[define-minor-mode] (was: [hook does not work])

> "Tassilo" == Tassilo Horn <tsdh(a)gnu.org&gt; writes:

Uwe Brauer <oub(a)mat.ucm.es&gt; 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?