adding hook to auto-mode-alist load

adding hook to auto-mode-alist load

[Todd Wylie]

Greetings-

I recently changed my dot-file to automatically invoke paragraph-indent-text-mode for files of type *.plan like so:

(setq auto-mode-alist (cons '("\.plan$" . paragraph-indent-text-mode) auto-mode-alist))

But, I'd also like to load auto-fill-mode just for this type of file. Can I add a text-mode-hook for this setup?

Kind regards,
TW

Re: adding hook to auto-mode-alist load

[Lute Kamstra]

Todd Wylie <twylie@watson.wustl.edu> writes:

> I recently changed my dot-file to automatically invoke
> paragraph-indent-text-mode for files of type *.plan like so:
>
> (setq auto-mode-alist (cons '("\.plan$" . paragraph-indent-text-mode)
> auto-mode-alist))
>
> But, I'd also like to load auto-fill-mode just for this type of
> file. Can I add a text-mode-hook for this setup?

auto-mode-alist can be used to associate a certain type of file with a
major mode.  Every major mode has a hook variable that can be used to
customize that major mode.  In this case you can do

(add-hook 'paragraph-indent-text-mode-hook (lambda () (auto-fill-mode 1)))

to automatically start the auto-fill minor mode whenever you start the
paragraph-indent-text major mode.  If you want auto-fill-mode started
only for .plan files and not for other files that are put in
paragraph-indent-text-mode, then you could start auto-fill-mode
conditionally (e.g., write a function to do this and put this function
on paragraph-indent-text-mode-hook).

  Lute.

-- 
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Re: adding hook to auto-mode-alist load

[Johan Bockgård]

Lute Kamstra <Lute.Kamstra@cwi.nl> writes:

> In this case you can do
>
> (add-hook 'paragraph-indent-text-mode-hook (lambda () (auto-fill-mode 1)))
>
> to automatically start the auto-fill minor mode whenever you start
> the paragraph-indent-text major mode. If you want auto-fill-mode
> started only for .plan files and not for other files that are put in
> paragraph-indent-text-mode, then you could start auto-fill-mode
> conditionally (e.g., write a function to do this and put this
> function on paragraph-indent-text-mode-hook).

AFAICS auto-mode-alist just specifies a function to call. Is there any
reason the following is not a good idea?

(defun foo ()
  (paragraph-indent-text-mode)
  (turn-on-auto-fill))

(setq auto-mode-alist (cons '("\.plan$" . foo) auto-mode-alist))

You could call foo `plan-mode' if you like.

-- 
Johan Bockgård

Re: adding hook to auto-mode-alist load

[Lute Kamstra]

bojohan+news@dd.chalmers.se (Johan Bockgård) writes:

> AFAICS auto-mode-alist just specifies a function to call. Is there any
> reason the following is not a good idea?
>
> (defun foo ()
>   (paragraph-indent-text-mode)
>   (turn-on-auto-fill))
>
> (setq auto-mode-alist (cons '("\.plan$" . foo) auto-mode-alist))

Apart from the fact that it's better to use 

(add-to-list 'auto-mode-alist '("\.plan$" . foo))

in case you eval your .emacs more than once, this seems like a fine
solution to me.

  Lute.

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