feat: change sort col using two fixed keys

[mlosicki]

My attempt at this feature request: #1000

Description

Change the sort col using two fixed keys, < and >. q changes the sort order. The behaviour is now similar to top

Demo

(The player doesn't show the key inputs sadly)

Implementation details

• Used the q key instead of r because it is already used in some places (e.g. node drain). I assumed you do not want to change the default keybindings even though I am personally in favour of refactoring with r
• I believe the sort implementation could benefit from a refactor. Currently, the values are sorted on the displayed string value. I took the inspiration from age to fix sorting on capacity, but it isn't ideal. It can lead to issues like this too: #885. The original value or a specific compare function should be kept on the level of the Fields or even Row.
• Not a Go dev, sorry upfront for non-idiomatic code

Closes #1000

[chauncey-garrett]

This is a great improvement! Here's to hoping it can get merged.

[olee]

What's the status of this? Any reason it couldn't be merged? In my case I'd love to order by assigned memory limit (not the percentage) which is not possible atm.

[ventsislav-georgiev]

Rebased with small fixes here: https://github.com/derailed/k9s/pull/2739

[uozalp]

@derailed This PR dates back to 2021 and k9s now supports asc/desc column sorting, the feature is largely covered. Due to current sorting limitations, it might still be worth revisiting this approach in the future.