Experimental UI mode for skaffold dev

[dgageot]

Please have a try and tell me what you think about it!

[codecov-io]

Codecov Report

Merging #1533 into master will decrease coverage by 0.61%.
The diff coverage is 8.75%.

@@            Coverage Diff             @@
##           master    #1533      +/-   ##
==========================================
- Coverage   46.88%   46.27%   -0.62%     
==========================================
  Files         118      118              
  Lines        5042     5109      +67     
==========================================
  Hits         2364     2364              
- Misses       2446     2512      +66     
- Partials      232      233       +1

Impacted Files	Coverage Δ
pkg/skaffold/config/options.go	88.23% <ø> (ø)	⬆️
cmd/skaffold/app/cmd/dev.go	0% <0%> (ø)	⬆️
pkg/skaffold/color/formatter.go	72.72% <0%> (-7.28%)	⬇️
pkg/skaffold/kubernetes/log.go	6.55% <0%> (ø)	⬆️
pkg/skaffold/runner/dev.go	56.52% <87.5%> (ø)	⬆️

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[balopat]

I like the visual separation a lot and it gives a foundation for a "dashboard" kind of view that we can implement iteratively on top of this direction. Has a lot of potential.

I really don't like that I can't scroll up - I'm losing history basically.
I think if we figure out scrolling we can merge this.
I would also like to see a "legend" describing "Ctrl + C can exit" or similar.

[dgageot]

@balopat I'll try to see how this can be improved. I was thinking we could merge this code if an experimental flag can be used to activate this UI. wdyt?

[balopat]

I'm okay having behind an experimental flag!

[dgageot]

@balopat should be good to review then

[tjerkw]

This feature is broken for me:

skaffold dev --experimental-gui
FATA[0034] exiting dev mode because first run failed: build failed: building [quay.io/tiqets/tiqetsweb-solr]: build artifact: running build: signal: broken pipe

I'm also expected a proper GUI. But this is just a text-interface :p

[josefkorbel]

I really like it to be honest, good work! Having problems only with scrolling (history loss) as mentioned before.