From 3e0e994e86445e2e85c068234a15ddce5b51e01d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Denis=20Nu=C8=9Biu?= <denis.nutiu@gmail.com>
Date: Fri, 20 Oct 2017 18:20:11 +0300
Subject: [PATCH] Adding the help command

---
 server/server/commands.go | 16 ++++++++++++++--
 server/server/parser.go   | 12 ++++++++++++
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/server/server/commands.go b/server/server/commands.go
index 889177d..adcd341 100644
--- a/server/server/commands.go
+++ b/server/server/commands.go
@@ -22,7 +22,7 @@ func SendFile(c net.Conn, path string) (int, error) {
 	lastForwardSlash := strings.LastIndex(path, "/")
 	if lastForwardSlash != -1 {
 		// Eliminate the last forward slash i.e ../../asdas will become asdas
-		fileName = path[lastForwardSlash + 1:]
+		fileName = path[lastForwardSlash+1:]
 	} else {
 		fileName = path
 	}
@@ -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
+}
diff --git a/server/server/parser.go b/server/server/parser.go
index e6e3438..4454977 100644
--- a/server/server/parser.go
+++ b/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 {