Re: [Fish-users] Sticky Fish Prompt Line Below Stdout from Background Process

[Stestagg <ste...@gm...>]

Xterm and compatible terminals have the ability to set the scrolling
region, so it would be theoretically possible to have the scroll region set
to exclude the last line(n lines if the prompt wrapped) while the prompt
was active, and then revert to full-page scrolling when the prompt isn't
active.

I would imagine the management code for this, and the
feature-detection/fallback etc.. would be far more effort than what you'd
gain, however.

Steve


On Wed, Aug 14, 2013 at 10:34 AM, H. Ryan Jones <hry...@gm...>wrote:

> Hi Samfel,
>
>
>> You'll see the output keep scrolling onto the screen, but the fish prompt
>> is left behind and doesn't stick to the bottom of it.
>>
>
> This (in my experience) is usual behavior of shells.  It generally will
> screw things up (visually at least) when you send output to a terminal from
> a process running in the background.  You seem to be suggesting that fish
> should be different in this respect and as new output comes onto the screen
> from a backend process that this would be inserted above the current prompt
> (so new output can be seen, but a command can also be easily typed)?  Am I
> interpreting this correctly?
>
> That seems like a good idea to me, however, one weird situation I can
> envision is where you have a background process generating output while a
> foreground one is also generating output.  In that case it would be
> possible to have foreground output on the screen, while your background
> output was then off screen and essentially two insertion points for output.
>  I don't know exactly why that might be bad, but it seems like it has
> potential to cause problems.* * To try to visually demonstrate:
>
> *This seems like desired behavior & seems nice*
> *
> *
> *$* background_process &
> Background Output line 1
> Background Output... (more output will be appended here)
> *$*      #can type away command with background output happily chugging
> away above
>
> --------
>
> *A weird situation that would be likely to arise from above behavior*
> *
> *
> *$* background_process &
> Background Output
> Background Output... (background output being added into the terminal,
> possibly offscreen)
> *$* foreground_process
> Foreground Output
> Foreground Output... (possibly a lot of output, say pages worth)
>
> Anybody else have thoughts?
>
> -Ryan
>
> __________________________________________
> *(206) 414-8475*
> hryanjones.com
>
>
> On Wed, Aug 7, 2013 at 6:43 AM, Samuel Melrose <sa...@in...> wrote:
>
>> Hello,
>>
>> I've been trying to do something with bash that is starting to seem
>> impossible and I'm hoping fish will come to the rescue.
>>
>> Please see the question asked here:
>> http://serverfault.com/questions/528993/bash-prompt-below-output-background-log-tail
>>
>> And let me give a simple example:
>>
>> In a bash shell, run the following command: while true; do echo `date` >>
>> temp; sleep 3; done
>>
>> Then open your fish shell and run: tail -f temp &
>>
>> You'll see the output keep scrolling onto the screen, but the fish prompt
>> is left behind and doesn't stick to the bottom of it.
>>
>> Do you know of any way you could make it stick to the bottom of the
>> output as it appears? And if it's not a current feature, is it something
>> easy to implement?
>>
>> Thanks.
>>
>> Samuel Melrose
>> sa...@in...
>>
>>
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