Explore ways to indicate to user whether Python is not installed or is invalid

[karrtikr]

We need to let users know they need to select an interpreter, one way to let them know about this is if they use a feature manually. But seeing as manual triggers can be unnatural to run into and there aren't many, explore other ways.

[karrtikr]

Spike results:

• When utilizing problems window to indicate whether Python is not installed or is invalid and adding a quickfix to which leads to us opening the quickpick:

  

  VSCode doesn't seem to support workspace level diagnostics at the minute, vscode.Diagnostic always needs a file. When we create a diagnostic for the workspace folder uri, it does not behave very nicely:

  • Clicking the problem opens a file which does not exist.
  • Unable to add workspace level quick fixes for the problem as the file doesn't exist.

  If we choose any of the opened python file randomly to display it:

  

• When using status bar/language status items to indicate this situation:

Change the color of the status bar item to warning:

[karrtikr]

Verify the following warning appears in the status bar: