Commit 91b65361 authored by Chong Yidong's avatar Chong Yidong
Browse files

* doc/lispref/anti.texi (Antinews): Rewrite for Emacs 23.

* etc/NEWS: Some minor rearrangement.
parent ca2c89b6
2012-04-05 Chong Yidong <cyd@gnu.org>
* anti.texi (Antinews): Rewrite for Emacs 23.
* minibuf.texi (Programmed Completion): Document metadata method.
2012-04-04 Chong Yidong <cyd@gnu.org>
* minibuf.texi (Programmed Completion): Remove obsolete variable
......
......@@ -11,145 +11,129 @@
@c with the above version number.
For those users who live backwards in time, here is information about
downgrading to Emacs version 22.3. We hope you will enjoy the greater
downgrading to Emacs version 23.4. We hope you will enjoy the greater
simplicity that results from the absence of many Emacs @value{EMACSVER}
features.
@section Old Lisp Features in Emacs 22
@section Old Lisp Features in Emacs 23
@itemize @bullet
@item
The internal character representation used by Emacs is not longer
based on Unicode. In this representation, called @code{emacs-mule},
each character belongs to one and only one script. Emacs makes no
attempt to distinguish between ``similar'' characters occurring in
different scripts.
Support for lexical scoping has been removed; all variables are
dynamically scoped. The @code{lexical-binding} variable has been
removed, and so has the @var{lexical} argument to @code{eval}. The
@code{defvar} and @code{defconst} forms no longer mark variables as
dynamic, since all variables are dynamic.
@item
The @code{^} interactive spec code, the function
@code{handle-shift-selection}, and the variable
@code{this-command-keys-shift-translated} have all been removed.
Shift-translated keys are no longer treated specially, making Emacs's
handling of keybindings much more consistent.
@item
Temporarily-active regions are not created by giving the variable
@code{transient-mark-mode} values of the form @code{(only
. @var{oldvar})}. We instead use a more complicated scheme:
setting @code{transient-mark-mode} to @code{only} enables Transient
Mark mode for the following command only, during which the value of
@code{transient-mark-mode} is set to @code{identity}; if it is still
@code{identity} at the end of the command, Transient Mark mode is
disabled.
@item
Many minibuffer functions, such as @code{read-file-name} and
@code{minibuffer-complete}, have been rewritten in C for greater
speed. The completion code has been considerably simplified; the
completion style can no longer be changed via
@code{completion-styles-alist}, and @code{completing-read} no longer
recognizes the special values @code{confirm-only} and
@code{confirm-after-completion} for its @var{require-match} argument.
@item
Emacs no longer supports explicitly-numbered groups in regular
expressions.
Having only dynamic binding follows the spirit of Emacs extensibility,
for it allows any Emacs code to access any defined variable with a
minimum of fuss. But @xref{Dynamic Binding Tips}, for tips to avoid
making your programs hard to understand.
@item
The @code{permanent-local-hook} function property has no special
meaning.
Calling a minor mode function from Lisp with a nil or omitted argument
does not enable the minor mode unconditionally; instead, it toggles
the minor mode---which is the straightforward thing to do, since that
is the behavior when invoked interactively. One downside is that it
is more troublesome to enable minor modes from hooks; you have to do
something like
@item
The @code{functionp} function now returns @code{t} for special forms.
@example
(add-hook 'foo-hook (lambda () (bar-mode 1)))
@end example
@item
The @code{interactive-form} symbol property has no special meaning.
Once you supply a function with an interactive form, the only way to
change it is to redefine the function.
@noindent
or define @code{turn-on-bar-mode} and call that from the hook.
@item
The @code{ignore-errors} macro has been moved into the @code{cl}
package.
The @code{prog-mode} dummy major mode has been removed. Instead of
using it as a crutch to meet programming mode conventions, you should
explicitly ensure that your mode follows those conventions.
@xref{Major Mode Conventions}.
@item
Variables can now be both buffer-local and frame-local; buffer-local
bindings take precedence over frame-local bindings.
Emacs no longer supports bidirectional display and editing. Since
there is no need to worry about the insertion of right-to-left text
messing up how lines and paragraphs are displayed, the function
@code{bidi-string-mark-left-to-right} has been removed; so have many
other functions and variables related to bidirectional display.
Unicode directionality characters like @code{U+200E} ("left-to-right
mark") have no special effect on display.
@item
Faces can no longer be remapped.
Emacs windows now have most of their internal state hidden from Lisp.
Internal windows are no longer visible to Lisp; functions such as
@code{window-parent}, window parameters related to window arrangement,
and window-local buffer lists have all been removed. Functions for
resizing windows can delete windows if when they become too small.
@item
Lisp programs now specify fonts by their names, which are strings
following the XLFD (X logical font descriptor) format. Fonts are no
longer represented using a special set of ``font'' data types. The
various functions that act on these data types, such as @code{fontp},
@code{font-spec}, and @code{list-fonts}, have all been deleted.
The @dfn{action function} feature for controlling buffer display has
been removed, including @code{display-buffer-overriding-action} and
related variables, as well as the @var{action} argument to
@code{display-buffer} and other functions. The way to
programmatically control how Emacs chooses a window to display a
buffer is to bind the right combination of
@code{special-display-regexps}, @code{pop-up-frames}, and other
variables.
@item
Emacs does not recognize the @code{FontBackend} X resource and the
@code{font-backend} frame parameter. On the X Window System, fonts
are always drawn using the X core font driver.
The standard completion interface has been simplified, eliminating the
@code{completion-extra-properties} variable, the @code{metadata}
action flag for completion functions, and the concept of
@dfn{completion categories}. Lisp programmers may now find the choice
of methods for tuning completion less bewildering, but if a package
finds the streamlined interface insufficient for its needs, it must
implement its own specialized completion feature.
@item
Display terminals are no longer represented using a ``terminal'' data
type; this is not necessary, because we have removed the ability to
display on graphical and text terminals simultaneously. For the same
reason, the @code{window-system} variable is no longer frame-local,
and the @code{window-system} function has been removed.
@code{copy-directory} now behaves the same whether or not the
destination is an existing directory: if the destination exists, the
@emph{contents} of the first directory are copied into it (with
subdirectories handled recursively), rather than copying the first
directory into a subdirectory.
@item
The functions @code{list-system-processes} and
@code{process-attributes} have been removed. To get information about
system processes, call an external program, such as @command{ps}.
The @var{trash} arguments for @code{delete-file} and
@code{delete-directory} have been removed. The variable
@code{delete-by-moving-to-trash} must now be used with care; whenever
it is non-@code{nil}, all calls to @code{delete-file} or
@code{delete-directory} use the trash.
@item
The function @code{locate-user-emacs-file} and the variable
@code{user-emacs-directory} have been removed. Instead, use
hard-coded values pointing to @file{~/.emacs.d}.
Because Emacs no longer supports SELinux file contexts, the
@var{preserve-selinux-context} argument to @code{copy-file} has been
removed. The return value of @code{backup-buffer} no longer has an
entry for the SELinux file context.
@item
@code{vertical-motion} can no longer be told to move to a specific
column; it always puts point on the first column of a line.
For mouse click input events in the text area, the Y pixel coordinate
in the @var{position} list (@pxref{Click Events}) now counts from the
top of the header line, if there is one, rather than the top of the
text area.
@item
Windows no longer have parameters.
Bindings in menu keymaps (@pxref{Format of Keymaps}) now sometimes get
an additional @var{cache} entry in their definitions, like this:
@item
The @code{display-buffer} function has been rewritten in C. Its
window-splitting heuristics are a little less sophisticated, and a
little less documented. Window-splitting is handled internally,
instead of using @code{split-window-preferred-function} (which has
been removed). Windows are never split horizontally; the variable
@code{split-width-threshold} has been removed.
@example
(@var{type} @var{item-name} @var{cache} . @var{binding})
@end example
@item
The @code{mode-name} variable now accepts only string values, and
cannot take the form of a mode-line construct.
@item
The behavior of @code{map-char-table} has changed. It calls the
mapping function for every single character in the table, instead of
using cons cells to represent contiguous character code ranges.
@noindent
The @var{cache} entry is used internally by Emacs to record equivalent
keyboard key sequences for invoking the same command; Lisp programs
should never use it.
@item
Several keymaps have been eliminated: @code{input-decode-map},
@code{local-function-key-map}, @code{search-map},
@code{multi-query-replace-map}, and
@code{minibuffer-local-shell-command-map}.
The @code{open-network-stream} function has been removed, and so has
the @code{gnutls} library. Lisp programs that want an encrypted
network connection must now call external utilities such as
@command{starttls} or @command{gnutls-cli}.
@item
Many functions have been removed, including: @code{buffer-swap-text},
@code{emacs-init-time}, @code{emacs-uptime}, @code{use-region-p},
@code{region-active-p}, @code{start-file-process},
@code{process-lines}, @code{image-refresh},
@code{match-substitute-replacement}, @code{word-search-forward-lax},
and @code{word-search-backward-lax}.
Tool bars can no longer display separators, which frees up several
pixels of space on each graphical frame.
@item
Many variables have been removed, including @code{read-circle},
@code{after-init-time} and @code{before-init-time},
@code{generate-autoload-cookie}, @code{file-local-variables-alist},
@code{replace-search-function} and @code{replace-re-search-function},
@code{inhibit-changing-match-data}, @code{wrap-prefix}, and
@code{line-prefix},
Many other functions and variables have been eliminated.
@end itemize
......@@ -82,8 +82,6 @@ Nextstep builds).
** Completion
*** Shell mode uses pcomplete rules, with the standard completion UI.
*** Many packages now use the `completion-at-point' command,
rather than implementing separate completion commands.
......@@ -313,6 +311,9 @@ corresponding way.
** Window changes
*** The `quit-window' command now restores the last buffer displayed
in the quitted window.
*** Resizing an Emacs frame now preserves proportional window sizes,
modulo restrictions like window minimum sizes and fixed-size windows.
......@@ -339,6 +340,10 @@ otherwise cannot be split because it's too small by stealing space from
other windows in the same combination. Subsequent resizing or deletion
of the window will resize all windows in the same combination as well.
*** New option `frame-auto-hide-function' lets you choose between
iconifying or deleting a frame when burying a buffer in a dedicated
frame, or quitting a window showing a buffer in a frame of its own.
*** New commands `maximize-window' and `minimize-window'.
These maximize and minimize the size of a window within its frame.
......@@ -1149,14 +1154,6 @@ are user-customizable variables.
See the docstring of `display-buffer' for details.
*** New behavior of `quit-window'.
The behavior of `quit-window' has been changed in order to restore the
state before the last buffer display operation in that window.
*** The new option `frame-auto-hide-function' lets you choose between
iconifying or deleting a frame when burying a buffer shown in a dedicated
frame or quitting a window showing a buffer in a frame of its own.
*** New functions `window-state-get' and `window-state-put'.
These functions allow to save and restore the state of an arbitrary
frame or window as an Elisp object.
......
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