New gum spin feature --box-output

[dacbd]

I love the gum suite of tools for building better/interactive bash scripts, so thank so much for make the tool!

BLUF:

I want a version of gum spin that works with --show-output, --show-stdout, and --show-stderr that ensure the spinner stays on the screen.

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I have a multi-stage bash script which I want to continually monitor the progress in each "stage" there are a few long running commands that can produce a lot of output which also serve as an indictor to it's progression. So I want to see both the spinner's --title which helps indicate the current stage and the output of that command, but currently the spinner get pushed off the window by the commands output.

I want to open a PR implementing this feature if it is something the team feels would be useful or do you think this creeps beyond the intent of gum spin

Command Ex: gum spin --show-output --box-output --title "Some title" -- ...

Example screenshots:

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Should this be deemed useful enough for others what other customization options should apply to the viewport box? looking at gum pager as a reference. Additionally considering some kind of --max-lines option for the viewport box to hold, ex the last 10 lines of the commands output. That way the viewport box doesn't consume the whole screen.

example patch:

reference.patch

Finally, If there is interest I will clean up the implementation I have and open a PR

[ser]

I would love to have this in gum