Add program argument handling

cmd/weblug/weblug.go

@@ -17,11 +17,32 @@ var hooks []Hook
 
 type Handler func(http.ResponseWriter, *http.Request)
 
+func usage() {
+	fmt.Println("weblug is a simple webhook receiver")
+	fmt.Printf("Usage: %s [OPTIONS] YAML1[,YAML2...]\n\n", os.Args[0])
+	fmt.Println("OPTIONS")
+	fmt.Println("  -h, --help                Print this help message")
+	fmt.Println()
+	fmt.Println("The program loads the given yaml files for webhook definitions")
+}
+
 func main() {
 	cf.SetDefaults()
-	if err := cf.LoadYAML(("../../weblug.yaml")); err != nil {
-		fmt.Fprintf(os.Stderr, "yaml error: %s\n", err)
-		os.Exit(1)
+	if len(os.Args) < 2 {
+		usage()
+	}
+	for _, arg := range os.Args[1:] {
+		if arg == "" {
+			continue
+		} else if arg == "-h" || arg == "--help" {
+			usage()
+			os.Exit(0)
+		} else {
+			if err := cf.LoadYAML((arg)); err != nil {
+				fmt.Fprintf(os.Stderr, "yaml error: %s\n", err)
+				os.Exit(1)
+			}
+		}
 	}
 
 	if len(cf.Hooks) == 0 {