Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!jr@bbn.com
From: jr@bbn.com (John Robinson)
Newsgroups: comp.emacs
Subject: Re: Question regarding next-line
Keywords: Possibly naive question
Message-ID: <38147@bbn.COM>
Date: 3 Apr 89 14:21:34 GMT
References: <8363@csli.STANFORD.EDU>
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Reply-To: jr@bbn.com (John Robinson)
Distribution: usa
Organization: BBN Systems and Technologies Corporation, Cambridge MA
Lines: 36
In-reply-to: rustcat@csli.STANFORD.EDU (Vallury Prabhakar)

In article <8363@csli.STANFORD.EDU>, rustcat@csli (Vallury Prabhakar) writes:
>1) Why is that the above function next-line inserts a newline character if
>there is no line following it in the buffer?  I had some trouble with it 
>but managed to work around the problem. Still I'm still curious to know 
>why next-line is different from say, forward-char (which doesn't insert a 
>space if necessary) in this respect?  I would've thought that an "End of
>buffer" warning would result in trying to move past (point-max).

This could certainly be argued each way.  A motion command which can
modify the buffer as a side-effect seems like a bad idea.  One
advantage comes when you are inserting an emoty line at the end of the
buffer - the next-line function in effect "gobbles" unseen newlines
past the last printing text as you move downward to the point where
the new paragraph begins.

>2) How do I go about loading a function or a file of functions each time
>the current buffer is changed? That is, I would like these functions to
>be executed from scratch each time a new file is read into the buffer.

Three answers:

1.  If the functions to be loaded (do you mean run?) depend only on
the file type, as implied by the file name or extension, put something
onto auto-mode-alist.

2.  If the functions are the same all the time, make them into a new
major mode and make that your default-major-mode.  If you are simply
setting the major mode to one of the available ones, make that your
default.  I happen to set default-major-mode to 'text-mode, and then
text-mode-hook to 'turn-on-auto-fill.

3.  If it is more complicated than this, use find-file-hooks.
--
/jr
jr@bbn.com or bbn!jr
C'mon big money!