set and read CLI flags for filename & publish

config/cli.go

@@ -0,0 +1,36 @@
+package config
+
+import (
+	"flag"
+	"fmt"
+	"os"
+)
+
+var (
+	filename string
+)
+
+func ParseCli() (string, *bool) {
+	flag.StringVar(&filename, "filename", "", "path of config")
+	publish := flag.Bool("publish", false, "publish etcd messages")
+
+	flag.Parse()
+
+	args := os.Args[1:]
+	if len(args) == 0 {
+		// no command, exit with code 2 (invalid usage)
+	  fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
+
+    flag.PrintDefaults()
+		os.Exit(2)
+	}
+
+	if len(filename) < 1 {
+		fmt.Fprintf(os.Stderr, "Filename required. Usage:\n")
+
+		flag.PrintDefaults()
+		os.Exit(2)
+	}
+
+	return filename, publish
+}