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(The Mark): Document use-region-p.

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Eli Zaretskii 2008-10-16 20:06:38 +00:00
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3 changed files with 28 additions and 3 deletions
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4
doc/lispref/ChangeLog
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@ -1,3 +1,7 @@
2008-10-16 Eli Zaretskii <eliz@gnu.org>
* markers.texi (The Mark): Document use-region-p.
2008-10-15 Eli Zaretskii <eliz@gnu.org>
* internals.texi (Writing Emacs Primitives): The interactive spec

26
doc/lispref/markers.texi
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@ -423,7 +423,11 @@ to the editor command loop by setting @code{deactivate-mark} to a
non-@code{nil} value (but this causes deactivation only if Transient
Mark mode is enabled).
The main motivation for using Transient Mark mode is that this mode
Certain editing commands that normally apply to text near point,
work on the region when Transient Mode is enabled and the mark is
active. This is the main motivation for using Transient Mark mode.
Another motivation for using Transient Mark mode is that this mode
also enables highlighting of the region when the mark is active.
@xref{Display}.
@ -555,6 +559,11 @@ every buffer-modifying primitive sets @code{deactivate-mark}. The
consequence of this is that commands that modify the buffer normally
make the mark inactive.
Certain commands normally apply to text near point, but in Transient
Mark mode when the mark is active, they apply to the region instead.
These commands should call @code{use-region-p} to test whether they
should operate on the region.
Lisp programs can set @code{transient-mark-mode} to non-@code{nil},
non-@code{t} values to enable Transient Mark mode temporarily. If the
value is @code{lambda}, Transient Mark mode is automatically turned
@ -566,6 +575,14 @@ any subsequent command that moves point and is not shift-translated
action that would normally deactivate the mark.
@end defopt
@deffn Subroutine use-region-p
This function returns @code{t} if Transient Mark mode is enabled, the
mark is active, and there's a valid region in the buffer. Commands
that operate on the region (instead of on text near point) when
there's an active mark should use this subroutine to test whether to
do that.
@end deffn
@defopt mark-even-if-inactive
If this is non-@code{nil}, Lisp programs and the Emacs user can use the
mark even when it is inactive. This option affects the behavior of
@ -598,8 +615,11 @@ Otherwise it does nothing.
@end defun
@defvar mark-active
The mark is active when this variable is non-@code{nil}. This variable
is always buffer-local in each buffer.
The mark is active when this variable is non-@code{nil}. This
variable is always buffer-local in each buffer. Do @emph{not} use the
value of this variable to decide whether a command that normally
operates on text near point should operate on the region instead. Use
the @code{use-region-p} subroutine (see above) for that.
@end defvar
@defvar activate-mark-hook

1
etc/NEWS
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@ -1177,6 +1177,7 @@ interactive forms to subroutines.
** Region changes
+++
*** Commands should use `use-region-p' to test whether there is
an active region that they should operate on.