added cli option '-h | --help'

help/help.go

@@ -0,0 +1,17 @@
+package help
+
+import (
+	"fmt"
+)
+
+// exported function(s)
+func Print() {
+	fmt.Println("usage:")
+	fmt.Println("\tgosync [source] [target] (options)")
+	fmt.Println("")
+	fmt.Println("options:")
+	fmt.Println("\t-u | --user:\t\tset user for ssh / rsync")
+	fmt.Println("\t-p | --password:\tset password for ssh / rsync")
+	fmt.Println("\t-c | --concurrency:\tset limit for concurrent rsync processes")
+	fmt.Println("\t-v | --verbose:\t\tenable verbose / debug output")
+}

settings/arguments.go

@@ -5,18 +5,21 @@ import (
 	"runtime"
 	"strconv"
 	"strings"
+	"velvettear/gosync/help"
 	"velvettear/gosync/log"
 )
 
 // exported function(s)
 func Initialize() {
 	os.Args = os.Args[1:]
-	if len(os.Args) < 2 {
-		log.Fatal("error: missing arguments")
-	}
 	var arguments []string
 	for index, arg := range os.Args {
 		switch strings.ToLower(arg) {
+		case "-h":
+			fallthrough
+		case "--help":
+			help.Print()
+			os.Exit(0)
 		case "-v":
 			fallthrough
 		case "--verbose":
@@ -56,6 +59,9 @@ func Initialize() {
 			arguments = append(arguments, arg)
 		}
 	}
+	if len(os.Args) < 2 {
+		log.Fatal("error: missing arguments")
+	}
 	setSource(arguments[0])
 	setTarget(arguments[1])
 	if Concurrency == 0 {