gvt fetch for existing project

Makefile

.DEFAULT_GOAL := help

define filterstdlib
go list -f '{{ if not .Standard }}{{ .ImportPath }}{{ end }}'
endef

define getimports
go list -f '{{ join .Imports "\n" }}'
endef

.PHONY: fetch
fetch:  ##  Use gvt fetch to vendor dependencies
	@echo "+ $@"
	@$(call getimports) | xargs $(call filterstdlib) | xargs -L1 gvt fetch | tee /dev/stderr


.PHONY: help
help:
	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'