[ban] Enable templating for ban reason

Signed-off-by: Knut Ahlers <knut@ahlers.me>

internal/actors/ban/actor.go

@@ -3,14 +3,19 @@ package ban
 import (
 	"strings"
 
-	"github.com/Luzifer/twitch-bot/plugins"
 	"github.com/go-irc/irc"
 	"github.com/pkg/errors"
+
+	"github.com/Luzifer/twitch-bot/plugins"
 )
 
 const actorName = "ban"
 
+var formatMessage plugins.MsgFormatter
+
 func Register(args plugins.RegistrationArguments) error {
+	formatMessage = args.FormatMessage
+
 	args.RegisterActor(actorName, func() plugins.Actor { return &actor{} })
 
 	args.RegisterActorDocumentation(plugins.ActionDocumentation{
@@ -25,7 +30,7 @@ func Register(args plugins.RegistrationArguments) error {
 				Key:             "reason",
 				Name:            "Reason",
 				Optional:        true,
-				SupportTemplate: false,
+				SupportTemplate: true,
 				Type:            plugins.ActionDocumentationFieldTypeString,
 			},
 		},
@@ -39,12 +44,17 @@ type actor struct{}
 func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData *plugins.FieldCollection, attrs *plugins.FieldCollection) (preventCooldown bool, err error) {
 	ptrStringEmpty := func(v string) *string { return &v }("")
 
+	reason, err := formatMessage(attrs.MustString("reason", ptrStringEmpty), m, r, eventData)
+	if err != nil {
+		return false, errors.Wrap(err, "executing reason template")
+	}
+
 	cmd := []string{
 		"/ban",
 		plugins.DeriveUser(m, eventData),
 	}
 
-	if reason := attrs.MustString("reason", ptrStringEmpty); reason != "" {
+	if reason != "" {
 		cmd = append(cmd, reason)
 	}