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Re: goof in small function where???


From: ken
Subject: Re: goof in small function where???
Date: Tue, 22 Jul 2014 06:28:33 -0400
User-agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

On 07/22/2014 06:02 AM Michael Heerdegen wrote:
ken <address@hidden> writes:

(defun file-name-into-kill-buffer ()
"Put path/filename of current buffer onto kill-ring so to paste
into an X application.  Also display it in minibuffer."
(interactive)
      (let ((str (buffer-file-name)))
        (and str
             (kill-new str)
             (message "Copied filename %s to kill ring" str)))
)

This doesn't work when `kill-new' returns nil, which happens when
`interprogram-cut-function' is nil (which is the default).  Note that
the doc of `kill-new' doesn't say anything about the return value, it
can be anything.

Ergo: the `and' should better be a `when'.

Yes!  That fixed it!!  Thanks very much.

I'm vaguely understanding that the 'and' doesn't evaluate '(message...' when '(kill-new...' returns nil and, since its return value is undefined, it can do on occasion. Replacing 'and' with 'when' ensures '(message...' is evaluated regardless of what '(kill-new...' returns.

Is that about right?


Thanks again.





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