multibyte character. Instead, Emacs now
+consults the Unicode character properties to determine which
+characters are graphic or printable. In particular, surrogates and
+unassigned codepoints are now rejected. If you want the old behavior,
+use [:multibyte:] instead.
+
+++
** The `diff' command uses the unified format now. To restore the old
behavior, set `diff-switches' to `-c'.
-** `grep-template' and `grep-find-template' values don't include the
---color argument anymore. It's added at the <C> place holder position
-dynamically.
-
** `grep-template' and `grep-find-template' values don't include the
--color argument anymore. It's added at the <C> place holder position
dynamically. Any third-party code that changes these templates should
be updated accordingly.
++++
+** ‘(/ N)’ is now equivalent to ‘(/ 1 N)’ rather than to ‘(/ N 1)’.
+The new behavior is compatible with Common Lisp and with XEmacs.
+This change does not affect Lisp code intended to be portable to
+Emacs 24.2 and earlier, which did not support unary ‘/’.
+
++++
+** The `default-directory' value doesn't have to end slash. To make
+that happen, `unhandled-file-name-directory' now defaults to calling
+`file-name-as-directory'.
+
\f
* Lisp Changes in Emacs 25.1
+** syntax-propertize is now automatically called on-demand during forward
+parsing functions like `forward-sexp'.
+
+** New hooks prefix-command-echo-keystrokes-functions and
+prefix-command-preserve-state-hook, to allow the definition of prefix
+commands other than the predefined C-u.
+
** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
** The default value of `load-read-function' is now `read'.
+++
** New function ‘format-message’ is like ‘format’ and also converts
-curved quotes as per ‘text-quoting-style’.
-
-+++
-** New ‘format’ flag ‘q’
-The new ‘q’ flag causes ‘format’ to quote the output representation as
-per the value of ‘text-quoting-style’. E.g., (format "%qs failed"
-"foo") might return "‘foo’ failed".
+curved single quotes, grave accents and apostrophes as per
+‘text-quoting-style’.
+++
** show-help-function's arg is converted via substitute-command-keys
** New function `set-binary-mode' allows to switch a standard stream
of the Emacs process to binary I/O mode.
-** In locales that cannot display curved quotes, ASCII approximations
-are installed in standard-display-table.
+** ASCII approximations to curved quotes are put in standard-display-table
+if the terminal cannot display curved quotes.
** Standard output and error streams now transliterate characters via
standard-display-table, and encode output using locale-coding-system.