Implemented %server_variant%

Author: darbyjack

pom.xml

@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.extendedclip.papi.expansion.server</groupId>
   <artifactId>server-expansion</artifactId>
-  <version>2.4.0</version>
+  <version>2.5.0</version>
   <name>PAPI-Expansion-Server</name>
   <description>PlaceholderAPI expansion for server placeholders</description>
 
@@ -21,7 +21,7 @@
         <dependency>
             <groupId>org.spigotmc</groupId>
             <artifactId>spigot-api</artifactId>
-            <version>1.16.3-R0.1-SNAPSHOT</version>
+            <version>1.16.4-R0.1-SNAPSHOT</version>
             <scope>provided</scope>
         </dependency>
         <dependency>

src/main/java/com/extendedclip/papi/expansion/server/ServerExpansion.java

@@ -54,6 +54,7 @@ public class ServerExpansion extends PlaceholderExpansion implements Cacheable,
 	private String low = "&c";
 	private String medium = "&e";
 	private String high = "&a";
+	private String variant;
 
 	private final String VERSION = getClass().getPackage().getImplementationVersion();
 
@@ -62,6 +63,7 @@ public ServerExpansion() {
 			version = Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3];
 			craftServer = Class.forName("net.minecraft.server." + version + ".MinecraftServer").getMethod("getServer").invoke(null);
 			tps = craftServer.getClass().getField("recentTps");
+			variant = initializeVariant();
 		} catch (Exception e) {
 			e.printStackTrace();
 		}
@@ -99,6 +101,30 @@ public String getVersion() {
 		return VERSION;
 	}
 
+	public String initializeVariant() {
+		try {
+			Class.forName("net.pl3x.purpur.PurpurConfig");
+			return "Purpur";
+		} catch (ClassNotFoundException e) {
+			try {
+				Class.forName("com.tuinity.tuinity.config.TuinityConfig");
+				return "Tuinity";
+			} catch (ClassNotFoundException e1) {
+				try {
+					Class.forName("com.destroystokyo.paper.PaperConfig");
+					return "Paper";
+				} catch (ClassNotFoundException e2) {
+					try {
+						Class.forName("org.spigotmc.SpigotConfig");
+						return "Spigot";
+					} catch (ClassNotFoundException e3) {
+						return "Unknown";
+					}
+				}
+			}
+		}
+	}
+
 	@Override
 	public Map<String, Object> getDefaults() {
 		final Map<String, Object> defaults = new HashMap<>();
@@ -115,6 +141,8 @@ public String onRequest(OfflinePlayer p, String identifier) {
 		switch (identifier) {
 		case "name":
 			return serverName == null ? "" : serverName;
+		case "variant":
+			return variant;
 		case "tps":
 			return getTps(null);
 		case "online":