#923 Add commands to run on unregister

src/main/java/fr/xephi/authme/settings/commandconfig/CommandConfig.java

@@ -13,6 +13,7 @@ public class CommandConfig {
     private Map<String, Command> onJoin = new LinkedHashMap<>();
     private Map<String, Command> onLogin = new LinkedHashMap<>();
     private Map<String, Command> onRegister = new LinkedHashMap<>();
+    private Map<String, Command> onUnregister = new LinkedHashMap<>();
 
     public Map<String, Command> getOnJoin() {
         return onJoin;
@@ -37,4 +38,12 @@ public class CommandConfig {
     public void setOnRegister(Map<String, Command> onRegister) {
         this.onRegister = onRegister;
     }
+
+    public Map<String, Command> getOnUnregister() {
+        return onUnregister;
+    }
+
+    public void setOnUnregister(Map<String, Command> onUnregister) {
+        this.onUnregister = onUnregister;
+    }
 }

src/main/java/fr/xephi/authme/settings/commandconfig/CommandManager.java

@@ -34,6 +34,7 @@ public class CommandManager implements Reloadable {
     private WrappedTagReplacer<Command, Player> onJoinCommands;
     private WrappedTagReplacer<Command, Player> onLoginCommands;
     private WrappedTagReplacer<Command, Player> onRegisterCommands;
+    private WrappedTagReplacer<Command, Player> onUnregisterCommands;
 
     @Inject
     CommandManager(@DataFolder File dataFolder, BukkitService bukkitService, GeoIpService geoIpService,
@@ -72,6 +73,15 @@ public class CommandManager implements Reloadable {
         executeCommands(player, onLoginCommands.getAdaptedItems(player));
     }
 
+    /**
+     * Runs the configured commands for when a player has been unregistered.
+     *
+     * @param player the player that has been unregistered
+     */
+    public void runCommandsOnUnregister(Player player) {
+        executeCommands(player, onUnregisterCommands.getAdaptedItems(player));
+    }
+
     private void executeCommands(Player player, List<Command> commands) {
         for (Command command : commands) {
             final String execution = command.getCommand();
@@ -94,6 +104,7 @@ public class CommandManager implements Reloadable {
         onJoinCommands = newReplacer(commandConfig.getOnJoin());
         onLoginCommands = newReplacer(commandConfig.getOnLogin());
         onRegisterCommands = newReplacer(commandConfig.getOnRegister());
+        onUnregisterCommands = newReplacer(commandConfig.getOnUnregister());
     }
 
     private WrappedTagReplacer<Command, Player> newReplacer(Map<String, Command> commands) {

src/main/java/fr/xephi/authme/settings/commandconfig/CommandMigrationService.java

@@ -30,13 +30,18 @@ class CommandMigrationService implements MigrationService {
         final CommandConfig commandConfig = CommandSettingsHolder.COMMANDS.getValue(resource);
         final boolean didMoveCommands = transformOldCommands(commandConfig);
 
-        if (didMoveCommands) { // TODO ConfigMe/#29: Check that loaded file isn't completely empty
+        if (didMoveCommands || isFileEmpty(resource)) {
             resource.setValue("", commandConfig);
             return true;
         }
         return false;
     }
 
+    private boolean isFileEmpty(PropertyResource resource) {
+        Object root = resource.getObject("");
+        return (root instanceof Map) && ((Map) root).isEmpty();
+    }
+
     /**
      * Adds command settings from their old location (in config.yml) to the given command configuration object.
      *

src/main/java/fr/xephi/authme/settings/commandconfig/CommandSettingsHolder.java

@@ -48,10 +48,13 @@ public final class CommandSettingsHolder implements SettingsHolder {
             "    command: 'broadcast %p has joined, welcome back!'",
             "    executor: CONSOLE",
             "",
-            "Supported command events: onLogin, onJoin, onRegister"
+            "Supported command events: onLogin, onJoin, onRegister, onUnregister"
         };
         Map<String, String[]> commentMap = new HashMap<>();
         commentMap.put("", comments);
+        commentMap.put("onUnregister", new String[]{
+            "Commands to run whenever a player is unregistered (by himself, or by an admin)"
+        });
         return commentMap;
     }