gvm_auto.sh

# Based on chruby's auto feature
# https://github.com/postmodern/chruby/blob/bfd78880fbbbf13635e1f97f83225c6a03ca6e89/share/chruby/auto.sh

function gvm_auto() {
	local dir="$PWD/" version

	until [[ -z "$dir" ]]; do
		dir="${dir%/*}"

		if { read -r version <"$dir/.go-version"; } 2>/dev/null || [[ -n "$version" ]]; then
			version="${version%%[[:space:]]}"

			if [[ "$version" == "$GVM_AUTO_VERSION" ]]; then return
			else
				GVM_AUTO_VERSION="$version"

        if echo "$version" | grep -q "@"; then
          local name="${version%@*}"
          local pkgset="${version#*@}"
          gvm use "$name" > /dev/null && \
            gvm pkgset use "$pkgset" > /dev/null
        else
          gvm use "$version" > /dev/null
        fi

				return $?
			fi
		fi
	done

	if [[ -n "$GVM_AUTO_VERSION" ]]; then
		unset GVM_AUTO_VERSION
	fi
}