How to get asynchronous notifications from Emacs ?

How to get asynchronous notifications from Emacs ?

[David Soulayrol]

Hello,

I'm looking for a way to obtain asynchronous notifications
of emacs actions, like: buffer was closed, displayed buffer has changed,
and so on.

I have discovered emacsclient and gnuserv which both allow me to send
synchronous orders to emacs, but I don't think they can solve my problem.

Do you know if such a tool exists ? If not, can you give me pointers or
preliminary help on how to write this in emacs lisp ? I think I'd have to
open a network connection, and then capture actions to send a message...

Thanks a lot.

David.

Re: How to get asynchronous notifications from Emacs ?

[Matthew Flaschen]

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David Soulayrol wrote:
> Hello,
> 
> I'm looking for a way to obtain asynchronous notifications
> of emacs actions, like: buffer was closed, displayed buffer has changed,
> and so on.

Emacs has hooks for many actions.  For example, kill-buffer-hook is run
when a buffer is closed.  Run C-h f on kill-buffer-hook and add-hook,
and C-h v on after-change-functions.  See also
http://www.delorie.com/gnu/docs/elisp-manual-21/elisp_540.html and
http://www.gnu.org/software/emacs/manual/html_node/Hooks.html .

Remember, emacs can do anything if you ask nicely enough.  Theoretical
limitations do not exist as with other programs. ;)

Matthew Flaschen


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Re: How to get asynchronous notifications from Emacs ?

[David Soulayrol]

Le Sun, 25 Feb 2007 09:16:33 -0500, Matthew Flaschen a écrit:

> David Soulayrol wrote:
>> Hello,
>> 
>> I'm looking for a way to obtain asynchronous notifications
>> of emacs actions, like: buffer was closed, displayed buffer has changed,
>> and so on.
> 
> Emacs has hooks for many actions.  For example, kill-buffer-hook is run
> when a buffer is closed.  Run C-h f on kill-buffer-hook and add-hook,
> and C-h v on after-change-functions.  See also
> http://www.delorie.com/gnu/docs/elisp-manual-21/elisp_540.html and
> http://www.gnu.org/software/emacs/manual/html_node/Hooks.html .

I knew the principles in Emacs, but thanks a lot for this introduction.

So I assume you are not aware of a tool which could be the companion of
gnuserv for my needs ? I'll try to write this down.

> Remember, emacs can do anything if you ask nicely enough.  Theoretical
> limitations do not exist as with other programs. ;)

But it doesn't have a kitchen sink.


> Matthew Flaschen

Thanks.

David.

Re: How to get asynchronous notifications from Emacs ?

[Matthew Flaschen]

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David Soulayrol wrote:
> Le Sun, 25 Feb 2007 09:16:33 -0500, Matthew Flaschen a écrit:
> 
>> David Soulayrol wrote:
>>> Hello,
>>>
>>> I'm looking for a way to obtain asynchronous notifications
>>> of emacs actions, like: buffer was closed, displayed buffer has changed,
>>> and so on.
>> Emacs has hooks for many actions.  For example, kill-buffer-hook is run
>> when a buffer is closed.  Run C-h f on kill-buffer-hook and add-hook,
>> and C-h v on after-change-functions.  See also
>> http://www.delorie.com/gnu/docs/elisp-manual-21/elisp_540.html and
>> http://www.gnu.org/software/emacs/manual/html_node/Hooks.html .
> 
> I knew the principles in Emacs, but thanks a lot for this introduction.
> 
> So I assume you are not aware of a tool which could be the companion of
> gnuserv for my needs ? I'll try to write this down.

I'm afraid I don't know what gnuserv is.  I use regular emacsclient, and
am fairly new to emacs in general.  What exactly do you want to do?
I.E. what's your end goal?

> But it doesn't have a kitchen sink.

Patience.

Matthew Flaschen


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Re: How to get asynchronous notifications from Emacs ?

[Lennart Borgman (gmail)]

Matthew Flaschen wrote:
> David Soulayrol wrote:
>> Le Sun, 25 Feb 2007 09:16:33 -0500, Matthew Flaschen a écrit:
>>
>>> David Soulayrol wrote:
>>>> Hello,
>>>>
>>>> I'm looking for a way to obtain asynchronous notifications
>>>> of emacs actions, like: buffer was closed, displayed buffer has changed,
>>>> and so on.
>>> Emacs has hooks for many actions.  For example, kill-buffer-hook is run
>>> when a buffer is closed.  Run C-h f on kill-buffer-hook and add-hook,
>>> and C-h v on after-change-functions.  See also
>>> http://www.delorie.com/gnu/docs/elisp-manual-21/elisp_540.html and
>>> http://www.gnu.org/software/emacs/manual/html_node/Hooks.html .
>> I knew the principles in Emacs, but thanks a lot for this introduction.
>>
>> So I assume you are not aware of a tool which could be the companion of
>> gnuserv for my needs ? I'll try to write this down.
> 
> I'm afraid I don't know what gnuserv is.  I use regular emacsclient, and
> am fairly new to emacs in general.  What exactly do you want to do?
> I.E. what's your end goal?
> 
>> But it doesn't have a kitchen sink.
> 
> Patience.


Well, if you want to communicate with the kitchen sink you can not do 
that (at least not in both directions) with emacsclient (or gnuclient, 
which is similar in spirit). Emacsclient will only send commands to 
Emacs, it does not take command from Emacs.

What you should do is write a program that can talk and listen on 
standard output resp input. That program can then be run as an inferior 
process (Emacs parlang, a subprocess) in a buffer.

Take a look for example at "shell" command in Emacs for example code.

This way you do not have to buy an Emacs aware kitchen sink.

Re: How to get asynchronous notifications from Emacs ?

[David Soulayrol]

Hello,

Le Mon, 26 Feb 2007 17:42:47 +0100, Lennart Borgman (gmail) a écrit:

> Matthew Flaschen wrote:
>
>> David Soulayrol wrote:
>>> So I assume you are not aware of a tool which could be the companion of
>>> gnuserv for my needs ? I'll try to write this down.
>> 
>> I'm afraid I don't know what gnuserv is.  I use regular emacsclient, and
>> am fairly new to emacs in general.  What exactly do you want to do?
>> I.E. what's your end goal?
>> 
>>> But it doesn't have a kitchen sink.
>> 
>> Patience.
> 
> 
> Well, if you want to communicate with the kitchen sink you can not do 
> that (at least not in both directions) with emacsclient (or gnuclient, 
> which is similar in spirit). Emacsclient will only send commands to 
> Emacs, it does not take command from Emacs.
> 
> What you should do is write a program that can talk and listen on 
> standard output resp input. That program can then be run as an inferior 
> process (Emacs parlang, a subprocess) in a buffer.
> 
> Take a look for example at "shell" command in Emacs for example code.
> 
> This way you do not have to buy an Emacs aware kitchen sink.

I understand now well that gnuserv or emacsclient is only meant at sending
commands to a running instance of Emacs. What I miss is, as I said, to get
information in the opposite way: from Emacs to another process.

My goal is to embed Emacs in pida, a python IDE based on other components.
pida is currently able to embed vim and a pair of other editors.

I'm going to take the time to read about elisp and try to write the
missing piece of my puzzle. Thanks both of you for your help.

David.

Re: How to get asynchronous notifications from Emacs ?

[Lennart Borgman (gmail)]

David Soulayrol wrote:

> I'm going to take the time to read about elisp and try to write the
> missing piece of my puzzle. Thanks both of you for your help.


Read the section about hooks, in Emacs 22 (in late beta test):

    M-: (info "(elisp) Standard Hooks")

Re: How to get asynchronous notifications from Emacs ?

[Thorsten Bonow]

>>>>> "Lennart" == Lennart Borgman <(gmail)" <lennart.borgman@gmail.com>> writes:


    Lennart> Read the section about hooks, in Emacs 22 (in late beta test):

    Lennart>    M-: (info "(elisp) Standard Hooks")

Since David asked what to do "[...] to get information in the opposite way: from
Emacs to another process [...]", I think that Chapter 37 of the Emacs lisp
manual: "Processes" is important, too.

It treats interaction with subprocesses or more general inter process
communication with signals or via networking.

Toto


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