Add the -no-gui option.

Options.cs

@@ -37,8 +37,9 @@ namespace XSDDiagram
         public static string Username { get; private set; }
         public static string Password { get; private set; }
         public static IList<string> TextOutputFields { get; private set; }
+        public static bool NoGUI { get; private set; }
 
-		static Options()
+        static Options()
 		{
 			InputFile = null;
 			OutputFile = null;
@@ -51,6 +52,7 @@ namespace XSDDiagram
 			ForceHugeImageGeneration = false;
 			RequestHelp = false;
             TextOutputFields = new List<string>();
+            NoGUI = false;
 
             IsRunningOnMono = Type.GetType("Mono.Runtime") != null;
 
@@ -155,6 +157,10 @@ namespace XSDDiagram
                             TextOutputFields.Add(field.Trim());
                     }
                 }
+                else if (string.Compare("-no-gui", argument, true) == 0)
+                {
+                    NoGUI = true;
+                }
                 else
 					InputFile = argument;
 			}

Program.cs

@@ -66,7 +66,8 @@ Usage: {1} [-o output.svg] [-os EXTENSION] [-r RootElement[@namespace]]* [-e N]
 -p PASSWORD
 	specifies a password to authenticate when a xsd dependency
 	(import or include) is a secured url.
-
+-no-gui
+	prevents the graphical interface to be opened.
 
 Example 1:
 > XSDDiagramConsole.exe -o file.png -r TotoRoot -r TotoComplexType@http://mynamespace -e 3 -d -z 200 ./folder1/toto.xsd
@@ -103,7 +104,7 @@ Example 5:
             Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
 
 			bool streamToOutput = !string.IsNullOrEmpty(Options.OutputFile) || Options.OutputOnStdOut;
-			if (Options.RequestHelp || streamToOutput)
+			if (Options.NoGUI || Options.RequestHelp || streamToOutput)
             {
 				//if(!Options.IsRunningOnMono)
 				//{

ReadMe.txt

@@ -71,6 +71,8 @@ Options:
 -p PASSWORD
 	specifies a password to authenticate when a xsd dependency
 	(import or include) is a secured url.
+-no-gui
+	prevents the graphical interface to be opened.
 
 
 Example 1:
@@ -136,7 +138,8 @@ CHANGES:
 version 1.2alpha (2016-11-??)
 - Add infer XSD from XML menu.
 - Fix a null reference exception in the documentation (Thanks Mario M.).
-- Add the namespace in the command line option -r (Thanks Kevin)
+- Add the namespace in the command line option -r (Thanks Kevin).
+- Add the option --no-gui to prevent the UI to be shown (Thanks Kevin).
 
 version 1.1 (2016-07-08)
 - Fix SVG page size.