Add a new option to set a prefix for generated files in CLI.

src/CLI/CLI.cs

@@ -32,6 +32,7 @@ namespace CppSharp
             optionSet.Add("g=|gen=|generator=", "the {TYPE} of generated code: 'csharp' or 'cli' ('cli' supported only for Windows)", g => { GetGeneratorKind(g, errorMessages); } );
             optionSet.Add("p=|platform=", "the {PLATFORM} that the generated code will target: 'win', 'osx' or 'linux'", p => { GetDestinationPlatform(p, errorMessages); } );
             optionSet.Add("a=|arch=", "the {ARCHITECTURE} that the generated code will target: 'x86' or 'x64'", a => { GetDestinationArchitecture(a, errorMessages); } );
+            optionSet.Add("prefix=", "sets a string prefix to the names of generated files", a => { options.Prefix = a; });
 
             optionSet.Add("exceptions", "enables support for C++ exceptions in the parser", v => { options.EnableExceptions = true; });
             optionSet.Add("rtti", "enables support for C++ RTTI in the parser", v => { options.EnableRTTI = true; });

src/CLI/Generator.cs

@@ -187,6 +187,10 @@ namespace CppSharp
             driverOptions.OutputDir = options.OutputDir;
             driverOptions.CheckSymbols = options.CheckSymbols;
             driverOptions.Verbose = options.Verbose;
+
+            if (!string.IsNullOrEmpty(options.Prefix))
+                driverOptions.GenerateName = name =>
+                    options.Prefix + name.FileNameWithoutExtension;
         }
 
         private void SetupLinuxOptions(ParserOptions parserOptions)

src/CLI/Options.cs

@@ -30,6 +30,8 @@ namespace CppSharp
         public string OutputFileName { get; set; }
 
         public string InputLibraryName { get; set; }
+
+        public string Prefix { get; set; }
         
         public TargetPlatform? Platform { get; set; }