Merge pull request #47 from mstg/fix-2-gofmt

Output go fmt results to temp file and check if empty

hack/gofmt_check.sh

@@ -8,7 +8,9 @@ $BAZEL_B @go_sdk//...
 
 export PATH="$(bazel info output_base)/external/go_sdk/bin:$PATH"
 
-if [[ -z $(go fmt -n $(go list ./... | grep -v /vendor/) | sed 's/ -w//') ]]; then
+$(go fmt -n $(go list ./... | grep -v /vendor/) | sed 's/ -w//') > /tmp/fmt
+
+if [[ -n "$(cat /tmp/fmt)" ]]; then
   echo "Go files must be formatted with gofmt. Please run:"
   echo '  go fmt $(go list ./... | grep -v /vendor/)'
   exit 1