add-hook without need for intermediate functions

add-hook without need for intermediate functions

[uzibalqa]

I have seen that since Emacs 24.1 one does not need the intermediate 'turn-on-foo-mode' 
style functions when using hooks.

Does this apply to all modes, including minor modes ?

And thusly one can write

(add-hook 'emacs-lisp-mode-hook #'foo-minor-mode)

RE: [External] : add-hook without need for intermediate functions

[Drew Adams]

> I have seen that since Emacs 24.1 one does not need the intermediate
> 'turn-on-foo-mode' style functions when using hooks.
> 
> Does this apply to all modes, including minor modes ?
> And thusly one can write
> (add-hook 'emacs-lisp-mode-hook #'foo-minor-mode)

See `define-globalized-minor-mode'.

https://www.gnu.org/software/emacs/manual/html_node/elisp/Defining-Minor-Modes.html

RE: [External] : add-hook without need for intermediate functions

[uzibalqa]

------- Original Message -------
On Saturday, June 10th, 2023 at 4:56 AM, Drew Adams <drew.adams@oracle.com> wrote:


> > I have seen that since Emacs 24.1 one does not need the intermediate
> > 'turn-on-foo-mode' style functions when using hooks.
> > 
> > Does this apply to all modes, including minor modes ?
> > And thusly one can write
> > (add-hook 'emacs-lisp-mode-hook #'foo-minor-mode)
> 
> 
> See `define-globalized-minor-mode'.
> 
> https://www.gnu.org/software/emacs/manual/html_node/elisp/Defining-Minor-Modes.html

I do not follow how to extract the information in your link to answer my question.
My focus is only about a simple minor mode rather than a globalised one. 

RE: [External] : add-hook without need for intermediate functions

[Drew Adams]

> I do not follow how to extract the information in your link to answer my
> question.
> My focus is only about a simple minor mode rather than a globalised one.

Reread what you asked:

 Does not needing a `turn-on-foo-mode' function
 apply to all modes, including minor modes?

The doc I cited tells you that that not-needing
doesn't apply to globalized minor modes.

That's the only occurrence of "turn-on" in the
Elisp manual.

RE: [External] : add-hook without need for intermediate functions

[uzibalqa]

------- Original Message -------
On Saturday, June 10th, 2023 at 5:15 AM, Drew Adams <drew.adams@oracle.com> wrote:


> > I do not follow how to extract the information in your link to answer my
> > question.
> > My focus is only about a simple minor mode rather than a globalised one.
> 
> 
> Reread what you asked:
> 
> Does not needing a `turn-on-foo-mode' function
> apply to all modes, including minor modes?
> 
> The doc I cited tells you that that not-needing
> doesn't apply to globalized minor modes.
> 
> That's the only occurrence of "turn-on" in the
> Elisp manual.


I mean this 

(add-hook 'emacs-lisp-mode-hook #'foo-minor-mode)

versus this

(defun turn-on-foo ()
  "Enable foo"
  (foo-minor-mode 1)
)

(add-hook 'emacs-lisp-mode-hook #'turn-on-foo)

Re: [External] : add-hook without need for intermediate functions

[Emanuel Berg]

Drew Adams wrote:

> The doc I cited tells you that that not-needing doesn't
> apply to globalized minor modes.

What's a globalized minor mode?

-- 
underground experts united
https://dataswamp.org/~incal

Re: add-hook without need for intermediate functions

[Platon Pronko]

On 2023-06-09 23:48, uzibalqa wrote:
> 
> I have seen that since Emacs 24.1 one does not need the intermediate 'turn-on-foo-mode'
> style functions when using hooks.
> 
> Does this apply to all modes, including minor modes ?
> 
> And thusly one can write
> 
> (add-hook 'emacs-lisp-mode-hook #'foo-minor-mode)
> 
> 
> 

foo-minor-mode is just a function, so it is called when hook executes. Any other modes that are turned on via a single function call will also "work".

However note that this won't work for your use-case (from previous thread) - hook is called both when mode is turned on, and when it is turned off. So in your code snippet foo-minor-mode will be turned on when emacs-lisp-mode is turned off, which is probably not something you would want.

-- 
Best regards,
Platon Pronko
PGP 2A62D77A7A2CB94E

Re: add-hook without need for intermediate functions

[uzibalqa]

------- Original Message -------
On Saturday, June 10th, 2023 at 8:20 PM, Platon Pronko <platon7pronko@gmail.com> wrote:


> On 2023-06-09 23:48, uzibalqa wrote:
> 
> > I have seen that since Emacs 24.1 one does not need the intermediate 'turn-on-foo-mode'
> > style functions when using hooks.
> > 
> > Does this apply to all modes, including minor modes ?
> > 
> > And thusly one can write
> > 
> > (add-hook 'emacs-lisp-mode-hook #'foo-minor-mode)
> 
> 
> foo-minor-mode is just a function, so it is called when hook executes. Any other modes that are turned on via a single function call will also "work".
> 
> However note that this won't work for your use-case (from previous thread) - hook is called both when mode is turned on, and when it is turned off. So in your code snippet foo-minor-mode will be turned on when emacs-lisp-mode is turned off, which is probably not something you would want. - Platon Pronko


What would one do then, remove the hook at some point.  Would you show me an example on how to handle the situation
properly.

RE: [External] : add-hook without need for intermediate functions

[Drew Adams]

> > The doc I cited tells you that that not-needing
> > [a TURN-ON function] doesn't apply to globalized
> > minor modes.
> 
> What's a globalized minor mode?

Ask Emacs:

 C-h i m Elisp RET

 i globali TAB RET

____

You can define a global minor mode directly
(from scratch), with macro `define-minor-mode'
and keyword arg `:global t'.

You can define a global minor mode indirectly,
based on a buffer-local minor mode, with macro
`define-globalized-minor-mode'.  For this you
need to provide a TURN-ON function.
____

Turn on, tune in, drop out - globally or buffer
locally.

Re: add-hook without need for intermediate functions

[Platon Pronko]

>> However note that this won't work for your use-case (from previous thread) - hook is called both when mode is turned on, and when it is turned off. So in your code snippet foo-minor-mode will be turned on when emacs-lisp-mode is turned off, which is probably not something you would want. - Platon Pronko
> 
> What would one do then, remove the hook at some point.  Would you show me an example on how to handle the situation
> properly.
> 

Here's an example I've sent in one of previous emails:

(defun tematika--toggle-outline-mode ()
   (if tematika-minor-mode
       (outline-minor-mode)
     (outline-minor-mode -1)))
(add-hook 'tematika-minor-mode-hook 'tematika--toggle-outline-mode)