[REQUEST] Renderable for solid bar

[ssbarnea]

One common UI element is the display of a percentage as a small column, often also using a semaphore color gradient.
Most of the time these columns are very narrow, 4-5 chars like.

Current example with rich:

Example of desired look (Gerrit review size )

Details

• User may want to render nothing when value is either min or max
• User may want to left or right alignment
• I am not sure if reuse of current progressbar may be possible for this special usecase, especially as this requires use of https://en.wikipedia.org/wiki/Block_Elements for drawing in a very small space.
• Computing color gradient may be tricky, so it may worth allowing user to implement in and only supporting a single color.

[willmcgugan]

You could use rich.bar which is what Progress uses internally. Although the line characters it uses give you a granularity of 1/2 a 'cell'.

It wouldn't be that hard to implement something like bar.Bar using the more granular block characters. Which is probably a nice addition to Rich. I'll tag this as an enhancement, but you might want to tackle it yourself if you need it sooner.

[ssbarnea]

I will try to look at bar, even 1/2 bars provide decent size estimate. 5 chars => 10% range which is quite precise IMHO.

[willmcgugan]

See the new Bar class in v9.0.0 https://rich.readthedocs.io/en/latest/reference/bar.html

Note that rich.bar.Bar was renamed to rich.progress_bar.ProgessBar in v9, and rich.bar.Bar is the new solid bar.