Added command line tool frontend.

codechicken/lib/tool/module/JOptModule.java

@@ -0,0 +1,48 @@
+package codechicken.lib.tool.module;
+
+import codechicken.lib.tool.ToolMain;
+import joptsimple.OptionException;
+import joptsimple.OptionParser;
+import joptsimple.OptionSet;
+
+import java.io.IOException;
+
+public abstract class JOptModule implements ToolMain.Module
+{
+    OptionParser parser = new OptionParser();
+
+    @Override
+    public void main(String[] args) {
+        OptionSet options;
+        try
+        {
+            options = parser.parse(args);
+        }
+        catch(OptionException ex)
+        {
+            System.err.println(ex.getLocalizedMessage());
+            System.exit(-1);
+            return;
+        }
+
+        try
+        {
+            main(parser, options);
+        }
+        catch(Exception e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+
+    protected abstract void main(OptionParser parser, OptionSet options);
+
+    @Override
+    public void printHelp() {
+        try {
+            parser.printHelpOn(System.out);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}