[GP CLI] Allow explicity and automated disabling of output colorization

[andreafalzetti]

Description

This PR updates the commands of gitpod-cli which use output colorization, making it explicitly disabled when requested by the user (via --no-color) or automatically (when stdin/stdout detected or for other community/standard conditions) [1].

Related Issue(s)

Fixes #10633
Related #9930

How to test

1. Open the prev env
2. Run watch gp ports list and watch gp tasks list notice how the output does not display any invalid character and the output is readable (and not colorized).

Release Notes

NONE

Documentation

We should document this flag/feature: https://github.com/gitpod-io/website/issues/2235

[filiptronicek]

Thanks a lot for taking this, @andreafalzetti!

I tested it and it's working just as advertised, but I have one question: could we abstract the logic for all of the gp commands so that for future commands we could just wrap the CLI in some function that would add the no-color options? This would help with many commands failing if you provide them with --no-color, like gp ports, which I think it would be better if it just ignored (if there was no color to display in the first place).

Holding the PR if you have any thoughts on this, feel free to unhold :)

/hold

[andreafalzetti]

Thanks a lot for taking this, @andreafalzetti!

I tested it and it's working just as advertised, but I have one question: could we abstract the logic for all of the gp commands so that for future commands we could just wrap the CLI in some function that would add the no-color options? This would help with many commands failing if you provide them with --no-color, like gp ports, which I think it would be better if it just ignored (if there was no color to display in the first place).

Holding the PR if you have any thoughts on this, feel free to unhold :)

/hold

Thanks, @filiptronicek for the review 🙏

We now have the util.ColorsEnabled which wraps all the logic to disable colors, the noColor flag variable has global scope, so it's accessible from all commands - if they need to have it. I thought about having a global --no-color flag for all commands, but for those which don't use colors, it would be confusing why it's there, so I've opted for having the 1-line copy/paste flag on each command that uses colors.

At the moment that's the best I can think of!

If anyone has any idea for further improvements, I am all ears :)

/unhold