use "rich" for terminal rendering

[dlax]

I'm thinking of replacing blessed with rich as a terminal rendering library. Rich is now mature and provides high level features that would be nice for us as we could drop a bunch of custom logic on our side. In particular:

• no more need to handle available vertical space to limit the number of processes rendered (the limit() decorator)
• automatic cropping or wrapping of long lines
• better handling of text split with terminal sequence (would allow to handle horizontal scrolling as suggested in scrolling and wrapping #260 without loosing the formatting, or introducing a bunch of custom logic on our side)
• native table rendering
• "layouts" allowing to split the screen into multiple areas (possibly with fixed size, and automatic overflow handling)
• live display, allowing to refresh only part of the ui

That would be a large refactoring. But, after having played a bit with it, I think it's worth as it will make UI development easier long term.

Thoughts?

[blogh]

That looks like a great idea. :)

[blogh]

It would be nice, if we could solve #222 during the revamp. (I noticed that if there is wrapping only the first line is colored).

[dlax]

One thing I'm not sure we can easily replace is the overlay confirmation dialog when the user requests process cancel or kill. It's possible to emit a confirmation message, similar to input(), with rich; but it's less fancy than the current widget.

[blogh]

The fact that the size of the columns is potentially changing at each refresh is a little distracting.
What do you think about this ?

[dlax]

The fact that the size of the columns is potentially changing at each refresh is a little distracting. What do you think about this ?

I agree. Either we can fix the size of columns. Or we could also just hide the table when there's no row to show. Needs more thinking in any case.