Working version

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="lib" path="C:/Users/Ramon/Desktop/Coding/bukkit-1.7.9-R0.2.jar">
+		<attributes>
+			<attribute name="javadoc_location" value="http://jd.bukkit.org/apidocs/"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>RoleplayChat</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.source=1.8

plugin.yml

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+name: RoleplayChat
+main: nomarthehero.RoleplayChat
+version: 1.0
+commands:
+  roleplay:
+    description: Enable roleplay chat
+    usage: /roleplay
+    permission: roleplay.use
+    permission-message: Missing permission.
+  rp:
+    description: Enable roleplay chat
+    usage: /roleplay
+    permission: roleplay.use
+    permission-message: Missing permission.

src/nomarthehero/RoleplayChat.java

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+package nomarthehero;
+import java.util.ArrayList;
+import java.util.HashSet;
+
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.AsyncPlayerChatEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.plugin.java.JavaPlugin;
+
+
+public class RoleplayChat extends JavaPlugin implements Listener, CommandExecutor  {
+
+	//Every 5~10 min "Hey <player>, you know you're still talking in roleplay chat?" (async runnable)
+
+	private ArrayList<String> roleplayers = new ArrayList<String>();
+	private ArrayList<String> staff = new ArrayList<String>();
+
+
+	public void onEnable() {
+
+		getCommand("roleplay").setExecutor(this);
+		getCommand("rp").setExecutor(this);
+		getServer().getPluginManager().registerEvents(this, this);
+
+	}
+
+
+	@Override
+	public boolean onCommand(CommandSender sender, Command command,
+			String label, String[] args) {
+
+		if (command.getName().equalsIgnoreCase("roleplay") || command.getName().equalsIgnoreCase("rp")) {
+
+			Player player = (Player)sender;
+			String playerName = player.getName();
+
+			if (roleplayers.contains(playerName)) {
+
+				roleplayers.remove(playerName);
+				player.sendMessage(ChatColor.YELLOW + "Disabled roleplay chat!");
+
+			}	else {
+
+				roleplayers.add(playerName);
+				player.sendMessage(ChatColor.YELLOW + "Enabled roleplay chat!");
+				player.sendMessage(ChatColor.YELLOW + "Roleplayers will have a yellow chat, and their messages " + ChatColor.RED + "won't" + ChatColor.YELLOW + " be sent in global chat.");
+				player.sendMessage(ChatColor.YELLOW + "To disable it, type /roleplay again.");
+
+			}
+
+
+		}
+
+		return true;
+	}
+
+	@EventHandler
+	public void onChat(AsyncPlayerChatEvent e) {
+
+		Player player = e.getPlayer();
+
+		if (isRoleplayer(player)) {
+
+			String message = e.getMessage();
+			message = ChatColor.YELLOW + message;
+
+			e.setCancelled(true);
+
+			for (String playerName : roleplayers) {
+
+				Bukkit.getPlayer(playerName).sendMessage(ChatColor.YELLOW + "[RP] " + player.getDisplayName() + ChatColor.YELLOW + ": " + message);
+
+			}
+
+			for (String playerName : staff) {
+
+				if (!roleplayers.contains(playerName)) {
+
+					Bukkit.getPlayer(playerName).sendMessage(ChatColor.YELLOW + "[RP] " + player.getDisplayName() + ChatColor.YELLOW + ": " + message);
+
+				}			
+
+			}
+
+		}
+
+	}
+
+
+	@EventHandler
+	public void onJoin(PlayerJoinEvent e) {
+
+		Player player = e.getPlayer();
+
+		if (player.hasPermission("roleplay.staff")) {
+			staff.add(player.getName());
+		}
+
+	}
+
+	@EventHandler
+	public void onLeave(PlayerQuitEvent e) {
+
+		roleplayers.remove(e.getPlayer().getName());
+
+	}
+
+	private boolean isRoleplayer(Player player) {
+
+		if (roleplayers.contains(player.getName())) {
+
+			return true;
+
+		}
+
+		return false;
+
+	}
+
+
+
+}