Improve module naming heuristics and add an option for setting it explicitly.

src/CLI/CLI.cs

@@ -24,6 +24,8 @@ namespace CppSharp
             optionSet.Add("o=|output=", "the {PATH} for the generated bindings file (doesn't need the extension since it will depend on the generator)", v => HandleOutputArg(v, errorMessages) );
             optionSet.Add("on=|outputnamespace=", "the {NAMESPACE} that will be used for the generated code", on => options.OutputNamespace = on );
 
+            optionSet.Add("m=|module=", "the name for the generated {MODULE}", a => { options.OutputFileName = a; });
+
             optionSet.Add("iln=|inputlibraryname=|inputlib=", "the {NAME} of the shared library that contains the symbols of the generated code", iln => options.InputLibraryName = iln );
             optionSet.Add("d|debug", "enables debug mode which generates more verbose code to aid debugging", v => options.Debug = true);
             optionSet.Add("c|compile", "enables automatic compilation of the generated code", v => options.Compile = true);

src/CLI/Generator.cs

@@ -86,8 +86,16 @@ namespace CppSharp
                 options.OutputDir = Path.Combine(Directory.GetCurrentDirectory(), "gen");
             }
 
-            var dir = Path.GetDirectoryName(options.HeaderFiles.First());
+            string moduleName;
-            var moduleName = new DirectoryInfo(dir).Name;
+            if (options.HeaderFiles.Count == 1)
+            {
+                moduleName = Path.GetFileNameWithoutExtension(options.HeaderFiles.First());
+            }
+            else
+            {
+                var dir = Path.GetDirectoryName(options.HeaderFiles.First());
+                moduleName = new DirectoryInfo(dir).Name;
+            }
 
             if (string.IsNullOrEmpty(options.OutputFileName))
                 options.OutputFileName = moduleName;