support specifying a version of uv installed to the workspace

[DetachHead]

i use uv instead of pip, but this extension does not seem to work unless pip is installed:

2025-07-22 09:58:44.199 [info] Terminal is activated: c:\Users\user\project\.venv\Scripts\python.exe
2025-07-22 09:58:47.777 [info] Running: C:\Users\user\project\.venv\Scripts\python.exe -m pip list
2025-07-22 09:58:48.221 [info] python: C:\Users\user\project\.venv\Scripts\python.exe: No module named pip

2025-07-22 09:58:48.351 [error] Error refreshing packages Failed to run python -m pip list

this extension should detect if uv is installed and run uv pip list instead.

i noticed there's a setting called python-envs.defaultPackageManager but the only valid value seems to be "ms-python.python:pip"

[karthiknadig]

@DetachHead We do attempt to detect it by searching the PATH. If it is available on path then we use it. We don't explicitly differentiate pip and uv, because there is a uv extension in the works that is supposed to be more feature rich.

May be this is a case where it is somehow not detecting uv that is on PATH, or uv is added to path as a part of shell init script and we don't see it if not launched from a shell.

[DetachHead]

oh in that case it's probably because i don't have uv installed globally. instead it's installed locally to my project using pyprojectx

though it should still be in my path because i have the following in my .vscode/settings.json:

{
  "terminal.integrated.env.windows": {
    "PATH": "${env:PATH};${workspaceFolder}/.pyprojectx/main"
  },
}

which is where uv is installed to:

does the environments extension not use the terminal.integrated.env settings? if not, is there another way i can get this to work? because i prefer to avoid installing tools globally when they can instead be pinned per-project along with all the other dependencies.

[karthiknadig]

@DetachHead we avoid launching terminals to find things. But since this is in the workspace we should be able to search for it.

@eleanorjboyd we currently look for uv on PATH, but we don't search the current workspace for it. This would be a feature request to search in the current workspace for uv.

[eleanorjboyd]

close in favor of the feature request I created about this: #812