Re: [AUCTeX-devel] [hook does not work]

[Tassilo Horn]

Uwe Brauer <address@hidden> writes:

Hi Uwe,

> Well well
>
>   (add-hook 'LaTeX-mode-hook 'TeX-source-correlate-mode)
>
> This does not work 
> ,----
> | 
> | `LaTeX-mode-hook' is a variable declared in Lisp.
> |   -- loaded from "latex"
> | 
> | Value: (preview-mode-setup turn-on-auto-revert-mode
> | turn-on-my-footnote-mode turn-on-flyspell my-install-latex-toolbar
> | my-set-auto-capitalize turn-on-auto-capitalize-mode turn-on-cdlatex
> | my-latex-xsymbol-8bit turn-on-reftex my-LaTeX-TeX-add-symbols
> | TeX-source-correlate-mode my-latex-mode-key)
> | 
> | Documentation:
> | A hook run in LaTeX mode buffers.
> `----
>
>  But in a Latex buffer I obtain
>
> ,----
> | 
> | `TeX-source-correlate-mode' is a variable declared in Lisp.
> |   -- loaded from "tex"
> | 
> | Value: nil
> | 
> | Documentation:
> | Non-nil if Tex-Source-Correlate mode is enabled.
> | See the command `TeX-source-correlate-mode' for a description of this 
> minor-mode.
> | Setting this variable directly does not take effect;
> | use either M-? C or the function `TeX-source-correlate-mode'.
> `----
>
> Is this a bug?

I can't reproduce that.  With a fresh emacs on a test account with
auctex from ELPA, with no settings in ~/.emacs except for

  (add-hook 'LaTeX-mode-hook 'TeX-source-correlate-mode)

emacs foo.tex will activate `TeX-source-correlate-mode', i.e., its value
is t.

Could be a specific of XEmacs maybe?

For (at least recent) Emacs versions, all minor mode obey this calling
convention:

,----
| When called from Lisp, the mode command toggles the mode if the
| argument is `toggle', disables the mode if the argument is a
| non-positive integer, and enables the mode otherwise (including
| if the argument is omitted or nil or a positive integer).
`----

I think with older emacs versions and XEmacs, calling a minor mode
function without argument toggles it.  So maybe you have
`TeX-source-correlate-mode' in two hooks that are run for tex files,
e.g., in both `TeX-mode-hook' and `LaTeX-mode-hook', so that the first
toggles it on and the second off again?

Bye,
Tassilo

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