Class VersionCommand

src/main/java/org/bukkit/command/defaults/VersionCommand.java:28–257

import org.jetbrains.annotations.NotNull;

public class VersionCommand extends BukkitCommand {
    public VersionCommand(@NotNull String name) {
        super(name);

        this.description = "Gets the version of this server including any plugins in use";
        this.usageMessage = "/version [plugin name]";
        this.setPermission("bukkit.command.version");
        this.setAliases(Arrays.asList("ver", "about"));
    }

    @Override
    public boolean execute(@NotNull CommandSender sender, @NotNull String currentAlias, @NotNull String[] args) {
        if (!testPermission(sender)) return true;

        if (args.length == 0) {
            sender.sendMessage("This server is running " + Bukkit.getName() + " version " + Bukkit.getVersion() + " (Implementing API version " + Bukkit.getBukkitVersion() + ")");
            //sendVersion(sender);
        } else {
            StringBuilder name = new StringBuilder();

            for (String arg : args) {
                if (name.length() > 0) {
                    name.append(' ');
                }

                name.append(arg);
            }

            String pluginName = name.toString();
            Plugin exactPlugin = Bukkit.getPluginManager().getPlugin(pluginName);
            if (exactPlugin != null) {
                describeToSender(exactPlugin, sender);
                return true;
            }

            boolean found = false;
            pluginName = pluginName.toLowerCase(java.util.Locale.ENGLISH);
            for (Plugin plugin : Bukkit.getPluginManager().getPlugins()) {
                if (plugin.getName().toLowerCase(java.util.Locale.ENGLISH).contains(pluginName)) {
                    describeToSender(plugin, sender);
                    found = true;
                }
            }

            if (!found) {
                sender.sendMessage("This server is not running any plugin by that name.");
                sender.sendMessage("Use /plugins to get a list of plugins.");
            }
        }
        return true;
    }

    private void describeToSender(@NotNull Plugin plugin, @NotNull CommandSender sender) {
        PluginDescriptionFile desc = plugin.getDescription();
        sender.sendMessage(ChatColor.GREEN + desc.getName() + ChatColor.WHITE + " version " + ChatColor.GREEN + desc.getVersion());

        if (desc.getDescription() != null) {
            sender.sendMessage(desc.getDescription());