add plugin

rules.go

@@ -0,0 +1,28 @@
+package rei
+
+import (
+	"strings"
+
+	tgba "github.com/go-telegram-bot-api/telegram-bot-api/v5"
+)
+
+// PrefixRule check if the message has the prefix and trim the prefix
+//
+// 检查消息前缀
+func PrefixRule(prefixes ...string) Rule {
+	return func(ctx *Ctx) bool {
+		msg, ok := ctx.Value.(*tgba.Message)
+		if !ok || msg.Text == "" { // 确保无空
+			return false
+		}
+		for _, prefix := range prefixes {
+			if strings.HasPrefix(msg.Text, prefix) {
+				ctx.State["prefix"] = prefix
+				arg := strings.TrimLeft(msg.Text[len(prefix):], " ")
+				ctx.State["args"] = arg
+				return true
+			}
+		}
+		return false
+	}
+}