How to check if point is on a line starting a hidden paragraph?

How to check if point is on a line starting a hidden paragraph?

[Tassilo Horn]

Hi all,

I need a predicate that checks if the current line after which some
hidden text follows.  I mean those lines ending in an artificial `...'.

Concrete examples are outlines whose contents are hidden, or lines in
gnus summary buffers whose subthread is hidden, or lines after which
more indented text is hidden when using selective-display.

Any ideas?

Bye,
Tassilo

Re: How to check if point is on a line starting a hidden paragraph?

[Teemu Likonen]

* 2010-07-21 19:47 (+0200), Tassilo Horn wrote:

> I need a predicate that checks if the current line after which some
> hidden text follows. I mean those lines ending in an artificial `...'.
>
> Concrete examples are outlines whose contents are hidden, or lines in
> gnus summary buffers whose subthread is hidden, or lines after which
> more indented text is hidden when using selective-display.

Something like this perhaps?

    (defun invisible-text-starts-from-this-line-p ()
      (save-excursion
        (goto-char (line-end-position))
        (invisible-p (point))))

Re: How to check if point is on a line starting a hidden paragraph?

[Teemu Likonen]

* 2010-07-21 20:59 (+0300), Teemu Likonen wrote:

>     (defun invisible-text-starts-from-this-line-p ()
>       (save-excursion
>         (goto-char (line-end-position))
>         (invisible-p (point))))

I wrote too quickly. That can be simplified:

    (defun invisible-text-starts-here-p ()
      (invisible-p (line-end-position)))

Re: How to check if point is on a line starting a hidden paragraph?

[Tassilo Horn]

Teemu Likonen <tlikonen@iki.fi> writes:

Hi Teemu,

> I wrote too quickly. That can be simplified:
>
>     (defun invisible-text-starts-here-p ()
>       (invisible-p (line-end-position)))

Perfectly.  Thanks a lot.

Bye,
Tassilo