Add dicore3-command

1 files changed, 76 insertions, 0 deletions

diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/predef/HelpCommand.java b/dicore3/command/src/main/java/io/dico/dicore/command/predef/HelpCommand.java
new file mode 100644
index 0000000..cadf4ae
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/predef/HelpCommand.java
@@ -0,0 +1,76 @@
+package io.dico.dicore.command.predef;
+
+import io.dico.dicore.command.*;
+import io.dico.dicore.command.annotation.Range;
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.parameter.Parameter;
+import io.dico.dicore.command.parameter.type.NumberParameterType;
+import org.bukkit.command.CommandSender;
+
+/**
+ * The help command
+ */
+public class HelpCommand extends PredefinedCommand<HelpCommand> {
+    private static final Parameter<Integer, Range.Memory> pageParameter;
+    public static final HelpCommand INSTANCE;
+
+    private HelpCommand(boolean modifiable) {
+        super(modifiable);
+        getParameterList().addParameter(pageParameter);
+        getParameterList().setRequiredCount(0);
+        setDescription("Shows this help page");
+    }
+
+    @Override
+    protected HelpCommand newModifiableInstance() {
+        return new HelpCommand(true);
+    }
+
+    @Override
+    public String execute(CommandSender sender, ExecutionContext context) throws CommandException {
+        ICommandAddress target = context.getAddress();
+        if (context.getAddress().getCommand() == this) {
+            target = target.getParent();
+        }
+
+        context.getAddress().getChatController().sendHelpMessage(sender, context, target, context.<Integer>get("page") - 1);
+        return null;
+    }
+
+    public static void registerAsChild(ICommandAddress address) {
+        registerAsChild(address, "help");
+    }
+
+    public static void registerAsChild(ICommandAddress address, String main, String... aliases) {
+        ((ModifiableCommandAddress) address).addChild(new ChildCommandAddress(INSTANCE, main, aliases));
+    }
+
+    static {
+        pageParameter = new Parameter<>("page", "the page number",
+                new NumberParameterType<Integer>(Integer.TYPE) {
+                    @Override
+                    protected Integer parse(String input) throws NumberFormatException {
+                        return Integer.parseInt(input);
+                    }
+
+                    @Override
+                    protected Integer select(Number number) {
+                        return number.intValue();
+                    }
+
+                    @Override
+                    public Integer parseForContext(Parameter<Integer, Range.Memory> parameter, ExecutionContext context, ArgumentBuffer buffer) throws CommandException {
+                        if (context.getAddress().getCommand() == null || context.getAddress().getCommand().getClass() != HelpCommand.class) {
+                            // An address was executed with its help command as target
+                            buffer.next();
+                            return 1;
+                        }
+                        return parse(parameter, context.getSender(), buffer);
+                    }
+                },
+                new Range.Memory(1, Integer.MAX_VALUE, 1));
+
+        INSTANCE = new HelpCommand(false);
+    }
+
+}