Adding the help command

server/server/commands.go

@@ -50,7 +50,6 @@ func SendFile(c net.Conn, path string) (int, error) {
 	return n, nil
 }
 
-
 // ListFiles list the files from path and sends them to the connection
 func ListFiles(c net.Conn) error {
 	files, err := ioutil.ReadDir(PATH)
@@ -71,3 +70,16 @@ func ListFiles(c net.Conn) error {
 
 	return nil
 }
+
+func ShowHelp(c net.Conn) error {
+	var helpText string = `
+The available commands are:
+get <filename> - Download the requested filename.
+ls - List the files in the current directory.
+clear - Clear the screen.
+exit - Close the connection with the server.
+`
+	_, err := c.Write([]byte(helpText))
+
+	return err
+}

server/server/parser.go

@@ -58,7 +58,19 @@ func ProcessInput(c net.Conn, text string) error {
 		// Ansi clear: 1b 5b 48 1b 5b 4a
 		// clear | hexdump -C
 		var b []byte = []byte{0x1b, 0x5b, 0x48, 0x1b, 0x5b, 0x4a}
+
 		c.Write(b)
+	case "help":
+		// Check arguments
+		err := checkArgumentsLength(commandsLen, 1)
+		if err != nil {
+			return &InputError{commands[0], err}
+		}
+
+		err = ShowHelp(c)
+		if err != nil {
+			return &InputError{commands[0], err}
+		}
 	case "exit":
 		err := checkArgumentsLength(commandsLen, 1)
 		if err != nil {