Add Makefile and Dockerfile for builds of utility tool (#15)

This change adds a Makefile and a Dockerfile for builds of the go-dicom dicomutil utility tool and for testing the package in general.

.travis.yml

@@ -2,5 +2,5 @@ language: go
 go:
  - 1.9.x
 script:
- - go test -v ./...
- - go build ./...
+ - go get github.com/golang/dep/cmd/dep
+ - make

Dockerfile

@@ -0,0 +1,6 @@
+FROM golang:alpine
+WORKDIR /go/src/github.com/gradienthealth/go-dicom
+COPY . .
+RUN apk add --no-cache make git
+RUN go get github.com/golang/dep/cmd/dep
+RUN make

Makefile

@@ -0,0 +1,24 @@
+BINARY = dicomutil
+
+.PHONY: build
+build:
+ dep ensure
+ $(MAKE) test
+ go build -o build/${BINARY} ./dicomutil
+
+.PHONY: test
+test:
+ go test ./...
+
+.PHONY: run
+run:
+ make build
+ ./${BINARY}
+
+.PHONY: release
+release:
+ dep ensure
+ $(MAKE) test
+ GOOS=linux GOARCH=amd64 go build -o build/${BINARY}-linux-amd64 ./dicomutil;
+ GOOS=darwin GOARCH=amd64 go build -o build/${BINARY}-darwin-amd64 ./dicomutil;
+ GOOS=windows GOARCH=amd64 go build -o build/${BINARY}-windows-amd64.exe ./dicomutil;

dicomutil/dicomutil.go

@@ -25,9 +25,16 @@ var (
 )
 
 func main() {
+ // Update usage docs
+ flag.Usage = func() {
+ fmt.Fprintf(os.Stderr, "Usage of %s:\n%s <dicom file> [flags]\n", os.Args[0], os.Args[0])
+ flag.PrintDefaults()
+ }
+
  flag.Parse()
  if len(flag.Args()) == 0 {
- log.Panic("dicomutil <dicomfile>")
+ flag.Usage()
+ os.Exit(1)
  }
  if *verbose {
  dicomlog.SetLevel(math.MaxInt32)