How to get hook var of the current major mode?

How to get hook var of the current major mode?

[netjunegg2]

I want to do somthing like this:
(let ((hook (get--the--current--major--mode--hook)))
   (add-hook hook (lambda ()
                    (setq truncate-lines t))))

Re: How to get hook var of the current major mode?

[Dmitry Gutov]

"netjunegg2@gmail.com" <netjunegg2@gmail.com> writes:

> I want to do somthing like this:
> (let ((hook (get--the--current--major--mode--hook)))
>   (add-hook hook (lambda ()
>                    (setq truncate-lines t))))

If the major mode is already current, then the hook has already run,
hasn't it? Adding a lambda to it will have to effect on the next buffer
in the same mode. And if the above form is run many times, each time a
new lambda will be added to the hook.

But anyway, try (intern (format "%s-hook" major-mode)).

Re: How to get hook var of the current major mode?

[Jun]

On 05/18/2013 01:38 PM, Dmitry Gutov wrote:
> "netjunegg2@gmail.com" <netjunegg2@gmail.com> writes:
>
>> I want to do somthing like this:
>> (let ((hook (get--the--current--major--mode--hook)))
>>    (add-hook hook (lambda ()
>>                     (setq truncate-lines t))))
> If the major mode is already current, then the hook has already run,
> hasn't it? Adding a lambda to it will have to effect on the next buffer
> in the same mode. And if the above form is run many times, each time a
> new lambda will be added to the hook.
>
> But anyway, try (intern (format "%s-hook" major-mode)).
> .
>
This is what I want.  In fact, I have defined a function which turns on 
yasnippet minor mode, auto complete mode, etc, and a macro which can run 
some code for all buffers in the same mode as the current. I want to 
turn on some modes only when editing source code, not when viewing, and 
not for buffers other than source code, which is not too usefull for 
chinese.
Thank you.

Re: How to get hook var of the current major mode?

[Emanuel Berg]

Dmitry Gutov <dgutov@yandex.ru> writes:

>> I want to do somthing like this:
>> (let ((hook (get--the--current--major--mode--hook)))
>>   (add-hook hook (lambda ()
>>                    (setq truncate-lines t))))
>
> ...And if the above form is run many times, each time a new lambda
> will be added to the hook.

When the hook fires, are all those lambda executed (doing the same
thing)?

-- 
Emanuel Berg - programmer (hire me! CV below)
computer projects: http://user.it.uu.se/~embe8573
internet activity: http://home.student.uu.se/embe8573

Re: How to get hook var of the current major mode?

[Dmitry Gutov]

Emanuel Berg <embe8573@student.uu.se> writes:

> Dmitry Gutov <dgutov@yandex.ru> writes:
>
>>> I want to do somthing like this:
>>> (let ((hook (get--the--current--major--mode--hook)))
>>>   (add-hook hook (lambda ()
>>>                    (setq truncate-lines t))))
>>
>> ...And if the above form is run many times, each time a new lambda
>> will be added to the hook.
>
> When the hook fires, are all those lambda executed (doing the same
> thing)?

Actually, sorry, I take that back. Even in lexical-binding environment,
(lambda () (abc)) is `equal' to another (lambda () (abc)), at least
currently. And `add-hook' checks if the given function is already
present in the list, with `member'. So there won't be duplicates in the
hook value.

Still, like I wrote previously, adding function to the hook of the
current major mode doesn't make much sense.

Re: How to get hook var of the current major mode?

[Emanuel Berg]

"netjunegg2@gmail.com" <netjunegg2@gmail.com> writes:

> I want to do somthing like this:
>
> (let ((hook (get--the--current--major--mode--hook)))
>   (add-hook hook (lambda ()
>                    (setq truncate-lines t))))

I don't know, but if you want for lots of modes an easier way would be:

(set-default 'truncate-lines 1)

-- 
Emanuel Berg - programmer (hire me! CV below)
computer projects: http://user.it.uu.se/~embe8573
internet activity: http://home.student.uu.se/embe8573