Introduce ConsoleCommandSource. See #155

api/src/main/java/com/velocitypowered/api/proxy/ConsoleCommandSource.java

@@ -0,0 +1,9 @@
+package com.velocitypowered.api.proxy;
+
+import com.velocitypowered.api.command.CommandSource;
+
+/**
+ * Indicates that the executor of the command is the console.
+ */
+public interface ConsoleCommandSource extends CommandSource {
+}

api/src/main/java/com/velocitypowered/api/proxy/ProxyServer.java

@@ -99,7 +99,7 @@ public interface ProxyServer {
    *
    * @return the console command invoker
    */
-  CommandSource getConsoleCommandSource();
+  ConsoleCommandSource getConsoleCommandSource();
 
   /**
    * Gets the {@link PluginManager} instance.

proxy/src/main/java/com/velocitypowered/proxy/command/VelocityCommandManager.java

@@ -68,21 +68,29 @@ public class VelocityCommandManager implements CommandManager {
     return commands.containsKey(command);
   }
 
+  /**
+   * Offer suggestions to fill in the command.
+   * @param source the source for the command
+   * @param cmdLine the partially completed command
+   * @return a {@link List}, possibly empty
+   */
   public List<String> offerSuggestions(CommandSource source, String cmdLine) {
     Preconditions.checkNotNull(source, "source");
     Preconditions.checkNotNull(cmdLine, "cmdLine");
 
     String[] split = cmdLine.split(" ", -1);
     if (split.length == 0) {
+      // No command available.
       return ImmutableList.of();
     }
 
     String alias = split[0];
     if (split.length == 1) {
+      // Offer to fill in commands.
       List<String> availableCommands = new ArrayList<>();
       for (Map.Entry<String, Command> entry : commands.entrySet()) {
-        if (entry.getKey().regionMatches(true, 0, alias, 0, alias.length()) &&
-            entry.getValue().hasPermission(source, new String[0])) {
+        if (entry.getKey().regionMatches(true, 0, alias, 0, alias.length())
+            && entry.getValue().hasPermission(source, new String[0])) {
           availableCommands.add("/" + entry.getKey());
         }
       }
@@ -93,6 +101,7 @@ public class VelocityCommandManager implements CommandManager {
     String[] actualArgs = Arrays.copyOfRange(split, 1, split.length);
     Command command = commands.get(alias.toLowerCase(Locale.ENGLISH));
     if (command == null) {
+      // No such command, so we can't offer any tab complete suggestions.
       return ImmutableList.of();
     }
 

proxy/src/main/java/com/velocitypowered/proxy/console/VelocityConsole.java

@@ -1,9 +1,9 @@
 package com.velocitypowered.proxy.console;
 
-import com.velocitypowered.api.command.CommandSource;
 import com.velocitypowered.api.event.permission.PermissionsSetupEvent;
 import com.velocitypowered.api.permission.PermissionFunction;
 import com.velocitypowered.api.permission.Tristate;
+import com.velocitypowered.api.proxy.ConsoleCommandSource;
 import com.velocitypowered.proxy.VelocityServer;
 import java.util.List;
 import net.kyori.text.Component;
@@ -18,7 +18,7 @@ import org.jline.reader.Candidate;
 import org.jline.reader.LineReader;
 import org.jline.reader.LineReaderBuilder;
 
-public final class VelocityConsole extends SimpleTerminalConsole implements CommandSource {
+public final class VelocityConsole extends SimpleTerminalConsole implements ConsoleCommandSource {
 
   private static final Logger logger = LogManager.getLogger(VelocityConsole.class);