improve coverage calculation

.github/workflows/codecov.yml

@@ -1,6 +1,6 @@
 name: Test and coverage
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
@@ -13,6 +13,11 @@ jobs:
         with:
           go-version: '1.18'
       - name: Run coverage
-        run: go test ./... -race -coverprofile=coverage.txt -covermode=atomic -coverpkg github.com/muir/xop-go
+        run: make calculate_coverage
+
       - name: Upload coverage to Codecov
-        run: bash <(curl -s https://codecov.io/bash)
+        uses: codecov/codecov-action@v2
+        with:
+          verbose: true
+          flags: go_tests
+          fail_ci_if_error: true

Makefile

@@ -34,3 +34,21 @@ ${GOBIN}/enumer:;
 	-chmod -w $@
 	-rm $@.tmp
 
+calculate_coverage:
+	echo "mode: atomic" > coverage.txt
+	for d in $$(go list ./...); do \
+	  go test -race -covermode=atomic -coverprofile=profile.out -coverpkg=github.com/muir/xop-go/... $$d; \
+	  if [ -f profile.out ]; then \
+	    grep -v ^mode profile.out >> coverage.txt; \
+	    rm profile.out; \
+	  fi; \
+	done
+
+
+coverage: calculate_coverage
+	go tool cover -html=coverage.txt
+
+golanglint:
+	# binary will be $(go env GOPATH)/bin/golangci-lint
+	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $$(go env GOPATH)/bin v1.45.2
+	golangci-lint --version