Interactive prompts

[adswa]

Here is a very quick and dirty implementation of interactive prompts. I think I will try to intergrate further developments of this in conjunction with a query command. See the comment with the GIF below to see how this feature behaves.

[mih]

Cool! Thx!

Can we get away without having a flag for interactive UI?

I.e.

from datalad.ui import ui
if ui.is_interactive:
    ....

[adswa]

Will do! However, I will delay working on this a bit until a query command has been introduced - maybe the need for interactive prompts doesn't exist anymore with the new command or api change

[codecov-commenter]

Codecov Report

Merging #64 (c6095da) into master (61f760b) will decrease coverage by 2.62%.
The diff coverage is 2.22%.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
- Coverage   82.33%   79.71%   -2.63%     
==========================================
  Files          10       11       +1     
  Lines         334      419      +85     
==========================================
+ Hits          275      334      +59     
- Misses         59       85      +26     

Impacted Files	Coverage Δ
datalad_xnat/init.py	70.00% <0.00%> (-2.59%)	⬇️
datalad_xnat/update.py	73.07% <3.12%> (-12.00%)	⬇️
datalad_xnat/tests/test_init.py	100.00% <0.00%> (ø)
datalad_xnat/parser.py	88.88% <0.00%> (+1.93%)	⬆️
datalad_xnat/platform.py	79.78% <0.00%> (+3.19%)	⬆️

---

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[adswa]

Here's an updated Gif of how this feature looks like:

[adswa]

shall I port this into the current state of the code?

[mih]

I am putting this PR in draft mode for now. It would need to be revived and conflicts removed.

Also pinging datalad/datalad#396 where this could be an awesome way to select to-be-edited items.