tree c4b0ea5e5d3c964d777f4988b0bdaa3387e91763
parent ae303ab94b5bbc25572282595b16de7ae9566e0b
author Peter Weinberger <pjw@google.com> 1736029861 -0500
committer Peter Weinberger <pjw@google.com> 1736442237 -0800

gopls: prepare for mod cache index

This CL adds the infrastructure for using the module cache index when
satisfying missing imports. There is no change in behavior as it invokes
the existing imports.Source.

There is a new option importsSource whose value can be "goimports" to keep
the old behavior, "gopls" to use (in a future CL) the module cache
index, and "off" (for use by cider) to avoid looking in the file
system at all.

The index is kept in memory. Periodically the code checks to see if it
needs to be updated.

Change-Id: I61e0b5e224a6c26d75932417b26ecb9f432b460f
Reviewed-on: https://go-review.googlesource.com/c/tools/+/640495
Reviewed-by: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>