Feature nihongo (#339)

* ✨ 添加日语语法学习

* 🎨 添加err

plugin/nihongo/nihongo.go

@@ -0,0 +1,66 @@
+// Package nihongo 日语学习
+package nihongo
+
+import (
+	"time"
+
+	ctrl "github.com/FloatTech/zbpctrl"
+	"github.com/FloatTech/zbputils/binary"
+	"github.com/FloatTech/zbputils/control"
+	"github.com/FloatTech/zbputils/ctxext"
+	"github.com/FloatTech/zbputils/img/text"
+	log "github.com/sirupsen/logrus"
+	zero "github.com/wdvxdr1123/ZeroBot"
+	"github.com/wdvxdr1123/ZeroBot/message"
+)
+
+func init() {
+	engine := control.Register("nihongo", &ctrl.Options[*zero.Ctx]{
+		DisableOnDefault: false,
+		Help:             "日语学习\n- 日语语法[xxx](使用tag随机)",
+		PublicDataFolder: "Nihongo",
+	})
+
+	getdb := ctxext.DoOnceOnSuccess(func(ctx *zero.Ctx) bool {
+		db.DBPath = engine.DataFolder() + "nihongo.db"
+		_, err := engine.GetLazyData("nihongo.db", true)
+		if err != nil {
+			ctx.SendChain(message.Text("ERROR:", err))
+			return false
+		}
+		err = db.Open(time.Hour * 24)
+		if err != nil {
+			ctx.SendChain(message.Text("ERROR:", err))
+			return false
+		}
+		err = db.Create("grammar", &grammar{})
+		if err != nil {
+			ctx.SendChain(message.Text("ERROR:", err))
+			return false
+		}
+		n, err := db.Count("grammar")
+		if err != nil {
+			ctx.SendChain(message.Text("ERROR:", err))
+			return false
+		}
+		log.Infof("[nihongo]读取%d条语法", n)
+		return true
+	})
+
+	engine.OnRegex(`^日语语法\s?([0-9A-Za-z]{1,6})$`, getdb).SetBlock(true).
+		Handle(func(ctx *zero.Ctx) {
+			g := getRandomGrammarByTag(ctx.State["regex_matched"].([]string)[1])
+			if g.ID == 0 {
+				ctx.SendChain(message.Text("未能找到", ctx.State["regex_matched"].([]string)[1], "相关标签的语法"))
+				return
+			}
+			data, err := text.RenderToBase64(g.string(), text.FontFile, 400, 20)
+			if err != nil {
+				ctx.SendChain(message.Text("ERROR:", err))
+				return
+			}
+			if id := ctx.SendChain(message.Image("base64://" + binary.BytesToString(data))); id.ID() == 0 {
+				ctx.SendChain(message.Text("ERROR:可能被风控了"))
+			}
+		})
+}