Makefile for gvm + $GOPATH + git checkout

Makefile

.ONESHELL:

REPO_DIR="${PWD}"

define my_git_checkout
	(git checkout $(1) || git checkout --track origin/$(1)) && git pull
endef

define GVM_USE
	echo "========================================================================================="
	echo "[INFO] Recommended Go Version: 1.9"
	source "${GVM_ROOT}/scripts/gvm"
	gvm use go1.9
	# GOPATH should have already become ~/.gvm/pkgsets/go1.9/global
	cd "${GOPATH}/src/github.com/foo/bar/" && $(call my_git_checkout, "master")
	cd "${GOPATH}/src/github.com/foo/bar2/" && $(call my_git_checkout, "master")
	cd "${REPO_DIR}"
	echo "========================================================================================="
endef