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Improve documentation of 'defcustom's :set keyword

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* lisp/custom.el (defcustom):
* doc/lispref/customize.texi (Variable Definitions): Improve the
documentation of the :set keyword in 'defcustom'.
This commit is contained in:
Eli Zaretskii 2023-03-30 09:09:43 +03:00
parent ab4273056e
commit 9b32bc134c
2 changed files with 11 additions and 2 deletions
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9
doc/lispref/customize.texi
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@ -378,8 +378,15 @@ the option as a Lisp variable); preferably, though, it should not
modify its value argument destructively. The default for
@var{setfunction} is @code{set-default-toplevel-value}.
If defined, @var{setfunction} will also be called when evaluating a
@code{defcustom} form with @kbd{C-M-x} in Emacs Lisp mode and when the
@var{option}'s value is changed via the @code{setopt} macro
(@pxref{Setting Variables, setopt}).
If you specify this keyword, the variable's documentation string
should describe how to do the same job in hand-written Lisp code.
should describe how to do the same job in hand-written Lisp code,
either by invoking @var{setfunction} directly or by using
@code{setopt}.
@item :get @var{getfunction}
@kindex get@r{, @code{defcustom} keyword}

4
lisp/custom.el
View File

@ -280,7 +280,9 @@ The following keywords are meaningful:
when using the Customize user interface. It takes two arguments,
the symbol to set and the value to give it. The function should
not modify its value argument destructively. The default choice
of function is `set-default-toplevel-value'.
of function is `set-default-toplevel-value'. If this keyword is
defined, modifying the value of SYMBOL via `setopt' will call the
function specified by VALUE to install the new value.
:get VALUE should be a function to extract the value of symbol.
The function takes one argument, a symbol, and should return
the current value for that symbol. The default choice of function