[tools] gopls/mod: find references to required modules

[Peter Weinberger (Gerrit)]

Peter Weinberger submitted the change

Change information

Commit message:

gopls/mod: find references to required modules

With this CL, users will be able to click on a required module in a
go.mod file, and see the import statements that reference its
packages.

In addition to integrating with LSP clients, this code avoids
reporting imports of nested modules.

Testing: there are marker tests, but self-contained. A lot
of natural uses will be to find modules from the module cache.
I tested by hand getting references from a go.mod file in
the tools repository. For instance, when searching for references to
golang/x/tools in gopls/go.mod, for marker_test.go it finds
the 8 imports of packages in golang.org/x/tools,
but none of the many golang.go/x/tools/gopls imports.

Fixes golang/go#75810

Change-Id: I08022dd29173a6d4ea8c728c7eb8e54a462a5889

Reviewed-on: https://go-review.googlesource.com/c/tools/+/713160

Reviewed-by: Alan Donovan <adon...@google.com>

LUCI-TryBot-Result: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Files:

• M gopls/doc/features/navigation.md
• M gopls/doc/release/v0.22.0.md
• M gopls/internal/cache/mod.go
• A gopls/internal/mod/references.go
• M gopls/internal/server/references.go
• A gopls/internal/test/marker/testdata/references/issue75810.txt
• A gopls/internal/test/marker/testdata/references/issue75810A.txt

Change size: L

Delta: 7 files changed, 275 insertions(+), 1 deletion(-)

Branch: refs/heads/master

Submit Requirements:

• Code-Review: +2 by Alan Donovan
• TryBots-Pass: LUCI-TryBot-Result+1 by Go LUCI

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Gerrit

Gerrit-MessageType: merged

Gerrit-Project: tools

Gerrit-Branch: master

Gerrit-Change-Id: I08022dd29173a6d4ea8c728c7eb8e54a462a5889

Gerrit-Change-Number: 713160

Gerrit-PatchSet: 29

Gerrit-Owner: Peter Weinberger <p...@google.com>

Gerrit-Reviewer: Alan Donovan <adon...@google.com>

Gerrit-Reviewer: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Gerrit-Reviewer: Peter Weinberger <p...@google.com>

Gerrit-Reviewer: antonio vereecken <antoniov...@gmail.com>

Gerrit-CC: Robert Findley <rfin...@golang.org>