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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 <address@hidden> wrote:

> Germán Arias <address@hidden> 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.




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