Format-alist vs. minor mode

Format-alist vs. minor mode

[tomas]

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Hi,

I'm trying to switch on a minor mode via the format-alist feature, like
so:

  (add-to-list 'format-alist
               (list "ZEIT-k4c"
                     "ZEIT k4 cooked XML"
                     "^<\\?xml[^>]*>[^<]*<article>"
                     'am-parse-region
                     'am-unparse-region
                     t
                     'am-mode)
               nil
               (lambda (x y) (equal (car x) (car y))))

It works at first, when the regexp is recognized the mode function is
called... but then "fundamental-mode" sets in, kills all local variables
and reverts the minor mode settings.

What am I doing wrong? Do only major modes work with format-alist?

Thanks
- -- tomás
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Re: Format-alist vs. minor mode

[martin rudalics]

 > It works at first, when the regexp is recognized the mode function is
 > called... but then "fundamental-mode" sets in, kills all local variables
 > and reverts the minor mode settings.

I'm using an `after-change-major-mode-hook' but there are a couple of
glitches.  Look at the speck.el file I sent to emacs-sources a few days
ago and search for `format-alist'.

http://lists.gnu.org/archive/html/gnu-emacs-sources/2008-07/msg00018.html

Re: Format-alist vs. minor mode

[tomas]

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On Fri, Aug 01, 2008 at 02:26:31PM +0200, martin rudalics wrote:
> > [...] but then "fundamental-mode" sets in, kills all local variables
> > and reverts the minor mode settings.
>
> I'm using an `after-change-major-mode-hook' but there are a couple of
> glitches.  Look at the speck.el file I sent to emacs-sources a few days
> ago and search for `format-alist'.
>
> http://lists.gnu.org/archive/html/gnu-emacs-sources/2008-07/msg00018.html

Thanks for the pointer. So I'm not alone with this "problem". How is
that actually supposed to work?

I'll have a peek at speck.el

Regards
- -- tomás
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Re: Format-alist vs. minor mode

[Stefan Monnier]

> I'm trying to switch on a minor mode via the format-alist feature, like
> so:

>   (add-to-list 'format-alist
>                (list "ZEIT-k4c"
>                      "ZEIT k4 cooked XML"
>                      "^<\\?xml[^>]*>[^<]*<article>"
>                      'am-parse-region
>                      'am-unparse-region
>                      t
>                      'am-mode)
>                nil
>                (lambda (x y) (equal (car x) (car y))))

> It works at first, when the regexp is recognized the mode function is
> called... but then "fundamental-mode" sets in, kills all local variables
> and reverts the minor mode settings.

> What am I doing wrong? Do only major modes work with format-alist?

If the minor mode depends on the file/buffer's contents, then it should
survive a change in major-mode, right?  So you might want to make your
minor mode permanent-local.


        Stefan

Re: Format-alist vs. minor mode

[tomas]

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On Sun, Aug 03, 2008 at 01:47:16PM -0400, Stefan Monnier wrote:
> > I'm trying to switch on a minor mode via the format-alist feature, like

> > It works at first, when the regexp is recognized the mode function is
> > called... but then "fundamental-mode" sets in, kills all local variables

[...]

> If the minor mode depends on the file/buffer's contents, then it should
> survive a change in major-mode, right?  So you might want to make your
> minor mode permanent-local.

Thanks, Stefan. I figured that out thanks to the pointers provided by
Martin Rudalics. It was very surprising at the beginning :-)

I guess one wants to do that almost always when doing format
transformations à la format-alist, although those things are not very
related. This explains the misleading subject line.

Do you think a pointer in the doc is appropriate?

Regards
- -- tomás
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Re: Format-alist vs. minor mode

[Stefan Monnier]

> I guess one wants to do that almost always when doing format
> transformations à la format-alist, although those things are not very
> related. This explains the misleading subject line.

> Do you think a pointer in the doc is appropriate?

Could be.


        Stefan