adding the server side code to generate context menu

core/src/main/java/hudson/Functions.java

@@ -792,7 +792,8 @@ public class Functions {
      */
     public static String getIconFilePath(Action a) {
         String name = a.getIconFileName();
-        if(name.startsWith("/"))
+        if (name==null)     return null;
+        if (name.startsWith("/"))
             return name.substring(1);
         else
             return "images/24x24/"+name;

core/src/main/java/hudson/model/Actionable.java

@@ -23,11 +23,20 @@
  */
 package hudson.model;
 
+import hudson.model.queue.Tasks;
+import jenkins.model.ModelObjectWithContextMenu;
+import org.apache.commons.jelly.Script;
+import org.apache.commons.jelly.XMLOutput;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.StaplerResponse;
+import org.kohsuke.stapler.WebApp;
 import org.kohsuke.stapler.export.Exported;
 import org.kohsuke.stapler.export.ExportedBean;
+import org.kohsuke.stapler.jelly.JellyClassTearOff;
+import org.kohsuke.stapler.jelly.JellyFacet;
+import org.xml.sax.helpers.DefaultHandler;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Vector;
 import java.util.concurrent.CopyOnWriteArrayList;
@@ -38,7 +47,7 @@ import java.util.concurrent.CopyOnWriteArrayList;
  * @author Kohsuke Kawaguchi
  */
 @ExportedBean
-public abstract class Actionable extends AbstractModelObject {
+public abstract class Actionable extends AbstractModelObject implements ModelObjectWithContextMenu {
     /**
      * Actions contributed to this model object.
      *
@@ -119,4 +128,22 @@ public abstract class Actionable extends AbstractModelObject {
         }
         return null;
     }
+
+    public ContextMenu doContextMenu(StaplerRequest request, StaplerResponse response) throws Exception {
+        ContextMenu c = new ContextMenu();
+
+        WebApp webApp = WebApp.getCurrent();
+        Script s = webApp.getMetaClass(this).getTearOff(JellyClassTearOff.class).findScript("sidepanel");
+        if (s==null) {
+            // fallback
+            c.addAll(getActions());
+        } else {
+            JellyFacet facet = webApp.getFacet(JellyFacet.class);
+            request.setAttribute("taskTags",c);
+            request.setAttribute("mode","side-panel");
+            facet.scriptInvoker.invokeScript(request,response,s,this,new XMLOutput(new DefaultHandler()));
+        }
+
+        return c;
+    }
 }

core/src/main/java/jenkins/model/Jenkins.java

@@ -293,7 +293,7 @@ import java.util.regex.Pattern;
  * @author Kohsuke Kawaguchi
  */
 @ExportedBean
-public class Jenkins extends AbstractCIBase implements ModifiableItemGroup<TopLevelItem>, StaplerProxy, StaplerFallback, ViewGroup, AccessControlled, DescriptorByNameOwner {
+public class Jenkins extends AbstractCIBase implements ModifiableItemGroup<TopLevelItem>, StaplerProxy, StaplerFallback, ViewGroup, AccessControlled, DescriptorByNameOwner, ModelObjectWithContextMenu {
     private transient final Queue queue;
 
     /**
@@ -2894,6 +2894,10 @@ public class Jenkins extends AbstractCIBase implements ModifiableItemGroup<TopLe
         rsp.getWriter().println("GCed");
     }
 
+    public ContextMenu doContextMenu(StaplerRequest request, StaplerResponse response) {
+        return new ContextMenu().addAll(getActions());
+    }
+
     /**
      * Obtains the heap dump.
      */

core/src/main/java/jenkins/model/ModelObjectWithContextMenu.java

+package jenkins.model;
+
+import hudson.Functions;
+import hudson.model.Action;
+import hudson.model.ModelObject;
+import org.apache.commons.jelly.JellyException;
+import org.kohsuke.stapler.HttpResponse;
+import org.kohsuke.stapler.Stapler;
+import org.kohsuke.stapler.StaplerRequest;
+import org.kohsuke.stapler.StaplerResponse;
+import org.kohsuke.stapler.export.Exported;
+import org.kohsuke.stapler.export.ExportedBean;
+import org.kohsuke.stapler.export.Flavor;
+
+import javax.servlet.ServletException;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * {@link ModelObject} that has context menu in the breadcrumb
+ * 
+ * This is just a marker interface. It needs 
+ * @author Kohsuke Kawaguchi
+ */
+public interface ModelObjectWithContextMenu extends ModelObject {
+    public ContextMenu doContextMenu(StaplerRequest request, StaplerResponse response) throws Exception;
+    
+    @ExportedBean
+    public class ContextMenu implements HttpResponse {
+        @Exported(inline=true)
+        public final List<MenuItem> items = new ArrayList<MenuItem>();
+        
+        public void generateResponse(StaplerRequest req, StaplerResponse rsp, Object o) throws IOException, ServletException {
+            rsp.serveExposedBean(req,this,Flavor.JSON);
+        }
+        
+        public ContextMenu add(String url, String text) {
+            items.add(new MenuItem(url,text));
+            return this;
+        }
+
+        public ContextMenu addAll(Collection<? extends Action> actions) {
+            for (Action a : actions)
+                add(a);
+            return this;
+        }
+        
+        public ContextMenu add(Action a) {
+            StaplerRequest req = Stapler.getCurrentRequest();
+            String text = a.getDisplayName();
+            String icon = Functions.getIconFilePath(a);
+            String url =  Functions.getActionUrl(req.findAncestor(ModelObject.class).getUrl(),a);
+
+            return add(url,icon,text);
+        }
+        
+        public ContextMenu add(String url, String icon, String text) {
+            if (text != null && icon != null && url != null)
+                items.add(new MenuItem(url,"<img src='"+url+"'> "+text));
+            return this;
+        }
+    }
+
+    @ExportedBean
+    public class MenuItem {
+        @Exported
+        public String url;
+        @Exported
+        public String text;
+
+        public MenuItem(String url, String text) {
+            this.url = url;
+            this.text = text;
+        }
+    }
+}

core/src/main/resources/lib/layout/task.jelly

@@ -94,8 +94,12 @@ THE SOFTWARE.
       </j:when>
       <j:otherwise>
         <div class="task">
+          <j:set var="icon" value="${rootURL}${icon.startsWith('images/') ? h.resourcePath : ''}/${icon}"/>
+          ${taskTags!=null ? taskTags.add(href,icon,title) : null}
+          ${taskTags}
+
           <a href="${href}" onclick="${attrs.onclick}">
-            <img width="24" height="24" style="margin: 2px;" alt="" src="${rootURL}${icon.startsWith('images/') ? h.resourcePath : ''}/${icon}"/>
+            <img width="24" height="24" style="margin: 2px;" alt="" src="${icon}"/>
           </a>
           <st:nbsp />