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Document 'save-some-buffers-default-predicate'

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* doc/lispref/files.texi (Saving Buffers):
* doc/emacs/files.texi (Save Commands): Document
save-some-buffers-default-predicate.
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Eli Zaretskii 2017-02-04 11:33:54 +02:00
parent 6db5582479
commit 12a79dc3ce
3 changed files with 21 additions and 10 deletions
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6
doc/emacs/files.texi
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@ -417,6 +417,12 @@ changes you would be saving. This calls the command
Display a help message about these options.
@end table
@noindent
@vindex save-some-buffers-default-predicate
You can customize the value of
@code{save-some-buffers-default-predicate} to control which buffers
Emacs will ask about.
@kbd{C-x C-c}, the key sequence to exit Emacs, invokes
@code{save-some-buffers} and therefore asks the same questions.

24
doc/lispref/files.texi
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@ -368,17 +368,21 @@ asks the user about each buffer. But if @var{save-silently-p} is
non-@code{nil}, it saves all the file-visiting buffers without querying
the user.
The optional @var{pred} argument controls which buffers to ask about
(or to save silently if @var{save-silently-p} is non-@code{nil}).
If it is @code{nil}, that means to ask only about file-visiting buffers.
If it is @code{t}, that means also offer to save certain other non-file
buffers---those that have a non-@code{nil} buffer-local value of
@code{buffer-offer-save} (@pxref{Killing Buffers}). A user who says
@samp{yes} to saving a non-file buffer is asked to specify the file
name to use. The @code{save-buffers-kill-emacs} function passes the
value @code{t} for @var{pred}.
@vindex save-some-buffers-default-predicate
The optional @var{pred} argument provides a predicate that controls
which buffers to ask about (or to save silently if
@var{save-silently-p} is non-@code{nil}). If @var{pred} is
@code{nil}, that means to use the value of
@code{save-some-buffers-default-predicate} instead of @var{pred}. If
the result is @code{nil}, it means ask only about file-visiting
buffers. If it is @code{t}, that means also offer to save certain
other non-file buffers---those that have a non-@code{nil} buffer-local
value of @code{buffer-offer-save} (@pxref{Killing Buffers}). A user
who says @samp{yes} to saving a non-file buffer is asked to specify
the file name to use. The @code{save-buffers-kill-emacs} function
passes the value @code{t} for @var{pred}.
If @var{pred} is neither @code{t} nor @code{nil}, then it should be
If the predicate is neither @code{t} nor @code{nil}, then it should be
a function of no arguments. It will be called in each buffer to decide
whether to offer to save that buffer. If it returns a non-@code{nil}
value in a certain buffer, that means do offer to save that buffer.

1
etc/NEWS
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@ -758,6 +758,7 @@ instead.
* Lisp Changes in Emacs 26.1
+++
** 'save-some-buffers' now uses 'save-some-buffers-default-predicate'
to decide which buffers to ask about, if the PRED argument is nil.
The default value of 'save-some-buffers-default-predicate' is nil,