1 files changed, 52 insertions, 0 deletions
diff --git a/juick-commands/src/main/java/com/juick/command/ShowHelp.java b/juick-commands/src/main/java/com/juick/command/ShowHelp.java
new file mode 100644
index 00000000..78e01706
--- /dev/null
+++ b/juick-commands/src/main/java/com/juick/command/ShowHelp.java
@@ -0,0 +1,52 @@
+package com.juick.command;
+
+import com.juick.User;
+import com.juick.server.protocol.ProtocolListener;
+import lombok.Getter;
+import org.springframework.beans.BeansException;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.stereotype.Component;
+
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+import javax.annotation.PostConstruct;
+
+/**
+ * @author ma1uta
+ */
+@Component
+@Getter
+public class ShowHelp implements Command, ApplicationContextAware {
+
+    private static final Pattern PATTERN = Pattern.compile("^help$", Pattern.CASE_INSENSITIVE);
+
+    private ApplicationContext applicationContext;
+    private String help;
+
+    @PostConstruct
+    public void init() {
+        help = getApplicationContext().getBeansOfType(Command.class).values().stream().map(Command::help).sorted()
+            .collect(Collectors.joining("\n"));
+    }
+
+    @Override
+    public Pattern pattern() {
+        return PATTERN;
+    }
+
+    @Override
+    public String help() {
+        return "HELP - returns this help message.";
+    }
+
+    @Override
+    public String execute(User sender, ProtocolListener protocolListener, String command) {
+        return getHelp();
+    }
+
+    @Override
+    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
+        this.applicationContext = applicationContext;
+    }
+}