deal with null events being fired (a common way to just fire actions) and allow optional description and icon parameters to be specified

libraries/kotlin-swing/src/main/kotlin/kotlin/swing/Actions.kt

@@ -3,17 +3,25 @@ package kotlin.swing
 import java.awt.event.ActionEvent
 import javax.swing.AbstractAction
 import javax.swing.Action
+import javax.swing.Action.*
 import javax.swing.Icon
 
 /**
  * Helper method to create an action from a function
  */
-fun action(text: String, icon: Icon? = null, fn: (ActionEvent) -> Unit): Action {
-    return object: AbstractAction(text, icon) {
+fun action(text: String, description: String? = null, mnemonic: Int? = null, icon: Icon? = null, fn: (ActionEvent) -> Unit): Action {
+    val answer = object: AbstractAction(text, icon) {
         public override fun actionPerformed(e: ActionEvent?) {
-            if (e != null) {
-                (fn)(e)
+            val event: ActionEvent = if (e != null) {
+                e
+            } else {
+                // lets create a dummy event
+                ActionEvent(this, ActionEvent.ACTION_PERFORMED, text)
             }
+            (fn)(event)
         }
     }
+    if (description != null) answer.putValue(SHORT_DESCRIPTION, description)
+    if (mnemonic != null) answer.putValue(MNEMONIC_KEY, mnemonic)
+    return answer
 }