Adds a tab completer for the list command

src/main/java/net/knarcraft/paidsigns/PaidSigns.java

@@ -5,6 +5,7 @@ import net.knarcraft.paidsigns.command.AddConditionCommand;
 import net.knarcraft.paidsigns.command.AddConditionTabCompleter;
 import net.knarcraft.paidsigns.command.AddTabCompleter;
 import net.knarcraft.paidsigns.command.ListCommand;
+import net.knarcraft.paidsigns.command.ListTabCompleter;
 import net.knarcraft.paidsigns.command.ReloadTabCommand;
 import net.knarcraft.paidsigns.command.RemoveConditionCommand;
 import net.knarcraft.paidsigns.command.RemoveConditionTabCompleter;
@@ -113,7 +114,7 @@ public final class PaidSigns extends JavaPlugin {
         PluginCommand listCommand = this.getCommand("listPaidSigns");
         if (listCommand != null) {
             listCommand.setExecutor(new ListCommand());
-            //TODO: Add tab completer
+            listCommand.setTabCompleter(new ListTabCompleter());
         }
 
         PluginCommand addConditionCommand = this.getCommand("addPaidSignCondition");

src/main/java/net/knarcraft/paidsigns/command/AddCommand.java

@@ -25,7 +25,6 @@ public class AddCommand extends TokenizedCommand {
         if (args.length < 3) {
             return false;
         }
-        PaidSignManager manager = PaidSigns.getInstance().getSignManager();
 
         String signName = arguments.get(0);
         double cost;
@@ -45,6 +44,23 @@ public class AddCommand extends TokenizedCommand {
             ignoreColor = OptionState.fromString(arguments.get(4));
         }
 
+        return createPaidSign(sender, signName, cost, permission, ignoreCase, ignoreColor);
+    }
+
+    /**
+     * Creates a new paid sign with the given user input
+     *
+     * @param sender      <p>The command sender that called the add command</p>
+     * @param signName    <p>The name of the new paid sign</p>
+     * @param cost        <p>The cost of the new paid sign</p>
+     * @param permission  <p>The permission required for creating the sign represented by the paid sign</p>
+     * @param ignoreCase  <p>Whether to ignore case for the paid sign's conditions</p>
+     * @param ignoreColor <p>Whether to ignore color for the paid sign's conditions</p>
+     * @return <p>True if the paid sign was successfully created and registered</p>
+     */
+    private boolean createPaidSign(CommandSender sender, String signName, double cost, String permission,
+                                   OptionState ignoreCase, OptionState ignoreColor) {
+        PaidSignManager manager = PaidSigns.getInstance().getSignManager();
         try {
             PaidSign sign = new PaidSign(signName, cost, permission, ignoreCase, ignoreColor);
             if (manager.getPaidSign(signName) != null) {

src/main/java/net/knarcraft/paidsigns/command/ListTabCompleter.java

@@ -0,0 +1,29 @@
+package net.knarcraft.paidsigns.command;
+
+import net.knarcraft.paidsigns.utility.TabCompleteHelper;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * The tab completer for the list paid signs command
+ */
+public class ListTabCompleter extends TokenizedTabCompleter {
+
+    @Nullable
+    @Override
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias,
+                                      @NotNull String[] args) {
+        if (argumentSize < 1) {
+            return TabCompleteHelper.getPaidSignNames();
+        } else if (argumentSize < 2) {
+            return TabCompleteHelper.getSignLines();
+        }
+        return new ArrayList<>();
+    }
+
+}

src/main/java/net/knarcraft/paidsigns/utility/TabCompleteHelper.java

@@ -8,7 +8,11 @@ import java.util.List;
 /**
  * A helper class for providing common tab complete options
  */
-public class TabCompleteHelper {
+public final class TabCompleteHelper {
+
+    private TabCompleteHelper() {
+
+    }
 
     /**
      * Gets the available boolean values for tab completion