Start whining about ProtocolLib

src/main/java/me/libraryaddict/disguise/LibsDisguises.java

@@ -1,5 +1,7 @@
 package me.libraryaddict.disguise;
 
+import com.comphenix.protocol.ProtocolLib;
+import com.comphenix.protocol.ProtocolLibrary;
 import lombok.Getter;
 import me.libraryaddict.disguise.commands.LibsDisguisesCommand;
 import me.libraryaddict.disguise.commands.disguise.DisguiseCommand;
@@ -78,6 +80,17 @@ public class LibsDisguises extends JavaPlugin {
                     "reloads gracefully!");
         }
 
+        String version = ProtocolLibrary.getPlugin().getDescription().getVersion();
+
+        String requiredProtocolLib = "4.5.1";
+
+        if (DisguiseUtilities.isOlderThan(requiredProtocolLib, version)) {
+            getLogger().severe("!! Attention please !!");
+            getLogger().severe("Update your ProtocolLib! You are running " + version +
+                    " but the minimum version you should be on is " + requiredProtocolLib + "!");
+            getLogger().severe("!! Attention please !!");
+        }
+
         try {
             Class cl = Class.forName("org.bukkit.Server$Spigot");
         }

src/main/java/me/libraryaddict/disguise/utilities/DisguiseUtilities.java

@@ -2065,6 +2065,35 @@ public class DisguiseUtilities {
         }
     }
 
+    public static int[] getNumericVersion(String version) {
+        int[] v = new int[0];
+        for (String split : version.split("\\.-")) {
+            if (!split.matches("[0-9]+")) {
+                return v;
+            }
+
+            v = Arrays.copyOf(v, v.length + 1);
+            v[v.length - 1] = Integer.parseInt(split);
+        }
+
+        return v;
+    }
+
+    public static boolean isOlderThan(String requiredVersion, String theirVersion) {
+        int[] ourVersion = getNumericVersion(requiredVersion);
+        int[] theirs = getNumericVersion(theirVersion);
+
+        for (int i = 0; i < Math.min(ourVersion.length, theirs.length); i++) {
+            if (ourVersion[i] <= theirs[i]) {
+                continue;
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+
     public static Logger getLogger() {
         return LibsDisguises.getInstance().getLogger();
     }