V-page. Comp-Sci question: "jumping back in" via V-page: coroutine, continuation, what?

Sometimes, like just a minute ago, I'm reading articles
linked to from eg truthout.org.

I finish the article, hit "h" to go back to
truthout and
its list of articles, but oops, I hit the "h"
TWICE (for
whatever reason), and I'm back in my bookmarks-page, cursor
still sitting at truthout.org.

Question: how to get back to where I was, ie where the
*first* h had
returned me to (from reading an article)?

Currently, I believe, there's no way to get back into
truthout,
*cursor at same point that first h got me to" -- before
being
popped off a presumed stack (hmmm -- I wonder just how that
v-page algorithm works, what data-structure, etc).

Rather, I must again "click" (ie, hit
<return>) the truthout-link,
and I end up at the top of truthout, now down where I had
been
before my extra h.

QUESTION:  What would it take to be able to do just that,
ie
get back to exactly where I had been?


QUESTION: Looking at the V-page "tree", what would
it take
to be able go directly to any of those V-page nodes,
landing there with the cursor at where it had been when I
had last been there?


Hmmm.  We already do have the V-page data structure,
whatever
it is, that shows the path we had been on when we first
hit a node (site).  And if we "click" on it, we'll
end up
at the *top* of that page.

What would we have to save in that V-graph or whatever it
is,
just the number (the square-bracketed numerical label of
the link) we were last at?


And what about after getting back there, we hit h,
what happens?  Do we go to the father-node as shown in the
V-page?

Anyway, interesting questions, with maybe not-so-difficult
solutions.  (Not that I's asking for Lynx to have this
ability -- although it would be useful!)


Thanks for reading this far!  

And any followups are MOST welcome!


David




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On 3/27/08, David Combs <dkcombspanix.com> wrote:
> Question: how to get back to where I was, ie where the
*first* h had
> returned me to (from reading an article)?
>
> Currently, I believe, there's no way to get back into
truthout,
> *cursor at same point that first h got me to" --
before being
> popped off a presumed stack (hmmm -- I wonder just how
that
> v-page algorithm works, what data-structure, etc).
>
It is defined in src/LYHistory.c
> Rather, I must again "click" (ie, hit
<return>) the truthout-link,
> and I end up at the top of truthout, now down where I
had been
> before my extra h.
>
> QUESTION: What would it take to be able to do just
that, ie
> get back to exactly where I had been?
>
In recent lynx, you could use Ctrl+u (NEXT_DOC) to undo
recent h (PREV_DOC). But it works only in active branch of
tree (only through history list) and not inside Visited
links page ie. it is somehow completly different from how it
is done in other browsers.
And that is mainly because they dont do any difference from
History and Visited links - that is same thing for them.
> QUESTION: Looking at the V-page "tree", what
would it take
> to be able go directly to any of those V-page nodes,
> landing there with the cursor at where it had been when
I
> had last been there?
In recent lynx there is (*some kind of*) sessions support,
and if you ever tried that feature, and after that looked at
session file you will notice that lines started with h
(history entries) have always 2 numbers; that is what are
you looking for; first number is rendered document line and
second one is active link. (Rendered document active line
depends on terminal size - so it can be different - and
completely broken after you change terminal size betwen
sesions or during current session ...)
On other hand *Visited Links code* doesnt store last active
link and line.
> Hmmm. We already do have the V-page data structure,
whatever
> it is, that shows the path we had been on when we
first
> hit a node (site). And if we "click" on it,
we'll end up
> at the *top* of that page.
>
> What would we have to save in that V-graph or whatever
it is,
> just the number (the square-bracketed numerical label
of
> the link) we were last at?
It is possible and simple to add.
> And what about after getting back there, we hit h,
> what happens? Do we go to the father-node as shown in
the
> V-page?
PREV_DOC and NEXT_DOC will take in account line and link
number stored in history list - so cursor will be positioned
on last link as it was before last visit. Note that *Visited
Links* list doesnt have nothing with *History* list they are
completely different.
> Anyway, interesting questions, with maybe
not-so-difficult
> solutions. (Not that I's asking for Lynx to have this
> ability -- although it would be useful!)
Could this be enabled by default or via some kind of runtime
option?
> Thanks for reading this far!
>
Thank you for nice idea!


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