feat: enhance help inform structure and update command descriptions across various handlers

handler/help/help.go

@@ -4,6 +4,7 @@ import (
 	"git.lxtend.com/qqbot/constants"
 	"git.lxtend.com/qqbot/handler"
 	"git.lxtend.com/qqbot/model"
+	"git.lxtend.com/qqbot/util"
 )
 
 func init() {
@@ -11,9 +12,19 @@ func init() {
 }
 
 func help(msg model.Message) (reply model.Reply) {
-	helpInfo := `以下是支持的功能：`
-	for k, v := range handler.HelpInforms {
-		helpInfo += "\n" + k + " : " + v
+	var helpInfo string
+	if len(util.SplitN(msg.RawMsg, 2)) == 1 {
+		helpInfo = `!help [分类] 查看下面的分类功能`
+		for k := range handler.HelpInforms {
+			helpInfo += "\n" + k
+		}
+	} else {
+		category := util.SplitN(msg.RawMsg, 2)[1]
+		helpInfos := handler.HelpInforms[category]
+		helpInfo = `以下是` + category + `的功能：`
+		for _, v := range helpInfos {
+			helpInfo += "\n" + v.Trigger + " : " + v.Inform
+		}
 	}
 	return model.Reply{
 		ReplyMsg:       helpInfo,