Add support for coverage markup

[newhook]

I've been using gocov and gocov-html (https://github.com/matm/gocov-html) to generate coverage diagrams for my tests. It would be awesome if it was possible to get these integrated into vscode-go.

[tecbot]

Did you try out https://github.com/joefitzgerald/go-plus for atom? I really like the integrated highlighting of code coverage inside the editor, so you don't need to switch to something else to check the code coverage :).
But don't now if it's possible to change the background color of some code positions in vscode.

[newhook]

I think it could use the diagnostics to do this. For example, DiagnosticSeverity.Information, or Hint.

[egamma]

@tecbot look into the support for decorators in the VS Code API. Here is an example https://github.com/Microsoft/vscode-extension-samples/tree/master/decorator-sample

[newhook]

That's a 404.

[lukehoban]

@egamma Look's like the vscode-extension-samples is still private - not sure if that is intentional or not?

@tecbot See setDecorations for part of the API for working with decorations. There's also an extension doing some code coverage rendering here: https://github.com/bmeck/vscode-code-cover/blob/master/lib/ui.js

[egamma]

Fixed the vscode-extension-samples is now public.

[tecbot]

Thanks for your hints! Really helpful :)

[tampajohn]

@tecbot I've taken a stab at adding coverage highlighting in #143, trying to keep it close to what we're used to in Atom (only highlights current package files for example). Also added a "get test coverage in this package" command...

[lukehoban]

Looks like this issue didn't get closed after #143 was merged. I believe everything that was part of the ask here is available now.