* Setting truncate-lines based on file type (extension)
@ 2009-09-28 20:11 amicitas
2009-09-30 6:00 ` Kevin Rodgers
[not found] ` <mailman.7740.1254290461.2239.help-gnu-emacs@gnu.org>
0 siblings, 2 replies; 5+ messages in thread
From: amicitas @ 2009-09-28 20:11 UTC (permalink / raw)
To: help-gnu-emacs
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?
Thanks in advance,
-- amicitas
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Setting truncate-lines based on file type (extension)
2009-09-28 20:11 Setting truncate-lines based on file type (extension) amicitas
@ 2009-09-30 6:00 ` Kevin Rodgers
[not found] ` <mailman.7740.1254290461.2239.help-gnu-emacs@gnu.org>
1 sibling, 0 replies; 5+ messages in thread
From: Kevin Rodgers @ 2009-09-30 6:00 UTC (permalink / raw)
To: help-gnu-emacs
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)
--
Kevin Rodgers
Denver, Colorado, USA
^ permalink raw reply [flat|nested] 5+ messages in thread
[parent not found: <mailman.7740.1254290461.2239.help-gnu-emacs@gnu.org>]
* Re: Setting truncate-lines based on file type (extension)
[not found] ` <mailman.7740.1254290461.2239.help-gnu-emacs@gnu.org>
@ 2009-09-30 13:51 ` John A Pershing Jr
2009-09-30 20:09 ` amicitas
1 sibling, 0 replies; 5+ messages in thread
From: John A Pershing Jr @ 2009-09-30 13:51 UTC (permalink / raw)
To: help-gnu-emacs
Kevin Rodgers <kevin.d.rodgers@gmail.com> writes:
> 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)
If you *really* want this to be based on file extension, then Kevin
Rodgers's suggestion is fine. However, if you actually want to set
truncate-lines (and, prehaps, word-wrap) based on the *type* of the file
(e.g., 'text' versus 'Java'), then note that most (all?) of the major
modes allow you to register hooks for that mode, so you can add a
one-liner (which sets truncate-lines to whatever value you want) to the
various mode hooks. E.g., 'java-mode' sets it to 't, 'text-mode' leaves
it as nil and sets word-wrap to 't, etc.
An additional advantage is that this gets applied to buffers that are
not associated with a file -- e.g., the Gnus message buffer (which is an
extension of 'text-mode').
Note that the "mode" of a buffer is partially related to the file
extension, but can also be determined by several other factors. Using
mode hooks is *probably* what you really want.
-jp
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Setting truncate-lines based on file type (extension)
[not found] ` <mailman.7740.1254290461.2239.help-gnu-emacs@gnu.org>
2009-09-30 13:51 ` John A Pershing Jr
@ 2009-09-30 20:09 ` amicitas
2009-10-01 12:11 ` Kevin Rodgers
1 sibling, 1 reply; 5+ messages in thread
From: amicitas @ 2009-09-30 20:09 UTC (permalink / raw)
To: help-gnu-emacs
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)
>
> --
> Kevin Rodgers
> Denver, Colorado, USA
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'.
Thanks again
-- amicitas
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Setting truncate-lines based on file type (extension)
2009-09-30 20:09 ` amicitas
@ 2009-10-01 12:11 ` Kevin Rodgers
0 siblings, 0 replies; 5+ messages in thread
From: Kevin Rodgers @ 2009-10-01 12:11 UTC (permalink / raw)
To: help-gnu-emacs
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
^ permalink raw reply [flat|nested] 5+ messages in thread
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2009-09-28 20:11 Setting truncate-lines based on file type (extension) amicitas
2009-09-30 6:00 ` Kevin Rodgers
[not found] ` <mailman.7740.1254290461.2239.help-gnu-emacs@gnu.org>
2009-09-30 13:51 ` John A Pershing Jr
2009-09-30 20:09 ` amicitas
2009-10-01 12:11 ` Kevin Rodgers
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