add redirect_logging as a core feature

src/main/java/net/aufdemrand/denizencore/DenizenCore.java

@@ -5,6 +5,7 @@
 import net.aufdemrand.denizencore.scripts.ScriptHelper;
 import net.aufdemrand.denizencore.scripts.commands.CommandRegistry;
 import net.aufdemrand.denizencore.scripts.queues.ScriptEngine;
+import net.aufdemrand.denizencore.utilities.debugging.LogInterceptor;
 import net.aufdemrand.denizencore.utilities.debugging.dB;
 import net.aufdemrand.denizencore.utilities.scheduling.Schedulable;
 
@@ -36,6 +37,8 @@ public static ScriptEngine getScriptEngine() {
         return scriptEngine;
     }
 
+    public static LogInterceptor logInterceptor = new LogInterceptor();
+
     static {
         String version = "UNKNOWN";
         try {

src/main/java/net/aufdemrand/denizencore/DenizenImplementation.java

@@ -131,7 +131,11 @@ public interface DenizenImplementation {
 
     public abstract String getLastEntryFromFlag(String flag);
 
-    public TagContext getTagContext(ScriptEntry entry);
+    public abstract TagContext getTagContext(ScriptEntry entry);
 
-    public int getTagTimeout();
+    public abstract int getTagTimeout();
+
+    public abstract boolean allowConsoleRedirection();
+
+    public abstract String cleanseLogString(String str);
 }

src/main/java/net/aufdemrand/denizencore/scripts/commands/CommandRegistry.java

@@ -10,6 +10,7 @@
 import java.util.Map;
 
 public abstract class CommandRegistry implements dRegistry {
+
     public CommandRegistry() {
     }
 
@@ -19,7 +20,7 @@ public CommandRegistry() {
     @Override
     public boolean register(String commandName, RegistrationableInstance commandInstance) {
         this.instances.put(CoreUtilities.toLowerCase(commandName), (AbstractCommand) commandInstance);
-        this.classes.put(((AbstractCommand) commandInstance).getClass(), commandName.toUpperCase());
+        this.classes.put(((AbstractCommand) commandInstance).getClass(), CoreUtilities.toLowerCase(commandName));
         return true;
     }
 

src/main/java/net/aufdemrand/denizencore/tags/core/UtilTags.java

@@ -1,7 +1,9 @@
 package net.aufdemrand.denizencore.tags.core;
 
+import net.aufdemrand.denizencore.DenizenCore;
 import net.aufdemrand.denizencore.objects.Duration;
 import net.aufdemrand.denizencore.objects.Element;
+import net.aufdemrand.denizencore.objects.Mechanism;
 import net.aufdemrand.denizencore.objects.aH;
 import net.aufdemrand.denizencore.scripts.queues.ScriptQueue;
 import net.aufdemrand.denizencore.tags.Attribute;
@@ -301,4 +303,33 @@ else if (attribute.startsWith("format")
             }
         }
     }
+
+
+    public static void adjustSystem(Mechanism mechanism) {
+        Element value = mechanism.getValue();
+
+        // <--[mechanism]
+        // @object server
+        // @name redirect_logging
+        // @input Element(Boolean)
+        // @description
+        // Tells the server to redirect logging to a world event or not.
+        // Note that this redirects *all console output* not just Denizen output.
+        // Note: don't enable /denizen debug -e while this is active.
+        // @tags
+        // None
+        // -->
+        if (mechanism.matches("redirect_logging") && mechanism.hasValue()) {
+            if (!DenizenCore.getImplementation().allowConsoleRedirection()) {
+                dB.echoError("Console redirection disabled by administrator.");
+                return;
+            }
+            if (mechanism.getValue().asBoolean()) {
+                DenizenCore.logInterceptor.redirectOutput();
+            }
+            else {
+                DenizenCore.logInterceptor.standardOutput();
+            }
+        }
+    }
 }

src/main/java/net/aufdemrand/denizencore/utilities/debugging/LogInterceptor.java

@@ -0,0 +1,67 @@
+package net.aufdemrand.denizencore.utilities.debugging;
+
+import net.aufdemrand.denizencore.DenizenCore;
+import net.aufdemrand.denizencore.events.OldEventManager;
+import net.aufdemrand.denizencore.objects.Element;
+import net.aufdemrand.denizencore.objects.dObject;
+
+import java.io.PrintStream;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+
+/**
+ * Intercepts system.out operations for the sake of blocking messages at request.
+ * Disabled by default in config.yml
+ */
+public class LogInterceptor extends PrintStream {
+    boolean redirected = false;
+    public PrintStream standardOut;
+
+    public LogInterceptor() {
+        super(System.out, true);
+    }
+
+    // <--[event]
+    // @Events
+    // console output
+    //
+    // @Warning Disable debug on this event or you'll get an infinite loop!
+    //
+    // @Triggers when any message is printed to console. (Requires <@link mechanism system.redirect_logging> be set true.)
+    // @Context
+    // <context.message> returns the messsage that is being printed to console.
+    //
+    // @Determine
+    // "CANCELLED" to disable the output.
+    //
+    // -->
+    @Override
+    public void print(String s) {
+        HashMap<String, dObject> context = new HashMap<String, dObject>();
+        context.put("message", new Element(DenizenCore.getImplementation().cleanseLogString(s)));
+        List<String> Determinations = OldEventManager.doEvents(Arrays.asList("console output"), // TODO: ScriptEvent
+                DenizenCore.getImplementation().getEmptyScriptEntryData(), context);
+        for (String str : Determinations) {
+            if (str.equalsIgnoreCase("cancelled")) {
+                return;
+            }
+        }
+        super.print(s);
+    }
+
+    public void redirectOutput() {
+        if (redirected) {
+            return;
+        }
+        standardOut = System.out;
+        System.setOut(this);
+    }
+
+    public void standardOutput() {
+        if (!redirected) {
+            return;
+        }
+        System.setOut(standardOut);
+    }
+}