GNU Emacs NEWS -- history of user-visible changes.
-Copyright (C) 2014-2015 Free Software Foundation, Inc.
+Copyright (C) 2014-2016 Free Software Foundation, Inc.
See the end of the file for license conditions.
Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
** 'configure' detects the kqueue file notification library on *BSD
and Mac OS X machines.
+\f
+* Startup Changes in Emacs 25.2
+
+\f
+* Changes in Emacs 25.2
+
+** It is possible to disable attempted recovery on fatal signals
+
+Two new variables allow to disable 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.
+
+\f
+* Editing Changes in Emacs 25.2
+
\f
* Changes in Specialized Modes and Packages in Emacs 25.2
*** The kqueue library is integrated for *BSD and Mac OS X machines.
+** Tramp
+
+*** New connection method "sg", which allows to edit files under
+different group ID.
+
+\f
+* New Modes and Packages in Emacs 25.2
+
+\f
+* Incompatible Lisp Changes in Emacs 25.2
+
+\f
+* Lisp Changes in Emacs 25.2
+
+** New var syntax-ppss-table to control the syntax-table used in syntax-ppss
+
+** Autoload files can be generated without timestamps,
+by setting `autoload-timestamps' to nil.
+
+\f
+* Changes in Emacs 25.2 on Non-Free Operating Systems
+
\f
* Installation Changes in Emacs 25.1
+++
** 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+.
+
++++
+** New configure option --with-modules.
+This enables support for loading dynamic modules; see below.
+---
** By default, Emacs no longer works on IRIX. We expect that Emacs
users are not affected by this, as SGI stopped supporting IRIX in
December 2013. If you are affected, please send a bug report. You
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.
This affects only the 'movemail' utility; Emacs itself can still
process MMDF-format files as before.
++++
** The configure option '--enable-silent-rules' is now the default,
and silent rules are now quieter. To get the old behavior where
'make' chatters a lot, configure with '--disable-silent-rules' or
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.
+---
+** New make target `check-expensive' to run additional tests.
+This includes all tests which run via "make check", plus additional
+tests which take more time to perform.
+
\f
* Startup Changes in Emacs 25.1
\f
* Changes in Emacs 25.1
-** 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
-will match entire groups of characters.
-
-For instance, the " will match all variants of unicode double quotes
-(like “ and ”), and the letter a will match all of its accented
-cousins, even those composed of multiple characters, as well as many
-other symbols like ℀, ℁, ⒜, and ⓐ.
-
-** 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
-`checkdoc-package-keywords-flag' to non-nil to make
-`checkdoc-current-buffer' call this function automatically.
-
-** New function `checkdoc-file' checks for style errors.
-It's meant for use together with `compile':
-emacs -batch --eval "(checkdoc-file \"subr.el\")"
-
-** New command `comment-line' bound to `C-x C-;'.
++++
+** Emacs can now load shared/dynamic libraries (modules).
+A dynamic Emacs module is a shared library that provides additional
+functionality for use in Emacs Lisp programs, just like a package
+written in Emacs Lisp would. The functions `load', `require',
+`load-file', etc. were extended to load such modules, as they do with
+Emacs Lisp packages. The new variable `module-file-suffix' holds the
+system-dependent value of the file-name extension (`.so' on Posix
+hosts) of the module files.
+
+A module should export a C-callable function named
+`emacs_module_init', which Emacs will call as part of the call to
+`load' or `require' which loads the module. It should also export a
+symbol named `plugin_is_GPL_compatible' to indicate that its code is
+released under the GPL or compatible license; Emacs will refuse to
+load modules that don't export such a symbol.
+
+If a module needs to call Emacs functions, it should do so through the
+API defined and documented in the header file `emacs-module.h'. Note
+that any module that provides Lisp-callable functions will have to use
+Emacs functions such as `fset' and `funcall', in order to register its
+functions with the Emacs Lisp interpreter.
+
+Modules can create `user-ptr' Lisp objects that embed pointers to C
+struct's defined by the module. This is useful for keeping around
+complex data structures created by a module, to be passed back to the
+module's functions. User-ptr objects can also have associated
+"finalizers" -- functions to be run when the object is GC'ed; this is
+useful for freeing any resources allocated for the underlying data
+structure, such as memory, open file descriptors, etc. A new
+predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
+object.
+
+Loadable modules in Emacs are an experimental feature, and subject to
+change in future releases. For that reason, their support is disabled
+by default, and must be enabled by using the `--with-modules' option
+at configure time.
-** New function `custom-prompt-customize-unsaved-options' checks for
-unsaved customizations and prompts user to customize (if found).
++++
+** Any file of the form .dir-locals*.el is now considered a dir-local
+file, and multiple such files can be used in the same directory. See
+the variable `dir-locals-file' for more information.
+++
** Network security (TLS/SSL certificate validity and the like) is
puny.el library, so that one can visit web sites like
"http://méxico.icom.museum".
++++
** C-h l now also lists the commands that were run.
** The new M-s M-w key binding uses eww to search the web for the
have the equivalent of a primary selection.
+++
-** terpri gets an optional arg ENSURE to conditionally output a newline.
+** New option `switch-to-buffer-in-dedicated-window' allows to customize
+how `switch-to-buffer' proceeds interactively when the selected window
+is strongly dedicated to its buffer.
+++
-** New macro `define-advice'.
+** The option `even-window-heights' has been renamed to
+`even-window-sizes' and now handles window widths as well.
++++
+** terpri gets an optional arg ENSURE to conditionally output a newline.
+
++++
** `insert-register' now leaves point after the inserted text
when called interactively. A prefix argument toggles this behavior.
-** New var `truncate-string-ellipsis' to choose how to indicate truncation.
-
+++
** The new variable `term-file-aliases' replaces some files from lisp/term.
The function `tty-run-terminal-initialization' consults this variable
hiding character but the default `.' can be used by let-binding the
variable `read-hide-char'.
-** The new functions `string-collate-lessp' and `string-collate-equalp'
-preserve the collation order as defined by the system's locale(1)
-environment. For the time being this is implemented for modern POSIX
-systems and for MS-Windows, for other systems they fall back to their
-counterparts `string-lessp' and `string-equal'.
-
-*** The ls-lisp package uses `string-collate-lessp' to sort file names.
-If you want the old, locale-independent sorting, customize the new
-option `ls-lisp-use-string-collate' to a nil value.
-
-*** The MS-Windows specific variable `w32-collate-ignore-punctuation',
-if set to a non-nil value, causes the above 2 functions to ignore
-symbol and punctuation characters when collating strings. This
-emulates the behavior of modern Posix platforms when the locale's
-codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
-MS-Windows doesn't support UTF-8 as codeset in its locales.
-
-+++
-** The new function `bidi-find-overridden-directionality' allows to
-find characters whose directionality was, perhaps maliciously,
-overridden by directional override control characters. Lisp programs
-can use this to detect potential phishing of URLs and other links that
-exploits bidirectional display reordering.
-
-+++
-** The new function `buffer-substring-with-bidi-context' allows to
-copy a portion of a buffer into a different location while preserving
-the visual appearance both of the copied text and the text at
-destination, even when the copied text includes mixed bidirectional
-text and directional control characters.
-
-** New variable `ns-use-fullscreen-animation' controls animation for
-non-native NS fullscreen. The default is nil. Set to t to enable
-animation when entering and leaving fullscreen. For native OSX fullscreen
-this has no effect.
-
-** A new text property `inhibit-read-only' can be used in read-only
-buffers to allow certain parts of the text to be writable.
-
-** A new function `directory-files-recursively' returns all matching
-files (recursively) under a directory.
+---
+** New input methods: `tamil-dvorak' and `programmer-dvorak'.
-** The new function `directory-name-p' can be used to check whether a file
-name (as returned from, for instance, `file-name-all-completions' is
-a directory file name. It returns non-nil if the last character in
-the name is a forward slash.
+\f
+* Editing Changes in Emacs 25.1
+++
-** New variable `fast-but-imprecise-scrolling' inhibits
-fontification during full screen scrolling operations, giving less
-hesitant operation during auto-repeat of C-v, M-v at the cost of
-possible inaccuracies in the end position.
-
-** The function `font-info' now returns more details about a font.
-In particular, it now returns the average width of the font's
-characters, which can be used for geometry-related calculations.
-
-** A new function `default-font-width' returns the average width of a
-character in the current buffer's default font. If the default face
-is remapped (see `face-remapping-alist'), the value for the remapped
-face is returned. This function complements the existing function
-`default-font-height'.
-
-** New functions `window-font-height' and `window-font-width' return
-the height and average width of characters in a specified face and
-window. If FACE is remapped (see `face-remapping-alist'), the
-function returns the information for the remapped face.
-
-** A new function `window-max-chars-per-line' returns the maximal
-number of characters that can be displayed on one line. If a face
-and/or window are provided, these values are used for the
-calculation. This function is different from `window-body-width' in
-that it accounts for (i) continuation glyphs, (ii) the size of the
-font, and (iii) the specified window.
+** M-x suggests shorthands and ignores obsolete commands for completion.
-** New possible value for `system-type': nacl.
+** Changes in undo
+++
-** New variable `inhibit-message', when bound to non-nil, inhibits
- `message' and related functions from displaying messages the Echo
- Area. The output is still logged to the *Messages* buffer.
+*** Successive single-char deletions are collapsed in the undo-log just like
+successive char insertions. Which commands invoke this behavior is
+controlled by the new `undo-auto-amalgamate' function. See the node
+"Undo" in the ELisp manual for more details.
+++
-** It is now safe for a mode that derives `tabulated-list-mode' to not
-call `tabulated-list-init-header', in which case it will have no
-header.
+*** The heuristic used to insert `undo-boundary' after each command
+has changed, so that if a command causes changes in more than just the
+current buffer, Emacs now calls `undo-boundary' in every buffer
+affected by the command.
+++
-** `tabulated-list-print' takes a second optional argument, update,
-which specifies an alternative printing method which is faster when
-few or no entries have changed.
-
-\f
-* Editing Changes in Emacs 25.1
+** New command `comment-line' bound to `C-x C-;'.
-** Successive single-char deletions are collapsed in the undo-log just like
-successive char insertions.
+** New and improved facilities for inserting Unicode characters
-** Unicode names entered via C-x 8 RET now use substring completion by default.
+---
+*** Unicode names entered via C-x 8 RET now use substring completion by default.
-** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
++++
+*** 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.
+---
** Emacs now supports "bracketed paste mode" when running on a terminal
that supports it. This facility allows Emacs to understand pasted
chunks of text as strings to be inserted, instead of interpreting each
paste experience similar to that under a window system, and significant
performance improvements when pasting large amounts of text.
++++
** Emacs now supports the latest version of the UBA.
The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
was updated to support all the latest additions and changes introduced
Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
standards.
++++
** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
+++
** New buffer-local `electric-pair-local-mode'.
++++
+** New variable `fast-but-imprecise-scrolling' inhibits
+fontification during full screen scrolling operations, giving less
+hesitant operation during auto-repeat of C-v, M-v at the cost of
+possible inaccuracies in the end position.
+
++++
+** New documentation command `describe-symbol'.
+Works for functions, variables, faces, etc. It is bound to `C-h o' by
+default.
+
++++
+** New function `custom-prompt-customize-unsaved-options' checks for
+unsaved customizations and prompts user to customize (if found). It
+is intended for adding to 'kill-emacs-query-functions'.
+
\f
* Changes in Specialized Modes and Packages in Emacs 25.1
+** Checkdoc
+
++++
+*** New command `checkdoc-package-keywords' checks if the
+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.
+
++++
+*** New function `checkdoc-file' checks for style errors.
+It's meant for use together with `compile':
+emacs -batch --eval "(checkdoc-file \"subr.el\")"
+
+** Desktop
+
+---
+*** The desktop format version has been upgraded from 206 to 208.
+Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
+cannot read a version 208 desktop. To upgrade your desktop file, you
+must explicitly request the upgrade, by C-u M-x desktop-save. You are
+recommended to do this as soon as you have firmly upgraded to Emacs
+25.1 (or later). Should you ever need to downgrade your desktop file
+to version 206, you can do this with C-u C-u M-x desktop-save.
+
++++
** 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.
+** IMAP
+
+---
+*** `imap-ssl-program' has been removed, and imap.el uses the internal
+GnuTLS encryption functions if possible.
+
** 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'.
+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.
** 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
+specify in which contexts a symbol may be displayed as 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.
+** Enhanced xterm support
+
+---
+*** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
+This variable tells Emacs which advanced capabilities are available in
+the xterm terminal emulator used to display Emacs text-mode frames.
+The default is to check each capability, and use it if available.
+(This variable was introduced in Emacs 24.1, but was not announced in
+its NEWS.)
-** The `save-place' variable is replaced by a `save-place-mode'.
+---
+*** Killing text now also sets the CLIPBOARD/PRIMARY selection
+in the surrounding GUI (using the OSC-52 escape sequence). This only works
+if your xterm supports it and enables the `allowWindowOps' options (disabled
+by default at least in Debian, for security reasons).
+
+Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
+escape sequence) if your xterm has the feature enabled but for that you
+additionally need to add `getSelection' to `xterm-extra-capabilities'.
+
++++
+*** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
+
+---
+** The `save-place' variable is replaced by `save-place-mode'.
** ERC
-*** 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.
++++
+*** ERC can now hide message types by network or channel.
+`erc-hide-list' will hide all messages of the specified type, while
+`erc-network-hide-list' and `erc-channel-hide-list' will only hide the
+specified message types for the respective specified targets.
*** New variable `erc-default-port-tls' used to connect to TLS IRC
servers.
** Midnight-mode
-*** `midnight-mode' is a proper minor mode.
-*** clean-buffer-*-regexps can now specify buffers via predicate functions.
-
-** In xterms, killing text now also sets the CLIPBOARD/PRIMARY selection
-in the surrounding GUI (using the OSC-52 escape sequence). This only works
-if your xterm supports it and enables the `allowWindowOps' options (disabled
-by default at least in Debian, for security reasons).
-Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
-escape sequence) if your xterm has the feature enabled but for that you
-additionally need to add `getSelection' to `xterm-extra-capabilities'.
+---
+*** `midnight-mode' is now a proper minor mode.
-** xterm-mouse-mode now supports mouse-tracking (if your xterm supports it).
+---
+*** clean-buffer-*-regexps can now specify buffers via predicate functions.
** package.el
++++
*** New "external" package status.
An external package is any installed package that's not built-in and
not from `package-user-dir', which usually means it's from an entry in
packages, in that they cannot be deleted through the package menu and
are not considered for upgrades.
-The effect, is that a user can manually place a specific version of a
+The effect is that a user can manually place a specific version of a
package inside `package-directory-list' and the package menu will
always respect that.
++++
*** 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'.
++++
*** `package-menu-toggle-hiding' now toggles the hiding of packages.
This includes the above-mentioned low-priority packages, as well as
available packages whose version is lower than the currently installed
This allows users to downgrade a package if a lower version is
available.
+---
*** When filtering the package menu, keywords starting with "arc:" or
"status:" represent package archive or status, respectively, instead
of actual keywords.
+---
*** Most functions which involve downloading information now take an
ASYNC argument. If it is non-nil, package.el performs the download(s)
asynchronously.
+---
*** New variable `package-menu-async' controls whether the
package-menu uses asynchronous downloads.
+---
*** `package-install-from-buffer' and `package-install-file' work on directories.
This follows the same rules as installing from a .tar file, except the
-pkg file is optional.
+---
*** Packages which are dependencies of other packages cannot be deleted.
The FORCE argument to `package-delete' overrides this.
+---
*** 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.
+---
*** New command `package-install-user-selected-packages' installs all
packages from `package-selected-packages' which are currently missing.
+---
*** New command `package-autoremove' removes all packages which were
installed strictly as dependencies but are no longer needed.
++++
** Shell
When you invoke `shell' interactively, the *shell* buffer will now
*** `constructor' is now an obsolete alias for `make-instance'.
** ido
+
++++
*** New command `ido-bury-buffer-at-head' bound to C-S-b
Bury the buffer at the head of `ido-matches', analogous to how C-k
kills the buffer at head.
+
+---
*** A prefix argument to `ido-restrict-to-matches' will reverse its
meaning, and the list is restricted to those elements that do not
match the current input.
** Minibuffer
-*** You can use <up> and <down> keys to move point in the multi-line
-minibuffer just as in an ordinary buffer. Only when point moves over
++++
+*** You can use <UP> and <DOWN> arrow keys to move through history by lines.
+The new commands `next-line-or-history-element' and
+`previous-line-or-history-element', bound to <UP> and <DOWN> in the
+minibuffer, allow by-line movement through minibuffer history,
+similarly to an ordinary buffer. Only when point moves over
the bottom/top of the minibuffer it goes to the next/previous history
-element. The new commands bound to <up> and <down> in the minibuffer:
-`next-line-or-history-element' and `previous-line-or-history-element'.
+element. `M-p' and `M-n' still move directly to previous/next history
+item as before.
** Search and Replace
++++
+*** New user option `search-default-regexp-mode'
+specifies the default mode for I-search.
+
++++
+*** `isearch' and `query-replace' can now perform character folding in matches.
+Isearch does that by default, while `query-replace' will do that if
+the new variable `replace-character-fold' is customized to a non-nil
+value. This is analogous to case folding, but instead of disregarding
+case variants, it disregards wider classes of distinctions between
+similar characters. (Case folding is a special case of character
+folding.) This means many characters in the search string will match
+entire groups of characters instead of just themselves.
+
+For instance, the " will match all variants of double quotes (like “
+and ”), and the letter a will match all of its accented cousins, even
+those composed of multiple characters, as well as many other symbols
+like ℀, ℁, ⒜, and ⓐ.
+
++++
+*** New function `character-fold-to-regexp' can be used
+by searching commands to produce a regexp matching anything that
+character-folds into STRING.
+
++++
+*** The new M-s M-w key binding uses eww to search the web for the
+text in the region. The search engine to use for this is specified by
+the customizable variable `eww-search-prefix'.
+
++++
*** Query-replace history is enhanced.
When query-replace reads the FROM string from the minibuffer, typing
`M-p' will now show previous replacements as "FROM SEP TO", where FROM
instrumented function.
** ElDoc
+
++++
*** New minor mode `global-eldoc-mode'
+It is turned on by default, and affects `*scratch*' and other buffers
+whose major mode supports Emacs Lisp.
+
+---
*** `eldoc-documentation-function' now defaults to `ignore'
+
+---
*** `describe-char-eldoc' displays information about character at point,
and can be used as a default value of `eldoc-documentation-function'. It is
useful when, for example, one needs to distinguish various spaces (e.g. ] [,
** Message mode
+---
*** text/html messages that contain inline image parts will be
transformed into multipart/related messages before sending.
-** pcase
-*** New UPatterns `quote', `app', `cl-struct', and `eieio'.
-*** New UPatterns can be defined with `pcase-defmacro'.
+++
-*** New vector QPattern.
+** In Show Paren Mode, a parenthesis can be highlighted when point
+stands inside it, and certain parens can be highlighted when point is
+at BOL or EOL, or in whitespace there. To enable these, customize,
+respectively, `show-paren-when-point-inside-paren' or
+`show-paren-when-point-in-periphery'.
** Lisp mode
+
+---
*** Strings after `:documentation' are highlighted as docstrings.
+This enhances Lisp mode fontification to handle documentation of the
+form `(:documentation "the doc string")' used in Common Lisp code for
+CLOS class and slot documentation.
** Rectangle editing
+
++++
*** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
+
++++
*** C-x C-x in rectangle-mark-mode now cycles through the four corners.
*** `string-rectangle' provides on-the-fly preview of the result.
-** New font-lock functions font-lock-ensure and font-lock-flush, which
-should be used instead of font-lock-fontify-buffer when called from Elisp.
++++
+** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
+These should be used in preference to `font-lock-fontify-buffer' when
+called from Lisp.
-** Macro `minibuffer-with-setup-hook' takes (:append FUN) to mean
-appending FUN to `minibuffer-setup-hook'.
+---
+** Macro `minibuffer-with-setup-hook' can optionally append a function
+to `minibuffer-setup-hook'.
+
+If the first argument of the macro is of the form `(:append FUN)',
+then FUN will be appended to `minibuffer-setup-hook', instead of
+prepending it.
** cl-lib
-*** New functions cl-fresh-line, cl-digit-char-p and cl-parse-integer.
++++
+*** New functions `cl-fresh-line', `cl-digit-char-p', and `cl-parse-integer'.
** Calendar and diary
**** The nil and list forms of `diary-display-function'.
++++
** New ERT function `ert-summarize-tests-batch-and-exit'.
+If the output of ERT tests in batch mode execution can be saved to a
+log file, then it can be passed as an argument to the above function
+to produce a neat summary.
+---
** New js.el option `js-indent-first-init'.
+It was renamed from `js-indent-first-initialiser', to avoid issues
+with American vs British spelling.
+
+** Info
---
-** `Info-fontify-maximum-menu-size' can be t for no limit.
+** Info mode now displays symbol names in fixed-pitch font.
+If you want to get the old behavior back, customize the `Info-quoted'
+face to use the same definitions as the default face.
+
+---
+*** `Info-fontify-maximum-menu-size' can be t for no limit.
+++
-** `info-display-manual' can now be given a prefix argument which (any
+*** `info-display-manual' can now be given a prefix argument which (any
non-nil value) directs the command to limit the completion
alternatives to currently visited manuals.
** Rmail
-*** The Rmail commands d, C-d and u take optional repeat counts to delete or
-undelete multiple messages.
++++
+*** The Rmail commands `d', `C-d' and `u' take optional repeat counts
+to delete or undelete multiple messages.
++++
*** Rmail can now render HTML mail messages if your Emacs was built with
libxml2 or if you have the Lynx browser installed. By default, Rmail
will display the HTML version of a mail message that has both HTML and
*** In the commands that make summaries by subject, recipients, or senders,
you can no longer use commas to separate regular expressions.
++++
** SES now supports local printer functions; see `ses-define-local-printer'.
-** sh-script
+** Shell-script Mode
+---
*** 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.
+---
+*** New value `always' for `sh-indent-after-continuation'.
This provides old-style ("dumb") indentation of continued lines.
+See the doc string of `sh-indent-after-continuation' for details.
** TLS
---
*** Fatal TLS errors are now silent by default.
+---
+*** If Emacs isn't built with TLS support, an external TLS-capable
+program is used instead. This program used to be run in --insecure
+mode by default, but has now changed to be secure instead, and will
+fail if you try to connect to non-verifiable hosts. This is
+controlled by the `tls-program' variable.
+
** URL
++++
*** The URL package accepts now the protocols "ssh", "scp" and "rsync".
When `url-handler-mode' is enabled, file operations for these
protocols as well as for "telnet" and "ftp" are passed to Tramp.
++++
*** The URL package allows customizing the `url-user-agent' string.
The new `url-user-agent' variable can be customized to be a string or
a function.
+---
*** The new interface variable `url-request-noninteractive' can be used
to specify that we're running in a noninteractive context, and that
we should not be queried about things like TLS certificate validity.
+---
*** If URL is used with a https connection, the first callback argument
plist will contain a :peer element that has the output of
`gnutls-peer-status' (if Emacs is built with GnuTLS support).
** SQL mode
+---
*** New user variable `sql-default-directory' enables remote
connections using Tramp.
-*** New command `sql-send-line-and-next' sends the current line to the
-interactive buffer and advances to the next line, skipping whitespace
-and comments.
+---
+*** New command `sql-send-line-and-next'.
+This command, bound to `C-c C-n' by default, sends the current line to
+the SQL process and advances to the next line, skipping whitespace and
+comments.
-*** Add support for Vertica SQL.
+---
+*** Added support for Vertica SQL.
** VC and related modes
++++
*** Basic push support, via `vc-push', bound to `C-x v P'.
Implemented for Bzr, Git, Hg. As part of this change, the pre-existing
(undocumented) command vc-hg-push now behaves slightly differently.
++++
*** The new command vc-region-history shows the log+diff of the active region.
++++
+*** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
+This command is useful when you perform version control commands
+outside Emacs (e.g., from the shell prompt), or if you switch the VC
+back-end for the buffer's file, or remove it from version control.
+
++++
*** New option `vc-annotate-background-mode' controls whether
the color range from `vc-annotate-color-map' is applied to the
background or to the foreground.
-*** `compare-windows' now compares text with the most recently used window
-instead of the next window. The new option `compare-windows-get-window-function'
-allows to customize this.
++++
+*** `compare-windows' now compares text with the most recently selected window
+instead of the next window. If you want the previous behavior of
+comparing with the next window, customize the new option
+`compare-windows-get-window-function' to the value
+`compare-windows-get-next-window'.
+---
*** Two new faces `compare-windows-removed' and `compare-windows-added'
-replace the obsolete face `compare-windows'.
+replace the face `compare-windows', which is now an obsolete alias for
+`compare-windows-added'.
---
*** `log-edit-insert-changelog' converts "(tiny change)" to
"Copyright-paperwork-exempt: yes". Set `log-edit-rewrite-tiny-change'
nil to disable this.
-** VHDL mode supports VHDL'08.
+---
+** VHDL mode now supports VHDL'08.
+
+** Calculator
+
+---
+*** Decimal display mode uses "," groups, so it's more
+fitting for use in money calculations
+
+---
+*** Factorial works with non-integer inputs.
+
+** Hide-IfDef mode
+
+---
+*** Hide-IfDef mode now support full C/C++ expressions in macros,
+macro argument expansion, interactive macro evaluation and automatic
+scanning of #define'd symbols.
+
+---
+*** New command `hif-evaluate-macro', bound to `C-c @ e', displays the
+result of evaluating a macro.
-** Calculator: decimal display mode uses "," groups, so it's more
-fitting for use in money calculations; factorial works with
-non-integer inputs.
+---
+*** New command `hif-clear-all-ifdef-define', bound to `C-c @ C', clears
+all defined symbols in `hide-ifdef-env'.
-** HideIfDef mode now support full C/C++ expressions, argumented macro expansions,
-interactive macro evaluation and automatic scanning of #defined symbols.
+---
+*** New custom variable `hide-ifdef-header-regexp' to define C/C++ header
+file name patterns. Defaults to files whose extension is one of `.h',
+`.hh', `.hpp', `.hxx', or `.h++', matched case-insensitively.
-*** New custom variable `hide-ifdef-header-regexp' to define C/C++ header file
-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.
+reinclusion protected (a.k.a. "idempotent") header files from being hidden.
+(This could happen when an idempotent header file is visited again,
+when its guard symbol is already defined.) Defaults to `t'.
+
+---
*** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
-name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be excluded.
+name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
+looking for macro definitions. By default, no symbols are ignored.
** TeX mode
++++
*** New custom variable `tex-print-file-extension' to help users who
use PDF instead of DVI.
++++
*** TeX mode now supports Prettify Symbols mode. When enabling
`prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
many other math macros are displayed using unicode characters.
-** whitespace-mode: new 'big-indent style highlighting too much indentation.
-By default, 32 spaces and four TABs are considered to be too much but
-`whitespace-big-indent-regexp' can be configured to change that.
++++
+** New `big-indent' style in `whitespace-mode' highlights deep indentation.
+By default, 32 consecutive spaces or four consecutive TABs are
+considered to be too deep, but the new variable
+`whitespace-big-indent-regexp' can be customized to change that.
-** tildify: `tildify-space-string', `tildify-pattern', and
-`tildify-foreach-region-function' variables added making
+---
+** New options in `tildify-mode'.
+New options `tildify-space-string', `tildify-pattern', and
+`tildify-foreach-region-function' variables make
`tildify-string-alist', `tildify-pattern-alist', and
`tildify-ignored-environments-alist' variables (as well as a few
helper functions) obsolete.
-** xref
-The new package provides generic framework and new commands to find
-and move to definitions, as well as pop back to the original location.
++++
+** New package Xref replaces Etags's front-end and UI
+
+The new package Xref provides a generic framework and new commands to
+find and move to definitions of functions, macros, data structures
+etc., as well as go back to the location where you were before moving
+to a definition. It supersedes and obsoletes many Etags commands,
+while still using the etags.el code that reads the TAGS tables as one
+of its back-ends.
+
+The command `xref-find-definitions' replaces `find-tag' and provides
+an interface to pick one definition among several.
+`tags-loop-continue' is now unbound. `xref-pop-marker-stack' replaces
+`pop-tag-mark', but has a keybinding (`M-,') different from the one
+`pop-tag-mark' used.
-*** New key bindings
-`xref-find-definitions' replaces `find-tag' and provides an interface
-to pick one destination among several. Hence, `tags-loop-continue' is
-unbound. `xref-pop-marker-stack' replaces `pop-tag-mark', but uses an
-easier binding, which is now unoccupied (`M-,').
`xref-find-definitions-other-window' replaces `find-tag-other-window'.
`xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
`xref-find-apropos' replaces `find-tag-regexp'.
+As a result of this, the following commands are now obsolete:
+`find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
+`tags-apropos'.
+
+`tags-loop-continue' is not obsolete because it's still useful in
+`tags-search' and `tags-query-replace', for which there are no direct
+replacements yet.
+
++++
*** New variables
+
`find-tag-marker-ring-length' is now an obsolete alias for
`xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
alias for a private variable. `xref-push-marker-stack' and
-`xref-pop-marker-stack' should be used to mutate it instead.
+`xref-pop-marker-stack' should be used instead to manipulate the stack
+of searches for definitions.
-** etags
-As a result of the above, these commands are now obsolete:
-`find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
-`tags-apropos' and `tags-loop-continue'.
+---
+*** `xref-find-definitions' and `describe-function' now display
+information about mode local overrides (defined by cedet/mode-local.el
+`define-overloadable-function' `define-mode-local-overrides').
+
+The framework's Lisp API is still experimental and can change in major,
+backward-incompatible ways.
+
+---
+** New package Project
+
+The new package Project provides generic infrastructure for dealing
+with projects. The main commands included in it are
+`project-find-file' and `project-find-regexp'.
+
+The Lisp API of this package is still experimental.
** EUDC
EUDC's LDAP backend has been improved.
++++
*** EUDC supports LDAP-over-SSL URLs (ldaps://).
+---
*** EUDC passes LDAP passwords through a pipe to the ldapsearch
subprocess instead of on the command line.
+---
*** EUDC handles LDAP wildcards automatically so the user shouldn't
need to configure this manually anymore.
++++
*** The LDAP configuration section of EUDC's manual has been
rewritten.
There have also been customization changes.
++++
*** New custom variable `eudc-server-hotlist' to allow specifying
multiple EUDC servers in init file.
++++
*** Custom variable `eudc-inline-query-format' defaults to completing
on email and firstname instead of surname.
+---
*** Custom variable `eudc-expansion-overwrites-query' defaults to nil
to avoid interfering with the kill ring.
++++
*** Custom variable `eudc-inline-expansion-format' defaults to
"Firstname Surname <mail-address>".
++++
*** Custom variable `eudc-options-file' defaults to
"~/.emacs.d/eudc-options".
+---
*** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
allow overriding the regular expression that recognizes the ldapsearch
command line's password prompt.
+---
+EUDC's BBDB backend now supports BBDB 3.
+
+---
+EUDC's PH backend (eudcb-ph.el) is obsolete.
+
** Eshell
+++
*** The new built-in command `clear' can scroll window contents out of sight.
If provided with an optional non-nil argument, the scrollback contents will be cleared.
++++
*** New buffer syntax '#<buffer-name>', which is equivalent to
'#<buffer buffer-name>'. This shorthand makes interacting with
buffers from eshell more convenient. Custom variable
`eshell-buffer-shorthand', which has been broken for a while, has been
removed.
++++
*** By default, eshell "visual" program buffers (created by
`eshell-visual-commands' and similar custom vars) are no longer killed
when their processes die. This fixes issues with short-lived commands
** Browse-url
+---
*** Support for the Conkeror web browser.
---
*** `W' is now bound to `browse-url-of-dired-file', and is useful for
viewing HTML files and the like.
+** Tabulated List Mode
+
++++
+*** It is now safe for a mode that derives `tabulated-list-mode' to not
+call `tabulated-list-init-header', in which case it will have no
+header.
+
++++
+*** `tabulated-list-print' takes a second optional argument, update,
+which specifies an alternative printing method which is faster when
+few or no entries have changed.
+
** Obsolete packages
---
*** gulp.el
+---
*** landmark.el (moved to elpa.gnu.org)
\f
* New Modes and Packages in Emacs 25.1
+---
** pinentry.el allows GnuPG passphrase to be prompted through the
minibuffer instead of a graphical dialog, depending on whether the gpg
command is called from Emacs (i.e., INSIDE_EMACS environment variable
** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
+---
** scss-mode (a minor variant of css-mode)
+---
** let-alist is a new macro (and a package) that allows one to easily
let-bind the values stored in an alist.
+---
** `tildify-mode' allows to automatically insert hard spaces as one
types the text. Breaking line after a single-character words is
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
+---
+** `setq' and `setf' must now be called with an even number of
+arguments. The earlier behavior of silently supplying a nil to the
+last variable when there was an odd number of arguments has been
+eliminated.
+
++++
** `syntax-begin-function' is declared obsolete.
Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
slot in font-lock-defaults.
`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.
-** `inhibit-point-motion-hooks' now defaults to t and is obsolete.
-
+++
** `track-mouse' no longer freezes the shape of the mouse pointer.
The `track-mouse' form no longer refrains from changing the shape of
pointer shape during dragging, should bind the variable `track-mouse'
to the special value `dragging' in the body of the form.
+---
** The optional `predicate' argument of `lisp-complete-symbol' no longer
has any effect. (This change was made in Emacs 24.4 but was not
advertised at the time.)
++++
** `indirect-function' does not signal `void-function' any more.
This is mostly a bug-fix, since this change was missed back in 24.4 when
symbol-function was changed not to signal `void-function' any more.
+
++++
*** As a consequence, the second arg of `indirect-function' is now obsolete.
++++
** Comint, term, and compile do not set the EMACS env var any more.
Use the INSIDE_EMACS environment variable instead.
++++
** `save-excursion' does not save&restore the mark any more.
+Use `save-mark-and-excursion' if you want the old behavior.
-** read-buffer-function can now be called with a 4th argument (`predicate').
++++
+** `read-buffer' and `read-buffer-function' can now be called with a 4th
+argument (`predicate').
-** completion-table-dynamic stays in the minibuffer.
++++
+** `completion-table-dynamic' by default stays in the minibuffer.
+The minibuffer will be the current buffer when the function is called.
If you want the old behavior of calling the function in the buffer
-from which the minibuffer was entered, call it with the new argument
-`switch-buffer'.
+from which the minibuffer was entered, use the new argument
+`switch-buffer' to `completion-table-dynamic'.
+---
** window-configurations no longer record the buffers' marks.
+---
** inhibit-modification-hooks now also inhibits lock-file checks, as well as
active region handling.
++++
** deactivate-mark is now buffer-local.
++++
** `cl-the' now asserts that its argument is of the given type.
-** `process-running-child-p` may now return a numeric process
++++
+** `process-running-child-p' may now return a numeric process
group ID instead of `t'.
+++
any reference to a buffer position. The 6th member of the mouse
position list returned for such events is now nil.
+---
** Menu items in keymaps do not support the "key shortcut cache" any more.
These slots used to hold key-shortcut data, but have been obsolete since
Emacs-21.
+---
** Emacs no longer downcases the first letter of a system diagnostic
when signaling a file error. For example, it now reports "Permission
denied" instead of "permission denied". The old behavior was problematic
** 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. Any third-party code that changes these templates should
\f
* Lisp Changes in Emacs 25.1
+** pcase
+*** New UPatterns `quote', `app', `cl-struct', `eieio', `seq', and `map'.
+*** New UPatterns can be defined with `pcase-defmacro'.
++++
+*** New vector QPattern.
+
+---
** 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 hooks `prefix-command-echo-keystrokes-functions' and
+`prefix-command-preserve-state-hook' allow the definition of prefix
+commands other than the predefined `C-u'.
++++
** New functions `filepos-to-bufferpos' and `bufferpos-to-filepos'.
+These allow to convert between buffer positions and the corresponding
+file byte offsets, given the file's encoding.
++++
** The default value of `load-read-function' is now `read'.
+Previously, the default value of `nil' implied using `read'.
-** New hook `pre-redisplay-functions', a bit easier to use than pre-redisplay-function.
++++
+** New hook `pre-redisplay-functions'.
+It is a bit easier to use than `pre-redisplay-function'.
++++
** The second arg of `looking-back' should always be provided explicitly.
+Previously, it was an optional argument, now it's mandatory.
-** Obsolete text properties `intangible', `point-entered', and `point-left'.
++++
+** Text properties `intangible', `point-entered', and `point-left' are obsolete.
Replaced by properties `cursor-intangible' and `cursor-sensor-functions',
implemented by the new `cursor-intangible-mode' and
`cursor-sensor-mode' minor modes.
++++
+** `inhibit-point-motion-hooks' now defaults to `t' and is obsolete.
+Use the new minor modes `cursor-intangible-mode' and
+`cursor-sensor-mode' instead.
+
++++
** New process type `pipe', which can be used in combination with the
`:stderr' keyword of make-process to handle standard error output
of subprocess.
++++
** New function `make-process' provides an alternative interface to
`start-process'. It allows programs to set process parameters such as
process filter, sentinel, etc., through keyword arguments (similar to
`make-network-process').
-** `read-buffer' takes a new `predicate' argument.
++++
+** A new function `directory-files-recursively' returns all matching
+files (recursively) under a directory.
+
++++
+** New variable `inhibit-message', when bound to non-nil, inhibits
+`message' and related functions from displaying messages in the echo
+area. The output is still logged to the *Messages* buffer.
+
++++
+** A new text property `inhibit-read-only' can be used in read-only
+buffers to allow certain parts of the text to be writable.
+
++++
+** A new variable `comment-end-can-be-escaped' is useful in languages
+ such as C and C++ where line comments with escaped newlines are
+ continued to the next line.
+
++++
+** New macro `define-advice'.
++++
** Emacs Lisp now supports generators.
+See the "Generators" section of the ELisp manual for the details.
-** New finalizer facility for running code when objects
- become unreachable.
++++
+** New finalizer facility for running code when objects become unreachable.
+See the "Finalizer Type" subsection in the ELisp manual for the
+details.
-** lexical closures can use (:documentation <form>) to build their docstring.
-It should be placed right where the docstring would be, and <form> is then
+---
+** lexical closures can use (:documentation FORM) to build their docstring.
+It should be placed right where the docstring would be, and FORM is then
evaluated (and should return a string) when the closure is built.
++++
** define-inline provides a new way to define inlinable functions.
-** New function `macroexpand-1' to perform a single step of macroexpansion.
++++
+** New function `macroexpand-1' to perform a single step of macro expansion.
-** Some "x-*" were obsoleted:
++++
+** Some "x-*" functions were obsoleted and/or renamed:
*** x-select-text is renamed gui-select-text.
*** x-selection-value is renamed gui-selection-value.
*** x-get-selection is renamed gui-get-selection.
*** x-get-selection-value is renamed to gui-get-primary-selection.
*** x-set-selection is renamed to gui-set-selection
++++
** New function `string-greaterp', which return the opposite result of
`string-lessp'.
++++
+** The new functions `string-collate-lessp' and `string-collate-equalp'
+preserve the collation order as defined by the system's locale(1)
+environment. For the time being this is implemented for modern POSIX
+systems and for MS-Windows, for other systems they fall back to their
+counterparts `string-lessp' and `string-equal'.
+
+---
+*** The ls-lisp package uses `string-collate-lessp' to sort file names.
+If you want the old, locale-independent sorting, customize the new
+option `ls-lisp-use-string-collate' to a nil value.
+
++++
+*** The MS-Windows specific variable `w32-collate-ignore-punctuation',
+if set to a non-nil value, causes the above 2 functions to ignore
+symbol and punctuation characters when collating strings. This
+emulates the behavior of modern Posix platforms when the locale's
+codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
+MS-Windows doesn't support UTF-8 as codeset in its locales.
+
++++
** New function `alist-get', which is also a valid place (aka lvalue).
++++
** New function `funcall-interactively', which works like `funcall'
but makes `called-interactively-p' treat the function as (you guessed it)
called interactively.
++++
** New function `function-put' to use instead of `put' for function properties.
++++
+** The new function `bidi-find-overridden-directionality' allows to
+find characters whose directionality was, perhaps maliciously,
+overridden by directional override control characters. Lisp programs
+can use this to detect potential phishing of URLs and other links that
+exploits bidirectional display reordering.
+
++++
+** The new function `buffer-substring-with-bidi-context' allows to
+copy a portion of a buffer into a different location while preserving
+the visual appearance both of the copied text and the text at
+destination, even when the copied text includes mixed bidirectional
+text and directional control characters.
+
+++
** New properties that can be specified with `declare':
*** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
** New macro `with-file-modes', for evaluating expressions with default file
permissions set to temporary values (e.g., for creating private files).
++++
** You can access the slots of structures using `cl-struct-slot-value'.
++++
** Function `sort' can deal with vectors.
** Function `system-name' now returns an updated value if the current
+++
** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
+---
** If `pwd' is called with a prefix argument, insert the current default
directory at point.
++++
+** New functions return extended information about fonts and faces.
+
++++
+*** The function `font-info' now returns more details about a font.
+In particular, it now returns the average width of the font's
+characters, which can be used for geometry-related calculations.
+
++++
+*** A new function `default-font-width' returns the average width of a
+character in the current buffer's default font. If the default face
+is remapped (see `face-remapping-alist'), the value for the remapped
+face is returned. This function complements the existing function
+`default-font-height'.
+
++++
+*** New functions `window-font-height' and `window-font-width' return
+the height and average width of characters in a specified face and
+window. If FACE is remapped (see `face-remapping-alist'), the
+function returns the information for the remapped face.
+
++++
+*** A new function `window-max-chars-per-line' returns the maximal
+number of characters that can be displayed on one line. If a face
+and/or window are provided, these values are used for the
+calculation. This function is different from `window-body-width' in
+that it accounts for (i) continuation glyphs, (ii) the size of the
+font, and (iii) the specified window.
+
---
** New utilities in subr-x.el:
*** New macros `if-let' and `when-let' allow defining bindings and to
** New function `set-binary-mode' allows to switch a standard stream
of the Emacs process to binary I/O mode.
++++
+** The new function `directory-name-p' can be used to check whether a file
+name (as returned from, for instance, `file-name-all-completions') is
+a directory file name. It returns non-nil if the last character in
+the name is a directory separator character (forward slash on GNU and
+Unix systems, forward- or backslash on MS-Windows and MS-DOS).
+
+---
** 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.
+To force a specific encoding, bind `coding-system-for-write' to the
+coding-system of your choice when invoking functions like `prin1' and
+`message'.
+
++++
+** New var `truncate-string-ellipsis' to choose how to indicate truncation.
+
++++
+** New possible value for `system-type': `nacl'.
+This is used by Google's Native Client (NaCl).
** Miscellaneous name change
+---
For consistency with the usual Emacs spelling, the Lisp variable
`hfy-optimisations' has been renamed to `hfy-optimizations'.
The old name should still work, as an obsolescent alias.
-\f
-* Changes in Frames and Windows Code in Emacs 25.1
+** Changes in Frame- and Window- Handling
+++
-** Emacs can now draw horizontal scroll bars on some platforms that
+*** Emacs can now draw horizontal scroll bars on some platforms that
provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
Horizontal scroll bars are turned off by default.
-*** New function `horizontal-scroll-bars-available-p' telling whether
+
+**** New function `horizontal-scroll-bars-available-p' telling whether
horizontal scroll bars are available on the underlying system.
-*** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
+
+**** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
bars on all existing and future frames.
-*** New function `toggle-horizontal-scroll-bar' to toggle horizontal
+
+**** New function `toggle-horizontal-scroll-bar' to toggle horizontal
scroll bars on the selected frame.
-*** New frame parameters `horizontal-scroll-bars' and
+
+**** New frame parameters `horizontal-scroll-bars' and
`scroll-bar-height' to set horizontal scroll bars and their height
for individual frames and in `default-frame-alist'.
-*** New functions `frame-scroll-bar-height' and
+
+**** New functions `frame-scroll-bar-height' and
`window-scroll-bar-height' return the height of horizontal scroll
bars on a specific frame or window.
-*** `set-window-scroll-bars' now accepts five parameters where the last
+
+**** `set-window-scroll-bars' now accepts five parameters where the last
two specify height and type of the window's horizontal scroll bar.
-*** `window-scroll-bars' now returns type and sizes of horizontal scroll
+
+**** `window-scroll-bars' now returns type and sizes of horizontal scroll
bars too.
-*** New buffer-local variables `horizontal-scroll-bar' and
+
+**** New buffer-local variables `horizontal-scroll-bar' and
`scroll-bar-height'.
+++
-** New functions `frame-geometry' and `frame-edges' give access to a
+*** New functions `frame-geometry' and `frame-edges' give access to a
frame's geometry.
+++
-** New functions `mouse-absolute-pixel-position' and
+*** New functions `mouse-absolute-pixel-position' and
`set-mouse-absolute-pixel-position' get/set screen coordinates of the
mouse cursor.
+++
-** The function `window-edges' now accepts three additional arguments to
+*** The function `window-edges' now accepts three additional arguments to
retrieve body, absolute and pixel edges of the window.
+++
-** The functions `window-inside-edges', `window-inside-pixel-edges' and
+*** The functions `window-inside-edges', `window-inside-pixel-edges' and
`window-inside-absolute-pixel-edges' have been renamed to respectively
`window-body-edges', `window-body-pixel-edges' and
`window-absolute-body-pixel-edges'. The old names are kept as aliases.
+++
-** New function `window-absolute-pixel-position' to get the screen
+*** New function `window-absolute-pixel-position' to get the screen
coordinates of a visible buffer position.
+++
-** The height of a frame's menu and tool bar are no longer counted in the
+*** The height of a frame's menu and tool bar are no longer counted in the
frame's text height. This means that the text height stands only for
the height of the frame's root window plus that of the echo area (if
present). This was already the behavior for frames with external tool
builds.
+++
-** Frames now do not necessarily preserve the number of columns or lines
+*** Frames now do not necessarily preserve the number of columns or lines
they display when setting default font, menu bar, fringe width, or
scroll bars. In particular, maximized and fullscreen frames are
conceptually never resized if such settings change. For fullheight and
fullwidth frames, the behavior may depend on the toolkit used.
-*** New option `frame-inhibit-implied-resize' if non-nil, means that
+**** New option `frame-inhibit-implied-resize' if non-nil, means that
setting default font, menu bar, fringe width, or scroll bars of a
specific frame does not resize that frame in order to preserve the
number of columns or lines it displays.
+++
-** New function `window-preserve-size' allows to preserve the size of
+*** New function `window-preserve-size' allows to preserve the size of
windows without "fixing" it. It's supported by `fit-window-to-buffer',
`temp-buffer-resize-mode' and `display-buffer'.
+++
-** New minor mode `window-divider-mode' and options
-`window-divider-default-places', `window-divider-default-bottom-width'
-and `window-divider-default-right-width'.
-
-+++
-** New option `switch-to-buffer-in-dedicated-window' allows to customize
-how `switch-to-buffer' proceeds interactively when the selected window
-is strongly dedicated to its buffer.
+*** 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.
+++
-** The option `even-window-heights' has been renamed to
-`even-window-sizes' and now handles window widths as well.
+*** New minor mode `window-divider-mode' and options
+`window-divider-default-places', `window-divider-default-bottom-width'
+and `window-divider-default-right-width'.
-** Tearoff menus and detachable toolbars for Gtk+ has been removed.
+---
+** Tearoff menus and detachable toolbars for Gtk+ have been removed.
Those features have been deprecated in Gtk+ for a long time.
-** Miscellaneous
+** Etags
++++
*** etags no longer qualifies class members by default.
+
By default, `etags' will not qualify class members for C-like
object-oriented languages with their class names and namespaces, and
will remove qualifications used explicitly in the code from the tag
(`xref-find-definitions'); if so, you can use `C-u M-.' to specify the
qualified names by hand.
++++
+*** New language Ruby
+
+Names of modules, classes, methods, and functions are tagged.
+Overloaded operators are also tagged.
+
++++
+*** Improved support for Lua
+
+Etags now tags functions even if the "function" keyword follows some
+whitespace at line beginning.
+
\f
* Changes in Emacs 25.1 on Non-Free Operating Systems
+++
** Emacs running on MS-Windows now supports the daemon mode.
+---
** The byte counts in etags-generated TAGS files are now the same on
MS-Windows as they are on other platforms.
** On OS X, configure creates a Cocoa ("Nextstep") build by default.
Pass '--without-ns' to configure to create an X11 build, the old default.
+---
** OS X 10.5 or older is no longer supported.
+---
** OS X on PowerPC is no longer supported.
+---
+** New variable `ns-use-fullscreen-animation' controls animation for
+non-native NS fullscreen. The default is nil. Set to t to enable
+animation when entering and leaving fullscreen. For native OSX fullscreen
+this has no effect.
+
---
** The new function 'w32-application-type' returns the type of an
MS-Windows application given the name of its executable program file.
+** New variable `w32-pipe-buffer-size'.
+It can be used to tune the size of the buffer of pipes created for
+communicating with subprocesses, when the program run by a subprocess
+exhibits unusual buffering behavior. Default is zero, which lets the
+OS use its default size.
+
\f
----------------------------------------------------------------------
This file is part of GNU Emacs.