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From: =?iso-8859-1?q?Germ=E1n_Arias?= <germanandre@gmx.es>
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Subject: Re: Add a handler
Date: Thu, 24 Apr 2014 01:33:12 -0600
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On 2014-04-23 00:34:50 -0600 Michael Albinus <michael.albinus@gmx.de> wr=
ote:

> Germ=E1n Arias <germanandre@gmx.es> writes:
>=20
>> Hi,
>=20
> Hi,
>=20
>> How add a handler at "file-name-handler-alist"?
>=20
> First, you shall know which file names the handler is supposed to
> handle. You need a regexp for this, let's say "handled\\'". This would=

> match all files which names have "handled" at their end (it's a stupid=

> example, just for illustration).
>=20
> Second, you need to write a function (the "handler"), which does the
> work. It must have a general argument list, which would cover all
> supported operations. Something like this:
>=20
> (defun my-file-name-handler  (operation &rest args)
>   "Invoke my file name handler."
>   (message "my-file-name-handler %s %s" operation args))
>=20
> Third, you must add both to `file-name-handler-alist as cons cell:
>=20
> (add-to-list 'file-name-handler-alist
>              (cons "handled\\'" 'my-file-name-handler))
>=20
> If a magic file name operation is called now with a file name matching=

> your regexp, your file name handler is called:
>=20
> (file-exists-p "/path/to/this-file-name-is-handled")
>=20
> would write into the *Messages* buffer
>=20
> my-file-name-handler expand-file-name (/path/to/this-file-name-is-hand=
led nil)
>=20
> That's all. Now you need only to implement all supported operations, s=
ee
> (info "(elisp)Magic File Names")
>=20
> You could also check `file-name-handler-alist' for existing file name
> handlers, and steal^W be inspired by their implementation.
>=20
>> Thanks.
>=20
> Best regards, Michael.
>=20

Thanks, now I can add my handler, but don't seems to work. As you sugges=
t I will see the existing handlers to take ideas.

Regards.
Germ=E1n.