CLI: Allow running a single command non-interactively

Added the possibility to pass to cli.jar a command, which it runs instead
of taking commands interactively. Note that the initialization script is
run before the given command.

After this patch,

        scripts/run.py -e "java.so -jar /java/cli.jar"

Continues to run the interactive command line editor loop, as before.
But additionally, one can do:

        scripts/run.py -e "java.so -jar /java/cli.jar ls"

To run just the command "ls" and exit - exactly as if the user would type
this command on the command line and exit the VM.

The given command can be, of course, much longer. For example to run Jetty
after the CLI's normal initialization script, the following monster can
be used:

scripts/run.py -n -e "java.so -jar /java/cli.jar java -classpath /jetty/* org.eclipse.jetty.xml.XmlConfiguration /jetty/jetty.xml"

(Funny how a single command should say "java" 3 times and "jetty" 4 times :-))

console/cli.js

@@ -286,5 +286,10 @@ update_prompt();
 
 load("/console/init.js");
 
-// Main loop
-main_loop();
+mainargs = com.cloudius.cli.main.RhinoCLI._args;
+if (mainargs.length) {
+    invoke(mainargs);
+} else {
+    // Main loop
+    main_loop();
+}

java/cli/com/cloudius/cli/main/RhinoCLI.java

@@ -11,6 +11,8 @@ public class RhinoCLI {
 
     public static Scriptable _scope;
     public static Context _cx;
+    
+    public static String[] _args;
 
     //
     // Invoke the cli.js file take care of exposing all scriptable objects
@@ -23,6 +25,8 @@ public class RhinoCLI {
             global.init(_cx);
             _scope = ScriptableObject.getTopLevelScope(global);
             
+            _args = args;
+
             FileReader cli_js = new FileReader("/console/cli.js");
             _cx.evaluateReader(_scope, cli_js, "cli.js", 1, null);