Report coverage to coveralls.io. Trigger from Travis. (#134)

Author: jkohen

.coveralls.yml

@@ -0,0 +1 @@
+service_name: travis-pro

.travis.yml

@@ -1 +1,6 @@
 language: go
+script: make goveralls
+# Contains tokens for Coveralls. See https://docs.coveralls.io/go
+env:
+  global:
+    secure: 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

Makefile

@@ -16,6 +16,7 @@ GOFMT        ?= $(GO)fmt
 FIRST_GOPATH := $(firstword $(subst :, ,$(shell $(GO) env GOPATH)))
 PROMU        := $(FIRST_GOPATH)/bin/promu
 STATICCHECK  := $(FIRST_GOPATH)/bin/staticcheck
+GOVERALLS    := $(FIRST_GOPATH)/bin/goveralls
 pkgs          = $(shell $(GO) list ./... | grep -v /vendor/)
 
 PREFIX                  ?= $(shell pwd)
@@ -63,6 +64,13 @@ staticcheck: $(STATICCHECK)
 	@echo ">> running staticcheck"
 	@$(STATICCHECK) $(pkgs)
 
+goveralls: cover $(GOVERALLS)
+ifndef COVERALLS_TOKEN
+	$(error COVERALLS_TOKEN is undefined, follow https://docs.coveralls.io/go to create one and go to https://coveralls.io to retrieve existing ones)
+endif
+	@echo ">> running goveralls"
+	@$(GOVERALLS) -coverprofile=coverage.out -service=travis-ci -repotoken "${COVERALLS_TOKEN}"
+
 build: promu
 	@echo ">> building binaries"
 	@$(PROMU) build --prefix $(PREFIX)
@@ -99,4 +107,7 @@ promu:
 $(FIRST_GOPATH)/bin/staticcheck:
 	@GOOS= GOARCH= $(GO) get -u honnef.co/go/tools/cmd/staticcheck
 
-.PHONY: all style check_license format build test vet assets tarball docker promu staticcheck $(FIRST_GOPATH)/bin/staticcheck
+$(FIRST_GOPATH)/bin/goveralls:
+	@GOOS= GOARCH= $(GO) get -u github.com/mattn/goveralls
+
+.PHONY: all style check_license format build test vet assets tarball docker promu staticcheck $(FIRST_GOPATH)/bin/staticcheck goveralls $(FIRST_GOPATH)/bin/goveralls