Add (untested) MVdWPlaceholderAPI support

Bukkit/src/main/java/com/plotsquared/bukkit/placeholder/PAPIPlaceholders.java

@@ -0,0 +1,89 @@
+/*
+ *       _____  _       _    _____                                _
+ *      |  __ \| |     | |  / ____|                              | |
+ *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
+ *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
+ *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
+ *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
+ *                                    | |
+ *                                    |_|
+ *            PlotSquared plot management system for Minecraft
+ *                  Copyright (C) 2020 IntellectualSites
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.plotsquared.bukkit.placeholder;
+
+import com.plotsquared.core.PlotSquared;
+import com.plotsquared.core.player.PlotPlayer;
+import me.clip.placeholderapi.PlaceholderAPIPlugin;
+import me.clip.placeholderapi.expansion.PlaceholderExpansion;
+import org.bukkit.entity.Player;
+
+public class PAPIPlaceholders extends PlaceholderExpansion {
+
+    public PAPIPlaceholders() {
+    }
+
+    @Override public boolean persist() {
+        return true;
+    }
+
+    @Override public boolean canRegister() {
+        return true;
+    }
+
+    @Override public String getAuthor() {
+        return "IntellectualSites";
+    }
+
+    @Override public String getIdentifier() {
+        return "plotsquared";
+    }
+
+    @Override public String getVersion() {
+        return "3";
+    }
+
+    @Override public String onPlaceholderRequest(Player p, String identifier) {
+        final PlotPlayer<?> pl = PlotSquared.imp().getPlayerManager().getPlayerIfExists(p.getUniqueId());
+
+        if (pl == null) {
+            return "";
+        }
+
+        // PAPI specific ones that don't translate well over into other placeholder APIs
+        if (identifier.startsWith("has_plot_")) {
+            identifier = identifier.substring("has_plot_".length());
+            if (identifier.isEmpty())
+                return "";
+
+            return pl.getPlotCount(identifier) > 0 ?
+                PlaceholderAPIPlugin.booleanTrue() :
+                PlaceholderAPIPlugin.booleanFalse();
+        }
+
+        if (identifier.startsWith("plot_count_")) {
+            identifier = identifier.substring("plot_count_".length());
+            if (identifier.isEmpty())
+                return "";
+
+            return String.valueOf(pl.getPlotCount(identifier));
+        }
+
+        // PlotSquared placeholders
+        return PlotSquared.get().getPlaceholderRegistry().getPlaceholderValue(identifier, pl);
+    }
+
+}