Added /wiki chat command.

src/main/java/com/dreammaster/command/WikiCommand.java

@@ -0,0 +1,120 @@
+package com.dreammaster.command;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.ArrayList;
+import java.util.List;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiConfirmOpenLink;
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.gui.GuiYesNoCallback;
+import net.minecraft.command.ICommand;
+import net.minecraft.command.ICommandSender;
+import net.minecraft.entity.player.EntityPlayerMP;
+
+public class WikiCommand implements ICommand {
+
+    private List aliases;
+
+    public WikiCommand() {
+        aliases = new ArrayList();
+        aliases.add("wiki");
+    }
+
+    @Override
+    public int compareTo(Object arg0) {
+        return 0;
+    }
+
+    @Override
+    public String getCommandName() {
+        return "wiki";
+    }
+
+    @Override
+    public String getCommandUsage(ICommandSender p_71518_1_) {
+        return "/wiki [<topic>|hand|block]";
+    }
+
+    @Override
+    public List getCommandAliases() {
+        return aliases;
+    }
+
+    // Main page, if no arguments are provided.
+    private static final URI URIMainPage;
+
+    static {
+        URI uri = null;
+        try {
+            uri = new URI("https://gtnh.miraheze.org/wiki/Main_Page");
+        } catch (URISyntaxException ignored) {}
+        URIMainPage = uri;
+    }
+
+    // Substring "@@@" to be replaced by search keyword(s).
+    private static final String URISearchPattern = "https://gtnh.miraheze.org/wiki/Special:Search?search=@@@&go=Search";
+
+    @Override
+    public void processCommand(ICommandSender pCmdSender, String[] pArgs) {
+        if (!(pCmdSender instanceof EntityPlayerMP)) return;
+
+        if (pArgs.length == 0) {
+            openURIRespectingSettings(URIMainPage);
+        } else {
+            URI uri;
+            try {
+                uri = new URI(URISearchPattern.replace("@@@", String.join("%20", pArgs)));
+            } catch (URISyntaxException ignore) {
+                return;
+            }
+            openURIRespectingSettings(uri);
+        }
+    }
+
+    private void openURIRespectingSettings(URI uri) {
+        if (uri == null) return;
+        if (Minecraft.getMinecraft().gameSettings.chatLinksPrompt) {
+            // Schedule task for the next tick. Otherwise, processing the command closes the window instantly.
+            Minecraft.getMinecraft().func_152344_a(() -> openURIConfirmationScreen(uri));
+        } else {
+            openURI(uri);
+        }
+    }
+
+    private void openURIConfirmationScreen(URI uri) {
+        GuiScreen oldScreen = Minecraft.getMinecraft().currentScreen;
+        Minecraft.getMinecraft().displayGuiScreen(new GuiConfirmOpenLink(new GuiYesNoCallback() {
+
+            @Override
+            public void confirmClicked(boolean result, int id) {
+                if (result) openURI(uri);
+                Minecraft.getMinecraft().displayGuiScreen(oldScreen);
+            }
+        }, uri.toString(), 0, false));
+    }
+
+    private void openURI(URI uri) {
+        try {
+            Class<?> oclass = Class.forName("java.awt.Desktop");
+            Object object = oclass.getMethod("getDesktop").invoke(null);
+            oclass.getMethod("browse", URI.class).invoke(object, uri);
+        } catch (Throwable ignore) {}
+    }
+
+    @Override
+    public boolean canCommandSenderUseCommand(ICommandSender pCommandSender) {
+        return true;
+    }
+
+    @Override
+    public List addTabCompletionOptions(ICommandSender p_71516_1_, String[] p_71516_2_) {
+        return null;
+    }
+
+    @Override
+    public boolean isUsernameIndex(String[] p_82358_1_, int p_82358_2_) {
+        return false;
+    }
+}

src/main/java/com/dreammaster/main/MainRegistry.java

@@ -41,6 +41,7 @@
 import com.dreammaster.command.CustomToolTipsCommand;
 import com.dreammaster.command.HazardousItemsCommand;
 import com.dreammaster.command.ItemInHandInfoCommand;
+import com.dreammaster.command.WikiCommand;
 import com.dreammaster.config.CoreModConfig;
 import com.dreammaster.creativetab.ModTabList;
 import com.dreammaster.detrav.ScannerTools;
@@ -559,5 +560,6 @@ public void serverLoad(FMLServerStartingEvent pEvent) {
         if (YAMCore.isDebug()) {
             pEvent.registerServerCommand(new AllPurposeDebugCommand());
         }
+        pEvent.registerServerCommand(new WikiCommand());
     }
 }