refactor!: options approach for experiments

bot.go

@@ -30,21 +30,24 @@ type CwtchBot struct {
 	experiments []string
 }
 
-func NewCwtchBot(userdir string, peername string) *CwtchBot {
-	cb := new(CwtchBot)
-	cb.dir = userdir
-	cb.peername = peername
-	cb.engineHooks = connections.DefaultEngineHooks{}
-	cb.experiments = nil
-	return cb
+// CwtchBotOption modifies a new CwtchBot.
+type CwtchBotOption func(c *CwtchBot)
+
+// WithExperiments specifies the experiments option of a CwtchBot.
+func WithExperiments(experiments []string) CwtchBotOption {
+	return func(c *CwtchBot) {
+		c.experiments = experiments
+	}
 }
 
-func NewCwtchBotWithExperiments(userdir string, peername string, experiments []string) *CwtchBot {
+func NewCwtchBot(userdir, peername string, opts ...CwtchBotOption) *CwtchBot {
 	cb := new(CwtchBot)
 	cb.dir = userdir
 	cb.peername = peername
 	cb.engineHooks = connections.DefaultEngineHooks{}
-	cb.experiments = experiments
+	for _, optFunc := range opts {
+		optFunc(cb)
+	}
 	return cb
 }