[Bleeding] Moved DefaultHelpTopic and GenericCommandHelpTopic to public bukkit api.

By: rmichela <deltahat@gmail.com>

paper-api/src/main/java/org/bukkit/help/GenericCommandHelpTopic.java

@@ -0,0 +1,75 @@
+package org.bukkit.help;
+
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.apache.commons.lang.StringUtils;
+import org.bukkit.command.ConsoleCommandSender;
+import org.bukkit.command.PluginCommand;
+import org.bukkit.command.defaults.VanillaCommand;
+import org.bukkit.help.HelpTopic;
+
+/**
+ * Lacking an alternative, the help system will create instances of GenericCommandHelpTopic for each command in the
+ * server's CommandMap. You can use this class as a base class for custom help topics, or as an example for how to
+ * write your own.
+ */
+public class GenericCommandHelpTopic extends HelpTopic {
+
+    private Command command;
+
+    public GenericCommandHelpTopic(Command command) {
+        this.command = command;
+
+        if (command.getLabel().startsWith("/")) {
+            name = command.getLabel();
+        } else {
+            name = "/" + command.getLabel();
+        }
+
+        // The short text is the first line of the description
+        int i = command.getDescription().indexOf("\n");
+        if (i > 1) {
+            shortText = command.getDescription().substring(0, i - 1);
+        } else {
+            shortText = command.getDescription();
+        }
+
+        // Build full text
+        StringBuffer sb = new StringBuffer();
+
+        sb.append(ChatColor.GOLD);
+        sb.append("Description: ");
+        sb.append(ChatColor.WHITE);
+        sb.append(command.getDescription());
+
+        sb.append("\n");
+
+        sb.append(ChatColor.GOLD);
+        sb.append("Usage: ");
+        sb.append(ChatColor.WHITE);
+        sb.append(command.getUsage().replace("<command>", name.substring(1)));
+
+        if (command.getAliases().size() > 0) {
+            sb.append("\n");
+            sb.append(ChatColor.GOLD);
+            sb.append("Aliases: ");
+            sb.append(ChatColor.WHITE);
+            sb.append(ChatColor.WHITE + StringUtils.join(command.getAliases(), ", "));
+        }
+        fullText = sb.toString();
+    }
+
+    public boolean canSee(CommandSender sender) {
+        if (!command.isRegistered() && !(command instanceof VanillaCommand)) {
+            // Unregistered commands should not show up in the help (ignore VanillaCommands)
+            return false;
+        }
+
+        if (sender instanceof ConsoleCommandSender) {
+            return true;
+        }
+
+        return command.testPermissionSilent(sender);
+    }
+}