Re: add-hook

[Dmitry Gutov]

Barry Margolin <barmar@alum.mit.edu> writes:

> In article <mailman.18346.1359173059.855.help-gnu-emacs@gnu.org>,
>  Dmitry Gutov <dgutov@yandex.ru> wrote:
>
>> "Drew Adams" <drew.adams@oracle.com> writes:
>> > If HOOK is void then it is initialized to nil.
>> >
>> > (add-hook 'ruby-mode-hook (lambda () (ruby-electric-mode t)))
>> 
>> Or, even shorter:
>> 
>> (add-hook 'ruby-mode-hook 'ruby-electric-mode)
>
> Not the same. With no argument it toggles, with an argument it turns the 
> mode on or off as specified by the argument.

Not really. It toggles only when the mode function is called
interactively. Otherwise, a no-argument call always means "turn on".

Try to eval this a few times, for example: (linum-mode)

In the context of ruby-electric this is irrelevant anyway, though, since
it doesn't have a concept of turning off. Whenever called, it just
modifies ruby-mode-map to use its electric commands.