gofind is a comamnd that searches through Go source code by types.

gofind [-p] [-s] [-q] <pkg>.<name>[.<sel>] <pkg>...

% gofind encoding/json.Encoder.Encode $(go list golang.org/x/...)
handlers.go:145:        json.NewEncoder(w).Encode(resp)
socket.go:125:                  if err := enc.Encode(m); err != nil {

gofind searches through Go source code by given expression, using type information. It finds code entities with the type of given expression:

• Variable definitions/occurrences
• Struct fields (with )
• Methods (with )

go get -u github.com/motemen/gofind/cmd/gofind

• Find return types
• provide filename-only option like "grep -l"
• eg. "error" in universe scope
• print for each package?

motemen https://motemen.github.io/