Re: How to go to next line on the screen instead of going to next line in the text?

[Kevin Rodgers]

xz wrote:
> ~~~
> > which means, if I only want turn on this longlines-mode when editing
> > latex/tex file, then I add the following to .emacs:
> > (add-hook 'tex-mode-hook 'longlines-mode)
> >
> > Is that correct?
> > But it seems not working......
>
> I mean it works when I add
> (add-hook 'text-mode-hook 'longlines-mode)
>
> while it does work if I only add
> (add-hook 'tex-mode-hook 'longlines-mode)
>
>
> > > Here's the second way:
> > > (add-hook 'find-file-hook 'longlines-mode)
> > > (add-hook 'find-file-not-found-functions 'longlines-mode)

Many text-editing (major) modes besides Text mode call text-mode-hook,
including Plain Tex, LaTex, and SliTex modes (try `M-x
apropos-documentation RET text-mode-hook RET').  And the various Tex
modes then call tex-mode-hook, and then their specific mode hook
(e.g. plain-tex-mode-hook).

Since longlines-mode toggles Long Lines (minor) mode, having the
function on both text-mode-hook and tex-mode-hook turns it on and then
off in a Tex buffer.

So if you only want it on in Tex modes, put longlines-mode on
tex-mode-hook only.  Or if you want it on in all text editing modes
(including Tex modes), put longlines-mode on text-mode-hook only.

If you'd rather avoid having to remember all that, it's better to use a
function on those hooks that unconditionally turns it on.  Many minor
modes have turn-on-foo-mode and turn-off-foo-mode convenience functions
for that purpose, but you can fake it with an anonymous function:

    (add-hook 'text-mode-hook (lambda () (longlines-mode 1)))
    (add-hook 'tex-mode-hook (lambda () (longlines-mode 1)))

or define your own convenience function and use that instead:

    (defun turn-on-longlines-mode ()
      "Turn on Long Lines mode."
      (longlines-mode 1))
    (add-hook 'text-mode-hook 'turn-on-longlines-mode)
    (add-hook 'tex-mode-hook 'turn-on-longlines-mode)

--
Kevin Rodgers
Denver, Colorado, USA