Add fallback text for failed respond templates

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

action_respond.go

@@ -13,8 +13,11 @@ func init() {
 
 		msg, err := formatMessage(*r.Respond, m, ruleDef, nil)
 		if err != nil {
+			if r.RespondFallback == nil {
 				return errors.Wrap(err, "preparing response")
 			}
+			msg = *r.RespondFallback
+		}
 
 		return errors.Wrap(
 			c.WriteMessage(&irc.Message{

config.go

@@ -183,6 +183,7 @@ type ruleAction struct {
 	Counter         *string        `json:"counter" yaml:"counter"`
 	DeleteMessage   *bool          `json:"delete_message" yaml:"delete_message"`
 	Respond         *string        `json:"respond" yaml:"respond"`
+	RespondFallback *string        `json:"respond_fallback" yaml:"respond_fallback"`
 	Timeout         *time.Duration `json:"timeout" yaml:"timeout"`
 }
 

wiki/Home.md

@@ -31,6 +31,7 @@ rules: # See below for examples
 
     # Send responding message to the channel the original message was received in
     - respond: 'Hello chatter'    # String, applies templating
+      respond_fallback: 'Oh noes' # String, text to send if the template function causes an error (default: unset)
 
     # Issue a timeout on the user who wrote the chat-line
     - timeout: 1s # Duration value: 1s / 1m / 1h