x/tools/gopls: don't show analysis for std and 3rd-party packages

[ShoshinNikita]

Warning in /src/os/exec_unix.go:

Warning in github.com/gorilla/mux@v1.8.0/mux.go:

I think these warnings are not useful, but just distracting. It makes sense to run analyzers only for workspace packages

[findleyr]

I'm not sure there's a clear answer here, though I agree that in the example above I wouldn't want to see analysis for gorilla/mux.
Perhaps we should disable analysis for anything in the mod cache.

I think this becomes more clear-cut once multi-module workspaces are the norm. At that point we'll know which modules the user is intending to work on.

CC @stamblerre @heschi

[nezorflame]

Maybe make it optional through the gopls setting?

[findleyr]

Maybe make it optional through the gopls setting?

We can consider that, but we'd need evidence that two users, when working on the same exact workspace, might reasonably want different behavior. I.e., that such configuration is not just papering over gopls' inability to determine the user's intent with respect to a given package.

In the past we've used configuration when we can't just Do The Right Thing, resulting in configuration bloat and suboptimal behavior in the common zero-config case (I've been guilty of this).

In this case, my sense is that users only want to see lint errors when they're actionable. A lint error in a read-only module is not actionable.

[nezorflame]

True, but we also have:

• /vendor
• local replace

Both of these are usually RW, thus actionable (maybe not every time and not in the case of /vendor, but it's possible).

[findleyr]

Indeed, though I would argue we also shouldn't run analyzers for vendored packages.

To be more precise, though, we should differentiate between running an analyzer and showing the diagnostics. In some cases we may want to run analyzers on all dependencies in order to compute facts.

Perhaps the rule should be "only show analysis diagnostics for workspace packages and locally replaced packages".

[ShoshinNikita]

Should I change the title to x/tools/gopls: don't show the diagnostics for std and 3rd-party packages?

[findleyr]

If that would satisfy your original request, then yes :)

I've updated the title with a slight variation of that.