Make our commands support tab-complete.

src/main/java/com/gmail/nossr50/commands/ToggleCommand.java

@@ -0,0 +1,84 @@
+package com.gmail.nossr50.commands;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabExecutor;
+import org.bukkit.entity.Player;
+import org.bukkit.util.StringUtil;
+
+import com.gmail.nossr50.datatypes.player.McMMOPlayer;
+import com.gmail.nossr50.util.commands.CommandUtils;
+import com.gmail.nossr50.util.player.UserManager;
+
+import com.google.common.collect.ImmutableList;
+
+public abstract class ToggleCommand implements TabExecutor {
+    protected McMMOPlayer mcMMOPlayer;
+    protected Player player;
+
+    @Override
+    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+        switch (args.length) {
+            case 0:
+                if (CommandUtils.noConsoleUsage(sender)) {
+                    return true;
+                }
+
+                if (!hasSelfPermission(sender)) {
+                    sender.sendMessage(command.getPermissionMessage());
+                    return true;
+                }
+
+                mcMMOPlayer = UserManager.getPlayer(sender.getName());
+                player = mcMMOPlayer.getPlayer();
+
+                applyCommandAction();
+                return true;
+
+            case 1:
+                if (!hasOtherPermission(sender)) {
+                    sender.sendMessage(command.getPermissionMessage());
+                    return true;
+                }
+
+                mcMMOPlayer = UserManager.getPlayer(args[0]);
+
+                if (!CommandUtils.checkPlayerExistence(sender, args[0], mcMMOPlayer)) {
+                    return true;
+                }
+
+                player = mcMMOPlayer.getPlayer();
+
+                if (CommandUtils.isOffline(sender, player)) {
+                    return true;
+                }
+
+                applyCommandAction();
+                sendSuccessMessage(sender);
+                return true;
+
+            default:
+                return false;
+        }
+    }
+
+    @Override
+    public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+        switch (args.length) {
+            case 1:
+                Set<String> playerNames = UserManager.getPlayers().keySet();
+                return StringUtil.copyPartialMatches(args[0], playerNames, new ArrayList<String>(playerNames.size()));
+            default:
+                return ImmutableList.of();
+        }
+    }
+
+    protected abstract boolean hasOtherPermission(CommandSender sender);
+    protected abstract boolean hasSelfPermission(CommandSender sender);
+    protected abstract void applyCommandAction();
+    protected abstract void sendSuccessMessage(CommandSender sender);
+}