How to obtain customize :type for an option at runtime?

How to obtain customize :type for an option at runtime?

[Drew Adams]

How can I determine, for a given user option, what its Customize :type is?

For example, function `user-variable-p' tests whether a symbol is a user
option, but what if I want to test whether a variable is a toggle (binary)
option?

Although not all options that can act as toggles are defined with a simple
":type 'boolean" in Customize (far from it, and there are good reasons for
that), obtaining such :type info would be a start.

Re: How to obtain customize :type for an option at runtime?

[Lennart Borgman]

Drew Adams wrote:
> How can I determine, for a given user option, what its Customize :type is?
>
> For example, function `user-variable-p' tests whether a symbol is a user
> option, but what if I want to test whether a variable is a toggle (binary)
> option?
>
> Although not all options that can act as toggles are defined with a simple
> ":type 'boolean" in Customize (far from it, and there are good reasons for
> that), obtaining such :type info would be a start.
>   
It is in the symbol property list:

    (get 'your-symbol 'custom-type)

Re: How to obtain customize :type for an option at runtime?

[John Paul Wallington]

"Drew Adams" <drew.adams@oracle.com> writes:

> How can I determine, for a given user option, what its Customize :type is?

Examine its `custom-type' property.

RE: How to obtain customize :type for an option at runtime?

[Drew Adams]

    > How can I determine, for a given user option, what its
    > Customize :type is?

    Examine its `custom-type' property.

Thanks a lot John-Paul - just what I needed.

I guess this is another one of those things that you need to search the
source code to find - it's not in the Elisp manual.