Merge pull request 'Add better AlertCommand' (#233) from BetterAlert into master

Reviewed-on: SteamWar/BungeeCore#233
Reviewed-by: Lixfel <lixfel@steamwar.de>

src/de/steamwar/bungeecore/commands/AlertCommand.java

@@ -37,8 +37,33 @@ public class AlertCommand extends BasicCommand {
             return;
         }
 
-        String s = String.join(" ", args);
+        String s;
+        boolean discordAnnounce = false;
+        if (args[0].equals("-discord")) {
+            if (args.length == 1) {
+                Message.send("USAGE_ALERT", sender);
+                return;
+            }
+            discordAnnounce = true;
+            s = join(1, args);
+        } else {
+            s = join(0, args);
+        }
+
         Message.broadcast("ALERT", ChatColor.translateAlternateColorCodes('&', s));
+        if (discordAnnounce) {
             SteamwarDiscordBot.instance().getAnnouncementListener().announce(s);
         }
+    }
+
+    private String join(int startIndex, String... strings) {
+        StringBuilder st = new StringBuilder();
+        for (int i = startIndex; i < strings.length; i++) {
+            if (i != startIndex) {
+                st.append(" ");
+            }
+            st.append(strings[i]);
+        }
+        return st.toString();
+    }
 }