start implementing basic command handler

cmd/bot/command.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"strings"
+
+	"github.com/gempir/go-twitch-irc/v3"
+)
+
+func (app *application) handleCommand(message twitch.PrivateMessage) {
+	app.logger.Info("[COMMAND HANDLER]", message)
+
+	// commandName is the actual name of the command without the prefix.
+	// e.g. `()ping` would be `ping`.
+	commandName := strings.ToLower(strings.SplitN(message.Message, " ", 3)[0][2:])
+
+	// cmdParams are additional command parameters.
+	// e.g. `()weather san antonio`
+	// cmdParam[0] is `san` and cmdParam[1] = `antonio`.
+	//
+	// Since Twitch messages are at most 500 characters I use a
+	// maximum count of 500+10 just to be safe.
+	// https://discuss.dev.twitch.tv/t/missing-client-side-message-length-check/21316
+	cmdParams := strings.SplitN(message.Message, " ", 510)
+	_ = cmdParams
+
+	// msgLen is the amount of words in a message without the prefix.
+	// Useful to check if enough cmdParams are provided.
+	msgLen := len(strings.SplitN(message.Message, " ", -2))
+
+	// target is the channelname the message originated from and
+	// where we are responding.
+	target := message.Channel
+
+	switch commandName {
+	case "":
+		if msgLen == 1 {
+			app.twitchClient.Say(target, "xd")
+			return
+		}
+	}
+}

cmd/bot/privatemessage.go

@@ -16,7 +16,8 @@ func (app *application) handlePrivateMessage(message twitch.PrivateMessage) {
 	if len(message.Message) >= 2 {
 		if message.Message[:2] == "()" {
 			// TODO: Command Handling
-			app.logger.Infof("[Command detected]: ", message.Message)
+			app.handleCommand(message)
+			// app.logger.Infof("[Command detected]: ", message.Message)
 			return
 		}
 	}