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Re: Add a handler
From: |
Germán Arias |
Subject: |
Re: Add a handler |
Date: |
Thu, 24 Apr 2014 01:33:12 -0600 |
User-agent: |
GNUMail (Version 1.2.1) |
On 2014-04-23 00:34:50 -0600 Michael Albinus <michael.albinus@gmx.de> wrote:
> Germán Arias <germanandre@gmx.es> writes:
>
>> Hi,
>
> Hi,
>
>> How add a handler at "file-name-handler-alist"?
>
> 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).
>
> 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:
>
> (defun my-file-name-handler (operation &rest args)
> "Invoke my file name handler."
> (message "my-file-name-handler %s %s" operation args))
>
> Third, you must add both to `file-name-handler-alist as cons cell:
>
> (add-to-list 'file-name-handler-alist
> (cons "handled\\'" 'my-file-name-handler))
>
> If a magic file name operation is called now with a file name matching
> your regexp, your file name handler is called:
>
> (file-exists-p "/path/to/this-file-name-is-handled")
>
> would write into the *Messages* buffer
>
> my-file-name-handler expand-file-name (/path/to/this-file-name-is-handled nil)
>
> That's all. Now you need only to implement all supported operations, see
> (info "(elisp)Magic File Names")
>
> You could also check `file-name-handler-alist' for existing file name
> handlers, and steal^W be inspired by their implementation.
>
>> Thanks.
>
> Best regards, Michael.
>
Thanks, now I can add my handler, but don't seems to work. As you suggest I
will see the existing handlers to take ideas.
Regards.
Germán.