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Re: enriched-mode and switching major modes.

From: Oliver Scholz
Subject: Re: enriched-mode and switching major modes.
Date: Mon, 06 Sep 2004 09:36:21 +0200
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3.50 (windows-nt)

Richard Stallman <address@hidden> writes:

>       `enriched-mode' sets
>     buffer-local values for these variables, but when the major mode is
>     set by `after-find-file', these variables are killed.
> It sounds like enriched-mode is called too early.
> What is the command that you give?
>     One solution is to make Enriched mode into a major mode.  It already
>     very much "feels" like one.
>     The other solution would be to make all variables that Enriched mode
>     needs to set permanent locals.  For `use-hard-newlines' we already
>     decided that there was no problem. 
> The former is acceptable, but not really nice.

IMO opinion enriched-mode actually serves two purposes: (1) editing of
(very restricted) WP-like documents in the format text/enriched (2) a
means to save the colours that appear in a buffer in a file.

The difference is subtle. A usage scenario of type (1) would be, for
example, that I'd want to keep notes with some text properties in a
file. I'd create that file for this purpose, use text-mode as a major
mode, turn on enriched-mode and then specify myself explicitely which
text properties to use with M-g. A usage scenario of type (2) would
be, that I have a buffer that got its text properties from some Elisp
function and I want to save that buffer to a file, while also saving
the text-properties -- or at least the colours. For instance, when I
save my IRC logs (from ERC), I turn on enriched-mode before that.

As (1) enriched-mode should clearly be a major mode IMO, a derivative
of text-mode. If, for instance, a user wants to keep notes in a file
in the format text/enriched, then I can't actually see the point of
having text/enriched as a minor mode that is used together with
text-mode instead of just being a major mode.

As (2) it should be a minor mode, of course. However, currently some
of enriched-mode's features that make it suitable for (1) get in the
way here. For example I can't just turn on enriched-mode in an ERC
buffer, because enriched-mode rebinds RET. As a minor mode, it should
only affect the way a buffer is saved to a file and nothing else.

So I'd suggest to make enriched-mode a major mode and create a new
additional minor mode for the purpose of (2).

There is a technical problem with making it a major mode: currently
format.el expects modes specified in `format-alist' to be minor
modes.  However, fixing this would be an improvement anyways.

But maybe this all can wait until after the release.  I believe that
(1) is the way it is used most of the time.

Oliver Scholz               21 Fructidor an 212 de la Révolution
Ostendstr. 61               Liberté, Egalité, Fraternité!
60314 Frankfurt a. M.       

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