import ij.IJ;
import ij.Menus;

import ij.plugin.PlugIn;

import ij.gui.GenericDialog;

import java.util.Hashtable;
import java.util.Collections;
import java.util.ArrayList;
import java.util.Iterator;

import java.awt.TextField;
import java.awt.event.TextListener;
import java.awt.event.TextEvent;
import java.awt.Color;
 
keys = new ArrayList();
keys.addAll(Menus.getCommands().keySet());
Collections.sort(keys);
 
// gui
GenericDialog gd = new GenericDialog("Launcher");
gd.addStringField("Command: ", "");
final TextField prompt = (TextField)gd.getStringFields().get(0);
prompt.setForeground(Color.red);

prompt.addTextListener(new TextListener() {
	public void textValueChanged(TextEvent e) {
		String text = prompt.getText();
		// if a command matches, redo color to black
		for (Iterator it = keys.iterator(); it.hasNext(); ) {
			String command = (String)it.next();
			if (command.equals(text)) {
				prompt.setForeground(Color.black);
				return;
			}
		}
		// no command found, set to red:
		prompt.setForeground(Color.red);
	}
});

gd.showDialog();
if (gd.wasCanceled()) return;

String command = gd.getNextString();

// execute!
IJ.doCommand(command);