Show ephemeral progress bar in uv run and uv tool run

[charliermarsh]

When the environment isn't cached / readily available, I think these now show too little logging (for large environments, it feels like it's just hanging, when in reality it's preparing the environment). We should just show a spinner in those cases at least.

[zanieb]

I guess cargo run isn't quiet by default, maybe we should reconsider? We should definitely show if we need to build the root project.

[charliermarsh]

Yeah it's too quiet right now... Some ideas (not mutually exclusive):

• Show an ephemeral spinner (so, it disappears once complete) if we have to do any work? Unfortunately we might have to "always" show this for uv tool run because (if the tool isn't already-installed) we have to perform a resolution even if we end up using a cached environment.
• Show the "Building" and "Built" outputs always? Like the cyan and green ones that appear separately from the progress spinners.
• Show the "Installed X packages in Yms" output but not the full list of modifications?

[konstin]

Personally, i'd like uv run to be completely if everything is cached (i do cargo run -q often enough), show a spinner if something isn't and Building/Built/Installed X packages in Yms summary messages if something changes (but not the whole list of packages).

[charliermarsh]

I agree. The main problem there is that with uv tool run, we have to resolve in order to locate a cached environment 🤔