Add coverage and code quality badges.

Makefile

@@ -1,7 +1,8 @@
 
-GO_SRC := $(shell find . -type f -name "*.go")
+GO_SRC := $(shell find -type f -name '*.go' ! -path '*/vendor/*')
 
 CONTAINER_NAME ?= wrouesnel/postgres_exporter:latest
+VERSION ?= $(shell git describe --dirty)
 
 all: vet test postgres_exporter
 
@@ -10,24 +11,32 @@ cross: docker-build docker
 
 # Simple go build
 postgres_exporter: $(GO_SRC)
-	CGO_ENABLED=0 go build -a -ldflags "-extldflags '-static' -X main.Version=$(shell git describe --dirty)" -o postgres_exporter .
+	CGO_ENABLED=0 go build -a -ldflags "-extldflags '-static' -X main.Version=$(VERSION)" -o postgres_exporter .
 
 postgres_exporter_integration_test: $(GO_SRC)
 	CGO_ENABLED=0 go test -c -tags integration \
-	    -a -ldflags "-extldflags '-static' -X main.Version=git:$(shell git describe --dirty)" -o postgres_exporter_integration_test .
+	    -a -ldflags "-extldflags '-static' -X main.Version=$(VERSION)" -o postgres_exporter_integration_test -cover -covermode count .
 
 # Take a go build and turn it into a minimal container
 docker: postgres_exporter
 	docker build -t $(CONTAINER_NAME) .
 
 vet:
-	go vet .
+	go vet
+
+# Check code conforms to go fmt
+style:
+	! gofmt -s -l $(GO_SRC) 2>&1 | read 2>/dev/null
+
+# Format the code
+fmt:
+	gofmt -s -w $(GO_SRC)
 
 test:
-	go test -v -cover .
+	go test -v -covermode count -coverprofile=cover.test.out
 
 test-integration: postgres_exporter postgres_exporter_integration_test
-	tests/test-smoke ./postgres_exporter ./postgres_exporter_integration_test
+	tests/test-smoke "$(shell pwd)/postgres_exporter" "$(shell pwd)/postgres_exporter_integration_test_script $(shell pwd)/postgres_exporter_integration_test $(shell pwd)/cover.integration.out"
 
 # Do a self-contained docker build - we pull the official upstream container
 # and do a self-contained build.