Re: Setting truncate-lines based on file type (extension)

[Kevin Rodgers <kevin.d.rodgers@gmail.com>]

amicitas wrote:
> On Sep 29, 11:00 pm, Kevin Rodgers <kevin.d.rodg...@gmail.com> wrote:
>> amicitas wrote:
>>> For certain types of files I want to set truncate-lines to true.  I
>>> would like to be able to specify these files based on the file
>>> extension.  While I know how to set the mode, but how would I go about
>>> changing settings?
>> (defun my-set-truncate-lines ()
>>    "Set `truncate-lines' to t when visiting a file whose extension is
>> \"ext1\", \"ext2\", or \"ext3\"."
>>    (when (member (file-name-extension buffer-file-name)
>>                 '("ext1" "ext2" "ext3"))
>>      (setq truncate-lines t))
>>    ;; return value for find-file-not-found-hooks:
>>    nil)
>>
>> (add-hook 'find-file-hook 'my-set-truncate-lines)
>> (add-hook 'find-file-not-found-functions 'my-set-truncate-lines)
> 
> Thank you Kevin.  That is precisely what I was looking for.
> 
> In my case I am using this to make viewing of certain types of data
> and calibration files easier.   These files should be opened in 'text-
> mode', except with out wrapping.  Setting a mode hook is therefore not
> appropriate.  This seems like a better solution that creating (or
> finding) a 'data-mode'.

I don't know: define-derived-mode makes it very easy to define your data-mode,
which would set truncate-lines directly.

Alternatively, there's no reason not to put the hook function on
text-mode-hook instead of find-file-hook and find-file-not-found-functions.

-- 
Kevin Rodgers
Denver, Colorado, USA