add HandleCommand

pkg/commands/commands.go

@@ -1,14 +1,44 @@
 package commands
 
 import (
+	"strings"
+
 	"github.com/gempir/go-twitch-irc/v2"
 	log "github.com/sirupsen/logrus"
 )
 
+// HandleCommand receives a twitch.PrivateMessage from
+// HandlePrivateMessage where it found a command in it.
+// HandleCommand passes on the message to the specific
+// command handler for further action.
 func HandleCommand(message twitch.PrivateMessage, twitchClient *twitch.Client) {
 	log.Info("fn HandleCommand")
-	switch message.Message {
+
+	// commandName is the actual command name without the prefix.
+	commandName := strings.SplitN(message.Message, " ", 3)[0][2:]
+
+	// cmdParams are additional command inputs.
+	// example:
+	// weather san antonio
+	// is
+	// commandName cmdParams[0] cmdParams[1]
+	cmdParams := strings.SplitN(message.Message, " ", 500)
+
+	// msgLen is the amount of words in the message without the prefix.
+	// Useful for checking if enough cmdParams are given.
+	msgLen := len(strings.SplitN(message.Message, " ", -2))
+
+	switch commandName {
+	case "":
+		if msgLen == 1 {
+			twitchClient.Say(message.Channel, "Why yes, that's my prefix :)")
+		}
+		return
 	case "xd":
 		twitchClient.Say(message.Channel, "xd")
+		return
+	case "echo":
+		twitchClient.Say(message.Channel, cmdParams[1])
+		return
 	}
 }