Merge pull request #203 from gastaldi/master

FORGE-206: Display a diff of available commands when starting forge after installing/removing a plugin

shell/src/main/java/org/jboss/forge/shell/plugins/builtin/PluginDiffObserver.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2012 Red Hat, Inc. and/or its affiliates.
+ *
+ * Licensed under the Eclipse Public License version 1.0, available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ */
+
+package org.jboss.forge.shell.plugins.builtin;
+
+import java.util.Set;
+import java.util.TreeSet;
+
+import javax.enterprise.event.Observes;
+
+import org.jboss.forge.shell.Shell;
+import org.jboss.forge.shell.ShellColor;
+import org.jboss.forge.shell.command.PluginRegistry;
+import org.jboss.forge.shell.events.PostStartup;
+import org.jboss.forge.shell.events.ReinitializeEnvironment;
+
+/**
+ * Display a diff of available commands when starting forge after installing/removing a plugin
+ *
+ * @author <a href="mailto:ggastald@redhat.com">George Gastaldi</a>
+ *
+ */
+public class PluginDiffObserver
+{
+
+   private static volatile Set<String> LAST_PLUGINS_DIFF;
+
+   /**
+    * Called when Forge is restarted
+    */
+   public void onRestart(@Observes ReinitializeEnvironment restart, PluginRegistry pluginRegistry)
+   {
+      LAST_PLUGINS_DIFF = new TreeSet<String>();
+      LAST_PLUGINS_DIFF.addAll(pluginRegistry.getPlugins().keySet());
+   }
+
+   /**
+    * Called when Forge is booted up
+    */
+   public void onInitialize(@Observes PostStartup start, PluginRegistry pluginRegistry, Shell shell)
+   {
+      if (LAST_PLUGINS_DIFF != null)
+      {
+         Set<String> loadedPlugins = pluginRegistry.getPlugins().keySet();
+         Set<String> currentPlugins = new TreeSet<String>();
+         currentPlugins.addAll(loadedPlugins);
+         currentPlugins.removeAll(LAST_PLUGINS_DIFF);
+         if (!LAST_PLUGINS_DIFF.isEmpty() && !currentPlugins.isEmpty())
+         {
+            shell.print("The following plugins have been activated: ");
+            shell.println(ShellColor.BOLD, currentPlugins.toString());
+         }
+         LAST_PLUGINS_DIFF.removeAll(loadedPlugins);
+         if (!LAST_PLUGINS_DIFF.isEmpty())
+         {
+            shell.print("The following plugins have been deactivated: ");
+            shell.println(ShellColor.BOLD, LAST_PLUGINS_DIFF.toString());
+         }
+         LAST_PLUGINS_DIFF = null;
+      }
+
+   }
+
+}

shell/src/test/java/org/jboss/forge/shell/plugins/builtin/PluginDiffObserverTest.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2012 Red Hat, Inc. and/or its affiliates.
+ *
+ * Licensed under the Eclipse Public License version 1.0, available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ */
+
+package org.jboss.forge.shell.plugins.builtin;
+
+import static org.junit.Assert.*;
+
+import org.jboss.forge.test.AbstractShellTest;
+import org.junit.Ignore;
+import org.junit.Test;
+
+/**
+ * Test case for the {@link PluginDiffObserver} class
+ *
+ * @author <a href="mailto:ggastald@redhat.com">George Gastaldi</a>
+ *
+ */
+public class PluginDiffObserverTest extends AbstractShellTest
+{
+
+   @Test
+   @Ignore
+   public void test()
+   {
+      fail("Not yet implemented");
+   }
+
+}