add fmt check command (#18)

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

Makefile

@@ -6,10 +6,12 @@ EXECUTABLE := drone-jenkins
 # for dockerhub
 DEPLOY_ACCOUNT := appleboy
 DEPLOY_IMAGE := $(EXECUTABLE)
+GOFMT ?= gofmt "-s"
 
 TARGETS ?= linux darwin windows
 PACKAGES ?= $(shell go list ./... | grep -v /vendor/)
 SOURCES ?= $(shell find . -name "*.go" -type f)
+GOFILES := find . -name "*.go" -type f -not -path "./vendor/*"
 TAGS ?=
 LDFLAGS ?= -X 'main.Version=$(VERSION)'
 
@@ -28,8 +30,7 @@ endif
 all: build
 
 fmt:
-	find . -name "*.go" -type f -not -path "./vendor/*" | xargs gofmt -s -w
-
+	$(GOFILES) | xargs $(GOFMT) -w
 vet:
 	go vet $(PACKAGES)
 
@@ -51,7 +52,16 @@ unconvert:
 	fi
 	for PKG in $(PACKAGES); do unconvert -v $$PKG || exit 1; done;
 
-test:
+.PHONY: fmt-check
+fmt-check:
+	# get all go files and run go fmt on them
+	@files=$$($(GOFILES) | xargs $(GOFMT) -l); if [ -n "$$files" ]; then \
+		echo "Please run 'make fmt' and commit the result:"; \
+		echo "$${files}"; \
+		exit 1; \
+		fi;
+
+test: fmt-check
 	for PKG in $(PACKAGES); do go test -v -cover -coverprofile $$GOPATH/src/$$PKG/coverage.txt $$PKG || exit 1; done;
 
 html:

main.go

@@ -17,7 +17,7 @@ func main() {
 	app.Usage = "trigger jenkins jobs"
 	app.Copyright = "Copyright (c) 2017 Bo-Yi Wu"
 	app.Authors = []cli.Author{
-		cli.Author{
+		{
 			Name:  "Bo-Yi Wu",
 			Email: "appleboy.tw@gmail.com",
 		},